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Reni Ambarwati
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sainsmatematika@unesa.ac.id
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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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INDONESIA
Sains dan Matematika
Published by Universitas Negeri Surabaya
ISSN : 23027290     EISSN : 25481835     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 213 Documents
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Biokonversi Sampah Organik Pasar Menjadi Biogas Menggunakan Starter Effective Microorganisms (EM4) I Gusti Made Sanjaya
Sains dan Matematika Vol. 1 No. 1 (2012): Oktober, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

Bioconversion of organic waste into biogas has been studied using a variation of effective micro-organisms starter, EM4. Optimum bioconversion resulted in the addition of EM4 9% to produce biogas as much as 328.17 ml. Biogas at optimum bioconversion conditions had the composition of methane gas 61.97% and 36.04% carbon dioxide. 
Optimasi Pelarut Pengembang dalam Pemisahan Benzil Asetat dari Ekstrak Bunga Tanaman Melati Rinaningsih Rinaningsih
Sains dan Matematika Vol. 1 No. 1 (2012): Oktober, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

Jasmine plant flower (Jasminum sambac) have a range of benefits. The compounds of these plants which are useful for medicine are benzyl acetate, acetic acid and indole linalil. The objective of this research was to identify the best developer solvent. Solvents used to identify the developer who is benzene, chloroform, benzene - chloroform (1:1), benzene - ethyl acetate (19:1). Based on the amount of stain on TLC chromatograms and spectral similarity as determined by TLC - Densitometer brand Simatsu type CS - 930, the most appropriate developer solvent to identify the benzyl acetate from the extract of jasmine is chloroform (CHCl3). This is partly because the price matches or see imminent standard polarity of benzyl acetate with chloroform as a developer solvent is better than another developer solvents and mixed solvents other developers. [Index polarity of benzyl acetate = 4.3, benzene = 0, chloroform = 4.4, benzene-chloroform (1:1) = 2.2, benzene - ethyl acetate (19:1) = 0.215]. Hence, it can be concluded that the best developer solvent or mix developers solvent to separate the benzyl acetate from the extract of Jasmine is the developer solvent chloroform. 
Penambahan Fly Ash pada Komposit Polianilin/HCl/Fly Ash Nila Rosana; Nugrahani Primary Putri
Sains dan Matematika Vol. 1 No. 1 (2012): Oktober, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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In this study has been made composite between polyaniline as one of conductive polymers that has good conductivity by using fly ash as consequence getting a new material with a wider application. The aim of this research was to determine the effect of the addition of fly ash on the electrical properties of polyaniline/HCl/fly ash composite. The method of fabrication that we used to get synthesis of polyaniline was chemical oxidation while the composite of polyaniline/HCl/fly ash manufactured by using powder metallurgy, with a composition of 10%, 20%, 30% and 40% fly ash. The composite was tested using FTIR to find polyaniline functional groups, LCR meter (f = 50-106 Hz) to determine the electrical conductivity and dielectric constant of the composite, to find the content of fly ash was tested by using XRF, where as the morphology of the composite was tested by using SEM EDAX. Based on LCRs results, the electrical conductivity increased and dielectric constant decreased. The maximum electrical conductivity of the composite reached on the composition 20% fly ash was 3.86 × 10-6 S/cm. The maximum dielectric constant at 20% fly ash composition reached 2.01 × 104. 
Variasi Molaritas H2SO4 pada Polianilin/H2SO4 Moch. Nur Chomari; Diah Hari Kusumawati
Sains dan Matematika Vol. 1 No. 1 (2012): Oktober, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Synthetis of polyaniline has carried out using oxidation polymerization of aniline monomer to oxidant ammonium peroxydisulfat (NH)4S2O8 and H2SO4 as a source of proton doped. Variations in the molarity of H2SO4 conducted to determine of optimum polyaniline on electrical conductivity. Polyaniline samples were characterized by FTIR to determine the cluster function and the four-point probe method to determine the electrical conductivity. FTIR results showed that the samples were synthesized is polyaniline. Electrical conductivity test by used four point probe method showed higher acid molarity higher the electrical conductivity to the optimum. After reaching the optimum point, the electrical conductivity of polyaniline decreases followed by the molarity increases. Polyaniline has the most optimum conductivity of 1.833 S/cm when synthesized with 0.12 M H2SO4. 
Artificial Intelligence Berbasis Pengetahuan Pemain untuk Real Time Tactic Game Menggunakan Knowledge Based Artificial Neural Networks Muhammad Rofiul Ibad; Moch. Hariadi
Sains dan Matematika Vol. 1 No. 1 (2012): Oktober, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

Solution for the complexity problem of Artificial Intelligence (AI) on Real Time Tactic (RTT) game as one of the real-world simulation game requiresefective control system.Control system is in the form of a representative agent as a human player in anticipating the changes of the game states. In this thesis, control agent is built by applying a Knowledge Based System (KBS) based on the knowledge base related to human player action for goal achievement of the game. The construction of KBS inference is divided into two phases, which isdetermination of the case inlinguistic format of human players from the numerical values of complex states in the game, and selection of the appropriate tactic when a series of cases occur.Existanceof knowledge that is not deterministic as the basis of the inference process, requires adaptability of the agent through weighting system of knowledge and learning. KBS is mapped to Knowledge Base Artificial Neural Networks (KBANN) using certainty factor (CF) based back propagation as learning method. Inference is limited to the process of achieving main goal through controlling of attack and defense. The design of AI system is implemented in RTT Game œThe Cursed through the shared interfaces of SPRING AI Game Engine. Testing against other static AI shows the ability of adaptation to changes in circumstances and improved quality control of the game by 0.017745641. These results fit expectations of human players who expect an improvement of playing quality in each session through the selection of appropriate goal achievement action. 
Bioremediasi Limbah Minyak Bumi dengan Teknik Biopile di Lapangan Klamono Papua Munawar Munawar; Zaidan Zaidan
Sains dan Matematika Vol. 1 No. 2 (2013): April, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

Research of bioremediation of petroleum waste by indigenous petrophilic bacteria with biopile techniques at Klamono Area in Papua has been done. Petroleum waste was derived from various sources, namely tank cleaning, oil spills, oil catcher, leaking pipes, and drilling wastes containing oil residue. Preparation of petroleum waste has been done by adding wood sawdust as a bulking agent as much as 10% (w/w), the ratio of C: N: P: K = 100:5:1; 0.1 and mixed cultures of indigenous petrophilic bacterial isolated from the sources of the waste that has been collected in a storage-pit that Pseudomonas sp. (PSP01), Pseudomonas sp. (PSP05), and Bacillus sp. (PSP03) with 1:1:1 ratio of 0.5% (v/w). During the bioremediation process was aerated at a rate of 1 liter/jam/m3. Monitoring process have been done every week by doing the sampling with multiple sampling method to determine the five stations and each station has determined three sampling points,namelythe surface, middle and bottom based on the depth, samples have been obtained pooled and analyzed. The results showed that a decline in Total Petroleum Hydrocarbon (TPH) of 91.04% for six weeks. Total bacterial populations during bioremediation processes ranging 103 to 108 CFU/gram of soil. In addition at the end of the observation showed that the toxic aromatic compounds benzene, toluene, ethylbenzene, and xylene (BTEX) showed concentrations under the Environmental Quality Standards. Thus, indigenous petrophilic bacteria effective as biological agents in the bioremediation of petroleum waste by biopile method. 
Potensi Tepung Tempe sebagai Estrogen Alami terhadap Uterus Mencit Premenopause Cicilia Novi Primiani
Sains dan Matematika Vol. 1 No. 2 (2013): April, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

Syntetic estrogen hormone is commonly used by women by and in their menopause cycle to overcome the problems related to menopause. Women make use of this syntetic estrogen hormone for a reason that it is easy to get, cheap and its easy application. This syntetic estrogen hormone can eventually result in side-effects. Powder of tempe has become the natural stuff with isoflavon, a chemical blend which is sturcturally fit to estrogen hormone. The objective of this research was to measure the effect of tempe starch towards the endometrium uterus of mice. The research applied experimental approach with completely randomized design with one factor of the dossage of tempe starch by 0.2 g/kg, 0.4 g/kg, and 0.6g/kg. The samples were 24 female mice of 12 months, which were divided into 4 groups of treatment with 6 times of application. The tempe powder was applied for 24 days. Surgery was was done on the 25th day. Histology of uterus was made under colouring technique of Hematoxilin Eosin (HE). The results showed that there were miometrium uterus and uterine gland proliferation. Based on the result, can be concluded that tempe powder can be used as natural estrogen. 
Potensi Daun Kayu Bawang (Protium javanicum) sebagai Penghambat Kerja Enzim Tirosinase Irmanida Batubara; Morina Adfa
Sains dan Matematika Vol. 1 No. 2 (2013): April, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

Utilization of Kayu Bawang (Protium javanicum) plant is needed beside its utilization for building material, especially the utilization of the leaves which easily to get. The aim of this research was to describe the potency of Kayu Bawang leaves as tyrosinase inhibitor, an enzyme which responsible to synthesis melanin as natural color of the skin. The leaves of Kayu Bawang macerated with methanol. The methanol extract then partitioned with n-hexane, EtOAc, n-BuOH, and water. All fractions were concentrated and tested its ability to inhibit tyrosinase with two substrates namely L-DOPA (diphenolase reaction) and L-tyrosine (monophenolase reaction). The result showed that n-hexane fraction could inhibit diphenolase reaction with IC50 value of 114.2 ppm. EtOAc fraction could inhibit monophenolase reaction (IC50 834.0 ppm). Methanol extract, n-BuOH fraction, and water fraction could not inhibit tyrosinase activities. The conclusion is nonpolar and semi polar compounds in Kayu Bawang leaves could be utilized as whitening agent. 
Perbedaan Karakter Tiga Jenis Bentonit Ditinjau dari Tiga Macam Cara Analisis Toeti Koestiari
Sains dan Matematika Vol. 1 No. 2 (2013): April, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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The objective of this research was to determine differences in the physico-chemical character of the bentonite-Sigma (BS) compared with Al pillared bentonite (B-Al/400° C), and technical bentonite (BT) so we can know the nature of the surface. This experimental research laboratory using three instruments, namely Buck Scientific IR Spectrophotometer - 500, Gas Sorption Analyzer Quantachrome NovaWin2, and Scanning Electron Microscope (SEM-EDX).The result of this research showed the differences in physico-chemical character of BS, B-Al/400° C and BT in terms of: (1) The position of the main functional groups using IR Spectrophotometer instrument; (2) The surface areas of B-S, B-Al/400° C, and B-T are 24.78 m2/g; 217.021 m2/g; and 51.935 m2/g, while total pore volume for the pore radii smaller than 1001.9 Ǻ (B-S) and smaller than 1273.1 Ǻ (B-Al/400 oC) and less than 1013.9 AÌŠ (B-T) using Gas Sorption Analyzer. (3) Using SEM-EDX indicated that the percent mass compounds of B-S are Al2O3: 19.78%, and SiO2: 80.22%; the percent mass compounds of B-Al/400° C are Al2O3: 30.43%, and SiO2: 69.57%. the percent mass compounds of B-Tare Na2O: 2.64%; Al2O3: 20.75%, SiO2: 57.55%, FeO: 13.73%. 
Perambatan Gravity Current dalam Skala Laboratorium sebagai Pemodelan Lahar Dingin dan Intrusi Air Laut Wawan Eko Budianto; Imam Sucahyo; Tjipto Prastowo; Endah Rahmawati
Sains dan Matematika Vol. 1 No. 2 (2013): April, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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In the context of problem-based learning, gravity current experiment to model saltwater intrusion and œlahar dingin using a water tank available at the Laboratory of Earth Science in the Department of Physics, the State University of Surabaya is research breakthrough in physics education. This makes physics teaching meaningful as it is part of the introduction of disaster mitigation education to students in the department. The experiments were performed in two stages to determine the speed and depth of gravity current. In the first stage, a number of runs were conducted by varying density difference between saltwater and freshwater (1%, 3%, or 5%). The two fluids were filled in the tank at the total water depth of 10 cm or 20 cm. In the second stage, other runs were conducted using a water tank of the same length but twice narrower. The results show that the dimensionless speed is measured to be 0.44 ± 0.03, independent of the width of the tank. Relatively compared to the speed, the current depth is difficult to measure owing to the presence of mixing. However, experimental photos show that the current depth is best estimated to be 0.32-0.46 H, where H is the total depth 

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