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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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Experiment modeling tool development wheels related to the control advance for video tracker analysis - Harviyani; - Asrizal
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The concepts explained by Physics can be the basis for the development of new disciplines. Theory explains the results of experiments carried out and subsequent experiments.Observations prove that experiments using manual tools still have many shortcomings . Physics parameters that can be displayed are still a bit of a weakness.This problem can be overcome by modeling tools that analyzed the video using a tracker.This study aims to determine the accuracy, accuracy, and resolution of controlling the speed of a DC motor, determine the performance specifications of the related wheel experimental model modelingtool, determine the accuracy and accuracy of the related wheel circular motion modeling tool, determine the physical magnitude and influence of each of the wheel relations of the modeling tool. This research is classified into laboratory experiment research method. Laboratory experiments are researches that apply science into a design to get performance as expected. Direct measurement is done by varying the speed and type of wheel connection. Indirect measurements are carried out analysis using a tracker software with the resulting data is linear velocity and angular velocity. Data analysis carried out revealed four research results. The performance specifications which consist of a circular motion modeling tool related to the length of 35 cm, width 5 cm and height 20 cm by controlling, average value of accuracy and accuracy of DC motor rate control are 99.06% and 99.55%, respectively. Accuracy value for linear velocity is 99.35%, accuracy at angular velocity is 99.63%, and the accuracy value of each relationship is> 95%. Tangent wheel has the same linear velocity value, different angular velocity , and opposite wheel rotation direction . Centralized wheels have different linear speeds, angular speed and direction of wheel rotation are the same. The wheels connected by ropes have the same linear velocity and direction of rotation of the wheels, different angular velocity values.

Pengaruh waktu milling terhadap ukuran butir forsterite (Mg2SiO4) dari batuan dunit di daerah Jorong Tongar Nagari Aur Kuning, Kabupaten Pasaman Barat Vera Firmansari
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Dunit made with material engineering techniques will bring up a new phase is forsterite. Forsterite has economic value. Forsterite in the formed nanoparticle size can be used as a coating material in the iron and steel melting place because the size of the nano has properties very strong, hard, and resistant to corrosion. The purpose of this study was to investigate the influence of milling time on grain size forsterite of rock dunit. Type of research is experiment. Method of research is forsterite synthesized by mechanical activation using the High Energy Milling 3D Ellipse to obtain nano grain size of forsterite. The results of the milling characterized using X-Ray Diffraction and Scanning Electron Microscope. The results of this study show the crystal structure that is formed during the milling time 5 hours, 10 hours, 20 hours, 40 hours is orthorhombic. Result of Scanning Electron Microscope the grain size of nanoparticle forsterite for variation milling 5 hours, 10 hours, 20 hours, and 40 hours are 630 nm, 717 nm, 454 nm dan 354 nm

EFFECT OF COMPOSITION VARIATION ON CRYSTAL SIZE OF MnO-Fe₂O₃/PS NANOCOMPOSITE LAYER AS SELF CLEANING Dafri Zaldi; - Ratnawulan
PILLAR OF PHYSICS Vol 14, No 1 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/11370171074

This research is based on the abundance of natural materials such as manganese and iron ore. Manganese is usually used for metal coating and has durability so that it is rich in properties to be used for various purposes in the chemical, pharmaceutical, and technological industries. Meanwhile, iron ore is a stable type of oxide so that it has strong properties and is not easily corroded. This research is a type of experimental research conducted at the Laboratory of Material Physics and Biophysics Faculty of Mathematics and Natural Sciences (FMIPA), Padang State University (UNP), and the Chemistry Laboratory of FMIPA UNP. The tools used are HEM-3D, XRD, and UV-VIS. The precursors were prepared by varying the composition of the ratio of MnO-Fe₂O₃ and PS respectively 0,2:0,2:1 ; 0,4:0,4:1 ; 0,6:0,6:1 ; 0,8:0,8:1 ; 1:1:1. This coating is made by means of the spin coating method and uses a temperature of 60 ° using a oven. The results of this study are the maximum crystal size obtained in MnO is 61.26 nm, Fe₂O₃ is 50.45 nm, and MnO-Fe₂O₃ is 53.08 nm. Also, the maximum% degradation produced is 65.97% in a methyl orange solution, this shows that the MnO-Fe₂O₃/PS layer is well degraded. This degradation ability is known as self cleaning because it is able to break down dirt.

Design simulation of microstrip array antenna with low sidelobe level for synthetic aperture radar sensor Alvissda Damai; Asrizal Asrizal; Yohandri Yohandri
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The simulation of design of rectanglemicrostrip array antenna is presented in this paper. The proposed antenna is designed operate in 1.27 GHz (L-band) and consists of three element of the patch. The CST Studio Suite is employed in this simulation to optainethe low sidelobe level. This work aimed to produce the satisfyantenna characteristics for the SAR sensor. The low sidelobe level of the antenna is generated using Taylor Line Source method. Based on the simulation result, the antenna parameter such as S11, VSWR, impedansi (z) is -29.74 dB , 1.06, 50.05 ohm, respectively. the magnitude mainlobes = 11.3 dB and value side lobe level for Ө = -60o is 16.6 dB, and for Ө = 60o is 20.3 dB. The results of this simulation enough to fulfill characteristic antennae mikrostrip array with a lobes side greater than 15 dB.

PENGEMBANGAN ALAT UKUR SUHU UDARA DIGITAL BERBASIS MIKROKONTROLER ATMEGA32 MENGGUNAKAN SENSOR SHT75 Nofri Hardisal
PILLAR OF PHYSICS Vol 3 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Temperature is important weather parameter measured for many necessity, such as agriculture, pharmacy, and etc. In Indonesian Agency of Meteorology, Climatology and Geophysical, this parameter measured by using analog termograph with mechanic sensor is bimetal sensor. The purpose of research is development of Dygital air temperature measurement based on microcontroller Atmega32 by using SHT75 sensor with storage data in memory possesed of highest accuration and already calibrated of dygital with storage data in memory. There are three result of research such as. First, instrument built from sensor SHT75 module as sensor of temperature and box of system have 22x21x16 cm volume as place of electronic circuit. Second, data logger of instrument used internal EEPROM in Microcontroller ATMEGA32. Third, this instrument have highest precision and accuration, average of precision relative sensor SHT75 is 98,93% with average of accuration 0,999. Keyword --- Alat Ukur, Suhu, Sensor SHT75

Deteksi sebaran gas metana (CH4) di TPA Pakusari Jember menggunakan sensor TGS 2611 (Detection of methane gas (CH4) distributionin at TPA Pakusari Jember using TGS 2611 sensor) Sri Indariyatul Masruroh; Bowo Eko Cahyono; Agung Tjahjo Nugroho
PILLAR OF PHYSICS Vol 12, No 1 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Waste is an important issue in urban environments and will continue to be faced by governments and communities. Most waste disposal sites are concentrated in the Final Disposal Site (TPA). Waste accumulation in the landfill can create methane gas which can spread to the environment. The purpose of this research is to know the application of TGS 2611 sensor as methane gas detector and use it to measure methane gas distribution at TPA Pakusari Jember. This research is conducted by detecting the distribution of methane gas in TPA Pakusari. Data retrieval is performed by placing the sensor directly above the garbage pile and then observe the voltage value that appears on the LCD screen. The obtained data of voltage values are normalized and then they are visualized into 2 dimension contoure graph by using Matlab application. The results show that methane gas in TPA Pakusari is not spread evenly but it spreads randomly. This is due to the unequal garbage composition and the height random garbage at each measurement point. The largest methane gas is located in the area of the pile of organic waste that suffers from decay and the lowest methane gas is located in areas with little piles of rubbish and dominant with the soil. Thus it can be concluded that TGS 2611 sensor can be applied to detect the spread of methane gas in TPA Pakusari Jember.

Relatioship between basic composition of magnetic mineral and magnetic suseptibility value of guano from Bau Bau cave East Kalimantan. Nurul Garnetsya D Rusli
PILLAR OF PHYSICS Vol 4 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Identification of magnetic susceptibility value and element composition of this research is done by guano sample from Bau-Bau caves in East Borneo. This cave topography is far from human activity and there is no volcano around it. This topography conditions will effects to the transportation process of magnetic mineral into caves area. Magnetic mineral characterization such as magnetic susceptibility and element composition could show the enviromental changes in the cave at the time of guano deposition process. This research aims to determine the elemental composition of the basic constituent asociation of magnetic mineral to the magnetic susceptibility values of guano samples. Determination of magnetic susceptibility value done by using Susceptibility Meter, whereas to determine the element composition we use the X-ray Fluorescences (XRF). Data analisys is done by using the plotting of data from elemental composition of the fourth group in the transition graph. Thus it making visible the relation between the value of the magnetic susceptibility with the basic elements magnetic up the composition of magnetic minerals in perticular Fe, then we could seen the composition of Fe proportional to the magnetic susceptibility value. Fe composition will appears in high presentation on the time of susceptibility value is high and will appears in low presentation when the susceptibility values is low. An the other hand, element composition of the fourth group in the transition except Fe with magnetic susceptibility value is not really appears

Analisis kondisi pasang surut dengan waktu kejadian gempabumi Sumatera Barat (Analysis of tidal conditions with the time of the earthquake in West Sumatera) Elka Fitri Enora; Letmi Dwiridal
PILLAR OF PHYSICS Vol 13, No 1 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Tides are a phenomenon of movement of the ups and downs of the surface of the sea water at intervals caused by a combination of the gravitational force and the attractive force of celestial bodies, especially by the sun, earth and moon. Earthquake events can occur from earth rock rock fractures by forces (including gravitational forces) that are collected slowly, and earthquakes can also occur if the stress shear causes the force to exceed the strength of the rock, causing deformation. Analysis of tidal conditions with the time of the West Sumatran earthquake in the period 2009-2019. The increase of tides in the period 2009 is on the 2009-09-30 has a depth of 79 km above sea level which is in the Mentawai Islands. Meanwhile, in the year 2010 there are 2010-10-25 has a depth of 10 km above sea level in the Mentawai Islands. In 2011 it was in the year 2011-08-04 had a depth of 41 km on sea level in the Mentawai Islands. While in the period 2016 there are 2016-06-01 has a depth of 69 km above the surface of the sea water in the Siberut estuary. In the period 2018 there are 21/04/2018 has a depth of 35 km are in the Siberut estuary.

Identifikasi mineral magnetik menggunakan metoda X-Ray Diffraction (XRD) Terhadap Polusi di Kota Padang Catur Krisna Gobah
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Many industrial processes such as the production of steel and cement, generate airborne magnetic material. That Particle to contained organized as magnetic mineral included kind of iron sulfide mineral and iron titanium sulfide. Industrial process using as a power plant in that process. Before being burned, coal is essentially nonmagnetic. The process of combustion causes the pyrite present dissociate and form pyrrhotite and sulfur gas. Above about 1350 K, pyrrhotite decomposes into sulfur and iron. Spherical iron particles are formed and subsequently oxidize to magnetite. This research intent on determine level of pollution and kind of magnetic mineral in a pollutant of padang city by undertaking measuring value of magnetic suseptibilty. By assume topsoil as a pollutant collector, so making use topsoil as a sample in this research. Measuring value of magnetic suseptibility by using magnetic suseptibilitymeter . Then identification kind of magnetic mineral by using a X-Ray Diffractometer (XRD). Data prosessing output of XRD organized as chart for know the kind of magnetic mineral. Data output from measuring value of magnetic suseptibility for know the pollution levels. Result of this research magnetic mineral has present in the Padang city magnetite is a big part. Hematite is a other mineral magnetic omly one sample contained that magnetic mineral just in sample KTT 06this sample taking at Lubuk Buaya, Koto Tangah subdistrict.

Cover, Dewan Redaksi, Daftar Isi Pendahuluan Jurnal
PILLAR OF PHYSICS Vol 11, No 1 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

CoverDewan RedaksiDaftar isi

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Home Page

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

Location Kota padang, Sumatera barat INDONESIA

Abstract

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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