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All Journal Jurnal Riset Bisnis dan Investasi International Journal of Research in Vocational Studies (IJRVOCAS) International Journal of Accounting and Management Information Systems
Yusi, Syahirman
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Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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The Comparison of Hydrogen Purity on Brown’s Gas Using Dry Cell Electrolyzer with/without Polyvinyl Alcohol (PVA) Separator Membrane Rahmadina, Nisa; Bow, Yohandri; Yusi, Syahirman
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 3 No. 2 (2023): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v3i2.205

Abstract

Global environmental issues that demand good air quality have encouraged various energy sources to develop environmentally friendly energy. Brown’s Gas is produced by using an electrolysis system to separate water into Hydrogen (H2) and Oxygen (O2) gas. The dry cell is an electrolyzer that is widely used for both small and large-scale hydrogen production systems. A dry cell electrolyzer was designed with 12 stages of 316 stainless steel with Polyvinyl Alcohol as a polymer membrane to prevent mixing H2 and O2 to get a high percentage of hydrogen purity. This study compares hydrogen purity on Brown’s gas using a dry cell electrolyzer with PVA with/without a PVA separator membrane. The result shows that the PVA membrane significantly impacted hydrogen purity. The hydrogen purity on Brown’s gas without PVA membrane for KOH, NaOH, KCl, and Seawater was 58.37%, 56.42 %, 50.16%, and 55.22 %. Compared to using the membrane was 78.32%, 77.80%, 63.16%, and 74.0 %, with the highest hydrogen obtained was KOH electrolyte.
The Relationship Between Entrepreneurial Spirits and Entrepreneurial Value in Improving Business Self-Reliance: A Proposed Model Yusi, Syahirman
Jurnal Riset Bisnis dan Investasi Vol 8 No 1 (2022): Jurnal Riset Bisnis dan Investasi
Publisher : Jurnal Riset Bisnis dan Investasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/jrbi.v8i1.3698

Abstract

Small and medium enterprises (SMEs) had an important role in the national economy, as the social economy, the SMEs played a role in absorbing employment, economic service, equity process, increasing income, economic growth, and national stability. Although in practice the development efforts have been carried out, in reality, these SMEs had not been fully free from problems or constraints faced. The objective of this study was to find out the relationship between entrepreneurial spirit, entrepreneurial value and business self-reliance. Primary data were obtained through answers to questionnaires from 250 respondents who were randomly assigned and processed through Structural Equation Modeling (SEM) analysis. The conclusion obtained was both entrepreneurial spirit and entrepreneurial value directly had positive effects on the business self-reliance. Through variables in the form of entrepreneurial behaviour, entrepreneurial spirit and entrepreneurial value also influenced positively. The results of the analysis provided explanations that all research hypotheses were acceptable.
IoT monitoring for PV system optimization in hospital environment application Andi, Kemas; Kusumanto, Raden; Yusi, Syahirman
International Journal of Accounting and Management Information Systems Vol. 2 No. 2 (2024): August
Publisher : Goodwood Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35912/ijamis.v2i2.3310

Abstract

Purpose: This study aims to implement an Internet of Things (IoT)-based monitoring system to optimize photovoltaic (PV) system performance and ensure uninterrupted power supply for critical medical equipment, specifically ventilators and monitors, in the ICU room of RSI Siti Khadijah Palembang. Methodology/approach: The system uses on-grid solar panels connected to an Arduino-based IoT monitoring platform. The IoT system receives inputs from current and voltage sensors, enabling real-time supervision of solar panel output, battery status, and inverter performance. Automatic Transfer Switch (ATS) technology ensures seamless switching between PV and utility sources during periods of insufficient solar energy. Results/findings: The installed system demonstrates stable daily performance, with peak energy production reaching up to 400 Wp under optimal conditions. Real-time data from the IoT dashboard enables informed decision-making to maintain power supply continuity in the ICU. Voltage levels remained within a safe range for ICU operations throughout the test period. Conclusion: IoT integration enhances the reliability of hospital-based PV systems. The system proved effective in maintaining continuous energy delivery to life-saving equipment, reducing reliance on conventional UPS systems. Limitations: The current system lacks MPPT (Maximum Power Point Tracking) and thermal regulation, which could further optimize energy conversion efficiency under varying weather conditions. Contribution: This study provides a replicable model of IoT-enhanced PV deployment in hospital settings, offering valuable insights for renewable energy applications in critical infrastructure across tropical developing countries.
Co-Authors Andi, Kemas Kusumanto, Raden Rahmadina, Nisa Yohandri Bow