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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) Jurnal Teknologi Reaktor Nuklir Tri Dasa Mega MEKANIKA - JURNAL TEKNIK MESIN Business and Finance Journal International Journal of Engineering Continuity
Hendro Tjahjono
Pusat Teknologi dan Keselamatan Reaktor Nuklir (PTKRN) Badan Tenaga Nuklir Nasional (BATAN)
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analisis Pengaruh Kepemimpinan dan Komunikasi Terhadap Motivasi dan Kinerja Pegawai (Satuan Polisi Pamong Praja Kota Surabaya) Rodhiyallah, Muhammad; Kusmaningtyas, Amiartuti; Tjahjono, Hendro
Jurnal Bisnis dan Keuangan Vol 2 No 1 (2017): March
Publisher : UNUSA Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33086/bfj.v2i1.467

Abstract

The aim of the study was to analyze and determine the influence of leadership and communication, on employee motivation and performance at Satuan Polisi Pamong Praja Kota Surabaya. Branch, as many as 100 persons. Sampling technique samples (Slovin) data was analyzed with multiple linear regression with SPSS for windows program. The result of the research indicated that leadership, communication, and motivation simultaneously have significant effect on employees’ performances with determination value of 0,424 or 4,24%. Leadership, communication and motivation partially has significant effect on performance. Communication itself has dominant effect on employee’s performance.
ANALISIS PENGARUH PUTARAN DAN DIAMETER TABUNG PUTAR TERHADAP KAPASITAS PENIRISAN PADA MESIN PENIRIS BAWANG GORENG Tjahjono, Hendro; Safa`at, Erwin
MEKANIKA: Jurnal Teknik Mesin Vol 4 No 01 (2018): July
Publisher : Program Studi Teknik Mesin, Universitas 17 Agustus 1945 Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (997.294 KB)

Abstract

Salah satu hasil pertanian di jawa timur yang unggul adalah bawang merah yang sangat melimpah. Pada era global saat ini bawang merah tidak hanya digunakan sebagai salah satu rempah olahan makanan, seiring berkembangnya dunia tataboga, bawang merah sekarang dijadikan sebagai olahan makanan bawang goreng. Dan seiring berkembangnya jaman banyak sekali produk mesin yang dapat membantu proses produksi, seperti mesin peniris bawang goreng. Dengan adanya mesin tersebut kebutuhan prosuksi setiap tahunnya akan meningkat dan keiginan untuk meningkatkan kinerja mesin akan muncul untuk menunjang kapasitas produksi yang baik.Penelitian ini bertujuan untuk mengkaji pengaruh diameter tabung putar dan kecepatan tabung putar terhadap kapasitas dan waktu penirisan mesin peniris bawang goreng. Variasi parameter menggunakan diameter tabung putar 260 mm , 280 mm , 300 mm dan kecepatan tabung putar 350 rpm , 400 rpm, 450 rpm .Dari penelitian di atas dapat di simpulkan bahwa semakin besar diameter tabung putar dan semakin cepat kecepatan tabung putar maka semakin bagus pula kapasitas penirisan mesin peniris bawang goreng tersebut. Hal ini terlihat pada kombinasi diameter 300 mm dengan kecepatan putar 450 rpm yang menghasilkan kapasitas penirisan 31,726 kg/jam sehingga disa dijadikan variasi parameter yang terbaik untuk kapasitas produksi .
Investigation of Natural Circulation Flow Under Steady-State Conditions Using a Rectangular Loop Roswandi, Iwan; Dimas, Dimas; Gunawan, Hyundianto Arif; Budiman, Arif Adtyas; Amelia, Almira Citra; Sanda, Sanda; Tjahjono, Hendro; Juarsa, Mulya
JURNAL TEKNOLOGI REAKTOR NUKLIR TRI DASA MEGA Vol 26, No 2 (2024): June 2024
Publisher : Pusat Teknologi Dan Keselamatan Reaktor Nuklir (PTKRN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/tdm.2024.7055

Abstract

Passive safety systems have garnered significant attention, particularly in situations where active systems fail. The comprehension of natural circulation phenomena plays a vital role in the advancement of passive cooling systems in nuclear power plants. The objective of this study is to examine the flow patterns under steady state conditions and assess the Grashof number. The experimental approach involved maintaining temperature differences of 60°C, 70°C, 80°C, and 90°C for a duration of 3 hours, with 3 replications. Alterations in temperature have an impact on the physical properties of water, such as density, viscosity, and specific heat. The calculations indicate that the minimum Grashof number occurs at 60°C (2.49×1012), while the maximum is observed at 90°C (9.42×1012), with an R2 value of 0.96533. Turbulent flow patterns were observed during each temperature fluctuation, which aligns with previous research on the Ress value of Grm/NG.
Implementation of adaptive PID control for maintaining temperature stability during steady-state conditions in stirred heating tank Valentina, Pricylia; Tjahjono, Hendro; Pamitran, Agus Sunjarianto; Roswandi, Iwan; Setiawan, Putut Hery; Budiman, Arif Adtyas; Haryanto, Dedy; Sanda, Sanda; Prayogo, Kukuh; Juarsa, Mulya
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 16, No 4: December 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v16.i4.pp2389-2399

Abstract

Temperature stability is a crucial factor in industries such as chemicals, pharmaceuticals, and food processing, where fluctuations can damage product quality and increase energy consumption. This study aims to optimize heater power control using an adaptive proportional integral derivative (PID) control system to maintain temperature stability under steady-state conditions. The method involves applying adaptive PID control to a stirred heating tank using LabVIEW software with a national instruments controller module and a single-phase SCR to regulate heater power and adjust control parameters in real time. The results indicate that the system operates more effectively under stable conditions, with faster response times and a lower overshoot of less than 0.12%. However, under disturbed conditions, such as water drainage and replacement, the system requires more time to adjust the temperature and experiences increased energy consumption and heat loss. Despite this, the system still achieves an energy efficiency improvement, with efficiency values ranging from 77.66% to 80.03%. The implementation of adaptive PID control demonstrates significant potential in enhancing system accuracy and response to temperature changes, contributing to the development of more efficient industrial control technologies.
Optimizing Heritage Power Distribution Using Zonal TM/TR-Package Systems Suparjo, Suparjo; Wardana Abyoto , R. Kun; Tjahjono, Hendro
International Journal of Engineering Continuity Vol. 5 No. 1 (2026): IJEC
Publisher : Sultan Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58291/ijec.v5i1.525

Abstract

Electrical power distribution in heritage conservation areas faces the dual challenge of meeting modern technical standards while adhering to strict preservation regulations. Traditional centralized low-voltage systems often result in critical voltage drops and power losses due to extended feeder lengths. This study proposes and evaluates an optimized Zonal TM/TR-Package distribution system as a solution. Using ETAP 22.5 software, a comparative load flow analysis was conducted on a 20-hectare government heritage complex comprising 21 protected buildings. The simulation results confirm that the proposed zonal configuration significantly outperforms the existing centralized system, reducing maximum voltage drops from 12.04% to 4.48% and decreasing total active power losses (I2R) by 47.6%, and improving system efficiency from 95.32% to 97.50%, ensuring full compliance with PUIL 2020 safety standards. Critically, the reliability assessment — evaluated using SAIDI and SAIFI indices — demonstrates a 37.44% improvement in SAIDI (from 9.27 to 5.80 hours/customer/year), while SAIFI remains stable at 0.77 interruptions/customer/year, confirming that zonal fault isolation substantially reduces outage duration without increasing interruption frequency. Furthermore, the modular design minimizes physical footprint, preserving the site’s aesthetic value. Beyond a case study, this research contributes to electrical engineering science by establishing a replicable technical framework for revitalizing heritage infrastructure, balancing efficient power delivery with architectural conservation.
Co-Authors Amelia, Almira Citra Amiartuti Kusmaningtyas Budiman, Arif Adtyas Dedy Haryanto Dimas, Dimas Gunawan, Hyundianto Arif Mulya Juarsa Pamitran, Agus Sunjarianto Prayogo, Kukuh Putut Hery Setiawan Rodhiyallah, Muhammad Roswandi, Iwan Safa`at, Erwin Sanda Sanda Suparjo Valentina, Pricylia Wardana Abyoto , R. Kun