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2024 International Conference on Applied Sciences and Material Applications, ICASMA 2024

作者： Amiruddin, Erwin Awaluddin, Amir Rini, Ari S. Umar, Lazuardi Rianna, Martha Hadilala, Teguh P. Putri, Novalin Department of Physics Faculty of Mathematics Natural Sciences Riau University Pekanbaru28293 Indonesia Department of Chemistry Faculty of Mathematics Natural Sciences Riau University Pekanbaru28293 Indonesia Department of Physics Faculty of Mathematics and Natural Sciences Universitas Sumatera Utara Medan20155 Indonesia Magnetic Laboratory Faculty of Mathematics and Natural Sciences Riau University Pekanbaru28293 Indonesia Laboratorium Jalan Civil Engineering Magister Study Program Faculty of Civil Engineering Diponegoro University Central Java Semarang50275 Indonesia

In this study, the iron oxide/titanium dioxide (a-Fe2O3/TiO2) nanocomposites derived from Logas natural sand were prepared by ball milling method. The effects of milling time on the magnetic, optical properties and chemical composition of the nanocomposites were investigated using vibrating sample magnetometer (VSM), Uv-Vis spectroscopy and X-ray fluorescence (XRF) spectroscopy, respectively. The magnetization measurement results of all the samples showed the presence of ferromagnetic behaviour characterized by their low coercivity value ranged from 360.10 Oe to 86.50Oe. The optical properties of the samples strongly depend on milling time and showed that the band gaps of the iron oxide/titanium dioxide (a-Fe2O3/TiO2) nanocomposites decrease with increasing milling time. Some other elements such as silicon, aluminium and others were detected, which shows that the milled sample is not purely a-Fe2O3/TiO2 nanocomposites as confirmed by X-Ray Fluorescence. This study demonstrates the simple way of preparing the a-Fe2O3/TiO2 nanocomposites for environmental application. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Milling (machining)

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Selectivity of CO_(2)reduction reaction to CO on the graphitic edge active sites of Fe-single-atom and dual-atom catalysts:A combined DFT and microkinetic modeling

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Carbon Resources Conversion 2024年第1期7卷 21-31页

作者： Ahmad Nuruddin Adhitya Gandaryus Saputro Arifin Luthfi Maulana Febdian Rusydi Fiki Taufik Akbar Hadi Teguh Yudistira Hermawan Kresno Dipojono Advanced Functional Materials Research Group Faculty of Industrial TechnologyInstitut Teknologi BandungJl.Ganesha No.10Bandung 40132Indonesia Research Center for Nanosciences and Nanotechnology Institut Teknologi BandungJl.Ganesha No.10Bandung 40132Indonesia Research Center for Quantum Engineering Design Department of PhysicsFaculty of Science and TechnologyUniversitas AirlanggaSurabaya 60115Indonesia Theoretical High Energy Physics Research Division Faculty of Mathematics and Natural SciencesInstitut Teknologi BandungJl.Ganesha No.10Bandung 40132Indonesia Mechanical Engineering Study Program Institut Teknologi Sumatera(ITERA)South LampungLampungIndonesia Department of Materials Science and Engineering University of CaliforniaBerkeleyBerkeleyCA 94720United States

We study the carbon dioxide reduction reaction(CO_(2)RR)activity and selectivity of Fe single-atom catalyst(Fe-SAC)and Fe dual-atom catalyst(Fe-DAC)active sites at the interior of graphene and the edges of graphitic nanopore by using a combination of DFT calculations and microkinetic *** trend of limiting potentials for CO_(2)RR to produce CO can be described by using either the adsorption energy of COOH,CO,or their ***_(2)RR process with reasonable reaction rates can be achieved only on the active site configurations with weak tendencies toward CO *** efficiency of CO_(2)RR on a catalyst depends on its ability to suppress the parasitic hydrogen evolution reaction(HER),which is directly related to the behavior of H adsorption on the catalyst’s active *** find that the edges of the graphitic nanopore can act as potential adsorption sites for an H atom,and in some cases,the edge site can bind the H atom much stronger than the main Fe *** linear scaling between CO and H adsorptions is broken if this condition is *** condition also allows some edge active site configurations to have their CO_(2)RR limiting potential lower than the HER process favoring CO production over H2 production.

关键词： CO_(2)RR FexNy active site Fe-SAC Fe-DAC Graphitic edges DFT Microkinetic

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Development of High Temperature Lead-free Solders in the Al-95Zn + xSn Systems

Development of High Temperature Lead-free Solders in the Al-...

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International Conference on Electronics Packaging (ICEP)

作者： Andromeda Dwi Laksono Yee-Wen Yen Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei Taiwan R.O.C Study Program of Materials and Metallurgical Engineering Institut Teknologi Kalimantan Balikpapan East Kalimantan Indonesia

The high-temperature lead-free solder alloys of Al-95Zn with the modification of the addition of Sn have been investigated. Its proportion is used to adjust the metallographic microstructure, solidified precipitate phase, and liquidus temperature of the solder alloy. The characterization results, such as scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), and differential scanning calorimeter (DSC), will be discussed in this study. The study results show that the Al-Sn-Zn-based alloy has (Zn)+β- Sn+(Al) precipitates when heat-treated at 900°C for 36 h. Its liquidus temperature of Al-95Zn + xSn is between 342-385°C, and increased Sn content will decrease its liquidus temperature.

关键词： Heating systems Scanning electron microscopy X-ray scattering Lead X-ray diffraction Microstructure Dispersion

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The effect of methane and carbon dioxide ratio in the biogas to the fuel consumption of 2 stroke single cylinder (63 cc) engine of 750 watt electric generator 11th

The effect of methane and carbon dioxide ratio in the biogas...

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11th International Conference on Materials and Manufacturing Technology, ICMMT 2020

作者： Wijaya, I Wayan Guna Nindhia, Tjokorda Gde Tirta Surata, I. Wayan Sukmawati, Ni Made Dewi Dian Master student at St udy Program of Master in Mechanical Engineering Engineering Faculty Udayana University Jimbaran Bali80361 Indonesia Full Study Program of Mechanical Engineering Engineering Faculty Udayana University Jimbaran Bali80361 Indonesia Faculty of Medicine/Sanglah Hospital Udayana University Denpasar Bali80232 Indonesia

ISBN: (纸本)9783035737226

The 2 stroke single cylinder (63 cc) engine of 750 watt electric generator is very popular in the application because providing enough amount of electricity for small house hold with compact size, light weight with reasonable price. Usually this type of electric generator is fuelled with gasoline that mixed with oil as lubricant. The cylinder volume of the engine is usually around 63 cc. This type of engine can be fuelled with biogas with addition component to mix biogas together with air and lubricant, and set the compression pressure at 10 bar. Biogas mainly contain methane (CH4), carbon dioxide (CO2), moisture (H2O), and hydrogen sulfide (H2S). The CH4 is combustible gas and can be used as a fuel for internal combustion engine. Moisture and H2S are easily removed from biogas. To remove CO2 from biogas is about difficult and costly, therefore acceptable content of CO2 in the biogas should be investigate related with the fuel consumption. This research is conducted to understand the influent of ratio CH4 and CO2 in the biogas to fuel consumption of the 2 stroke single cylinder engine of 750 watt electric generator. The variations ratio of CH4 and CO2 were obtained from anaerobic digester with batch system. The results indicate that the CH4 and CO2 ration in the range 1.667-1.967 will yield optimum efficiency that reach biogas consumption in the range of 9.1-9.8 liter/minute. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Biogas

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Analysis performance of forced convection cooling using synthetic jets with wave variations (sine, square, and triangular) 3

Analysis performance of forced convection cooling using synt...

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3rd International Conference on Science and Technology 2019, ICST 2019

作者： Putra, Bintang Arya Rhakasywi, Damora As'Adi, M. Cholis, Nur Mechanical Engineering Study Program Faculty of Engineering Universitas Pembangunan Nasional Veteran Jakarta Indonesia

Cooling effectiveness using a cooling fan on an electronic device becomes a benchmark. Speaker- based synthetic jets that are becoming innovations today work on the principle of zero input mass, producing air in the cavity with an oscillating membrane which results in the suction phase occurring in the orifice hole. The generated air then flows through the orifice to pound the heat source as a forced convection cooler. Speakers used as oscillating actuators resemble waveforms using sine, square, and triangular wave functions with frequencies of 80, 100, and 120 Hz. Air flow simulation created using Fluent CFD. The use of wave variations has different characteristics. Triangular waves indicate the final test temperature reaches 27oC, with an optimum frequency of 80 Hz. Air flow created in the form of vortex flow with a type of turbulent flow. The electric power consumption of cooling fans reaches ten times the consumption of synthetic jet power. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Orifices

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Analyzing the Behavioral Aspects of Implementing Green IT in an Academic Environment 8

Analyzing the Behavioral Aspects of Implementing Green IT in...

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8th International Conference on Information Management and Technology, ICIMTech 2023

作者： Syamsuar, Dedy Triando, Fero Ulfa, Maria Antoni, Darius Mailangkay, Adele Witarsyah, Deden School of Information Systems Bina Nusantara University Information Systems Department Jakarta11480 Indonesia Universitas Bina Darma Postgradute Department Palembang Indonesia Universitas Bina Darma Information System Study Program Computer Science Faculty Palembang Indonesia Universitas Indo Global Mandiri Faculty of Computer Science Palembang Indonesia School of Industrial Engineering Telkom University Bandung Indonesia

ISBN: (纸本)9798350326093

Environmental awareness has recently emerged as one of the most crucial topics. As a result, various groups advocate for these technologies and research ways to promote their usage in various contexts. This study examines the factors influencing the intention and use of green technology among academics. This study integrates Price Value (PV) and Consideration of future consequence (CFC) to Theory Planned Behavior (TPB) as a theoretical basis. Two hundred five valid replies were gathered and processed through statistical analysis. The results of this study partly support the developed hypotheses. Four hypotheses developed from TPB have presented significant relationships. However, PV and CFC were not. The findings indicate that individuals in this study did not consider CFC or PV of green IT products as critical factors in their decision-making process. Findings also suggest that for implementation success, competent parties must consider the campaign to increase individual awareness and provide financial support regarding environmental policy. © 2023 IEEE.

关键词： Decision making

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A comprehensive analysis of wind power integrated with solar and hydrogen storage systems: Case study of Java's Southern coast

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International Journal of Hydrogen Energy 2025年 138卷 1279-1292页

作者： Hesty, Nurry Widya Fauziah, Khotimatul Aminuddin Zaky, Toha Fithri, Silvy Rahmah Aman, Mohamad Aziz, Amiral Rostyono, Didik Wijayanto, Rudi Purwo Ifanda Research Center for Energy Conversion and Conservation National Research and Innovation Agency KST BJ Habibie Serpong Tangerang Selatan15343 Indonesia Research Center for Process and Manufacturing Industry Technology National Research and Innovation Agency Building 625 KST BJ Habibie Serpong Banten Tangerang Selatan15314 Indonesia Magister of Industrial Engineering University of Mercu Buana Jakarta11650 Indonesia Study Program of Advanced Climatology Department of Geophysics and Meteorology IPB University Bogor16680 Indonesia Survey and Testing Center for Electricity New Renewable Energy and Energy Conservation Technology Ministry of Energy and Mineral Resources Jakarta12230 Indonesia

Wind and solar energy are vital to the global transition toward sustainable energy systems, driven by the need to reduce fossil fuel dependence, mitigate climate change, and enhance energy security. This study aims to optimize system performance by integrating hydrogen technology and addressing capacity shortages and excess energy. First, a comprehensive analysis of wind characteristics in a strategically important area to meet unaccomplished Indonesia's 2023 wind energy targets, focusing on Java's southern coast using wind speed data from the System Advisor Model (SAM), was conducted. Four scenarios are then evaluated: wind turbine (WT)-battery energy storage system (BESS), WT-photovoltaic (PV)-BESS, WT-fuel cell (FC)-electrolyzer (EL)-hydrogen tank (H2T), and WT-PV–FC–EL-H2T. Key metrics analyzed include excess energy, Levelized Cost of Electricity (LCOE), Net Present Cost (NPC), capacity shortage (CS), and electrolyzer full-load hours (EFH). Results show that average wind speeds reach 4.2 m/s in Pandeglang, with the WT–FC–EL-H2T system being the most reliable, exhibiting a 5% capacity shortage and 68.5% excess electricity. The WT-PV–FC–EL scenario is the most cost-effective, with a COE of $0.508/kWh and an NPC of $2.6 million. These findings provide valuable insights for improving sustainable energy infrastructure in the region. © 2024 Hydrogen Energy Publications LLC

关键词： Clean energy

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Measurement of perception and implementation of sustainable supply chain management at PT Tetra Pak Indonesia 3

Measurement of perception and implementation of sustainable ...

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3rd International Conference on Eco engineering Development, ICEED 2019

作者： Kristina, Helena J. Christiani, Agustina Jobiliong, Eric Therio, Letycia Andreanto, Reza Industrial Engineering Study Program Universitas Tarumanegara Jakarta Indonesia Industrial Engineering Study Program Faculty of Science and Technology Universitas Pelita Harapan Lippo Village Tangerang Indonesia PT Tetra Pak Indonesia

Sustainable supply chain management (SSCM) is a form of proactive action taken by the company and its supply chain to remain competitive by introducing products and production processes that are environmentally friendly and socially *** Tetra Pak Indonesia as a company engaged in the processing and packaging for food and beverages, is committed to reduce the environmental impact of all operations and prioritize environmental aspects for each product and solution offered. Although there have been many sustainability efforts undertaken by PT Tetra Pak Indonesia, the perspective and implementation of its sustainable supply chain management has never been measured. This research was conducted to measure the perception and implementation of sustainable supply chain management (SSCM) activities of *** Pak Indonesia, in order to add information about the development of sustainable supply chain management practices in Indonesia. Data were collected in two ways: in depth interviews and questionnaires. Based on the result of interview and questionnaire, *** Pak Indonesia gets an actual implementation index value of SSCM activities of 0.88, and has an overall perception index value of 0.85. This indicates that PT. Tetra Pak Indonesia is a company that has a perception towards sustainability and has actually implemented SSCM activities. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Supply chain management

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Catalytic cracking of used cooking oil using Chromium impregnated charcoal (Cr-charcoal) catalyst 6

Catalytic cracking of used cooking oil using Chromium impreg...

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6th International Conference on Mathematics, Science, and Education, ICMSE 2019

作者： Nazarudin Prabasari, I.G. Ulyarti Susilawati Oktadio, A. Chemistry Engineering Study Program Faculty of Engineering Universitas Jambi Indonesia Chemistry Education Study Program Faculty of Teacher Training and Education Universitas Jambi Indonesia Center of Energy and Nanomaterial Study Universitas Jambi Indonesia Agricultural Product Technology Study Program Faculty of Agricultural Technology Universitas Jambi Indonesia Physical Education Faculty of Teacher Training and Education Universitas Mataram Indonesia

One of the solutions for fossil fuel crisis is to find alternative energy based on renewable materials. In this research, catalytic cracking of used cooking oil has been investigated to produce biofuel using Cr-charcoal catalyst. The charcoal was produced from solid waste (shell) of palm oil industry. Chromium solutions with various concentrations (1%, 2%, and 3%) were impregnated into charcoal to produce Cr-charcoal catalyst. The catalysts were used for catalytic cracking of used cooking oil at three levels of temperature: 450°C, 500°C and 550°C. The XRD patterns and SEM images of the catalyst showed that the catalyst was in amorphous form. SEM-EDX analysis showed that the Chromium was impregnated into charcoal successfully with amount of Chromium absorbed into charcoal was 0.51%;1.07% and 14.38% respectively. The SEM images also showed that charcoal as supported catalyst and Cr-charcoal catalyst have unique pores. The highest liquid oil fraction was obtained by catalytic cracking at 500°C using 3% Cr-Charcoal catalyst. The liquid product of this process was mainly diesel oil with 8-24 carbon atoms (86.35%) and the rest was liquid product with 6-7 carbon atoms. © Published under licence by IOP Publishing Ltd.

关键词： Catalysts

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Design of IOT based facial recognition door access control locker services at tourist attractions in Bali 2

Design of IOT based facial recognition door access control l...

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2nd International Conference on Vocational Education and Technology, IConVET 2019

作者： Widiartha, K.K. Ekayana, A.A.G. Study Program of Informatics Engineering STMIK STIKOM Indonesia Denpasar-Bali80225 Indonesia

Safety and comfort are things that everyone wants to get on a trip. Every tourist who wants a vacation to one of the tourist destinations will prioritize these two things. Leisure in travel is influenced by the availability of supporting facilities. From accommodation, restaurants to facilities provided by tourism actors in each tourism object. One problem is the lack of facilities in attractions such as luggage storage (lockers), many tourists in enjoying tourism objects carrying luggage such as backpacks;groceries to backpacks for tourists are classified as backpackers. Of course this will disrupt the comfort of traveling. In the research conducted, researchers wanted to design a system of goods storage services as a form of supporting industry 4.0 in the tourism environment. By designing an image of the storage media of goods by implementing access control for doors in each locker based on image processing supported by a microcontroller. The method used that focuses on facial recognition as image input using the PCA (Principal Component Analysis) method, which can measure the Euclidean distance in an object's face image. The design as a blueprint makes it easier to develop the next item of storage media (lockers).The results of this study indicate that the facial recognition method used is able to extract facial features and be recalibrated to activate the locker that is owned by the face object. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Principal component analysis

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