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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 7 Documents
 1 
Search results for , issue "VOLUME 16, ISSUE 1, February 2016" : 7 Documents clear
Metode Improved CHAID (chi-squared automatic interaction detection) Pada Analisis Kredit Macet BMT (Baitul Mal wa Tamwil) Muhammad Muhajir
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.art7

Abstract

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.
A Highly Sensitive Electrochemical Glucose Sensor By Nickel-Epoxy Electrode With Non-Enzymatic Sensor Riyanto Riyanto
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.art1

Abstract

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.
Optimation Of Ethanol Extract Of Centella Asiatica And Cresintia Cujete Composition As Natural Antioxidant Source Mustofa Ahda; Fiqrirozi Fiqrirozi; Gina Noor Habibah; Mas Ulfah Lestari; Tomy Hardianto; Yuni Andriani
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.art2

Abstract

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.
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.
Film Of Chitosan-Carboxymethyl Cellulose Polyelectrolyte Complex as Methylene Blue Adsorbent Febi Indah Fajarwati; Eko Sugiharto; Dwi Siswanta
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.art5

Abstract

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.
Study on Lignin Isolation from Oil Palm Empty Fruit Bunches Nurcahyo Iman Prakoso; Suryo Purwono; Rochmadi Rochmadi
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.art6

Abstract

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
Kinetics Study Of Au(Iii) Adsorption On Gallic Acid Intercalated Mg/Al-Hydrotalcite Ika Yanti; Sri Juari Santosa; Indriana Kartini
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.art4

Abstract

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.

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