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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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Analysis of weather elements based on measurement results of Automated Weather System (AWS) type Vaisala MAWS 201 Muhammad Ihsan Qudratullah; Asrizal Asrizal; Zulhendri Kamus
PILLAR OF PHYSICS Vol 9 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Human activities due influenced by natural conditions and natural conditions are affected by human activities. This phenomenon is interesting because everybody couldn't control over the weather. Accuracy weather information can minimize the negative effects of weather such as aircraft accidents, material losses due to flooding and other. AWS is instrument used to measure the weather elements. However, in practice most of the weather forecast is only used to help smooth plane flight, and the result can only be accessed by certain institutions. In fact, if viewed more deeply the weather forecast has many benefits in human activities. This research objective is to determine the characteristics of the weather elements that can be utilized for various fields of human life. This research was descriptive which describe the AWS Vaisla MAWS 201 and the elements of the weather based on measurements using Vaisala MAWS 201. AWS measurement data retrieval was done directly by observing changes in weather elements occurring on the computer display. The computer display of measurement data elements of weather can be downloaded to be processed as information material. From these research activities could be offered two results. First AWS consist of remote terminal Unite (RTU), personal computer (CP), Sensors. AWS can measure some weather elements at once. Second, the measurement data obtained from the results that the average temperature in 2013 and 2014 was 250C -300C and minimum temperature of 240C. For the measurement of rainfall average per year is 35 mm and 0 mm. The air pressure value of the average per year is 1012 mb and 1009 mb. Air humidity is 80 and 82. Wind speed is taken from an annual average value of 10 m / s in 2014 and 3 m / s in 2013

ANALISIS DATA PARAMETER HUJAN MENGUNAKAN FITUR GUIDE PADA MATLAB BERDASARKAN HASIL PENGUKURAN INSTRUMEN OPTICAL RAIN GAUGE DI LOKA PENGAMATAN ATMOSFER KOTOTABANG LAPAN Soni Darma Laserio
PILLAR OF PHYSICS Vol 3 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Optical Rain Gauge (ORG) is an instrument rainfall monitoring. Rainfall data analysis from ORG is use to determine the type of Oldeman climate classification. Rainfall data conditioning uses matlab then comparing the type and sub type climate of Oldeman. ORG has been installed in Kototabang (0.20S; 100.320 E). The research have three Resuls. First,ORG Receiver box measure rainfall by detecting osillation of light when the IRED output blocked by water droplets. Secondly, the user interface of rainfall data conditioning were made by Matlab GUIDE the features of Matlab. Third, the results of rainfall data analysis from 2010 and 2011 ORG-815 output data is the Oldeman climate types for Kototabang area. Oldeman climate type for 2010 data is D1 type and the year 2011 is C2 type. Keywords: Rain, Parameter, Guide Fitur, Instrument, ORG

Analisis struktur batuan berdasarkan data geolistrik tahanan jenis konfigurasi schlumberger dan konfigurasi dipole-dipole di Kecamatan Malalak Kabupaten Agam (Analysis of rock structures based on geoelectric resistance of schlumberger configuration and dipole-dipole configuration in Malalak District, Agam Regency ) Winda Permatai Sari; - Akmam; - Hidayati
PILLAR OF PHYSICS Vol 11, No 2 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The bedrock can interpreted using the Geolectrical method. The aim of this research was determine the resistivity and structure of bedrock in Malalak District Agam area. This research used Dipole-dipole configuration and Schlumbergerconfiguration. Both of that configuration have complementary advantages and disadvantages to each other. The data were processed and interpreted with using Smoothness-Constraint Least Square inversion. The result of this research showed that type structure of bdrock in malalak Disctrict Agam area with Dipole-dipole configuration and Schlumberger configuration. The type structure of bedrock on this research is Clay, Sandstone, Limestone, Andesite andGranitee.

Prototype of temperature and time rushing control system of soybeans boiling process for tofu manufacture based on AT89S52 microcontroller using IC LM35 Afdi Marta
PILLAR OF PHYSICS Vol 4 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The objective of these research are to determine the transfering function and sensitivity of the sensor IC LM35, to describe the physical shape and dimensions of the system controlling the temperature and time in the process of boiling porridge of soy, and to determine the static of characteristics of temperature control system based on microcontroller AT89S8252 with LM 35 sensors for boiling the soy porridge process. This research can be classified into engineering research. Data collection techniques are both direct and indirect measurement. Direct measurement ise used to measurement the temperature of soy porridge process. On other hand, indirect measurement is used to determine the accuracy and precision of the system in the manufacture of soy porridge boiling out. Based on the analysis of the data can be presented three results of research. First, the voltage output temperature sensor IC LM 35 is directly proportional to temperature. Second, description and temperature control system that describe each part of the system. Finally, instrument temperature control has a very high accuracy and precision of 96.96% on average.Keywords: Prototipe, Controlling System, Temperature, Time, Soy boiling , IC LM35

Pengaruh variasi ukuran partikel terhadap nilai konduktivitas termal papan partikel tongkol jagung Nanda Pratama
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Corncobs by most people still not optimally utilized, even considered as a waste byproduct of the primary production of maize. The content of lignocellulosic on corn cob allows for the manufacture of particle board by testing the thermal conductivity of which is expected later can be used as a heat insulator. The process of manufacture of particle board made with compression heat for 20 minutes with pressure of 160 Pa and temperature of 150 ° C, drying particle board for 15 days, density particle board 0.6x103 kg / m3 and thickness of particle board 1 cm.The results obtained for the thermal conductivity value of corncob particle board is greater mesh size, the smaller the size of its particles, the greater the thermal conductivity. From the results concluded that good particle board to serve as heat insulator materials are those that have low thermal conductivity values which qualify ukaran 8 mesh sieve amounted to 0.1012 W / m ° C. Increasingly smaller particle size makes thermal conductivity value increases so that the quality of heat insulator decreases

Pengaruh variasi suhu annealing terhadap struktur dan ukuran butir silika dari abu tongkol jagung menggunakan X-Ray Diffractometer (The effect of annealing temperature variations on the structure and grain size of silica from corn cobs ash using X-Ray Diffractometer) Yoza Monalisa; Djusmaini Djamas; - Ratnawulan
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACTThe development of technology and the use of silica in the industry is increasing, especially in the use of silica in the small particle size to the scale of microns or even nanosilika. The increasing need for silica it is necessary to find alternative materials that can be updated to produce silica. One is corn that has not been optimized. This research aims to investigate the structure and grain size of corn cob ash. This research is a form of experimentation with free variable 10000C annealing temperature and 11000C with a time of 6 hours of detention, control variables such as the mass of corn cobs, chemicals, and filter paper used. The dependent variable measures the levels of silica and silica crystals. Ash obtained was analyzed by gravimetric methods. Later in the annealing temperature of 10000C and 11000C for 1 hour will be obtained silica powder. Silica powder obtained by XRD to determine the crystal structure and the determination of the crystal grain size using Equation Schherer. After data collection and analysis of data obtained from crystalline silica structure is a diamond cubic structure with lattice parameter (a) is 7.01 Å. Grain size of the smallest crystals obtained at 11000C annealing temperature is 11.38 nm and the size of the crystal grain size of the greatest at 10000C annealing temperature is 40.83 nm. Keywords: grain structure, grain size, diffraction

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

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

Pengaruh Logam Berat Terhadap Sifat Fisis Pemancaran Cahaya dari Bioluminisensi Kunang-kunang (Pteroptyx tener) Melly Sarvida
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Heavy metal is environmental factor which influences the relative intensity of firefly light. Heavy metal in firefly body is estimated to be able to decrease the intensity of light produced. This research will discuss the influence of heavy metal toward bioluminescence reaction of firefly. It starts from the influence of heavy metal type and concentration toward intensity, inhibition coefficient and the influence of molecule weight with bioluminescence inhibition coefficient of firefly. This research is an experimental research conducted in Material Physics and Biophysics Laboratory and Chemistry Laboratory of FMIPA UNP. In this research, the measurements of wave length and light intensity are conducted toward firefly of Pteroptyx tener taken from Sungai Lareh , a district of Koto Tangah, Padang before and after being given treatment with heavy metal by using UV-Vis spectrophotometer. The Determined variables in this research is independent variables which consist of lead (Pb), copper (Cu), iron (Fe) and zinc (Zn) and heavy metal concentration is 0,5 mg/l, 1 mg/l and 2 mg/l, the dependent variables are relative intensity of firefly light and inhibition coefficient, and the control variable is type and size of firefly and solvent media used. The result of research indicates that bioluminescence relative intensity value of firefly keep declining if heavy metal concentration rises up. The decline of the biggest intensity is caused by the existence of lead (Pb), then zinc (Zn), copper (Cu), and the smallest is iron (Fe). Bioluminescence inhibition coefficient of firefly keeps declining because of the increasing of heavy metal concentration. For concentration of 0.5 mg/l , the coefficient inhibition of lead (Pb) is 1.8620M-1, zinc (Zn) is 0.6275M-1, copper (Cu) is 0.4260M-1, and the smallest is iron (Fe) which is 0.2481M-1. For concentration of 1 mg/l, the inhibition coefficient of lead (Pb) is 1.1494M-1, zinc (Zn) is 0.4269M-1, copper (Cu) is 0.3385M-1 and the smallest one is iron (Fe) which is 0.2747M-1. For concentration of 2 mg/l , the inhibition coefficient of lead (Pb) is 0.8951M-1, zinc (Zn) is 0.3269M-1, copper (Cu) is 0.2998M-1, and the smallest one is iron (Fe) which is 0.2671M-1. The biggest inhibition coefficient from bioluminescence of firefly is caused by the existence of lead (Pb), then zinc (Zn), copper (Cu), and the smallest one is iron (Fe). The biggest Inhibition coefficient value is followed by the large of heavy metal molecule weight, that is nitrate lead (PbNO3) that has the biggest molecule weight which is 269.20 g/mol, then nitrate zinc (ZnNO3) which is 127.38 g/mol, nitrate copper (CuNO3) which is 125.55 g/mol and nitrate iron (FeNO3) which is 117.86 g/mol. Keywords: Bioluminescence, Heavy Metal, Relative Intensity and Inhibition Coefficient

Analisa komparatif percepatan tanah maksimum akibat gempabumi M6.3 di Selat Mentawai berdasarkan rumusan empiris Ground Motion Prediction Equation (GMPE) (Comparative analysis of the maximum ground acceleration due to the M6.3 earthquake in the Mentawai Strait based on the empirical formula of Ground Motion Prediction Equation (GMPE) ) Fitri Anggriani; - Akmam; - Syafriani
PILLAR OF PHYSICS Vol 11, No 1 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The ground motion intensity caused by an M 6.3 earthquake that struck Mentawai Strait on September 1st, 2017 with epicenter -1.24 N and 99.75 E and depth 58 km were recorded on BMKG’s seismic and intensity network, the intensity was about III - IV intensity scale (MMI) and the acceleration was 2.8 g. The earthquake intensity calculation in Indonesia can also be calculate by using Ground Motion Prediction Equation (GMPE) such as Si and Midorikawa (1999), Mc Guire (1963), Donovan (1973) and Wu et al (2003) empirical equations. We conducted a research to compare the peak ground acceleration calculation between using empirical equation and by using data observed on BMKG’s intensity networks. The PGA result on every district of Sumatera Barat Province that shown on BMKG’s shakemap has a significant different comparing with the calculation using the equations. The PGA values by using the empirial equations were decayed through the hipocenter distance of the earthquake in every district of Sumatera Barat Province. Meanwhile base on the observed one, we found some anomalies of PGA value on some BMKG’s accelerograph station networks i.e. PDSI in Padang and PAPA in Padang Panjang with 14.35 g and 5.07 g respectively. But these anomalies were not impacted to the result of the intensity, because they have some filters that can elimunate these kind of anomalies to conduct an accurate result.

Investigasi bidang gelincir di Jorong Koto Baru Nagari Aie Dingin Kabupaten Solok dengan metode geolistrik tahanan jenis konfigurasi schlumberger (Investigation of landsile slip surface in Jorong Koto Baru Nagari Aia Dingin, Solok Regency using the geoelectric resistivity method with the schlumberger configuration) - Nurhidayati; - Akmam; Harman Amir
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Investigation of landslide slip surface using geoelectrical resistivity method has been conducted at Jorong Koto Baru Nagari Aie Dingin Kabupaten Solok. The aim of this research is to know the shape of slip surface, depth of slip surface, and angle of slip surface. Data were collected by Automatic Resistivity Multielectrode in 4 lines with Schlumberger configuration. Interpretation of data was done with Robust Constraint Inversion. The result of this research shows that slip surface is Translation slip. The estimation result showed that the subsurface lithology on four path consist of Alluvium and Sands, Sandstone, Clay, Limestone and Granite. The slip surface is a clay layer on four path with resistivity value range from 66.1-90.25 Ωm, 70.45–90.8 Ωm and 67.05-100 Ωm. Depth of slip surface for one and three section was found are of 7.05 meter, and for two section was found are of 4.14 meters. Angles of slip surface are 21.74°, 19.94°, 21.85°, 17.46° and 17.13°

Page 15 of 30 | Total Record : 297

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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