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ANALYSIS OF THE EFFECT OF LOAD VARIATIONS ON THE THERMAL EFFICIENCY OF THE MUARA KARANG PLTG GAS TURBINE Banjarnahor, Anugerah; Hendri; Muhammad Ridwan
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.10393

Abstract

Gas turbines are one type of power plant with high flexibility, but their performance is greatly affected by variations in operating load. This study aims to analyse the effect of load variations on the thermal efficiency of Gas Turbine Unit 1.2 at the Muara Karang Gas Power Plant under three load conditions, namely 70 MW, 80 MW, and 90 MW. Actual operational data was used to calculate component work (compressor, combustion chamber, and turbine) and cycle thermal efficiency using thermodynamic calculation methods based on the Brayton Cycle. The calculation results were validated using Cycle Tempo and EES (Engineering Equation Solver) software with an average deviation of <5%. The results show that thermal efficiency increases as the operating load increases. At a load of 70 MW, the thermal efficiency was recorded at 30.30%, increasing to 30.76% at a load of 80 MW, and reaching a peak of 31.72% at a load of 90 MW. These findings prove that gas turbines operate most efficiently at loads close to their maximum capacity, so that operating at optimal loads can reduce specific fuel consumption and improve the energy efficiency of the plant.
MILKU AL-YAMĪN: Diskursus dalam Al-Qur’an antara Teks dan Konteks Hendri; Arsal
AL ITQAN: Jurnal Studi Al-Qur'an Vol 11 No 2 (2025): Al ITQAN: Jurnal Studi Al-Qur'an
Publisher : STAI AL-ANWAR SARANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47454/alitqan.v11i2.1149

Abstract

The relationship between the text and its context in the term Milku Al-Yamīn is often understood differences and shifts in meaning from classical to contemporary times, which are inseparable from social factors and thus influence as a form of ownership of slaves or prisoners of war in pre-Islamic Arab society. However, this interpretation often causes debate when confronted with modern human values. This study uses a qualitative approach with a literature study and thematic interpretation (maudhū‘i) method, combined with socio-historical analysis and contextual hermeneutics. The results show that the textual understanding of Milku Al-Yamīn in the Qur'an cannot be separated from the social and cultural context of the society when the verses were revealed. The Qur'an does not directly legalize slavery, but takes an evolutionary path by emphasizing liberation, justice, and respect for human dignity. In the modern context, scholars believe that Milku Al-Yamīn needs to be reinterpreted as a symbol of social transformation towards the elimination of oppression and inequality. Thus, through a reading that takes into account both the text and context, Milku Al-Yamīn is understood not as a legitimization of slavery, but as part of the moral and humanitarian process promoted by the Qur'an.
The Influence of State Capital Participation and Capital Structure on Company Profitability with Company Size as a Moderating Variable : (Study on State-Owned Enterprises Assigned to Infrastructure Projects for the Period 2019-2023) Asih Pramulia; Endri Endri
Brilliant International Journal Of Management And Tourism Vol. 6 No. 1 (2026): Brilliant International Journal Of Management And Tourism
Publisher : Pusat Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/bijmt.v6i1.6819

Abstract

This research is motivated by the large allocation of State Capital Participation (PMN) to State-Owned Enterprises (SOEs) for infrastructure projects, which has not been fully accompanied by increased company profitability. Fluctuating financial performance, high debt burdens, and issues of inefficient state fund management necessitate an empirical study of the effect of PMN and capital structure on profitability, considering company size as a moderating variable. This study aims to analyze the influence of State Capital Participation (PMN) and Capital Structue on the Profitability of State-Owned Enterprises (SOEs) assigned to infrastructure projects, with Company Size as a moderating variable. The research was conducted on SOEs during the 2019–2023 period using a quantitative approach with panel data regression analysis. The data analysis employed the EViews 10.0 application using multiple regression and moderation tests to examine the role of company size in moderating the relationship between independent variables and company profitability. The results indicate that State Capital Participation positively influences profitability, while Capital Structure (measured by the Debt to Equity Ratio) has a significant negative impact. Additionally, Company Size acts as a moderating variable that strengthens the relationship between PMN and profitability but does not significantly moderate the effect of Capital Structure on profitability. This research is expected to provide insights for the government and SOE management in optimizing capital allocation and managing capital structure to enhance company profitability.
ANALYSIS OF THE IMPACT OF BEFORE AND AFTER OVERHAUL ON THE THERMAL EFFICIENCY OF THE MUARA KARANG PLTG GAS TURBINE USING A SANKEY DIAGRAM Banjarnahor, Anugerah; Ridwan , Muhammad; Hendri
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.10394

Abstract

Gas turbine performance gradually degrades due to fouling, thermal stress, and component wear, leading to a reduction in thermal efficiency. Major overhaul is essential to restore performance close to design conditions. This study analyzes the impact of major overhaul on the thermal efficiency of Gas Turbine Unit 1.2 at Muara Karang Power Plant, focusing on maximum load operation at 90 MW. Actual operational data were processed using Brayton cycle thermodynamic principles to calculate net work output, fuel energy input, and overall thermal efficiency. Calculations were validated with Cycle Tempo and Engineering Equation Solver (EES), showing a deviation within 5%. Energy distribution and losses were visualized using Sankey diagrams to compare before and after overhaul conditions. Results indicate that thermal efficiency increased from 31.91% to 32.41% after overhaul, corresponding to a reduction in heat loss of approximately 2,950 kJ/s. The improvements were mainly associated with compressor recovery and reduced irreversibility in the combustor. These findings demonstrate that major overhaul is an effective maintenance strategy to improve thermal performance, while Sankey diagrams provide valuable insights into component-level energy losses for operational and maintenance decision-making.
Determinants of Successful Crew Recruitment in Shipping Companies Neng Sri Komala Komala; Muhammad Thamrin; Prasadja Ricardianto; Endri Endri; Edi Abdurahman
Annals of Human Resource Management Research Vol. 6 No. 1 (2026): March
Publisher : Goodwood Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35912/ahrmr.v6i1.3431

Abstract

Purpose: This study aims to examine and analyze the effects of training, work experience, education, and personal characteristics on ship crew recruitment success in Indonesian shipping companies, with competence and work experience as mediating and moderating variables, respectively. Methodology: A quantitative explanatory research design was employed. The population consisted of HR division employees at various levels in shipping companies in Indonesia. The sample size was determined using the Slovin formula and selected through proportional random sampling method. Data were collected using structured questionnaires with a five-point Likert scale and were supported by focus group discussions (FGDs). SEM-PLS was used for the data analysis. Results: Training, education, and personal characteristics positively and significantly affected the competence and recruitment success. Competence also positively influenced recruitment success and mediated the effects of training, education, and personal characteristics on recruitment success. Additionally, work experience strengthens the relationship between competence and recruitment success, confirming its moderating role. Conclusions: This study highlights the importance of competence in improving recruitment outcomes in maritime HR practices. It also emphasizes that training, education, and personal characteristics enhance competence, which, in turn, affects recruitment success. Work experience plays a key role in strengthening this relationship. Limitations: The study is limited to HR personnel in Indonesian shipping companies, with a small sample size, affecting generalizability. External factors, such as maritime regulations and digital recruitment technologies, were not considered. Contributions: This study contributes to maritime HR management by developing a model of crew recruitment success, incorporating competence and work experience, and providing a comprehensive understanding of recruitment effectiveness in shipping companies.
Co-Authors - Mifbakhudin Abdul Haris Abdul Haris Abdul Harris Abdul Harris Abdul Rahman Abdul Rahmat Abdul Wakil Abdurrahman Misno Achmad Firdaus Achmad Maulana Adi Nurmahdi Af Amul Khair Afdhi Nugraha Siregar Afria Nanda Syafitri Nur Afrizal Adjie Nugroho Agung, Jumatul Agus Nugroho agus Nugroho Agus Wijayanto Agustian, Anugrah Tri Agustina Kurniasih Agustini, Silvia Rianti Ahmad Jauhar Fuad Ahmadi, Alpan Akbar Aldino Wijaya Akhmad Zulkifli Alamin, Fathul Alfajri, Alfajri Alfian Jhonatan Alghifari, Muhammad Almadison Alpan Ahmadi Alvia Santoni Alvito Dian Deva Ameliah, Siska Amik Nadziroh Amirul Mukminin Amirullah -, Amirullah Ana Susanti Ananda Ananda Ananda Andam Dewi Andini, Aulia Andriani, Salis Anisa Vionita Anla Pater, Rizki Annisa Ristiana Annisa, Qhaerun Anrinal Ap, Aris Toteless Apollo Apollo Appolo Appolo Arfiana Burhan, R Dina Ari Widiyanti, Ari Arief, Rudi Kurniawan Arif, Ratna Arsal Asih Pramulia Asrul Aswinanta Dongoran Aswardi Asyifa, Ninette I. Augustina Kurniasih Ayu Efritadewi Azwar Azwar Azwar Azwar Bambang Santoso Marsoem Banjarnahor, Anugerah Barus, Lidiya Anggreny Br Bella Tahya Hania Beni Irawan Beni Irawan Budi Yanto, Budi Busyro Chairani, Rifda Chandra Chika Islah Hani, Ripsyah Christina Dahyul Dana Santoso Saroso Darlisma Darlius Darlius Darojat, Khumaidah Darul Ilmi david Dede Fadhillah Despita Meisak Devi Nadya Dea Dewi Haryanti Dewi, Selpa Dian Mustika Intan Dimas Bima Saputra Dwi Tiffany Alyschiara, Laras Dwi Verasasti Tarihoran Dwiranti, Febriza Edhie Budi Setiawan, Edhie Budi Edi Edi Abdurahman Edi Surya Negara Effyaldi Eki Darmawan Eki Darmawan Elfiani Elfira Riani Syamsu Elvina, Amanda Emmy Mudiarti Emril, Nofriyan Eri Marlapa Ernita, Lina Erpidawati, Erpidawati Fachruddin Fachry Abda El Rahman Fadhila Dhia Malihah Fadhillah, Alfan Qais Fadhli, Tri Fadillah, Muhammad Fadlan Rusdana Fadly Azhar Faturrahman Wali Febri Nuraini, Putri Febrinda Lumbantobing Feliks Feriani Astuti Tarigan Feriani Astuti Tarigan Firman Jofani Firmansyah Firdaus Fitra Galih Prasetyo Gampo Heryono Grestia Laurensa Gulo, Septi Puspitaria Gunardi Gusmulyani Hadi Aldo Hafnil, Jon Haidar Ali Hananto, Bernad Hanum, Atiikah Hartoyo Harun Harun, Mohd Taufik Haryanti, Amelia Hazami, Baehaki Helga Yermadona Helly Ampera Hendri Hendri Heni Susanti, Heni Heni Widiyani Henny Ritha Herman Hesti Hasanah Husein, Destyanah Hutagaol, Ramses Ibnu Sani Wijaya Ihwani, Nurul Imelda Yose Indra Indra Indriani, Lita Inge Hutagalung Intan Permata IQBAL BAFADAL Irfan Harmain Irfan Setyo Nugroho Irfan Syauqi Beik Irwandi Syahputra, Irwandi Isjoni Isjoni Ismail ISMAIL SALEH Iswanti, Rini Jackri Hendrik Jamila Jannah Nurul Jannah, Nurul Jeans Tanu Johni Paul Karolus Jonathan Christopher Wiliem Junaidi Junaidi Kaloko, Ilhamda Fattah Karmilia, Rise Karnawi Kamar, Karnawi Kasman Ediputra Kasmanto Rinaldi, Kasmanto Kende, Henoch Kholis, Alfin Kurnia, Heri Kurniabudi Kurniawan Prasetyo Lailatul Leni Hartati Leony Hoki Lestari, Dwi Indah Lies Aryani Lola Astrid Yorita Lubis, Romadhon M. Aqshal Al Fachrizy M. RIZA Makdin, Hoirol Anuar bin Marnia, Rani Masindu Masrul Maulidah, Maulidah Meisak, Despita Melki Julianti Merisa Mery Mira Saudina Misno, Abdurrahman Miswardi Mitra Mourren Yang, Louis Mudori Muh. Nasir Muh. Sabir Maidin Muh.Yusuf Muhammad Arif Muhammad Fajar Hidayat, Muhammad Fajar Muhammad Hamdan Aninulyaqin Muhammad Najib Muhammad Ridwan Muhammad Thamrin Mukhamad Yasid Mulia, Putra Munthe, Yesyurun Murtafi'ah, Wahidatul Murtafi’ah, Wahidatul Musa, M. Musfiati Muspawi, Muhammad Mustafa Lutfi Mutia Rahayu Mutia Wahyuningsih Mutmainnah Muchtar Muzakir, Ari Muzakir Nahusona, Erick Suprianto Nasir Nasir Nasir Nasrul Na’ali, Basri Nelson, Alden Neng Sri Komala Komala Nisa, Afdilla Nofrizal Nofrizal Nora Nst, Elfi Novianti Novianti Nugraha, Yudhisthira Arya Nur Nugrahani Setiawati Nurafria Nanda Nuraini, Lia Nuriyah, Aminah Nurlaili, Lili Nurmalasari Nurmalasari Nurwijayanti Octara Pribadi Octavia, Octavia Parozak, M. Rudi Gunawan Paselle, Enos Pengky, Pengky Pery Rehendra Sucipta Pono, Wahyudi Sayuti Pramana Putra, Nanda Pramesty, Natasha Prasadja Ricardianto Prasadja Ricardianto, Prasadja Puji Hadiyati Putri, Hamelya Putri, Herlina Yani Putri, Silvia Adi Rachmad Ardhianto Ganjar Samudro Raelyn Notriyani Rahma Dalimunte, Siti Rahmadini, Nadia Putri Rahman, Ripatullah Rahmiati Ramadhan, Rio Randi, Muhammad Revhan Sakti Pratama Rian Kurniawan Rianti Agustini, Silvia Ridwan , Muhammad Rise Karmilia Riski Mai Candra Riskio Riskio Ristiana, Annisa Ritha, Henny Rizki Maulana Robby Mukhtar Rosita, Fadma Rut Dea Rosiana Silalahi Saeful Anwar Saeful Anwar, Saeful Saiful Anwar Saiful Anwar Saiful Anwar SAIFUL ANWAR Salwa Fadillah Haya Salwa Fadillah Haya Sari Dewi, Tike Murti Sari Wulandari Sari, Nila Permata Sarimuddin, Sarimuddin Sayono Sayono Sebastian Alboen Sihombing Sembiring, Honny Fiva Akira Seruyanti, Natali Shafra Shella Rachmawaty Shofiyatul Muthi'ah Siahaan, Agus Maringan Sigid Eko Pramono Sigid Eko Pramono Sihombing, Sebastian Alboen Silvia Rianti Sindi Aulia Singgih Berlan Kosasi Siska Amelya Siti Situmeang, Nova Sofyan Sonny Zulhuda Sri Agustina Lisa Sri Utaminingsih Sudirman Suharto Abdul Majid Supriadi Suryadi Suryadi Suryati, Lina Sutariya, Muhammad Faridan Suwandi, Edvan Syamsyida Rozi Syarif Hasyim Tamar Tamaruddin Tammardhia, Rodhia Tan Le Xuan Tarihoran, Dwi Verasasti Tata Sutabri Teresia Titania Natasia Ginting The, Elizabeth Theresia Mentari Tiara Atika Tike Murti Sari Dewi Tine Yuliantini Utami, Ichwani Siti Victoria Lucky Violanda Rizqi Wadi, Fajrul Wahidatul Murtafi’ah Wan Dian Safina Wardhana, Muhammad Irfan William, Stevan Abraham Willy Arafah, Willy Windi Mayani Dalimunthe Wiwik Utami Wulan, Nadia Agustin Nawang Yahya Yan Kristian Halomoan Yolanda, Imel Yorita Astri, Lola Yosi Pahala, Yosi Yosita, Disna Yulia Riza Yumna Nuhashofa, Salma Daarin Yusnaweti Yusrina, Afifah Zaenal Abidin Zaerofi, Afif Zakaria, Maman Zakia Rahman, Agil Zakir, Supratman Zidane Zulaifi, Reza Zulfani Sesmiarni Zulfikar, Fahmi Zulkifli Zulkifli Zulnan Tinggi Hari