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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 10 Documents
 1 
Search results for , issue "Vol 16, No 1 (2023)" : 10 Documents clear
Analysis of Liquefaction Potential in Sungai Limau District Padang Pariaman Regency Using the Multichannel Analysis of Surface Wave (MASW) Method Angeline Chika Rorensia; - Syafriani; - Hamdi; - Akmam; Letmi Dwiridal
PILLAR OF PHYSICS Vol 16, No 1 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/14326171074

Abstract

Sungai Limau is one of the sub-districts in Padang Pariaman Regency which was badly damaged by the earthquake on 30 September 2009. Geologically, the Sungai Limau area is included in the category of cambisol soil types in the form of layers of sand, making it vulnerable to liquefaction due to earthquakes. This research was conducted to analyze the liquefaction potential using the Multichannel Analysis of Surface Wave (MASW) method. The MASW method can produce 2D Vs profiles to describe the structure and types of rock-forming materials at each depth and layer. This method can detect underground surfaces Vs to a depth of 30 meters. Data collection was conducted at Sungai Limau using the sysmatrack-MAE tool with 4 observation tracks. Each measurement uses a distance between geophones of 4 meters. The Vs results from MASW will be compared with the classification of soil types from UBC 1997. The average results of the shear wave velocity at a depth of 30 m (Vs30) in this study are 322.9 m/s for the first track, 303 m/s for the second track, 311 m /s for the third and fourth track. The four tracks fall into the same classification, namely medium soil type (class D). The results of the liquefaction potential analysis using the MASW method show that the first line has a high level of liquefaction potential in the third layer with a value of Vs 337 m/s (class D). The second track has a high level of liquefaction potential in the third layer with a value of Vs 314 m/s (class D). The third track has a fairly high level of liquefaction potential in the second layer with a value of Vs 209 m/s (class D). The fourth track has a high level of liquefaction potential in the second layer with a value of Vs 198 m/s (class D). The fourth and fifth layers on the entire track have no liquefaction potential with Vs ranging from 400-550 m/s (Class C).
Maximum Power Point Tracking Solar Charge Controller Based on Internet of Things with Smartphone Display Ushalli, Muhammad Ajriy; Yulkifli, Y; Mairizwan, M; Anshari, Rio
PILLAR OF PHYSICS Vol 16, No 1 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/13584171074

Abstract

Electrical energy is a very important thing in life, but the main source at this time is still using limited materials. The solution to this problem requires renewable energy as an alternative source. This research discusses solutions with the use of solar cells. Harvesting of solar cell power is carried out using a Maximum Power Point Tracking (MPPT) based on Internet of Things (IoT). This research is classified as development research. The purpose of this research is the performance specification and design specifications. The data obtained in this study are comparisons of MPPT data and not using MPPT, and also accuracy and precision data of the instrument. Data collection was carried out on August 7, 2022 at 10.00 WIB - 16.00 WIB. In the study, it was found that the power harvested using the MPPT system was much better than without using the MPPT system. The system performance specifications are built with various electronic components and microcontrollers, all components are included in a box measuring 20cm x 15cm x 9cm. design specifications obtained an good data with MPPT based on IoT. The value of accuracy instrument is obtained 93,87% and the precision value of the instrument is obtained 94,944%. And also obtained good data transfer capabilities from the instrument, so that data transfer can be done continuously. with the method used, the research went well and in line with expectations
Three Axis Vibration Measuring Instrument using a Smartphone Display-based Accelerometer Sensor Theja Lufiandi R; - Yulkifli; Mona Berlian Sari; - Asrizal; - Syafriani
PILLAR OF PHYSICS Vol 16, No 1 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/13813171074

Abstract

Applications for vibration measurement include machine analysis, measuring vehicle stress, and monitoring building structures. Modern vibration measurement instruments are typically expensive, intricate, and not necessarily readily available to everyone. This research creates and develops a vibration measuring tool that makes use of an accelerometer sensor and a smartphone as a display because of this. Vibration data from the sensor can be transmitted via the Internet of Things, passed through a microcontroller, and then received on a smartphone. This measurement device has the benefits of being simple to use, widely available, and inexpensive. The Four-D (4-D) model is utilized in the Research and Development (R&D) technique. Define, design, develop, and desiminate make up the 4-D approach. A tool that can detect in three dimensions from the x, y, and z axes is the outcome of this research. This tool's design incorporates a smartphone as the display, an ADXL345 accelerometer as a sensor, and a NodeMCU ESP32 microcontroller as a microcontroller. The average accuracy and precision of this tool are 100% and 92%, respectively. It is anticipated that the creation of this measuring tool would expand the accessibility of more effective vibration measurement tools that can be applied in a variety of contexts.
Analysis of Limestone Magnetic Susceptibility Value as a Cement Manufacturing Material using Bartington Magnetic Susceptibility Meter Yogi AlFajar; - Hamdi; - Syafriani; Fatni Mufit
PILLAR OF PHYSICS Vol 16, No 1 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/13670171074

Abstract

Limestone is the main ingredient for cement formation, 80% of the amount of Limestone used in cement formation, but there is very little research on Limestone, even though Limestone is very influential on the maximum compressive strength of cement. The purpose of this study was to obtain a new standard for cement based on the abundance of magnetic minerals indicated by the value of their Magnetic susceptibility, especially in Limestone which is the maining redientin cement manufacture, and also the lack of research on the susceptibility and types of minerals contained in Limestone. The method used in this study is a magnetic method where the magnetic susceptibility value of the sample is measured using a Magnetic Susceptibility Meter type MS2B. Limestone magnetic susceptibility value from PT. Semen Padang has a range of values from 17.6 x 10-8m3/kg to 90 x 10-8 m3/kg and has a dominant value, where Limestone has little or almost no Superparamagnetic grains, the reisonly one sample that has Superparamagnetic grains. Based on the range of magnetic susceptibility values obtained the magnetic properties of Limestone from PT. Semen Padang is Antiferromagnetic and has a type of magnetic mineral, namely Hematite
IoT-based Wind Speed Measurement System Alif Yulanda Putri; - Yulkifli; - Syafriani; Yenni Darvina
PILLAR OF PHYSICS Vol 16, No 1 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/14314171074

Abstract

Weather is the state of the atmosphere at any time which is expressed by the high and low values of the weather element parameters. Observations of weather elements are carried out so that they can be used as needed in the future. This study aims to determine the performance and design specifications of a wind speed measurement system based on the internet of things with a smartphone display. This measuring instrument is built using a wind speed sensor, namely a wind speed sensor as a speed sensor, Arduino Uno to connect sensor readings to NodeMCU, the NodeMCU ESP8266 microcontroller which is used to access the internet network so that it can be sent to the thingspeak server and data from thingspeak is displayed on an android smartphone using inventory application. The results of measuring, testing, and analyzing wind speed using the Internet of Things and a smartphone display, namely Arduino Uno, process the wind speed detected by the wind speed sensor before sending it to NodeMCU ESP8266. After that, the data is sent to the thingspeak server which will be displayed on the Android phone. Second, the average accuracy of wind speed measurements on the first, second, and third days were 95.96%, 94.83%, 96.16%, and the average accuracy of wind speed measurements on the first, second, and third days were 92.85%, 94.43% and 96%. 
Crop Phenology Mapping using Polarimetric Parameters extracted from Sentinel-1 Images Mirza Muhammad Waqar; Rahmi Sukmawati; heein Yang
PILLAR OF PHYSICS Vol 16, No 1 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/14431171074

Abstract

Accurate and high-resolution Spatio-temporal information about crop condition and phenology is a vital component for crop management and yields estimation at the local scale to regional scale. In this research, the crop phenology estimation is carried out using time-series Sentinel-1 dual-pol data. Sentinel- 1 data was acquired from January 2019 to December 2020 for Chinoat city of Pakistan. Backscattering coefficients (σo) for VH and VV channels were computed for each acquired image. Crop calendar for the local crop of Chinoat was acquired and (σo) were stacked according to the cropping season of rice, maize, and wheat. The unsupervised classification was performed using the ISO-Data clustering technique. The mean of each cluster was extracted corresponding to each data of acquisition and polarimetric parameter-based phenological profiles were plotted. Hermite polynomial fitting was performed to acquire smooth phenological profiles. Extracted phenological profiles were compared with the local crop calendar and the following crops were identified: rice, maize, and wheat-based on sowing, growth, and harvesting time information. The (σo) in VV channel does not provide consistent results that is why it was discarded from the analysis. However, (σo) in VH channel provides very precise crop profiles that coincide with the cropping pattern in the crop calendar. Finally, crop phenology mapping was carried and final crop maps are prepared.
Design and Construction of Modeling Tool of Linear Motion Experiment Assisted Toy Cars with Remote Control for Video Tracker Analysis Hanifa Yoanda; - Asrizal; - Yohandri; - Yulkifli
PILLAR OF PHYSICS Vol 16, No 1 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12829171074

Abstract

Physics has an important role in development and technology. Physics is concerned with experiment. From the results of research that has been carried out, it is known that there is no linear motion of  kinematics experiment with speed control and the use of an inclined plane for the sliding plane of the linear motion experiment. The limitation of the instrument in displaying physical measurement quantities is one of the reasons. To overcome this limitation, a modeling tool assisted by a remote control toy car and analyze it using tracker software  is created. The purpose of this study is to determine the performance specifications of the modeling tool for linear motion experiments assisted by a remote control toy car, determine the value of the accuracy and precision of the modeling tool, and also determine the correlation of physical quantities in linear motion experiments. Based on the results of data analysis using tracker software, there are three results can be explained. First, the performance specifications of linear motion experimental modeling tool with the length of the glide plane being 2 m and a width of 30 cm. The use of a dc motor, bluetooth module using an android connected to the HC-05. Second, the accuracy of the measurement of time and speed in the LMCV experiment was 98.4% and 97.2%. The accuracy values for the measurement of acceleration and velocity in the LMCA experiment were 95.53% and 95.5%. Third, in LMCV the correlation between position and time is in the form of a linear line, the correlation between velocity and time is in the form of a straight line with a constant value
Micro Structure Analysis of Graphne Oxides from Sawn Waste Synthesis using The Modified Hummer Method Gina Fadilah NST; - Ramli; Yenni Darvina; Fadhila Ulfa Jhora
PILLAR OF PHYSICS Vol 16, No 1 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/14256171074

Abstract

The manufacture of graphene oxide material based on sawmill waste charcoal has many applications in the field of technology, one of which is microwave absorption. Sawmill waste as the main ingredient is an effort to improve the processing of abundant sawmill waste. This study aims to analyze the microstructural properties of graphene oxide from sawmill waste synthesized by the modified hummer method. Graphene oxide synthesis was carried out using a modified hummer method which was characterized using a Scanning Electron Microscope (SEM), X-ray Diffraction (XRD ), and Fourier Transform Infrared (FTIR). Based on the results  from SEM, the temperatures of 250˚C and 400˚C are perfect graphene oxide blocks. At 300˚C, 350˚C, and  450˚C in the form of sheets. The best results on sem were obtained at 400C with an average diameter of 31.1nm. Based on the results of XRD, it showed a crystal structure in the form of graphene oxide 250˚C, 300˚C, 350˚C, 400˚C, and 450˚C namely Orthorhombic, Cubic, Tetragonal, Hexagonal, and Cubic with the best results at 400˚C where the size The largest average crystal is 53.1 nm. Based on the FTIR results, it contains C, H, and O bonds in the presence of C=O, C=C, O-H, and C-H bonds
Analysis of The Optical Properties of The Synthesis of Fe3o4/Pani Nanocomposites with The Sol-Gel Method using Spin Coating Nadya Aztifa; Yenni Darvina; - Ramli; Rahmat Hidayat
PILLAR OF PHYSICS Vol 16, No 1 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/14332171074

Abstract

Research has been carried out on the analysis of the optical properties of Fe3O4/PANi nanocomposites synthesized by the sol-gel method using spin coating. The purpose of this study was to determine the crystal structure, crystal size, surface morphology, and optical properties of the Fe3O4/PANi nanocomposite thin films. One of the applications of optical properties is that it can be used as a semiconductor. In this study, the primary material used was iron sand obtained from Oyster Beach, Padang Pariaman Regency, West Sumatra. Iron sand contains a magnetite (Fe3O4) phase, which has the highest magnetic properties, and the polymer used is a type of polyaniline polymer (PANi) which has good chemical stability. Fe3O4 acts as a filler, while PANi acts as a matrix. In this study, five variations of the composition of Fe3O4 in PANi were used, namely 30%, 40%, 50%, 60%, and 70%. For the method used, namely the sol-gel method and sample testing using XRD, SEM, and UV-Vis Spectrophotometer characterization tools. The results of the XRD characterization showed that each addition of PANi into Fe3O4 did not affect the resulting crystal structure and had a crystal size below 100 nm. SEM testing revealed the presence of agglomeration and particle size at variations of 30%, 40%, 50%, 60%, and 70% were 27 µm, 53 µm, 61 µm, 84 µm, and 46 µm respectively. And the results of the UV-Vis Spectrophotometer test obtained energy gap values for variations in the composition of Fe3O4 in PANi, namely 30%, 40%, 50%, 60%, and 70%, respectively, namely 2.51 eV, 2.39 eV, 2.18 eV, 2.35 eV, and 2.30 eV. Based on the research results, it can be proven that the Fe3O4/PANi nanocomposite thin layer is a semiconductor material because it is in the range of 0-3 eV.
The Effect of The Addition of Seaweed Charcoal (Sargasum sp.) With Pure Graphite on The Absorptive Properties of Graphene Oxide Syntheses Using the Hummer Modification Method Dicko Maulana Syahdan; - Ramli; Rahmat Hidayat; Yenni Darvina
PILLAR OF PHYSICS Vol 16, No 1 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/14304171074

Abstract

Graphene Oxide or Graphene Oxide (GO) Is a graphite oxide in the form of a monolayer obtained from exfoliating graphite oxide into sheets through a sonication or stirring process. In this study, the material used was a mixture of pure graphite and seaweed (Sargasum sp). Seaweed (Sargasum sp) is used as a mixture of pure graphite because the carbon content in seaweed (Sargasum sp) is good enough to reduce the use of pure graphite as the main ingredient in making graphene oxide. There are are 4 variations of composition with the aim of seeing the best results from these five compositions, namely the composition between Graphite and Sargassum sp, namely 70%: 30%, 60% ; 40%, and 50% : 50%. The research results obtained showed that graphene oxide had been successfully synthesized from the addition of seaweed charcoal because of some of the typical properties of graphene oxide. By X-ray diffractogram at an angle of 2, it was found to contain C-O, C=O, C=C, and O-H functional groups. In the VNA test, it obtained high reflection loss and adsorption coefficient values in a mixture of 50% pure graphite: 50% seaweed with a reflection loss value of -7.40 dB and an adsorption coefficient of 0.57342

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