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All Journal Berkala Fisika Indonesia : Jurnal Ilmiah Fisika, Pembelajaran dan Aplikasinya Indonesian Review of Physics (IRiP)
Putri, Risky Afandi
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Astronomy Earth & Planetary Sciences Education Environmental Science Materials Science & Nanotechnology Physics

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The Effect of Electrode Gap on the Nucleation of CaCl2.6H2O by using Sharp End Copper Electrode Putri, Risky Afandi; Swandi, Ahmad; Rahman, Annisa; Anggraeni, Radhiah; Sutjahja, Inge Magdalena; Kurnia, Daniel
Indonesian Review of Physics (IRiP) Vol 2, No 2 (2019)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (475.91 KB) | DOI: 10.12928/irip.v2i2.1183

Abstract

The performance of the calcium chloride hexahydrate (CaCl2.6H2O) to store the sensible and latent heats is mainly determined by its nucleation or liquid to the solid phase transition. This is due to the barrier that has to be overcome when the material undergoes the nucleation process with a reduction in the entropy value. This material, with melting temperature around 29.8 °C, can be used as the thermal energy storage for building applications in tropical areas such as Indonesia, in order to reduce the electrical energy for aircond (AC) machines. In this paper, we report the results of an experimental study for the effect of the electrical field to the supercooling degree and time period for a phase transition. The variation in the magnitude of the electrical field was achieved by variation in the gap of the electrode for sharp end electrodes (cathode and anode), for the commonly sold copper electrode.
Development of a Schaum's Outline Series Module on Spin Angular Momentum for Physics Education Students: Feasibility Study and User Acceptance Oktova, Raden; Putri, Risky Afandi; Sukarelawan, Moh. Irma; Hidayah, Rihmah Alifah
Berkala Fisika Indonesia : Jurnal Ilmiah Fisika, Pembelajaran dan Aplikasinya Vol. 17 No. 1 (2026)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/bfi-jifpa.v17i1.31983

Abstract

Spin angular momentum is an abstract concept in quantum mechanics that often causes conceptual and mathematical difficulties for Physics Education students. The limited availability of specific teaching materials tailored to the characteristics of prospective teachers has prompted the need to develop structured and contextual modules. This study aims to develop a quantum mechanics module on spin angular momentum that is suitable and appropriate for undergraduate Physics Education students. This study uses the Research and Development (R&D) method with the ADDIE model limited to the Development stage. The research subjects consisted of two Physics Education lecturers as validators and eleven students who had taken the Quantum Mechanics course. The instruments were expert validation questionnaires and student acceptance questionnaires using a 4-point Likert scale, while the data were analyzed descriptively and quantitatively in the form of percentages. The expert validation results showed a very feasible category in terms of material (94.4%), usefulness (87.5%), presentation (85.7%), and language (75%), as well as a feasible category in terms of graphics (71.8%). The student acceptance test showed a very satisfied category in all aspects, with percentages ranging from 89.20% to 94.31%. Thus, the developed module was declared feasible and very well accepted as self-learning material, and has the potential to support the strengthening of students' conceptual understanding.
Co-Authors Ahmad Swandi Anggraeni, Radhiah annisa rahman Hidayah, Rihmah Alifah Inge M. Sutjahja Kurnia, Daniel Moh. Irma Sukarelawan Raden Oktova