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Kuwait Journal of Science 2025年第3期52卷

作者： Ahmad Aminudin Rumaisya Az-zahra Selly Feranie Lilik Hasanah Siti Kudnie Sahari Endi Suhendi Physics Study Program Universitas Pendidikan Indonesia Bandung West Java Indonesia Faculty of Engineering Universiti Malaysia Sarawak UNIMAS Kota Samarahan 94300 Sarawak Malaysia

LaFeO 3 is widely applied in ethanol gas sensors due to material composition and the stability of its sensing parameters. However, LaFeO 3 is still limited in gas sensing properties, necessitating doping to enhance the performance of gas sensors like palladium (Pd). In this study, the optimization of the ethanol gas sensor was explored by adding reduced graphene oxide (rGO) to Pd–LaFeO 3 , focusing on adsorption energy and band gap energy using density functional theory (DFT) with the generalized gradient approximation (GGA-PBEsol) simulation method. The results show that Pd–LaFeO 3 adsorption energy of −2.01 eV, which increases to −2.29 eV with the addition of rGO, indicates stronger ethanol adsorption. The band gap of Pd–LaFeO 3 was 2.34 eV before exposure to ethanol gas and decreased to 2.06 eV upon exposure. After incorporating rGO, the band gap further narrowed, from 0.11 eV before exposure to 0.05 eV after exposure. The narrowing of the energy band potentially enhances the sensor's response. Those results indicate that adding rGO to Pd–LaFeO 3 shows promising potential for ethanol gas sensor applications.

关键词： Gas sensors LaFeO 3 Pd rGO Adsorption energy Band gap

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The effect of Aerobic and Anaerobic composting methods against water content and the amount of Pathogenic Microorganisms from Sludge treatment plant and organic waste 1

The effect of Aerobic and Anaerobic composting methods again...

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1st Annual Conference on Environmental Science, Society and its Application, ACESSA 2019

作者： Hutagalung, Winny Laura C. Rinaldi Environemntal Engineering Study Program Universitas Jambi Pondok Meja Jambi Indonesia Study Program of Environmental Engineering Faculty of Engineering Universitas Jambi Jambi Indonesia

Jambi City has a Sludge Treatment Plant (IPLT) located in Talang Bakung. IPLT Talang Bakung processes sludge from household septic tanks. The processing consists of 1 anaerobic pond, 3 facultative ponds and 3 maturation ponds. The result of processing at IPLT is water that can be discharged into water bodies and sludge. The sludge still can be used, but it must be processed first. One of the sludge processing is a composting process. The composting process consists of two types, namely the composting process aerobically and anaerobically. This study aimed to compare the results of aerobic and anaerobic composting from IPLT sludge mixed with organic matter. Compost characteristics that are reviewed in this study are physical characteristics, those are water content and biological characteristics, namely pathogenic bacteria. The parameters measured in this study were the temperature, pH and number of Fecal Coliform bacteria at the beginning and end of the study. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Lakes

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Analysis of the institutional development of drinking water supply systems in XYZ City,Indonesia coastal area

River

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River 2023年第2期2卷 158-168页

作者： Firdaus Ali Dwi L.Lestari Marsya D.Putri Khalidah N.Azmi Indonesia Water Institute South JakartaIndonesia Department of Civil Engineering Faculty of EngineeringEnvironmental Engineering Study ProgramUniversitas IndonesiaKampus UI DepokDepok CityIndonesia

Based on the Regulation of the Minister of Public Works and Public Housing Number 4 of 2020,drinking water supply management can stand alone or work together with other *** local government establishes a Regional Drinking Water Company which has responsibility for supplying drinking water at the regency/city *** coastal city as the object of study manages clean water then transfers under a private *** to government restrictions regarding the authority to provide clean water,a technical implementation unit was formed for better solution in clean water *** new form of institution will be able to make decisions and carry out execution at any time because it is directly under the authority of the government,it can also apply the concept of good governance to support more transparent *** accordance with the policy,the new institutional form will be able to finance itself,develop the level of service and contribute to regional development as a source of local ***,the institutional transition requires adaptation both from a functional and operational *** this study,an analysis of the readiness for the transition of institutional forms is carried out to minimize conflicts such the lack of improvement in the quality of drinking water services due to limited government authority,insufficient qualified human resources in water management,and the difficulty of developing drinking water service infrastructure because it still depends on the private *** analysis of the structure and human resources associated with clean water service targets also *** strengthening,both regulatory and institutional,is necessary to maximize the roles and functions of the relevant *** a more comprehensive understanding in the preparation of contracts and division of authority,no parties will be aggrieved in the long term.

关键词： clean water services human resources institutions

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Empirical mode decomposition of near-infrared spectroscopy signals for predicting oil content in palm fruits

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Information Processing in Agriculture 2023年第3期10卷 289-300页

作者： Inna Novianty Ringga Gilang Baskoro Muhammad Iqbal Nurulhaq Muhammad Achirul Nanda Computer Engineering Study Program College of Vocational StudiesIPB UniversityBogor 16680Indonesia Informatics Management Study Program College of Vocational StudiesIPB UniversityBogor 16680Indonesia Technology and Plantation Production Management Study Program College of Vocational StudiesIPB UniversityBogor 16680Indonesia Department of Agricultural and Biosystem Engineering Faculty of Agro-Industrial TechnologyUniversitas PadjadjaranJatinangor 45363Indonesia

Oil content estimation in palm fruits is a precious property that significantly impacts oil palm production,starting from the upstream and *** content can be used to monitor the progress of the oil palm fresh fruit bunch(FFB)and be applied to identify product *** on the near-infrared(NIR)signals,this study proposes an empirical mode decomposition(EMD)technique to decompose signals and predict the oil content of palm ***,350 palm fruits with Tenera varieties(Elaeis guineensis ***),at various ages of maturity,were harvested from the Cikabayan Oil Palm Plantation(IPB University,Indonesia).Second,each sample was sent directly to the laboratory for NIR signal measurements and oil content ***,the EMD analysis and arti-ficial neural network(ANN)were employed to correlate the NIR signals and oil ***,a robust EMD-ANN model is generated by optimizing the lowest possible *** on performance evaluation,the proposed technique can predict oil content with a coefficient of determination(R2)of 0.933±0.015 and a root mean squared error(RMSE)of 1.446±*** results demonstrate that the model has a good predictive capacity and has the potential to predict the oil content of palm fruits directly,without neither solvents nor reagents,which makes it environmentally ***,the proposed technique has a promising potential to be applied in the oil palm *** like this will lead to the effective and efficient management of oil palm production.

关键词： Artificial neural network Empirical mode decomposition Oil palm Oil content prediction

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Design of small single cylinder 4 stroke spark ignition engine for electric generator with flexible fuel: Biogas, liquefied petroleum gas (lpg) or gasoline 11th

Design of small single cylinder 4 stroke spark ignition engi...

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

作者： Lie, David Nindhia, Tjokorda Gde Tirta Surata, I. Wayan Wirawan, Nengah Master student at Study program of M aster in Mechanical Engineering Engineering Faculty Udayana University Jimbaran Bali Indonesia Study Program of Mechanical Engineering Engineering Faculty Udayana University Jimbaran Bali Indonesia

ISBN: (纸本)9783035737226

The available of conventional fuels are fluctuating depend on distribution from the source production to consumer. The availability of biogas as renewable energy is increasing due to establishments of many organic wastes processing worldwide. The need of electricity to support daily life activity is a must, but the availability of electric source in remote area is limited especially for a farm that far away from commercial line distribution of electricity. This work is dedicated to solve this problem. The single cylinder 4 stroke spark ignition engine (83 cc) was designed to be able to be fuelled flexibly by using biogas or liquefied petroleum gas (LPG), or gasoline if sometime the biogas not available during initiation of the process or during maintenance of anaerobic digester. The engine is still can be run to provide electricity by using conventional fuel such as LPG or gasoline. The full consumption as well as emission of this flexible fuel engine was investigated. It is found that the fuel consumption is 9.97 L/mint for Biogas, 0.004 L/mint for gasoline and 2.24 L/mint for LPG. Surprisingly by using biogas the emission of carbon monoxide (CO) was down to almost zero (0.02 ppm), comparing gasoline 0.32 ppm, and LPG 0.4 ppm. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Gasoline

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Comparative performance analysis between conventional and square cyclones for solid Particle-Gas Separation: A review

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Materials Today: Proceedings 2022年 63卷 S318-S325页

作者： Malahayati, Nur Darmadi, D. Alisa Putri, Cut Mairiza, Lia Rinaldi, Wahyu Yunardi, Y. Master Program at the Chemical Engineering Dept. Faculty of Engineering Universitas Syiah Kuala Banda Aceh 23111 Indonesia Department of Chemical Engineering Universitas Syiah Kuala Banda Aceh 23111 Indonesia

Conventional cylindrical-body cyclone separators have been in use in the industry for a long time due to their many benefits, including simple design and construction, low running costs, no moving parts, and significant particle collection efficiency. Many studies have been done on this cyclone type because of its utility in areas like mining and agriculture. A cyclone with a square body, rather than a cylindrical one, was introduced in the previous three decades. Square cyclones are not well-known in the industrial world yet. Still, they have several advantages over conventional cyclones, including faster construction, quicker integration with boilers, and improved thermal efficiency when used with fluidized bed circulation-type boilers. This research compares the performance of square and conventional cyclones in terms of collecting efficiency and pressure drop. Factors including solid loading ratio, gas entry velocity, gas viscosity, and cyclone shape affect pressure drop and separation efficiency. According to data from published papers, conventional cyclones outperform square cyclones in terms of collection efficiency. However, simulation studies have shown that the pressure drop in a square cyclone is less than that in a cylindrical cyclone. Given that square cyclones are more straightforward to fabricate than conventional cyclones, the findings of this paper open up a lot of room for more research into developing square cyclones that can equal the performance of conventional cyclones. © 2022

关键词： Pressure drop

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The factors influencing digital literacy of vocational high school teachers in Yogyakarta 2

The factors influencing digital literacy of vocational high ...

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2nd International Conference on Vocational Education of Mechanical and Automotive Technology, ICoVEMAT 2019

作者： Warno, K. Study Program of Fashion Engineering Education Faculty of Engineering Universitas Negeri Yogyakarta Indonesia

The purpose of this study is to reveal the condition of teachers' digital literacy and the effect of the achievement motivation towards digital literacy among Tourism vocational teachers in Yogyakarta based on age generation, i.e the generation differences of Baby Boomers, X and Y. This research belongs to ex-post-facto with a quantitative approach. The research subjects were 130 teachers consisting of teachers from state tourism vocational schools in Yogyakarta. The results showed that the majority of digital literacy among tourism vocational teachers can be categorized as medium and the variable of achievement motivation plays a significant influence on digital literacy. Moreover, there was a significant influence from the facilities that were used by the teachers towards their digital literacy. Also, there were differences in teachers' digital literacy among teachers who were born in the baby boomers generation, X and Y generation. It means that the variable age generation of teachers can improve the digital literacy skills of vocational school teachers in the field of tourism. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Motivation

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Maintenance Management of Welding engineering Workshops in Vocational High Schools Inspecial Region of Yogyakarta 1

Maintenance Management of Welding Engineering Workshops in V...

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1st International Conference on Vocational Education of Mechanical and Automotive Technology, ICOVEMAT 2018

作者： Jarwono, Tri Ardian, Aan Mechanical Engineering Education Study Program Faculty of Engineering Yogyakarta State University Indonesia

This study aimed at investigating the maintenance management of welding engineering workshops and factors affecting the damage of welding equipment in vocational high schools located in Special Region of Yogyakarta. The study employed quantitative descriptivedesign. It was conducted at vocational high schools SMKN 1 Sedayu, SMKN 2 Pengasih, SMK Muhammadiyah 2 Wates, and SMKN 1 Pundong. The respondents were heads of workshops, teachers of welding engineering subject, workshop technicians, and students. The data were collected through survey, observation, and interview. The quantitative descriptive technique was employed to analyze the collected data. The results of the study show that the maintenance management of welding engineering workshops in some VHS in Yogyakarta is Very Gooddespitesome problemsin the maintenance procedure. The factors causing the equipment damage are the unscheduled maintenance procedure, absence of inventory lists, lack of technicians, improper use of workshop equipment, and the limited amount of maintenance budget. © Published under licence by IOP Publishing Ltd.

关键词： Maintenance

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Developing the Indonesian Qualifications Framework's descriptors for Electrical engineering as the basis of the Recognition of Prior Learning (RPL)

Developing the Indonesian Qualifications Framework's descrip...

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International Conference on Electrical, Electronic, Informatics and Vocational Education 2018, ICE-ELINVO 2018

作者： Zamtinah Supriyadi, E. Electrical Engineering Education Study Program Faculty of Engineering Yogyakarta State University Indonesia

This study aims to: 1) describe the mechanism of the level 2 IQF (the Indonesian Qualifications Framework) descriptor development for electrical engineering, and 2) formulate a set of detailed-level-2 descriptors for electrical engineering. The method used to develop the descriptors is brainstorming between the researcher and several experts from both academicians and practitioners. Meanwhile, the method to formulate the IQF descriptors for electrical engineering is literature review referring to The Indonesian National Work Competency Standard (SKKNI) and focus group discussion involving experts from academicians, Professional Certification Institute Gema PDKB, the Association of Indonesian Electrical Works (APEI), Consortium for Electrical Installation Safety (KONSUIL), and industry practitioners such as PT. LEN Bandung, PT. Bukaka Teknik Utama, PT. Schneider Electric Indonesia, and PT. Smart Energi Semesta. The descriptors are in the form of the guttman scale questionnaire. The questionnaire was then tested on limited-scale respondents. The KR 20 method was employed to examine the reliability and resulted in r11 = 0.9;thus, the guttman scale questionnaire was considered "very reliable". The respondents consisted of 8 academicians, 8 electrical engineering teachers at vocational high schools, and 8 industrial practitioners. The collected data were then analyzed descriptively. This study resulted in a set of level 2 IQF descriptors which were designed according to the taxonomy of electricity system, namely electric power transmission system descriptors, electric power distribution system descriptors, and electric power utilization descriptors. In regard to electric power transmission system, 103 out of 154 (67%) descriptors were approved by more than 80% of respondents;for electric power distribution system, 83 descriptors (75%) were approved by more than 80% of respondents;and for electric power utilization system, 61 descriptors (94%) were approved by more than 8

关键词： Surveys

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The effect of sea water soak on asphalt porous characteristics with and without waste of rubber tire waste as an asphalt addictive 2

The effect of sea water soak on asphalt porous characteristi...

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2nd International Conference on Green Civil and Environmental engineering, GCEE 2019

作者： Mawarni, O.S.T. Fauziah, M. Civil Engineering Study Program Faculty of Civil Engineering and Planning Universitas Islam Indonesia

The use of rubber tire scraded in the developement of porous asphalt technology as a part of flexible pavement aims to minimize the adverse effects of transportation facilities. The use of rubber tire scraded as an asphalt modifier in the pavement can provide several benefits, including reducing reflective cracking on overlays, reducing maintenance cost, increaseing resistance to new pavement cracking and rutting, increasing skid resistance an pavement age. This paper presents laboratory investigation on the effect of seawater immersion on porous asphalt performance using rubber tire scraded. Method use in laboratory investigation is based on AAPA 2004 and Bina Marga 2010. The results showed the permeability all types of mixture indicator "moderate drainage". The results of testing the Marshall characteristics showed a decrease in the value of stability, flow, and MQ in the porous asphalt mixture with Pen 60/70 asphalt and rubber asphalt as the duration of sea water immersion increased. The porous asphalt mixture using Pen 60/70 asphalt and rubber asphalt has Index of Retained Strength values which tend to decrease with increasing sea water immersion duration. Indirect Tensile Stength test results due to seawater submersion indicate a decrease in ITS value in porous asphalt mixtures with Pen 60/70 asphalt and rubber asphalt. The Cantabro test results showed an increase along with the increasing duration of seawater immersion. © Published under licence by IOP Publishing Ltd.

关键词： Tires

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