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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 15 Documents
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Search results for , issue "Vol 10 (2017)" : 15 Documents clear
Effect of ZrO2 addition on the NTC thermistor characteristics based on Fe2O3 from the mineral yarocyte Rosi Selfia Putri; Ratnawulan Ratnawulan; Dani Gustaman Syarif
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1154.52 KB) | DOI: 10.24036/2546171074

Abstract

Ceramic pellet has been made for the Negative Thermal Coefficient (NTC) thermistor from Fe2O3 base material of yarosite mineral. The powder of Fe2O3and ZrO2 is mixed and then crushed until homogeneous for ± 30 minutes. The mixture of the powder is pressed with 60 ton/cm2 to form a pellet on the 8 mm diameter mold. The pellets are sintered at a temperature of 1200oC for 3 hours in a furnace with atmospheric air. The pellet from the sintering process is coated with silver as an electrode. Next will be characterized using XRD (X-Ray Diffractometer), SEM (Scan Electron Microscope) and electrical characterization. Based on the results of XRD analysis it is known that the ceramics formed with the addition of ZrO2 0% doping, ZrO2 1% and ZrO2 3% have hexagonal hematite structure. Grain size based on SEM analysis, for each addition of 0% doping, ZrO2 1% and ZrO2 3% respectively is 10.81 μm; 11.51 μm and 10.24 μm. Results of measurement of electrical resistance, thermistor constant value is 3322 K, 3645 K and 5873 K. Conclusion in this study is the addition of ZrO2 does not affect the crystal structure formed based on the analysis using XRD. Addition of ZrO2 into Fe2O3 ceramic causes the grain size is relatively unchanged significantly. Based on the measurement of lstric resistance, the greater the ZrO2 addition concentration, the greater the resistance value at room temperature and the resulting thermistor constant
Fabrication of measuring tool for gear rotational speed using an inductive proximity sensor and an Arduino Uno microcontroller Elfi Susilawati; Yulkifli Yulkifli; Zulhendri Kamus
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (849.405 KB) | DOI: 10.24036/2536171074

Abstract

The development of science and technology (Science and Technology) always improved. Science and technology proven to provide convenience and benefits for humans as in the field of Physics, for example measurement of the Rotational speed. Rotational speed can be measured in two ways: manually and automatically. Automatic sensor-assisted system used to detect and monitor the speed of play. Sensors for this system is inductive proximity sensors npn LJ12A3-4-Z / BX type. The use of these sensors has not been widely used in general, so the design and realization of the system is done looking at technical data, specifications and sensor characteristics. The objective of the research is to know the performance specification and the design of the gear speed measuring instrument. This research is engineering research. Data collection is done directly and indirectly. Direct measurements are made by comparing the measurements and theoretical outcomes. Indirect measurements determine the precision and accuracy of the speed. The data obtained through measurement are statistically and graphically. Based on data analysis put forward two important sections. First, the measurement system performance specification using proximity sensor and arduino microcontroller UNO consist of DC motor there are 12 gear, near DC motor there is proximity sensor with 4 mm distance to gear, and box circuit. Design specifications of measuring instruments in the form of device sensitivity 8,015; Relative accuracy 0.97; 97% accuracy and 0.99 system accuracy
The estimation of maximum ground acceleration value in West Sumatra region based on the M 8.8 SR earthquake scenario using MC Guire (1963) and Donovan (1973) empirical formula. Mia Leviana; Syafriani Syafriani; Ardiyansyah Sabarani
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (565.511 KB) | DOI: 10.24036/2542171074

Abstract

West Sumatra is one of the regions is prone to earthquakes because it the positions of an active seductions zone between the Indo-Australian plate and the Eurasian Plate is along the Sumatra fault. The maximum ground acceleration is one of the important parameters, because it describes the strength of  earthquake vibration ever  happened. Therefore, it is necessary to do measurement and calculation of ground acceleration caused by earthquakes. By knowing the maximum ground acceleration values  in an area, we can  know  which area is prone to earthquakes. Data were analyzed by an earthquake scenario is created, and the epicenter 1.00o LS 99.00o BT, M = 8.8 magnitude and a depth of 30 km. Formulation of Mcguire (1963) and Donovan (1973) is used to find the value of the maximum ground acceleration and Murphy O'Brein empirical formula to find the value of intensity. The maximum ground acceleration value for each county / city in West Sumatra is calculated by using the position of the district / city as a reference point. The results of data processing maps obtained Peak Ground Acceleration (PGA) and the intensity of the earthquake. The analysis showed that the value of the PGA and the greatest intensity being Pariaman with a value PGA 177.59 gal and has a value of 7.67 MMI intensity. Then the value of the maximum ground acceleration both owned by the  Mentawai Islands with 176.72 gal and intensity value is 7.66 MMI.
Atmospheric stability analysis using Convective Available Potential Energy (CAPE) on the rain occurrence in Padang Yudha Nugraha; Asrul Asrul; Sugeng Nugroho
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (676.156 KB) | DOI: 10.24036/2547171074

Abstract

Precipitation is ones of many atmospheric phenomena which closed with human activity. There is so many factors in earth atmosphere that can cause precipitation from global into local scale. One of them is atmospheric stability that identified based on convective available potential energy (CAPE). Using of CAPE is to know the characteristics of atmospheric stability and its correlation with precipitation so we can estimate accuracy of CAPE for predicting daily rainfall. Study took location at several areas in Padang as a region which is located in  tropical latitude and divide it based on topographical characteristic such coastal, urban, and slope mountain area. To understand characteristic of atmospheric stability, is used scatterplot between CAPE with precipitation rainfall. Conclusion shows that for all studied area, CAPE value have variation from slight into moderate, with a little case heavy and extreme value. Correlation between CAPE and daily rainfall shows a negative correlation, which has r score less than -0.2. It can be assumed that relationship between CAPE and rainfall is not significantly closed. Hence, we can assume that atmospheric stability has a less relationship for making high intensity precipitation.
Fabrication of air tracks for kinematics and dynamics experiments based on ATMEGA328 microcontroller Even Triaga; Yulkifli Yulkifli; Yohandri Yohandri
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (861.352 KB) | DOI: 10.24036/2537171074

Abstract

Technological developments and the rapid advancement of science are caused by the increasing needs of human life. One of the disciplines that contributed considerably in the development of technology is physics. Important discoveries related to physics arise in the presence of physics experiments. The most important thing to consider in conducting a physics experiment is the set of experiments. The development of several sets of physics experiments with sensor-based digital systems has been developed, but not yet completely perfect, as in sets of kinematic experiments and dynamics. This study aims to determine the performance specifications and design specifications for the manufacture of Air Track For Kinematics and Atmega328 Microcontroller Based Instructions.This study included into laboratory experimental research. Data collection is done by measuring the quantities of physics contained in the magnitudes in kinematics experiments and dynamics. The measurement technique is a direct and indirect measurement. Direct measurements are made of the travel time of the object. Indirect measurements are made to determine speed, acceleration, and momentum. The data obtained through measurement and analyzed in two ways is statistically and graphically.Based on the results of data analysis can be disclosed some research results. First, this experimental set uses a promini microcontroller that works to process the output of the sensor and converts the sensor output to the desired output. The measurement result view of this experimental set uses the LCD. Sensor used is a photogate sensor that serves to measure the travel time of the object. Second, this experimental set has an average accuracy of 98.82% and an average accuracy of 92.13%. In addition, the phenomenon of perpendicular motion and straight-shifting motion can be well-regulated. Referring to the results of research that has been obtained stated that the developed air track can be used for kinematics experiments and dynamics

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