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Fisitek : Jurnal Ilmu Fisika dan Teknologi

Fisitek
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Published by Universitas Islam Negeri Sumatera Utara

ISSN : 25806661 EISSN : 2580989X DOI : -

Core Subject : Science, Education,

Computer Science & IT Education Physics

FISITEK: Jurnal Ilmu Fisika dan Teknologi is a peer-reviewed journal which covers all aspects of theoretical and practical research of physics and their use. FISITEK is published by Physics Department of Science and Technology Faculty, State Islamic University of Sumatera Utara Medan (Universitas Islam Negeri Sumatera Utara Medan), Indonesia. FISITEK appears twice a year, in February and August. FISITEK is available in electronic and print editions.

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Articles 5 Documents

Search results for , issue "Vol 1, No 2 (2017):" : 5 Documents clear

EFFECTS OF KAOLIN CONCENTRATION AS FILLER ON VULCANIZATION OF RUBBER YARNS Shinta Marito Siregar
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 1, No 2 (2017):
Publisher : Universitas Islam Negeri Sumatera Utara Medan

Abstract. A study has been conducted by mixing kaolin and titanium dioxide (TiO2) used as a filler on latex compounds which have been concentrated in the manufacture of rubber yarns with kaolin variations of 0; 6; 12; 15. This research was conducted to find out the result of kaolin concentration effects on rubber yarns vulcanization. The results showed that the concentration of kaolin mixed with titanium dioxide (TiO2) affect on rubber yarns vulcanization. The higher the concentration kaolin the smaller the swelling, so the time of vulcanization will take longer.Keywords: Kaolin, Rubber Yarns, and Vulcanization

QUALITY IMPROVEMENT OF WATER USING ELECTROCOAGULATION AND CARBON FILTER METHODS Masthura Masthura; Ety Jumiati
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 1, No 2 (2017):
Publisher : Universitas Islam Negeri Sumatera Utara Medan

Study on the effect of comparison and improvement of water quality using electrocoagulation and carbon filter methods has been conducted. This study aims to find out a safe method to be an alternative in producing clean water up to drinking water that can be used to meet daily needs in accordance with clean water and drinking water standards. The parameters tested include physical parameters (temperature, TDS, turbidity, color, odor, and taste), chemical parameters (pH, iron (Fe), and aluminum (Al)), and microbiological parameters (E. coli and Coliform Bacteria). The test results show that water purification using activated carbon is much better than water test result by electrocoagulation method. This is reflected in physical and chemical parameters that have met the clean water standard (Permenkes RI No. 416/1990) and drinking water standard (No. 492/MENKES/PER/IV/2010). As for microbiological parameters are still not meet the clean and drinking water standards.Keywords: Activated carbon, electrocoagulation, and filters.

THE INFLUENCE OF EL NIÑO ON RAINFALL VARIABILITY IN NORTH SUMATRA PROVINCE Hendri Irwandi; Mulkan Iskandar; Edison Kurniawan; Yeni Megalina
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 1, No 2 (2017):
Publisher : Universitas Islam Negeri Sumatera Utara Medan

El Niño is a global phenomenon that affects the variability of rainfall in the Province of North Sumatra, Indonesia. The impact of El Niño will be different for each region. This review will analyse the influence of El Niño activity on seasonal and annual rainfall variability. In this research, North Sumatra Province will be divided into 4 (four) regions based on its topographical conditions, such as: East Coast (EC), East Slope (ES), Mountains (MT), and West Coast (WC). The method used was statistical and descriptive analysis. Data used in this research were rainfall data from 15 stations/climate observation posts which is spread in North Sumatera region and anomaly data of Nino 3.4 region over the period 1981 – 2016. The results showed that the active El Niño had an effect on the decreasing of rainfall in the period of DJF, JJA, and SON in East Coast, East Slope, and Mountains with an average annual percentage decline up to 7%.Keywords: El Niño, rainfall, variability, and North Sumatra.

ANALYSIS OF EFFECT OF YEAST MASS ADDITION AND FERMENTATION TIME TO THE VOLTAGE OF DURIAN (DURIO ZIBETHINUS) HUSK WASTE PASTE Khairiah Khairiah; Rita Destini
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 1, No 2 (2017):
Publisher : Universitas Islam Negeri Sumatera Utara Medan

Study on the fermentation process of durian (Durio zibethinus) husk waste has been conducted. The fermentation process is done by varying the yeast mass used in the synthesis process and the preparation of the paste. There were also several tests on the duration of the fermentation process to observe the difference of the resulting voltage. In addition, observations were made to measure changes in pH. The pH or degree of acidity is used to express the degree of acidity or base possessed by a substance, solution, or an object. The principle of this study involves only the transport of electrons between two electrodes separated by a conductive medium (electrolyte) that provides electrostatic motion in the form of electrical and current potentials. In the electrolyte electrode, the electrons flowing are carried by the ions and then electrolyzed. The results show that the longer storage time tends to increase the electrical conductivity. This can happen because the acidity of the solution is increasing. In a solution, if the concentration of H+ ions increases, the OH– ion decreases, meaning that the H+ ion moves easily in the solution, so the solution becomes acidic and the electrical conductivity increases. The results showed that the conductivity tends to increase with the length of storage. This happens because the acidity of the solution is increasing. The electrical conductivity shows the ability of the liquid to conduct electricity that is related to the movement of ions in the solution, ions that can move easily have large electrical conductivity.Keywords : Degree of acidity, fermentation, fermentation time, voltage, and yeast mass.

FUZZY LOGIC CONTROL OF AIR-CONDITIONING SYSTEM IN LECTURER ROOM OF STMIK INDONESIA PADANG Gusrino Yanto
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 1, No 2 (2017):
Publisher : Universitas Islam Negeri Sumatera Utara Medan

Abstract. The research on Fuzzy logic control of air-conditioning system in lecturer room of STMIK Indonesia Padang has been done. AC is a system or machine designed to stabilize the air temperature and humidity of an area used for cooling or heating depending on the nature of air at certain time. Commonly the AC uses a refrigeration cycle but sometimes uses evaporation. Lecturer room of STMIK Indonesia Padang has a size of 120 m2 and consists of 32 rooms. For the convenience of lecturers activity, the room is equipped by three AC each of 3 PK. The room has problems in determining the right size in the AC setting, sometimes the air temperature in the room is too cold or too hot. There are many activities conducted in the lecturer room, in the form of providing excellent service to students, such as thesis supervision, practical work, and discussion activities. With the number of lecturers in the room that is as many as 32 people and each serves about five to ten students daily then the room temperature sometimes becomes unstable. Based on the results of the study, with the room size of 120 m2 and the number of person as many as 100 people using three AC (each with 3 PK capacity) so the appropriate temperature is at position 18.0 ºC.Keywords: Air Conditioner, Fuzzy Logic, and Temperature

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