2024-03-28T11:43:07Z
https://journal.uii.ac.id/Eksakta/oai
oai:ojs.jurnal.uii.ac.id:article/2391
2018-06-21T20:34:51Z
Eksakta:ART
Characterization And Composition Liquid Smoke-charcoal-compost Bamboo Sawdust As Natural Pesticide
Wijaya M, Mohammad
The research goal is to produce liquid smoke through pyrolisis process and to get fractions of potential chemical components from bamboo wastes. Results of this research are expected to give benefits as follows: (1) Liquid smoke produced from wood and bamboo waste through pyrolisis process is able to diversify preservative products, (2) Rate reaction from value rate constanta by pyrolitic kinetic model resulted from this process can be used to find expected compounds in large quantities. Results of pyrolisis bamboo dust have the highest yield of liquid smokes as much as 18.18% in pyrolitic temperature of 200 C. The highest acid content of results of pyrolisis of bamboo dust with electrical reactor resulted at pyrolitic temperature of 400 C was 7,89%, whereas, in pyrolisis result of bamboo dust with electrical reactor was shown ar pyrolitic temperature of 500 C. In terms of the charcoal produced from pyrolisis process containing the highest yield was bamboo dust (33,28%). Identification of GC-MS of bamboo dust could provide compounds that mostly derived from acid group and was dominated by aceton, acetic acid, 3 hidroksi 2 butanone, icocyanat acid and n butana. Change kinetic model of bamboo wastes is energy activasi bamboo. The technology of integrated bamboo vinegar-charcoal-compost production hence deserved its dissemination throughout Indonesia, as pesticide natural.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
text/plain
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2391
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 11, ISSUE 2, August 2010
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2391/2188
https://journal.uii.ac.id/Eksakta/article/view/2391/2308
oai:ojs.jurnal.uii.ac.id:article/2392
2018-06-21T20:34:51Z
Eksakta:ART
Analisis Perubahan Kawasan Mangrove Berdasarkan Interpretasi Data Spasial Di Tn. Sembilang, Pantai Timur Sumatera, Banyuasin, Sumsel
Hastiana, Yetty
Sjarkowi, Fachrurrozie
Anugrah, Dwi
Ridho, Rasjid
Due to the importance of mangrove ecosystem role to coastal area stability, study and research on mangrove ecosystem is interesting. Several study forms can be performed including by sightseeing and predicting degradation and change of mangrove conservation area during certain time. Result of prediction and analysis can be used by decision maker to state the priority of area protection. As intial step in management analysis for mangrove area ecosystem in Pasut area , TN. Sembilang Pantai Timur Sumatera, Banyuasin, SumSel,interpretation and identification can be performed during six years since it was stated as National park in 2003. Several techniques can be used for analyzing the ecosystem changes, one of these is by using remote sensing. In this research, remote sensing approach by landsat profile data from 2003 and 2009. The use of landsat data sequentially was aimed to interpret and identify changes in mangrove area during the time. Result of research showed that during six years there was changes and degradation mangrove ecosystem to be non mangrove of 14,57 %. This analysis hopely can be used as reference to apply wisdom and strategy of coastal area management . Analysis and strategic approach is become part of area optimation to reduce environmental pressures including biodiversity protection, coastal area protection also small islands from global climate change effect.Keywords: Spatial Analysis, Mangrove Ecosystem, Remote Sensing, TN. Sembilang SumSel.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2392
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 11, ISSUE 2, August 2010
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2392/2307
oai:ojs.jurnal.uii.ac.id:article/2393
2018-06-21T20:34:51Z
Eksakta:ART
Identifikasi dan Estimasi Runtun Waktu Model AR Menggunakan Algoritma Simulated Annealing
Taram, Abdul
suparman, suparman
When fitting a Autoregressive (AR) model to real data, the correct model order and the model parameter often unknown. Our aim is to find estimators of the order and the parameter based on the data. In this paper the model identification and parameter estimation for AR model is posed within a Bayesian framework. Within this framework the unknown order and parameter are assumed to be distributed according to a prior distribution, which incorporates all the available information about the process. All the information concerning the order andparameter characterising the model is then contained in the posterior distribution. Obtaining the posterior model order probabilities and the posterior model parameter probabilitiesrequires integration of the resulting posterior distribution, an operation which is analytically intractable. Here stochastic simulated annealing algorithm is developed to perform therequired integration by simulating from the posterior distribution. The methods developed are evaluated in simulation studies on number of synthetic and real data sets.Keywords : simulated annealing, autoregressive, order identification, parameter estimation.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2393
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 11, ISSUE 2, August 2010
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2393/2309
oai:ojs.jurnal.uii.ac.id:article/2429
2018-06-21T20:32:38Z
Eksakta:ART
Adsorption Competition between H+ and Cd2+ Ions Toward Active Sites on Ionic Imprinted Mercapto-Silica Hybrid
Buhani, Buhani
Adsorption process on Cd2+ionic imprinted mercapto-silica hybrid material (Cd(II)-IIP HMS) has been carried out with studying an adsorption competition between ion H+ and Cd2+ ion upon active sites of Cd(II)-IIP HMS material. Characterization of surface material was based on specific surface area, total volume, and porous diameter. Cd(II)-IIP HMS material with template ionic concentration of each 0.107; 0.214; 0.429; 0.658 mmol g-1 shows that adsorption model is relatively similar, the higher of H+ ion competed, the lower of adsorption capacity of Cd(II)-IIP HMS material upon Cd2+ ion. Keywords: adsorption, active site, mercapto-silica hybrid, ionic imprinted
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-15
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2429
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 1, February 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2429/2222
https://journal.uii.ac.id/Eksakta/article/view/2429/2226
oai:ojs.jurnal.uii.ac.id:article/2433
2018-06-21T20:32:38Z
Eksakta:ART
Effect Of Curcumin And Honey To Pharmacokinetics Of Paracetamol In Male Wistar Rats
Pradana, Dimas Adhi
Hayati, Farida
Samudra, Agung Giri
Kartika, Amalinda Setya
Honey and curcumin is widely consumed by children as food supplements. Honey is useful as an antioxidant and antibacterial, while curcumin is useful as an antioxidant, antiinflammatory, antibacterial, antiviral. Both health supplements are not infrequently used in conjunction with drugs, especially paracetamol. This study aims to determine the effect of curcumin and honey on the pharmacokinetic parameters of paracetamol in male rats. In this study, test animals were divided into 3 groups: control, treatment I and treatment II. In the control group mice were given paracetamol 150mg / KgBW, treatment group I rats were given curcumin 18 mg / KgBW, 1 hour and then given paracetamol 150mg / KgBW whereas the treatment group II rats given a dose of honey 7.65 mL / KgBW along with giving paracetamol 150mg KgBB . The results showed that administration of curcumin on the pharmacokinetics of paracetamol in mice can decrease the primary parameters of the elimination phase of CLT for 68.25%, increasing the secondary parameter t 1 / 2 at 193.72%, thus increasing the derivative parameters AUC0-inf for 88.36%, and MRT of 155.17% (p
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-15
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2433
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 1, February 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2433/2225
oai:ojs.jurnal.uii.ac.id:article/2435
2018-06-21T20:31:58Z
Eksakta:ART
Chemical Stability of Cd(II) and Cu(II) Ionic Imprinted Amino-Silica Hybrid Material in Solution Media
Buhani, Buhani
Chemical stability of Cd(II) and Cu(II) ionic imprinted amino-silica (HAS) material of (i-Cd-HAS and i-Cu-HAS) derived from silica modification with active compound (3-aminopropyl)-trimethoxysilane (3-APTMS) has been studied in solution media. Stability test was performed with HNO3 0.1 M (pH 1.35) to investigate material stability at low pH condition, acetat buffer at pH 5.22 for adsorption process optimum pH condition, and in the water (pH 9.34) for base condition. Material characteristics were carried out with infrared spectrophotometer (IR) and atomic absorption spectrophotometer (AAS). At interaction time of 4 days in acid and neutral condition, i-Cd-HAS is more stable than i-Cu-HAS with % Si left in material 95.89 % (acid media), 43.82 % (close to neutral), and 9.39 % (base media).Keywords: chemical stability, amino-silica hybrid, ionic imprinting technique.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-15
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://journal.uii.ac.id/Eksakta/article/view/2435
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 13, ISSUE 1, February 2012
2720-9326
2716-0459
oai:ojs.jurnal.uii.ac.id:article/2436
2018-06-21T20:32:38Z
Eksakta:ART
Parameter Estimation in Probit Model for Multivariate Multinomial Response Using SMLE
Nugraha, Jaka
In the research field of transportation, market research and politics, often involving the response of the multinomial multivariate observations. In this paper, we discused a modeling of multivariate multinomial responses using probit model. The estimated parameters were calculated using Maximum Likelihood Estimations (MLE) based on the GHK simulation. method known as Simulated Maximum Likelihood Estimations (SMLE). Likelihood function on the Probit model contains probability values that must be resolved by simulation. By using the GHK simulation algorithm, the estimator equation has been obtained for the parameters in the model Probit Keywords : Probit Model, Newton-Raphson Iteration, GHK simulator, MLE, simulated log-likelihood
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-15
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2436
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 1, February 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2436/2227
oai:ojs.jurnal.uii.ac.id:article/2437
2018-06-21T20:32:38Z
Eksakta:ART
Penentuan Efisiensi Immobilisasi Kromium (VI) Pada Geopolimer Abu Sekam Padi Dengan Uji TCLP (Toxicity Characteristic Leaching Procedure)
Budiasih, Kun Sri
This research aimed to determine the efficiency of immobilization of Cr(VI) on the rice husk ash based geopolymer with a TCLP (Toxicity Characteristic Leaching Procedure) study. The TCLP was refer to the standard method from Japan Environmental Agency. There were three variables used i.e., concentration of Cr(VI) impregnated, particles size, and the kind of leaching water. Determination of immobilization efficiency was done by calculate the concentration of Cr(VI) in the leachate water after the leaching processes. Quantitative measurement of the chromium was done by Uv-Vis spectrometer with biphenyl carbazid reagent. Immobilization of Cr(VI) on the rice husk ash based geopolymer was establish until 25 ppm Cr impregnated. The efficiency of the immobilization can reach 90% - almost 100% depend on the variable of leaching processes. Keywords: eficiency, immobilization, geopolimer, rice husk ash, TCLP study
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-15
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2437
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 1, February 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2437/2228
oai:ojs.jurnal.uii.ac.id:article/2438
2018-06-21T20:32:38Z
Eksakta:ART
Synthesis of 4 Phenyl 3,4 Dihydr Indeno[2′,1′]Pyrimidine 2 One on Different Amount of Catalysts
Ritmaleni, Ritmaleni
Parmasari, Megawati
Dihydropirimidine is a heterocyclic compound which has important pharmacologic and therapeutic activities. This compound can be synthesised by using Biginelli reaction which involve three type of starting materials and also have been developed into different method of reaction condition and starting material. LR1 (4phenyl3,4dihydroindeno[2′,1′]pyrimidine2one) is a derivative of dihydropirimidine. This research was aimed to study the effect of catalyst amount in the synthesis of LR1 in order to reach the optimal yield. LR1 can be synthesised form benzaldehyde, urea adn 2indanone in ethanol and concentrated chloric acid as catalyst for five hours under reflux. The product mixture was then extracted and isolated by column chromatography preparative. The melting point was checked to determine the purity of the product. The structure elucidation was carried out by using spectroscopic method (uvvis, IR, 1HNMR and MS) The result showed that the highest yield of LR1 was obtained around 15 % when 0.25 % of chloric acid used as catalyst. The higher the condition of acid in the reaction, the lower the tield of LR1 obtained.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-15
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2438
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 1, February 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2438/2229
oai:ojs.jurnal.uii.ac.id:article/2439
2018-06-21T20:32:38Z
Eksakta:ART
Screening of Secondary Metabolites Compounds in Stem Bark of Frangipangi (Plumeria alba) and Toxicity Test on Shrimp Larvae (Brine Shrimp Lethality Test)
Handayani, Santi Nur
Chasani, Moch.
Frangipani is a plant belonging to the family Apocynacea and potential for development as anti-cancer drug material. Content of secondary metabolites, anti-cancer compounds from frangipani (Plumeria alba) steam bark, especially it has not been made. This research aims to identify compounds secondary metabolites from frangipani steam bark extract potential for development as anti-cancer drug material. Steps undertaken in this study include: Extraction of secondary metabolites with frangipani stem bark maceration method of storey with n-hexane, chloroform, ethyl acetate, and ethanol. Each tested extracts obtained using prawn shrimp toxicity A. salina Leach and continued with the testing of secondary metabolites using color reagents. fraction extract has potential as an anti-cancer drugs is purified using gravity column chromatography technique with elusi gradient technique using a solvent mixture n-hexane:ethyl acetate hen conducted toxicity tests followed by identification using GC-MS Extraction results obtained by the four extracts namely: n-hexane extract (E1) is positive flavonoid groups, chloroform extract (E2), ethyl acetate extract (E3) and ethanol extract (E4) is positive for secondary metabolite groups flavonoid and alkaloid. Toxicity test results obtained LC50 values respectively participated: 973. 7 ppm (E1), 451.35 ppm (E2), 112.557 ppm(E3), and 637.50 ppm(E4). Keywords: Plumeria alba, secondary metabolite, toxicity test, and A. salina Leach
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-15
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2439
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 1, February 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2439/2230
oai:ojs.jurnal.uii.ac.id:article/2440
2018-06-21T20:32:38Z
Eksakta:ART
Prediction Using Distributed Lagged Subset Model
Suparman, Suparman
This article examines the problem of determining the future value of the dependent variable in the distributed lagged subset model. Unlike a distributed lag model in general, which assumes that all coefficients are not zero. In a distributed lagged subset model, some coefficients may be zero. The purpose of this study was to determine the predictive value of the dependent variable in a distributed lagged subset model. The approach used to estimate the parameters of a distributed lagged subset model is the least square method and Ck statistic. Least squares method is used to determine the estimators of the coefficient of a distributed lagged subset model. Ck Statistic is used to select the best distributed lagged subset model. Some simulations are delivered and prove the efficiency of this approach. Furthermore, this approach is implemented in real economic data. Keywords : Distributed lagged subset model, Prediction, Least square method, Ck Statistic.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-15
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2440
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 1, February 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2440/2231
oai:ojs.jurnal.uii.ac.id:article/2441
2018-06-21T20:32:38Z
Eksakta:ART
Evaluasi Unjuk Kerja Alat Spektrofotometer UV-Vis Menggunakan Holmium Oksida dan Kalium Dikromat
Huda, Thorikul
Rahmatillah, Cecep Sa'bana
Habibi, Yusuf
The Evaluation of Hitachi U 2010 UV-Vis Spectrophometer performance using holmium glass from Starna reference materials and potassium dichromate has been done. The aim of investigation with holmium glass was to known wavelength work region at ultra violet and visible area, potassium dichromate solution used to known photometric performance of UV-Vis spectrophotometer. The result of investigation used holmium glass showed wavelength peak at 241, 278, 287, 333, 360, 418, 445, 453, 459, 536 and 637 nm regions, wich it is similar with reference material. The determination of photometric resulted by absorbance value measurement at 235, 275, 313 and 350 nm were 0,746; 0,860; 0,294; 0,641 respectively. The result of wavelength and photometric investigation showed that Hitachi U 2010 spectrophotometer was proper to done and suitable with SR 03 KAN reference. Keywords: UV-Vis Spectrophometer, holmium glass, potassium dichromate, wavelength,
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-15
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2441
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 1, February 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2441/2232
oai:ojs.jurnal.uii.ac.id:article/2442
2018-06-21T20:32:38Z
Eksakta:ART
Studi Adsorpsi Larutan Gliserol Menggunakan Karbon Aktif: Efek Konsentrasi, Tegangan Permukaan Dan Temperatur
Hidayat, Yuniawan
Wibowo, Atmanto Heru
Ngandayani, Dwi
The effect of adsorbate concentration, surface tension and temperature on glycerol adsorption over activated carbon have been conducted. Activity of adsorbent was increased by soaking activated carbon in H2SO4 10% solution for 12 hours followed heating at a temperature of 500oC under N2 gas flow for 3 hours. Furthermore, the identification and characterization of activated carbon were done by infrared spectroscopy (IR) and gravimetric method acidity test. Conditions of adsorption of glycerol by activated carbon were carried out using batch method with ±12 hours of contact time on the variation of adsorbate concentration or the ratio glycerol : water (v/v) 1 : 2, 1 : 3, 1 : 4, and 1 : 5, as well as variations in 30, 40, 50, and 60 oC. The result showed that increased activity of activated carbon increased acidity from 0.5 mmol/gram to 2.7 mmol/gram. Increasing concentration of glycerol causes the surface tension decreases and (∂γ/∂C) becomes negative with means that glycerol was adsorbed over the surface. It has been confirmed by the increase of actvated carbon capacity is proportional to the increased concentration of glycerol. Temperature was also playing the role of glycerol adsorption where at 60 oC maximum adsorption was riched. Keywords: Adsorption, Glycerol, Adsorbate concentration, Temperature, Surface tension, Activated Carbon
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-15
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2442
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 1, February 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2442/2233
oai:ojs.jurnal.uii.ac.id:article/2520
2018-06-21T20:34:51Z
Eksakta:ART
Comparison on Isolation Technique of Vaninilin from Vanili Fruit (Vanilla planifolia Andrews
Haryadi, Winarto
Handayani, Sri
Arianingrum, Retno
Isolation of vanilin from vanili fruit by two method; maseration and Soxhlet using ethylacetate, ethanol and chloroform solvents has been investigated. Extraction result was hydrolized using sodium hydroxide by acidification using chloride acid. Filtrate was extracted by using chloroform and the targeted vanilin was separated by evaporation. Putrification was enganged by rechrystallization using aquadest-ethanol. Elucidation to the compound structure was performed by FTIR spectrophotometer, H-NMR, C-NMR, HMQC and HMBC. It is noted that vanilin isolation by soxhletazion procedure was more effective compared to maseration. Ethylacetate was more effective solvent than chloroform and conversely ethanol is inefective for the isolation. Keywords: vanilin isolation, soxhlet isolation, maseration
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2520
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 11, ISSUE 2, August 2010
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2520/2311
oai:ojs.jurnal.uii.ac.id:article/2521
2018-06-21T20:34:51Z
Eksakta:ART
Study of Quartz Activation, Effect of pH and Ion Fe2+ Concentration in Supporting Processes
Nugrahaningtyas, K.D.
Widjonarko, D.M.
Indriasari, I.Y.
Iron oxide supported in quartz had been done. This research were studied activation in quartz, effect of pH and ion Fe2+ concentration to the iron oxide formation in quartz and quartz itself. Activation were done using variation of activator concentration and time contact. The variation of activator concentration were 1 and 4M, and variation of the time contact were 15, 30, 60, 90 and 1440 minutes (24 hours). Quartz in optimum condition of activation was used for the supporting processes. Processes were conducted in ion exchange method. Supporting processes were done using variation of pH and ion Fe2+ concentration. The variation of pH were 5, 7 and 9, and variation of ion Fe2+ concentration were 0, 0,001, 0,005 and 0,01M. The sampels were analyzed using gravimetric and X-Ray Diffraction methods. The result showed that the acidity of quartz increased after activation comparing with quartz before activation. It means the activation sites formed in quartz. The activation reached optimum condition in activator concentration 1M and the time contact was 30 minutes. The result showed that supporting processes affected by pH and ion Fe2+ concentration. Iron oxide supported in pH 7 and 9, and maximum supported in concentration of ion Fe2+ 0,005M. Keywords: iron oxide, quartz, activation, supporting processes, pH, ion Fe2+ concentration
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2521
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 11, ISSUE 2, August 2010
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2521/2312
oai:ojs.jurnal.uii.ac.id:article/2522
2018-06-21T20:34:51Z
Eksakta:ART
Redox Reaction in the Cyclization-aromatization of (R)-(+)-Citronellal with FeCl3/Acetic Anhydride
Cahyono, Edy
Muchalal, Muchalal
Pranonowo, Harno Dwi
The effects of temperature, time of reaction, and the reactants mole ratio on the cyclization-acetylation of (R)-(+)-citronellal with FeCl3/acetic anhydride were studied. Isopulegyl acetate (IPA) and neoisopulegyl acetate (NIPA) were obtained as the main products at room temperature (mole ratio of citronellal: acetic anhydride: FeCl3 = 6:12:1). Both products are relatively fixed after the 30th minute. The average concentration of IPA at 30-180 minutes was 44.71%, while the average concentration of NIPA was 28.47%. Increasing temperature (80 oC) and the amount of acetic anhydride (mol ratio 2:6:1) gave p-cymene (17.53%) and citronellyl acetate (11.31%). Autoredoks reaction on the transformation of citronellal into p-cymene and citronellyl acetate was studied with the carbon oxidation number concept. Key words: (R )-(+)- citronellal, cyclization-aromatization, FeCl3, p-cymene, redox
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2522
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 11, ISSUE 2, August 2010
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2522/2313
oai:ojs.jurnal.uii.ac.id:article/2523
2018-06-21T20:34:51Z
Eksakta:ART
Isolation And Identification Of Antioxidant Compounds Leaf Betel Seating (Piper sarmentosum Roxb. Ex Hunter)
Diastutia, Hartiwi
Delsy, Eva Vaulina Yulistia
Sirih duduk or Piper sarmentosum Roxb. ex Hunter have been long used the people in Indonesia for traditional medicine to cure various diseases. This research was aimed to isolate and identify antioxidant compounds from P. sarmentosum leaves. The isolation bioactive compounds of P. sarmentosum leaves was performed by extraction the powder of P. sarmentosum leaves using methanol. The methanol extract was fractionated using n-hexane and ethylacetate in their various composition. The fractions respectively was examined their antioxidant activity. The most active extract was fractionated again performed by coloumn chromatography Identification of the bioactive compounds was carried out using ultraviolet-visible (UV-Vis) spectrometry, infra red (IR) spectrometry and gas chromatography-mass spectrometry (GCMS). The result showed that the methanol extract of P. sarmentosum leaves have antioxidant activity. The fractionation was performed by coloumn chromatography using n-hexane-ethylacetate (4:6) eluent, a bioactive compound of sinamic acid derivative was 4-ethoxy-2-hidroxy-3,5-dimethoxy sinamic acid could be purely isolated. Keywords: Piper sarmentosum, antioxidant, sinamic acid derivative.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2523
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 11, ISSUE 2, August 2010
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2523/2314
oai:ojs.jurnal.uii.ac.id:article/2524
2018-06-21T20:34:51Z
Eksakta:ART
Land Suitability Evaluation For Horticultural Commodities At The West Part Of Upland Lawu
Karyanto, Puguh
Rahayu, Rahayu
This research is about to examine the site-suitability of horticultural plantation at the west part of Lawu. The research was conducted through a survey upon the cultivated horticultural commodities by comparing their agronomic prerequisite with measured climatic conditions and land performances. The research shows that the most critical determinant for the performed horticultural cultivation is the slope of the landscape. Hence, horticultural cultivation activities must emphasize for not to ignore the importance of standing crop and slopeland’s management. Keywords: Land suitability evaluation. Horticultural commodities
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2524
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 11, ISSUE 2, August 2010
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2524/2315
oai:ojs.jurnal.uii.ac.id:article/2525
2018-06-21T20:34:51Z
Eksakta:ART
Antiangiogenic Effect Of The Chloroform Extract Of Tinospora crispa (L.) Miers Stem In The Chick Embryo Chorioallantoic Membrane (CAM) Induced By bFGF
Triastuti, Asih
Cancer is one of the most complex disease involving molecular process cause it is hard to be cured. There are many natural compounds which have been used empirically in the society in order to treat cancer. One of them is a kind of herbal medicine called ‘Brotowali’ (Tinospora crispa (L.) Miers). The objective of this research was to know antiangiogenic effect of the chloroform extract of brotowali stem using CAM method induced by bFGF. In this research, the inhibition test is done by the CAM at 9 day chick embryo divided into seven groups of treatment. Group I is as the paper disc controller, group II as the bFGF controller, group III as bFGF + DMSO 0,8% solvent controller, group IV, V, VI and VII, as the group that conduct the angiogenesis inhibition test. The last four group were given 10 ng of bFGF each and the chloroform extract of brotowali stem with the doses of 15 μg/ml, 60 μg/ml, 240 μg/ml and 960 μg/ml. After having been incubated for 3 days (egg at 12 day), CAM were carefully observed macroscopically and microscopically. The result showed that the chloroform extract of brotowali stem can inhibit the angiogenesis in CAM induced by bFGF. It show that the angiogenesis inhibition for the dose of the chloroform extract of brotowali stem were successively rise due to the dose increment, with angiogenic potency 31,87±9,01%, 43,12±8,01%, 53,44±2,70% and 62,81±4,74%. Keywords : cancer, angiogenesis, Tinospora crispa (L.) Miers, bFGF, CAM
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2525
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 11, ISSUE 2, August 2010
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2525/2316
oai:ojs.jurnal.uii.ac.id:article/2531
2022-03-30T09:11:58Z
Eksakta:ART
Optimasi dan evaluasi rutin ICP QMS untuk analisis multi-unsur
Fitri, Noor
Telah dilakukan optimasi dan evaluasi rutin alat Inductively Coupled Plasma Quadrupole Mass Spectrometer (ICP-QMS) untuk menganalisis multi unsur. Fokus optimasi adalah mendapatkan kondisi parameter yang memberikan intesitas sinyal optimum pada rentang analisis skala ppm hingga ppt. Evaluasi rutin bertujuan untuk mengetahui efektivitas optimasi harian dan bulanan alat ICP QMS agar mendapatkan kinerja alat yang unggul dengan akurasi dan presisi tinggi terutama untuk analisis multi-unsur dalam material biologis.Kata kunci: Optimasi, ICP QMS, multi-unsur
Fakultas Matematika dan Ilmu Pengetahuan Alam
2022-03-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2531
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 2, August 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2531/2318
oai:ojs.jurnal.uii.ac.id:article/2532
2018-06-21T20:32:43Z
Eksakta:ART
Pengaruh Pemberian Dosis Vitamin C Dan Waktu Pemeliharaan Terhadap Kematian Ikan Nila Menggunakan Regresi Logistik
Setiawan, Budi
Nugraha, Jaka
Penelitian ini dilaksanakan di Perikanan Kolam Jaring Apung JD-Cirata, Cianjur-Jawa Barat. Penelitian ini bertujuan untuk mengetahui pengaruh pemberian dosis vitamin C dan waktu pemeliharaan terhadap kematian ikan nila. Analisis statistik yang digunakan adalah analisis regresi logistik biner. Variabel respon adalah kematian ikan nila dan variabel penjelasnya adalah dosis vitamin C dan waktu pemeliharaan. Berdasarkan hasil analisis diperoleh kesimpulan bahwa pemberian dosis vitamin C dan waktu pemeliharaan berpengaruh terhadap kematian ikan nila. Probabilitas kematian ikan nila terkecil ketika pemberian dosis vitamin C 650 ml pada waktu pemeliharaan bulan ke-3, yaitu sebesar 0.0632 atau 6.32%. Semakin besar pemberian dosis vitamin C akan menekan kematian ikan, demikian juga semakin besar usia ikan maka peluang ikan akan hidup juga semakin besar.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2532
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 2, August 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2532/2319
oai:ojs.jurnal.uii.ac.id:article/2533
2018-06-21T20:32:43Z
Eksakta:ART
PEMURNIAN, IDENTIFIKASI DAN UJI AKTIVITAS ANTIDIABETES SENYAWA METABOLIT SEKUNDER EKSTRAK ETIL ASETAT DAUN KACA PIRING (Gardenia augusta, Merr)
Mochamad, Chasani
Diastuti, Hartiwi
Aprilia, Rizka
Gardenia augusta, Merr is one of the family Rubiaceae species used as traditional medicine because it has medicinal properties, such as drug diabetes mellitus. These research have been done on this plant, among others, is the ability of the extract and the active fraction ethyl acetate extract of Gardenia augusta, Merr leaves to lowering blood sugar levels of rats. The purpose of this research was to purification of the active fraction of the ethyl acetate extract and identify the secondary metabolites of Gardenia augusta, Merr leaves as well as test that can be used antidiabetic. Purification was done by column chromatography which was eluted with n-hexane: ethyl acetate (7:1) and obtained four groups of fractions. The fractions of the TLC to obtain pure isolates F2 fraction with melting point 158-160 ° C. The antidiabetic activity of the isolate F2 fractions were tested into white rats by glucose tolerance methods. Isolate F2 fraction was identified by using UV and IR spectrophotometer. The results showed that isolate F2 fraction of ethyl acetate extract of Gardenia augusta, Merr leaves has a hypoglycemic effect of 21.05%. The secondary metabolites test showed a positive result for steroids. Analysis using UV spectrophotometer showed the electronic transition n → л * and transition л → л *. Analysis using IR spectrophotometric showed functional groups OH, C = O, CO, aliphatic C-H, C = C, C-C, CH3 symmetric and C-H outside the field. Key word: Gardenia augusta, Merr, diabetes mellitus, steroids
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2533
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 2, August 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2533/2320
oai:ojs.jurnal.uii.ac.id:article/2534
2018-06-21T20:32:43Z
Eksakta:ART
Senyawa Aktif Antiinflamasi dari Kulit Batang Pasak Bumi (Eurycoma longifolia Jack)
Widiyantoro, Ari
Kusharyanti, Indri
Destiarti, Lia
Wardoyo, Elvi Rusmiyanto Pancaning
Pasak bumi (Eurycoma longifolia Jack) merupakan salah satu famili Simaroubaceae yang mengandung senyawa kimia dengan aktivitas biologik yang potensial.Penggunaannya di masyarakat selama ini hanya terbatas sebagai aprodisiaka, namun beberapa penelitian menunjukkan ditemukannya senyawa kimia dengan aktivitas sebagai antimalaria, antikanker dan antioksidan. Penelitian ini mengungkapkan adanya senyawa kimia yang bersifat antiinflamasi dengan tinjauan reduksi radang pada kaki tikus yang terinduksi karagenan. Hasil penelitian diperoleh suatu senyawa quassinoid yang bersifat antiinflamasi yaitu eurycomaosida, namun aktivitasnya lebih rendah dibanding indometasin sebagai kontrol positif. Kata Kunci : Eurycoma longifolia Jack, antiinflamasi, udema, karagenan, quassinoid
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2534
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 2, August 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2534/2321
oai:ojs.jurnal.uii.ac.id:article/2535
2018-06-21T20:32:43Z
Eksakta:ART
Pengaruh Variasi Berat Kitosan sebagai Katalis Basa Heterogen pada Reaksi Transesterifikasi Minyak Jelantah
Julianto, Tatang Shabur
Telah dilakukan penelitian tentang pengaruh berat variasi dari kitosan sebagai katalis basa heterogen pada reaksi transesterifikasi minyak jelantah. Proses transesterifikasi dilakukan dengan mereaksikan minyak jelantah dan metanol dengan variasi berat kitosan sebagai katalis yaitu sebanyak 1 g, 2 g, 3 g. Proses transesterifikasi dilakukan pada rasio mol minyak jelantah : metanol yaitu 1:9 dengan asumsi bahwa minyak jelantah didominasi oleh POO. Larutan direfluks pada temperatur 60°C dengan pengadukan yang dijaga konstan. Metil ester yang dihasilkan dianalisis menggunakan GC-MS. Penelitian ini menunjukkan bahwa reaksi transesterifikasi memberikan hasil optimal dengan rendemen 22,5 % (b/b) dengan menggunakan 1 g kitosan. Kata kunci :Transesterifikasi, minyak jelantah, kitosan, GC-MS.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2535
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 2, August 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2535/2322
oai:ojs.jurnal.uii.ac.id:article/2536
2018-06-21T20:32:43Z
Eksakta:ART
Preparation And Characterization Of Microporous Activated Carbon From Oil Palm Shell By Physical Activation Using Purified Nitrogen
Allwar, Allwar
Noor, Ahmad Md
Nawi, Moh Asri Moh
Oil palm shell, a byproduct of palm oil industry was successfully used as a raw material for the production of highly porous activated carbons. Preparation of activated carbon was carried out by physical activation under nitrogen at various activation temperatures. The nitrogen isotherms show Type I characteristics of microporous activated carbon. The maximum surface areas obtained at 900oC was 936 m2g-1. The morphology structure of the activated carbon indicated the existence of the porosities with different size pores. Keywords: Oil palm shell; Micropores; Physical activation; Nitrogen adsorption-desorption isotherm
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2536
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 2, August 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2536/2323
oai:ojs.jurnal.uii.ac.id:article/2537
2018-06-21T20:32:43Z
Eksakta:ART
Bentuk Normal Youla dari Matriks Kompleks the Youla Normal Form of Complexs Matrix
Hartini, Euis
Sebuah matriks kompleks berukuran n x n melalui transformasi unitary congruence dapat dibentuk matriks segitiga blok dengan diagonal blok berderajat 1 dan 2. Blok 1 x 1 berkaitan dengan nilai coneigen real nonnegatif, sedangkan blok 2 x 2 berkaitan dengan pasangan konjungat nilai coneigen kompleks. Matriks segitiga blok ini merupakan bentuk normal Youla dari matriks kompleks yang dapat berbentuk segitiga atas atau segitiga bawah. Kata-kata Kunci : Matriks kompleks, unitary congruence, dan nilai coneigen
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2537
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 2, August 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2537/2324
oai:ojs.jurnal.uii.ac.id:article/2538
2018-06-21T20:32:43Z
Eksakta:ART
Aktivitas Antimikroba Asam-3-Hidroksi-4-Metoksi Mandelat
Wibowo, Muhamad Agus
Arianie, Lucy
Telah dilakukan uji antimikroba senyawa asam-3-hidroksi-4-metoksi mandelat terhadap bakteri Escherichia coli dan Bacillus subtilis. Hasil uji pada bakteri Escherichia coli menunjukkan bahwa senyawa uji mampu menghambat pertumbuhan bakteri Escherichia coli dengan zona hambat 1,90 cm (30 ppm), 1,96 cm (100 ppm) dan bersifat bakteriostatik. Pada uji dengan bakteri Bacillus subtilis menunjukkan bahwa senyawa uji mampu menghambat pertumbuhan bakteri Bacillus subtilis dengan zona hambat sebesar 1,60 cm (30 ppm), 1,85 cm (100 ppm) dan bersifat bakteriosid. Kata kunci: asam-3-hidroksi-4-metoksi mandelat, aktivitas, antimikroba
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-02-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2538
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 12, ISSUE 2, August 2011
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2538/2325
oai:ojs.jurnal.uii.ac.id:article/2539
2018-06-21T20:35:33Z
Eksakta:ART
Segmentasi Bayesian Hirarki Untuk Model Ma Konstan Sepotong Demi Sepotong Berbasis Algoritma Reversible Jump Mcmc
Suparman, Suparman
This paper addresses the problem of the signal segmentation within a hierarchical Bayesian framework by using reversible jump MCMC sampling. The signal is modelled by piecewise constant MA processes where the numbers of segments, the position of abrupt, the order and the coefficients of the MA processes for each segment are unknown. The reversible jump MCMC algorithm is then used to generate samples distributed according to the joint posterior distribution of the unknown parameters. These samples allow to compute some interesting features of the a posterior distribution. Main advantage of the algorithm reversible jump MCMC algorithm is produce the joint estimators for the parameter and hyper parameter in hierarchical Bayesian. The performance of the this methodology is illustrated via several simulation results. Keywords : Hierarchical Bayesian model, Reversible Jump MCMC methods, Signal Segmentation, piecewise constant Moving-Average (MA) processes
Fakultas Matematika dan Ilmu Pengetahuan Alam
2012-03-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/2539
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 11, ISSUE 1, February 2010
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/2539/2326
oai:ojs.jurnal.uii.ac.id:article/4027
2018-06-21T20:31:05Z
Eksakta:ART
Chemical Stability of Cd(II) and Cu(II) Ionic Imprinted Amino-Silica Hybrid Material in Solution Media
Narsito, Nuryono, Eko Sri Kunarti, Buhani,
Chemical stability of Cd(II) and Cu(II) ionic imprinted hybrid material of (i-Cd-HAS and i-Cu-HAS) derived from silica modification with active compound (3-aminopropyl)-trimethoxysilane (3-APTMS) has been studied in solution media. Stability test was performed with HNO3 0.1 M (pH 1.35) to investigate material stability at low pH condition, CH3COONa 0.1 M (pH 5.22) for adsorption process optimum pH condition, and in the water (pH 9.34) for base condition. Material characteristics were carried out with infrared spectrophotometer (IR) and atomic absorption spectrophotometer (AAS). At interaction time of 4 days in acid and neutral condition, i-Cd-HAS is more stable than i-Cu-HAS with % Si left in material 95.89 % (acid media), 43.82 % (close to neutral), and 9.39 % (base media).Keywords: chemical stability, amino-silica hybrid, ionic imprinting technique
Fakultas Matematika dan Ilmu Pengetahuan Alam
2015-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4027
10.20885/eksakta.vol13.iss1-2.art1
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 13, ISSUE 1-2, August 2013; 1-10
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4027/3589
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4028
2018-06-21T20:31:05Z
Eksakta:ART
Kinetic study of Cr(VI) Adsorption on Hydrotalcite Mg/Al with Molar Ratio 2:1
Angga Kurniawan, Tri Esti Purbaningtias, Puji Kurniawati, Bayu Wiyantoko,
Chromium(VI) is one of the metals that is harmful to biota and humans if large amount present in environments. One method for reducing metal contamination of Cr(VI) inaqueous is by adsorption using Mg/Al hydrotalcite with molar ratio 2:1. This study is determined the effect of contact time and adsorption models of Cr(VI) adsorption on Mg/Al hydrotalcite with molar ratio 2:1. Capacity of Cr(VI) adsorption on Mg/Al hydrotalciteoccursat the optimum contact time of 180 minutes with 93.81% percent adsorption. Adsorption kinetics model equations are analyzed with first order, second order, pseudo first order, pseudo second order, Elovich equation, the equation Dumwald-Wagner and Weber-Morris equation. Analysis model of adsorption kinetics of Cr(VI) followed pseudo second order models are characterized by the highest coefficient of determination, which is 0.998.Keywords: adsorption, Mg/Al hydrotalcite, Cr(VI), adsorption kinetic models
Fakultas Matematika dan Ilmu Pengetahuan Alam
2015-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4028
10.20885/eksakta.vol13.iss1-2.art2
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 13, ISSUE 1-2, August 2013; 11-21
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4028/3590
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4029
2018-06-21T20:31:05Z
Eksakta:ART
Synthesis, Characterization and Aplication of TiO2 Alumina Pillared Montmorillonite Photocatalyst
Karna Wijaya, Iwan Sumarlan, Is Fatimah,
Dispersion of TiO2 on montmorillonite pillared aluminium has been done successfully. The photocatalyst were prepared by intercalation of Al13 onto natural montmorillonite and then calcined at 500oC. Titania dispersion onto aluminium pillared montmorillonite was carried out by impregnation method at the theoritic concentration of 0.4, 0.8, 1 and 3% titania. The photocatalyst then characterized by XRD, porosimetry, SEM and Diffuse Reflectance Visible methods. Results of characterization showed that the basal spacing and specific surface area as well as total pore volume were decreased after dispersion of TiO2 on PILM, meanwhile SEM image exhibited that beside in the pores of PILM, the TiO2 was also dispersed on the surface of PILM. DR UV characterization result indicated that the band gap of TiO2 dispersed PILM for Ti/PILM 0,8%, Ti/PILM 1% and Ti/PILM 3% was 3.66, 3.19 and 3.19 eV respectively. Photodegradation optimum of methyl orange was found to be at Ti/PILM 1%Keywords : montmorillonite, pillarization, photocatalyst, methyl orange, TiO2
Fakultas Matematika dan Ilmu Pengetahuan Alam
2013-08-10
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4029
10.20885/eksakta.vol13.iss1-2.art3
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 13, ISSUE 1-2, August 2013; 22-32
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4029/3591
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4030
2018-06-21T20:31:05Z
Eksakta:ART
Pengaruh Pola Agitasi pada Reaksi Transesterifikasi Minyak Jelantah Warung Pecel Lele Menggunakan Katalis Kitosan
Thorikul Huda, Tatang Shabur Juliantoa,
Effect of agitation on the transesterification reaction of waste cooking oil from pecel lele food stalls around UII campus using chitosan catalyst. Transesterification reaction was done by adding 46 grams of chitosan and 123 mL metanol tothe reactor. The mixture was stirred for 30 minutes to distribute methanol into chitosan. Furthermore,500 mL (460 grams) of cooking oil (= 0.916 g / mL) was add into reactor and agitated at 65oC within two hours using 30 rpm speed . Agitation was performed with several variations of the direction of stirring , one way stirring, stirring 2 ways round the turn at intervals of 5, 10 and 15 minutes. The results show that only 49,95% methyl ester yieldwas obtained (methyl palmitate, methyl-9-octadecenoate , methyl-3-oxooctadecanoate), produced by one directional rotation. Two ways agitation gives methyl ester results on average by 30.41 % . The number of methyl ester was decreased when treated with two way stirring well in intervals of 5 seconds (30.34 %) , 10 seconds (29.97 %) and 15 seconds (30.94 %). Methyl ester product was only sligtly, presumably because the raw material is very bad used cooking oil. It can be indicated from thehigh acid number 8.11 mg/L. and the number of chemical components in addition to triglycerides which may interfere with or hinder the contact between the reactants (chitosan , methanol and triglycerides).Keywords: used cooking oil, chitosan, agitation, transesterification, methyl ester
Fakultas Matematika dan Ilmu Pengetahuan Alam
2013-08-10
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4030
10.20885/eksakta.vol13.iss1-2.art4
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 13, ISSUE 1-2, August 2013; 33-39
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4030/3592
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4032
2018-06-21T20:31:05Z
Eksakta:ART
Analysis of Total Antioxidant Capacity on Ingredients of Lotek Menu by Ferric Reducing Antioxidant Power Assay
Istiningrum, Reni Banowati
Total Antioxidant Capacity (TAC) determination has been made in the vegetable component of lotek with Ferric Reducing Antioxidant Power (FRAP) methods. Samples was crushed and then extracted with water as a polar solvent and centrifuged. The residue was extracted again with acetone as a non-polar solvent. The extract is then reacted with FRAP reagent and the absorbance measured by UV-Vis spectrophotometer at 595 nm. TAC values expressed as mM/mL extract of vegetables component of lotek for the water extract of green beans, peanuts, bean sprouts, cabbage, cucumbers, tomatoes, and spinach respectively is 2,72; 6,79; 1,26; 0,89; 0,33; 1,86; 1,85 mM /mL extract, while the acetone extract is 1,42; 5,41; 0,44; 0,32; 0,25; 1,09; 0,93 mM/mL extract. The three largest contribution to the total TAC is a water extract of peanuts, acetone extract of peanut and water extract of green beans respectively is 25,56; 21,16 and 10,66%.Keywords: lotek, TAC, FRAP, spectrophotometer UV-Vis
Fakultas Matematika dan Ilmu Pengetahuan Alam
2013-08-10
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4032
10.20885/eksakta.vol13.iss1-2.art5
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 13, ISSUE 1-2, August 2013; 40-48
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4032/3598
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4033
2018-06-21T20:31:05Z
Eksakta:ART
Preparation of Chitin, Study of Physicochemical Properties and Biopesticide Activities
Rohyami, Yuli
Istiningrum, Reni Banowati
Chitin was preparated from shrimp shells by chemically method. Preparation was carried out by deproteination shrimp shells powder < 150 mesh with 1 - 2 M NaOH, demineralization followed by reaction with 1.0 M HCl and depigmentation with (1 : 2 : 4, v/v) of chloroform : methanol : water. Physicochemical properties of chitin was determined from characterization of infrared spectra, ash value, loss on drying and total of nitrogen. Biopesticide activities of chitin was done to pest Bemisia tabaci at guava leaves with various concentration from 0.5 to 2.0 % chitin on 3 % v/v acetic acid. This study indicated that concentration of NaOH on deproteination process effected to its physicochemicals properties. Effectivity of 2 M NaOH on deproteination reaction was higher than 1 M NaOH . The degree of chitin deacetylation from 2 M NaOH was 13.61% and had lower molar ratio of total nitrogen. The degree of deacetylation of chitin from 1 M NaOH had lower and had higher molar ratio of total nitrogen. Physicochemicals properties of chitin quite an impact on its ability to reduce pest Bemisia tabaci. Biopesticide activity assay showed that treatment for 2 days on average mortality rate of 13.83%. Deacetylation of chitin which has a higher degree have a greaterability biopesticide with a mortality rate of up to 38.24%. This study the effect of deproteination process to biopesticide activities of chitin.Key Words : chitin, degree of deacetilation, molar ratio, biopesticide, Bemisia tabaci
Fakultas Matematika dan Ilmu Pengetahuan Alam
2013-08-10
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4033
10.20885/eksakta.vol13.iss1-2.art6
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 13, ISSUE 1-2, August 2013; 49-55
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4033/3594
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4034
2018-06-21T20:31:05Z
Eksakta:ART
Physical-Mechanical Properties And Microstructure Of Breadfruit Starch Edible Films With Various Plasticizer
Marpongahtun, Cut Fatimah Zuhra
Breadfruit contains starch can be used as raw material of edible film. Research on preparation of edible films using various types of plasticizer (xylitol, sorbitol and PEG 400) has been done. The edible films were evaluated of physical-mechanical properties and microstructure. The results of this study indicate that the addition of plasticizer effect on the physical and mechanical characteristics, the edible film thickness, tensile strength and water vapor transmission rate greater using PEG 400 but percent elongation smaller than xylitol and sorbitol. Surface analysis of film was performed using Scanning Electron Microscopy (SEM) method.Keyword : Edible Film; Pati Sukun; Plasticizer; Silitol; Sorbitol ; PEG 400
Fakultas Matematika dan Ilmu Pengetahuan Alam
2013-08-10
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4034
10.20885/eksakta.vol13.iss1-2.art7
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 13, ISSUE 1-2, August 2013; 56-62
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4034/3595
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4037
2018-06-21T20:31:05Z
Eksakta:ART
Studi Simulasi Model Nested Logit dan Paired Combinatorial Logit pada Respon Multinomial
Nugraha, Jaka
Multinomial logit model (MNL) is based on independent irrelevant alternatives assumption. If there was a correlation, MNL would result bias estimator. Correlation among of choices could be accommodated by Nested logit Model (NL) and Paired Combinatorial Logit Model (PCL). This research discuss how NL and PCL model can be used for estimating parameters (regression coefficient and correlation) and comparing to MNL in discrete choice model. Correlation structure is tested nesting correlation and correlation overlap. Paramaters in the models are estimated using maximum likelihood method. Simulated data generated using software R.3.0.1. Based on simulations data with nested correlation, NL model more appropriate than do MNL. But on data with overlapping correlation, the maximum likelihood estimator is not unique.Keywords : Multinomial logit, Nested logit, Paired Combinatorial Logit, maximum likelihood
Fakultas Matematika dan Ilmu Pengetahuan Alam
2013-08-10
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4037
10.20885/eksakta.vol13.iss1-2.art8
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 13, ISSUE 1-2, August 2013; 63-71
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4037/3597
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4041
2018-06-21T20:31:05Z
Eksakta:ART
Uji Aktivitas Ekstrak Etanol Kulit Buah Apel ( Pyrus malus, L) Terhadap
Amal Fadho, Suparmia, Khusnul Khotimah
Apple (Pyrus malus, L) is a fruit having much uses for health containing phytochemical and flavonoid substances. One of the substances contained in apple rind is quercetin. Quercetin capable to reduce vascular permeability (Mochizuki et al., 2004). The recent study has an aim to know activity of ethanol extract on apple rind to the reducing of vascular permeability thus it can used as therapies for plasma leakage in curing Dengue Blood Fever. The vascular permeability test it was done an induction method using acetate acid. Testing done on white male mice of the BALB/c strain where the mice were divided into 5 groups. The first and second groups were control groups that are a positive control were given 0.2 mg/20 g standard quersetin suspension and the negative one was given 0.5% Na CMC suspension. The third, fourth and fifth groups were treatment groups where each testing animals were given ethanol extract suspension of apple rind by dosages 0.2, 0.4, and 0.8 mg/20 g of Body Weight mice per oral. Taking data was done by measuring pigment intensities from abdominal cavity liquid had been washed with acetate saline. From percentages of vascular permeability reducing each group then analyzed using statistic analyses those were the one-way anova. If there was found any significant difference then it was continued a Tukey test and bivariate-correlation. From results in the study it was known that percentages of vascular permeability reduces of ethanol extract that were made from apple rind having dosages 0.2, 0.4, and 0.8 mg in sequences as big as 42.15%, 63.28% and 84.19%.Keywords: Pyrus malus, L, kuersetin, vascular permeability
Fakultas Matematika dan Ilmu Pengetahuan Alam
2013-08-10
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4041
10.20885/eksakta.vol13.iss1-2.art9
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 13, ISSUE 1-2, August 2013; 72-83
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4041/3596
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4369
2018-06-21T20:28:54Z
Eksakta:ART
Synthesis of Mg/Al Hydrotalcite by Using Low Supersaturated Precipitation Method with Variation of Mole Ratio
Septyaningrum, Christanty Wahyu
Handayani, Sri
Kusumawardani, Cahyorini
Budiasih, Kun Sri
Mg/Al hydrotalcite
low supersaturated precipitation method
hydrothermal.
This research aims to synthesize Mg/Al hydrotalcite with mole ratio variations of Mg/Al precursor through low supersaturated precipitation method. Mg/Al hydrotalcite was synthesized with Mg/Al mole ratio variation of 1:1, 2:1, 3:1, and 4:1. Mg/Al hydrotalcite was synthesized using NaOH and Na2CO3 base solutions. The mixture of precursor was stirred for 2 hours then treated by hydrothermal at 100 °C for 4 hours. Results of the synthesis Mg/Al hydrotalcite with mole ratio variations is a white powder. The formation of the structure of Mg/Al hydrotalcite showed by certain peaks in the FTIR spectra and XRD diffractogram.The results of data analysisshowed that variation of mole ratio Mg/Alcauses a shift of peak in the XRD diffractogram shifted towards the left along with a comparative increase in mole ratio Mg/Al, but the main functional groups on the compound Mg/Al hydrotalcite increasingly formed with better.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2015-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4369
10.20885/eksakta.vol14.iss2.art1
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 14, ISSUE 2, August 2014; 1-5
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4369/3854
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4370
2018-06-21T20:28:54Z
Eksakta:ART
Community Structure of Riparian Community of Sematang Borang River of South Sumatera
Hastiana, Yetty
Kualitas sungai
Sungai Sematang Borang
Vegetasi Riparian
Vegetasi riparian adalah sebagai ekoton antara habitat teresterial dengan sistem perairan (sungai). Penyangga riparian berfungsi untuk menjaga kelestarian fungsi sungai dengan cara menahan atau menangkap tanah (lumpur) yang tererosi serta unsur hara dan bahan kimia termasuk pestisida yang terbawa dari lahan dibagian kiri kanan sungai agar tidak masuk ke perairan. Sungai Sematang Borang merupakan bagian dari Daerah Aliran Sungai (DAS) Musi, Sungai Sematang Borang memiliki karaketeristik struktur sungai dengan panjang seitar 5 km, lebar sungai mencapai 70 m dan kedalaman sekitar 10 m. Saat ini sungai ini mulai terancam mengalami penurunan kualitas baik fisik, kimia maupun biologi Selain kehilangan habitat alami ikan yang akan berdampak pada penurunan kelimpahan dan biodiversity, perairan ini juga mengalami abrasi pada sisi kiri kanan tebing sungai. Keberadaan vegetasi riparian menjadi penting, selain untuk mencegah abrasi, juga berperan dalam produksi serasah. Produksi serasah berkontribusi dalam transfer bahan organik vegetasi ke dalam tanah. Unsur hara yang dhasilkan dari proses dekomposisi serasah dalam tanah sangat penting bagi kelangsungan hidup vegetasi dan sebagai sumber detritus bagi ekosistem dalam menyokong kehidupan organisme akuatik. Pentingnya kontribusi vegetasi riparian dalam suatu ekosistem, maka perlu dilakukan penelitian terhadap diversitas dan profil vegetasi. Kajian aspek vegetasi, diperkuat dengan melakukan pengamatan terhadap kondisi fisik kimia perairan Sematang Borang. Parameter fisik kimiaperairan yang diamati meliputi: suhu, kedalaman, kecepatan arus, COD, BOD, DO, pH, dan Salinitas. Penelitian menerapkan metode ekologi deskriptif kuantitatif dan kualitatif, untuk analisis kualitas fisik kimia perairan didukung analisis laboratorium dan survei. Hasil penelitian teridentifikasi 15 species riparian dengan kategori indeks keanekaragaman riparian 0,09-1,03 dan memiliki pola penyebaran cenderung berkelompok. Merujuk pada kategori aspek hayati kawawasan perairan Sematang terancam tercemar. Kondisi fisik dan kimia perairan berupa parameter kecerahan, kadar COD dan DOberkorelasi kta terhadap nilai indeks keanekaragaman vegetasi riparian. Sementara suhu lingkungan, DO dan salinitas berkorelasi kuat terhadap pola penyebaran riparian.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2015-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4370
10.20885/eksakta.vol14.iss2.art2
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 14, ISSUE 2, August 2014; 6-21
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4370/3855
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4371
2018-06-21T20:28:54Z
Eksakta:ART
Determination of Lead in Waste Water Using Cyclic Voltammetry by Platinum Wire Electrode
Riyanto, Riyanto
lead
wastewater
cyclic voltammetry
platinum wire
Determination of lead in waste water using cyclic voltammetry by platinum wire electrode has been carried out. The cyclic voltammetry method was performed in a three electrodes system using platinum wire as a working electrode, an Ag/AgCl (saturated KCl) as reference electrode and platinum plate as the counter electrode. PGSTAT 100 N 100 V/250 mA type (Metrohm Autolab) was used for electroanalysis measurements. Electroanalysis of lead in waste water was performed in 0.1 M KClas an electrolyte. From this research showed that the developed electroanalysis lead in waste water using platinum wire electrode are accurate, precise, reproducible and inexpensive with acceptable correlation of determination (R2 = 0.999), LOD = 0.9029 mg/L , LOQ = 3.0098 mg/L and recovery = 100,67%. The methods can be used for the analysis of lead in waste water. This method is simplicity of sample preparation and use of low cost reagents are the additional benefit.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2015-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4371
10.20885/eksakta.vol14.iss2.art3
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 14, ISSUE 2, August 2014; 22-33
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4371/3856
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4372
2018-06-21T20:28:54Z
Eksakta:ART
Nori Nutrient Analysis from Seawed of Porphyra marcossi in Maluku Ocean
Loupatty, Voulda D
Porphyra marcossi
Perairan Maluku
Nori
Gizi
Penelitian “Analisis Gizi Nori Dari Rumput Laut Jenis Porphyra marcossi Yang Terdapat Di Perairan Maluku” dilakukan dengan tujuan menganalisis kualitas gizi nori yang dihasilkan dari rumput laut Porphyra marcossi, yang nantinya mampu menggantikan penggunaan nori impor untuk memenuhi kebutuhan dalam negeri. Adapun prosedur kerja proses pembuatan nori adalah rumput laut kering dicuci bersih, setelah bersih dilakukan pemotongan kecil-kecil / diblender. Selanjutnya direbus dengan perbandingan rumput laut:air=1:10 dengan penambahan sedikit cuka. Perebusan dilakukan selama ± 1 jam. Setelah itu dicetak berbentuk lembaran tipis, dikeringkan dan dikemas. Dalam penelitian ini dilakukan pengujian terhadap produk yang dihasilkan meliputi kadar protein, lemak, abu dan air, yang mengacu pada SNI 01-2891-1992, serta identifikasi asam amino dengan menggunakan metode hidrolisis asam basa. Hasil penelitian menunjukan bahwa rumput laut Porphyra marcossi mempunyai nilai gizi yang cukup tinggi yaitu : protein 28,60% ; lemak 0,83% ; abu 17,80% dan air 28,09%. Produk Nori mempunyai nilai gizi : protein 41,49% ; lemak 0,44% ;abu 4,99%;air 13,14%. Terdapat 10 jenis asam amino yaitu treonin, arginin, tirosin, meteonin, lisin, valin, asam glutamate, glisin, fenilalanin dan alanin. Teknologi pengolahan Nori cukup sederhana dan mudah dikembangkan dalam industry rumah tangga untuk meningkatkan pendapatan keluarga. Kebutuhan Nori dalam negeri dapat dipenuhi dengan adanya indutri pengolahan nori berbasis sumber daya alam lokal.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2015-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4372
10.20885/eksakta.vol14.iss2.art4
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 14, ISSUE 2, August 2014; 34-48
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4372/3857
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4373
2018-06-21T20:28:54Z
Eksakta:ART
Uji Aktivitas Ekstrak Etanol Kulit Buah Apel (Pyrus malus, L) Terhadap Penurunan Permeabilitas Vaskuler Pada Mencit Putih Jantan Strain Balb/C
Suparmi, Suparmi
Khotimah, Khusnul
Fadholi, Amal
Pyrus malus
L
kuersetin
permeabilitas vaskuler
Apel (Pyrus malus, L) merupakan buah yang memiliki banyak kegunaan dalam kesehatan, yang mengandung zat fitokimia dan flavonoid. Salah satu zat yang terkandung dalam kulit buah apel adalah kuersetin. Kuersetin yang terkandung didalam kulit apel diketahui mampu menurunkan permeabilitas vaskuler (Mochizuki, M., et al, 2004). Berdasarkan penelitian Mochizuki maka dilakukan penelitian yang bertujuan untuk mengetahui aktivitas ekstrak etanol kulit buah apel terhadap penurunan permeabilitas vaskular sehingga dapat digunakan sebagai terapi kebocoran plasma dalam pengobatan Demam Berdarah Dengue. Uji permeabilitas vaskuler dilakukan dengan menggunakan metode induksi asam asetat. Uji aktivitas ekstrak dilakukan pada mencit jantan putih strain BALB/c yang telah dibagi menjadi 5 kelompok. Kelompok pertama dan kedua adalah kelompok kontrol, kontrol positif diberi 50 EKSAKTA Volume 14 No. 2 suspensi kuersetin standar 0,2mg/20g dan kontrol negatif diberi suspensi Na CMC 0,5%. Kelompok ketiga, keempat, dan kelima adalah kelompok perlakuan . Pada kelompok ini, masing-masing hewan uji menerima suspensi ekstrak etanol kulit buah apel dengan dosis 0,2, 0,4 dan 0,8 mg/20g BB mencit per oral. Pengambilan data dilakukan dengan mengukur intensitas warna dari cairan rongga perut hewan uji yang telah dicuci dengan salin setelah terlebih dahulu diberikan sediaan uji, diinjeksi dengan larutan trypan blue, dan asam asetat. Hasil persentase penurunan permeabilitas vaskuler tiap kelompok dianalisa dengan analisis statistik anova satu arah dan dilanjutkan uji tukey dan korelasi-bivariat. Dari hasil penelitian, diketahui persentase penurunan permeabilitas vaskuler ekstrak etanol kulit buah apel dosis 0,2, 0,4 dan 0.8 mg berturut-turut sebesar 42,15%, 63,28%, dan 84,19%.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2015-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4373
10.20885/eksakta.vol14.iss2.art5
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 14, ISSUE 2, August 2014; 49-61
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4373/3858
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4374
2018-06-21T20:28:54Z
Eksakta:ART
Ethanol Concentration Effect of Mangoesten Pell Extract to Total Phenol Content
Ahda, Mustofa
Fenol total
Ekstraksi
Maserasi
Ekstrak
Asam Galat
Telah penelitian tentang pengaruh konsentrasi etanol terhadap kandungan fenol total pada kulit manggis. Penelitian ini bertujuan sebagai effisiensi penggunaan pelarut yang digunakan dalam proses ekstraksi. Proses ekstraksi yang digunakan dalam penelitian ini menggunakan teknik maserasi. Penelitian ini dengan melakukan variasi konsentrasi etanol 100%, 80%, 50%, 20%, 0% sebagai pelarut yang digunakan dalam proses maserasi selama 24 jam disertai dengan pengadukan. Kemudian hasil ekstrak cair dievaporasi sampai mendapat ekstraks kental, dan selanjutnya ekstraks kental diuapkan sampai memperoleh ekstraks kering masing-masing pelarut tersebut. Hasil penelitian menunjukkan bahwa konsentrasi etanol 100% mampu melakukan proses ekstraksi yang optimal dengan kandungan total fenol sebesar 35,21% b/b yang equivalen terhadap asam galat.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2015-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4374
10.20885/eksakta.vol14.iss2.art6
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 14, ISSUE 2, August 2014; 62-70
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4374/3859
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4375
2018-06-21T20:28:54Z
Eksakta:ART
Effect of Temperature on Rice Husk Asing and Its Application on Adsorbing Fe and Zn Metal in Patchouli Oil
Said, Ahmad
Fatimah, Is
Rubianto, Dwiarso
temperatur
abu sekam padi
minyak nilam
adsorbsi
Telah dilakukan studi pengaruh temperatur pembuatan adsorben abu sekam padi (ASP) dan aplikasinya pada adsorbsi logam Fe dan Zn dalam minyak nilam. Variasi temperatur pengabuan dilakukan pada 300, 500, dan 7000C selama 2 jam. Variasi temperatur pengabuan bertujuan mengkarakterisasiadsorben ASP. Karakterisasi yang dilakukan yakni penentuan silika secara gravimetri, diameter pori, morfologi abu dan komposisi unsurdengan teknik SEM/EDS,dan adsorptivitas terhadap metilen biru secara spektrofotometri. Tiga varian ASP diaplikasikan pada pemurnian minyak nilam dengan metode adsorbsi. Rendemen ASP-300, ASP-500, dan ASP-700 yang dihasilkan secara berurutan yaitu 35,4%, 25%, dan 16,5%. Kadar silikanya sebesar 43,12%, 72,12% dan 87,7%. Adsorbtivitas terhadap MB diperoleh 1,1616 mg/g, 0,7507 mg/g, dan 0,4128 mg/g. Diameter pori rata-rata antara 4,4 – 6,8μm. ASP mampu memurnikan minyak nilam dengan metode adsorbsi. Warna, bobot jenis, indeks bias, dan kadar logam Fe serta Zn pasca adsorbsi telah memenuhi standar mutu minyak nilam SNI. ASP-700 adalah adsorben paling baik dibandingkan ASP-500 dan ASP-300 dalam pemurnian minyak nilam.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2015-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4375
10.20885/eksakta.vol14.iss2.art7
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 14, ISSUE 2, August 2014; 71-86
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4375/3860
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4376
2018-06-21T20:26:37Z
Eksakta:ART
Synthesis Of Porous TiO2 With Starch Template And Its Photoactivity Towards Photodegradation Of Methylene Blue
Purwiandono, Gani
Kartini, Indriana
mesoporous TiO2
starch
template
photodegradation
methylene blue
Hydrothermal synthesis of TiO2 using starch as pores forming agent has been investigated. The research aimed to investigate the effect of crystallinity and porosity of TiO2 to its photocatalytic activity using photodegradation of methylene blue. TiO2 was synthesized without starch and with various starch concentration (0.5%, 2.5%, 5%, 10% w/v). The starch was dissolved in ethanol,and then was added drop wisely into titanium (IV) tetraisopropoxide(TTIP) solution. The mixture was treated hydrothermally at 100 ºC for 4 h. Starch templatewas removed through calcination at 450 ºC for 4 h. The synthesized TiO2 was characterized by FT-IR spectrophotometry. The effect of starch concentration toTiO2 crystallinity was analyzed using XRD. The porosity of the synthesized TiO2 was determined using N2 gas sorption analyzer. The photocatalytic activity of TiO2 was monitored through the photodegradation of methylene blue. The XRD patterns show that the TiO2 synthesized with various starch concentration consists mainly of anatase crystalline. The particle size of TiO2 synthesized with starch 5% w/v is 11.32 nm with the specific surface area (SBET) of 110.189 m2/g, the total pore volume of 0.2cc/g and the pore diameter of 3.62 nm. The photoactivity test demonstrates that the synthesized TiO2 could degrade methylene blue up to 56.9% under UV irradiation for 30 minutes
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-04-08
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4376
10.20885/eksakta.vol15.iss1-2.art1
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 15, ISSUE 1-2, 2015; 1-13
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4376/4118
Copyright (c) 2015 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4377
2018-06-21T20:26:37Z
Eksakta:ART
Air Pollution Simulation From Cirebon Power Plant Activity
Muhaimin, Muhaimin
Sugiharto, Eko
Suratman, Adhitasari
gaussian plume
PLTU
sebaran
Telah dilakukan penelitian simulasi sebaran polutan dari aktivitas PLTU Cirebon dengan menggunakan model gaussian plume. Persamaan gaussian plume digunakan untuk memprediksikan persebaran dan konsentrasi gas polutan di udara. Tujuan dari penelitian ini adalah untuk mengetahui konsentrasi polutan di udara ambien akibat dari aktivitas PLTU dan pemodelan dispersi polutan di udara yang berasal dari dua cerobong asap. Hasil penelitian menunjukkan bahwa konsentrasi maksimum untuk semua parameter masih berada di bawah baku mutu yang telah ditetapkan. Adapun konsentrasi maksimum untuk parameter SOx sebesar 36,89 µg/m3 sedangkan NOx adalah 31,25 µg/m3. Sedangkan simulasi dengan menggunakan dua cerobong asap konsentrasi maksimum SOx sebesar 52,95 µg/m3 dan NOx sebesar 44,86 µg/m3.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-04-08
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4377
10.20885/eksakta.vol15.iss1-2.art2
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 15, ISSUE 1-2, 2015; 14-22
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4377/3862
Copyright (c) 2015 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4378
2018-06-21T20:26:37Z
Eksakta:ART
Studi Komputasi Metode Ab Initio Dft Dalam Kajian Struktural Dan Sifat Elektronik Senyawa Kalsium Borohidrid-Diamonia Sebagai Penyimpan Hidrogen
Kurniawan, Muhammad Arsyik
penyimpan hidrogen
density functional theory
ikatan dihidrogen
Telah dilakukan kajian teoritis tentang struktur dan sifat elektronik dari senyawa Ca(BH4)2·2NH3 sebagai salah satu material yang berpotensi digunakan untuk menyimpan dan penghasil hidrogen melalui proses dehidrogenasi. Perhitungan teoritis energi, Density of States dan celah pita elektron dari struktur kompleks Ca(BH4)2·2NH3 dilakukan dengan Density Functional Theory (DFT) dan fungsi energi perubahan dan korelasi menggunakan metode Generalized Gradient Approximation (GGA). Berdasarkan analisis struktur dan sifat elektronik kristal kompleks Ca(BH4)2·2NH3 diperoleh atom–atom hidrogen yang berpotensi sebagai sumber molekul hidrogen yaitu hidrogen (Hδ-) dari BH4 dan hidrogen (Hδ+) dari NH3 dalam bentuk ikatan dihidrogen N– H···H–B. Hasil perhitungan simulasi didapatkan besar celah energi band gap sebesar 5,68 eV, yang menyatakan material ini sebagai insulator. Dari data analisis lebih lanjut terhadap studi pelepasan molekul H2 vs NH3 sebesar 2,30 eV vs 1,52 eV, mengindikasikan material Ca(BH4)2·2NH3 lebih rendah untuk melepaskan molekul H2 dibanding NH3, data ini sesuai dengan hasil pengamatan eksperimen.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-04-08
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4378
10.20885/eksakta.vol15.iss1-2.art3
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 15, ISSUE 1-2, 2015; 23-37
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4378/3863
Copyright (c) 2015 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4387
2018-06-21T20:26:37Z
Eksakta:ART
Semiempirical Study On Electronical Transition Spectra Of Ethyl Pmethoxycinnamate (EPMS) From Kencur (Kaempferia Galanga) For Sunscreen Component
Salmahaminati, Salmahaminati
Pradipta, Mokhammad Fajar
tabir surya
transisi elektronik
EPMS
IPMS
AM1
ZINDO/S
Telah dilakukan analisis in silico senyawa tabir surya Etil Para Metoksi Sinamat (EPMS) berdasarkan data transisi elektronik molekul senyawa yang bertujuan untuk memperkirakan EPMS sebagai senyawa tabir surya perisai alami UV-B. Kajian dilakukan dengan membuat model molekul senyawa tabir surya standar Isopropil Para Metoksi Sinamat (IPMS) yang dioptimasi geometri menggunakan metode semiempirik AM1 dan dilanjutkan optimasi analisis spektra transisi elektronik dengan metode ZINDO/S, ZINDO 1, PM3, dan AM1. Analisis spektra transisi elektronik difokuskan pada UV-B (290-315 nm). Hasil kajian secara umum menunjukkan analisis spekta transisi elektronik terbaik adalah ZINDO/s. Perhitungan dengan metode ZINDO/S pada IPMS menunjukkan λmax yaitu 290,77 nm dan senyawa EPMS diperoleh nilai λmax 292,41 nm. Hasil ini menunjukkan bahwa EPMS dapat dimanfaatkan sebagai perisai alami UV-B.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2015-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4387
10.20885/eksakta.vol15.iss1-2.art4
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 15, ISSUE 1-2, 2015; 38-47
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4387/3872
Copyright (c) 2015 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4388
2018-06-21T20:26:37Z
Eksakta:ART
Penerapan Regresi Logistik Biner Terboboti Geografi dengan Pembobot Fixed Bi-Square (Geographically Weighted Binary Logistic Regression with Fixed Bi-Square Weight)
Purwaningsih, Tuti
GWR
Regresi Logistik Biner Terboboti Geografi
Fixed Bi-Square
Model Global
Model Lokal
Regresi terboboti geografi adalah salah satu model yang digunakan dalam regresi spasial. Model tersebut digunakan ketika regresi spasial mengalami masalah heteroskedastisitas. Setiap lokasi akan memiliki model yang berbeda-beda tergantung dari signifikansi koefisien regresi yang ada pada setiap variable disetiap lokasi. Kemudian jika tipe data dari variabel respon adalah biner maka akan disebut sebagai regresi logistik biner terboboti geografi. Penelitian ini bertujuan untuk menerapkan model tersebut pada kasus riel. Data yang digunakan diambil dari survei PODES yang terdiri dari satu variabel respon bertipe biner dan tiga variabel penjelas bertipe rasio. Variabel respon tersebut adalah kategori kemiskinan pada setiap kabupaten dan variabel penjelasnya adalah persentase desa perdagangan, persentase desa jasa dan rasio sekolah perdesa. Dari penelitian ini menghasilkan dua jenis model yaitu model global dan model lokal. Pada model global hanya dua variabel penjelas yang signifikan berpengaruh terhadap kategori kemiskinan di Pulau Jawa dengan nilai AIC sebesar 122.563. Pada Model Lokal menghasilkan hasil yang berbeda tergantung dari koefisien yang signifikan pada setiap kabupaten.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2015-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4388
10.20885/eksakta.vol15.iss1-2.art5
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 15, ISSUE 1-2, 2015; 48-54
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4388/3873
Copyright (c) 2015 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4389
2018-06-21T20:26:37Z
Eksakta:ART
Monitoring Penggunaan Formalin Pada Daging Ayam (Observation The Use Of Formalin In Chicken)
Primatika, Roza Azizah
Susetya, Heru
Sari, Arselia Kartika
chicken
formaldehyde
traditional market
Chicken is one of source of animal protein which consumed by many people. Although the animal protein is needed as a source of nutrition, the product becomes a danger when contain of formalin. This study aims to determine the level of use of formaldehyde in chicken meat in Yogyakarta traditional markets and the factors associated with the incident. The samples used were 56 chickens, obtained from 11 traditional markets in Yogyakarta were chosen randomly. Each sample was tested using two reagent is phenylhydrazine and Quantofiq. Interpretation of test phenylhydrazine that is colored bluegreen solution and eventually turned into a red-orange color if the sample is positive, and yellow if it is negative. At Quantofiq test the color will be formed at the end of the detection paper, then color matched to the color table to determine levels of formaldehyde in the samples tested. The results showed that 6 (10,7%) positive samples contain of formaldehyde and analysis of Chi-Square showed that p_value = 0.045. So sales location were association with used of formaldehyde in chicken meat.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2015-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4389
10.20885/eksakta.vol15.iss1-2.art6
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 15, ISSUE 1-2, 2015; 55-60
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4389/3874
Copyright (c) 2015 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4390
2018-06-21T20:26:37Z
Eksakta:ART
Distribution Of The Difference Of Two Independent Poisson Random Variables And Its Application To The Literate Population Data
Ahdika, Atina
distribusi Poisson
distribusi Poisson Difference
fungsi pembangkit momen
fungsi massa peluang
metode momen
metode maksimum likelihood
Kajian mengenai distribusi dari suatu fungsi peubah acak, khususnya mengenai distribusi dari jumlah dua atau lebih peubah acak, sudah banyak dilakukan. Sedangkan kajian mengenai distribusi dari selisih dua peubah acak masih jarang dilakukan, terlebih pada peubah acak-peubah acak diskrit. Penelitian ini berfokus pada penurunan distribusi selisih dua peubah acak Poisson yang saling bebas. Metode yang digunakan untuk menentukan distribusi tersebut adalah metode fungsi pembangkit momen dan metode fungsi massa peluang. Karakteristik-karakteristik dari distribusi diturunkan melalui sifat-sifat dari momen ke- k ; khususnya dari momen pertama hingga momen keempat. Selanjutnya, distribusi dari selisih dua peubah acak Poisson yang saling bebas ini akan dibandingkan dengan distribusi Poisson Difference (PD) yang diturunkan oleh Alzaid dan Omair (2010) atau dikenal juga dengan nama distribusi Skellam. Parameter-parameter dari distribusi diestimasi menggunakan metode momen dan maksimum likelihood. Aplikasi pada data penduduk melek huruf dilakukan untuk mendapatkan pemahaman yang lebih baik mengenai distribusi tersebut.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2015-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4390
10.20885/eksakta.vol15.iss1-2.art7
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 15, ISSUE 1-2, 2015; 61-74
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4390/3876
Copyright (c) 2015 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4391
2018-06-21T20:26:37Z
Eksakta:ART
Identifikasi Morfologi dan Uji Aktivitas Antimikroba Terhadap Bakteri Escherichia coli Dari Fermentasi Buah Markisa (Passiflora sp.)
Hidayat, Habibi
Markisa
Escerichia coli
Antimikroba
Pewarnaan Gram
Telah dilakukan studi identifikasi bakteri dari buah Markisa dan uji aktivitas antimikroba terhadap bakteri Escerichia coli. Sampel yang digunakan dalam penelitian ini berasal dari buah Markisa, dimana penelitian ini bertujuan untuk mengidentifikasi morfologi bakteri yang tumbuh dalam proses fermentasi buah markisasecara mikroskopik, dan uji aktivitas antimikroba dari hasil fermentasi Markisa (Passiflora Sp.) terhadap bakteri Escerichia coli. Identifikasi morfologi yang dilakukan dengan metode pewarnaan Gram dan uji aktivitas antimikroba dengan menggunakan metode cakram. Hasil yang diperoleh dari terhadap kedua isolat yaitu S1 berbentuk basil dan S2 berbentuk basil dan kokus. Perhitungan jumlah koloni pada pengenceran 10-7 diperoleh S1 sebanyak 16.107 cfu/ml dan S2 sebanyak 30.107 cfu/ml. Uji aktivitas antimikroba terhadap bakteri patogen Escerichia coli selama 1 x 72 jam yaitu isolat S1 diperoleh zona hambat pertumbuhan bakteri sebesar 11 mm, 13 mm dan 15 mm dan isolat S2 sebesar 13 mm, 14 mm dan 16 mm.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2015-12-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4391
10.20885/eksakta.vol15.iss1-2.art8
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 15, ISSUE 1-2, 2015; 75-84
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4391/3877
Copyright (c) 2015 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4395
2018-06-21T20:24:55Z
Eksakta:ART
A Highly Sensitive Electrochemical Glucose Sensor By Nickel-Epoxy Electrode With Non-Enzymatic Sensor
Riyanto, Riyanto
glucose
sensor
nickel-epoxy
non-enzymatic
The preparation of new sensor for glucose was based on the fact that glucose can be determined by non-enzymatic glucose oxidase. The Ni metals (99.98% purity, 0.5 mm thick, Aldrich Chemical Company) was used to prepare Ni-Epoxy electrode. The Ni-epoxy electrodes were prepared in square cut of 1 cm and 1 mm by length and wide respectively. The Ni metal electrodes were connected to silver wire with silver conducting paint prior covered with epoxy gum. The prepared of nickel-epoxy modified electrode showed outstanding electro catalytic activity toward the oxidation of glucose in alkaline solution. The result from this research are correlation of determination using Nickel-Epoxyelectrode for electroanalysis of glucose in NaOH was R2 = 0.9984. LOQ, LOD and recovery of the Nickel-Epoxy electrode towards glucose were found to be 4.4 μM, 1.48 μM and 98.19%, respectively. The Nickel-Epoxy wire based electrochemical glucose sensor demonstrates good sensitivity, wide linear range, outstanding detection limit, attractive selectivity, good reproducibility, high stability as well as prominent feasibility use of non-enzymatic sensor for monitoring glucose in human urine owing to its advantages of low cost, simple preparation and excellent properties for glucose detection.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-03-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4395
10.20885/eksakta.vol16.iss1.art1
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 16, ISSUE 1, February 2016; 1-8
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4395/3879
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4396
2018-06-21T20:24:55Z
Eksakta:ART
Optimation Of Ethanol Extract Of Centella Asiatica And Cresintia Cujete Composition As Natural Antioxidant Source
Ahda, Mustofa
Fiqrirozi, Fiqrirozi
Habibah, Gina Noor
Lestari, Mas Ulfah
Hardianto, Tomy
Andriani, Yuni
Aktifitas Antioksidan
pegagan (Centella asiatica)
majapahit (Cresintia cujete)
Komposisi Ekstrak
Pengembangan antioksidan alami dalam pemanfaatan pegagan (Centella asiatica) dan majapahit (Cresintia cujete) merupakan potensi yang besar. Penelitian ini telah melakukan optimasi komposisi ekstrak etanol pegagan (Centella asiatica) dan majapahit (Cresintia cujete) sebagai sumber antioksidan dengan dilakukan uji aktifitas penangkapan radikal bebas terhadap DPPH. Hasil penelitian menunjukkan bahwa baik ekstrak etanol pegagan (Centella asiatica) dan majapahit (Cresintia cujete) memiliki kandungan total fenol yang ditunjukkan dengan adanya kemampuan mereduksi reagen Folin Ciocalteu menjadi berwarna biru. Hasil optimasi komposisi ekstrak pegagan (Centella asiatica): majapahit (Cresintia cujete) = 30:70 memiliki aktifitas penangkapan radikal bebas terhadap DPPH yang paling baik dibandingkan ekstraks etanol pegagan (Centella asiatica) dan majapahit (Cresintia cujete). Nilai IC50 untuk komposisi ekstrak etanol pegagan (Centella asiatica): majapahit (Cresintia cujete) = 30:70 sebesar 0,103 mg/mL.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-03-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4396
10.20885/eksakta.vol16.iss1.art2
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 16, ISSUE 1, February 2016; 9-16
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4396/3880
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4397
2018-06-21T20:24:55Z
Eksakta:ART
Model of Community Capacity In Facing Disaster Using Ordinal Logistic Regression Analysis
Nugraha, Jaka
Nugraheni, Fitri
Kurniawan, Irwan Nuryana
kapasitas
mitigasi
regresi logistik
SEM
Indonesia is geographically a country with potential natural disasters which is high for various types of disasters such as floods, earthquakes, landslides, drought and volcanoes. A regional disaster risk reduction can be done with increase the capacity of government and communities in disaster mitigation. On this paper discusses the formulation of community capacity models in the face of disaster using ordinal logistic regression analysis. The regression model was prepared using three dependent variables are (i) general knowledge of risk reduction natural disaster symbolized by Y1 (ii) general knowledge possessed about how to save the family when a natural disaster is symbolized by Y2 (iii) efforts to increase citizens' awareness of natural disasters by related parties symbolized by Y3. The dependent variables Y1 and Y2 are influenced by the Knowledge Factor and Factor Plan of Action. While the dependent variable Y3 is influenced by Factor leadership and programs, and Facility Factors.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-03-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4397
10.20885/eksakta.vol16.iss1.art3
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 16, ISSUE 1, February 2016; 17-26
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4397/3881
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4398
2018-06-21T20:24:55Z
Eksakta:ART
Kinetics Study Of Au(Iii) Adsorption On Gallic Acid Intercalated Mg/Al-Hydrotalcite
Yanti, Ika
Santosa, Sri Juari
Kartini, Indriana
Kinetika
isoterm
hidrotalsit
adsorpsi
Au(III)
Studi kinetika adsorpsi Au(III) pada Mg/Al-Hidrotalsit (Mg/Al-HT) terinterkalasi asam galat (AG) dilakukan dengan cara interaksi antara larutan Au(III) dalam spesies AuCl4- dengan sejumlah Mg/Al-HT-AG yang disintesis melalui metode kopresipitasi langsung (direct synthesis). Parameter yang digunakan dalam penentuan kinetika adsorpsi adalah variasi waktu kontak dan untuk untuk penentuan isoterm adsorpsi dilakukan variasi konsentrasi Au(III) dengan waktu kontak optimum. Analisis kandungan Au(III) yang tidak teradsorpsi pada adsorben Mg/Al-HT terinterkalasi AG dilakukan analisis dengan AAS. Adsorpsi Au(III) oleh Mg/Al-HT terinterkalasi AG yang berlangsung pada pH 3 mengikuti model kinetika pseudo orde dua dengan konstanta laju (k) 3,798x10-4 g.mg-1.menit-1serta model isoterm adsorpsimengikuti model isoterm Langmuir dengan kapasitas adsorpsi (qmaks) 625 mg.g-1.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-03-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4398
10.20885/eksakta.vol16.iss1.art4
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 16, ISSUE 1, February 2016; 27-35
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4398/3882
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4675
2018-06-21T20:24:55Z
Eksakta:ART
Film Of Chitosan-Carboxymethyl Cellulose Polyelectrolyte Complex as Methylene Blue Adsorbent
Indah Fajarwati, Febi
Sugiharto, Eko
Siswanta, Dwi
Kitosan
karboksimetil selulosa
kompleks polielektrolit
adsorpsi
Telah dilakukan pembuatan film kompleks polielektrolit kitosan-karboksimetil selulosa (CMC) untuk pengujian pengaruh rasio volume CMC:kitosan (1:1; 3:2; 7:3). Karakterisasi film dilakukan dengan uji kuat tarik, medium asam basa, dan penyerapan air serta dilakukan uji adsorpsi terhadap biru metilen. Hasil Karakterisasi menunjukkan sifat mekanik film menurun dengan bertambahnya jumlah karboksimetil selulosa dan film stabil pada pH >4. Kondisi optimum adsorpsi diperoleh pada film F3 (ratio volume CMC:kitosan 7:3) dengan kapasitas adsorpsi sebesar 8,38×10-5 mol/g selama 30 menit.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-05-22
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4675
10.20885/eksakta.vol16.iss1.art5
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 16, ISSUE 1, February 2016; 36-45
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4675/4119
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4677
2018-06-21T20:24:55Z
Eksakta:ART
Study on Lignin Isolation from Oil Palm Empty Fruit Bunches
Iman Prakoso, Nurcahyo
Purwono, Suryo
Rochmadi, Rochmadi
lignin
isolasi
tandan kosong kelapa sawit
Telah dilakukan studi tentang isolasi lignin dari tandan kosong kelapa sawit dengan metode batch. Diharapkan melalui studi ini dapat memperoleh metode isolasi lignin yang optimal. Studi yang dilakukan meliputi optimasi suhu reaksi, rasio massa NaOH terhadap pelarut, rasio serabut terhadap pelarut, dan waktu reaksi. Dari semua perlakuan, didapatkan bahwa suhu reaksi, tekanan, konsentrasi NaOH, rasio serabut terhadap pelarut dan waktu reaksi optimum berturut-turut yaitu, 170 °C, 15 atm, 1% (b/v), 9% (b/v), dan reaksi dilakukan selama 5 jam
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-12-12
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4677
10.20885/eksakta.vol16.iss1.art6
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 16, ISSUE 1, February 2016; 46-54
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4677/7695
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/4678
2018-06-21T20:24:55Z
Eksakta:ART
Metode Improved CHAID (chi-squared automatic interaction detection) Pada Analisis Kredit Macet BMT (Baitul Mal wa Tamwil)
Muhajir, Muhammad
Segmentasi nasabah
Status Kredit
Tschuprow’s T
Improved CHAID
Penelitian ini bertujuan untuk menetukan segmentasi nasabah berdasarkan karakteristik status kreditnya pada BMT El Bummi 372. Segmentasi ini bertujuan untuk mengidentifikasi segmen nasabah potensial dengan harapan resiko kredit macet yang dapat diminimumkan. Penelitian ini menggunakan data sekunder, yang terdiri dari 945 nasabah yang terdiri dari 94 macet dan 851 tidak macet. Salah satu metode riset segmentasi yaitu Improved CHAID (Chi-Squared Automatic Interaction Detection analysis) yang merupakan perbaikan dari metode CHAID dengan mengelaborasi tabel kontingensinya dengan Tschuprow’s T. Improved CHAID akan menghasilkan diagram yang mirip dengan diagram pohon keputusan yang menyediakan informasi tentang derajat hubungan antara variabel dependen terhadap variabel independen serta informasi mengenasi karakteristik segmen. Pada kasus BMT El Bummi 372,didapatkan enam segmen. Segmen nasabah dengan karakteristik pendidikan (Diploma/S1/Profesi, S2/S3), usia ≤ 50 tahun, ukuran keluarga ≤ 3 orang dan penghasilan >Rp. 1.500.000,00 adalah segmen yang memiliki rasio kredit macet yang paling rendah.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-05-22
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/4678
10.20885/eksakta.vol16.iss1.art7
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 16, ISSUE 1, February 2016; 55-63
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/4678/4136
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/5021
2018-06-21T20:25:21Z
Eksakta:ART
Bootstrapping Residuals to Estimate the Standard Error of Simple Linear Regression Coefficients
Kurniawan, Muhammad Hasan Sidiq
bootstrap
simple linear regression
least square
residuals
standard error
Regression models are the statistical methods that widely used in many fields. The models allow relatively simple analysis of complicated situations. The aim of the regression models is to analyze the relationship between the predictor and response. In order to do that, we have to estimate the regression coefficient. In case of simple linear regression, the method to estimate the regression coefficient is either least square method or maximum likelihood estimation. Also, the standard error of the regression coefficient is being estimated. In this paper, we apply the bootstrap method to estimate the standard error of the regression coefficient. We compare the result of the bootstrapping method with the least square method. From this study, we know that the standard error estimation value of regression model using the bootstrap method is close to the value if we use the least square method. So we can say that the bootstrap method can be used to estimate the standard error of another regression models coefficient which does not have the closed-form formula
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-06-13
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/5021
10.20885/eksakta.vol16.iss2.art1
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 16, ISSUE 2, August 2016; 64-69
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/5021/4448
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/5047
2018-06-21T20:25:21Z
Eksakta:ART
Utilization of Waste Extracts Residual Tobacco Cigarette Manufacturing and Leaves of Mahkota Dewa as a Natural Pesticide for Pest Control Armyworms in Chili Plant
Cahyati, Cahyati
Marlina, Marlina Marlina
Nurlestari, Rizqy Nurlestari
lestari, Indrasti Dwi Puji
Julianto, Tatang Shabur
natural pesticides
alkaloids
armyworm
tobacco
leaves of mahkota dewa
The use of pesticides is still considered behind a great benefit for increasing agricultural production. Quite high negative impact of the use of synthetic pesticides to encourage efforts to pursue the empowerment of natural pesticide as alternative to synthetic pesticides. On tobacco and leaves of mahkota dewa found a substance alkaloid that can help ward off attacks, especially armyworm. Has conducted research utilization of waste residual tobacco cigarette manufacturing at a company and leaves of mahkota dewa as a natural pesticide to eradicate the armyworm. The residual tobacco cigarette manufacturing and leaves of mahkota dewa isolated manner extracted with an organic solvent so that the resulting crude extract alkaloids. The resulting crude alkaloid used as a pesticide solution sprayed on the leaves of chili to eradicate the pest armyworms. Test result showed that the insecticidal activity of alkaloid extract concentration of 1,6 ppm has the highest insecticidal activity. However, engaging both the alkaloid extract provides insecticidal activity is lower than the alkaloid extract of leaves of mahkota dewa so that the most effective in the use of alkaloid extract of leaves of mahkota dewa. Identification of the alkaloid compounds have been analyzed by TLC. This analysis showed that compound in waste of tobacco cigarette manufacture is nicotine and triterpenoids whereas the alkaloid extract of the leaves of mahkota dewa form of narcotic
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-06-15
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://journal.uii.ac.id/Eksakta/article/view/5047
10.20885/eksakta.vol16.iss2.art2
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 16, ISSUE 2, August 2016; 70-79
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/5047/4476
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/5852
2018-09-21T10:42:10Z
Eksakta:ART
Characterization And Study Of Iron(III)-Released From Alginate/Zeolite/Fe Composite
Sukma, Nia Silvia
Arryanto, Yateman
Sutarno, Sutarno
alginate/zeolite/iron composite
characterization
study of iron release
Alginate is an organic polymer that is isolated from brown algae and bacteria, while the zeolite is an aluminosilicate mineral sample. The purpose of this study was to synthesize composite alginate / zeolite / Fe, characterize composite alginate / zeolite / Fe, and assessing the release properties of Fe (III) of the composite alginate / zeolite / Fe. Characterization of the composite is done by observing the color composite macroscopically, and observing the pattern of distribution of zeolite particles in composites using SEM (Scanning Electron Microscope). As for assessing the release of Fe (III) of the composite system made by soaking the composite in a solution of citric acid 0,33M for nine hours. Components of Fe (III) were dissolved in acid systems were analyzed using UV-Vis spectrophotometer.The results showed that the composite alginate / zeolite / Fe have colors that are significantly dependent on the component ratio of alginate and zeolitnya. SEM analysis provides information that the zeolites distributed evenly on alginate-Fe phase. The release profile of Fe (III) of the composite alginate / zeolite / Fe weight variation component alginate produced three mechanisms to increase and decrease the rate of release of Fe (III). While the release profile of Fe (III) of the composite alginate / zeolite / Fe by weight of the zeolite component generates two mechanisms that increase and decrease the rate of release of Fe (III).
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-08-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/5852
10.20885/eksakta.vol16.iss2.art3
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 16, ISSUE 2, August 2016; 80-93
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/5852/5572
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/5940
2022-04-13T04:46:53Z
Eksakta:ART
IMPROVEMENT OF THE PRODUCT AND QUALITY OF POGOSTEMON CABLIN BENTH
Allwar, Allwar
fatimah, is
fitri, noor
rubiyanto, dwiarso
Pogostemon cablin benth
chelating method
the influence of pH and adsorption method
Pogostemon cablin benth is an economic source of farmer communities which are presence in several provinces in Indonesia. In general, the production and quality of the Pogostemon cablin benth produced by the farmers are still low or under the standard ISO. The chelating method, the influence of pH and adsorption method with activated carbon and montmorilonite were carried out to improve the production and quality of Pogostemon cablin benth. The results show that the production and the quality tends to be better proved by the color changes to yellow bright, reduced metal contents and an increase in Pogostemon cablin benth
Fakultas Matematika dan Ilmu Pengetahuan Alam
2014-07-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/5940
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 14, ISSUE 1, February 2014; 34-41
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/5940/5362
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/5947
2018-06-21T20:29:07Z
Eksakta:ART
Antibacterial Activities of Green Basil (Ocimum Violaceum) Essential Oil and Derivatives By MAOS (Microwave Assisted Organic Synthesis) Against Staphyllococus Aureus and Escherichia Coli
Rubiyanto, Dwiarso
Anshory, Hady
Sastrohamidjojo, Hardjono
Anwar, Chairil
essential oils
green basil
anti-bacteria
S. aureus
E. coli
MAOS
Green basil (Ocimum violaceum , Linn.) plantis part of the varieties of basil (Ocimum basilicum, Linn.). Green basil essential oil (GBEO) contain chemical compounds that have an anti- bacterial activities . Methyl eugenol and methyl chavikol are in green basil oil has the potential to be used as a material which is biologically active. Conversion reaction of the compounds in GBEO with MAOS methods (microwave assisted organic synthesis) aims to obtain properties of the main chemical component in a wider sweet basil oil, and are also useful in an attempt to gain more valuable compounds for commercial and higher. The results showed that the optimum reaction conditions on the conversion reaction of compounds in GBEO with MAOS method with ethylene glycol as a solvent is 10 % KF/Al2O3as catalyst and reaction time 3 minutes , while the solvent is glycerol 10 % KF/Al2O3as catalyst and reaction time 2 minutes . Comparison of anti-bacterial activity resulting from this research are : the inhibitory activity to the growth of S. aureus bacteria have the following order : GBEO > green basilEG10-3 > green basil G10-2> amoxicillin with each inhibition zone diameter amounted to 30.7 mm, 21.1 mm, 18.2 mm and 13.4 mm. While the inhibitory activity to the growth of E.coli bacteria are : GBEO> green basil G10-2 >green basil EG10-3 > amoxicillin with each inhibition zone diameter of 21.1 mm, 15.6 mm , 15.2 mm and 7.9 mm . GBEO and its derivatives have minimal inhibitory concentrations below 1.25 %. From the results of the study found that the main derivates obtained are p-methoxy anisaldehyde , caryophyllene oxide , 3-methoxy cinnamaldehyde , humulena oxide and delta cadinol
Fakultas Matematika dan Ilmu Pengetahuan Alam
2014-07-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/5947
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 14, ISSUE 1, February 2014; 1-19
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/5947/5369
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/5969
2018-06-21T20:29:07Z
Eksakta:ART
Adsorption Isotherm of Cr(VI) Using Mg/Al Hydrotalcite with Molar Ratio 2:1
Wiyantoko, Bayu
Kurniawati, Puji
Purbaningtias, Tri Esti
adsorption
Mg/Al hydrotalcite
adsorption isotherm
Hydrotalcite is a material which is used in various application and one of them as an adsorbent of Cr(VI). Hydrotalcite was synthesized using co-precipitation method with Al(NO3)3.9H2O and Mg(NO3)2.6H2O as raw materials. This research aim to study the initial concentration and adsorption isotherm of Cr(VI) by using Mg/Al hydrotalcite in 180 minutes contact time. The Optimum initial concentration of Cr(VI) was 675 mg/L with 55,57 mg/g adsorption capacity. Isotherm adsorption was studied using Langmuir and Freundlich model. Based on the result, the adsorption of Cr(VI) fitted well with Langmuir isotherm model by 0,997 coefficient of determination
Fakultas Matematika dan Ilmu Pengetahuan Alam
2014-07-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://journal.uii.ac.id/Eksakta/article/view/5969
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 14, ISSUE 1, February 2014; 20-26
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/5969/5391
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/6019
2018-06-21T20:29:07Z
Eksakta:ART
Decreasing in Acid Number of Patchouli Oil by Different Natural Adsorbent and Variation of Contact Time
Purbaningtias, Tri Esti
Wiyantoko, Bayu
Kurniawati, Puji
Sari, Mustika Kusuma
Patchouli oil
acid number
natural adsorbent
contact time
One way for improving (of improving atau to improve) the quality of patchouli oil was to reduce the acid number. Acid number could be reduced with the use of natural adsorbents. The decreasing percentage acid number of patchouli oils using adsorbents zeolites, bentonite, rub ash, and activated carbon, respectively 4.71 %; 1.45%; 7,84%; and 4.64%. The contact time could influence the decrease in acid number of patchouli oil. The longer the contact between adsorbent and oil could caused a decrease in acid number. Maximum contact time for rub ash was 15 hours with a maximum adsorption capacity of 14,34% for 0.1 gram adsorbent
Fakultas Matematika dan Ilmu Pengetahuan Alam
2014-08-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
binary/octet-stream
https://journal.uii.ac.id/Eksakta/article/view/6019
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 14, ISSUE 1, February 2014; 27-33
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/6019/5435
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/6032
2018-06-21T20:29:07Z
Eksakta:ART
Fuzzy T2 Hotelling (T_f^2 ) Control Chart
Kesumawati, Ayundyah
Mashuri, Mashuri
Irhamah, Irhamah
Fuzzy Multivariate Control Chart
Fuzzy Median Transformation
Algorithm Fuzzy T2 Hotelling
Statistical Process Control (SPC) is a method used to monitor a process for identifying special causes of variation and necessary to improve the process. One technique commonly used in the SPC is to determine whether the process is stable or not, both the mean and variability. Multivariate control charts are used if necessary to control together two or more related quality characteristics. Sometimes in a process production there is a lack of precision in the calculation, especially if the data used in the form of either data or qualitative attributes. Fuzzy set theory, specifically discusses the development of concepts and techniques related to the sources of uncertainty or imprecision in nature. Control charts are constructed by transforming crisp numbers into fuzzy numbers can be an alternative to obtain representative results of several variables in which there are several quality characteristics. Transformation of some functions, which are used in this study is Fuzzy Median Transformation (FMT). The advantages of FMT is that it can be used for the data in the form of asymmetry. This paper will discuss about the algorithm for Fuzzy T2 Hotelling control chart and its application to the production data of PT. IGLAS (Persero). From the results of the application of Fuzzy T2 Hotelling control chart got that out of the 5 variables that were analyzed, the dominant variables that lead to out of control is variable bottle molding process
Fakultas Matematika dan Ilmu Pengetahuan Alam
2014-08-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
binary/octet-stream
https://journal.uii.ac.id/Eksakta/article/view/6032
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 14, ISSUE 1, February 2014; 41-51
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/6032/5448
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/6034
2018-06-21T20:29:07Z
Eksakta:ART
Waste Cooking Oil Conversion To Biodeisel Catalized By Egg Shell Of Purebred Chiken With Ethanol As A Solvent
Tehubijuluw, Hellna
Sutapa, I Wayan
Lethulur, Mealan
biodiesel
CaO
esterification
transesterification
waste cooking oil
The synthesis of biodiesel from the waste cooking oil was carried out using the catalyst from egg shell of purebred chiken with ethanol as a solvent. Synthesis of biodiesel was prepared in two steps, esterification and transesterification. Esterification was conducted in mol ratio of ethanol and waste cooking oil of 9:1 with H2SO4 as a catalyst. Mol ratio of ethanol and used cooking oil in the transesterification of 12:1 with the CaO catalyst of shell eggs. CaO catalyst was yielded by calcinations egg shell of purebred chicken on 1000 for two hours. Calcination product was characterized with XRD to determine of CaO. Result of biodiesel was characterized based on FTIR, H-NMR, dan ASTM (American Standard Testing of Materials). Theoretically,yielded of biodiesel was 58% and experiment was 36.779%.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2014-08-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
binary/octet-stream
https://journal.uii.ac.id/Eksakta/article/view/6034
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 14, ISSUE 1, February 2014; 52-64
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/6034/5450
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/6581
2018-10-23T14:02:57Z
Eksakta:ART
Synthesis and Characterization of 2,3,4-Trihydroxy-5-methyl Xanthone as Antimalarial Compound
Fitriastuti, Dhina
Jumina, Jumina
Priatmoko, Priatmoko
xanthone
synthesis
antimalarial
Synthesis of xanthone derivatives had been conducted to obtain new antimalaria active compounds. The characterization of the synthesized xanthones was also conducted. Synthesis of xanthone was conducted from the raw material of hydroxybenzoic acid and phenol derivatives using Eaton's reagent via acylation-dehydration reaction by modified Grover, Shah and Shah (GSS) method. The synthesis of 2,3,4-trihydroxy-5-methyl xanthone was carried out using gallic acid, o-cresol and Eaton's reagent.The mixture was heated for 3 h at 80 °C to yield 2,3,4-trihydroxy-5-methyl xanthone in 43% yield as dark red viscous liquid. The results of IR, 1H-NMR and 13C-NMR analysis of sampleshowed that the compound2,3,4-trihydroxy-5-methyl xanthonehas successfully synthesized.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-10-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://journal.uii.ac.id/Eksakta/article/view/6581
10.20885/eksakta.vol16.iss2.art4
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 16, ISSUE 2, August 2016; 94-102
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/6581/5932
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/6587
2018-09-21T10:50:04Z
Eksakta:ART
Synthesis of Chalcones Substituted with Nitro and Hydroxyl Group in Alkaline Medium
Fauzi'ah, Lina
Wahyuningsih, Tutik Dwi
kalkon
kondensasi Claisen Schmidt
4-nitroasetofenon
6-nitroveratraldehida
Telah dilakukan sintesis turunan senyawa kalkon tersubstitusi gugus nitro dan hidroksi melalui reaksi kondensasi Claisen Schmidt. Tujuan penelitian ini adalah untuk mensintesis senyawa kalkon yang tersubstitusi gugus hirdoksi dan nitro dalam medium basa, dan mempelajari pengaruh gugus tersebut dalam reaksi kondendasi. Kalkon 1 disintesis dari 4-nitroasetofenon dan vanilin menggunakan katalis NaOH 60% (b/v dalam akuades) melalui pengadukan selama 24 jam. Kalkon 2 didapatkan dari reaksi antara 4-nitroasetofenon dan veratraldehida dengan katalis NaOH 15% selama 4 jam, sedangkan kalkon 3 disintesis dari 4-nitroasetofenon dan 6-nitroveratraldehida dalam 5% NaOH 10 tetes. Produk hasil sintesis dikarakterisasi dengan FTIR, GC-MS dan 1H-NMR.Hasil penelitian menunjukkan bahwa senyawa kalkon telah berhasil disintesis dengan rendemen berturut-turut sebesar 16,80; 75,83; dan 44,11 % dalam medium basa. Dari penelitian ini, dapat disimpulkan bahwa adanya gugus hidroksi dari sumber aldehida aromatik pada kalkon 1 menghambat terjadinya reaksi, sedangkan gugus nitro yang terikat pada aldehida aromatik menjadi kendala pada reaksi kalkon 3 karena sifatnya yang sensitif terhadap cahaya.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-10-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/6587
10.20885/eksakta.vol16.iss2.art5
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 16, ISSUE 2, August 2016; 103-114
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/6587/5957
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/6652
2018-06-21T20:25:21Z
Eksakta:ART
Effect of Adding 1,4-Butanediol and Polyethylene Glycol (PEG) 1000 to the Ease of Bioplastic Biodegradation from Jackfruit Beans (Artocarpus heterophyllus)
Anas, Argo Khoirul
Ariefta, Nanang Rudianto
Nurfiana, Yuni
Rohaeti, Eli
Acetobacter xylinum
Jackfruit Seeds
Bioplastic
Plasticizer
The influences of plasticizer on the biodegradability of bioplastic film synthesized from starch obtained from jackfruit seeds with a help of Acetobacter xylinum were investigated. In this study, 1,4-butanediol and polyethylene glycol (PEG) 1000 were used as plasticizer. The biodegradation behavior of the resulted bioplastic films was characterized by calculating changes in their mass loss and rate of mass loss. The Fourier Transform Infrared (FTIR) spectroscopy was also conducted to analyze theirfunctional group. The results shows that all the bioplastic films were well biodegradated, where PEG 1000 with concentration of 0,5% and 1,0% can successfully improve the biodegradability of bioplastic film. Meanwhile, the used of 1,4-butanediol with concentration of 0,5% and 1,0% can increase and decrease the biodegradability of sample, respectively.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-10-24
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
binary/octet-stream
https://journal.uii.ac.id/Eksakta/article/view/6652
10.20885/eksakta.vol16.iss2.art6
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 16, ISSUE 2, August 2016; 115-123
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/6652/5958
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/6653
2018-06-21T20:25:21Z
Eksakta:ART
The Study of In-Migration between Provinces in Indonesia by Panel Data Regression
Rahmah, Asmadhini Handayani
In-Migration
Gross Domestic Product (GDP)
the Regional Minimum Wage
Unemployment Rate (TPT)
Labor Force Participation Rate (LFPR)
Panel Data Regression
Fixed Effect model
Indonesia has 34 provinces. There are many peoples spread out across Indonesia and the vast area owned makes Indonesia become one of the biggest 4 (four) most population country in the world. However, the population density is not spread evenly in Indonesia. This has become interesting to be observed how the distribution of population in Indonesia by using variable in-migration as a dependent variable that is assumed to be influenced by four (4) independent variables. Thoseindependent variables are the Gross Domestic Product (GDP), the Regional Minimum Wage, Unemployment Rate (TPT) and Labor Force Participation Rate (LFPR). Data is collected fromwww.BPS.go.id . The analysistool used panel data regression, denote a data type is a combination of time series data (time series) and cross section data. The best selected model used in this research is Fixed Effect model to obtain 33 models for 33 provinces. The variables that influence the inmigration is the Open unemployment rate (TPT), which has a negative correlation to in-migration, while the Labor Force Participation Rate (LFPR) has a positive correlation.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-10-25
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://journal.uii.ac.id/Eksakta/article/view/6653
10.20885/eksakta.vol16.iss2.art7
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 16, ISSUE 2, August 2016; 124-136
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/6653/5959
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/6654
2018-06-21T20:25:21Z
Eksakta:ART
Green Chemistry: Effect of Microwave Irradiationon Synthesis of Chitosan for Biomedical Grade Applications of Biodegradable Materials
Setyawati, Amri
Pranowo, Deni
Kartini, Indriana
Chitin
Chitosan
Microwave Reaction
Microwave assisted chitosan synthesis as biodegradable material for biomedical application has been done. The purpose of this research is to synthesis of chitosan with high DD and low molecular weight using microwave energy, the study of reaction conditions include parameters of power and reaction time. Chitosan was prepared by deacetylation of chitin with 60% NaOH solution. Conventional method has been done by reflux for 90minutes, resulting chitosan with DD of 79.5%, 72.6% yields and molecular weight 6051 g/mol. Green chemistry method using microwave radiation at 800 Watts for 5 minutes has produced chitosan with highest DD, yield and molecular weight of 86%, 75% and 3797 g/mole respectively. Synthesis of Chitosan by microwave radiation method can save 10x electrical energy for the reaction, also rapidly and effectively to produce chitosan with low molecular weight compared to conventional methods
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-10-25
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
"application/pdf"
https://journal.uii.ac.id/Eksakta/article/view/6654
10.20885/eksakta.vol16.iss2.art8
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 16, ISSUE 2, August 2016; 137-148
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/6654/6003
Copyright (c) 2016 Jurnal Eksakta
oai:ojs.jurnal.uii.ac.id:article/7432
2018-10-22T14:30:50Z
Eksakta:ART
An Alternative Forecasting Using Holt-Winter Damped Trend for Soekarno-Hatta Airport Passenger Volume
Primandari, Arum Handini
holt-winter
holt-winter damped trend
trust-region-reflective algorithm
Located in the capital city of Indonesia, Soekarno-Hatta Airport is considered as the main airport. Since there are some aviation companies providing low cost flight, the number people coming and leaving trough this airport has increased. The passenger volume can be considered as seasonal data since it shows increment in particular months, such as long holiday. Knowing in advance the volume of passenger will help the government to improve its service effectively. There is a simple and accurate method for forecasting seasonal data that is called Holt-Winter Exponential Smoothing (HWE). However, HWE always encounters over forecasting problem when it is employed to forecast in some future periods (m>1). In order to solve this problem, we add the damped parameter that will be damping the exponentially growth on HWE. This method called HWE damped trend. We employed the domestic passenger volume data of Soekarno-Hatta Airport from January 2008 till December 2015. This data collected from prior research. As the result, HWE damped trend outperforms traditional HWE on either training data set or testing data.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-02-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/7432
10.20885/eksakta.vol17.iss1.art1
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 1, February 2017; 1-10
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/7432/6485
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/7433
2018-10-22T14:41:43Z
Eksakta:ART
Utilization of Coal Bottom Ash a Low-Cost Adsorbent for the Removal Acid Red 114 Dye
Kuntari, Kuntari
Aprilita, Nurul Hidayat
Suherman, Suherman
coal bottom ash
acid red 114 and adsorption
A research about adsorption of acid red 114 using coal bottom ash has been conducted. This research was aimed to examine the ability of coal bottom ash in acid red 114 adsorption. Some adsorption parameters i.e. dosage adsorbent, contact time and pH medium were examined in the adsorption processes. The characterization of coal bottom ash was determined using X-Ray Diffraction. Acid red 114 concentration is measured by using UV-Visible spectrophotometer. The adsorption percentage of acid red 114 on the coal bottom ash is 91.2% at pH 1.5; contact time 80 min, acid red 114 concentration 10 mg/L for every 1.5 g bottom ash.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-02-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/7433
10.20885/eksakta.vol17.iss1.art2
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 1, February 2017; 11-19
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/7433/6513
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/7454
2018-10-22T14:21:39Z
Eksakta:ART
The Implementation Of Apriori Algorithm And Chi-Square Test In Determining Pattern Of Relationship Among The Rawi Hadis
Yotenka, Rahmadi
Data Mining
Association Rule Mining
Apriori Algorithm
Chi square Test
Shahih Hadis of Bukhari
Rawi Hadis.
In this research apriori algorithm was implemented on rawi data of hadits to find out pattern of relationship among the rawi hadits in shahih bukhori book. The analogy that can be compared is by assuming that series or chain of rawi in every sanad of hadis may be regarded as transaction, while rawi hadis were items in transaction. Data mining is the method that was used to analyze with association rule technique. Association rule technique is used to find a pattern rule between a combination of items. To find out association rule by using association rule application, it is used apriori algorithm by observing three important measurement, namely support, confidence, and lift values. The analysis result of apriori algorithm showed that for minimum support 0.03 and minimum confidence 0.9 having 9 strong association pattern based on the sequence of rawi hadis of its sanad. Every rule of association which was strong, then tested by chi-square to prove that the rawis that were in the rule were truly connected or statisticly significance
Fakultas Matematika dan Ilmu Pengetahuan Alam
2016-02-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/7454
10.20885/eksakta.vol17.iss1.art3
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 1, February 2017; 20-32
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/7454/6512
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/7467
2018-10-23T08:59:17Z
Eksakta:ART
Optimization of Transportation Cost Using Genetic Algorithm
Kusumawardani, Rizky
optimization
transportation cost
genetic algorithm
Transportation model is application of linear programming that is used to obtain optimum results from distribution issue, especially for minimize transportation cost. General transportation model requires two stages to obtain optimum results such as initial solution method and optimum solution method. These methods are not effective, because it need two stages. Moreover, selection of initial solution method will distinguish the number of iteration on optimum solution method. Therefore, in this study other method such as genetic algorithm that required one stage was used. Genetic algorithm was chosen as alternative method for transportation issue because this method didn’t need two stages and proved to be nice to solve optimization problems. The goal of this study to got method that more effective between combination of North West Corner (NWC) and Modified Distribution Method (MODI) with genetic algorithm to solved two data transportation issues. Based on results, the combination NWC and MODI was more effective for minimize transportation cost than genetic algorithm for two data that solved in this study
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-03-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/7467
10.20885/eksakta.vol17.iss1.art4
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 1, February 2017; 33-45
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/7467/6514
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/7468
2018-10-23T09:28:11Z
Eksakta:ART
Premium Pricing of Liability Insurance Using Random Sum Model
Kartikasari, Mujiati Dwi
premium
nonlife insurance
random sum
claim frequency
claim severity
compound distribution
Premium pricing is one of important activities in insurance. Nonlife insurance premium is calculated from expected value of historical data claims. The historical data claims are collected so that it forms a sum of independent random number which is called random sum. In premium pricing using random sum, claim frequency distribution and claim severity distribution are combined. The combination of these distributions is called compound distribution. By using liability claim insurance data, we analyze premium pricing using random sum model based on compound distribution
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-03-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/7468
10.20885/eksakta.vol17.iss1.art5
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 1, February 2017; 46-54
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/7468/6515
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/7590
2018-10-23T09:32:56Z
Eksakta:ART
Application Of Logistic Regression In Analysis Of Factors That Affect Implementation Of Electronic Medical Record
Wicaksono, Agung Purwo
Kariyam, Kariyam
Muhimmah, Izzati
EMR
logistic regression
Banyumas
ICT trends
health care
Electronic Medical Record (EMR) has now become a trend in the world of health care. Lot of obstacles and barriers that interfere implementation of EMR. This paper discussed the eleven factors suspected to affect the implementation of EMR, with a case study hospital in Banyumas. By using logistic regression analysis obtained eight of the eleven factors that significantly affect the implementation of RME. The eight factors are financial factors, Human Resources (HR), the process of changing, psychological factors, legal factors, the time factor, organizational factors, and ICT trends. Technology, infrastructure, and social is a factor that does not significantly affect the implementation of EMR in hospital. ICT trends are new factors that significantly affect the implementation of EMR in hosital.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-03-13
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/7590
10.20885/eksakta.vol17.iss1.art6
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 1, February 2017; 55-65
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/7590/6586
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/7687
2018-06-21T20:23:26Z
Eksakta:ART
Synthesis of Metal and Metal Oxide Nanoparticles Using Plant Extract: a Review
Fatimah, Is
Plant extract
Green synthesis
Nanoparticles
Nanotechnology is an emerging technology and it is related to various applications. Related to nanotechnology development, the use of green chemistry concept, low cost technology and sustainability is a must. Synthesis of nanoparticles using plant extract is a developing technique within the scheme. In this paper, study on metal/metal oxide synthesis and its aspects is presented for describing the potency of natural resources for nanoparticle synthesis within green chemistry approach.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-03-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/7687
10.20885/eksakta.vol17.iss1.art7
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 1, February 2017; 66-85
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/7687/6684
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/7780
2018-09-28T12:55:11Z
Eksakta:ART
Visitor Behavior in the Library of Syiah Kuala University based on Their Visiting Time Duration
Anwar, Samsul
Afriyani, Afriyani
Ula, Putri Shalihatul
Safriana, Isra
Fajri, Ida
Ariska, Reza
Statistika
The main requirements in the application of survival analysis are the starting time and the ending time of an event. Thus, the duration of visiting time in the Library of Syiah Kuala University (Unsyiah) Banda Aceh could be analyzed by using survival analysis. This study obtained primary data through an interview with the visitors of Unsyiah’s library. Total Samples were 105 visitors collected from three different floors of the library that is 35 visitors from each floor. The analysis was divided into two main steps. The first step was estimating the probability distribution of the visit time duration data through graphical analysis. The second step was calculating the probability density function (PDF), cumulative density function (CDF), survival, and hazard function of the data based on the appropriate distribution in the first step.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-09-13
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/7780
10.20885/eksakta.vol17.iss2.art4
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 2, August 2017; 119-136
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/7780/7331
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/7787
2018-06-21T20:23:26Z
Eksakta:ART
Cover
Eksakta, Editor
daftar isi dan salam redaksi
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-04-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/7787
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 1, February 2017
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/7787/6762
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/7788
2018-06-21T20:23:26Z
Eksakta:ART
Appendix
Eksakta, Editor
Indeks Penulis dan Format Penulisan Jurnal Eksakta
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-04-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/7788
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 1, February 2017
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/7788/6763
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/8147
2018-09-28T13:27:11Z
Eksakta:ART
oai:ojs.jurnal.uii.ac.id:article/8273
2018-09-28T13:03:08Z
Eksakta:ART
Application of Electro-Oxidation Method for Treatment of Dye Textile Wastewater Using Stainless Steel Electrode: Study of Electrolyte Concentration Effect to Color Removal
Rua, Jumardin
Fajrin, Mega Maghfirotul
Rohayati, Zaina
Riyanto, Riyanto
electro-oxidation
dye
stainless steel
electrolyte
The increasing number of textile industries has created a new problem of environmental pollution from waste produced. Entering of concentrated wastewater that containing of complex organic compounds to agricultural land and rivers has caused loss to humans or the environment. Treatment of dye textile wastewater by electro-oxidation method using stainless steel electrode has been done. This research consists of several stages: analysis of electrode composition with SEM-EDX, electrolysis of wastewater at variation of electrolyte concentration and analysis of electrolyte concentration effect to color removal percentage of wastewater. The result shows that the electrode composition consisted of iron, chromium, nickel and silica with the main composition of iron in the amount of 72.2%. After electrolysis on variations of electrolyte concentration and analysis of color removal percentage of wastewater, obtained that the largest of color removal percentage on the use of electrolyte concentration of 3% in the amount of 98.81%
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-09-13
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/8273
10.20885/eksakta.vol17.iss2.art6
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 2, August 2017; 147-153
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/8273/7333
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/8311
2018-09-21T11:14:19Z
Eksakta:ART
Solvent Optimization For Genistein Isolation Of “Rotten Tempe†By High Performance Liquid Chromatography Method
Riyanto, Cucun Alep
Soetjipto, Hartati
Genistein is a soy isoflavone that has been known have anticancer properties. The aim of this research is to determine the right combination of solvents to extract isoflavones in rotten tempe and determine the genistein content of the extraction process by the High Performance Liquid Chromatography (HPLC) method. Isoflavone extraction process was done using a mixture of methanol and chloroform solutions. Isoflavone extracts obtained will be analysed using High Performance Liquid Chromatography (HPLC) method to determine the content of genistein. The optimum isoflavone extract was obtained from chloroform:methanol (10:1 v/v) solvent ratio. Where as the highest contents of genistein from the 4th day “rotten tempe†as 26.199 ± 25.146 (mg/g).
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-09-13
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/8311
10.20885/eksakta.vol17.iss2.art3
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 2, August 2017; 111-118
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/8311/7320
https://journal.uii.ac.id/Eksakta/article/view/8311/12381
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/8341
2018-09-28T12:56:55Z
Eksakta:ART
ANTIOXIDANT ACTIVITY OF ETHANOLIC EXTRACT AND FRACTION OF SALAK FRUIT SEEDS ( Salacca zalacca (Gaertn.) Voss. ) USING DPPH (2,2-diphenyl-1-picrylhydrazyl) METHOD
Werdyani, Sista
Jumaryatno, Pinus
Khasanah, Nur
Antioxidant
salak fruit seeds
DPPH
Salak seeds have been developed as a beverage, but there was still a little amount of research that focused on salak seeds. This research was conducted to find out the chemical compounds and the antioxidant activity of ethanolic extract and fraction of salak fruits seeds ( Salacca zalacca (Gaertn.) Voss. ) which have been grown extensively in Sleman Yogyakarta. Extraction was conducted using maceration, followed by fractionation using vacuum liquid chromatography. The identification of the chemical compounds contained in the ethanolic extract and fraction was performed by thin layer chromatography method, while the antioxidant activity was performed by DPPH method. Comparison of antioxidant activity was seen using IC50 values. The results showed that ethanol extract and fraction contained phenol, flavonoid, and tannin. The largest antioxidant activity was found in F7 with an IC50 value of 110.16 μg / ml.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-09-13
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/8341
10.20885/eksakta.vol17.iss2.art5
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 2, August 2017; 137-146
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/8341/7332
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/8590
2018-10-23T10:09:43Z
Eksakta:ART
Conversion of Carbon Dioxide to Ethanol by Electrochemical Synthesis Method Using Brass as A Cathode
Ramadan, Septian
Riyanto, Riyanto
conversion
carbon dioxide
electrochemical synthesis
ethanol
brass
optimum conditions
The effect of potential and gas flow rate were investigated to determine the optimum conditions of the electrochemical synthesis process to convert carbon dioxide to ethanol. The conversion process is carried out using a NaHCO3 electrolyte solution in an electrochemical reactor equipped with a cathode and anode. As cathode is used brass, while as anode is used carbon. The result of the electrochemical synthesis process was analyzed by gas chromatography to determine the content of the compounds produced qualitatively and quantitatively. The optimum electrochemical synthesis conditions to convert carbon dioxide to ethanol are potential and gas flow rate are 3 volts and 0.5 L/minutes with ethanol concentration yielded 1.32%.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-09-13
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/8590
10.20885/eksakta.vol17.iss2.art1
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 2, August 2017; 86-97
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/8590/7317
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/8609
2018-09-28T14:05:12Z
Eksakta:ART
Extraction and Chemical Compounds Identification of Red Rice Bran Oil Using Gas Chromatography – Mass Spectrometry (GC-MS) Method
Hartono, Hoo Sheren
Soetjipto, Hartati
Kristijanto, A. Ign.
Red Rice Bran
Red Rice Bran Oil
Physico-Chemical Properties
GC-MS
Chemical Compounds
The objectives of the study are to obtain optimum yield of extraction red rice bran oil, to determine the physico-chemical characteristics, and componen coumpounds. Data was analyzed using Nir Parametric Statistics by Friedmann test. The result showed the optimum extraction results was obtained by the ratio of substrate : solvent of 1: 8 and the oil yield was 12.31 ±0.325%. The physico properties of red rice bran oil were greenish brown colour, with a density ranged from 0.908 ± 0.014 to 0.922 ± 0.014 (g/mL), and the water content ranged from 0.87 ± 0.06 to 0.91 ± 0.02 %. The chemical properties of red rice bran oil were: the acid number ranged from 116.41 ± 1.22 to 118.11 ± 2.45 (mg NaOH/g); the saponification number ranged from 193.74 ±21.88 to 199.62 ± 12.63 (mg KOH/g); and the peroxide number ranged from 24.37 ± 2.44 to 26.07 ± 4.88 (mgek/kg), respectively. Oils was analyzed used GC-MS. The chemical components of rice bran oil are oleic acid (46.24%), palmitic acid (18.25%), linoleic acid (13.29%), 9-octadecane(7.76%).
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-09-13
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/8609
10.20885/eksakta.vol17.iss2.art2
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 2, August 2017; 98-110
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/8609/7318
https://journal.uii.ac.id/Eksakta/article/view/8609/12380
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/8614
2018-06-21T20:23:11Z
Eksakta:ART
Cover
Eksakta, Editor
Cover dan halaman depan
Fakultas Matematika dan Ilmu Pengetahuan Alam
2017-09-13
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/8614
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 17, ISSUE 2, August 2017
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/8614/7334
Copyright (c) 2017 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/8621
2019-05-03T14:47:03Z
Eksakta:ART
Formulation and Evaluation of Kaptopril Tablets Using Threaded Amylum Tubes and HPMC as Fillers and Binders of the Direct Method
Kelana, Ahmad Sastra
Kusuma, Aris Perdana
Indrati, Oktavia
Tablet
Kaptopril
Ko-Proses
Pregelatinasi Parsial
Indonesia is a tropical country which has many potential plants as excipients, likestarches and tubers. Amylum of taro tuber (Colocasia esculenta) has the potential to be developed into excipient but its use is limited. The purpose of this study was to optimize the formulation and to evaluate the characteristics of captopril tablets by using amylum of taro tuber and HPMC modified as filler and binder on direct compression method. Amylum of taro tuber was obtained by extraction process, then combined with HPMC by partial pregelatination and co-process method. Variation of the starch was divided into five formulation. The main test included friability test, hardness test, dissolution test, and assay. The data analysis was done by theoretical approach between the evaluation result and the literature to observe the result of the modification formulation. It indicated that the combination of equal amount of taro amylum and microcrystalline cellulose (MCC) pH 102 (50% : 50%) has the best result among others. Friability percentage was 0.17 ± 0.07%, disintegration time was 12.09 ± 0.52 minutes, assay was 97.88 ± 1.71% and dissolution test results was 90.65 ± 4.81%.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2018-03-20
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
application/msword
https://journal.uii.ac.id/Eksakta/article/view/8621
10.20885/eksakta.vol18.iss1.art2
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 18, ISSUE 1, February 2018; 8-18
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/8621/pdf
https://journal.uii.ac.id/Eksakta/article/view/8621/12382
Copyright (c) 2018 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/8646
2019-05-03T14:48:08Z
Eksakta:ART
Determination of Phytochemical Compounds (Tannins, Saponins and Flavonoids) as Quercetin In Inggu Leaf Extract (Ruta angustifolia L.)
Noer, Shafa
Pratiwi, Rosa Dewi
Gresinta, Efri
Kimia
Fitokimia
flavonoid
Empirically, Inggu leaves (Ruta angustifolia L.) has potential to be used as raw material of traditional medicine because it contains phytochemical substances. The main organ most widely used as a traditional medicine is its leaves. Phytochemical compounds contained in the leaves of inggu include quercetin, tannin and saponins. Quercetin is a class of flavonol compounds (part of flavonoids). Quercetin has the ability to prevent the oxidation process from low density lipoprotein (LDL) by capturing free radicals and inhibiting transition metals, so that quercetin is believed to protect the body from various degerative diseases. While flavonoids are compounds consisting of 15 carbon atoms thatact as plant pigments. The function of flavonoids is to protect the cell structure, increase the effectiveness of vitamin C, antiinflammatory and as an antibiotic. While saponin and tannin are a group of active compounds of plants that have a sense of bitter and have antibacterial activity. This study was aim to determine the number of quercetin, tannins and saponins contained in the inggu’s leaves. Preparation of inggu leaf sample was done by maceration extraction technique used 96% ethanol solvent. Analysis of tannin and quercetin levels was determined by UV-Visible Spectrophotometry at 725 nm wavelength (λ).While the analysis of saponin content using TLC Scanner at 301 nm wavelength (λ). The results showed that content of quercetin was 1.67%; saponins 2.13% and tannins 7.04%.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2018-03-20
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/8646
10.20885/eksakta.vol18.iss1.art3
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 18, ISSUE 1, February 2018; 19-29
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/8646/pdf
Copyright (c) 2018 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/8763
2019-05-03T14:44:23Z
Eksakta:ART
An Investigation of Insect Ovipositing Repellent Activity of Andrographis paniculata Ness, Acacia auriculiformis and Piper betle Linn Leaves Extracts to Batrocera carambolae
Prakoso, Nurcahyo Iman
Azizah, Umul
Zakiyah, Zahrah Nur
Nita, Mila Tria
Liyanita, Arida
Suputa, Suputa
MIPA
Kimia
Eksakta
Batrocera carambolae was one of the main pests in some types of fruits. This pest attack resulted in quantitative damage in the form of fall of young fruit and qualitatively in the form of fruit to rot and contains maggots. This research was conducted to determine selected extract from Andrographis Paniculata Ness, Piper betle Linn and Acacia auriculiformis leaves which have repellent activity for Batrocera carambolae. Nine extracts from the maceration process of the three leaves were evaluated by placing the extracts and flies together in the cage. The ethanol, ethyl acetate, and n-hexane extracts from Andrographis Paniculata Ness, Piper betle Linn and Acacia auriculiformis leaves were applied to the test pieces and fed into a cage containing 10 male and female flies. From observation, N-hexane extracts from Andrographis Paniculata Ness and Piper betle Linn leaves and ethyl acetate extracts from Acacia auriculiformis leaf  having good activity as repellent and potentially to be used as a insect ovipositing repellent of Batrocera carambolae.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2018-03-20
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/8763
10.20885/eksakta.vol18.iss1.art1
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 18, ISSUE 1, February 2018; 1-7
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/8763/pdf
Copyright (c) 2018 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/8921
2018-06-26T09:57:32Z
Eksakta:ART
oai:ojs.jurnal.uii.ac.id:article/9753
2019-05-03T14:51:10Z
Eksakta:ART
The Bactericidal and Antibiofilm Activity of Stem Bark of Jatropha multifida L. Against Staphylococcus aureus and MRSA
Fitria, Annisa
Jatropha multifida L.
time-kill assay
antibiofilm
Chronical wound often caused by bacteria which has antibiotic resistance characteristic and presence of biofilm formation. This study aims to evaluate the bactericidal and antibiofilm activity of stem bark of Jatropha multifida L. against Staphylococcus aureus and MRSA (Methicillin-Resistant Staphylococcus aureus), as alternative antimicrobial agents. Examination of bactericidal activity of the extract was performed by time-kill assay to determine the speed of the extract to eradicate bacteria. The inhibitory activity of extract toward biofilm production was quantified using spectrophotometric method. The extract showed bactericidal activity which can be achieved at 8 hours and 12 hours against Staphylococcus aureus and MRSA in MBC value of 0.5 mg/mL and 1 mg/mL. The extract exhibited antibiofilm activity which indicates by its IC50 value of 0.3 mg/mL and 0.76 mg/mL against Staphylococcus aureus and MRSA. These experiments have shown the potential of the extract of  Jatropha multifida L. stem bark as a bioactive substance in a topical agent for chronical skin infection. Â
Fakultas Matematika dan Ilmu Pengetahuan Alam
2018-03-20
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/9753
10.20885/eksakta.vol18.iss1.art5
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 18, ISSUE 1, February 2018; 42-55
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/9753/pdf
https://journal.uii.ac.id/Eksakta/article/view/9753/12415
Copyright (c) 2018 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/9761
2019-05-03T11:04:31Z
Eksakta:ART
Analysis of Factors Affecting the Human Development Index in West Kalimantan Province using Data Panel Data Regression
Humaira, Uray Hety
Nugraha, Jaka
Eksakta
MIPA
Statistika
Development in the country is growing including in the West Borneo Province. However in 2015, the achievement of human development at the National level is quite low, while the District and City varied considerably. Human Development Index is one of the parameter for human development that are affected by many factors. In this paper, analysis for identify the factors for human development index in West Kalimantan Province by using Regression Analysis was conducted. Regression was based on time series data from 2012 until 2015. It is found that Fixed Effect Model is the best regression model with the R2 of 0.99853%. The influencing variables are Life Expectancy (AHH), Adjusted Per Capita (Expenditure), School Average (RLS), School Expectation (HLS), and Gross Regional Domestic Product at Constant Price (GRDP).
Fakultas Matematika dan Ilmu Pengetahuan Alam
2018-09-17
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/9761
10.20885/eksakta.vol18.iss2.art2
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 18, ISSUE 2, August 2018; 97-105
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/9761/pdf
https://journal.uii.ac.id/Eksakta/article/view/9761/12416
Copyright (c) 2018 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/9777
2019-05-03T14:53:53Z
Eksakta:ART
Survival Analysis of Child Patient Diarrhea Using Kaplan Meier Method and Rank Log Test
Muhajir, Muhammad
Palupi, Yayi Diyah
Diarrhea being one of public health problems that important because it is third major contributor the pain children in various countries including indonesia. This research using data from islam hospital medical record jakarta in january 2017 shows that diarrhea cases were occupying the highest rank of various types of disease in patients children, using indicators long healed patients , the age of , andsex. Methods used to determine function survival who dominated in patients children are Kaplan Meier and Log Rank. The results of the analysis method kaplan meier got that patients male had the probability of healed longer than for patients female as well as patients age of 6- 11 years had the probability healed longer than the age of ≤ 5 years. To Log Rank test got that there is no significant difference between the survival function based on sex and age patients.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2018-04-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/9777
10.20885/eksakta.vol18.iss1.art8
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 18, ISSUE 1, February 2018; 74-84
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/9777/pdf
Copyright (c) 2018 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/9825
2019-05-03T15:35:50Z
Eksakta:ART
Estimation of Exponential Smoothing Parameter on Pesticide Characteristic Forecast using Ant Colony Optimization (ACO)
Rahmalia, Dinita
Parameter estimation
Ant Colony Optimization
Exponential Smoothing
Pest in agriculture can raise plant disease and fail to harvest. The pest problem in agriculture can be solved by using pesticide. Pesticide usage must be done proportionally. So, the manufacturer should fix standard pesticide active ingredient in pesticide production. Forecast is a prediction of some future evens. In forecast problem, there are any parameters which should be determined. Parameters can be estimated by exact method or heuristic method. Ant Colony Optimization (ACO) is inspired from the cooperative behavior of ant colonies, which can find the shortest path from their nest to a food source. In this research, we use heuristic method like ACO to estimate exponential smoothing parameter on pesticide active ingredient forecast and pesticide sample weight forecast. From the simulation, on the first iteration, all ants choose parameter randomly. At the optimization process, we update pheromone until all ants choose the similar parameter so that process converges and variance approaches to zero. The optimal exponential smoothing parameter can be applied in forecasting with minimum sum of squared error (SSE).
Fakultas Matematika dan Ilmu Pengetahuan Alam
2018-03-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/9825
10.20885/eksakta.vol18.iss1.art6
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 18, ISSUE 1, February 2018; 56-63
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/9825/pdf
Copyright (c) 2018 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/9947
2019-06-21T11:02:29Z
Eksakta:ART
Completeness of Sequence Spaces Generated by an Orlicz Function
Khusnussaadah, Nur
Supama, S.
Convergence Sequence
Orlicz Function
Sequence Space
Orlicz Sequence Space
In this paper, we discuss about completeness property of Orlicz sequence spaces defined by an Orlicz function. Orlicz sequence space is generalization of p-summable sequence space, for every which is also an Orlicz sequence space. Based on the property of convergence sequence on norm space, we define $\Phi$-convergence sequence on Orlicz sequence space. Moreover, we define $\Phi$-Cauchy sequence and $\Phi$-complete on Orlicz sequence space. In this paper, we show the relationship between the (ordinary) convergent sequence, $\Phi$-convergent and $\Phi$-Cauchy sequences. Finally, it will also be shown that Orlicz sequence space is Banach space and $\Phi$-complete space.
Fakultas Matematika dan Ilmu Pengetahuan Alam
2019-01-31
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/9947
10.20885/eksakta.vol19.iss1.art1
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 19, ISSUE 1, February 2019; 1-14
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/9947/pdf
Copyright (c) 2019 Eksakta: Jurnal Ilmu-Ilmu MIPA
oai:ojs.jurnal.uii.ac.id:article/9969
2019-06-21T11:02:29Z
Eksakta:ART
Effect of Adding Aspergillus niger Mushroom on Patchouli Fermentation Process
Pawestri, Alivia Maulidina
Fitri, Noor
Patchouli alcohol
A. niger
Water bubble distillation
Indonesia is one of the biggest exporter country for essential oils in the world. One of Indonesia's essential oil export commodities is patchouli oil. Almost 90% of the world’s patchouli oil are exported from Indonesia. Various studies to improve the quality of Indonesian patchouli oil were carried out. In this research, the process of fermentation of patchouli raw material was conducted to enhance the quality of patchouli oil. Patchouli fermentation was carried out using A. niger. Preparation processes were carried out prior to distillation including withering, size reducing and fermenting. Patchouli was withered for 24 hours. Patchouli was cut into pieces and weighed as much as 800 grams (3 leaves: 1 stem) after withered. Patchouli fermentation was conducted anaerobically for 20 hours. Varying the addition of A. niger used was 5 mL, 10 mL, 15 mL and 25 mL mixed in 400 mL of distilled water. The amount of A. niger colonies was 8.8 x 105 /mL. Extraction of patchouli oil was performed by water bubble distillation. The chemical and physical properties of the patchouli oil were analyzed and compared to the quality standard of patchouli oil according to SNI 06-2385-2006. Chemical compound of patchouli oil was identified using GC-MS. The main compound of the patchouli oil is patchoulol. The GC-MS result indicates that patchoulol content increases with the increasing addition of A. niger. The content of patchoulol was detected up to 93.75 %w/w in patchouli oil. The optimal concentration of A. niger is 1.875% that produces the highest patchoulol content with an increase of up to 194.6 % compared to those of without A. niger (J0).
Fakultas Matematika dan Ilmu Pengetahuan Alam
2019-01-31
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
application/pdf
https://journal.uii.ac.id/Eksakta/article/view/9969
10.20885/eksakta.vol19.iss1.art2
EKSAKTA: Journal of Sciences and Data Analysis; VOLUME 19, ISSUE 1, February 2019; 15-25
2720-9326
2716-0459
eng
https://journal.uii.ac.id/Eksakta/article/view/9969/pdf
Copyright (c) 2019 Eksakta: Jurnal Ilmu-Ilmu MIPA
aea5d7c73d16d9c94634ede0d4cf5712