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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 16 Documents
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Search results for , issue "Vol 8 (2016)" : 16 Documents clear
Analisis hubungan angin zonal dan angin meridional lapisan 850 milibar terhadap curah hujan di Sumatera Barat Lili Sartika
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (809.454 KB) | DOI: 10.24036/2490171074

Abstract

This study was conducted to determine the effect of zonal wind and meridional wind layer 850 millibars to rainfall in Sumatra Barat. Additionally, it also obtained the pattern of both zonal wind and meridional wind that give impact to rainfall in West Sumatra. This study used rainfall data that were taken monthly, wind zonal and meridional winds of 850 millibars layer equivalent to 1.4 km from 1998 to 2015. Defining relationships zonal wind and meridional wind on the distribution of posts precipitation of rain in three regions, ie the waterfront area, mountainous regions and areas behind the mountains. The division of this region to give a picture of wind patterns that affect rainfall in West Sumatra. Influence of zonal wind and meridional wind to precipitation was analyzed using canonical correlation analysis using software Climate Predictability Tool (CPT). while to see the patterns of wind zonal and meridional wind using software The Grid Analysis and Display System (Grads) version 2.0. The result showed zonal wind relation to rainfall resulted in moderate correlation in March with a correlation coefficient (r = 0.45) whereas the meridional wind has a low correlation (r = 0.37). In November of zonal wind has a low correlation with a correlation coefficient (r = 0.36) compared to the meridional winds that showed a strong correlation (r = 0.60). So rainfall that occurred in West Sumatra is predominantly influenced by the zonal wind in March, while in November more influenced meridional wind. Meanwhile, wind patterns that affect rainfall in West Sumatra have equatorial wind pattern and the pattern of the monsoon
Analisis angin zonal dan outgoing longwave radiation (OLR) untuk inisialisasi kemunculan fenomena madden julian oscillation (MJO) di Kota Padang Delvita Handayani
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1035.041 KB) | DOI: 10.24036/2485171074

Abstract

Maden Jullian Oscillation (MJO) is the most dominant climate variations occur in the equatiorial region and was centered in the Indian ocean and the Pacific ocean which affects the climate change. This research was conducted to determine the pattern of zonal wind and Outgoing Longwave Radiation (OLR) by the time of MJO was active and to find the time when MJO was active using RMM1 and RMM2 index. Additionally, to knowing the characteristic of correlation between MJO signal and zonal wind in Padang. This research used secondary data in velocity of zonal wind form, height 850 mb,  reanalysis OLR data and index realtime multivariate (RMM1 and RMM2). Data are analyzed by using a program Weight Wavelet Z-transform (WWZ) and surfer 7 to see the patern and timing of the appearance MJO and characteristics of the connection MJO index RMM1 and RMM2 with 850mb zonal wind with simple regresion analysis and value of coeffisien determination (R2). The results showed that 850 mb zonal wind speed ranging from 5 m/s which suports to make formation of rain clouds and the carrier is evidenced by the low value of OLR as charactheristics of the MJO. The emergence of an active MJO phase 4, the impact caused by the emergence of the active phase of the MJO is a low wind speed and high rainfall during the propagation of the Indian ocean to the Pacific ocean that occured in the City of Padang. Time MJO emergence occured 19 time during 2010-2015. A highly significant connection between zonal wind and RMM1 and RMM2 850 with confidence interval 97%, and the effect on rainfall during the MJO is active in the City of Padang
Pembuatan alat ukur momen inersia benda digital menggunakan sensor optocoupler Nunung Rivia
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (975.006 KB) | DOI: 10.24036/2494171074

Abstract

The moment of inertia is the tendency of an object to remain stationary or move straight regular (maintaining position or situation). The moment of inertia of an object can be measured using a measuring instrument works on the moment of inertia oscillation method. The purpose of this study was to design a measuring tool moment of inertia of objects digitally using optocoupler sensor, as well as explaining the specification of performance, accuracy and precision of the system. Three are  results of this study. First, the performance specifications of the system consists of mechanical systems and is supported by an electronic system. Second, the measurement accuracy by comparing the calculation results with the system theoretically has an average error percentage 3,948% and 96,05% for the relative accuracy of the measurement of some moments of inertia of the object. Third, the precision measurements carried out by measuring the variation of the moment of inertia for 6 items and 10 repetitions with precision the average was 0,979 with a standard deviation of the average 0,000009152 and relative error average 0,834%
Penyelidikan struktur batuan menggunakan metoda geolistrik tahanan jenis konfigurasi wenner inversi robust constraint di Jorong Koto Baru Nagari Aie Dingin Kabupaten Solok Sri mulyani
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (433.37 KB) | DOI: 10.24036/2489171074

Abstract

Rock structure  in Jorong Koto Baru has not been known and analyzed. Furthermore, it is significant to conduct a research which was purposed to find the structure of rock in Jorong Koto Baru, Nagari Aie Dingin, Kabupaten Solok. The measurement used Resistivity Geoelectrical method with Wenner Configuration. The data were analyzed and interpreted by using Robust Constrain Inversion in software Res2dinv to obtain 2D model. This research indicated that there are five types of rocks which had formed  in Jorong Koto Baru, Nagari Aie Dingin, Kabupaten Solok. They are  Sands, Clay, Sandstone, Limestone, and Granite. Sandstone, Limestone and Clay dominate rock structure in Jorong Koto Baru
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1116.762 KB) | DOI: 10.24036/2484171074

Abstract

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
Analisis variasi spasial parameter seismotektonik daerah Sumatera Barat dan sekitarnya dengan menggunakan metoda likelihood Furqon Dawam Raharjo
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1389.511 KB) | DOI: 10.24036/2493171074

Abstract

West Sumatra is one area with high seismic activity, so that a potentially large and damaging earthquakes. In order to understand the occurrence of large earthquakes and damage need to know the local stress conditions and the level of seismic activity by analyzing seismotectonic parameters (a-value) and (b-value). Seismotectonic parameters low (a-value) and (b-value)  can be interpreted with a low level of seismic activity and the condition of local rock high stress, otherwise the high (a-value) and (b-value). This study by using a distribution relationship with the frequency-magnitude earthquake with likelihood method and then analyzed by using software ZMAP shaped graphic user interface (GUI) -based matlab. The data used in this study taken from the USGS and BMKG with the observation period 1960 - 2015, the parameters of earthquakes with shallow depths (h) <60 km and intermediate (h) 60-350 km with a magnitude of earthquakes (M> 4.0 SR). The results show the spatial variation seismotectonic parameters low (a-value) and (b-value) at shallow depths (h) <60 km observedat southern of Nias Island, along the west coast of northern Sumatra, active faults zone north Sumatra, around the Mentawai islands and parts of Sumatra active fault zone precisely in the area of Solok and South Solok. While at intermediate depths (h) 60-350 km observed at southeastern of Batu island and the west of Padang. Thus these areas a potentially large and damaging earthquakes

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