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All Journal Jurnal Fisika Unand Faraday: Journal of Fundamental Physics, Research, and Applied Science
Allif Rosyidy Hilmi
Universitas Pembangunan Nasional "Veteran" Jawa Timur
Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Rooftop PV System Optimization in an Educational Building Using SAM: A Case Study at UPN Veteran Jawa Timur Yofinda Eka Setiawan; Allif Rosyidy Hilmi
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 2 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i2.17

Abstract

The implementation of sustanable energy in educational institutions recognizes the potential of rooftop photovoltaic (PV) systems as a viable energy source. This research aims to evaluate and optimize the design of a rooftop photovoltaic (PV) system for Building 1 of the Fakultas Teknik dan Sains (FTS) at Universitas Pembangunan Nasional "Veteran" Jawa Timur (UPNVJT) using the System Advisor Model (SAM) software. Integrated data including meteorological data, building characteristics, and solar panel system specifications were utilized. The available rooftop area for PV system installation is approximately 200 m² with a north-facing orientation, which is estimated to accommodate a 30 kWp PV system capacity. Tilt angle and azimuth scenarios were varied to achieve maximum energy production. Based on SAM simulations, the optimal installation angle of 15° tilt and azimuth generated an annual energy output of 44,052 kWh with a performance ratio of 71% and a capacity factor of 17%. This study confirms that rooftop PV installation at FTS UPNVJT is technically feasible, and it is expected to serve as a foundation for the gradual implementation of PV systems as part of green campus initiatives and energy transition in educational institutions.
Optical Band Gap of PMMA: Cody, ASF, and DASF Methods Compared to Tauc Allif Rosyidy Hilmi; Yofinda Eka Setiawan; Nailul Hasan
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 2 No. 1 (2026): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v2i1.57

Abstract

This study aimed to determine the optical band gap of polymethyl methacrylate (PMMA) using alternative methods to the conventional Tauc plot. PMMA was prepared by solution casting and characterized using UV–Vis spectroscopy. The optical band gap was approximated by applying the Cody, Absorption Spectrum Fitting (ASF), and Derivative ASF (DASF) methods, and the results were compared with those from the Tauc approach. The optical band gap values ranged from 3.10 eV to 4.94 eV, which fall within or near the range reported in the literature for PMMA, depending on the analysis method and transition model used. Each method had distinct advantages: the Cody method provided a clearer linear region for amorphous systems, ASF offered a practical approach that did not require sample-thickness information, and DASF enhanced precision through derivative-based analysis. The observation of band gap values corresponding to both direct and indirect optical transitions suggests the presence of multiple effective optical transition pathways in amorphous PMMA. These findings demonstrate that the Cody, ASF, and DASF methods can serve as reliable alternatives to the Tauc method for analyzing the optical properties of polymeric materials.
Analisis Struktur Hidroksiapatit Berbasis Cangkang Telur Ayam dengan Variasi Suhu Kalsinasi Ayunda Wulan Permatasari; Nailul Hasan; Nur Aini Fauziyah; Allif Rosyidy Hilmi
Jurnal Fisika Unand Vol 15 No 2 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.2.188-196.2026

Abstract

The purpose of this study is to understand how color changes occur during the calcination heating process at different temperatures in the formation of hydroxyapatite. The synthesis process began with the calcination of CaCO_3 to CaO at temperatures of 800°C, 900°C, and 1000°C for four hours, followed by the formation of hydroxyapatite thru the calcination process of eggshell samples at temperatures of 800°C and 1000°C for 3 hours. To determine the hydroxyapatite content in the sample, characterization was performed using XRD diffraction patterns to identify the phase. XRD analysis was conducted using match2 software. Morphological analysis of hydroxyapatite was performed using SEM characterization. The analysis results indicate that there are still impurities present at temperatures of 800-800°C. The higher the calcination temperature, the greater the purity of the resulting hydroxyapatite.
Co-Authors Ayunda Wulan Permatasari Nailul Hasan Nur Aini Fauziyah Yofinda Eka Setiawan