EKSAKTA: Journal of Sciences and Data Analysis
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.
Articles
231 Documents
<![CDATA[Characterization And Composition Liquid Smoke-charcoal-compost Bamboo Sawdust As Natural Pesticide ]]>
<![CDATA[Mohammad Wijaya M]]>
<![CDATA[ EKSAKTA: Journal of Sciences and Data Analysis VOLUME 11, ISSUE 2, August 2010 ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam ]]>
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<![CDATA[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.]]>
<![CDATA[Koordinasi Running Text Display Led Berbasis Android ]]>
<![CDATA[Zaenal Arifin]]>;
<![CDATA[Safrizal Safrizal]]>
<![CDATA[ EKSAKTA: Journal of Sciences and Data Analysis VOLUME 19, ISSUE 2, August 2019 ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam ]]>
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DOI: 10.20885/eksakta.vol19.iss2.art10
<![CDATA[Media penyampaian informasi running text merupakan suatu inovasi yang menarik dalam perkembangan teknologi informasi saat ini. Informasi yang disampaikan pada umumnya diterima melalui berita dengan tulisan yang ditulis pada media cetak, internet dan lain-lain yang terkadang ada kejenuhan dalam membaca. Hal ini dapat menyebabkan informasi yang diterima oleh pengguna tidak akurat karena adanya keraguan saat informasi diterima dan mengurangi ketertarikan untuk membaca informasi. Running text yang beredar saat ini dengan kontrol komputer kadang terkendala pada ketersediaan PC saat mengontrol dan device sinkronisasinya yang harus ada untuk bisa mensetting running text sesuai input yang dimasukkan oleh user. Kecepatan transfer informasi sangat berpengaruh terhadap output, melalui teknologi android saat ini yang sudah canggih dimanfaatkan untuk control running text yang up to date, relatif lebih aman dan ramah lingkungan pada pemakaian dengan control led tipe TF-S6UW yang memiliki kemudahan dalam acces data pada android, kecepatan dan karakteristik text. Berdasarkan hasil penelitian, dengan output karakter i yang ditampilkan pada papan running text mulai 1 sampai dengan 25 karakter diperoleh besar nilai tegangan yang stabil pada 12 Vdc, dan nilai arus yang semakin bertambah sesuai dengan banyaknya dot led yang menyala mulai dari 1 Adc sampai dengan 2,1 Adc.]]>
<![CDATA[Isolation And Identification Of Antioxidant Compounds Leaf Betel Seating (Piper sarmentosum Roxb. Ex Hunter) ]]>
<![CDATA[Hartiwi Diastutia]]>;
<![CDATA[Eva Vaulina Yulistia Delsy]]>
<![CDATA[ EKSAKTA: Journal of Sciences and Data Analysis VOLUME 11, ISSUE 2, August 2010 ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam ]]>
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<![CDATA[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.]]>
<![CDATA[A Comparison between Nonparametric Approach: Smoothing Spline and B-Spline to Analyze The Total of Train Passangers in Sumatra Island ]]>
<![CDATA[Drajat Indra Purnama]]>
<![CDATA[ EKSAKTA: Journal of Sciences and Data Analysis VOLUME 1, ISSUE 1, February 2020 ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam ]]>
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DOI: 10.20885/EKSAKTA.vol1.iss1.art11
<![CDATA[The train is one of the means of land transportation of the most desirable communities other than ground transportation such as bus or car. This is because the rail has an advantage that is free from congestion. Increasing mobility of people, means of transportation that is free from congestion increasingly in demand. In Indonesia, the only railway in Java and Sumatra. Either in Java or Sumatra Island train passenger numbers have increased every year. Based on data from BPS-Statistics, the number of train passengers in Sumatra during the last five years has increased an average of 14.8 percent per year. Noparametric regression model that can be used to describe the pattern of data on the number of train passengers in Sumatra Island is smoothing spline regression and B-spline regression. The purpose of this study is to find the most nonparametric regression model to describe the pattern of the relationship between the time and number of train passengers on Sumatra Island. Smoothing spline and B-spline models were compared by looking at the regression curve and the value of Mean Square Error (MSE). The results of this study indicate that smoothing spline model is more appropriate to see the pattern of the relationship between the time and number of train passengers in Sumatra Island. This can be seen from the MSE of smoothing spline models 2,742.801 smaller than the MSE of B-spline models 3,847.657.]]>
<![CDATA[Preparation of Chitin, Study of Physicochemical Properties and Biopesticide Activities ]]>
<![CDATA[Yuli Rohyami]]>;
<![CDATA[Reni Banowati Istiningrum]]>
<![CDATA[ EKSAKTA: Journal of Sciences and Data Analysis VOLUME 13, ISSUE 1-2, August 2013 ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam ]]>
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DOI: 10.20885/eksakta.vol13.iss1-2.art6
<![CDATA[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]]>
<![CDATA[Penerapan Regresi Logistik Biner Terboboti Geografi dengan Pembobot Fixed Bi-Square (Geographically Weighted Binary Logistic Regression with Fixed Bi-Square Weight) ]]>
<![CDATA[Tuti Purwaningsih]]>
<![CDATA[ EKSAKTA: Journal of Sciences and Data Analysis VOLUME 15, ISSUE 1-2, 2015 ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam ]]>
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DOI: 10.20885/eksakta.vol15.iss1-2.art5
<![CDATA[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.]]>
<![CDATA[Fuzzy T2 Hotelling (T_f^2 ) Control Chart ]]>
<![CDATA[Ayundyah Kesumawati]]>;
<![CDATA[Mashuri Mashuri]]>;
<![CDATA[Irhamah Irhamah]]>
<![CDATA[ EKSAKTA: Journal of Sciences and Data Analysis VOLUME 14, ISSUE 1, February 2014 ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam ]]>
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<![CDATA[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]]>
<![CDATA[Optimization of Transportation Cost Using Genetic Algorithm ]]>
<![CDATA[Rizky Kusumawardani]]>
<![CDATA[ EKSAKTA: Journal of Sciences and Data Analysis VOLUME 17, ISSUE 1, February 2017 ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam ]]>
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DOI: 10.20885/eksakta.vol17.iss1.art4
<![CDATA[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]]>
<![CDATA[Determination of Phytochemical Compounds (Tannins, Saponins and Flavonoids) as Quercetin In Inggu Leaf Extract (Ruta angustifolia L.) ]]>
<![CDATA[Shafa Noer]]>;
<![CDATA[Rosa Dewi Pratiwi]]>;
<![CDATA[Efri Gresinta]]>
<![CDATA[ EKSAKTA: Journal of Sciences and Data Analysis VOLUME 18, ISSUE 1, February 2018 ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam ]]>
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DOI: 10.20885/eksakta.vol18.iss1.art3
<![CDATA[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%.]]>
<![CDATA[Vaksinasi dan Treatment pada Predator-Prey dengan Dua Jenis Pemangsa yang Salah Satunya Terinfeksi ]]>
<![CDATA[Khozin Mu'tamar]]>;
<![CDATA[Dinita Rahmalia]]>;
<![CDATA[Sutimin Sutimin]]>
<![CDATA[ EKSAKTA: Journal of Sciences and Data Analysis VOLUME 19, ISSUE 2, August 2019 ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam ]]>
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DOI: 10.20885/eksakta.vol19.iss2.art4
<![CDATA[Predator-prey adalah model matematika yang menggambarkan perilaku interaksi dua spesies, satu diantaranya merupakan pemangsa dan satu lainnya sebagai mangsa. Populasi pemangsa biasanya berada di level lebih atas dibandingkan level mangsa pada rantai makanan. Oleh karena itu, populasi pemangsa lebih sedikit dan rentan akan kepunahan baik karena penyakit ataupun kalah persaingan. Pada artikel ini, dikembangkan model predator-prey dengan dua jenis pemangsa dan salah satunya terinfeksi penyakit. Untuk mencegah penyebaran, diberikan tindakan vaksinasi dan pengobatan yang dirumuskan menggunakan Pontryagin Minimum Principle (PMP). Analisis kestabilan dilakukan secara lokal untuk menunjukkan tindakan vaksinasi dan pengobatan berpengaruh terhadap sifat kestabilan. Terakhir, simulasi dilakukan secara numerik guna melihat perilaku model dan performa vaksinasi dan treatment yang diberikan]]>
