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<![CDATA[PEMBUATAN alat penentuan percepatan gravitasi bumi menggunakan metode pendulum berbasis sensor cahaya LDR ]]>
<![CDATA[Eka Putri Rinanthy]]>
<![CDATA[ PILLAR OF PHYSICS Vol 8 (2016) ]]>
Publisher : <![CDATA[Department of Physics – Universitas Negeri Padang UNP ]]>
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DOI: 10.24036/2488171074
<![CDATA[The acceleration of gravity on the second floor at laboratory of electronics and Instrumentation UNP, Padang city by gravity meter is 9.83 m/s2. The acceleration of gravity can be determined through several experiments, including experiments using pendulum method. Parameters of pendulum method still measured manually. The research was designed and created the determination of the earth's gravity acceleration appliance using a pendulum method based on light sensor (LDR). Measurement techniques directly at the output of the sensor LDR as the detector. This research is a laboratory experiment. There are three results of this research. First, performance specifications system consists of a mechanical system that pendulum framework as a holder with two boxes. Box where the circuit box system builder tool and laser as the detector. Second, the Arduino UNO microcontroller is used to process the input data determination earth's gravity acceleration appliance and the results of this research is value the acceleration of gravity on the second floor at laboratory of electronics and Instrumentation UNP, Padang city by determination earth's gravity acceleration appliance is 9,84 m/s2. Third, This instrument have highest precision and accuration, the relative accuracy of the average percentage is 99.77% with an average error of 0.23%, and accuracy average of 0.999 with a standard deviation by an average of 0.017 and a relative error an average of 0.171%.]]>
<![CDATA[Pembuatan alat ukur debit air menggunakan sensor aliran berbasis mikrokontroler Atmega328P ]]>
<![CDATA[Mardani Mardani]]>
<![CDATA[ PILLAR OF PHYSICS Vol 8 (2016) ]]>
Publisher : <![CDATA[Department of Physics – Universitas Negeri Padang UNP ]]>
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DOI: 10.24036/2497171074
<![CDATA[Has successfully made the water flow measuring devices using a microcontroller based flow sensor ATmega328P. This study included research into the laboratory experiments. The measurement technique does is measure directly and indirectly. Data obtained directly is the volume of water and the length of time water flows, while the data obtained indirectly is the flow of water. Based on the analysis of data can be revealed by some studies. First, the water flow measuring devices using ATmega328P microcontroller which serves to process the output of the sensor and change the sensor output with the expected output. Display the results of measurement of water flow measuring devices using LCD. The sensor used is a flow sensor that functions calculate how many liters of water out, how the water flow and how long the water flow. Second, water flow measuring devices have accuracy percentage of 94.5% sequentially, 98.5% and 97% for debit 0,11L / s. For the percentage of accuracy, at a discharge 0,11L/s and 0,05L/s is 99 % and 100 %.]]>
<![CDATA[Pengaruh waktu milling terhadap dan ukuran butir forsterite (Mg2SiO4) mineral serpentin dari Kabupaten Solok Selatan ]]>
<![CDATA[Sarimai Sarimai]]>
<![CDATA[ PILLAR OF PHYSICS Vol 8 (2016) ]]>
Publisher : <![CDATA[Department of Physics – Universitas Negeri Padang UNP ]]>
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DOI: 10.24036/2492171074
<![CDATA[West Sumatera has great amount of natural mineral resources of serpentine, one of them are found in Jorong Sungai Padi Lubuak Gadang, Kecamatan Sangir, Kabupaten Solok Selatan. The mineral of sepentine contains of forsterite which has higher economical value if it is in form of nano particle. The production of forsterite nano particle has been made by using synthesis substance which is expensive and needs longer process. The variation treatment of temperature calcination toward the mineral of sepentine shows the result that the dominate forsterite is at 800. The mineral of serpentine can be the alternative substance in the production of forsterite particle which is easily found in the nature and is not expensive. The purpose of the research is to investigate the effect of milling time toward size of nano particle of forsterite serpentine mineral in form of crystal and the size of the particle. The result of the research shows that the effect of milling time toward the micro-structure of forsterite which is viewed by based on the SEM result, it shows that the milling time impacts to the particle size which is the longer milling time, the smaller forsterite particle is produced. The grain size forsterite the lead in milling time 40 hours namely reached 385 nm]]>
<![CDATA[Sintesis nanopartikel zirkonium dioksida (ZrO2) dengan metode sol gel menggunakan ekstrak nanas sebagai pengkelat untuk aplikasi nanofluida pendingin ]]>
<![CDATA[Dini Talenti Arya]]>
<![CDATA[ PILLAR OF PHYSICS Vol 8 (2016) ]]>
Publisher : <![CDATA[Department of Physics – Universitas Negeri Padang UNP ]]>
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DOI: 10.24036/2487171074
<![CDATA[The study of the nanoparticles is rapidly growing in the industry. The application of nanoparticles is very useful in improving the thermal conductivity of the fluid coolant such as water and oil that are still low. Efforts should be made to improve the thermal conductivity of the cooling fluid by mixing nanoparticles into the basic fluid that is called Nanofluids. This study aimed to determine the effect of pineapple’s extract on the characteristics of nanoparticles of Zirconium Dioxide (ZrO2) in terms of phase and the value of the surface area of the particles of Zirconium Dioxide (ZrO2) by one gram of it and see the effect the composition of nanoparticles suspended in a fluid on viscosity, zeta potential increase in thermal conductivity. This research is an experimental research that is conducted at the Laboratory of Science Techno Centre of Science Nuclear Applied and Technology (PSTNT) National Nuclear Energy Agency (BATAN) Bandung. The synthesis was conducted by using sol gel with calcination temperature of 700 , ZrO2 powder obtained then characterized by using XRD and Surface Area Analyzer. Furthermore, Zirconium Dioxide (ZrO2) nanoparticles mixed into 100 ml of distilled water 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 pineapple extract as chelating against nanoparticles of zirconium dioxide (ZrO2) to prevent agglomeration/buildup on the particles of Zirconium Dioxide (ZrO2). The next result is the effect of the composition of nanoparticles of ZrO2 that were suspended in 100 ml of distilled water to the value of fluid Viscosity, Zeta Potential and rise of Critical Heat Flux. The bigger composition ZrO 2 led to a rise to the viscosity of Nano fluids water-ZrO2, the increase in the value of zeta potential and the increase of the value of Critical Heat Flux (CHF) associated with thermal conductivity values. The more viscous a fluid with the presence of nanoparticles, the conductivity value will be higher. High conductivity will improve the quality of the cooling fluid]]>
<![CDATA[Estimasi 3-d kedalaman batuan dasar menggunakan data geolistrik tahanan jenis konfigurasi dipole-dipole di Bukik Lantiak Padang Selatan ]]>
<![CDATA[Hamidah Hamidah]]>
<![CDATA[ PILLAR OF PHYSICS Vol 8 (2016) ]]>
Publisher : <![CDATA[Department of Physics – Universitas Negeri Padang UNP ]]>
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DOI: 10.24036/2496171074
<![CDATA[Bukik Lantiak which is located in Padang West Sumatera often has the landslide disaster. One of the factor that espouse landslide was the condition of the rock which was arrange the area such as bedrock. The type and the depth of bedrock in Bukik Lantiak was unknown. The research had done to know the type and the depth of bedrock. Resistivity Geoelectrical Dipole-dipole configuration was used as the method in this research. Interpreted of data had done with Smoothness-Counstraint Least-Square inversion. The research showed that the bedrock in the Bukik Lantiak is igneous rock, namely andesite. The bedrocks is found at a depth of more than 30 meters]]>
<![CDATA[Analisis kadar logam berat pada limbah industri kelapa sawit berdasarkan hasil pengukuran atomic absorption spectrophotometry (AAS) ]]>
<![CDATA[Junika Wulandari]]>
<![CDATA[ PILLAR OF PHYSICS Vol 8 (2016) ]]>
Publisher : <![CDATA[Department of Physics – Universitas Negeri Padang UNP ]]>
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DOI: 10.24036/2491171074
<![CDATA[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]]>
<![CDATA[Relokasi hiposenter gempabumi Sumatera Barat menggunakan metode double difference (DD) ]]>
<![CDATA[Anggina Wulan Dari]]>
<![CDATA[ PILLAR OF PHYSICS Vol 8 (2016) ]]>
Publisher : <![CDATA[Department of Physics – Universitas Negeri Padang UNP ]]>
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DOI: 10.24036/2486171074
<![CDATA[West Sumatra is located in an active subduction zone between the Indo-Australian plate with the Eurasian Plate and is along the Sumatra fault, so the West Sumatra earthquake prone. One way to understand the tectonic conditions of this region by relocating the earthquake hypocenter. Earthquake hypocenter result of BMKG has some weaknesses due to the program that used (SeiscomP) has a minimum depth of 10 km (fixed depth).Beside that velocity model of P wave which used by the system does not match with the actual geology condition of Sumatra Barat. The data used for the relocation of the hypocenter are taken for BMKG analysis system SeisComP the until period 1 May 2009 to 30 November 2015 by using HypoDD program with double difference method in it. AK 135 and Madlazim wave velocity model are used in the program. Double Difference method. So the velocity model errors can be minimized without using correction station. The results indicate earthquake hypocenter relocation in West Sumatra related to the fault, subduction process and Mentawai fault. The data relocation many as 1181 of the 1622 data. Based on the data obtained by percentage depth to a shallow earthquake relocation 79.3%, 45% intermediate earthquake and the earthquake in 0%. This is due to the deeper the layer, the higher the P wave velocity, so that the structure of the constituent layers will be more complex. Besides the depth of the earthquake below 10 km (fixed depth) after relocation has a variety of different depths. Earthquakes before relocating spread out so the (trendline) can not show a pattern corresponding to the main fault. Once relocated the (clusters) to form a group on the trend of the field fracturing or similar structure and distribution of earthquakes portrayed clearly. The RMS value after the relocation ranges between 0-1.5 and the RMS value before relocating ranging between 0-5]]>
<![CDATA[Pengaruh waktu milling terhadap ukuran butir forsterite (Mg2SiO4) dari batuan dunit di daerah Jorong Tongar Nagari Aur Kuning, Kabupaten Pasaman Barat ]]>
<![CDATA[Vera Firmansari]]>
<![CDATA[ PILLAR OF PHYSICS Vol 8 (2016) ]]>
Publisher : <![CDATA[Department of Physics – Universitas Negeri Padang UNP ]]>
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DOI: 10.24036/2495171074
<![CDATA[Dunit made with material engineering techniques will bring up a new phase is forsterite. Forsterite has economic value. Forsterite in the formed nanoparticle size can be used as a coating material in the iron and steel melting place because the size of the nano has properties very strong, hard, and resistant to corrosion. The purpose of this study was to investigate the influence of milling time on grain size forsterite of rock dunit. Type of research is experiment. Method of research is forsterite synthesized by mechanical activation using the High Energy Milling 3D Ellipse to obtain nano grain size of forsterite. The results of the milling characterized using X-Ray Diffraction and Scanning Electron Microscope. The results of this study show the crystal structure that is formed during the milling time 5 hours, 10 hours, 20 hours, 40 hours is orthorhombic. Result of Scanning Electron Microscope the grain size of nanoparticle forsterite for variation milling 5 hours, 10 hours, 20 hours, and 40 hours are 630 nm, 717 nm, 454 nm dan 354 nm]]>
<![CDATA[Pengaruh waktu milling terhadap ukuran butir quartz dari Nagari Saruaso Kabupaten Tanah Datar ]]>
<![CDATA[Yuni Zahara]]>
<![CDATA[ PILLAR OF PHYSICS Vol 8 (2016) ]]>
Publisher : <![CDATA[Department of Physics – Universitas Negeri Padang UNP ]]>
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DOI: 10.24036/2498171074
<![CDATA[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]]>
