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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 270 Documents

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Identifikasi jenis batuan menggunakan inversi marquardt data geolistrik tahanan jenis konfigurasi dipole-dipole Bukit Lantiak Kecamatan Padang Selatan (Identify rock types using inversion marquardt geoelectrical data resistivity dipole-dipole configuration in Bukit Lantiak, Padang Selatan District) Jemmy Rohmana; - Akmam; - Mahrizal
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The purpose of this research was to describe the type and the depth of rocks in Bukit Lantiak Padang Selatan. The type and the depth of rocks was needed to minimize the hazard caused landslide in the research area. This research use geophysical exploration method. Equipment that use was Automatic Resistivity (ARES) with Dipole-dipole configuration. The interpretation of the data in this research uses Marquardt inversion method to process the measurement data. Data was interpreted to get resistivity value and depth of rock in 2D model cross section below the earth surface. Result of this research indicates the type of rocks in Bukit Lantiak Padang Selatan is Andesite, Sandstone, Limestone, and Clay. These results indicate that the slopes of Bukit Lantiak composed by a mixture of hard rock layers that Andesite with soft rock layers that Clay and Sandstone. It show that Bukit Lantiak area have rock layers that are susceptible to landslides

Pembuatan tool pemodelan eksperimen gerak parabola dengan pengaturan sudut elevasi untuk analisis video tracker (Experimental modeling tools fabrication for parabolic motion with elevation angle settings for video tracker analysis) Atika Irbah; - Asrizal
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Physics has an important role in the development of Science and Technology. One interesting phenomenon of motion in physics, namely parabolic motion. The importance of the parabolic motion instrument is to understand various types of parabolic motion concepts. From the result of observation, it was known that the parabolic motion experiment was still done manually, namely the measured physical quantities were limited and It can’t display the graph. Experimental tools have weaknesses in parabolic motion experiment activities because they weren’t effective when used. One solution to overcome this weakness is developing a tracker video analysis and modeling tool. The purpose of this research is to determine the performance specifications of a parabolic experiment modeling tool, the design specifications of a parabolic experiment modeling tool, and the effect of the elevation angle change of a parabolic experiment modeling tool. This research can be classified into engineering research method, namely a research method to design a process, product or prototype to make a new contribution. Data collection is done in two ways, namely directly and indirectly measurement. Direct measurement is done by varying the level of the launcher angle in the parabolic motion experiment modeling tool. Indirect measurement is used to determine the accuracy and precision of the parabolic motion experiment modeling tool. Data of the measurement results were analyzed with descriptive statistics in the form of graphs and tables. Based on data analysis, it can be stated that there are three research results. First, the main performance specifications of the parabolic motion experiment modeling tools include: the tool frame size is 14x15x22.5 cm3 and the regulator of elevation angle is done by using the MG995 servo motor. Second, the average accuracy of the experimental results of the modeling tool is 97.38%, while the its average accuracy is 98.59%. Third, the change in elevation angle influences on the time to reach the peak point, maximum height, and time when reaching the maximum distance. The greater the elevation angle causes the value of the time to reach peak point, the maximum height value, and the time to reach the maximum distance also greater. The elevation angle also affects to the maximum distance. From the result of the analysis, it can be confirmed that the maximum distance is obtained when the elevation angle is 45o.

Analisis sistem instrumen intensity meter p-alert dan data hasil pengukurannya (System analysis of the intensity meter p-alert instrument and its measurement data) Yeni Rahman; Zulhendri Kamus; Rachmad Billyanto
PILLAR OF PHYSICS Vol 5 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Earthquake would cause ground acceleration. To the ground acceleration can be measured by using intensity meter p-alert instrument. Instrument compiled of sensor, modem, hub D-Link, and display. This research to describe the constituent components and data analysis. The sensor used in instrument is triaxial MEMS accelerometer ADIS16223 and digital signal processing component used microcontroler MaximMAX7219 with RJ45 data communication. Data analysis of peak ground acceleration for five times earthquakes use P-Alert Early Warning software

Magnetoresistance characterization of nanocomposite Fe3O4 / PPy that synthesized with sol-gel spin coating method Surya Pertiwi; - Ramli
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Indonesia is a rich country that has various natural resources, one of which is in the form of mining materials such as iron sand which contains a lot of magnetite (Fe3O4). Magnetite (Fe3O4) has superior properties compared to others so that magnetite (Fe3O4) is a top priority in research activities that are rapidly developing in world research. Polypyrrole (PPy) is a conductive polymer which has several advantages. Fe3O4 nanoparticles are a type of magnetic material that has considerable potential in GMR magnetic sensor applications. The aim of this research is to synthesize and characterize the effect of Fe3O4 composition on the magnetoresistance properties of Fe3O4/PPy nanocomposites synthesized by the Sol Gel spin coating method. In this study, several stages were carried out, namely: the sample preparation stage, the nanocomposite manufacturing stage, the characterization stage and the data analysis. Fe3O4/PPy thin layer nanocomposite is made from iron sand that has been purified and milled by previous researchers. Fe3O4/PPy nanocomposites were prepared using the sol-gel method with a variation of Fe3O4/PPy concentrations of 30%, 40%, 50%, 60% and 70% and then grown using the spin coating method with a rotating speed of 3000 rpm for 60 seconds, the thin layer formed was dried using a furnace at 5500C for 1 hour. Then the thin layer was characterized using XRF, FTIR, SEM and FPP. Based on all the characterizations that have been obtained, a thin layer of nanocomposite has been successfully grown on glass preparations. Fe3O4/PPy nanocomposite thin layer is a thin layer that has good magnetoresistance properties, this is shown in the results of testing the magnetoresistance properties using the Four Point Probe (FPP) method.

Pengaruh waktu milling terhadap dan ukuran butir forsterite (Mg2SiO4) mineral serpentin dari Kabupaten Solok Selatan Sarimai Sarimai
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

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

HAZARD SEISMIC ZONATION ANALYSIS OF WEST SUMATRA REGION USING PROBABILISTIC HAZARD SEISMIC ANALYSIS (PHSA) METHOD Mudzullah Rajif; Syafriani Syafriani
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: 10.24036/10753171074

Indonesia is one of the countries that is prone to high intensity seismicity, where Indonesia is located between three main plates, namely the Eurasian plate in the north, the Indo-Australian plate in the south and the Pacific plate in the northeast. As a result of the meeting of the three plates, Indonesia has a high level of seismicity both on land and at sea. One of the provinces with a high level of earthquake hazard is West Sumatra. Seismic hazards are useful in designing earthquake-resistant buildings and can describe the effects of earthquakes at a location which will help in anticipating community preparedness and earthquake disaster mitigation efforts. This type of research is descriptive, namely by collecting catalog data for the NEIC / USGS earthquake with the period 1969-2019 with M ≥ 5 S.R. Seismic hazard data processing uses the probabilistic seismic hazard analysis (PSHA) method. PSHA is based on earthquake parameters that produce the greatest ground motion. The magnitude of the intensity at a location due to an earthquake in the earthquake source area with a magnitude M and a distance of R can be used as an attenuation function. The attenuation function used in this study is Joyner-Boore (1997) and Young et al (1997). The results show that the largest seismic hazard occurs in the PGA with a maximum range of 1.28 g - 3.69 g in the Mentawai Islands region. The seismic hazard level is in the Bukit Barisan area with a maximum PGA value of 1.72 g - 2.12 g.

Analysis of Fe3O4 thin film electrical properties prepared from iron sand at Tiram Beach, Padang Pariaman Regency, West Sumatra by using the sol-gel spin coating method Fitria Murti; Ramli Ramli; Yenni Darvina
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Indonesia is a country that has a considerable amount of mining products such as iron sand that can be found along the beach, one of them is the Tiram Beach in Padang Pariaman district, West Sumatera. Iron sand can be applied to electronics, computing, and the automotive industry sector because it contains magnetic material. Magnetite iron sand is iron oxidation which has the strongest magnetic characteristic, which is made in nano size has ferromagnetic characteristic and has a wide application, the development of ferrite materials in the form of thin layer oriented to recording media and also can be used as a magnetic sensor device. The research is to inquire effect spin coating velocity on conductivity of thin layer.In the research, variation of spin coating velocity 1000 rpm, 2000 rpm, and 3000 rpm are done with the time of 60 seconds toward magnetite gel solution which has been sol-gel, after rotated then the thin layer formed is measured by using four point probe method. The result from research obtained conductivity value that is on velocity 1000 , 2000, and 3000 rpm conductivity value shows that the effect of spin coating velocity on the magnetite thin layer conductivity that is the higher it is spin coating speed, the higher it is the conductivity

PENGARUH WAKTU SPIN COATING TERHADAP STRUKTUR DAN SIFAT LISTRIK SEL SURYA PEWARNATERSENSITASI Desi Susanthy
PILLAR OF PHYSICS Vol 3 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Energy crisis that hit the world can be perceived by the people of Indonesia. Alternative solution to this problem needs to be done such as utilizing solar energy. Solar Cells Dyes sensitized is a device that converting solar energy to electrical energy by using the interaction of photons with the photosensitizer. Generally, the solar cell is composed of electrodes, dye, electrolyte, and semiconductors. In this research, Dye use mangosteen peel. The purpose of research is to determine the effect of film thickness on the electrical properties of the solar cell. Based on the results of measurements and data analysis, there are of research such as of spin coating. There are sereval result of research such as; first, varying thickness depending time of spin coating. Thickness of sample are 67.8 µm for 2 minutes, 66.1 µm for 4 minutes, 63.0 for 6 minutesand 59.6 µm for 8 minutes; second, absorbance value of dye with 338.17 nm wavelenght is 2.270; the last, the samples produce 20 µA current and 130 mV voltage for 67.8 µm film thickness, 500 µA and 213 mV for 66.1 µm, 18 µA and 15 mV for 63.0 µm and 12 µA current and 1.7 mV for 59.6 µm. Keywords: TiO2 thin film, method of spin coater, DSSC, natural dye, fotosentitizer.

Analisis sifat listrik nanokomposit NiFe2O4/PANi yang disintesis dengan metode sol gel (Analysis of the electrical properties of NiFe2O4 / PANi nanocomposites synthesized by sol gel method) Sri Rahma Yani; Djusmaini Djamas
PILLAR OF PHYSICS Vol 12, No 1 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

NiFe2O4/PANi nanocomposite was synthesized using the sol gel method with satisfying 2.5%, 5%, 30%, 50%, and 70% NiFe2O4 to PANi. Characterization of particle size, sample thickness, conductivity, and capacitance using X-ray diffraction (XRD), Scanning Microscope Electrons (SEM), and LCR Meter. Information sizes in 2.5%, 5%, 30%, 50%, and 70% are 37.16 nm, 54.16 nm, 31.2 nm, 42.23 nm, and 39.16 nm respectively. The electrical properties of NiFe2O4 / PANi Nanocomposites are used by using LCR meters, namely resistance and capacitance. The values of electrical conductivity generated from various meetings were 2.5%, 5%, 30%, 50%, and 70%, respectively 0.13 S / m, 0.08 S / m, 0.16 S / m, 0.57 S / m, and 0.25 S / m. From the measurement results show that the values of electrical conductivity in NiFe2O4 / PANi 2.5% high compared to NiFe2O4 / PANi 5% and again increase along with the increasing composition of NiFe2O4. However, in the condition of NiFe2O4 / PANi nanocomposite 70% electrical conductivity decreased. For large amounts of NiFe2O4 to PANi, the electrical conductivity increases. NiFe2O4 / PANi capacitance through a difference of 2.5%, 5%, 30%, 50%, and 70% resulted from successive measurements of 193.32 nF, 83.77 nF, 0.001 nF, 0.55 nF, 0 , 44 nF. The capacitance of NiFe2O4 / PANi shows that the greater the amount of NiFe2O4 to PANi the capacitance decreases.

Identifikasi bidang gelincir menggunakan metode geolistrik tahanan jenis konfigurasi Schlumberger di Bukit Lantiak Kecamatan Padang Selatan (The identification of the slip surface using the geoelectric resistivity method of the Schlumberger configuration in Bukit Lantiak, Padang Selatan District) Irepia Refa Dona; - Akmam; Nofi Yendri Sudiar
PILLAR OF PHYSICS Vol 5 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The identification of slip surface in Bukit Lantiak Padang Selatan has been done. The aim of this research is to know the shape of slip surface, depth of slip surface, and angle of slip surface. Data were collected by Automatic Resistivity Multielectrode in 4 lines with Schlumberger configuration. Interpreted of data was done with Robust Constraint Inversion. The result of this research shows that slip surface is Translation slip. Depth of slip surface are 12,8 m and 4,5 m. Angles of slip surface are 34,980 and 25,940.

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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

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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