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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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Karakteristik bidang gelincir di Kecamatan IX Koto Sungai Lasi Kabupaten Solok berdasarkan metode geolistrik tahanan jenis konfigurasi Schlumberger (Characteristics of the slip plane in IX Koto Sungai Lasi Subdistrict, Solok Regency based on the geoelectric resistivity method of the Schlumberger configuration) Dori Purnama Sari; - Akmam
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Landslide is which one frequent disaster that caused by weathered soil which is characterized by the existence of slip surfaces. The aims of the research were to find out the shape, depth, and slope angle of slip surface at Sungai Lasi Solok base on Geoelectric Data. Data were collected by Automatic Resistivity System Multi-electrode. The interpretation of the Geoelectric data was used Two Dimensions Smoothness Constraint Least-Square Inversion Method. The slope angle of the slip surface was using the Trigonometry theory. The average results of the research are the shape, depth, and the slope angle of the slip surfaces are rotational slide for fisrt and second line and translational slide for third and fourth line, 32.2175 degrees and 11. 825 meters.

Karakterisasi mineral magnetik lindi (leachate) TPA Air Dingin Kota Padang menggunakan Scanning Electron Microscopy (SEM) (Characterization of magnetic leachate mineral at TPA Air Dingin Padang City using Scanning Electron Microscopy (SEM)) Yosi Apri Malita; - Ratnawulan; Fatni Mufit
PILLAR OF PHYSICS Vol 5 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Waste management in Indonesia is still mixed, between organic and inorganic materials and also have very high landfill waste. Increased precipitation will adversely affect the trash heap, where organic materials in the garbage will decay and will produce liquid waste. In order to manage waste properly at the end should require a final disposal (TPA) so that leachate generated from the decomposition of garbage can be channeled properly in pools shelters located in landfills is called leachate pond. In this research, the characterization of magnetic minerals leachate TPA Air Dingin Kota Padang. This study aims to look at the morphology and elemental composition of the leachate at six points on the leachate pond and river sampling, and sewer landfill. Characterization of magnetic minerals is done using a Scanning Electron Microscope (SEM) aims to look at the morphology , followed by Energy Dispersive spectroscope (EDS) aims to determine the elemental composition . This study used 10 samples taken from six points leachate ponds and 4 points of the river, and sewer . Leachate, rivers , and gutter first extracted with methanol using bath soap which aims to separate the magnetic and non-magnetic minerals. Magnetic mineral morphology analysis using SEM known , that the leachate, rivers , and ditch generally spherical mineral and square and there are many rengkahan . In addition, the size of grains of magnetic minerals belong to the group multidomain ie measuring >20 µm . The results of EDS analysis showed some dominant element in the leachate , rivers , and gutters are Fe , O , Ti , Mg , Al , C , and Si

The effect of composition of NiFe2O4 on the crystal structure of nanocomposite NiFe2O4 / PVDF that synthesized using sol gel spin coating method Yessy Arinda Putri; - Ramli
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

NiFe2O4 is a Ferrite Compound with the molecular formula MFe where M is a transition metal or alkaline earth is a magnetic semiconductor material with a spinel structure. The polymer used in this study is Polyvinilidene Flouride (PVDF). PVDF film is a material that is inexpensive, lightweight, flexible, has a wide frequency range, and is very sensitive. In this study 5 compositions were carried out namely ((50% : 50%), (33,3% : 66,6%), (25% : 75%), (75% : 25%), (66,6% : 33,3%)). Nanocomposites are synthesized using the sol-gel spin coating method. With making precursors (Fe(NO3) 3.9H2O and Ni(NO3) 2.6H2O. For the growth of thin films, the solution is dripped on a 0.5 cm x 0.5 cm glass substrate. Characterized using XRD (X-Rey Diffraction), SEM (Scanning Electron Microscope), FTIR (Fourier Transform Infra Red). Keywords : NiFe2O4,PVDF,Nanokompocite, Sol Gel, and Spin Coating

Analisis kadar logam berat pada limbah industri kelapa sawit berdasarkan hasil pengukuran atomic absorption spectrophotometry (AAS) Junika Wulandari
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Liquid waste of industry palm oil is the most abundant waste produced among other types of waste which is about 60% from 100% processing of fresh fruit bunches. Generally, industrial liquid waste contains heavy metals. Heavy metals are toxic if it exceeds the required levels. To determine levels of heavy metals toThe purpose of research is to test the linearity and sensitivity of heavy metals by AAS method, determine the metal content determine danger. Type of this research is laboratory exsperiment. Samples testing was conducted Baristand Padang. There were two samples group, those are waste palm oil of industry and well water around of waste. Analisys datatechniques which were used linear regression methods and corretation methods. Based on data analysis can be presented three results from research. First, test the linearity and sensitivity test on the validation of methods of analysis of Cu, Cd, Pb and Zn meet the requirements of its use. Second, the levels of Cu, Cd, Pb and Zn in the samples of waste palm oil and water well below the limit of detection of smaller instruments. Finally, the levels of Cu, Cd, Pb and Zn in samples of palm oil waste and water wells are not dangerous because it does not exceed the requirements of Regulation of the Minister of Environment of the Republic of Indonesia Number 5 of 2014 concerning water quality standard of waste and Government Regulation No. 82 of 2001 concerning the management of quality water and water pollution control

DEVELOPMENT OF COORDINATIONS TEST SYSTEM BASED ON ARDUINO Adibil Mahdi Rahmad Hidayat; Yohandri Yohandri
PILLAR OF PHYSICS Vol 14, No 1 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/10016171074

ABSTRACTIn sports activitiesaplaying tennis ball, a player will appear to haveagood coordination if he can move towards the ball while swinging his racket, then hit with the correct technique. At the moment, the catch and throw exercise is still counted manuallyowith the help of other people and is not veryieffective at doing it. catch is a test to determine the coordination between the eyes and hands using a tennisoball as a throw. The purpose of this study was to determine the performancetspecifications and designwspecifications of the Arduino-based fishing throwing tool to measure eye-handkcoordination. This re search includes engineering research. This study describes the performance specifications and designhspecifications of the catch and capture tool. The performance aspecification describes the function of the catch-and-catch tool builder, while the design specification describes the precision and precision of the tool. The measurement technique is carried out directly and iindirectly. Direct measurementscare made of the vibration and light intensity, while indirect measurements are carried out by analyzing the accuracy and accuracy of the catch and throw tool. The results of research on performance specifications and designuspecifications. First, the performance specification of the catch and catch device consists of an LDR sensor, a vibration sensor, and an electronic circuit that builds a catch-and-catch system. The secondaresult, the results of the design speccifications of this study consisted of the characterization of the tools and the accuracycof the catch and throw tool. The accuracy value of the catch throw tool is 100%.

Synthesis and characterization of Al2O3 nanoparticles using sol gel method by chelating extracts of starfruit (Averrhoa bilimbi) for nanofluid applications Kharisma Marta Judenta; Ratnawulan Ratnawulan; Gustaman Syarif
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Nanofluid has better thermal characteristics and better heat transfer coefficient compared to conventional coolant fluid [6].This makes the nanofluids has potential as a good alternative coolant fluid compared conventional coolant fluid. Nanofluids are a mixture of basic fluids such as water with solid particles of size 1-100 nm (Nanoparticles). In this study the nanoparticles to be used are Al2O3. The synthesis of Al2O3 was conducted by sol gel using chelation of Averrhoa bilimbi with calcination temperature of 1100 for 3 hours. Al2O3 powder obtained then characterized by using XRD. Furthermore, Al2O3 nanoparticles mixed into 100 ml of distilled water with concentration variations 0,2%; 0,5% dan 0,8% and characterized using test equipment Viscosity, Zeta Potential meter and Critical Heat Flux (CHF). Results obtained in the study was the effect of the addition of Averrhoa bilimbi extract as chelating against nanoparticles of Al2O3 to prevent agglomeration/buildup on each other. XRD data showed that the Al2O3 nanoparticles has crystallite size of 10,40 nm. Then the effect of addition Al2O3 nanoparticle concentration that were suspended in 100 ml of distilled water to the value of fluid Viscosity, Zeta Potential and Critical Heat Flux.Viscosity increases with the addition of Al2O3 nanoparticle concentration, at the same temperature (27°C) of optimum viscosity value at 0.8% concentration of 0.9830 mPa.s. Meanwhile, the potential zeta value also increases with the addition of Al2O3 nanoparticle concentration. The zeta potential value is optimum at 0.8% concentration of 35 mV. Furthermore the value of CHF at a concentration of 0.2%; 0.5% and 0.8% were 17.29%; 77.04% and 76.70% for each. Overall the value of CHF increases with the addition of Al2O3 nanoparticle concentration

PENYELIDIKAN BIDANG GELINCIR MENGGUNAKAN METODA GEOLISTRIK TAHANAN JENIS KONFIGURASI SCHLUMBERGER DI DESA KAMPUNG MANGGIS KECAMATAN PADANG PANJANG BARAT Lismalini Lismalini
PILLAR OF PHYSICS Vol 3 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The investigation of slip surface in Kampung Manggis Padang Panjang Barat has been done. The aim of this research is to know the shape of slip surface in that area. This research use resistivity geoelectrical method with Schlumberger configuration. Data are colected in four track which is made paralel by ARES (Automatic Resistivity meter). Processing of data was done using Res2Dinv v3.57 software with standard constraint least squares inversion in order to make 2D model of earth’s surface. The result of this research shows that slip sufrace is Translational Slip that is almost parallel with land surface. The resistivity values of first’s slip surface around 142.00-273.00 Ωm in 10.30 m deepness and the second one around 121.00–225.00 Ωm in 10.80 m deepness. The rock in slip surface is interpreted as Limestone. Keywords - Slip Surface, resistivity geoelectrical method, Schlumberger

Pembuatan set eksperimen gerak vertikal bawah berbasis Sensor Ping dan Sensor Photogate dengan tampilan PC (Fabrication of a set of bottom vertical motion experiments based on Ping Sensor and Photogate Sensor with PC display) Maria Idayu; - Yulkifli; Zulhendri Kamus
PILLAR OF PHYSICS Vol 12, No 1 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Perkembangan ilmu pengetahuan dan teknologi tidak terlepas dari peran berbagai disiplin ilmu yang ada, salah satunya Fisika. Salah satu fenomena fisika adalah gerak jatuh bebas. Penelitian ini menjelaskan spesfikasi desain, validasi dan spesifikasi performansi set eksperimen gerak jatuh bebas. Hasil dari sistem performansi set eksperimen gerak jatuh bebas ini terdiri sistem mekanik dan elektronik. Sistem mekanik terdiri dari sensor photogate,sensor ping, sensor getaran, statif, lengan statif, dan dasar statif. Sistem elektronik set eksperimen gerak jatuh bebas terdiri dari catudaya, rangkaian LCD, rangkaian reset, rangkaian pengontrolan magnet, rangkaian sensor getar, rangkaian sensor ping dan rangkaian sensor photogate. Hasil darispesifikasi dari set eksperimen gerak jatuh bebas terdiri dari ketelitian, ketepatan dan validasi alat. Ketepatan pengukuran set eksperimen ini adalah 97,84%, ketelitian dari set eksperimen ini adalah 99,63% dengan standar deviasi sebesar 0,00022 dan validasi set eksperimen ini berada pada kriteria sangat valid dengan nilai rata-rata validasi tenaga ahli adalah 86,66%.

Pembuatan sistem interface digital untuk display data getaran dua dimensi dengan sensor fluxgate ( Making of a digital interface system for displaying two-dimensional vibration data with a fluxgate sensor) Zulpadrianto Zulpadrianto; - Yulkifli; - Yohandri
PILLAR OF PHYSICS Vol 5 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

In this article will be discussed about data interface of two-dimensional vibration detection using fluxgate sensors. Making the interface uses two programs are the program MPLAB X IDE V1.70 and Visual Basic programs in C #. MPLAB X IDE V1.70 program is used to program the analog data into digital data and program the data to be able to be connected via USB to a personal computer. Using the Visual Basic programming language C # aims to display digital data on personal computer in real time graphical form and the data stored in the xls extension. This research is a laboratory experiment. Data interface results will be displayed in the form of a graph consisting of vibration detection by fluxgate sensor vertically and horizontally. Extension xls stores data in excel format with the data stored in the form of the maximum scale and the delivery time of data from the vibration detection by fluxgate sensor. The personal computer interface signals for analog data that has been converted into digital data in PIC 18F4550 microcontroller

Pengaruh komposisi MnFe2O4 terhadap sifat listrik nanokomposit MnFe2O4/ PVDF yang disintesis dengan metode spin coating (The effect of MnFe2O4 composition on the electrical properties of MnFe2O4 / PVDF nanocomposites synthesized by the spin coating method) Onny Gustira; Yenni Darvina; - Ramli
PILLAR OF PHYSICS Vol 13, No 1 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Manganese ferrite (MnFe2O4) has an MnFe2O4 structure in which its manufacture uses manganese mineral powder. MnFe2O4/ PVDF nanocomposites are made in the form of thin films to see the electrical properties that are affected by variations in composition. MnFe2O4/ PVDF nanocomposites were characterized using XRD, FTIR and FPP. The XRD characterization results show that the Monoclinic Crystalline form for PVDF and Cubic for MnFe2O4, the angular value of 2θ formed is the greater the composition of MnFe2O4 from small to large used, then MnFe2O4 and PVDF are already present in the MnFe2O4/ PVDF angles which are seen in the composition of MnFe2O4 from small to large used, then MnFe2O4 and PVDF are already present in MnFe2O4 / PVDF diffraction peak. FTIR characterization results can be seen that MnFe2O4 successfully binds to PVDF, where Fe-O is a functional group MnFe2O4 and CH2 is a PVDF functional group. The results of the FPP characterization show that if the MnFe2O4 composition is getting bigger and the PVDF composition is getting smaller, the resistivity value is small and the conductivity value is greater.

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Contact Name
Syafriani

Contact Email
syafri@fmipa.unp.ac.id

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+6281267996692

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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