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INDONESIA
FISITEK
ISSN : 25806661     EISSN : 2580989X     DOI : -
Core Subject : Science, Education,
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 15 Documents
THE PROVISION OF NUTRIENTS AND AUTOMATIC WATERING PLANT BASED ON REAL TIME CLOCK AND SOIL HUMIDITY BASED MICROCONTROLLER ATMEGA32 Abdullah, Abdullah; Masthura, Masthura
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 2, No 2 (2018): Agustus 2018 - Januari 2019
Publisher : Program Studi Fisika Universitas Islam Negeri Sumatera Utara Medan

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Abstract

The provision of nutrients and watering plants system is very useful for agriculture as farming support. This system does not only process the watering of plants but already equipped with the provision of nutrients that are needed for the development of plants, so the problem of dry soil conditions and the provision of nutrients that are late (not in time) often causes crop failure is no longer a problem in farming. This research uses a type of soil moisture sensor that has two plates as a sensitivity to readings of electric charge, the DS1307 type of Real Time Clock module which is used as a timer to be read in real time, Atmega32 type of microcontroller that functions as a center for processing all data (input / output), and equipped with a 4 x 20 LCD so that the description of the system both the results of measurements, the time of setting the nutrition and other information can be seen clearly on the LCD screen. From the results of testing obtained to prove that this system has been successfully integrated and able to work properly according to the desired target, which can provide nutrients to plants according to the time set and can do the process of watering plants automatically according to the condition of the soil.Keywords: automatic, soil moisture sensor, nutrition, watering, real time clock
EFFECTS OF KAOLIN CONCENTRATION AS FILLER ON VULCANIZATION OF RUBBER YARNS Siregar, Shinta Marito
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 1, No 2 (2017):
Publisher : Program Studi Fisika Universitas Islam Negeri Sumatera Utara Medan

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Abstract

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
PHASE COMPOSITION AND CRYSTAL STRUCTURE OF DURIAN (DURIO ZIBETHINUS) HUSK WASTE POWDER USING RIETVELD METHOD Khairiah, Khairiah; Nasution, Lia Afriyanti
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 2, No 1 (2018): Februari 2018 - Juli 2018
Publisher : Program Studi Fisika Universitas Islam Negeri Sumatera Utara Medan

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Abstract

Based on previous research on electrical analysis of electrolyt pastes from durian husk waste as biobatteries that generate an electric voltage about 1.5 volts. Researchers want to develop durian husk waste material to commercial that was increasing the electrical voltage with nanotechnology. It was  known that when the particle size went to the nanometer scale, this phenomenon affects some material properties, one of which was the increase in electrical conductivity. The nanomaterial derived from durian husk waste as a biobattery was synthesized by coprecipitation method which was one of development methods of nanotechnology. Based on the analysis of SEMand XRD characterization data of durian husk waste powder, it was concluded that the results of the synthesis process using the coprecipitation method obtained powder which has crystal size about 5 nm. Phase composition contained in durian skin waste nano powder is dominated by phosphate (PO4) elements, namely aluminum phosphate, aluminum silicate hydrate, and titanium nitrate, but evenness of particles still tends to occur agglomeration or clumping caused by oxygen. It can be concluded also that the higher and longer heating treatment the morphology of the durian husk waste particles more evenly and minimize the occurrence of agglomeration.Keywords:  copresipitation method, electrical properties, nanopowder of durian  husk waste, and phase composition
QUALITY IMPROVEMENT OF WATER USING ELECTROCOAGULATION AND CARBON FILTER METHODS Masthura, Masthura; Jumiati, Ety
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 1, No 2 (2017):
Publisher : Program Studi Fisika Universitas Islam Negeri Sumatera Utara Medan

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Abstract

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.
DETECTION AND MONITORING SYSTEM OF SMOKE CONCENTRATION WITH SMOKE DETECTOR AND CAMERA TRACKER Abdullah, Abdullah
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 2, No 1 (2018): Februari 2018 - Juli 2018
Publisher : Program Studi Fisika Universitas Islam Negeri Sumatera Utara Medan

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Abstract

Detection and monitoring system of smoke concentration is very useful forplaces that tend to be flammable or area/room that are designated as non smoking area. This system is not only able to detect smoke but also determine the existence of point/source of smoke (areas where greater smoke concentrations are detected). The presence of smoke sources can be observed by monitoring systems with the addition of mobile camera trackers to focus on the presence of smoke sources. This system is veryhelpful to facilitate the building/room security officers in monitoring the smoke in their area, either smoke caused by fire or cigarette smoke in non smoking area. This researchuses MQ-2 type smoke sensor, ATmega32 as controller, and also equipped with LCD display, monitor screen, and camera tracker. The test results prove that the system has been successfully integrated and able to achieve the desired target, that this system can be used properly to detect and monitor the presence of smoke sources.Keywords: camera tracker, detection and monitoring system, and smoke sensor.
THE INFLUENCE OF EL NIÑO ON RAINFALL VARIABILITY IN NORTH SUMATRA PROVINCE Irwandi, Hendri; Iskandar, Mulkan; Kurniawan, Edison; Megalina, Yeni
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 1, No 2 (2017):
Publisher : Program Studi Fisika Universitas Islam Negeri Sumatera Utara Medan

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Abstract

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.
PREPARATION AND CHARACTERIZATION OF POLYMER COMPOSITE TILE BASED ON BOILER ASH WASTE FROM PALM OIL INDUSTRY AND FIBER FROM WASTE TIRE REINFORCED BY ASPHALT Maghfirah, Awan; Dharma Sembiring, Anwar; Iskandar Nst, Mulkan
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 2, No 1 (2018): Februari 2018 - Juli 2018
Publisher : Program Studi Fisika Universitas Islam Negeri Sumatera Utara Medan

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Abstract

Polymer composite tile based on boiler ash waste from palm oil industry (ABKS) and fiber from waste tire reinforced by asphalt have been prepared through compression molding techniques. The raw materials consist of sand, ABKS, recycled tire fibers, asphalt, and epoxy resin with variation of ABKS and recycled tire fibers composition by 20%:0%, 18%:2%, 16%:4%, 14%:6%, 12%:8%, and 10%:10%. The characterization performed includes: physical properties (density and water absorption), mechanical properties (compressive strength, impact strength, and flexural strength), and thermal properties (DTA, Differential Thermal Analysis). The test results showed that sample with the optimum composition of sand, ABKS, recycled tire fibers, asphalt, and epoxy resin of 55%: 12%: 8%: 10%: 15% had the highest density value of 1.64 grams/cm3, water absorption of 1.72%, impact test value of 77.68 kJ/m2, bending strength value of 19.373 MPa, and DTA temperature of 360 ºC. These results meet SNI standards for existing tiles and can be used as an alternative tile materials which is affordable and environmentally friendlyKeywords: Boiler ash waste from palm oil industry (ABKS), polymer composite tile, and recycled tire fibers
ANALYSIS OF EFFECT OF YEAST MASS ADDITION AND FERMENTATION TIME TO THE VOLTAGE OF DURIAN (DURIO ZIBETHINUS) HUSK WASTE PASTE Khairiah, Khairiah; Destini, Rita
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 1, No 2 (2017):
Publisher : Program Studi Fisika Universitas Islam Negeri Sumatera Utara Medan

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Abstract

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.
MANUFACTURE OF LIGHTWEIGHT CONCRETE BASED ON ORGANIC WASTE Jumiati, Ety; Masthura, Masthura
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 2, No 1 (2018): Februari 2018 - Juli 2018
Publisher : Program Studi Fisika Universitas Islam Negeri Sumatera Utara Medan

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Abstract

The making of lightweight concrete for lightweight construction materials has been conducted with raw materials based on organic waste from households. The purpose of this study was to utilize household organic waste as aggregate for the manufacture of lightweight concrete. The materials used consist of organic waste, sand, cement, and latex resin with the variation of organic waste composition are 0, 25, 50, 75, and 100% by volume and the addition of latex resin are 10, 12, and 14% by volume. Test parameters performed include density, water absorption, shrinkage, compressive strength, tensile strength, and flexural strength. The result showed that the optimal composition of produced concrete are 25% by volume of waste and 12% by volume of latex resin with the density = 1.46 g/cm3, water absorption = 26.70%, shrinkage = 0.143%, compressive strength = 7.10 MPa, tensile strength = 2.10 MPa, and flexural strength = 2.67 MPa.Keywords: Latex, lightweight concrete, and organic waste.
FUZZY LOGIC CONTROL OF AIR-CONDITIONING SYSTEM IN LECTURER ROOM OF STMIK INDONESIA PADANG Yanto, Gusrino
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 1, No 2 (2017):
Publisher : Program Studi Fisika Universitas Islam Negeri Sumatera Utara Medan

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Abstract

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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