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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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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

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

PENGARUH VARIASI KOMPOSISI AMPAS TEBU DAN SERBUK GERGAJI PADA PAPAN PARTIKEL TERHADAP KONDUKTIVITAS TERMAL Fitri Maiwita
PILLAR OF PHYSICS Vol 3 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Lack of utilization of bagasse and sawdust has been a big problem for the sugar and the wood industry in Indonesia. Bagasse and sawdust is used as fuel only and the rest is thrown away. The content of the bagasse lignocellulosic allows to be used as particle board. Particle board with variations in the composition of bagasse and sawdust had been investigated previously by testing his physical and mechanical properties. However, the thermal conductivity testing has not been done. Therefore, researchers would like to continue this research by testing the thermal conductivity of the particle board with thermal conductivity apparatus,, because it contains silica bagasse. Silica is a ceramic material that is an insulator so it is hoped will be used as a heat isolator. Created by varying the particle board bagasse and sawdust that is 100 % : 0 % , 75 % : 25 % , 50 % : 50 % . The process of manufacture of particle board made with compression heat for 20 minutes with pressure of 160 kg/m2 and temperature of 180 ° C. Based on the results obtained by the value of the thermal conductivity of particle board with a composition ratio of bagasse and sawdust 100 %: 0 is equal to 0.08 W / m ° C, 75 % : 25 % ie 0.11 W / m ° C , and 50 % : 50 % ie 0.14 W / m ° C. The smaller the bagasse composition, the greater is thermal conductivity. From the results obtained, it can be concluded that the particle board as an heat isolator has the lowest thermal conductivity, that is 0.08 W / m ° C with 100 % bagasse composition. Giving sawdust makes thermal conductivity value increases so that the quality of heat isolator decreases. Keywords: Bagasse , Sawdust , Thermal Conductivity , Particle Board

Studi awal rancangan alat colorimeter menggunakan sensor OPT101 untuk menentukan serapan ekstrak pewarna alami berbasis mikrokontroler arduino (Preliminary study of the colorimeter design using OPT101 sensor to determine the absorption of natural dye extracts based on the Arduino microcontroller) Puja Kahar; - Yulkifli; - Ramli
PILLAR OF PHYSICS Vol 12, No 1 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Colorimeter is a color measuring instrument used to measure the amount of output voltage produced by each different dye. The dyes used here are red and orange color dyes as the beginning of the experiment. The samples used can be used in hazardous and harmless coloring materials, but in this experiment using non-hazardous artificial materials. The results of the trial output are displayed on the LCD. This tool uses LED as a source of light emitted in samples that are red and orange, then captured by the OPT101 Sensor which converts light into an output voltage. The output voltage is amplified by a voltage amplifier circuit. The results of the output voltage are confirmed on the arduino which is then displayed on the LCD. The program from Arduino is programmed using Arduino software which is then compiled or sent to Arduino which is then displayed on the LCD. The results of the colormetical device were made on a 2.4 volt red sample and an orange sample of 3.13 volts. So that from the measurement results we can distinguish colors from the sample used

Effect of calcination on serpentin crystal structure gathered form Jorong Sungai Padi, Nagari Lubuak Gadang Kecamatan Sangir, Solok Selatan Vivi Febrini
PILLAR OF PHYSICS Vol 4 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Serpentine rock alteration of olivine is widespread with content that is rich in magnesium oxide and silica. It has done research on the serpentine from Jorong Sungai Padi by giving heat treatment for investigating the crystal structure of serpentine. The samples of serpentine were crushed and sieved till form powder and calcined at temperature 725 ℃ to 825 ℃ for 1 hour. The results calcination were characterized by X-Ray Diffraction (XRD). The results calcination showed that the serpentine occurred alteration of structure, such as from monoclinic structure became orthorombic structure. That’s mean showed, in serpentine had a new minera

Pengaruh komposisi MnFe2O4 terhadap sifat magnetik nanokomposit MnFe2O4 / PVDF yang di preparasi dengan metode spin coating (The effect of the MnFe2O4 composition on the magnetic properties of the MnFe2O4 / PVDF nanocomposites prepared by the spin coating method) Romizah Marta; Yenni Darvina; - Ramli; - Desnita
PILLAR OF PHYSICS Vol 13, No 1 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Now is the age of the "Internet of things", where physical devices are able to exchange information between information sources connected to the system. To build a system, it takes a components device which in the manufacturing process is made into Nanocomposites. In this research, the materials used as Nanocomposites are Manganese ferrite (MnFe2O4) and Polyvinilidene Flouride (PVDF). Then the method used is the Spin Coating. The Spin Coating Method is used to grow a thin layer of MnFe2O4 / PVDF Nanocomposites. In the process of making Nanocomposites, Manganese and Iron are used as precursors. In this research, researcher used five variations of the composition of MnFe2O4 / PVDF Nanocomposites, namely 25% : 75%, 33.33%: 66.67%, 50% : 50%, 66.67%: 33.33% and 75%: 25%. There are three characterization tools used in this research namely XRD, FTIR and VSM. The results of XRD characterization as supporting data in this research show each peak has a different angle of 2Ө, intensity, FWHM value and Miller Index. Crystal form of PVDF is Monoclinic and Crystal form of MnFe2O4 is Cubic. The results of FTIR characterization as supporting data found two functional groups, namely Fe-O and CH2. For Fe-O is the MnFe2O4 Function Group, and CH2 is the PVDF Function Group or (C2H2F2)n. The results of the characterization of VSM as the results of the study show the relationship between the variation of the composition of the MnFe2O4 / PVDF Nanocomposites with Saturation Magnetization which tends to decrease which is worth 2.07 at 25% : 75% composition, 1.11 at 33.33% : 66.67% composition, 1 at 50% : 50% composition, 1.54 at 66.67% : 33.33% composition and 1.09 at 75%: 25% composition. The same result also occurs in the relationship of composition variation with Remanent Magnetization, which is worth 0.37 at 25% : 75% composition, 0.35 at 33.33% : 66.67%, 0.47 at 50% : 50% composition, 0.31 at 66.67% : 33.33% composition, 0.25 at 75% : 25% composition. Furthermore, the results of the relationship of variations in the composition of MnFe2O4 / PVDF nanocomposite with Coercivity is high low Coercivity values. This shows the change in nature from Hard Magnetic to Soft Magnetic. The value of Coercivity is 297.08 at 25% : 75% composition, 144.96 at 33.33%: 66.67% composition, 274.05 at 50% : 50% composition, 300.53 at 66.67% : 33.33% composition and 196.57 at 75% : 25% composition.

Pengaruh penambahan senyawa ekstrak kulit jeruk (Citrus sp.) terhadap sifat fisika plastik biodegradable dari ubi kayu dengan senyawa aditif gula jagung Dona Intan Rezki
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The materials used today to package food and drink one of which is plastic. Over time, the plastic needs increasing in many areas of life. On the other hand, the use of plastics as packaging materials face many environmental problems, which can not be decomposed by microbes in the soil. This resulted in the accumulation of plastic waste that cause air pollution, environmental damage and also have a negative effect on human life. Because of these problems, need to be overcome to make plastics that are environmentally friendly and do not cause pollution, the biodegradable plastic. Biodegradable plastics in this study with the addition of orange peel extract compounds of 0%, 10%, 15%, and 20%. Tests were performed to obtain the value of the mechanical properties and degradation of plastics biodegrdable cassava with variation of orange peel extract compounds are as follows: increased tensile strength values for the addition of orange extract compounds from 10% -15 and decreases in increments of 20%, as well as the flexural strength . While the ability of degradation increases with increasing amount of orange peel extract compounds

Cover, Dewan Redaksi, Daftar Isi Pendahuluan Jurnal
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Cover, Dewan Redaksi, Daftar Isi

KARAKTERISTIK FISIS PEMANCARAN CAHAYA KUNANG - KUNANG TERBANG (Pteroptyx Tener) Melfita Sari
PILLAR OF PHYSICS Vol 3 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

In the city of Padang area Sungai Lareh discovered species of fireflies Pteroptyx tener. At the fireflies information about the physical characteristics of the light transmitting species is unknown. This information is essential for many applications especially in the field of bioluminisensi. Therefore carried out research with the aim of assessing the physical characteristics of the light transmitting fireflies, covering the wavelength of light emitted at maximum intensity, the decay constant, the value of the quantum yield, the number of photons emitted per second and the activation energy. This kind of research is ex post facto reveal the physical characteristics of transmitting light of fireflies and no treatment on the object under study. To obtain the data in this study using a measuring instrument that is light emission intensity: UV-VIS spectrophotometer. Fireflies used are taken from the Sungai Lareh koto Tangah Padang. The result is the value of the wavelength of maximum relative intensity is 540 nm. This value is at the wavelength of visible light with a greenish yellow color. These results are consistent with the observation that the color of light emitted by fireflies the yellow-green color. Konsatanta decay resulting from fireflies obtained at 0.0046 quanta per second, and the number of photons emitted per second by fireflies (Pteroptyx tenner) is equal to 9.93209 x 1011 quanta/second. the value of these photons can be obtained quantum yield is 0.56819. Keywords: Bioluminisensi, the fireflies, the wavelength at maximum intensity, quantum yield and activation energy.

Pengaruh fraksi konsentrasi nanokomposit Fe3O4/PANi dengan metode sol-gel spin coating untuk material elektroda baterai lithium (Effect of Fe3O4 / PANi nanocomposite concentration fraction by sol-gel spin coating method for lithium battery electrode material ) Varadila Sahanaya; - Ramli; Yenni Darvina
PILLAR OF PHYSICS Vol 11, No 2 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

In this modern era, technological developments in the field of electronic devices are progressing very rapidly. Therefore, this triggers the demand for storage of electrical energy, one of which is a lithium battery. The performance of the lithium battery depends on the electrode material used. The purpose of this study was to investigate the effect of Fe3O4 concentration on Fe3O4/PANi nanocomposite electrical properties by sol gel method for lithium battery electrode material. In this study, the growth of Fe3O4/PANi nanocomposite layers using spin coating method with a concentration variation of 30%, 40%, 50%, 60% and 70%. Magnetite was prepared using sol-gel technique with precursors (Fe(NO3)3.9H2O). Then the precursor was mixed with PANi polymer with varied concentrations. The results of Fe3O4/PANi Gel are coated on a glass substrate followed by a drying process. Fe3O4/PANi nanocomposite layers were characterized using X-Ray Diffraction and Scanning Electron Microscopy and LCR meters. The results of this study indicate that at a concentration of 30% to a concentration of 40% there is a decrease but at a concentration of 50% an increase in the size of the crystal and at a concentration of 60% to 70% decreased again. FTIR results show the molecular bond formed and the results of SEM imaging show the thickness of the nanocomposite layer. As well as conductivity and electrical capacitance obtained through characterization using LCR meters which are 6.91218303 S/cm and 2.69 x10-10F.

Effect of temperature on dunit structure in Jorong Tongar, Nagari Aur Kuning, Kecamatan Pasaman, Kabupaten Pasaman Barat West Sumatra Melinda Wardani
PILLAR OF PHYSICS Vol 4 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

This research was conducted to find out the structureof the mineral dunite before and after calcination. This important research is done to increase the utilization of dunite. Determination of the structure of the dunite use characterization x-ray Diffraction (XRD). Dunite is heated with temperature variation, to see its effect when given the variations in temperature. The results obtained indicate the given temperature variation of structure of hexagonal dunite turned into orthorombik, with concentrations growing against the increase in the temperature of calcination.

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Home Page

OAI Link

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Editorial Address Department of Physics Universitas Negeri Padang UNP Prof. Dr. Hamka Street, Air Tawar, Padang 25131

Location Kota padang, Sumatera barat INDONESIA

Abstract

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Abstract

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