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Syafriani
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INDONESIA
Pillar of Physics: Jurnal Berkala Ilmiah Fisika
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 6 Documents
 1 
Search results for , issue "Vol 14, No 1 (2021)" : 6 Documents clear
HAZARD SEISMIC ZONATION ANALYSIS OF WEST SUMATRA REGION USING PROBABILISTIC HAZARD SEISMIC ANALYSIS (PHSA) METHOD Mudzullah Rajif; Syafriani Syafriani
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: 10.24036/10753171074

Abstract

Indonesia is one of the countries that is prone to high intensity seismicity, where Indonesia is located between three main plates, namely the Eurasian plate in the north, the Indo-Australian plate in the south and the Pacific plate in the northeast. As a result of the meeting of the three plates, Indonesia has a high level of seismicity both on land and at sea. One of the provinces with a high level of earthquake hazard is West Sumatra. Seismic hazards are useful in designing earthquake-resistant buildings and can describe the effects of earthquakes at a location which will help in anticipating community preparedness and earthquake disaster mitigation efforts. This type of research is descriptive, namely by collecting catalog data for the NEIC / USGS earthquake with the period 1969-2019 with M ≥ 5 S.R. Seismic hazard data processing uses the probabilistic seismic hazard analysis (PSHA) method. PSHA is based on earthquake parameters that produce the greatest ground motion. The magnitude of the intensity at a location due to an earthquake in the earthquake source area with a magnitude M and a distance of R can be used as an attenuation function. The attenuation function used in this study is Joyner-Boore (1997) and Young et al (1997). The results show that the largest seismic hazard occurs in the PGA with a maximum range of 1.28 g - 3.69 g in the Mentawai Islands region. The seismic hazard level is in the Bukit Barisan area with a maximum PGA value of 1.72 g - 2.12 g.
Land subsidence estimation using DinSAR method ALOS PALSAR image in Padang City West Sumatra, Indonesia Rahmi Sukmawati; Mirza Muhammad Waqar; - Syafriani; - Yohandri; Joshapat T. Sri Sumantyo
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 | Full PDF (921.497 KB) | DOI: 10.24036/10673171074

Abstract

Land subsidence is a phenomenon that occurs in big cities around the world and in Indonesia. Padang as one of the largest cities in West Sumatera also facing land subsidence due to natural phenomena and human induced. Padang City is located at the west coast of Sumatera Island which is the junction point of three active plates that cause frequent earthquakes. Main goals of this research are to know the distribution of area affected by land subsidence, to know the estimated value of land subsidence and to know the value of the velocity of land subsidence in Padang area using DInSAR method. The data used in this study is ALOS PALSAR Image Level 1.1 of Padang city during 2007 to 2010 was obtained through JMRSL CERES Chiba University, Japan and collected through Alaska Satellite Facility website. Differential Interferometric Synthetic Aperture Radar (DInSAR) is a technique considered to be one of the most efficient technique for detecting land subsidence. The DInSAR method is used in mapping altitude changes developed into a land-subsidence map each year. The mapping results show the distribution of the areas affected by the maximum land subsidence in Padang area of West Sumatera are Padang Utara, Nanggalo, and Padang Barat Subdistricts. The land subsidence insignificant occurred is Padang Selatan and Lubuk Begalung Subdistricts. The estimated value of the land subsidence distribution in Padang area using DInSAR method has decreased significantly after the earthquake of September 30, 2009 in Padang Utara, Nanggalo and West Padang Subdistricts is around 0 - 32.70 cm, and the value of land subsidence velocity is around 0.13 - 12 cm/year. One of the expected effects of land subsidence can be increased in the area susceptible for flooding in Padang city.
DEVELOPMENT OF COORDINATIONS TEST SYSTEM BASED ON ARDUINO Adibil Mahdi Rahmad Hidayat; Yohandri Yohandri
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: 10.24036/10016171074

Abstract

ABSTRACTIn sports activitiesaplaying tennis ball, a player will appear to haveagood coordination if he can move towards the ball while swinging his racket, then hit with the correct technique. At the moment, the catch and throw exercise is still counted manuallyowith the help of other people and is not veryieffective at doing it. catch is a test to determine the coordination between the eyes and hands using a tennisoball as a throw. The purpose of this study was to determine the performancetspecifications and designwspecifications of the Arduino-based fishing throwing tool to measure eye-handkcoordination. This re search includes engineering research. This study describes the performance specifications and designhspecifications of the catch and capture tool. The performance aspecification describes the function of the catch-and-catch tool builder, while the design specification describes the precision and precision of the tool. The measurement technique is carried out directly and iindirectly. Direct measurementscare made of the vibration and light intensity, while indirect measurements are carried out by analyzing the accuracy and accuracy of the catch and throw tool. The results of research on performance specifications and designuspecifications. First, the performance specification of the catch and catch device consists of an LDR sensor, a vibration sensor, and an electronic circuit that builds a catch-and-catch system. The secondaresult, the results of the design speccifications of this study consisted of the characterization of the tools and the accuracycof the catch and throw tool. The accuracy value of the catch throw tool is 100%.
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

Abstract

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.
THE EFFECT OF HYDROPHOBIC CALCINATION TEMPERATURE VARIATION OF SILICA / POLYSTYRENE COMPOSITE (SiO2 / PS) ON THE DURABILITY OF SELF CLEANING MATERIALS Dila Juliawati; Ratnawulan 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: 10.24036/11369171074

Abstract

Nature possesses functional architectural and surface characteristics. The functional surface is one of the surfaces of taro or lotus leaves which has water-repellent (hydrophobic) properties. Water repellency is the ability to form on surfaces that escape from water (such as glass, ceramics, etc.). The purpose of this study was to determine the resistance of the surface layer on the SiO2/PS layer which is expected to be used for self-cleaning applications using calcination temperatures of 30oC, 60oC, 90oC, 140oC and 180oC for 1 hour using a furnace. This research is a type of experimental research conducted at the Material Physics Laboratory of FMIPA and the FMIPA Chemistry Laboratory, Universitas Negeri Padang (UNP). This study uses a HEM-3D (High Energy Milling Ellipse-3D Mention) tool. The precursor was made by giving the composition of 0.5 grams of polystyrene (PS)  and 0.2 grams of silica powder. Coating is done by using the spin coating method and giving the calcination temperature using a furnace. The results of this study were the variations in the calcination temperature of the SiO2 / PS composite hydrophobic on the resistance of the coating showed a change in the contact angle. Largest contact angles at temperatures of 60oC and for durability using contact angle tests with a distance of several days. The change in the contact angle decreases greatly, but the value of the contact angle is greatest at 60oC.
THE EFFECT OF ADDITIONAL SALT AND ACID ON THE HYDROPHOBIC LAYER OF NANOCOMPOSITE SILICA/POLYSTYRENE (SiO2/PS) ON THE STABILITY PROPERTIES OF UV Yola sri Wahyuni; - 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: 10.24036/11350171074

Abstract

In nature there is a phenomenon. Which this phenomenon can be seen in the lotus leaf and taro leaves. a phenomenon called hydropobic (water repellent) properties. This research is a previous research. On application, the hydrophobic coating will mostly break down quickly when applied outside or in harsh environments. So it is very important to develop a durable hydrophobic layer, especially the stability properties against Ultra Violet (Uv). Therefore, this study aims to see the effect of adding salt and acid to the hydrophobic silica / polystyrene nanocomposite (SiO2 / PS) layer on the stability of the Uv. with a polystyrene composition of 0.5 grams and 0.2 grams of silica powder and 0.4 grams of salt and 0.4 grams of acid. The coating method used is the spin coating method and the Uv stability test on the hydrophobic layer is done by drying the layers for one hour under direct sunlight. The results of this study were the contact angle measurements using imagej software, and the crystal grain size by SEM (Scanning electron microscop). UV stability can be seen by changing the contact angle in each sample where the contact angle that can be before irradiation is acid added salt (120.1490C), salt (100.3630C), acid (128.5910C), without mixture (133.6680C) ) and after irradiation is. Salt (92.970C), unmixed (98.1440C), acid added salt (92.1150C), acid (141.5750C). These results may indicate that acid coating is more likely to use hydrophobic / self-cleaning surfaces in harsh environments such as high Uv irradiation, and outdoor applications.

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