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All Journal PENDIPA Journal of Science Education Jurnal Pengabdian Masyarakat dan Riset Pendidikan
Sumihar Simangunsong
Institut Sains Dan Teknologi TD Pardede Medan
Humanities Chemistry Education Languange, Linguistic, Communication & Media Mathematics Other

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Cognitive Improvement in Thermodynamic Functions With Calculus Chain Rule Sumihar Simangunsong
PendIPA Journal of Science Education Vol 8 No 1 (2024): February
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/pendipa.8.1.50-56

Abstract

This research was motivated by the low ability of students to apply mathematical solution methods to thermodynamic functions. Thermodynamic functions are functions that consist of pressure, temperature, volume and enthalpy functions where changes in one function can occur due to changes in other functions. The aim of this research was to show the implementation of chain rules in thermodynamic function problems by relying on a process technique to improve students' cognitive awareness of thermodynamic functions. The place of this research was at the TD Pardede Institute of Science and Technology. The process of understanding chain rules is very impactful for understanding thermodynamic state functions. Differential decomposition of functions within functions is also described in the chain rule method. Thermodynamic functions which consist of pressure, temperature, volume and enthalpy functions can depend on each other so that the chain rule analysis method can be clearly used. With this method students will also be given the opportunity to connect one concept with other thermodynamic concepts. Apart from that, this method can be used anywhere. This shows a cognitive increase in terms of cognitive elements, cognitive structure and cognitive function.
Analysis The Wave Equation Of The Dispersion Term On The Wave Group Velocity Sumihar Simangunsong
Jurnal Pengabdian Masyarakat dan Riset Pendidikan Vol. 4 No. 3 (2026): Jurnal Pengabdian Masyarakat dan Riset Pendidikan Volume 4 Nomor 3 (Januari 202
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jerkin.v4i3.5440

Abstract

This study aims to obtain the dispersion equation for the group velocity of waves in a medium. A dispersive medium is a medium in which, when a wave enters the area, the wave undergoes changes in shape and energy. The purpose of this study is to demonstrate how the integral integration method obtains the dispersion equation. This research is qualitative. The location of this research is at the TD Pardede Institute of Science and Technology. From the analysis in this study, it was found that the wave intensity decreases towards the depth of the dispersive medium, assuming that the attenuation coefficient (μ) remains continuous throughout the depth of the material the wave passes through. In the case of seismic waves, when the wave travels through a medium, its intensity decreases with distance. When the absorption coefficient a = 0, the wave is not absorbed but reflected, and when a = 1, the wave is completely absorbed. If a = 0.5, 50 percent of the energy is absorbed. This absorbed energy is converted to heat. In some cases, the absorbed energy can increase the energy of the particles of a substance.
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