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Pillar of Physics: Jurnal Berkala Ilmiah Fisika

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Published by Universitas Negeri Padang

ISSN : 23379030 EISSN : 26852608 DOI : http://dx.doi.org/10.24036/10741171074

Core Subject : Science,

Earth & Planetary Sciences Materials Science & Nanotechnology Physics

This journal publishes original articles on the latest issues and trends occurring internationally in: 1 Geophysics, 2 Electronics and Instrumentation, 3 Material Physics, (4) Computational Physics. Other topics are related to physics are most welcome.

Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)

Articles 297 Documents

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Pengaruh variasi komposisi pada sifat magnet dari nanokomposit NiFe2O4/PANi yang disintesis dengan metode sol-gel spin coating (Composition variations effect on the magnetic properties of NiFe2O4 / PANi nanocomposites synthesized by the sol-gel spin coating) - Helmita; - Ramli; - Hidayati
PILLAR OF PHYSICS Vol 12, No 1 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

NiFe2O4-polyaniline nanocomposites (NiFe2O4-PANi) with different contens of NiFe2O4 and PANi (30%,40%,50%,60% and 70% were prepared via sol-gel spincoating methode. The prepared sample were characterized using some teqniques such as X-Ray difraction and magnetic properties of the nanocomposites were measured using vibrating sample magnetometer. Nanocomposites were prepared using sol-gel spin coating technique (Fe(NO3)3.9H2O and Ni(NO3)2.6H2O precursors. Composite gels were coated on a glass substrate followed by drying and annealing to be used as thin films. Thin layers of nanocomposites were characterized using X-Ray Diffraction and Vibrating Sample Magnetometer, crystal size, coercivity, remanent magnetization, saturation magnetization at 30% composition were 44.36nm, 512Oe, 1.02mm, 1.02mm, at 40% variation respectively was 21.20 nm; 579,91Oe; 1,07 mm; 3,15mm; on 50% variation were 42,25nm; 562,42Oe; 1,04mm; 3,50mm; on 60% variation 43,96nm respectively; 639 .0Oe; 1.04mm; 3.01mm, at 60% variation respectively 39.18nm; 447.21Oe; 1.33mm; 4.38. Variations of NiFe2O4 / PaNi nanocomposite composition affect crystal size and magnetic properties of nanocomposite samples NiFe2O4 / PaNi

Identifikasi komposisi unsur logam berat pada lindi tempat pemrosesan akhir (TPA) sampah Kota Padang menggunakan X – Ray Fluorescence (XRF) (Identification of the composition of heavy metal elements in the leachate of Padang City waste final processing site using X-Ray Fluorescence (XRF) Iswandi Iswandi; - Mahrizal; Fatni Mufit
PILLAR OF PHYSICS Vol 5 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Final waste processing site of Padang City is located on Air dingin, Kelurahan Balai Gadang, Koto Tangah Sub – distrik has 8 leachate holding pond. At 8 leachate holding pond flowe in to river next to final processing site. Most of residents around the final processing site use water fromriver and well around waste processing site as a source of clean water for daily life. This research aims to know composition ofheavy metal in sedimen of leachate pond, river sediment and gutter sediment of final waste processing site Air Dingin, Padang City. The sample used in this research are 4 samples of leachate pond sediment, 1 sample of gutter, 1 sample of riversediment which have been measured magnetic susceptibility values. The measurement result XRF will show content of elements contained in the samples. Determining the content of heavy metal using determined by matched measurement result with periodic table. The measurement result using XRF further made in to table and graph. The measurement result using XRF show that heavy metal contained insample of leachate pond sediment are Titanium (Ti), Vanadium ( V), Cromium ( Cr ), Manganese ( Mn ), Iron ( Fe ), Cobalt ( Co ), Zinc ( Zn ), Rhadium ( Rh ), Neodinium ( Nd ), Eopium ( Eu ), Iterbium ( Yb ), Indium ( In ) and Zirconium (Zr). At measurement composition of sediment sample is acquired that heavy metal similar to result of leachate sample measurement, only Iterbium (Yb), Indium (In) not foynd, where as on sediment sample of gutter also there is heavy metal that similar to composition sample of leachate and only Indium (In) not found. The heavy metal that dominant find on sample as leachate sediment, river sediment, and gutter sediment is iron with percentage 33.664 % and rhadium with percentage 30.587 %. Heavy metal at final waste processing site Air Dingin suppose get in through metallic waste, chemical waste such as vehicles waste, waste of iron and steel, battery alectric devices, insecticide residuethat not classified weel. When wastes polish by water which get in to final waste processing site, water result of waste degradation sediment at mound of waste and flow to leachate holding wast

Easy monitoring and data record system of electric current detected by ACS712 affordable non-destructive electrical current sensor Mona Berlian Sari; Lia Yuliantini; Hafizh Prihtiadi; Mitra Djamal
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Monitoring and data record system of electric current on the current conducting wire has been developed. Recently, the current measurement was conducted by electronic circuit configuration by adding the shunt resistance in the circuit configuration. Compare to the voltage measurement, the electric current measurement has several obstacle and sometimes dangerous, especially on the AC current measurement. This study offers the automation of electric current measurement using affordable and non-destructive ACS712 Hall effect sensor. Hall effect is the phenomena of charge flow deflection in the metal plate that is placed in the magnetic field. By using this sensor, it is possible to detect the AC and DC current on conducting wires. The output of the sensor voltage will be change based on the magnetic field obtained due to current flows in the wire. Those output voltage are processed in microprocessor of ATMEGA238. Measurement results are saved in *.txt format. LabVIEW is used as the display system interface to simplify the utilization. The measurement is conducted in the Faraday cage. This system can be one of answer for the efficient and stable affordable current measurement with the precision is 0.9954 and average of accuracy percentage is 99.5934%. To reach those precision, the sensor calibration formula in datasheets should be corrected by subtracts the sensor calibration formula with the constant of 0.125.

Pembuatan alat ukur debit air menggunakan sensor aliran berbasis mikrokontroler Atmega328P Mardani Mardani
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Has successfully made the water flow measuring devices using a microcontroller based flow sensor ATmega328P. This study included research into the laboratory experiments. The measurement technique does is measure directly and indirectly. Data obtained directly is the volume of water and the length of time water flows, while the data obtained indirectly is the flow of water. Based on the analysis of data can be revealed by some studies. First, the water flow measuring devices using ATmega328P microcontroller which serves to process the output of the sensor and change the sensor output with the expected output. Display the results of measurement of water flow measuring devices using LCD. The sensor used is a flow sensor that functions calculate how many liters of water out, how the water flow and how long the water flow. Second, water flow measuring devices have accuracy percentage of 94.5% sequentially, 98.5% and 97% for debit 0,11L / s. For the percentage of accuracy, at a discharge 0,11L/s and 0,05L/s is 99 % and 100 %.

Penentuan tingkat polusi udara akibat kendaraan bermotor menggunakan metoda suseptibilitas magnetik di Kota Padang (Determination of the level of air pollution due to motorized vehicles using the magnetic susceptibility method in Padang City) Wedara Yuliatri; - Mahrizal; Fatni Mufit
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACT Air pollution in big cities has worried. Air pollution caused by human activities such as industry, motor vehicles, burning of trash, and other activities. Air pollution caused by magnetic minerals is derived from engine frictions, corrosion of motor vehicle, and gas waste products of incomplete combustion. They fly with air and cause air pollution. Therefore research about determining pollution level from motor vehicles in Padang town was necessary. The purpose of this research was to determine the level of air pollution from vehicles motor. This research used 170 sample that consist of 99 topsoil samples, 31 leaf samples, and 40 bark samples. This research used Magnetic Susceptibility method. Magnetic Susceptibility method is used to determine the Magnetic Susceptibility value of sample. It is known by used Bartington Susceptbility Meter MS2B type. Measurement is done based on massa susceptibility value. After the Magnetic Susceptibility value is known, pollution level can be determined (low, medium or high). The result of measurement show average the Magnetic Susceptibility value in all street is 1023,2 × 10-8 – 1284,6 × 10-8 m3kg-1. It is included to high pollution category. The highest Magnetic Susceptibility value is at By Pass Lubuk Begalung street with high pollution level. The highest Magnetic Susceptibility value is at distance of 0 m from the roadside, thus 1 m from the roadside and 2 m from the roadside. Keywords: magnetic minerals, Air pollution, Magnetic susceptibility

Fabrication of a 2.4 GHZ XBEE wireless communication system with sent data to support the measurement of the tipping vessel rainfall at the BMKG Sicincin Risa Noviarti; Asrizal Asrizal; Yohandri Yohandri
PILLAR OF PHYSICS Vol 9 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Information of rainfall is required in agricalture to determine kind of plant wich is suitable planted in certain area. A rain gauge had used in BMKG Sicincin wastipping bucket raingauge model TB3-0.2 serial no.92-459. This rain gauge can not be used because its data loggeris damage. Based on reality, researcher was interested to give solution by making wireless communication XBee in this rain gauge for sending data to PC. The goal of this research is to explain performance and design specification of system. Kind of this research is engineering research. Measurement technique and collecting data was executed by directly and indirectly measurement. Directly measurement was used to measure output of sensor and time of count. Indirectly measurement was used to determine accuration and precision of rain gauge. The data was analysed by using descriptive statistic and graph method. Mechanic part of system consist of tube, funnel and tipping bucket , while electronic part of system consist of sensor circuit, microcontroler circuit, RTC circuit, transmitter circuit and receiver sircuit. Precision of rain gauge in laboratory testing is 0.86, its average of accuration is 0.93 andrelative precision data transmition is 1. Accuration ofrain gauge in field testingis 0.92

PEMBANGKIT GETARAN FREKUENSI RENDAH MENGGUNAKAN SENSOR OPTOCOUPLER Yoggy Refiyon
PILLAR OF PHYSICS Vol 3 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Sensor is main component in measuring and controlling system. Somemany sensor using high technology in fabrication, like vibration sensor. It is making vibration sensor have high cost and rare. Because of that many researchers develop the vibration sensor, so that can ben get a sensor with low cost and good characteristic. To develop a vibration sensor with good characteristic needed a low frequency vibration generator as sensor calibrator. The goal of this research is knowing performance and design specification of low frequency vibration generator using optocoupler sensor. Kind of this research is laboratory experiment, and measurement technique and collecting data executed by directly and indirectly. Directly measurement is measuring output of sensor and time of count. Indirectly measurement is to determine accuration and precision of instrument. The data obtained through measurement analyzing in two methods, statics and graph. There are two result of this research, that are 1. Vibration generator that have two box casing( mechanical and electronic box), 2. Accuration of sensor is 94.4% with average of correctness 0.95477. Accuration average of vibration generator is 0.98 and the precision is 0.976. Keyword: vibration generator, low-frequency, seismic sensor, calibrator, optocopler counter

Sintesis dan karakterisasi sifat optik film tipis hausmannite (Mn3O4) dengan metode spin coating ( Synthesis and characterization of the optical properties of hausmannite thin film (Mn3O4) by spin coating method ) Bevi Lidia; - Ratnawulan; - Ramli
PILLAR OF PHYSICS Vol 11, No 2 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Hausmannite is applied as a semiconductor electronics material one of them as optoelectronic material. The purpose of this research is to investigate the influence of calcination temperature on the growth of thin film by spin coanting method against the optical properties of hausmannite. Based on the results of the value of transmittance and reflectance of the thin film of hausmannite decreases at a temperature of 200 °C to 400 °C then enlarges at a temperature of 500 °C. And the absorbance value of the thin film of hausmannite enlarges at a temperature of 200 °C to 400 °C and then shrinks at a temperature of 500 °C. Using the value of transmittance obtained large energy gap at the temperature calcination 200 °C, 300 °C, 400 °C and 500 °C is 1.53 eV, 1.64 eV, 2.26 eV and 2.28 eV.

analysis on electromagnetic waves propagation in optical fiber using the Laasonen method finite difference approach Radhiyah Mardhiyah
PILLAR OF PHYSICS Vol 4 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Wave Nonlinear Schrodinger (NLS) is a wave that propagates in an optical fiber. NLS wave has a wave with wave propagation characteristics are stable and propagate without change of shape. This study aims to examine and analyze the behavior of wave propagation NLS with the influence wavelengths (Nλ) on its amplitude. Research conducted including the type of basic research using a numerical approach. Used numerical approach is the Finite Difference Laasonen method. Based on the generated soliton solutions, the wave nature of the NLS can be analyzed which shows that large amplitude (A) NLS waves is influenced by the wavelength (λ). Results of programming in the form of a graphic display output and modeling. Modeling results for the NLS equation wavelength waves (N=1) which is comparable to the wavelength of the amplitude values. Modeling results for the wavelength variation (N=2) also showed that the wavelength is proportional to the amplitude

Pengaruh komposisi CoFe2O4 terhadap sifat magnetik nanokomposit CoFe2O4/PVDF yang disintesis dengan metode sol gel (The effect of CoFe2O4 composition on the magnetic properties of the CoFe2O4 / PVDF nanocomposites synthesized by the sol gel method) Sovia Yulianti; - Ramli; - Yulkifli; Yenni Darvina
PILLAR OF PHYSICS Vol 13, No 1 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Cobalt Ferrite (CoFe2O4) is a magnetic material that has high coercivity, magnetic properties, and has electrical resistivity and high saturation magnetization, very suitable for applications in the field of magnetic, magnetic sensors, magnetic sensor constituents, biomedical materials, Magnetic Resonance Imaging (MRI) and hypertamia. The purpose of the survey is to explain the composition of the CoFe2O4 composition on the magnetic properties of the CoFe2O4 / PVDF nanocomposites synthesized by the Sol-Gel Method. There are three research results from vsm test data on hysteresis curves. First, the magnetization saturation data of each variation obtained results of 2.07 memu, 0.97 memu, 2.18 memu, 1.07 memu, and 0.91 memu. Second, the Remanent Magnetization data obtained results are 0.41 memu, 0.28 memu, 0.35 memu, 0.27 memu, and 0.16 memu. Third, the Medan Coercivity data is 208.31 Oe, 293.42 Oe, 163.20 Oe, 335.88 Oe, and 93.86 Oe.

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Editorial Address Department of Physics Universitas Negeri Padang UNP Prof. Dr. Hamka Street, Air Tawar, Padang 25131

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Contact Name
Syafriani

Contact Email
syafri@fmipa.unp.ac.id

Phone
+6281267996692

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fisikasains@fmipa.unp.ac.id

Editorial Address
Department of Physics Universitas Negeri Padang UNP Prof. Dr. Hamka Street, Air Tawar, Padang 25131

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Kota padang,

Sumatera barat

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