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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 2, No 2 (2018)" : 5 Documents clear

THE INFLUENCE OF LIQUID VISCOSITY ON FALLING TIME BY FALLING BALL METHOD Nur Azizah Lubis
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 2, No 2 (2018)
Publisher : Universitas Islam Negeri Sumatera Utara Medan

A study has been conducted to determine the influence of liquid viscosity on falling time using the falling ball method. The results showed that there was an effect of liquid viscosity on the fall time which can be seen from the oil viscosity value ( ) = 15.94 dyn s/cm2 which is greater than glycerin ( ) = 15.51 dyn s/cm2 and the coefficient of determination (R2) of oil and glycerin are 0.9958 and 0.9799, respectively. Temperature changes in oil are lower than glycerin. In oil, the initial temperature is 30.1 °C and the final temperature is 30.5 °C, while in glycerin, the initial temperature is 31.1 °C and the final temperature is 31.8 °C. This shows that the higher the viscosity of a liquid, the greater the time needed for the ball to fall. The more balls dropped, the more friction occurs so that the liquid temperature gets higher and the ball's falling speed gets faster and the liquid viscosity value gets lower. Keywords: Falling ball method, falling time, and liquid viscosity.

PREPARATION AND CHARACTERIZATION OF POLYMER CONCRETE USING PUMICE AGGREGATE AND COFFEE HUSK FIBER AS A FILLER Awan Maghfirah; Eddy Marlianto; Mulkan Iskandar Nasution; Putri Mila Senda Sitorus
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 2, No 2 (2018)
Publisher : Universitas Islam Negeri Sumatera Utara Medan

Research has been conducted on the preparation and characterization of polymer concrete with certain compositions of sand, pumice, coffee husk fiber, and epoxy resin to get the best mixing composition. All compositions were processed using a hot press machine at a temperature of 90 °C for 20 minutes. The results showed that polymer concrete with optimum characteristics is produced in the mixing composition of sand, pumice, coffee husk fiber, and epoxy resin of 60:14:6:20 g. In this condition, the density is 1.21 g/cm3, porosity is 8.3%, water absorption is 6.81%, flexural strength is 28.68 MPa, compressive strength is 7.67 MPa, and tensile strength is 3.98 MPa. SEM/EDS analysis shows that the addition of epoxy resin can improve the quality of polymer concrete. Keywords: Coffee husk fiber, epoxy resin, polymer concrete, and pumice.

THE INFLUENCE OF MASS ON VELOCITY AND ACCELERATION BASED ON NEWTON’S SECOND LAW BY USING LINIER AIR TRACK Ratni Sirait
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 2, No 2 (2018)
Publisher : Universitas Islam Negeri Sumatera Utara Medan

The research aims to see whether there is influence of distance on time, mass effect on velocity, and mass effect on acceleration. Variables in this study consisted of manipulation variables of load and distance mass, response variables i.e. time taken and moving load velocity. The results showed that the effect of distance to time can be seen from the correlation coefficient value R2 = 0.999 for the mass of 128 g and 400.46 g which means that there is influence of 99.9%. And there is the effect of mass on the velocity and acceleration that is the velocity and acceleration of the load mass of 128 g of 0.062 m/s and 0.00625 m/s2 greater than the velocity and acceleration with mass load 400.46 g of 0.056 m/s and 0.0518 m/s2. It is proven by Newton's law of velocity and acceleration is inversely proportional to mass, meaning that the greater the load mass, the speed and acceleration of the object will be smaller, and vice versa. Keywords: Acceleration, linier air track, load mass, Newton’s second law, and velocity.

SYNTHESIS OF RUTILE TIO2 NANOPARTICLES BY CO-PRECIPITATION METHOD Nazaruddin Nasution; Aida Fitri
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 2, No 2 (2018)
Publisher : Universitas Islam Negeri Sumatera Utara Medan

Abstract. The objective of this research is to produce rutile TiO2 nanoparticles by co-precipitation method and to determine its characterization using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS), X-ray Diffractometry (XRD), and Particle Size Analysis (PSA) methods. Synthesis of rutile TiO2 nanoparticles by co-precipitation method in this study was initiated by mixing 15% TiCl3 solution into distilled water while stirring at constant speed for some time. Then, pH is adjusted to 11-13 by dripping ammonia (NH4OH) solution while continuing to stir. The precipitate (white gel) is then dried in the oven and crushed to produce TiO2 powder. The morphology of the TiO2 particles obtained is spherical and tends to agglomerate. The average particle size of TiO2 produced is 192.2 nm. The EDS results show that the percentage of Ti mass in TiO2 particles is 59.52%. Based on XRD analysis, there are two phases formed namely anatase and rutile with a tetragonal crystal system.Keywords: Co-precipitation method, nanoparticles, and rutile.

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)
Publisher : Universitas Islam Negeri Sumatera Utara Medan

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

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