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All Journal Jurnal Teknologi Reaktor Nuklir Tri Dasa Mega Time in Physics: Journal for Theoretical, Instrumentation, Material-Molecular, and Education Physics JURNAL ECONETICA: Jurnal Sosial, Ekonomi Dan Bisnis
Januar Akbar
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Economics, Econometrics & Finance Education Energy Materials Science & Nanotechnology Mathematics Physics Social Sciences

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Efek Perubahan Sudut Kemiringan Terhadap Perpindahan Kalor dan Laju Aliran Air pada Untai Sirkulasi Alamiah Yogi Sirodz Gaos; Mulya Juarsa; Edi Marzuki; Januar Akbar
JURNAL TEKNOLOGI REAKTOR NUKLIR TRI DASA MEGA Vol 14, No 1 (2012): Pebruari 2012
Publisher : Pusat Teknologi Dan Keselamatan Reaktor Nuklir (PTKRN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (262.635 KB)

Abstract

Pelajaran dari kasus kecelakaan PLTN Fukushima menunjukkan gagalnya sistem aktif, sehingga pengoptimalisasian sistem pasif menjadi suatu keharusan. Sistem pasif menerapkan hukum alamiah, dalam hal ini fenomena sirkulasi alamiah. Efisiensi sirkulasi alamiah dilakukan dengan mengidentifikasi nilai rugi kalor menggunakan Untai Simulasi Sirkulasi Alamiah (USSA-FT02). Analisis dilakukan untuk mengetahui pengaruh nilai pemindahan kalor oleh air terhadap nilai rugi kalor yang terjadi pada sistem aliran tertutup dengan adanya distribusi kalor pada fluida kerja (air) . Komponen USSA FT- 02 terdiri atas pipa SS316 berdiameter 1 inchi, pre-heater, heater dan cooler. Variasi eksperimen adalah beda ketinggian antara sisi panas dan sisi dingin dengan mengubah sudut kemiringan loop, yaitu pada sudut 0o, 45o dan 90o. Temperatur outlet heater dan temperatur inlet cooler digunakan sebagai parameter yang diukur dan direkam dengan rentang waktu eksperimen selama 45 menit. Hasil eksperimen dan analisis berdasarkan perbedaan sudut kemiringan 0o, 45o dan 90o secara berturut-turut untuk laju aliran massa air meningkat, diperoleh rugi kalor tertinggi sepanjang pipa dari oulet heater ke inlet cooler menurun dari 12,3 W hingga 3,4 W seiring kenaikan sudut kemiringan. Kemudian persentase pemindahan kalor rata-rata yang diterima air pada bagian heater berdasarkan kenaikan sudut kemiringan secara berturut-turut meningkat dari 49,3%, 52,5% dan 55,7%.
Evaluation Study of Power Requirements Planning in Electrical Installations in the Construction of the Pagedangan Tangerang Overpass Bridge Akbar, Januar; Ramza, Harry; Machdi, Agustini Rodiah; Sofwan, Agus
TIME in Physics Vol. 2 No. 2 (2024): September
Publisher : Universitas Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/timeinphys.2024.v2i2p111-117

Abstract

The Pagedangan Tangerang Overpass Bridge is one of the transportation infrastructure in the Tangerang area. The installed electrical loads include lighting loads (lamps) and power loads (which of course require a fairly large electrical power supply. The electrical power installed on the Pagedangan Overpass Bridge is 20,300 W. The power supplied from PLN is 33,000 VA from PLN and the total power capacity of the transformer is 37,500 VA. The results of the drop voltage analysis calculation for the PJU lighting load are 5,530 VA. For the analysis results of the drop voltage of 2.00 V, the voltage drop percentage is 0.42% and the conductor power loss is 12.12 W, the power loss percentage is 0.27%.
Analisis Empiris Transformasi Dig Pengaruh Kualitas Layanan, Kepercayaan, dan Kemudahan Aplikasi terhadap Loyalitas Pengguna Mobile Banking pada Bank Daerah Akbar, Januar; Jamilah, Siti; Muhaedi, Muhaedi
JURNAL ECONETICA: Jurnal Sosial, Ekonomi, dan Bisnis Vol. 7 No. 2 (2025): November 2025
Publisher : Program Studi Ekonomi Islam Fakultas Ekonomi Universitas Nahdlatul Ulama Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69503/w76h1912

Abstract

This study aims to analyze the influence of service quality, trust, and ease of use on mobile banking user loyalty at a regional bank. The background of this study is based on the increasing role of digital services in the banking industry and the importance of user loyalty as an indicator of service success. This study used a quantitative approach with an explanatory research method. Data were collected through questionnaires distributed to 150 respondents who were active mobile banking users at regional banks using a purposive sampling technique. Data analysis was performed using multiple linear regression after undergoing validity, reliability, and classical assumption tests. The results showed that service quality, trust, and ease of use of the application had a positive and significant influence on user loyalty, both partially and simultaneously. Service quality was the most dominant factor influencing loyalty, followed by trust and ease of use. These findings suggest that improving service quality, including speed, security, and responsiveness, as well as strengthening trust and ease of use of the application, can significantly increase mobile banking user loyalty. This study provides a theoretical contribution to the development of literature related to user behavior of digital banking services and provides practical implications for regional banks in designing strategies to improve service quality. By managing these three key factors in an integrated manner, regional banks can sustainably increase user satisfaction and loyalty.
Co-Authors Agustini Rodiah Machdi Edi Marzuki Muhaedi, Muhaedi Mulya Juarsa Ramza, Harry Siti Jamilah Sofwan, Agus Yogi Sirodz Gaos