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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 231 Documents
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Community Structure of Riparian Community of Sematang Borang River of South Sumatera Yetty Hastiana
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 14, ISSUE 2, August 2014
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol14.iss2.art2

Abstract

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.
Model of Community Capacity In Facing Disaster Using Ordinal Logistic Regression Analysis Jaka Nugraha; Fitri Nugraheni; Irwan Nuryana Kurniawan
EKSAKTA: Journal of Sciences and Data Analysis 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.
The Study of In-Migration between Provinces in Indonesia by Panel Data Regression Asmadhini Handayani Rahmah
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 16, ISSUE 2, August 2016
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol16.iss2.art7

Abstract

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.
Conversion of Carbon Dioxide to Ethanol by Electrochemical Synthesis Method Using Brass as A Cathode Septian Ramadan; Riyanto Riyanto
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 17, ISSUE 2, August 2017
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol17.iss2.art1

Abstract

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%.
Saccharin Extraction And Analysis Of Drug And Food Samples By Derivative Ultraviolet (UV) Spectrophotometry Sarwendah Ratnawati Hermanto; Roto Roto; Agus Kuncaka
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 18, ISSUE 2, August 2018
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol18.iss2.art1

Abstract

Saccharin extraction and analysis of drug and food samples was investegated by spectrophotometry ultraviolet (uv) derivative method were studied. The saccharin extraction was carried out using solvent of ethanol/chloroform (2:8 v/v). The limit of detection (LOD) and limit of quantification (LOQ) of the proposed method were  0.50 ppm and 1.82 ppm for the second order and 0.47 ppm and 1.58 ppm for the fourth, while for the zero order were 2,75 ppm and 8,55 ppm. The calibration curve was linear in the concentration range from 20-100 ppm (R2= 0.996 for the second order and R2=0.997 for the fourth). The percent recovery of saccharin was in the range 95.20-104.40% for the second order and 97.20-102.40% for the fourth. The range of saccharin concentration (w/w) in drugs, candies and toothpaste for the fourth derivative were 1.39±0.02 mg/kg until 7.15±0.05 mg/kg, 0.21±0.01 mg/kg until 2.09±0.01 mg/kg, and 0.15±0.03 mg/kg until 0.63±0.04 mg/kg, respectively. 
Pengaruh Konsentrasi Fosfat Terhadap Perbandingan Ca/P Hidroksiapatit dari Limbah Gipsum Industri Keramik Asep Mufti Kurniawan; Sri Hartini; Margareta Novian Cahyanti
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 19, ISSUE 1, February 2019
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol19.iss1.art5

Abstract

Gypsum waste has the potential to be made into hydroxyapatite (HAp). In this study synthesis of HAp with hydrothermal  method using microwave at heating temperature of 100 ºC was carried out. The purpose of this study was to obtain hydroxyapatite bioceramic compounds from gypsum waste, determine the ratio of Ca/P in obtained HAp and characterizing the obtained HAp. HAp characterization has been carried out using FTIR and XRD. The result showed that 2,5 grams of gypsum powder produced HAp powder yield of 65,61% to 84,43%. Calcium levels are 0,02440 % to 0,03466 %, while phosphate levels are 0,038 % to 0,055 %. The Ca/P ratio are 0,28 to 0,39. FTIR HAp characterization results indicate the presence of phosphate groups (PO43-), hydroxyl groups (OH-), and Ca-O groups. But based on XRD analysis, The HAp obtained is not a standard HAp.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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.
Transesterfication Process of Waste Cooking Oil Catalyzed by Na/CaO Derived from Blood Clam (Anadara Granosa) Shells Edi Kurniawan; Nurhayati Nurhayati
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 1, ISSUE 1, February 2020
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol1.iss1.art1

Abstract

Abstract: Blood clam (Anadara granosa) shells has the potential to be developed as a base heterogeneous catalysts for biodiesel production. Blood clam (Anadara granosa) shells has a high mineral content of calcium carbonate (CaCO3). CaCO3 can be decomposed into CaO at high temperature heating. In this study, CaO catalyst synthesized from the blood clam (Anadara granosa) shells calcined of 900 °C for 10 hours and then impregnated using NaOH (1, 3, and 5% w/w) the activation temperature of 600 °C for 5 hours. 3% Na/CaO catalyst was the most better catalyst with maximum biodiesel results obtained at 83,57% using the 3% Na/CaO catalyst. The maximum conditions obtained from biodiesel production using the 3% Na/CaO catalyst on the reaction temperature at 60 °C, the reaction time of 3.5 hours, stirring speed of 250 rpm, 3 g weight of catalyst, and the mole ratio of oil: methanol 1: 6.Keywords: Biodiesel, Transesterification, Blood clam shells, Heterogeneous base catalystReceived: 29 September 2019; Accepted: 2 December 2019; Published: 15 January 2020
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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
Analysis of Factors Influencing The Decision to Choose The Department in The Natural Science Campus Muhammad Hasan Sidiq Kurniawan; Achmad Fauzan; Jaka Nugraha
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 1, ISSUE 1, February 2020
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol1.iss1.art12

Abstract

Education is very important thing for everyone. Parents tend to choose high-quality school or campus, to ensure their children’s education. One thing which determined parents to choose the campus for their children is the prospect for work. Faculty of Natural Science UII have high-quality department. Some of them already had highest accreditation level and even Internationally accredited. But some peoples in Indonesian often asked about what become of their children after graduated from the faculty of natural science or what is job that suit for their chlidren. The department of that faculty often not become the first choice when choosing campus. Therefore, the research to study about factors which determine people to choose their college department is needed. In this paper, the study is focused on factors which influence people’s decision score to choose the department in the faculty of natural science. We are using correlation and regression analysis. The result show that factors which influence the people’s decision are different between one department with another. Those factor consist of: product, promotion, and the price/cost.

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