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study of spot welding tensile and shear strength comparison on aluminium and low carbon steel using filler

AIP Conference Proceedings 2023年第1期2680卷

作者： Davin Hengsa M. Sobron Y. Lubis Rosehan Mechanical Engineering Study Program Faculty of Engineering Universitas Tarumanagara Jl. Letjen S.Parman No. 1 Jakarta 11440 Indonesia

Alumunium and low carbon steel are some of many materials that are commonly used in machining process. One of the reasons is that Stainless steel has a high resistance towards rust, followed by a maximum shear strength of approximately 124-290 MPa. On the other hand, low carbon steel has a higher shear strength of approximately 500 MPa. In this study, spot welding process on these dissimilar materials is using filler and then analyzed using linear regression analysis, by varying voltage towards the shear strength results based on the parameters used in this research. The research was carried out using an experimental method by processing secondary data. The secondary data was then reprocessed by linear regression analysis using IBM SPSS software, The use of filler in spot welding using Aluminium 6061 and Low Carbon Steel SS400 has a positive effect on the shear tensile strength, resulting in a shear tensile strength of 923MPa with a stress of 3.5 V and a pressing time of 5 seconds.

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Designing ergonomic non-medical mask using ergonomic function deployment (EFD) method (case study: engineering faculty student, Mulawarman University)

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AIP Conference Proceedings 2023年 080002页

作者： Aprilia Prahesti Lina Dianati Fathimahhayati Theresia Amelia Pawitra Industrial Engineering Program Study Faculty of Engineering Mulawarman University. Sambaliung Street North Samarinda Samarinda City East Kalimantan Indonesia 75242

Since the outbreak of Covid-19 ***, there has been 1.739.750 positive cases and 48.039 deaths. Wearing a facemask is one important aspect to prevent the spread of the Covid-19. WHO recommended three layered cloth masks to be worn at home or public place. Based on the initial observation, there were some discomfort felt by customers including headaches, difficulty in breathing and speaking, as well as excessive sweat production on the face that lead to acne, dermatitis, and redness. This discomfort made students not using facemask properly. This study aims to design ergonomic non-medical mask that is comfortable and protective for the customers. Ergonomics Function Deployment (EFD) was applied to redesign the current cloth mask. EFD is the development of QFD (Quality Function Development) by adding a new relationship of customer needs and ergonomics aspects of the product. 376 respondents were surveyed to gather data about satisfaction of currently used mask, customer's needs and their important priority. Data collection of EFD started with preliminary-sampling to identify customer need and customer's level of importance questionnaires distribution to 376 respondents to measure the importance of each attribute of product. EFD showed that most important customer's need of non-medical mask was could protect customers from COVID-19 droplets, had several layers, ergonomically fitted to the customer's face. Four alternatives concepts were generated to fulfill customer requirements, concept A, B, and C selected to be continued. By concept scoring, concept A and B were selected with 4.695 and 4,646. Concept A (it had head loop adjustable design with round stopper; its width and height were 196.4 and 140 mm, it used zipper to open and close mask with width and height of the opening were 67 mm and 77 mm, it had black cloth and elastic string). Concept B (it had ear loop adjustable design with stripped stopper, its width and height were 196.4 and 140 mm, it used zippe

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Textural Features for Blb Disease Damage Assessment in Paddy Fields Using Drone Data and Machine Learning: Enhancing Disease Detection Accuracy

SSRN

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SSRN 2024年

作者： Wijayanto, Arif Kurnia Prasetyo, Lilik Budi Hudjimartsu, Sahid Agustian Sigit, Gunardi Hongo, Chiharu Department of Forest Resource Conservation and Ecotourism Faculty of Forestry and Environment IPB University Bogor16680 Indonesia Ronpaku Fellow Tokyo102-0083 Japan Environmental Research Center IPB University Bogor16680 Indonesia Study Program of Information Technology Faculty of Science and Engineering Ibn Khaldun University Bogor16129 Indonesia Regional Office of Food Crops Service West Java Province Cianjur43283 Indonesia Chiba University Chiba263-8522 Japan

Detecting Bacterial Leaf Blight (BLB) in paddy fields is one of the essential issues in Indonesia to prevent losses in rice production. This study reports the effectiveness of textural analysis using drone-acquired data over paddy fields in West Java, evaluating the potential of integrating textural and thermal characteristics. We used drone data combined with machine learning techniques to distinguish different levels of BLB impact. The normalized difference texture index derived from Haralick textural features was used as a predictor. The findings revealed that incorporating textural features enhanced the disease detection accuracy significantly compared with the traditional approach based on spectral indices. The random forest algorithm, which merges texture and vegetation indices, achieved a classification accuracy of 0.984. The proposed method offers a robust, noninvasive solution for BLB disease detection, contributing substantially to safeguarding crop yields and mitigating global food security issues. © 2024, The Authors. All rights reserved.

关键词： Drones

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Fuzzy controller simulation for micro hydro generator load control using Simulink Matlab

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AIP Conference Proceedings 2023年第1期2601卷

作者： Abdul Hafid Adriani Adriani Rahmania Rahmania Electrical and Telecommunication Engineering Study Program Faculty of Engineering University of Muhammadiyah Makassar Jl. Sultan Alaudin no. 259 Makassar 90221 Indonesia

This paper presents the results of research on fuzzy controller simulation for load control of a 5 kW micro-hydro generator using Simulink Matlab. The model uses two input variables and one fuzzy output variable. The controller input variables are consumer power and TRIAC trigger angle while the output is the generator frequency prediction. Based on the simulation results of 41 samples of consumer power used in the simulation, it is found that there are only 4 powerpoints that cause the generator frequency to be outside the specified tolerance limit. Generally, the electric power system in Indonesia uses a frequency of 50 Hz, with a tolerance of±0.4 % or a frequency between 49.8 Hz-50.2 Hz. Overall, it can be said that the performance of the fuzzy controller for controlling the load of the 5 kW micro-hydro generator reviewed in this study has a fairly good performance.

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Content design: E-learning module for study on cultural tourism information systems based on local wisdom 2

Content design: E-learning module for study on cultural tour...

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

作者： Pageh, I.M. Permana, A.A.J. Historical Education Faculty of Law and Social Sciences Ganesha University of Education Singaraja Indonesia Information Technology Department Informatics Management Study Program Faculty of Engineering and Vocational Ganesha University of Education Singaraja Indonesia

Facing the 4.0 industrial revolution, it is necessary to carry out reforms and innovations related to national education. Reforms and innovations in the implementation of components of the education system involve changes in curriculum, graduate competencies and assessments, teacher qualifications, funding, facilities and infrastructure, decentralization and educational autonomy. Bali as a world tourist destination must be maintained and passed on to the younger generation. The younger generation can use information technology to help promote Balinese culture. Bali has a lot of local wisdom that can be implemented in the tourism sector. Therefore to promote those local wisdoms, a module that can be accessed through e-learning is developed to help students develop a cultural tourism package based on local wisdom to be promoted online. The modules developed have been tested by content and media experts, which can be used independently by students. Modules can be accessed online at e-learning and they are ready to use instructions for students so they can work on assignments and projects independently. Modules containing this theory and practice are for making brochures, tour packages, videos, and websites, all of which are connected to promote tourism based on local Balinese wisdom. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Students

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Review on cold-formed steel beam-column, apex and eaves, and truss joint

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AIP Conference Proceedings 2024年第1期3116卷

作者： R. M. Fadel Satria Albimanzura Anis Saggaff Mahmood Md Tahir Kiagus Muhammad Aminuddin Doctoral Student of Engineering Science Study Program Doctoral Faculty of Engineering Sriwijaya University Indralaya Indonesia Civil Engineering Faculty of Engineering Sriwijaya University Indralaya Indonesia Institute for Smart Infrastructure and Innovative Construction (ISIIC) Construction Research Centre (CRC) School of Civil Engineering University Teknologi Malaysia Johor Bahru Malaysia

Light steel framing using the Cold-Formed Steel (CFS) sections is one of the Industrialized Building Systems (IBS) highly recommended for our construction industry; it not only contributes to speeding up construction time and reducing material usage but also guarantees the quality of the building. A relentless study has been conducted to achieve the appropriate configuration to ensure CFS popularity by introducing different types of joints applicable in constructing lightweight steel framing. A review of the CFS joint is provided in this study. The CFS joint is focused on the beam-column joint, apex and eaves, and truss joint. The study is mapped to establish research trends on CFS joints. Some areas show limited study and need future research on the proposed joints’ structural behavior aspects.

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Integration of Satellite-Derived Bathymetry and Sounding Data in Providing Continuous and Detailed Bathymetric Information 2

Integration of Satellite-Derived Bathymetry and Sounding Dat...

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2nd Maritime Science and Advanced Technology: Marine Science and Technology in Framework of The Sustainable Development Goals, MSAT 2019

作者： Hashim, Nur Syahirah Yusof, Othman Mohd Windupranata, Wiwin Sulaiman, Saiful Aman Hj. Centre of Studies for Surveying Science and Geomatics UiTM Shah Alam Malaysia Geodesy and Geomatics Engineering Study Program Faculty of Earth Science and Technology Institute Technology of Bandung Indonesia

A hydrographic survey can be a cumbersome sometimes. The data can be sparse, providing it can be costly, and it took a lot of manpower and time. Space-borne data like multispectral images can be a helpful tool towards hydrographic survey, especially in the shallow water area. The company like EOMAP and TCARTA make use of Satellite-Derived Bathymetry (SDB) as a tool and product. Would it be great if it also can be applied in Malaysia, especially on the low-risk job or survey planning? Enlarging the survey area and providing a continuous and detailed water depth information is the main objective in this research. In order to complement with convenience and cost reduction, the author used Landsat 8 "(free downloadable images)"in this research. Structuring the procedure is the central part of the process involving pre-processing and processing step until the final product obtained. In this research, the author used various kind of bathymetry algorithms such as Single-Band Algorithm (SBA), Green-Band Algorithm (GBA), and Stumpf. Moreover, the author also uses Principal Component Analysis (PCA) tool from ArcMap and Spear Relative Water Depth: Log-Ratio Transform tool from ENVI to derived bathymetry. All of this bathymetry algorithm gives out a different concept with a different statistical approach. The final result then will be compared and evaluated with Single-Beam Echosounder data (ground truth). © Published under licence by IOP Publishing Ltd.

关键词： Satellites

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Preparation of activated carbon derived from water hyacinth as electrode active material for li-ion supercapacitor 16th

Preparation of activated carbon derived from water hyacinth ...

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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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Characteristics of primary tin mineralization in the Central and West Bangka Island 3

Characteristics of primary tin mineralization in the Central...

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3rd Life and Environmental Sciences Academics Forum, LEAF 2019

作者： Aditya, R. Setiawan, I. Nugraheni, R.D. Sihombing, F.M.H. Indra, T.L. Universitas Indonesia Depok16424 Indonesia Bandung40135 Indonesia Geology Engineering Study Program Faculty of Earth and Energy Technology Universitas Trisakti Jakarta Barat11440 Indonesia

Bangka Island is an important tin producer in Indonesia, mostly from the secondary tin deposits. However, the secondary tin deposit is depleting, causing further exploration shifted to the primary tin mineral. The purpose of this study is to make a mineralization model of primary tin deposit in Bangka Island. Methods that implemented in this study are petrographic analysis, mineragraphic analysis, XRD (X-Ray Diffraction), and XRF (X-Ray Fluorescence) analysis. The studied rock samples that consisted of granite, meta-sandstone, and sandstone. Some of the rocks are altered rocks with varying intensity. Petrographic and mineragraphic analysis show the presence of minerals that indicate the primary tin deposits, such as cassiterite, tourmaline, topaz, sericite, pyrite, and sphalerite. XRF analysis shows data about the value of Sn elements so that they can be classified into two classes, very high grade (> 800 ppm), and low grade (100-200 ppm). XRD analysis is necessary to do to determine the type and intensity of alterations that occur in the study area. The results of each analysis will provide supporting information regarding the primary tin mineralization process in Bangka Island. © Published under licence by IOP Publishing Ltd.

关键词： Pyrites

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Compatible composites filaments based on PHB/starch for 3d printing via fused deposition modeling

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Biotechnology for Sustainable Materials 2025年第1期2卷 1-11页

作者： Esper, Lorena Brandão Batista, Igor Tadeu Silva dos Santos, Molíria Vieira Ribeiro, Clovis Augusto Finocchio, Henrique Amaral, André Capaldo da Silva Barud, Hernane Biopolymers and Biomaterials Group Postgraduate Program in Biotechnology University of Araraquara (UNIARA) Araraquara Brazil SUPERA Innovation and Technology Park of RibeirãO Preto Ribeirão Preto Brazil BioSmart Nanotechnology Ltda Araraquara Brazil State University of Campinas (UNICAMP) Faculty of Chemical Engineering São Paulo Brazil Institute of Chemistry São Paulo State University (UNESP) Araraquara Brazil Afinko Polymer Solutions Ltda São Paulo Brazil

The increasing interest in biopolymers for fabricating biomaterials via 3D printing is driven by their biodegradability, biocompatibility, and non-toxic properties. Polyhydroxybutyrate (PHB) has emerged as a promising candidate, particularly for tissue engineering applications. However, its high production cost and inherent limitations, such as low mechanical strength and thermal instability, hinder broader adoption. To address these challenges, PHB can be blended with natural additives or biopolymers like starch and cellulose to improve its properties. In this study, 3D printing filaments were developed using PHB-starch blends, leveraging a custom-made extruder to produce flexible and homogeneous filaments. These filaments demonstrated suitable printability in Fused Deposition Modeling (FDM) 3D printers, enabling the fabrication of three-dimensional structures. The resulting composites exhibit enhanced performance characteristics, making them attractive for biomedical applications. This work underscores the potential of PHB in advancing sustainable and functional materials for 3D printing.

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