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INDONESIA
SAINS DAN MATEMATIKA
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue "Volume 23 Issue 3 Year 2015" : 5 Documents clear
Effect of Series Circuit on the Lactose Bioelectricity of a Microbial Fuel Cell System using Lactobacillus bulgaricus Hayati, Dini Noor; Nuryanto, Rahmad; Suyati, Linda
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 3 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

The need for alternative energy, especially electricity at this time is increasing. The decreasing amount of fuel that cannot be updated, encouraging scientists to conduct researches in finding alternative energy sources which are environmentally friendly, one of the alternative energy is the Microbial Fuel Cell (MFC). The research on the effects of a series circuit on the production of lactose bioelectricity microbial fuel cell system using Lactobacillus bulgaricus has been conducted. This study aim was to assess the effect on the production series circuit lactose bioelectricity MFC system using microbes Lactobacillus bulgaricus. Stages of research included a microorganism preparation of Lactobacillus bulgaricus, and measuring the potential difference in a single, series 1 and series 2 circuits in the MFC system. The potential difference on the measurement of a single, series 1 and series 2 on the substrate lactose were 45 mV / 100mL; 57 mV / 100mL; 58 mV / 100mL respectively where the power were 105.75x10-6 mW; 136x10-6 mW; 139.2x10-6 mW. These results suggested that series circuit was able to increase the potential difference and power on the substrate lactose and tofu whey the MFC system according to Ohm’s law. Keywords: Lactose, microbial fuel cell, Lactobacillus bulgaricus, a series circuit
Role of Saturated Fatty Acid (SFA) for Degradation of Oil Quality Firdausi, Ketut Sofjan
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 3 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

In this study, the phenomena of natural polarization has been used as a preliminary test of vegetable oil quality. The formation of saturated fatty Acid (SFA) has been studied as a most responsible parameter for degradation of oil quality related to its expired limitation. The Oil quality was indicated by change of light polarization, and was measured using pair of polarizer-analyser. The result shows that the change of polarization can be used to indicate oil quality level related to its expiration date. This method also shows predicted SFA formation and apparently it is relative more powerful than standard parameters such as free fatty acid (FFA) test and peroxide value (PV) test. For future, this method has provided good prospect to evaluate the existence of the halal level of oil due to lard (pig oil). Keywords: natural polarization, vegetable oil quality, saturated fatty acid (SFA)
Correction of 2D Isodose Curve on the Sloping Surface using Tissue Air Ratio (TAR) Method Nuzula, Nurul Firdausi; Adi, Kusworo; Anam, Choirul
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 3 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

The curve of 2D isodose is used to determine the dose distribution in patient treated by radiotherapy. Therefore, isodose curve is very useful for planning and evaluating of the dose received by the patient. Correction of 2D isodose curve for sloping surface is very important due to the skin of patient is not flat. In this study, the correction of isodose curve was calculated using tissue air ratio (TAR) method for radiation field size of 10x10 cm2. The correction factor was obtained by comparison of TAR value for effective depth and TAR value for total depth. The correction factor then was multiplied to isodose curve for flat surface. In this study, the software for calculating the automated correction factor due to sloping of patient surface has been successfully developed. It was found that if the sloping of patient surface increases then the corrected isodose curve increases. Key wods: 2D isodose curve, tissue air ratio (TAR), correction factor, sloping patient surface.
The Potential Test of Fungal Antagonist Trichoderma viride to inhibit the Growth of Pathogenic Fungi Fusarium moniliforme and Alternaria solani In-Vitro Purwantisari, Susiana; Evendi, Agus
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 3 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Fusarium moniliforme and Alternaria solani are two types of mold which often cause the diseases of cultivated plants. Fusarium moniliforme causes the ear rot disease on corn and the wilt disease of Solanaceae family. Whereas the pathogenic fungus Alternaria solani causes an early bright disease on the onion and potato. This aim of this study was to determine the ability of fungal antagonist Trichoderma viride in inhibiting the growth of Fusarium moniliforme and Alternaria solani in vitro. The growth inhibition ability test were conducted on dual cultures by growing the fungal antagonists with pathogenic fungi in Petri dish containing potato dextrose agar media face-to-face in a distance of 3 cm. Percentages of the growth inhibiting were observed every day in 7 days incubation. The results showed that the fungal antagonist T. viride exhibited the highest inhibition on F. moniliforme in 3 days incubation period which was 63.07 %. Yet the highest inhibition against A. solani was in 2 days incubation period which was 57.35 %. T. viride growth continued to increase since the first day until the seventh day incubation period but contrarily the growth of both pathogenic fungi underwent inhibition. This suggested that T. viride was potential as a biological control agent of F. moniliforme and A. solani growth and have a potency as an active bio fungicide ingredient. Keywords: Dual culture; percentage inhibiting; Trichoderma viride; Alternaria solani; Fusarium moniliforme
Design of Non-Invasive Glucometer using Microcontroller ATMega-8535 Hidayanto, Eko; Sutanto, Heri; Arifin, Zaenal
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 3 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Symptoms of Diabetes Mellitus (DM) or diabetes could be indicated by measuring blood sugar levels in the body. One of the health technology to detect blood sugar in non-invasive is to utilize the absorption of laser light and oxymeter sensor capable of generating a voltage change on a variety of fluid medium. This study has been designed using the blood sugar measuring device microcontroller ATMega 8535 as a minimum system in controlling the value of output in the form of data digital. System/equipment to be fabricated in this study is a non-invasive method (without injuring the patient's body when taking a blood sample) to determine the blood sugar content by exploiting the physical properties of absorption of laser sensors on a variety of blood sugar content. To improve the quality of the test data used 8-bit microcontroller that is capable of separating the output data 256 bits (binary). Each of these bit values can be used to replace manual sensor test results that have analogue voltage output of the data. This analogue data will then be converted to analogue to digital converter (ADC) into digital values are displayed in the liquid crystal display (LCD) that is directly readable by the measured/patients in a short period of time less than 5 minutes. The results of the research can be developed into a national program providing portable medical test equipment is cheap and movable. Keywords: DM, Blood Sugar, Sensor of Oxymeter, Red Laser, Microcontroller ATMega 8535

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