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Online learning based on the viewpoint of electrical engineering department students

AIP Conference Proceedings 2023年第1期2646卷

作者： Yuli Sutoto Nugroho Faried Wadjdi Suprapto Agus Hariyanto Electrical Engineering Department Universitas Negeri Surabaya Surabaya Indonesia Electrical Engineering Study Program Universitas Negeri Jakarta Jakarta Indonesia Civil Engineering Department Universitas Negeri Surabaya Surabaya Indonesia Sports Science Department Universitas Negeri Surabaya Surabaya Indonesia

Online learning has become a new trend during the Covid-19 pandemic. These affect a lot of the students. The viewpoints of students from the Electrical engineering Department (JTE) Universitas Negeri Surabaya (Unesa) are important to increase the quality of online learning in the future. The purpose of this research is to find out the students' viewpoint regarding (1) online learning that has been running; (2) Eligibility of online learning to continue after the covid-19 pandemic; (3) Student opinion for the improvement of online learning in the future. The method used in this research is descriptive qualitative, by distributing questionnaires. The total respondents of this research are 90 students from JTE. The results of this study indicate that JTE students are satisfied with the online learning that has been carried out. Therefore, they hope to continue this even though the covid-19 pandemic is over. In conclusion, online learning in JTE has been good even though there are various opinions for future improvements.

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Wetting challenges in treatment of raw textile wastewater by membrane distillation: A case study

Case Studies in Chemical and Environmental Engineering

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Case Studies in Chemical and Environmental engineering 2025年 11卷

作者： Rodrigues, Mariana E. Cucciniello, Raffaele Farinha, Andreia Vrouwenvelder, Johannes Fortunato, Luca Biological & Environmental Science & Engineering Division (BESE) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Environmental Science & Engineering Program (EnSE) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Dipartimento di Chimica e Biologia Università di Salerno Via Papa Paolo Giovanni II Fisiciano SA 84100 Italy Department of Biotechnology Faculty of Applied Sciences Delft University of Technology Van der Maasweg 9 HZ Delft 2629 Netherlands Department of Civil Building and Environmental Engineering University of Napoli Federico II Via Claudio 21 Napoli 80125 Italy

This case study investigated the effectiveness of Direct Contact Membrane Distillation (DCMD) in treating real textile wastewater. Textile wastewater treatment presents a critical challenge in the field of environmental sustainability, requiring innovative approaches for its treatment to mitigate adverse impacts on ecosystems. DCMD emerges as a promising solution for the treatment and reuse of textile wastewater. However, the intricate composition of real textile wastewater represents a major bottleneck for the process, as the effectiveness of DCMD is influenced by numerous factors, complicating its application. In this study, experiments with an untreated sample demonstrate the detrimental impact of suspended solids on membrane performance. The application of simple pretreatment steps prior to DCMD, involving sedimentation and filtration, substantially enhanced the quality of the permeate, resulting in 100 % color removal, 99.99 % turbidity removal, and considerable removal rates for Chemical Oxygen Demand (COD) and Total Organic Carbon (TOC). Nevertheless, wetting remained a significant issue, as evidenced by the persistence of commonly used volatile organic contaminants and surfactants in the textile industry detected within the permeate. The findings in this case study reinforce that DCMD holds promise for textile wastewater treatment but emphasize the necessity of pretreatment and wetting mitigation strategies to fully unlock its potential. This research offers crucial insights for future MD applications in addressing the complexities of textile wastewater treatment. © 2025 The Authors

关键词： Direct contact membrane distillation (DCMD) Industrial wastewater reuse Membrane wetting Optical coherence tomography (OCT) Pretreatment strategies Textile wastewater treatment Volatile organic contaminants

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Synthesis activated carbon from shell of Elaeis guineensis Jacq and modified with magnetite (AC-Fe3O4) as adsorbent for waste metal ion Pb(II) in waters

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AIP Conference Proceedings 2024年第1期2970卷

作者： A. S. Zulaicha Buhani A. R. Nuralita A. Setiajaya Cosmetic Engineering Study Program Faculty of Sciences Sumatera Institute of Technology Jl. Terusan Ryacudu Way Huwi Jati Agung South Lampung 35365 Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences University of Lampung Jl. Sumantri Brojonegoro No 1 Bandar Lampung Lampung 34154 Indonesia Environmental Engineering Study Program Faculty of Sciences Sumatera Institute of Technology Jl. Terusan Ryacudu Way Huwi Jati Agung South Lampung 35365 Indonesia

In this study, the manufacture of palm shell activated carbon was obtained from PT Inti Sentosa Alam Bahtera (ISAB) Lampung. The content of cellulose is quite large, namely 45% and hemicellulose 26%, which causes this oil palm shell to be used as a basic material for making activated carbon. This study proposes to modify activated carbon using magnetite (AC-Fe3O4). Modified physical-chemical activated carbon is exhausted as an adsorbent which has the advantage of facilitating the filtration or separation process with the adsorbate. The adsorbent test used an adsorbate in the form of heavy metal ions Pb(II). The XRD characterization of AC-Fe3O4 has intensity peaks at 2θ at 30, 35, 43, and 56° which are consistent with the XRD pattern of magnetite. SEM-EDX characterization was also carried out to see differences in morphology and elemental composition between unmodified activated carbon and AC-Fe3O4. Then the external range analysis was carried out using the BET (surface area) method. As well as identification of the amount of metal ions Pb(II) adsorbed using Atomic Absorption Spectrophotometry (AAS). The test results on the adsorbent (AC-Fe3O4) were carried out at the optimum variation, namely the adsorbent dose of 0.1 grams, contact time of 120 minutes, and at a dilution of 300 mg/L. Based on the zeta potential, the pH of PZC was obtained, namely 6 as the pH of the adsorbate solution with a Q value (number of Pb(II) ions adsorbed) of 6.175 mg/g. Adsorption isotherms tend to follow the pattern of Freundlich adsorption isotherms.

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Unlocking gold recovery: Optimizing leaching process from tailing sluice boxes with HCl pretreatment and cyanide concentration variations

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AIP Conference Proceedings 2024年第1期3167卷

作者： Tri Wahyuningsih Dyah Probowati Yasmina Amalia Ari Mulyadi Chandra Yoga Prathama Metallurgical Engineering Study Program Department of Mining Engineering Faculty of Mineral Technology UPN "Veteran" Yogyakarta Sleman Yogyakarta Indonesia PT. Global Mineralium Corporindo Jl. Kalasan Cangkringan KM 05 Duri Tirtomartani Kalasan Sleman Yogyakarta Indonesia

Tailing sluice box still contains 4.96 gpt of gold. Samples were taken for XRD and SEM-EDX testing. The XRD test results show that quartz is the dominant mineral, followed by clay and feldspar. Quartz mineral content is 46.87%, clay mineral content is 17.76% and feldspar mineral content is 27.80%. The clay mineral content which tends to be high affects the leaching process which makes the reaction take longer. The results of the diagnostic leach test using HCl solution and cyanide solution resulted in 39% Au gain. The results of the HCl pretreatment on the tailings grain size -150, -200, and -270 mesh got Au gain percentage of 23.6%, 29.6%, 44%. Tailings leaching with variations in cyanide concentrations of 500 ppm, 750 ppm and 1000 ppm resulted in gold recovery of 0.8%, 5.8%, and 7.8%. The highest gold gain was at - 270mesh size and 1000ppm cyanide concentration with 72 hours leaching time.

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Analysing the choice and pattern of needs of transportation mode for domestic tourists in Bali

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IOP Conference Series: Earth and Environmental Science 2021年第1期673卷

作者： I G N P Wiradnyana P A Suthanaya D M P Wedagama A A G A Yana D Dissanayake Doctor of Engineering Study Program Faculty of Engineering Udayana University Department of Civil Engineering Faculty of Engineering Udayana University School of Engineering Newcastle University Newcastle upon Tyne UK

Travel behaviour of domestic tourists concerning their choices of transportation mode has a significant role in managing traffic in the tourist destination. This study analyses the domestic tourists' choice and their pattern of needs of transportation mode in Bali as the case study. The developed models are based on utility maximisation of underlying preferences for each of the available modes of transport. Domestic tourists are randomly selected and interviewed using the questionnaire to record their daily trips. The study result indicates that income, number of visits and travel companions significantly influence the choice of transportation mode for domestic tourists. Meanwhile, income, number of visits, length of stays, trip purpose and main issues in selecting local transport mode significantly affect the pattern of needs of transportation mode for domestic tourists. For example, two accompanying persons will be three times more than that of seven persons or more to choose motorcycle and bus than a car. Domestic tourists who have visited Bali twice will be three times more than those who visited Bali once to use travel agents and rented vehicles than public and online transport and others. Further studies on short duration trips and sustainable mode of transport are suggested.

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Performance of solar panels as electricity source to burn rice powder in the biomass gasification process

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AIP Conference Proceedings 2023年第1期2828卷

作者： Suliono Dedi Suwandi Muhammad Luthfi Felix Dionisius Dori Yuvenda Mechanical Engineering Study Program Indramayu State Polytechnic. Legok Indramayu District West Java 4525 Indonesia Department of Automotive Engineering Faculty of engineering Universitas Negeri Padang. Campus UNP Air Tawar West Padang 25171 Indonesia

Currently, energy needs are one of the sources of human life that cannot be separated. Energy can be classified into two, energy sourced from fossils of living things and plants, with high rice production, making gasification tools an alternative to the use of rice husks into energy. Gasification is a thermochemical process of converting solid fuels into gas thus gasification using this resource is itself a renewable energy. This research is experimental. The air flow rate valve is set at speed = 2.2 m/s for the glowplug variation 3, 2.5m/s for the glowplug variation 4, 2.6m/s for the glowplug variation 5, 2.9 m/s for the glowplug variation 6 with Air Fuel Ratio (AFR)) 0.7%, 0.8%, 0.9%, 1%. With the glowplug variation, the highest temperature is up to 888°C with 1% AFR.

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Experimental study on the effectiveness of finger joint with variations in wood species toward bending strength of glulam beams 7

Experimental study on the effectiveness of finger joint with...

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7th International Conference on Sustainable Future for Human Security in conjunction with 3rd International Conference on Green Development in Tropical Regions, ICGDTR 2018

作者： Anshari, B. Rofaida, A. Mahmud, F. Pathurahman Rahmalia, R. Master Program of Civil Engineering Faculty of Engineering Mataram University Jl Majapahit 62 Mataram NTB Indonesia Department of Civil Engineering Faculty of Engineering Mataram University Jl Majapahit 62 Mataram NTB Indonesia Department of Civil Engineering Faculty of Engin Mataram University Jl Majapahit 62 Mataram NTB Indonesia

Recently, the utilization of timber as building materials was very promising for now and future. As renewable resources they have high mechanical properties, lightweight, environmentally friendly and economic. One of the most durable engineered wood products is glued-laminated timber which commonly called Glulam. Glulam is a material made of several layers of wood glued together with waterproof adhesive at specific pressure and temperature. The benefit of Glulam is enable to produce the structural member with longer span compared with solid wood. In other to obtain the structural Glulam with longer span, it required the finger joint connection on lamina layer. This study aims at to find out the effectiveness finger joint with variation in wood species towards flexural properties of Glulam beam. Experimental study have been done by using local wood Sengon and Rajumas as laminae and Biomatex as adhesive, at 0.6 MPa of clamp pressure. The variation of finger joint slope was tested are 1:8;1:12;and 1:16. The result show that the glulam Sengon and Rajumas beam with slope finger joint of 1 over 12 produce the highest average bending strength of 299 kg/cm2 and 318 kg/cm2 respectively. The flexural strength of glulam Rajumas was 20% higher compared with glulam Sengon. © Published under licence by IOP Publishing Ltd.

关键词： Bending strength

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Fast fashion technology and products: Student perceptions of Universitas Negeri Yogyakarta

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AIP Conference Proceedings 2023年第1期2590卷

作者： Resi Sepsilia Elvera Moh. Adam Jerusalem Laila Nurul Himmah Chytra Mahanani Fashion Design Study Program Faculty of Engineering Universitas Negeri Yogyakarta Jalan Karang Gayam Caturtunggal Depok Sleman Regency Special Region of Yogyakarta 5528 Indonesia

The rapid advancement of information technology requires us to always keep abreast of the times in the current global era, the ease of information from various technologies, especially internet technology in internet access services so that it directly facilitates information about fast fashion products that provide many advantages and convenience in following the latest fashion trends. especially youth fashion among students as part of self-existentialization efforts, thus making them behave consumptively. The aims of this study are (1) to find out the latest technology in fast fashion (2) to find out what factors influence students' consumption behavior towards fast fashion. In this study, the population was UNY students, with a sample size of 382 students who were taken randomly. This type of research is descriptive with a quantitative approach. This research took place from February 2021 - June 2021. The measuring instrument used was a questionnaire in the form of a questionnaire with statements consisting of fast fashion consumption behavior. Questionnaires were distributed to respondents online. The results of the study show that (1) internet technology through social media significantly influences buying decisions for fast fashion products. (2) consumer behavior based on the theory of planned behavior in terms of Attitude Toward Behavior, Subjective Norm, Perceived behavior control on average, female undergraduate students of the faculty of engineering, who are between the ages of 20 have a higher tendency to consume fast fashion products. The measuring instrument used was a questionnaire in the form of a questionnaire with statements consisting of fast fashion consumption behavior. Questionnaires were distributed to respondents online. The results of the study show that (1) internet technology through social media significantly influences buying decisions for fast fashion products. (2) consumer behavior based on the theory of planned behavior in terms of Att

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Magnetic mineral concentration and microcrystalline characteristics of Fe-rich coastal sand from North Sulawesi

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AIP Conference Proceedings 2023年第1期2694卷

作者： Gerald Tamuntuan Ping A. Angmalisang Adey Tanauma Seni H. Tongkukut Hanny F. Sangian Agnes T. Mandagi Silvia J. Fajar Dolfie P. Pandara Guntur Pasau Ferdy Ferdy As’ari As’ari Department of Physics Sam Ratulangi University Manado 95115 Indonesia Marine Science Study Program Sam Ratulangi University Manado 95115 Indonesia Department of Civil Engineering Sam Ratulangi University Manado 95115 Indonesia Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia

Magnetic mineral concentration, especially from the iron oxide class, is one of the important indicators in determining the potential iron sand natural resources. In this study, the magnetic measurement as well as X-ray spectroscopy analysis have been carried out in order to determine the concentration and microcrystalline characteristics of iron sand originating from four locations in the coastal area of North Sulawesi which are Lolan, Lalow, Hais, and Minanga. Magnetic properties study through measurement of saturation isothermal remanent magnetization (SIRM) confirmed by oxide composition obtained from X-ray fluorescence (XRF) observation showed that the iron sand sample from Lolan had the highest concentration of iron oxide minerals followed by samples from Hais, Lalow, and Minanga respectively. The percentage of iron oxide at these sites varied between 60.33 – 76.70 wt.%, implying that it was relatively competitive compared to the samples from other localities in Indonesia. Findings related to variations in crystal size and degree of crystallinity are closely related to the source and mechanism of iron sand formation at each study site.

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Stress analysis of flying V-like non-conventional aircraft structures using finite element method

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AIP Conference Proceedings 2023年第1期2941卷

作者： Julius I. Permana Annisa Jusuf Bambang K. Hadi Arief Yudhanto Aerospace Engineering Study Program Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung (ITB) Ganesha 10 Bandung 40132 Indonesia Lightweight Structures Research Group Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung (ITB) Ganesha 10 Bandung 40132 Indonesia Mechanics of Composites for Energy and Mobility Laboratory Mechanical Engineering Program Physical Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia

The stresses that occurred on the structures of a flying wing aircraft exemplified by the Flying-V structures (inspired by the design of Dr. Justus Benad of TU Delft) were evaluated using the finite element method to ensure a safe cruise condition. Two materials, i.e., aluminum alloy and carbon/epoxy composites, were defined in the analysis of the conceptual sub-structures (frame, longeron-stringer, spar-fuselage, ribs, spar wing, and upper and lower skin). These conceptual sub-structures do not necessarily represent the actual design of the Flying-V, although they may be adopted as the initial step. Structural optimization was performed with two objectives: (i) to minimize the sub-structural thickness of fully aluminum aircraft and (ii) to minimize the sub-structural thickness and laminate stacking sequence of fully composite aircraft. To this end, the stresses and wing-tip deflection were minimized. The analysis showed that carbon/epoxy composite is a feasible material to minimize the wing-tip deflection and weight compared to the aluminum alloy. The minimization of wing-tip deflection and weight was possible using a composite lay-up of quasi-isotropic, either (0/45/-45/90)s or (0/45/90/-45)s. Here, the finite element analysis provides a path to further the structural optimization of the non-conventional flying wing aircraft.

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