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Reni Ambarwati
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Jurusan Biologi, Fakultas Matematika dan Ilmu Pengetahuan Alam Gedung D1 Kampus UNESA Ketintang Surabaya Kode Pos 60213 E-mail: sainsmatematika@unesa.ac.id Telp : 031-8280009
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Sains & Matematika
Published by Universitas Negeri Surabaya
ISSN : 23027290     EISSN : 25461835     DOI : -
Core Subject : Science, Education,
Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics
Jurnal ini menerbitkan artikel asli hasil penelitian di bidang biologi, fisika, kimia, dan matematika. Redaksi hanya menerima naskah asli yang belum pernah dipublikasikan dan tidak sedang dalam proses penerbitan di jurnal lain. Naskah dapat ditulis dalam bahasa Indonesia, sesuai dengan ejaan yang baik dan benar atau bahasa Inggris yang baik dan benar.
Arjuna Subject : Umum - Umum
Articles 5 Documents
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Search results for , issue "Vol. 2 No. 1 (2013): Oktober, Sains " : 5 Documents clear
Sintesis Tris(Thiophen)n-butil Germanium melalui Reaksi Arilasi Senyawa Thiophen dengan n-butil Germanium Aldes Lesbani; Risfidian Mohadi
Sains dan Matematika Vol. 2 No. 1 (2013): Oktober, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

The arylation of 2-iodo thiophene and 3-iodo thiophen with n-butyl germanium using complex palladium as catalyst in argon atmospheric condition was carried out. Products of arylation were tris(2-thiophene)n-butil germanium (1) and tris(3-thiophene)n-butil germanium (2). Compounds (1) and (2) were characterized using GC-MS, 1H and 13C NMR. The results showed that compounds (1) and (2) were colorless oil with the yield 20% and 25%, respectively. Both (1) and (2) have m/z 380. Measurement using 1H NMR gave different peaks of proton equivalent between (1) and (2) while 6 equivalent protons in (1) and 7 equivalent protons in (2). The measurement using 13C NMR gave 8 equivalent carbons both for compound (1) and (2).
Aplikasi Pupuk Hayati Illetrisoy pada Tanaman Kedelai dan Pengaruhnya terhadap Populasi Mikroba Tanah Prihastuti Prihastuti
Sains dan Matematika Vol. 2 No. 1 (2013): Oktober, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

Illetrisoy is a biological fertilizer for soybeans, improvised by Indonesian Legume and Tuber Crops Research Institute, consisting in two forms of formulations A and B. This study aimed to determine the benefits of Illetrisoy bio-fertilizer application on growth and seed yield, as well as its effect on soil microbial populations.� � � � � � � � � � The research was conducted at the Indonesian Legume and Tuber Crops Research Institute, using of biological fertilizers Illetrisoy and soybean Grobogan variety. Design of the experiment used was a factorial randomized block with six replications. The first factor was the manure application consists of (1) without any manure, and (2) given manure. The second factor is giving inoculant Illetrisoy, consisting of (1) without inoculant, given inorganic fertilizer P, K, (2) without inoculant, given inorganic fertilizer N, P and K, (3) inoculation Illetrisoy A, and (4) inoculation Illetrisoy B. The results showed that the application of bio-fertilizers Illetrisoy on soybean has not significant effect on the physical variability of plants 45 days after planting and seed yield, compared to the treatment of manure and NPK application. The highest seed yields achieved on the application of Illetrisoy B accompanied with the application of manure and NPK fertilizer reached 50% (19.20 g seed/plant), which is not significantly different from the standard cultivation with application of NPK fertilizers which reached 18.43 g seed / plant. The analysis of the soil before and after soybeans planted, showed an improvement of chemically and biologically soil properties in terms of nutrient content (especially N and K) and total soil microbial population up to a hundred times.
Karakterisasi Sifat Listrik dan Magnetik PANI/HCl/Fe3O4 akibat Penambahan Fe3O4 pada Komposit PANI/HCl Purwanto Purwanto; Diah Hari Kusumawati
Sains dan Matematika Vol. 2 No. 1 (2013): Oktober, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

Fabrication PANi/HCl has been carried out by interfacial polymerization method, Fe3O4 nanoparticles by coprecipitation method and composite with compacting method. In the manufacture of composites, the addition of Fe3O4 nanoparticles aims to improve the electrical properties and characteristics of the magnetic properties of the composite PANi/HCl/Fe3O4. Characterization was conducted on the electrical conductivity measurements, characterization of XRD and VSM. Characterization results in this study could be seen that with the addition of Fe3O4 in PANi/HCl/Fe3O4 the electrical conductivity decreases significantly with increasing addition of Fe3O4. The maximum electrical conductivity of PANi/HCl at 16,667 S/cm decreased with the highest reduction at 40% Fe3O4 with a value of 21.1 × 10-4 S/cm. With the addition of Fe3O4 nanoparticles of the magnetic properties PANi/HCl in PANi/HCl/Fe3O4 composites increased significantly with increasing addition of Fe3O4 nanoparticles. The enhancement magnetic properties was shown by the increasing value of saturation magnetization (Ms) PANi/HCl in the composite PANi/HCl/Fe3O4. For the PANi/HCl with a value of Ms = 25.48 × 10-4 emu/cm3 experienced the highest increase in the addition of 40% Fe3O4, that is the value of Ms = 18.5 emu/cm3.
Pengujian Parametrisasi Baru Potensial Woods-Saxon dengan Perhitungan Spektrum Tenaga Keadaan Dasar Inti Pb208 Raden Oktova
Sains dan Matematika Vol. 2 No. 1 (2013): Oktober, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

Single-particle and single-hole energy levels in the nucleus Pb208 are calculated using a new parametrization of the Woods-Saxon potential in coordinate space and the Numerov algorithm. The application of the new parameter set proves to be capable of improving the accuracy of the calculation compared to a previous parameter set as measured from the energy standard deviation (relative to the experimental values) only for single-particle levels, but it fails for single-hole levels.
Lemma Henstock untuk Suatu Fungsi Bernilai Vektor di dalam Ruang Metrik Kompak Lokal Manuharawati Manuharawati
Sains dan Matematika Vol. 2 No. 1 (2013): Oktober, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

Based on an interval system S in a locally compact metric space, we have a cell in a locally compact metric space, i.e. an interval compact in S. In addition, if a cell E and a function d : E ® R+ are given, we have proven the exsistence of Perron d ® fine partition on E. Using a Perron d ® fine partition on a cell E, we can contruct a Henstock integral of a real valued function in a locally metric space nondiscrete. By generalizing a range function of its function, i.e. from a set of all real numbers to a vector space, we can construct a Henstock integral of a vector valued function on a cell in locally metric space nondiscrete. This research used a method of literature study, which was done by examining relative integral theories, building new concepts and proving theorems using logical mathematic reasoning as well as right calculation.

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