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INDONESIA
Pillar of Physics: Jurnal Berkala Ilmiah Fisika
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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Pengaruh suhu sintering pada penyerapan gelombang mikro nanokomposit NiFe2O 4 / PVDF untuk material penyerap radar (Sintering temperature effect on microwave absorption of NiFe2O4 / PVDF nanocomposite for radar-absorbent materials) Moulia Fadhilah; - Ramli; - Gusnedi; - Yohandri
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (602.338 KB) | DOI: 10.24036/6914171074

Abstract

Synthesis ofoNiFe2O4/PVDF nanocomposite with sintering temperature variations of 2500C, 280, 3000C, 3500C, 4500C has been done with the solgel method for microwave absorbing material (RAM).This material is to reduce reflections or absorb microwaves, so objects coated with RAM are not detected by Radio Detection and Ranging (RADAR). In making nanocomposite NiFe2O4 / PVDF, it includes the making of Fe3O4 precursor solution using iron sand, making NiFe2O4 solution, making NiFe2O4 / PVDF nanocomposite, printing, and  sintering. The samples were characterized by XRD. FTIR and VNA. For the analysis of microwave absorption ability as measured by the Vector Network Analyzerr(VNA), and then maximum Reflection Loss (RL) number was obtained at theesintering temperature of 2800C at -27.5767 dB at aafrequency off11.20 GHz which the X-Band region with microwaveeabsorption in coefficient amounting to 0.0417989142. Nanocomposite NiFe2O4 / PVDF can absorb microwaves ~ 96% at a frequency of 11.20 GHz. So, NiFe2O4/PVDF nanocomposite is suitable for Absorbing Radar Material
Analisis jenis batuan menggunakan metoda geolistrik tahanan jenis konfigurasi wenner di Bukit Apit Puhun Kecamatan Guguk Panjang Kota Bukittinggi (Analysis of rock types using the geoelectric resistivity method of the Wenner configuration at Apit Puhun Hill, Guguk Panjang District, Bukittinggi City) Mia Azhari
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (789.609 KB) | DOI: 10.24036/2041171074

Abstract

Bukit apit puhun located in West Sumatera traversed by active segment of sumatera named Sianok Segment. This condition cause Bukit Apit Puhun prone to earthquake. Erathquake caused the layer  composition of earth changed. Based on this condition,  rock structure research in Bukit Apit Puhun must be done. The research is basic research descriptively. Exploration was collected by resistivity Geoelectrical method wenner configuration.  Wenner configuration had a good vertical resolution and suitable for mapping rocks structure. The interpretation of the data was used Smoothness-Constraint Least Squares inversion to get resistivity and depth of rocks in 2D model cross section below the earth surface. Result of this research indicated the type of rocks in Bukit Apit Puhun were Clay, Sandstone, Limestone, Andesite, and Granite. Total distribution area of rocks that build Bukit Apit Puhun in five track that is Clay consists of 6.452,48 m2, Sandstone 16.988,28 m2, Limestone 40.661,39 m2, Andesite 8.951,72 m2, and Granite 7.919,08 m2. Based on this calculation, was found that Bukit Apit Puhun dominated by Limestone
Proses pembentukan feofotin daun suji sebagai bahan aktif photosensitizer akibat pemberian variasi suhu (The process of forming suji leaves feofotin as an active ingredient in the photosensitizer due to temperature variations) Ari Arfandi; - Ratnawulan; Yenni Darvina
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (527.329 KB) | DOI: 10.24036/512171074

Abstract

ABSTRACTCancer is one kind of disease that has difficulties to treat, can be cured by using drugs which derived from natural materials in Indonesia. This treatment know a cancer treatment that uses three important factors such as the photosensitizer, oxygen and light, whereas this cancer therapy called photodynamic therapy (TFD). Photosensitizer which is required can be obtained from the suji leaves (Pleomele angusti-folia NE Brown) that were heated. The purpose of this researchs determined the content amount of chlorophyll content that suji leaves before it was heated, and knew the maximum temperature required to produce feofitin with maximum absorbance value moreover, determined purpose of this research the correlation feofitin absorbance value and the number of chlorophyll content in suji leaves after heating process. Base heating process on the research conducted, the amount of chlorophyll content which in suji leaves have heating process is 11,26453 μg / ml, in addition the maximum absorbance value feofitin on process at 900C with a maximum absorbance value is 1,90130 μg / ml. moreover a correlation between the total value absorbance with the amount of content chlorophyll in the suji leaves, however the relationship is not continuous. Keywords: suji leaves, feofitin, photosensitizer
AUTOMATIC CHICKEN EGGS HATCHER USING DHT 22 SENSOR and DC MOTOR GEARBOX BASED ON ARDUINO YUNALDI YUNALDI; - Yohandri
PILLAR OF PHYSICS Vol 14, No 2 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/11632171074

Abstract

The hatching machine is one of the technological developments in the field of animal husbandry in increasing livestock productivity. Hatching eggs using an incubator is much more effective than natural/conventional breeding. The incubator is an incubator that has controlled temperature and humidity. Instruments used in the manufacture of hatching machines include a DHT 22 sensor which is used as a controller of temperature and humidity values, incandescent lamps are used as a heat source from the hatching machine, ultrasonic mist maker acts as a steam mist generator, DC motor is used as an egg turning rack driver, motor driver L298N acts as a DC motor movement controller, and Arduino Uno as a microcontroller that regulates all system work. This research was conducted with the aim of producing a hatching machine that is more complex and efficient. Based on data analysis carried out from the accuracy and thoroughness. The measurement accuracy ranges from 99.64% to 100%, while the measurement accuracy ranges from 99.64% to 100%, with an average measurement error of 0.178572%.
THE EFFECT OF THE AMOUNT OF IMMERSION OF ZnO DOPING Ag THIN LAYER ON BAND GAP WITH DIP COATING METHOD Farhan El Maulid; - Yohandri; Hary Sanjaya
PILLAR OF PHYSICS Vol 14, No 2 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12135171074

Abstract

The availability of fossil energy is decreasing day by day. Therefore, a New Renewable Energy solution is needed. One of the renewable energy is DSSC. DSSC is a photoelectrochemical-based solar cell that has a lower cost, less difficult preparation, and is environmentally friendly. DSSC be composed of working electrode, dye, electrolyte, and counter electrode. This researchintend to investigate the performance of the working electrode where the manufacture of a thin film using the dip coating method with variations in immersion and its effect on the efficiency of DSSC. This research is an experimental research. In this study, the semiconductor working electrode was made based on 9% ZnO/Ag synthesis by going through a sol-gel process. The working electrode was coated with variations of immersion 1, 3 and 5 times. The 9% ZnO/Ag thin layer was characterized by UV-DR Spectrometer. Based on the results, 9% Ag doped ZnO deposited on the ITO substrate with variations of immersion 1, 3 and 5 times showed, a band gap of 3.09 eV, 3.10 eV and 3.12 eV, respectively. Based on these data, it was applied to DSSC with the optimum efficiency shown at the electrode 1 time dip. Therefore, the greater the amount of immersion, the lower the efficiency of the DSSC.The availability of fossil energy is decreasing day by day. Therefore, a New Renewable Energy solution is needed. One of the renewable energy is DSSC. DSSC is a photoelectrochemical-based solar cell that has a lower cost, less difficult preparation, and is environmentally friendly. DSSC be composed of working electrode, dye, electrolyte, and counter electrode. This researchintend to investigate the performance of the working electrode where the manufacture of a thin film using the dip coating method with variations in immersion and its effect on the efficiency of DSSC. This research is an experimental research. In this study, the semiconductor working electrode was made based on 9% ZnO/Ag synthesis by going through a sol-gel process. The working electrode was coated with variations of immersion 1, 3 and 5 times. The 9% ZnO/Ag thin layer was characterized by UV-DR Spectrometer. Based on the results, 9% Ag doped ZnO deposited on the ITO substrate with variations of immersion 1, 3 and 5 times showed, a band gap of 3.09 eV, 3.10 eV and 3.12 eV, respectively. Based on these data, it was applied to DSSC with the optimum efficiency shown at the electrode 1 time dip. Therefore, the greater the amount of immersion, the lower the efficiency of the DSSC.
Analysis of Seismic Hazards and Vulnerability throughout Indonesia Based on 1999-2003 Earthquake Data Using the Microseismic Method muthia puteri amarda; - Syafriani
PILLAR OF PHYSICS Vol 14, No 2 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/11929171074

Abstract

Indonesia is an archipelagic country that has a complex geological structure. Its location at the confluence of three plates, namely the Eurasian plate, the Indo-Australian plate, and the Pacific plate causes high tectonic activity. This seismic activity causes high seismicity levels, especially along the subduction zone. An earthquake with a large magnitude can occur and cause a high level of damage, so it is necessary to know about the language of earthquake resistance. Earthquake vulnerability is useful for mitigating earthquakes that will occur so that people are more alert to earthquake disasters that can occur anytime and anywhere. This research is a descriptive type of research, namely by collecting data on the JINSET (Japan Indonesian Seismic Network) earthquake catalog in 1999-2003 with M greater than 5 S.R. Earthquake hazard data processing using geopsy software for HVSR analysis. The horizontal component data is divided by the vertical component in the frequency domain so that the H/V value is obtained.
SEISMIC RATE CHANGE ANALYSIS BASED ON SPATIAL DISTRIBUTION OF SEISMOTECTONICS IN NORTHERN SUMATRA Vicky Fikrotu Zakiyah; S Syafriani
PILLAR OF PHYSICS Vol 14, No 2 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12157171074

Abstract

The northern Sumatra has a high level of seismic activity. Before a significant earthquake occurs, there is a seismic quiescence phenomenon that precedes a significant earthquake.This phenomenon can be observed in seismic rate changes based on the spatial distribution of z-value.The data used are from the NEIC/USGS website, period 1990-2021. The study was conducted in five focus zones, three zones in the 2004 (9.2 SR), 2005 (7.8 SR) 2010 (7.1 SR) earthquake, two zones with coordinates 0.6-1.8 North Latitude and 96.8-97.6 East Longitude and zones with coordinates 3.6-4.8 North Latitude and 97.8-98.6 East Longitude. Using the z-value spatial distribution method, the region is divided into several grids. Z-value is calculated for each grid and describes the seismic rate change in the northern Sumatra. Based on the results obtained, before the 2004, 2005, and 2010 earthquake events, there was a seismic quiescence phenomenon that preceded the earthquake event. The seismic quiescence phenomenon appears afew years in early 2021 in a zone that has high seismic activity. Meanwhile, in zones that have low seismic activity, the increase seismic activity appears six years before the beginning of 2021. The spatial distribution of z-values in early 2021, there is a phenomenon of a decrease in seismic activity in several areas of northern Sumatra.
The Effect of Sintering Temperature on Hydrophobic Characteristic of Silica Manganese /Polystyrene (SiMn/PS) Nanocomposite Dian Septiana; - Ratnawulan
PILLAR OF PHYSICS Vol 14, No 2 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/11958171074

Abstract

Currently a lot of research has been done on hydrophobic layers, but in its application the layer is easily damaged and is not corrosion resistant. Therefore, this research intends to decide the effect of variations insintering temperature on the hydrophobic characteristic of SiMn/PS nanocomposite layers using a sintering temperature of 60oC,100oC,140oC,180oC and 200oC for 1 hour using a furnace.This research was conducted in the Material Physics Laboratoryof0theFacultyof0Mathematics and Natural Sciences and the Chemistry Laboratory of0th eFaculty of0Mathematics and Natural Sciences,Padang State University.This research uses HEM-3D (High Energy Milling Ellipse-3D Mention), XRD(X-RayDifraction) and0SEM (ScanningElectron Microscope) tools. The precursor was made by giving 0.5 grams of polystyrene, 0.2 grams of silica powder and 0.2 grams of manganese powder. Coating is done by spin coating method. The results of this research from the variation of the sintering temperature showed that the SiMn/PS nanocomposite layer was hydrophobic based on the contact angle test.The highest contact angle is at a temperature of 600C.Currently a lot of research has been done on hydrophobic layers, but in its application the layer is easily damaged and is not corrosion resistant. Therefore, this research intends to decide the effect of variations in sintering temperature on the hydrophobic characteristic of SiMn/PS nanocomposite layers using a sintering temperature of 60oC, 100oC, 140oC, 180oC and 200oC for 1 hour using a furnace. This research was conducted in the Material Physics Laboratory0of0the0Faculty0of0Mathematics0and0Natural0Sciences and the Chemistry Laboratory0of0the0Faculty0of0Mathematics0and0Natural0Sciences, 0Padang0State0University.This research uses HEM-3D (High Energy Milling Ellipse-3D Mention), XRD0 (X-Ray0Difraction) 0and0SEM0(Scanning Electron Microscope) tools. The precursor was made by giving 0.5 grams of polystyrene, 0.2 grams of silica powder and 0.2 grams of manganese powder. Coating is done by spin coating method. The results of this research from the variation of the sintering temperature showed that the SiMn/PS nanocomposite layer was hydrophobic based on the contact angle test. The highest contact angle is at a temperature of 600C.
CHARACTERIZATION STRUCTURE MICRO OF GRAPHENE OXIDE WHICH SYNTHESIS FROM BAGASSE WITH MODIFIED HUMMERS METHOD viola sesri wahyuli; - Ramli
PILLAR OF PHYSICS Vol 14, No 2 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12227171074

Abstract

This study aims to form a graphene oxide layer from bagasse, which by knowing the microstructure of the layer graphene oxide can be used as microwave absorption. In the process, bagasse is made into activated carbon with various carbonation temperatures, namely 300oC, 350oC, 400oC and 450oC. Then it was synthesized using the modified hummers method by mixing carbon with H2SO4, KMnO4, H2O2 and aquades. Then they were characterized using FTIR, XRD and SEM.Based on the FTIR data, it states that there is a relationship between carbon (C), hydrogen (H) and oxygen (O) which proves the formation of a graphene oxide layer. Also based on the results of XRD which states that the diffraction angle is in the range of 10o-90o and has the highest crystal size of 40.5267076 nm. Likewise, the results from SEM which stated that the best graphene oxide was at an average particle size of 81,4043598 nm. The resulting graphene oxide is also shaped like monolayer sheets.
THE EFFECT OF PH VARIATIONS ON THE STRUCTURE OF THE MnFe2O4/PS NANOCOMPOSITE LAYER AS SELF CLEANING Ipal Ipal; - Ratnawulan
PILLAR OF PHYSICS Vol 14, No 2 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12199171074

Abstract

Manganese is a metal element found in group VII, has an atomic weight of 54.93u, with a boiling point of 20320˚C, while the melting point is 12470˚C, and has a reddish-gray color. Iron (III) oxide (Fe2O3) or also known as hematite or maghemite iron ore, iron hematite (α – Fe2O3) is a simple oxide which has a hexagonal (rhombohedral) structure and has the R3c space group. Manganese was used as reinforcement in this research, while the matrix used was polystyrene. In this study, 5 variations of pH MnFe2O4/PS, namely 5,6,7,8 and 9 nanocomposites were synthesized using the spin coating method with manganese oxide (MnO2) and iron ore (Fe2O3) precursors. The composite gel is dropped on the glass substrate then the drying process is carried out in an oven. MnFe2O4/PS nanocomposites were characterized using X-Ray Diffraction (XRD). giving acid and alkaline solutions affects the size of the crystals, when adding a base (25% Na4OH) the crystal size becomes small while when the acid is added (100% CO3COOH) the crystal size is larger. : pH 8: pH 9 an increase in crystal size and grain size occurs.

Page 23 of 30 | Total Record : 297

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