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All Journal Pillar of Physics: Jurnal Berkala Ilmiah Fisika
- Asrizal
Department of Physics, Universitas Negeri Padang, Jl. Prof. Dr. Hamka Air Tawar Padang 25131
Earth & Planetary Sciences Materials Science & Nanotechnology Physics

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Effect of Air Temperature, Air Humidity, and Air Pressure on Rainfall Based on Measurement Result in Kototabang Syahrul Gunawan; - Asrizal; - Hufri; Letmi Dwiridal; Ikhsan Buyung Arifin; Fahmi Rahmatia
PILLAR OF PHYSICS Vol 15, No 2 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/13007171074

Abstract

Weather has a close relationship with community activities in Kototabang. Weather information can be used so that the risk of crop failure and disaster hazards can be minimized. Research to investigate the relationship of weather parameters was carried out using descriptive research with the multiple linear regression method. The variables in this study were divided into independent variables of air temperature, air pressure, and humidity, and the available variable was rainfall. The research method used is a multiple linear regression method with secondary data measurement of AWS and AAWS in Kototabang. The multiple linear regression method aims to predict values based on independent variables. The characteristic of this method is the presupposition variable used by more than one variable. The data processing technique applied was a multiple regression linear with three predictors (temperature, humidity, and air pressure) with the characteristics of three predictors. The purpose of the translation technique, in general, is to describe the effect of the predicted parameters on rainfall. From the output obtained, it is explained that there is a positive contribution from the predictive variable to rainfall. The correlation that occurs from the output is also very strong, reaching an output value of 99.1%. Simultaneously and partially explained that there is a large enough change in the presumed parameters (air pressure, temperature, and humidity) to rainfall. This proves that there is a very rapid change between pressure, humidity, and air temperature to rainfall in Kototabang in 2020.
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
Development of Connected Wheel Motion Experiment System with Remote Laboratory Based IoT using the Web Rahmat Dito Tri Wicaksono; - Asrizal; - Yohandri; - Hufri; Rio Anshari
PILLAR OF PHYSICS Vol 16, No 2 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/15044171074

Abstract

Remote measurement is a trend that is in great demand today. The development of connected wheel motion experiment system with a remote laboratory is aimed at effectiveness in experimental activities. This research is based on the weaknesses of previous research that there is no login system, queuing system, and time limit for using the experimental system. Based on these weaknesses, this study provides a solution to the experimental system with a login system, queuing system, and time limit for using the device. The Design and Development (D&D) method is the method chosen in this study. From the data analysis it can be stated in general that there are two results in this study. The first result is the performance specification of the related wheel drive experimental system where the function of each component of the experimental system has a performance according to the function of each component. The second result is the accuracy and precision of the associated wheel motion experimental system. Accuracy results for concentric wheels, obtained an average accuracy of 97.19% and 98.23%. Accuracy for connected wheels to ropes obtained an average result of 98.28% and 98.98%. The results of the angular velocity precision test on concentric wheels obtained an average of 99.43% and 99.09%. The precision of the angular velocity obtained on the wheels connected by a rope is 99.68% and 97.78% 
Co-Authors - Yulkifli Fahmi Rahmatia Hanifa Yoanda Hufri Hufri Ikhsan Buyung Arifin Letmi Dwiridal Rahmat Dito Tri Wicaksono Rio Anshari Syahrul Gunawan Yohandri