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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.

Arjuna Subject : -

Articles 83 Documents

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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

ANALYSIS STUDY THROUGH MATHEMATICA 5.1 SIMULATION PROGRAM IN DETERMINING THE DENSITY AND POROSITY OF CORDIERITE CERAMICS Juliandi Siregar; M Gade; Khairiah Khairiah; Shinta Marito Siregar
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 3, No 1 (2019)
Publisher : Universitas Islam Negeri Sumatera Utara Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30821/fisitek.v3i1.5510

The research conducted was an experiment with a computational simulation design using the Wolfram Mathematica 5.1 program to view and analyze physical characteristics (density and porosity) of Cordierite Ceramics. The involvement of advanced computers in research will connect the theories and experiments that have been accepted as one of the methods of material research and development. The research variables in this simulation are sintering temperatures of 1200, 1250, 1300, and 1350 °C mixed with wood powder by 20% by weight. The parameters of this study are density and porosity. The simulation results show that with a composition of 20% wood powder and sintering temperature of 1300 °C the density values of 0.97 g/cm3 and porosity of 60.11% are the best conditions that are close to the literature. By comparing the results of simulations and experiments, it can be concluded that through simulation analysis of density and porosity, constant changes can be obtained due to a constant increase in sintering temperature and it can also be analyzed with a smaller temperature increase interval.Keywords: Cordierite Ceramics, Density, Porosity, and Wolfram Mathematica.

MONITORING AND DETECTION SYSTEM OF NUTRITION FLUID CONCENTRATION AND TEMPERATURE CONDITION AT HYDROPONIC PLANTING PROCESS Abdullah Abdullah
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 3, No 1 (2019)
Publisher : Universitas Islam Negeri Sumatera Utara Medan

Monitoring and detection system of nutrition fluid concentration and temperature condition is very needed to process hydroponic planting, nutrition fluid concentration and temperature is important variable to determine result plant of hydroponic. The value of nutrition fluid concentration and temperature which is not appropriate can be sure of crop failure. The system can detect and monitor nutrition fluid concentration and temperature at the plant. So that if two variables is not in the right condition, there will be a notification in the form of an alarm and warning to be displayed to LCD, so that the problem of the condition of faulty nutrition and the need for improper temperatures can be overcome. The research used Temperature sensor DHT11 who can sense temperature object where the output is an analog output that must be converted into digital data so that it can be processed by the microcontroller, TDR sensor (Total Dissolve Solid) which can know nutrition fluid concentration while the TDS value high so the fluid is turbid, vice versa. The function of microcontroller Atmega328 as a centre processing for all data (input/output) and equipped with 4 x 20 cm2 LCD display output. So the information of the result measurements and other information can be seen clearly on the LCD display. The result of the analysis proved that sistem had inregrated successfully and reach target who expectation is the sistem can used to monitor and detect sistem of nutrition fluid concentration and temperature condition at hydroponic planting process.Keywords: concentration, fluid, hydroponic, nutrition, and temperature.

THE USE OF PALM OIL TRUNK POWDER AS FILLERS IN THE MAKING OF GYPSUM CEILING SHEETS WITH POLYURETHANE BINDER Rahmadhani Banurea; Mulkan Iskandar Nasution
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 3, No 1 (2019)
Publisher : Universitas Islam Negeri Sumatera Utara Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30821/fisitek.v3i1.5512

A study has been conducted on the effect of palm oil trunk powder as fillers in the making of gypsum ceiling sheets for physical, mechanical, and DTA properties. The type of adhesive used is a polyurethane binder. Palm oil trunk powder is varied in 5, 10, 15, 20, and 25 g. The results showed that the physical properties (density of 1.6 g/cm3 and water absorbency of 15.08%) in the composition of 5 grams of palm oil trunk powder were the best results. The higher the powder level the higher the density value but the lower the water absorbency. The results of the physical properties test still meet the standards of SNI 03-2105 1996 and are still above the physical properties of the Jaya Board gypsum ceiling. The results of mechanical test (impact test 2.0 x 10-4 J/mm2, tensile test 305.8 kPa, flexural strength test/MOE 7233.8 kg/cm2, and fracture strength test/MOR 13.44 MPa) were the best results and at composition of 25:25:15. This composition is the most homogeneous composition so that its mechanical properties are optimum. Keywords: ceiling sheets, palm oil trunk powder, and polyurethane.

ANALYSIS OF GRAPHITE CARBON BLACK SLURRY DERIVED FROM DURIAN (DURIO ZIBETHINUS) SKIN AS A CANDIDATE FOR BIO-BATTERY ANODE MATERIAL Khairiah Khairiah; Jafri Haryadi
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 3, No 1 (2019)
Publisher : Universitas Islam Negeri Sumatera Utara Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30821/fisitek.v3i1.5465

In this study, activated carbon from durian skin will be used as a candidate for bio-battery anode material. The precipitation method is used with citric acid and ethanol as the precipitation medium. Durian skin is carbonated and sintered with furnace at temperature of 250 – 1250 °C until it turns into graphite carbon black slurry. Samples are characterized by measuring its absorbency, surface area, pore size, and electrical conductivity. The absorbency increases with increasing value of variables (absorption time, sintered temperature, pore size, surface area, and electrical conductivity). The highest absorbency is 780 mg/g is achieved at 1250 °C, pore radius of 200 nm, surface area of 540 m2/g, and electrical conductivity of 437 S/m.Keywords: absorbency, bio-battery, durian skin, graphite carbon black slurry, and pore size.

CLASSIFICATION OF MOUNT KELUD VOLCANO SEISMIC SIGNALS DURING ERUPTION IN NOVEMBER 2007 Lailatul husna lubis; Ratni Sirait; Miftahul Husnah; Ridwan Yususf Lubis
FISITEK: Jurnal Ilmu Fisika dan Teknologi Vol 3, No 1 (2019)
Publisher : Universitas Islam Negeri Sumatera Utara Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30821/fisitek.v3i1.5473

Classification of mount Kelud volcano seismic signals can be divided into several types, VT-A, VT-B, low frequency, multiphase, and tremor. The analysis by classifying the volcano seismic signal from eruption of Mount Kelud based on the shape of the signal. Data analyzed were starting on 16 to 27 October 2007. The results of volcano seismic signal which recording showed different shapes and were classified according to the type of signal. Each seismic signal recording is grouped according to its shape and the classification results are signaled into VT-A, VT-B, multiphase, low frequency, and tremor.Keywords: Kelud mountain, low frequency, multiphase, signal classification, tremor, VT-A, and VT-B.

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