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Zahrah Nur Zakiyah
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eksakta@uii.ac.id
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INDONESIA
Jurnal Eksakta: Jurnal Ilmu-Ilmu MIPA
ISSN : 14111047     EISSN : 25032364     DOI : -
Ekstakta is an interdisciplinary journal with the scope of mathematics and natural sciences that is published by Fakultas MIPA Universitas Islam Indonesia. All submitted papers should describe original, innovatory research, and modelling research indicating their basic idea for potential applications. The Journal particularly welcomes submissions that focus on the progress in the field of mathematics, statistics, chemistry, physics, biology and pharmaceutical sciences.
Arjuna Subject : -
Articles 112 Documents
Characterization And Composition Liquid Smoke-charcoal-compost Bamboo Sawdust As Natural Pesticide Mohammad Wijaya M
Jurnal Eksakta Vol 11, No 2 (2010)
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Abstract

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.
Analisis Perubahan Kawasan Mangrove Berdasarkan Interpretasi Data Spasial Di Tn. Sembilang, Pantai Timur Sumatera, Banyuasin, Sumsel Yetty Hastiana; Fachrurrozie Sjarkowi; Dwi Anugrah; Rasjid Ridho
Jurnal Eksakta Vol 11, No 2 (2010)
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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.
Identifikasi dan Estimasi Runtun Waktu Model AR Menggunakan Algoritma Simulated Annealing Abdul Taram; suparman suparman
Jurnal Eksakta Vol 11, No 2 (2010)
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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.
Penentuan Efisiensi Immobilisasi Kromium (VI) Pada Geopolimer Abu Sekam Padi Dengan Uji TCLP (Toxicity Characteristic Leaching Procedure) Kun Sri Budiasih
Jurnal Eksakta Vol 12, No 1 (2011)
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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
Adsorption Competition between H+ and Cd2+ Ions Toward Active Sites on Ionic Imprinted Mercapto-Silica Hybrid Buhani Buhani
Jurnal Eksakta Vol 12, No 1 (2011)
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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
Effect Of Curcumin And Honey To Pharmacokinetics Of Paracetamol In Male Wistar Rats Dimas Adhi Pradana; Farida Hayati; Agung Giri Samudra; Amalinda Setya Kartika
Jurnal Eksakta Vol 12, No 1 (2011)
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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
Chemical Stability of Cd(II) and Cu(II) Ionic Imprinted Amino-Silica Hybrid Material in Solution Media Buhani Buhani
Jurnal Eksakta Vol 13, No 1 (2012)
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Abstract

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.
Parameter Estimation in Probit Model for Multivariate Multinomial Response Using SMLE Jaka Nugraha
Jurnal Eksakta Vol 12, No 1 (2011)
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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
Model of Community Capacity In Facing Disaster Using Ordinal Logistic Regression Analysis Nugraha, Jaka; Nugraheni, Fitri; Kurniawan, Irwan Nuryana
Eksakta: Jurnal Ilmu-Ilmu MIPA VOLUME 16, ISSUE 1, February 2016
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol16.iss1.art3

Abstract

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.
Air Pollution Simulation From Cirebon Power Plant Activity Muhaimin, Muhaimin; Sugiharto, Eko; Suratman, Adhitasari
Eksakta: Jurnal Ilmu-Ilmu MIPA VOLUME 15, ISSUE 1-2, 2015
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol15.iss1-2.art2

Abstract

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.

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