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16th International Conference on Quality in Research, QiR 2019

作者： Paduraksa, Jagad Luthfi, Muhammad Verdianto, Ariono Subhan, Achmad Widayatno, Wahyu Bambang Prihandoko, Bambang Kartini, Evvy Hudaya, Chairul Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Energy System Engineering Study Program Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Research Center for Physics Indonesian Institute of Sciences PUSPIPTEK SerpongTangerang Selatan15314 Indonesia Center for Science and Technology of Advanced Materials BATAN Kawasan Puspiptek Tangerang15314 Indonesia

ISBN: (纸本)9783035715996

Lithium-Ion Capacitor (LIC) has shown promising performance to meet the needs of high energy and power-density-energy storage system in the era of electric vehicles nowadays. The development of electrode materials and electrolytes in recent years has improvised LIC performance significantly. One of the active materials of LIC electrodes, activated carbon (AC), can be synthesized from various biomass, one of which is the water hyacinth. Its abundant availability and low utilization make the water hyacinth as a promising activated carbon source. To observe the most optimal physical properties of AC, this study also compares various activation temperatures. In this study, full cell LIC was fabricated using LTO based anode, and water hyacinth derived AC as the cathode. The LIC full cell was further characterized to see the material properties and electrochemical performance. Water hyacinth derived LIC can achieve a specific capacitance of 32.11 F/g, the specific energy of 17.83 Wh/kg, and a specific power of 160.53 W/kg. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Activated carbon

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Design and Implementation study of 3.12 kWp On – Grid Rooftop Solar PV system

Design and Implementation Study of 3.12 kWp On – Grid Rooft...

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International Conference on Electrical engineering and Informatics, ICEEI

作者： Ariyq Naufal Mizard Dwi Riana Aryani Ariono Verdianto Chairul Hudaya Faculty of Engineering Universitas Indonesia Energy System Engineering Master Study Program Faculty of Engineering Universitas Indonesia Kampus Baru UI Depok Republic of Indonesia

Conversion of fossil fuels as an energy source can be achieved by optimizing the use of renewable energy. One of the most used renewable energy is solar photovoltaics (PV). At present, solar power plant is an electrification support system for certain buildings because the abundant availability of solar radiation. On this research, Power and energy observations are carried out to determine measure the load power trend, the amount of energy flow from PV to the load, as well as import or export power from or to utility grid by direct measurement on Mosque of Faculty of engineering, Universitas Indonesia. According to the study, the highest power generated by solar power plant mostly occurs at 12:00 - 13:00 with the highest power generated by PV is 2,344 W and the exported power is 939 W, and 32.19% - 55.67% electricity energy savings consumption from utility grid.

关键词： Power generation Inverters Power measurement Current measurement Power cables Renewable energy sources energy measurement

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The effect of koh activator concentration upon the characteristics of biomass-derived water hyacinth process on lithium-ion capacitor 16th

The effect of koh activator concentration upon the character...

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16th International Conference on Quality in Research, QiR 2019

作者： Luthfi, Muhammad Paduraksa, Jagad Verdianto, Ariono Pambudi, Yoyok Dwi Setyo Priyono, Bambang Syahrial, Anne Zulfia Lee, Joong Kee Hudaya, Chairul Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Energy System Engineering Study Program Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Department of Metallurgy and Materials Engineering Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Center for Nuclear Reactor Technology and Safety BATAN Puspiptek Area SerpongTangerang Selatan15310 Indonesia Hwarang-ro 14-gil 5 Seongbuk-gu Seoul02792 Korea Republic of

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Techno-economic analysis of slip ring motor replaced by standard squirrel cage induction motor with VSD

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Journal of Physics: Conference Series 2019年第3期1402卷

作者： H Dewi F H Jufri C Hudaya Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Depok 16424 Indonesia Energy System Engineering Master Study Program Faculty of Engineering Universitas Indonesia Depok 16424 Indonesia

Induction motor slip ring-type technology has been widely used in industrial as one of the crucial electrical components to convert energy mechanically. The construction of this motor is more complex than other standardized induction motors such as squirrel cage. The complexity lies in the connection between the rings and brushes which requires more maintenance. Meanwhile, Squirrel cage motor that is supported by a Variable Speed Drive allows its user to start motor smoothly and adjusts the speed more efficiently. In this study, we exclusively investigate the possibility of the outdated technology replacement by using squirrel cage standardized induction motor based on its compatibility and the financial perspective as well. To prevent any coming up problems, the selections of new motor and VSD must fulfil the requirement of the existing system. Technical data were collected from customer's SCADA and nameplates. While the financial calculation was made based on the payback period. In this case, the payback period is projected within two years and the energy saving could reach 69% that basically depends on operation patterns. According to our perspective, standard squirrel cage motor potentially replaces the slip ring motor in which it is not only having a simple operation but also less maintenance and energy cost.

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Reshaped Weyl fermionic dispersions driven by Coulomb interactions in MoTe2

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Physical Review B 2022年第4期105卷 045143-045143页

作者： Seoung-Hun Kang Sangjun Jeon Hyun-Jung Kim Wonhee Ko Suyeon Cho Se Hwang Kang Sung Wng Kim Heejun Yang Hyo Won Kim Young-Woo Son Korea Institute for Advanced Study Seoul 02455 Korea Department of Physics Chung-Ang University Seoul 06974 Korea Peter Grünberg Institut and Institute for Advanced Simulation Forschungszentrum Jülich and JARA D-52425 Jülich Germany Samsung Advanced Institute of Technology Suwon 16678 Korea Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Chemical Engineering and Materials Science Graduate Program in System Health Science and Engineering Ewha Womans University Seoul 03760 Korea Department of Energy Science Sungkyunkwan University Suwon 16419 Korea Department of Physics Korea Advanced Institute of Science and Technology Daejeon 34141 Korea

We report the direct evidence of impacts of the Coulomb interaction in a prototypical Weyl semimetal, MoTe2, that alter its bare bands in a wide range of energy and momentum. Our quasiparticle interference patterns measured using scanning tunneling microscopy are shown to match the joint density of states of quasiparticle energy bands including momentum-dependent self-energy corrections, while electronic energy bands based on the other simpler local approximations of the Coulomb interaction fail to explain neither the correct number of quasiparticle pockets nor the shape of their dispersions observed in our spectrum. With this, we predict a transition between type-I and type-II Weyl fermions with doping and resolve its disparate quantum oscillation experiments, thus highlighting the critical roles of Coulomb interactions in layered Weyl semimetals.

关键词： Electronic structure First-principles calculations Quasiparticles & collective excitations Topological materials Weyl fermions Scanning electron microscopy Scanning tunneling spectroscopy

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Review on cesium doping in perovskite active layer and transport layer towards high-efficiency and stability

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AIP Conference Proceedings 2024年第1期3213卷

作者： William Harrison Winnetouw Akhmad Herman Yuwono Nofrijon Sofyan Donanta Dhaneswara Widodo Wahyu Purwanto Departement of Metallurgical and Materials Engineering Faculty of Engineering Universitas Indonesia Depok West Java 16424 Indonesia Interdisciplinary Engineering Education and Research Unit Faculty of Engineering Universitas Indonesia Depok West Java 16424 Indonesia Departement of Chemical Engineering Faculty of Engineering Universitas Indonesia Depok West Java 16424 Indonesia Energy System Engineering Study Program Faculty of Engineering Universitas Indonesia Depok West Java 16424 Indonesia

Perovskite material is considered as one of next-generation solar cells that will have good potential to replace the current silicon-based solar cells. However, several disadvantages still limit the application of this materials due to the unstable phase, crystal defects during fabrication, toxic, and susceptible to cell degradation upon humidity and ultraviolet exposure. Several methods and engineering works have been made to overcome those disadvantages including doping, a technique which induces element(s) or compound(s) that could obtain better performance. One of the promising elements is cesium (Cs) that can be doped as a cation, compound or additive which would alter the interface between the electron-selective layer and the strain of perovskite structure. By having this element, the improved higher efficiency and operation stability can be significantly expected. This review article summarizes the efforts have been carried out by researchers working on Cesium doping on the perovskite solar cell towards high efficiency and operational stability. In has been found up to present that the best Cesium cation doping was able to bring up the improvement of efficiency up to 23,71%.

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Coulomb interaction-driven reshaped weyl fermionic dispersions in MoTe2

arXiv

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arXiv 2021年

作者： Kang, Seoung-Hun Jeon, Sangjun Kim, Hyun-Jung Ko, Wonhee Cho, Suyeon Kang, Se Hwang Kim, Sung Wng Yang, Heejun Kim, Hyo Won Son, Young-Woo Korea Institute for Advanced Study Seoul02455 Korea Republic of Department of Physics Chung-Ang University Seoul06974 Korea Republic of Peter Grünberg Institute Institute for Advanced Simulation Forschungszentrum Jülich Jülich52428 Germany Samsung Advanced Institute of Technology Suwon16678 Korea Republic of Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Chemical Engineering and Materials Science Graduate Program in System Health Science and Engineering Ewha Womans University Seoul03760 Korea Republic of Department of Energy Science Sungkyunkwan University Suwon16419 Korea Republic of Department of Physics Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of

We report the direct evidence of impacts of the Coulomb interaction in a prototypical Weyl semimetal, MoTe2, that alter its bare bands in a wide range of energy and momentum. Our quasiparticle interference patterns measured using scanning tunneling microscopy are shown to match the joint density of states of quasiparticle energy bands including momentum-dependent self-energy corrections, while electronic energy bands based on the other simpler local approximations of the Coulomb interaction fail to explain neither the correct number of quasiparticle pockets nor shape of their dispersions observed in our spectrum. With this, we predict a transition between type-I and type-II Weyl fermions with doping and resolve its disparate quantum oscillation experiments, thus highlighting the critical roles of Coulomb interactions in layered Weyl semimetals. © 2021, CC BY-NC-ND.

关键词： Dispersions

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Synthesis of mercaptoethyl ester of palm fatty acid distillate: Effects of dehydration methods

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IOP Conference Series: Materials Science and engineering 2020年第1期823卷

作者： I Dewa Gede Arsa Putrawan Dicka Ar Rahim Andri Patuan Anggi Sitompul Salma Rifasari Wakana Research Group on Chemical Engineering Product Design & Development Faculty of Industrial Technology Institut Teknologi Bandung Bandung Indonesia. Research Group on Chemical Engineering Energy & Process System Faculty of Industrial Technology Institut Teknologi Bandung Bandung Indonesia. Study Program of Chemical Engineering Faculty of Industrial Technology Institut Teknologi Bandung Bandung Indonesia.

This research was aimed to evaluate the synthesis of mercaptoethyl ester of palm fatty acid distillate (PFAD) where water as a byproduct was removed by using vacuum distillation and azeotropic distillation. The reactions were done in a batch reactor using para-toluene sulfonic acid (pTSA) as a catalyst. The performances of the synthesis were evaluated by measuring the sulfhydryl content and yield of the product. Compared to dehydration by vacuum distillation, dehydration by azeotropic distillation gave lower sulfhydryl content and yield but faster reaction completion. Azeotropic distillation gave sulfhydryl content and yield in the range of 6–7% and 57–74%, respectively. Vacuum distillation gave sulfhydryl content and yield in the range of 7–9% and 75–85%, respectively.

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Evaluating the impacts of environmental and human health of the critical minerals mining and processing industries in Indonesia using life cycle assessment

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Case Studies in Chemical and Environmental engineering 2024年 10卷

作者： Wahyono, Yoyon Sasongko, Nugroho Adi Trench, Allan Anda, Martin Hadiyanto, Hadiyanto Aisyah, Nyayu Anisah, Anisah Ariyanto, Novy Kumalasari, Isnaeni Putri, Virny Zasyana Eka Lestari, Mutia Citrawati Panggabean, Lambas Parlaungan Ridlo, Rohmadi Sundari, Sundari Suryaningtyas, Anissa Dewi Novianti, Endah Dwi Hakim, Muhammad Raihan Farras Prihatin, Anggara Lomak Matin, Hashfi Hawali Abdul Research Center for Sustainable Production System and Life Cycle Assessment National Research and Innovation Agency - BRIN Prof. BJ. Habibie Complex Area Banten Tangerang Selatan 15314 Indonesia Energy Security Graduate Program Republic of Indonesia Defense University IPSC Sentul Area West Java 16810 Indonesia Centre for Exploration Targeting School of Earth Sciences The University of Western Australia 35 Stirling Highway Crawley 6009 WA Australia UWA Business School 35 Stirling Highway Crawley 6009 WA Australia Environmental Engineering Murdoch University Murdoch 6150 WA Australia Doctoral Program of Environmental Science School of Postgraduate Studies Diponegoro University Central Java Semarang 50241 Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Central Java Semarang 50275 Indonesia Department of Mechanical Engineering Vocational School Gadjah Mada University Sleman Yogyakarya 55281 Indonesia Study Program of Environmental Science Faculty of Mathematics and Natural Science Universitas Sebelas Maret Central Java Surakarta 57126 Indonesia

The critical minerals industries in Indonesia may pose possible environmental and human health risks due to the release of pollutants into soil, water, and air, as well as the use of materials and energy. This study investigates the possible environmental and human health impacts of Indonesia's nickel, gold, copper, tin, and bauxite mining and processing industries. This study utilizes the latest version of the OpenLCA software, version 2.0, in combination with the Ecoinvent 3.8 database. To evaluate potential environmental consequences and health effects on humans, CML-IA Baseline and Environmental Priority Strategies (EPS) are employed in product development. The EPS system was developed utilizing a hierarchical methodology with the objective of furnishing the product developer with data regarding the financial impact of human health impairment resulting from a particular product development. The production of one tonne of gold, nickel, bauxite, tin, and copper results in the emission of 7.34.E+07, 4.61.E+04, 3.10.E+04, 1.02.E+04, 8.01.E+03 kg CO₂ eq/t, respectively, contributing to global warming. This production is associated with asthma cases of 7.79.E+01 (gold industry), 2.21.E−03 (copper industry), 1.81.E−03 (tin industry), 9.21.E−04 (nickel industry), and 4.71.E−06 (bauxite industry) Personyears/t. Electricity consumption and the release of carbon dioxide are the main factors contributing to global warming. The primary cause of asthma cases is the utilization of fuel oil and electricity. Power plant chimneys can employ various technologies, such as cyclones, bag filters, and scrubbers, to mitigate the release of polluting gas emissions. The critical mineral industry must prioritize handling and governing of steam power facilities to minimize their negative effects on the environment and human health. © 2024 The Authors

关键词： Critical minerals industries Environmental impacts Human health impacts Life cycle assessment

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The potency of hydrothermally prepared sulfated silica (SO4/SiO2) as a heterogeneous acid catalyst for ethanol dehydration into diethyl ether

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Chemosphere 2023年第1期341卷

作者： Pratika, Remi Ayu Wijaya, Karna Utami, Maisari Mulijani, Sri Patah, Aep Alarifi, Saud Ram Mani, Ravishankar Kumar Yadav, Krishna Ravindran, Balasubramani Chung, Woo Jin Chang, Soon Woong Munusamy-Ramanujam, Ganesh Study Program of Chemistry Faculty of Mathematics and Natural Sciences Universitas Palangka Raya Palangka Raya Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Gadjah Mada Yogyakarta55281 Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Islam Indonesia Yogyakarta55584 Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences Institut Pertanian Bogor Bogor Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Bandung Indonesia Department of Zoology College of Science King Saud University P.O. Box 2455 Riyadh11451 Saudi Arabia Department of Pharmaceutical Biology Faculty of Pharmaceutical Sciences UCSI University Cheras Taman Connaught Kuala Lumpur56000 Malaysia Faculty of Science and Technology Madhyanchal Professional University Ratibad Bhopal462044 India Environmental and Atmospheric Sciences Research Group Scientific Research Center Al-Ayen University Thi-Qar Nasiriyah 64001 Iraq Department of Environmental Energy and Engineering Kyonggi University Yeongtong-Gu Gyeonggi-Do Suwon16227 Korea Republic of Department of Medical Biotechnology and Integrative Physiology Institute of Biotechnology Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Thandalam Tamil Nadu Chennai602105 India Molecular Biology and Immunobiology Division Interdisciplinary Institute of Indian System of Medicine SRM-IST Tamil Nadu Kattankulathur603203 India

The dehydration of ethanol into diethyl ether over a SO4/SiO2 catalyst was investigated. The SO4/SiO2 catalysts were prepared by the sulfation method using 1, 2, and 3 M of sulfuric acid (SS1, SS2, and SS3) via hydrothermal treatment. This study is focused on the synthesis of a SO4/SiO2 catalyst with high total acidity that can be subsequently utilized to convert ethanol into diethyl ether. The total acidity test revealed that the sulfation process increased the total acidity of SiO2. The SS2 catalyst (with 2 M sulfuric acid) displayed the highest total acidity of 7.77 mmol/g, whereas the SiO2 total acidity was only 0.11 mmol/g. Meanwhile, the SS3 catalyst (with 3 M sulfuric acid) has a lower total acidity of 7.09 mmol/g due to the distribution of sulfate groups on the surface having reached its optimum condition. The crystallinity and structure of the SS2 catalyst were not affected by the hydrothermal treatment or the sulfate process on silica. Furthermore, The SS2 catalyst characteristics in the presence of sulfate lead to a flaky surface in the morphology and non-uniform particle size. In addition, the surface area and pore volume of the SS2 catalyst decreased (482.56–172.26 m2/g) and (0.297–0.253 cc/g), respectively, because of the presence of sulfate on the silica surface. The SS2 catalyst's pore shape information explains the formation of non-uniform pore sizes and shapes. Finally, the activity and selectivity of SO4/SiO2 catalysts in the conversion of ethanol to diethyl ether yielded the highest ethanol conversion of 70.01% and diethyl ether product of 9.05% from the SS2 catalyst (the catalyst with the highest total acidity). Variations in temperature reaction conditions (175–225 °C) show an optimum reaction temperature to produce diethyl ether at 200 °C (11.36%). © 2023 Elsevier Ltd

关键词： Silica

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