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All Journal Jurnal Reviu Akuntansi dan Keuangan JURNAL ECONOMIA Jurnal Akuntansi & Auditing Indonesia Jurnal Energi Dan Manufaktur International Journal of Renewable Energy Development Jurnal Bisnis dan Manajemen Jurnal Keuangan dan Perbankan Rekayasa Mesin Jurnal Akuntansi Multiparadigma ROTOR: JURNAL ILMIAH TEKNIK MESIN International Conferences SDGs 2030 Challenges and Solutions JCES (Journal of Character Education Society) SENTIA 2016 Conference on Innovation and Application of Science and Technology (CIASTECH) JASa (Jurnal Akuntansi, Audit dan Sistem Informasi Akuntansi) ASEAN Journal of Chemical Engineering The Indonesian Journal of Accounting Research Scientific Journal of Mechanical Engineering Kinematika Indonesian Journal of Electrical Engineering and Computer Science TECHNO-SOCIO EKONOMIKA International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Prosiding SNPBS (Seminar Nasional Pendidikan Biologi dan Saintek) Journal of Accounting Research, Organization and Economics (JAROE) Eduvest - Journal of Universal Studies Jurnal Akuntansi Manado (JAIM) International Journal of Renewable Energy Development
Nurkholis Hamidi
Departement Of Mechanical Engineering Brawijaya University, Malang
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry 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 Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Neuroscience Social Sciences Other

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Performance of low cost sensor temperature logger in double jacket reactor vacuum distillation Djoko Wahyudi; Wignyanto Wignyanto; Yusuf Hendrawan; Nurkholis Hamidi
Indonesian Journal of Electrical Engineering and Computer Science Vol 33, No 3: March 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v33.i3.pp1424-1435

Abstract

Heat transfer occurs due to the difference in temperature between the system and its surroundings. The effect of temperature can affect various aspects of the refining process, including efficiency, selectivity, reaction kinetics, and the quality of the final product. This study aims to analyze heat transfer in a double-jacket reactor by measuring temperature data taken using a temperature data logger system. Prototype low cost-effective temperature monitoring for double jacket reactor vacuum is this system integrates an Arduino Mega 2560, a type K thermocouple, amplifier MAX 6675 module, and an SD card data logger to measure and record reactor temperature for 30 minutes. The temperature data obtained is used to calculate the heat transfer and analyze the heat transfer characteristics of the reactor. Heat transfer analysis based on measured temperature data is able to provide insight into the characteristics of heat transfer in the observed system and can identify hot spots and heat transfer energy in the system. Thus, the temperature data logger used in the double jacket reactor in the vacuum distillation system can produce accurate data and information, and this system has broad application potential in temperature monitoring in various fields.
Peran Unsur Meta-Utaut, Penerimaan Paylater dan Persepsi Penggunaan Terhadap Antropomofisme Indonesia NadaFajar Nurmani'ah Widiarti; Nurkholis Nurkholis; Lilik Purwanti
Jurnal Reviu Akuntansi dan Keuangan Vol. 14 No. 1 (2024): Jurnal Reviu Akuntansi dan Keuangan
Publisher : Universitas Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jrak.v14i1.30186

Abstract

Purpose: Applying the integration of UTAUT and MTAM theories, this study investigates the acceptance and usage of paylater from the Indonesian anthropomorphism perspective. Methodology/approach: Quantitative research strategy using methods for gathering data via questionnaires. Using the Lameshow formula, which yields 384.16, the sample size was calculated and rounded to 400 individuals. The combined strategy of the SEM-ANN method is used in this study's data analysis. Findings: The research presented here demonstrates that behavioral intentions are mostly determined by their performance expectations. The elements of effort expectancy, social influence, facilitating condition, hedonic motivation, habit, and trust in shaping user behavioral intentions all support this. However, perceived risk and perceived cost have the effect of decreasing behavioral intention to use. One of the things that encourages usage behavior is its goal. Practical implications: This empirical study breaks out the paylater adoption-influencing aspects from an Indonesian social perspective. IT developers can create user-friendly or widely approved paylater applications in this approach. Originality/value: This study builds pricing value components by combining the UTAUT and MTAM methodologies with structural equation modeling (SEM) and analysis of neural network (ANN) techniques. In recognizing connections that are linear and non-linear. 
ANALISIS KARAKTERISTIK SUDUT PENYEMPROTAN BIODIESEL PALM OIL MELALUI PENAMBAHAN VARIASI KONSENTRASI METANOL Suryaningrat, Muhammad; Sasongko, Mega Nur; Hamidi, Nurkholis; Saputro, Nurhadi
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1211

Abstract

This study aims to determine the effect of adding methanol as an additive to biodiesel to the spray angle on the diesel fuel injector. The material used in this study was palm oil biodiesel and added methanol with a concentration variation of 5%; 10%; 15%; 20% and 25% of the volume of the mixture (500 mL). The first step is mixing methanol and biodiesel according to the variables (B100; B100M5; B100M10; B100M15; B100M20 and B100M25). Next, the mixture is injected into the simulation of the combustion chamber through the injector nozzle, then the fuel that enters the simulation of the combustion chamber is recorded with a high-speed camera so that an image of the spray angle is obtained. Based on the method that has been carried out, it is found that the addition of variations in the concentration of methanol has an effect on the fuel spray angle. The higher the concentration of methanol added to biodiesel, the greater the spray angle of the fuel mixture. Spray angle for B100; B100M5; B100M10; B100M15; B100M20 and B100M25 are 7.5018o; 10.4018o; 11.8462o; 13.6052o; 14.0148o; and 14.6206o, approximately. This is because with the addition of methanol with higher levels, the mass of oxygen gas will be even greater. The greater the mass of oxygen in the fuel, the easier it is for the fuel to burn.
PYROLYSIS OF CORN COB BIOMASS TOWARD GASEOUS PRODUCTS ON SMALL CAPACITY REACTOR Yuliansyah, Fisal; Hamidi, Nurkholis; Sasongko, Mega Nur
International Journal of Mechanical Engineering Technologies and Applications Vol. 5 No. 1 (2024)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2024.005.01.9

Abstract

Corn waste is the result of agricultural production that can be further utilized and get additional economic for the community. Waste Corn cab is one of Indonesia abundant biomass apart from. The utilization of biomass by implementing pyrolysis process can be viable solution. This study aims to observe the determination corn cab pyrolysis using HCL-bentonite activation and without bentonite towards syngas product (CH4-H2-CO-CO2). Updraft reactor was utilized for 30 minutes pyrolysis process. We used MQ4, MQ8, MQ7 coupled with Arduino UNO for measuring CH4, H2, CO2 and CO in ppm unit. Compared without bentonite, the result showed that methane (CH4) gas production increased. In addition, we found also that hydrogen (H2) gas increased respectively. Not mention, the content of CO increased.
THERMOGRAVIMETRIC ANALYSIS OF PULVERIZED RICE HUSK WASTE CATALYTIC COMBUSTION WITH NATURAL ZEOLIT Hamidi, Nurkholis; Yuliati, Lilis; Purnami, Purnami; Faiz, Naufal Muhammad
International Journal of Mechanical Engineering Technologies and Applications Vol. 5 No. 2 (2024)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2024.005.02.7

Abstract

Rice husk is a type of agricultural waste that generated from rice production activities. The number continues to increase in line with the increasing food needs of the people in Indonesia. This study aims to determine the effect of the addition of natural zeolite as a catalyst and to determine the effect of natural zeolite mass percentage variation in the mixture on rice husk waste catalytic combustion by using the thermo gravimetric analysis method. The results of this study show that there is an effect of adding natural zeolite catalysts with the mass percentage of natural zeolite variations on the combustion characteristics and activation energy of each mixture. Increasing the mass percentage of natural zeolite catalysts can affect the reaction process become faster and minimize the effort required, but it was found that if the amount of natural zeolite catalyst is too much, it only adds to the heating load which causes slower reaction. The mixture of rice husks with 10% natural zeolite catalyst is the most optimal mixture because it has the lowest required activation energy value and the combustion reaction phases are achieved at a lower temperature than 5% and 15% mass percentage variations.
Power Dynamics in Accounting-Related Strategic Decision-Making within Hospital Management: A Narrative Literature Review Nurkholis Nurkholis; Endang Mardiati; Nurul Fachriyah; Made Aristia Prayudi
Jurnal Akuntansi Manado (JAIM) Volume 5. Nomor 1. April 2024
Publisher : Fakultas Ekonomi Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53682/jaim.vi.8827

Abstract

This paper aims to explore how power dynamics shape strategic decisions and performance measurement systems in hospital management, elucidating their impact on managerial choices in healthcare settings. Key themes and factors related to power dynamics in hospitals are identified, including the distribution of power among management teams, the influence of individual and group power dynamics, and the effects of power on decision-making across organizational levels. By synthesizing insights from previous research, this paper informs the development of theoretical frameworks and methodological approaches for studying the interplay between power dynamics and strategic decision-making in hospital management. Furthermore, it offers practical implications for hospital administrators and managers, providing guidance on navigating power dynamics to enhance decision-making effectiveness and organizational performance. This paper contributes to advancing our understanding of the complex dynamics of power and decision-making in hospital management, offering valuable insights for both research and practice in healthcare administration.
Combustion Characteristics of A Wood Pellet Made of Albizia Chinensis and Rice Husk Yuliati, Lilis; Hamidi, Nurkholis; Pragiwaka, Rafif Ezrha
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 1 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.01.8

Abstract

To reduce dependence on fossil fuel, biomass, e.g. the wood pellet, has been developed in recent years.  Indonesia has an abundant source of biomass, e.g. wood and rice husk. This work investigates the combustion characteristics of the wood pellet made of Albizia Chinensis and rice husk. The analyzed combustion properties are ignition delay time, the mass of residue, combustion duration, combustion rate, maximum flame temperature, During the experiment, the rice husk content varies between 0 to 50%. As the rice husk content increases from 0 to 50%, the ignition delay time increases from 6 to 9.9 seconds, the mass of residue increases from 21.2 to 45 % and the combustion rate decreases from 0.55 to 0.52 g/min. In addition, higher rice husk content also decreases the maximum temperature.
Study of Thermal Behavior in Mixed Scrap Tires (ST) And Polypropylene (PP) Plastic Using Thermogravimetry Analysis (TGA) and Differential Scanning Calorimetry (DSC) Sofana, Ilyas; Wijayanti, Widya; Hamidi, Nurkholis
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.7

Abstract

The world's rapid population growth, technological progress, and industrialization lead to an increase in fossil energy demand such as oil, coal, and natural gas. It is feared that this could lead to a scarcity of fossil energy in the future, therefore the use of alternative energy must be considered. One interesting concept to develop is waste to energy by utilizing plastic waste and also tires on vehicles. This is very possible because the two wastes contain elements of hydrocarbons which are also contained in fossil fuels so they can be processed to become alternative energy which can simultaneously reduce the population of the waste due to the increase in the world's population. This study aims to investigate the thermal behavior of scrap tires (ST) and polypropylene (PP) plastic using thermogravimetry analysis (TGA) and differential scanning calorimetry (DSC). TGA thermogram showed that the feedstock samples were degraded in the temperature range of 331,97 oC to 448,08 oC. The interpretation of the DSC thermogram that showing information about the glass transition point and the melting point of the feedstock polymer will also be presented in this study.
SPATIAL AND TEMPORAL POTENTIAL OF CURRENT ENERGY AND WAVE HEIGHT IN INDONESIAN SEA Alamsah, Azwar; Wahjudi, Ari; Moon, Park Jae; Hamidi, Nurkholis; Widhiyanuriyawan, Denny
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 2 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.02.8

Abstract

The energy demand in Indonesia continues to rise, with a primary reliance on fossil fuels, leading to environmental issues such as increased CO2 emissions. To address these challenges, the exploration of renewable energy, particularly from wave and ocean current sources, becomes crucial. This research analyzes the energy potential generated from waves and ocean currents throughout Indonesia using the WAVEWATCH-III method for modeling marine data over a 10-year period. The results indicate that the energy potential from ocean currents ranges between 120-150 kW, with strategic locations around straits such as the Makassar Strait and the Java Sea. Meanwhile, the potential energy from ocean waves reaches approximately 2.5 GW over a three-month period, thanks to Indonesia's extensive coastline of 99,093 km. Spatial and temporal analyses reveal significant variations in Sea Level Anomaly (SLA) values, which can be utilized for the development of renewable energy projects. The conclusion of this research emphasizes the need for a deeper understanding of the dynamics of ocean currents and waves to maximize the utilization of renewable energy potential in Indonesia.
Potensi Energi Arus dan Tinggi Gelombang Laut Indonesia Berdasarkan Data Penginderaan Jauh Alamsah, Azwar; Wahjudi, Ari; Moon, Park Jae; Hamidi, Nurkholis; Widhiyanuriyawan, Denny
TECHNO-SOCIO EKONOMIKA Vol 18 No 1 (2025): Jurnal Techno-Socio Ekonomika - April
Publisher : LPPM Universitas Sangga Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32897/techno.2025.18.1.4087

Abstract

Indonesia's energy demand continues to increase, with a primary reliance on fossil fuels that contribute to environmental issues, such as rising CO₂ emissions. To address this challenge, this study explores the potential of renewable energy from wave and ocean current sources. The research process analyzes the energy potential generated from waves and ocean currents across Indonesian waters using the WAVEWATCH-III method to model ocean data over a 10-year period, focusing on energy potential at strategic locations in Indonesian waters. The results show that the energy potential from ocean currents ranges between 120–150 kW, with strategic locations around straits, such as the Makassar Strait and the Java Sea. Meanwhile, the wave energy potential reaches approximately 2.5 GW over a three-month period, thanks to Indonesia’s extensive coastline of 99,093 km. Spatial and temporal analyses reveal significant variations in Sea Level Anomaly (SLA) values, which can be utilized for the development of renewable energy projects. The conclusion of this study emphasizes the need for a deeper understanding of ocean current and wave dynamics to maximize the utilization of renewable energy potential in Indonesia. Spatial and temporal analyses show significant variations in SLA values across Indonesia, reflecting the dynamics of ocean currents. Understanding these changes is crucial for planning adaptive ocean current energy projects, and seasonal trend analysis can help optimize the use of ocean current patterns.
Co-Authors A.A. Ketut Agung Cahyawan W Abdul Ghofar Adestya Bismandoko Haryantono Putra Akhlis Rizza, Muhammad Alamsah, Azwar Alfonsus Jantong Amanah Hijriah Ana Pratiwi ANGGI FIRMANSYAH Anindito Purnowidodo Ari Wahjudi Aries Boedi Setiawan Aris Kurniawan Aris Subagiyo Astrada Astrada, Astrada Bambang Subroto Candra Trimandoko, Candra Dadang Hermawan Dedy Nataniel Ully Denny Widhiyanuriyawan Dian Dinanti Djoko Wahyudi Djoko Wahyudi Eko Ganis Sukoharsono Eko Siswanto Endang Mardiati Erwin Saraswati Faiz, Naufal Muhammad Farid Majedi Farid Majedi, Farid Fauzan Baananto Fransisca Gayuh Utami Dewi Fransiska Iing Mariandini Gatot Soebiyakto Gugus Irianto Gunawan Prayitno Habibulfalah, Endi Hadi Saroso Hadi Saroso Handono Sasmito I Nyoman Gede Wardana I.N.G. Wardana I.N.G. Wardana I.N.G. Wardana I.N.G. Wardana I.N.G. Wardana I.N.G.Wardana I.N.G.Wardana Ibadurrohman, Ibrahim Ahmad Ilyas Sofana ING Wardana Kusumaningsih, Haslinda Lilik Purwanti Lilis Yuliati Lilis Yuliati Made Aristia Prayudi Marali, Aryati Muhaymin Maulana , Syahrizal Mega Nur Sasongko Moch. Syamsul Ma'arif Moon, Park Jae Muhamad Bula Muhammad Satya Adhitama Munawir Munawir NadaFajar Nurmani'ah Widiarti Nindya Sari Nur Rachman Supadmana Muda Nurul Emil Safitri Nurul Fachriyah Pragiwaka, Rafif Ezrha Praswanto, Djoko Hari Princilvanno Andreas Naukoko Pudya Heryana Purbo Suwandono Purnami Purnami Purnami Raihan Ilyasa Ray Dewi Redi Bintarto Redi Bintarto, Redi Ribka Apriliani Roekhudin, Roekhudin Rudianto Raharjo Rudy Soenoko Rudy Soenoko Sabila, Adriazka Fasa Saputro, Nurhadi Sari, Martina Puspita Sepriyatno, Riswan Slamet Wahyudi Sofana, Ilyas Sudjito Soeparman Sugiarto Sugiarto Suluh Elman Swara Suroso, Yosephine Diajeng Janur Prasasti, As’ad Munawir, Suryaningrat, Muhammad Sutrisno T Syaiful Iqbal Teguh Dwi Widodo Trismawati Trismawati Widya Wijayanti Widya Wijayanti widya wijayanti Wignyanto Wignyanto Wijayanto, Vera Dwi Wijono Wijono Yenni Mangoting Yuliansyah, Fisal Yusuf Hendrawan Zaki Baridwan