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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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PENDAHULUAN JURNAL Cover Dewan Redaksi Daftar Isi
PILLAR OF PHYSICS Vol 3 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

CoverDewan RedaksiDaftar Isi

Studi instrumen gas analyzer inlet KILN 5W1A50A1 untuk pengukuran kadar oksigen di KILN pada PT. Semen Padang (Study of the KILN 5W1A50A1 inlet gas analyzer instrument for measuring oxygen levels at KILN at PT. Semen Padang ) Nila Yulita; - Asrizal; Zulhendri Kamus
PILLAR OF PHYSICS Vol 11, No 2 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Oxygen has an important role in the process of burning cement and producing Carbon Monoxide. The oxygen content can be measured using a Gas Analyzer. At PT. Semen Padang has a Gas Analyzer but information about instruments, data and analysis and the use and constraints of the Gas Analyzer are still lacking. To answer this promblem researchers are interested in conducting further research. This research includes descriptive research, namely research that aims to describe or explain an object's variables. measurement results obtained from the measurement results using a Gas Analyzer. the measurement results obtained will be analyzed statistically and graphically. the measurement results are analyzed by data in one day, one week, one month and for 6 months. Based on the results of data analysis it can be seen that the oxygen gas content of the measurement results is still in the range used.

Analysis of daily rainfall to determine the pattern of madden julian oscillation (MJO) phenomenon in the areas around the Indonesian equators Afni Nelvi
PILLAR OF PHYSICS Vol 4 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Madden Julian Oscillation (MJO) plays an important role as the Intraseasonal Variaton (ISV) that can affect the amount of rainfall. Knowing phenomena of oscillation as the MJO provides benefits to determine the approximate rainfall in the foreseeable future. Therefore, the authors are interested in researching on daily rainfall analysis to determine the pattern of the phenomenon of MJO in the area around the Equator Indonesia including Padang, Pekanbaru, Pontianak and Palu in 2003-2012. This research is descriptive research. This research data is a daily rainfall data for areas of Padang, Pekanbaru, Pontianak and Palu of the years 2003-2012. The data processing is done using Microsoft Excel, Weighted Wavelet Z-Transform (WWZ) and surfer 8. Based on the results of data processing, Padang and Pontianak having a pattern of rainfall equatorial, Pekanbaru having a pattern of rainfall monsunal while Palu having the pattern of rainfall pattern local. A pattern of oscillations MJO in the field and Pekanbaru active in phase 3, in Pontianak active in phase 4 and in the Palu active in phase 5. Impacts generated oscillations MJO in phase active is rainfall will high in the area which behind him during propagation of the Indian Ocean to the Pacific Ocean. The accident time MJO in Padang are more dominant than to the areas of Pekanbaru, Pontianak and a Palu, with 36 times. MJO in Pekanbaru happens as many as 15 times, in Pontianak happens as many as 26 times and in the Palu happens as many as 16 times

Pengaruh komposisi terhadap ukuran butir lapisan nanokomposit CoFe2O4/PVDF dengan metode spin coating (The influence of composition to the grain size of the CoFe2O4 / PVDF nanocomposite layer by using the spin coating method) Diana Putri; Yenni Darvina; - Ramli; - Yulkifli
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The study of nanocomposites have been done much by researchers. Nanocomposites is a mixture of nanoparticle powder consisting of two materials called matrix and filler. The filler used in this study is CoFe2O4 and the matrix is PVDF. This study advantageous for investigating the micro structure of CoFe2O4/PVDF nanocomposite layer. The micro structure to be is the size of crystals, the micro strains, the size of grains and the thickness of nanocomposite layers. It is a research experiment that uses variations in composition 10 ml : 10 ml, 10 ml : 20 ml, 10 ml : 30 ml. The characterization tools used were X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM). XRD is used to get the corner of two theta and a half peak width (FWHM) from a layer of nanocomposite. SEM characterization gets to morphology of the surface and the thickness of nanocomposite layers. The thickness of a nanocomposite layer obtained is that 25.11 m, 29.81 m, and 35.51 m. Based of research already done, the more thickness of a nanocomposite layers the size of crystals and micro strains has also increased.

Pengaruh waktu milling terhadap ukuran butir quartz dari Nagari Saruaso Kabupaten Tanah Datar Yuni Zahara
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Indonesia is a country with abundant natural resources, one of which is the mineral silica material. Silica can have a high value in the world steel industry by changing the quality of the nanomaterial. The method can be implemented in the manufacture of nanomaterial one of which is the High Energy Milling 3D Motion. The purpose of this study was to investigate the influence of milling time on the nanostructure in the form of quartz crystal structure, crystal size, grain size, and morphology. The results showed that for the time milling 6, 12, 24 hours and 30 hours obtained the crystal structure of Hexagonal. Effect of milling time to 6 hours, 12 hours, 24 hours and 30 hours in getting the sample size quartz crystal at around 164 nm, 123 nm, 79 nm, and 68 nm. The grain size in a row is equal to 464 nm, 380 nm, 345 nm, and 293 nm. Morphology homogenous evenly across the surface

Pengaruh kerapatan terhadap koefisien absorbsi bunyi papan partikel serat daun nenas (Ananas comosus L Merr) (Effect of density on sound absorption coefficient of pineapple leaf fiber particle board (Ananas comosus L Merr)) Wahyudil Hayat; - Syakbaniah; Yenni Darvina
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACTThe main objective of this study was to determine the effect of density on board sound absorption coefficient of the particle board pineapple leaf fiber which will be applied as a silencer. Preparation of the sample begins with the separation of basic ingredients, followed by the manufacture of rectangular samples with a size of 9 × 9 × 0.5 cm using a machine felts, then the acoustic characteristics of the specimens were tested using a resonance tube. From the research that has been done can be concluded that at low density the greater the density of the sound absorption coefficient of the particle board pineapple leaf fiber, the greater the coefficient absorbsinya. At high density, the sound absorption coefficient down.Keywords: absorption coefficient, pineapple fiber, acoustic material.

PENGARUH WAKTU PERENDAMAN BAJA DENGAN EKSTRAK BUAH PINANG DAN HCl TERHADAP LAJU KOROSI DAN POTENSIAL LOGAM Mega Wahyuni
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Corrosion can not be prevented but rates can be reduced. One of the most effective ways to reduce the rate of corrosion is the use of organic inhibitors. The purpose of this study was to of this study was to obtain a corrosion inhibitor inexpensive and non-toxic. This research is experimental research with a sample of ASSAB 760 leading edge of materials that are medium carbon steel. immersioning steel with inhibitor in two ways, namely steel immersion areca extracts for 24 hours, then immersion with HCl (with inhibitor method I). Steel immersion with HCl + areca nut extract (with inhibitor method II). The independent variable is the variation of immersion time. The dependent variable such as the rate of corrosion inhibitor efficiency, potential. Control variables such as the type of steel used, the concentration of HCl, inhibitor concentration and temperature. By using this method of weight loss obtained corrosion rate and inhibitor efficiency. Potential metal obtained by direct measurement. From the results obtained with inhibitors steel immersion in acidic environments means I have a higher efficiency than soaking the inhibitor method II. From the overall results of the study showed that areca nut extract is an effective corrosion inhibitor for steel in acidic environment, because it can inhibit the corrosion rate with an efficiency of 61.31% - 74.56% by immersioning 12 hours, 24 hours and 36 hours. Keywords: medium carbon steel, areca nut extract, organic Inhibitor, weight loss method, immersion time.

Studi instrumen ceilometer allweather 8339 dan data hasil pengukuran di Stasiun Meteorologi Minangkabau Padang (Study of the allweather 8339 ceilometer instrument and measurement data at the Minangkabau Meteorological Station, Padang ) Serly Samarantika; - Asrizal; Zulhendri Kamus
PILLAR OF PHYSICS Vol 11, No 1 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The cloud height measurement has important role in aviation field. One of instruments that is used to measure the cloud height is ceilometer. The existence of ceilometer isn’t so common in daily life unlike other weather elements measuring device such as thermometer, barometer and so on. This cause lack of learning source and knowledge over the cloud parameters for students or observers. For this reason, the research about ceilometer instrument is important. The aim of this research is to describe the operation principle of ceilometer and to determine the data results interpretation of the instrument to give support for instrument’s future development. This research can be classified into the descriptive research category. The object of the research is Ceilometer Allweather 8339 in Minangkabau International Airport and its data results during 14 days. The data was analyzed using analysis descriptive technique. This was executed by collecting any kinds of information from field and literatures. Based on the data analysis can be stated two of research results. First, ceilometer works based on Lidar Principle and using NWS ASOS Sky Condition Algorithm as programming algorithm. The transmitter is InGaAs Laser diode and Avalanche Photo Diode is used as receiver. Second, the measurement result data from 1st July 2017 until 14 July 2017 shows variative pattern in height, sky condition and amount of layers every hours. For example the date that consist of the most low clouds is 7th July 2017 and cloud rarely formed on 3rd July 2017

Pengaruh suhu proses dan lama pengendapan terhadap kualitas biodiesel dari minyak jelantah (The influence of process temperature and deposition time on biodiesel quality of cooking oil) Silvira Wahyuni; - Ramli; - Mahrizal
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Biodiesel is a type of fuel alternative diesel derived from biological materials that are processed vegetable oil transesterification using methanol and catalyst NaOH. One of the vegetable oil is used cooking oil. Used cooking oil is one of the raw materials that have a high chance for the manufacture of biodiesel because it still contains triglycerides in addition to free fatty acids. Biodiesel is made by giving some physical treatment, such as temperature and duration of settling time. To investigate the influence of temperature processes and duration settling time conducted this research with a variety of 40°C, 50°C, 60°C, 70°C, and 80°C and duration settling time , for 48 hours, 96 hours, 144 hours, 192 hours and 240 hours as independent variables, Controlled variable is the time stirring for 5 minutes, stirring speed of 1050 rpm, the catalyst base (NaOH), a methoxide liquid is 20%. Dependent Variable is biodiesel quality which covers viscosity, density, yield, and Flash Point. It was found if the temperature is greater, the viscosity and density decreases. While the highest yield is 76% produced by variations in temperature of 50°C, the average Flash point >110°C, the results of biodiesel according to the SNI Standards. For a settling time variety is not a significant influence in the making of biodiesel with the average for all variations in viscosity between 5.7-5.8 CSt, density of about 861 kg/m3, flash point >110°C and average yield is 75.8%

Pengaruh variasi komposisi MnFe2O4 terhadap sifat magnetik nanokomposit MnFe2O4/PANi yang disintesis dengan metoda sol – gel spin coating (MnFe2O4 composition influence on the magnetic properties of MnFe2O4 / PANi nanocomposites synthesized by the sol-gel spin coating method) Zhafrandy Eka Senida; - Ramli; - Ratnawulan; - Hidayati
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Currently theeprogressoof material nanocomposite can be applied for some of electronic device, bio medic, and electronic engineering. This is because nanocomposite has multifunction of magnetic properties. Most of device use nanoparticles was made from ferrite material, such as MnFe2O4 with high electrical performance, high magnetic permeability. And as matrix used PANi with good thermal stability and high conductivity. With this advantages, synthesis both material can be applied for electronic device like magnetic sensor. Synthesis MnFe2O4/PANi nanocomposite material with 30%, 40%, 50%, 60%, and 70% composition variation of MnFe2O4 with Sol-Gel method has been success. MnFe2O4/PANi nanocomposite was prepared by make of Fe2O3 precursor, make MnFe2O4 and PANi solution with sol-gel method, make MnFe2O4/PANi nanocomposite with spin coating, heating, and sintering the nanocomposite. This nanocomposite characterized with XRD, FTIR, and VSM. Magnetic properties nanocomposite were measured withaa Vibrating Sample Magnetometer (VSM). Result of VSM shows value of coercivity (Hc), remanence magnetization (Mr) and saturation magnetization (Ms). Highest value offcoercivity shows in 60% composition variation with score 389,99Oe, from the value of coercivity, we can classified this nanocomposite as a hard magnet. And for the value of saturation magnetization is 1,07 memu and remanence magnetization is 0,35 memu. The applied field of nanocomposite shows in loop hysteresis with range -10000≤ H ≤10000, it show the ferromagnetic behavior. Ferromagnetic is one of material properties which needed for magnetic sensor. So can be concluded that MnFe2O4/PANi nanocomposite can be applied for magnetic sensor.

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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