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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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Analisis tingkat kerentanan seismik di Sumatera Barat berdasarkan nilai percepatan tanah maksimum dan intensitas maksimum (periode data gempa tahun 2007-2017) (Analysis of the level of seismic vulnerability in West Sumatra based on the value of maximum ground acceleration and maximum intensity (earthquake data period 2007-2017) ) - Mandasari; - Syafriani; Rahmat Triyono; Robby Hendra
PILLAR OF PHYSICS Vol 11, No 2 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

A research on seismic vulnerability analysis in West Sumatera has been conducted based on maximum land acceleration and maximum intensity (Earthquake Data Period 2007-2017). This study used the empirical formulation of Mc.Guirre, Si and Midorikawa and Donovan to find the maximum ground acceleration value and the empirical formula of Murpy O’Brien was used to calculate its maximum intensity. The reference point used to calculate the maximum land acceleration value and the maximum intensity with 19 districts/cities in the region of West Sumatera. The research data used are data of earthquake recorded in BMKG Padang Panjang from February 2007 until December 2017 located in West Sumatera region with coordinated 3030’LS-0054’LU and 960BT-1020BT. Earthquake magnitude used in 5.0 SR-8.1 SR with 10-208 km depth of earthquake. Determining the seismic susceptibility level based on the calculation of maximum land acceleration and maximum intensity value using Mc.Guirre empirical formula ranges from 24.93 Gal-138.79 Gal and its maximum intensity V MMI-VI MMI. For the empirical formula of Si and Midorikawa the maximum ground acceleration value ranges from 13.50 Gal-348.31 Gal and its maximum intensity V MMI-VIII MMI. As for the empirical formula of Donovan the maximum land acceleration value is 6.04 Gal-34.47 Gal and itsmaximum intensity ranges from III MMI-V MMI. Based on the calculation of the three empirical formulation used, the level of seismic vulnerability in Sumatera region that has the highest value based on the maximum land acceleration value and maximum intensity is in the Kep. Mentawai region is at a very large risk level one.

Identification of guano magnetic mineral types from Bau Bau cave in East Kalimantan, using x-ray diffraction (XRD) Dolla Yuliza Pertama
PILLAR OF PHYSICS Vol 4 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The existence of minerals magnetic guano can be identified by knowing the kind of the minerals magnetic contained in guano. This research is to identification the kind of minerals-magnetic-guano from Bau-Bau Cave, East Kalimantan. The kind of minerals magnetic are Identified using X-Ray Diffraction (XRD). Kind Minerals magnetic is determined by comparing the measured data with database of minerals. The measurement results showed that the guano samples have a mineral magnetic content. Kind of minerals magnetic in guano is magnetite (Fe3O4), it can be seen from the pattern at XRD measurements fractions. Data analysis showed that there are minerals magnetic in guano, it is happen because minerals magnetic transport from environments in to the cave

Pengembangan sistem pengontrolan konduktivitas listrik larutan berbasis internet of things untuk tanaman hidroponik (Development of the electrical conductivity control system in the solution based on the internet of things for hydroponic plants) Weli Erlina; - Asrizal
PILLAR OF PHYSICS Vol 13, No 1 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Hydroponics has become an alternative for people who want to garden, but they didn’t have enough space to grow crops. The most important problem that must be considered in hydroponic cultivation is the provision of adequate nutrition for plants. Inappropriate electrical conductivity values will result in undesirable things. Controlling conductivity in plants hydroponically is required so that the plants get the value of conductivity that accordingly. The purpose of the research is to determine the performance spesifications of the electrical conductivity control system, determine the effect of adding AB Mix solution to the conductivity and output voltage values, determine the accuracy and precision of the electrical conductivity control system on laboratory scale tests, and determine the results field scale test on the conductivity control system. This research is classified as research and development which is a research method used to develop products. Based on the results of data analysis, it can be concluded that there are four research data results. First, performance specifications which consist of sensors to measure electrical conductivity values, a circuit box containing a Node Mcu and a relay to drive the solenoid valve in the event of control. Second, the effect of adding AB Mix is directly proportional to the value of the conductivity. This means that the more the addition of solution AB Mix then the greater value output voltage. Meanwhile, the determine of the output voltage value the greater with the addition of solution AB Mix. Third, the results of the accuracy and presicion of the electrical conductivity control system of 98.98% and 97.40%. That is, the measurement and control data can be used because it is close to 100%. Third, the results of field scale tests that have been carried out for 3 days get varied data. Electrical conductivity values obtained during the field scale tests from 690 ppm up to 945 ppm.

Identifikasi jenis dan ukuran bulir mineral magnetik pada lindi tempat pembuangan akhir (TPA) sampah Air Dingin Kota Padang menggunakan metode X-Ray Diffraction (XRD) Robi Marcian
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

A cities or urban areas having large population growth should be supported by the provision of advice and good infrastructure such as a waste management. Padang municipal waste management is done by the method of removal of garbage from disposal temporary to the final disposal that generate wastewater that leachate emanating from the garbage. Leachate is a liquid yellow, brown or black, and result from the decomposition process due to ingress of water, whether it is rain water or ground water, into a pile of garbage. If not managed properly, the surface of the water used by residents around the landfill is likely contaminated by pollutants called leachate (liquid waste / leachate). Mngetahui This study aims to determine the type and size of magnetic mineral grains in landfill leachate Air Dingin of Padang using X-Ray Difraction (XRD) Characteristing magnetic minerals is done using X-Ray Difraction (XRD) aims to determine the type of magnetic minerals and the size of the grains in the leachate. This study uses nine samples taken from 5 points leachate ponds, 2 points on the river, and 2 points of the gutter landfill Air Dingin of Padang. Samples of leachate pond, river, ditch and first extracted by using methanol bath soap that aims to separate the magnetic and non-magnetic minerals. Type of magnetic minerals can be determined by analyzing the peaks of the intensity of the XRD measurement results using Bragg law, while the grain size can be determined using the equation Scherrer. After analysing, the results showed that each sample contains the same type of mineral is magnetite (Fe3O4) which derived from the source - that is Anthopogenic. Magnetic mineral grain size of samples gutter Final Disposal (TPA) Air Dingin of Padang classified multi-domain (MD). Magnetite has the largest size is 193.25 μm with an average grain size of 63.90 lm

Uji kualitas telur ayam ras terhadap lamanya penyimpanan berdasarkan sifat listrik (Quality test of eggs on the length of storage based on electrical properties) Dela Prawita Mulza; - Ratnawulan; - Gusnedi
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACT Many people like eggs because the price is cheap eggs also have high nutritional value, but not many know the influence of duration of storage on the quality of eggs. The purpose of this study was to determine the value of capacitance and electrical conductivity of the white and yellow eggs are stored in the refrigerator and the room is open for 30 days. Measurement of capacitance using a parallel plate capacitor chip connected to the LCR meter using a frequency of 1 KHz, 2 KHz, 3 KHz, 4 KHz and 5 KHz, while the value of measuring the electrical conductivity of the white and the yolk are used konduktivity meters. The results obtained that the duration of the storage effect on the quality of eggs. Capacitance values of the white and the yolk are stored impaired during storage, as well as the capacitance value for the eggs stored in the refrigerator, but do not drop too much and tend to be stable, the frequency affects the capacitance value the lower the frequency the greater the capacitance value obtained . Value conductivity values also decreased during storage, the decline is evident in storage 26 days to 30 days, the eggs conductivity values stored in the refrigerator also decreased but the values obtained stable.Keywords: eggs, white and yellow eggs, capacitance, conductivity.

DESAIN antena mikrostrip jajaran genjang pita-C untuk aplikasi sensor synthetic aperture radar (SAR) Ruri Oktavia
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Remote sensing technology sensor using synthetic aperture radar (SAR) is a type of radar sensors using methods photographing area or object being observed. SAR sensors require an antenna with a light and simple specification. Microstrip antenna has the advantage of physically simpler and easily manufactured. Parallelogram shape microstrip antenna using microstrip line is simpler and has a bandwidth is wider than the rectangular microstrip antenna using a proximity coupling. The purpose of this study is to produce a parallelogram microstrip antenna capable of working at a frequency of 5 GHz. This study simulate microstrip antenna design parallelogram. The simulation was performed by varying the dimensions of the antenna. The influence of the dimensions of the antenna to antenna characteristics are used as a reference to get the dimensions of the antenna and antenna characteristics parallelogram for SAR applications. The device used in this simulation is IE3D software with the type of substrate Nippon Pillar Packing (NPC-H220A), the dielectric constant of 2.17, thickness of 1.6 mm and loss δ = 0.0005. From this research can be presented three result. First, measure the dimensions of a single microstrip antenna parallelogram using microstrip line portion length L = 25.6 mm radiator and width of rationing lf = 8 mm. Second, the greater the length of the antenna radiator then lower the operating frequency and vice versa. The width of rationing affect the size of the antenna input impedance of the greater width of rationing, the input impedance is getting smaller, and vice versa. Third, the antenna dimensions are used to determine the model of the desired antenna characteristics resulting operating frequency of 5 GHz with the reflection coefficient -35.33 dB, 48.59 Ω input impedance and VSWR of 1.035

Identifikasi Kandungan Mineral Magnetik Guano di Gua Solek dan Gua Rantai Menggunakan Metode Scanning Electron Microscope (SEM) Wardina Nasution
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The guano’s Cave Solek and Cave Rantai has a large magnetic susceptibility values. The value of magnetic susceptibility shows large concentrations of magnetic minerals contained in the cave. Based on the magnetic susceptibility values can be specified types of magnetic minerals. Determination type of magnetic minerals have done before by using the method of rock magnetization IRM and XRD methods, however, to see the surface morphology and elemental composition of magnetic minerals have not been done. The research to make identification surface morphology and composition of guano magnetic minerals in Cave Solek and Cave Rantai use Scanning Electron Microscope (SEM). The writer hope this research can confirm of true result in this measuring with other methods of rock magnetism. This research used SEM instrument combine with EDS type Philips CM 12 pw 6030. There are 7 samples used in this research devided by 4 samples from Solek Cave and 3 samples from Rantai Cave. Guano samples take based variation of the magnetic susceptibility that has been known previously. The observation of measuring about surface morphology of guano samples Cave Solek and Cave Rantai use SEM image magnification can not be analyzed because it that is too small. Therefore used by EDS analysis showed that the chemical elements forming magnetic minerals. The result of EDS identification show of magnetic mineral content Solek Cave and Cave Rantai dominated by a mineral that consists of the element iron (Fe) and oxygen (O) which is a magnetic mineral-forming elements of the group that is titanium magnetite of iron oxide (Fe3O4), hematite (Fe2O3) and ilmenite (FeTiO3), in addition it be found as well mineral nonmagnetic an element of such as the andalusite (Al2SiO5), siderite (FeCO3) and quartz (SiO2). Keywords: Guano, Consentration of Magnetic Mineral, Surface Morphology, Elemental Composition of Magnetic Mineral SEM and EDS.

Cover, Dewan Redaksi, Daftar Isi Pendahuluan Jurnal
PILLAR OF PHYSICS Vol 11, No 2 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Journal of Physics Vol. 12 No. 2, Oktober 2018 memuat 11 artikel penelitian di bidang fisika antara lain fisika instrumentasi dan elektronika, fisika kebumian dan fisika material.

Numerical analysis of un-steady heat distribution in heatsink using finite different method Fahendri Fahendri
PILLAR OF PHYSICS Vol 4 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Heatsink is one of the multiple device of coolant on computer or electronics device commonly made of metal. Heatsink as cooler is very interesting to be analyzed the model of its heating distribution. The purpose of the research is to analyse the model of transient heating distribution and the influence of material heatsink at the model of heat distribution which is produced. The methods which is used on the research is finite different that functions to get model of heating distribution. It is a the descriptive research namely modeling heat distribution at heatsing and comparing it with existing theory. The result of research indicates that heat distribution model at heatsink is almost spread evenly. The material of heatsink has an influence towards heat distribution of heatsink. The large value material of conductivity has a better heat distribution

Pengembangan tool pemodelan eksperimen gerak melingkar beraturan dengan pengontrolan laju motor DC berbantukan analisis video tracker (Development of experimental modeling tools for regular circular motion with DC motor speed control assisted by video tracker analysis) Cici Putri; - Asrizal
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The development of technology and information can provide influence on the progress of Science and Technology. Improved science is supported by the role of media and digital technology. Physics is one of the sciences relating to experimental activities. One of interesting is the phenomenon of uniform circular motion. Based on observations were known that the experimental activities use manual tool that have limitations in displaying measurement data. This problem can be solved by modeling tool with video tracker analysis. The purposes of the research were to determine the performance specifications of the uniform circular motion experiment modeling tool, determine the accuracy and precition of controlling the DC motor speed, determine the accuracy and precition of the uniform circular motion modeling tool, determine the parameters of physics and their influences on the experiment of uniform circular motion. This research method was called research and development which is a research method used to validate and develop products. Based the research can describe four results. The first, performance specification consisted of a uniform circular motion modeling tool of 20x20x10 cm by controlling the speed of a DC motor. Second, the accuracy and precition of controlling the DC motor speed with values of 98.85% and 98.54%. Third, the accuracy and precition of the uniform circular motion modeling tool with an accuracy value of 98.67% and precition value of 97.70%. Fourth, the frequency and angular velocity will be greater by using a higher speed value. However, the period value decreases as the speed increases. The influence of physics parameters is done by using variations in speed and radius. Speed is inversely proportional to period. However, speed is directly proportional to frequency and angular velocity. The effect of the radius variation is the centripetal acceleration is directly proportional to the radius

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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

Journal Mail Official
fisikasains@fmipa.unp.ac.id

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

Location
Kota padang,

Sumatera barat

INDONESIA