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All Journal Pillar of Physics: Jurnal Berkala Ilmiah Fisika
Rio Anshari
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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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% 
Effect of Variation in Pineapple Leaf Fiber Composition with Polyurethane Matrix in Composite Panels on Acoustic Properties and Porosity Putra Adil; Yenni Darvina; - Ramli; 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: 10.24036/14571171074

Abstract

Noise can cause medical, psychological, and environmental disturbances. One of the efforts to reduce noise is by using acoustic materials. Acoustic materials can be made using natural fiber composites. This study uses pineapple leaf fiber as fiber and polyurethane as a matrix that will be formed into a sound-absorbing composite panel. This study aims are to determine the effect of variations in the composition of pineapple fiber-reinforced composites with polyurethane matrix on acoustic properties and porosity, determine the effect of frequency on acoustic properties, and determine the relationship between porosity and acoustic properties. The method used in this research uses a characterization tool in the form of a one-microphone impedance tube and porosity test equipment. Composite panels are made by varying the composition of pineapple leaf fibers with polyurethane matrix with the ratio of pineapple leaf fiber composition to polyurethane matrix, namely 50%: 50%, 60%: 40%, 70%: 30%, 80%: 20% and 90%: 10%. Based on the research, it was  found that the more the amount of pineapple leaf fiber composition is used, the absorption coefficient, sound transmission loss, and prostitution will increase while the reflection coefficient decreases. The higher the frequency used, the absorption coefficient and sound transmission loss will increase while the reflection coefficient decreases for all frequencies. The relationship between porosity and acoustic properties is that the higher the porosity, the absorption coefficient and sound transmission loss will increase while the reflection coefficient decreases
Co-Authors - Asrizal - Ramli Hufri Hufri Putra Adil Rahmat Dito Tri Wicaksono Yenni Darvina Yohandri