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INDONESIA
EKSAKTA: Journal of Sciences and Data Analysis
Published by Universitas Islam Indonesia
ISSN : 27160459     EISSN : 27209326     DOI : 10.20885
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Materials Science & Nanotechnology
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 : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 187 Documents
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Land Suitability Evaluation For Horticultural Commodities At The West Part Of Upland Lawu Puguh Karyanto; Rahayu Rahayu
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 11, ISSUE 2, August 2010
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

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
Analisis Perubahan Kawasan Mangrove Berdasarkan Interpretasi Data Spasial Di Tn. Sembilang, Pantai Timur Sumatera, Banyuasin, Sumsel Yetty Hastiana; Fachrurrozie Sjarkowi; Dwi Anugrah; Rasjid Ridho
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 11, ISSUE 2, August 2010
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

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.
Senyawa Aktif Antiinflamasi dari Kulit Batang Pasak Bumi (Eurycoma longifolia Jack) Ari Widiyantoro; Indri Kusharyanti; Lia Destiarti; Elvi Rusmiyanto Pancaning Wardoyo
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 12, ISSUE 2, August 2011
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

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
Parameter Estimation in Probit Model for Multivariate Multinomial Response Using SMLE Jaka Nugraha
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 12, ISSUE 1, February 2011
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

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
Segmentasi Bayesian Hirarki Untuk Model Ma Konstan Sepotong Demi Sepotong Berbasis Algoritma Reversible Jump Mcmc Suparman Suparman
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 11, ISSUE 1, February 2010
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

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
Evaluasi Unjuk Kerja Alat Spektrofotometer UV-Vis Menggunakan Holmium Oksida dan Kalium Dikromat Thorikul Huda; Cecep Sa'bana Rahmatillah; Yusuf Habibi
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 12, ISSUE 1, February 2011
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

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,
Fuzzy T2 Hotelling (T_f^2 ) Control Chart Ayundyah Kesumawati; Mashuri Mashuri; Irhamah Irhamah
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 14, ISSUE 1, February 2014
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

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
Isolation And Identification Of Antioxidant Compounds Leaf Betel Seating (Piper sarmentosum Roxb. Ex Hunter) Hartiwi Diastutia; Eva Vaulina Yulistia Delsy
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 11, ISSUE 2, August 2010
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

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.
PEMURNIAN, IDENTIFIKASI DAN UJI AKTIVITAS ANTIDIABETES SENYAWA METABOLIT SEKUNDER EKSTRAK ETIL ASETAT DAUN KACA PIRING (Gardenia augusta, Merr) Chasani Mochamad; Hartiwi Diastuti; Rizka Aprilia
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 12, ISSUE 2, August 2011
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

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
Chemical Stability of Cd(II) and Cu(II) Ionic Imprinted Amino-Silica Hybrid Material in Solution Media Buhani Buhani
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 13, ISSUE 1, February 2012
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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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.

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