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Mendel 2024年第1期30卷 23-32页

作者： Djamari, Djati Wibowo Awaludin, Asif Halimurrahman, Halimurrahman Hartono, Rommy Hakim, Patria Rachman Wirawan, Adi Utama, Haikal Satrya Dewi, Tiara Kusuma Mechanical Engineering Study Program Sampoerna University Indonesia Research Center for Climate and Atmosphere National Research and Innovation Agency Indonesia Research Center for Satellite Technology National Research and Innovation Agency Indonesia Research Center for Aeronautics Technology National Research and Innovation Agency Indonesia

This paper considers the problem of distributed formation scaling of Multi-Agent Systems (MASs) under a switching-directed graph where the scaling of formation is determined by one leader agent. A directed-sensing graph where neighboring agents exchange their relative displacement and a directed-communication graph where neighboring agents exchange the information about formation scaling factor and velocity factors are used in this paper. One leader agent which decides the formation scaling factor as well as the velocity of the group is chosen among agents. It is shown that under a switching-directed graph, the group of agents achieves the desired formation pattern with the desired scaling factor as well as the desired group’s velocity if the union of the sensing and communication graphs contains a directed spanning tree. © 2024, Brno University of Technology. All rights reserved.

关键词： Directed graphs

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The Effect of Air Pressure in the Electric Train's (KRL) Braking System on Wheel Damage

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Journal of Physics: Conference Series 2019年第1期1273卷

作者： Akbar Zulkarnain Willy Artha Wirawan Hari Boedi Wahjono Indah Puspitasari Aldoko Railway Mechanical Engineering Study Program Indonesian Railway Academy

A flat wheel is a kind of wheel damage occurring when the train wheels are dragged along the rail as the axle wheel's rotation stops. The wheels will skid when the brake block force is greater than the train force. The equation for the wheel skid is (Fbrake > Ftrain), this applies when the wheels stop rotating, but the train still moves so that a flat spotmay appear. This study finds that the electric trains from the JR 205 seriesthat has many flat spots on its wheels are the M trains (70%). It also reveals that the percentage of the brake block pressure in the unloaded KRL is 130.4%. Provided that ɳ>ɳmax (100%), this condition does not meet the standard of the International Union of Railway or Union Internationale des Chemis de Fer (UIC). If the percentage of the brake block pressure (ɳ) exceeds 100%, the braking force will be greater than that of the axle load and this causes the skid. To overcome this condition, rechecking the braking force and providing additional equipment are needed to assure that the air pressure is controlled.

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Morphological and Permeability Fraction of Mixed Matrix Polysulfone Membrane on Batik Palembang Wastewater Treatment

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Journal of Physics: Conference Series 2021年第1期1845卷

作者： E Yuliwati Elfidiah A Melani H Porawati Graduate Program Study Program of Chemical Engineering Universitas Muhammadiyah Palembang Indonesia Program Study of Chemical Engineering Faculty of Engineering Universitas Muhammadiyah Palembang Indonesia Program Study of Mechanical Politeknik Jambi Indonesia

High performance polysulfone (PSf) membrane has been prepared for treating of batik palembang wastewater. Many investigations attempted the use of polysulfone (PSf) membranes to filtrate dilute contaminant in textile wastewater. The matrix membrane is a mixture of PSf which is produced by adding inorganic materials to obtain a polymer that functions to manufacture the membrane by increasing hydrophilicity and impurity resistance. MMM were fabricated from a dope solution containing PSf/LiCl/DMF at different additives composition. Antifouling properties of membranes could be enhance with 0.0 - 10 wt.% LiCl that has been added into dope solution. Pure water permeation flux analysis (PWP), AFM and FESEM. From the results of research on FESEM, the PSf / LiCL membrane showed a fairly symmetrical cross-sectional structure containing two layers. The layers of the tiny finger-like structure on the edge of the perforated fibers and the holes like the larger fingers are mixed with the macrovoid layer in the middle section. PWP flux is not proportional to mean rough outer surface but higher water permeation. Therefore, PSf/LiCl exhibited a better performance that resulted a much lower fouling tendency than the naked membrane in batik Palembang wastewater treatment.

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Control of Electronic Devices Using Smartphone-Based Voice Identification

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IOP Conference Series: Materials Science and engineering 2019年第2期662卷

作者： S Sriwati E Eruinsyah S Karim F Rahman Electrical Engineering Study Program Universitas Islam Makassar Indonesia Electrical Engineering Study program Universitas Islam Makassar Indonesia Mechanical Engineering Study program Universitas Islam Makassar Indonesia

This study aims to design the control system of an electronic device using voice identification-based smartphones generating electronic device control system. It optimizes the smartphone functions as a mobile phone than as a means of communication. The method used using the technique of direct observation by observing the success of the software AMR voice in identifying sound. In this design process smartphone as a sound receiver module, arduino as a controller, Bluetooth module as the sender and recipient of the data, and the relay as a contact breaker and connecting the electric current, as the output of LCD used to display information on whether the results of voice identification is correct or incorrect. Research tools electronic control device can control electronic devices such as fans, lamps and others depending on what is to be controlled. From the test results it can be concluded that the system control electronic devices by using voice identification-based smartphone that has been designed is divided into several parts, namely the Bluetooth module HC-05, arduino uno, relays and software AMR voice as a controller that has been tested to work and function properly.

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Selective surface functionalization at regions of high local curvature in graphene

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Chemical Communications 2013年第7期49卷 677-679页

作者： Wu, Qingzhi Wu, Yaping Hao, Yufeng Geng, Jianxin Charlton, Matthew Chen, Shanshan Ren, Yujie Ji, Hengxing Li, Huifeng Boukhvalov, Danil W. Piner, Richard D. Bielawski, Christopher W. Ruoff, Rodney S. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Biomedical Materials and Engineering Center Wuhan University of Technology Wuhan 430070 China Department of Mechanical Engineering Department of Materials Science Department of Engineering Program The University of Texas at Austin Austin TX 78712 1 University Station C2200 United States Department of Chemistry and Biochemistry The University of Texas at Austin Austin TX 78712 1 University Station A1590 United States School of Computational Sciences Korea Institute for Advanced Study Seoul 130-722 South Korea ) School of Chemical and Biological Engineering Seoul National University Seoul 151-742 South Korea

Monolayer graphene was deposited on a Si wafer substrate decorated with SiO2 nanoparticles (NPs) and then exposed to aryl radicals that were generated in situ from their diazonium precursors. Using micro-Raman mapping...

Monolayer graphene was deposited on a Si wafer substrate decorated with SiO₂ nanoparticles (NPs) and then exposed to aryl radicals that were generated in situ from their diazonium precursors. Using micro-Raman mapping, the aryl radicals were found to selectively react with the regions of graphene that covered the NPs. The enhanced chemical reactivity was attributed to the increased strain energy induced by the local mechanical deformation of the graphene. © The Royal Society of Chemistry.

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Maintenance Management Of Welding engineering Workshops In Vocational High Schools Inspecial Region Of Yogyakarta

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Journal of Physics: Conference Series 2019年第1期1273卷

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

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.

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Developing a Manual Arc Welding Job Sheet for the Basic Welding Technique Subject

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Journal of Physics: Conference Series 2019年第1期1273卷

作者： Galih Adityawan Riswan Dwi Djatmiko Mechanical Engineering Education Study Program Faculty of Engineering Yogyakarta State University

The study aims to describe (1) the development stages of the manual arc welding job sheet and (2) its validity. It is a Research and Development (R & D) of which the data were collected by means of non-test instruments, namely the closed-ended questionnaires with the 5-scale responses. The data were collected from the three research participants acting as the material and media experts,namely two lecturers in the mechanical engineering Education study program, Faculty of engineering (FE), Yogyakarta State University (YSU), and a teacher of the Basic Welding Technique subject. The job sheet development stages were adapted from Thiagarajan's model, namely the Four-D model covering the definition, design, development, and dissemination. Data were analyzed quantitatively by means of the descriptive statistics. The results of the material evaluation by the material expert I prove that the job sheet is categorized as Appropriate (with the total score of 145 or 82.9%) and Very Appropriate based on the material expert II with the total score of 153 (87.4%). Besides, in terms of the media, the job sheet is Appropriate based on the media expert I (with the total score of 207 or 82.8%) and Very Appropriate based on the media expert II (with the total score of 215 or 84.4%).

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Fatigue Life Prediction of 180 Ton Lifting Spreader Construction Material ST43 Using S-N Curve

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Journal of Physics: Conference Series 2021年第1期1764卷

作者： Asep Dharmanto Asep Saepudin Mechanical Engineering Study Program Sekolah Tinggi Teknologi Muhammadiyah Cileungsi

Lifting spreader construction with a maximum capability of 180 tons every day works by carrying transformer loads that vary up to maximum loads. The loads tested were 105 tons, 125 tons, 150 tons and 180 tonsThe tool not only experiences vertical tensile load but also experiences horizontal load due to acceleration or deceleration of the overhead crane. To prevent fracture due to fatigue, the lifting spreader needs to be analyzed its service life. Obtained data of mass transformers per year and construction specification will be dynamically analyzed using SAP2000 software to gain informationmaximum and minimum stress from each of its shell nodes. Data Collectionof stress will be processed through the S-N Curve mechanism and Palmsgren Miner rules to determine the cyclic load of the fatigue life plate of spreader. This analysis found that maximum capacity 180 tons value Sf above from endurance limit state. And the assessmentdecline fatigue life of the lifting spreader based data within 45 years. The researcher recommends a decrease in the value of the capacity till to 10 percent for things that are not expected that result in a decrease in the quality of construction.

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Failure Analyses on Corrosion of Hot Water Tank Storage Made from Stainless Steel

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IOP Conference Series: Materials Science and engineering 2020年第1期1007卷

作者： Tjokorda Gde Tirta Nindhia I Putu Widya Semara I Wayan Bandem Adnyana I Wayan Surata I Gusti Komang Dwijana Study Program of Mechanical engineering Engineering faculty Udayana University Jimbaran Bali Indonesia 80361 Graduate student Study Program of Master in Mechanical Engineering EngineeringFaculty Udayana University Bali Indonesia 80361

Hot water storage tank that was made from stainless still was investigated in this case. The tank was found failure in service due to corrosion in welded section. Corrosion also was found at the bottom part of the storage tank. The tank was used for no longer than one year but unfortunately severe corrosion was found. The purpose of this research is to find the reason why the tank easily corroded especially at the bottom part and at the welding section. The research was carried out by conducting metallographic examination directly in situ by utilizing portable metallographic microscope. It is found from investigation that the corrosion was happen due to galvanic corrosion. Investigation by using X ray fluorescence also agree that the composition of the bottom part of the tank was different with the wall, and upper section. The welding filler also was found not correctly prepared that make pitting corrosion to occur. It is suggested to conduct advance research to investigate the correct composition for the filler during welding.

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Using conjoint and cluster analysis in developing new product for micro, small and medium enterprises (SMEs) based on customer preferences (Case study: Lampung province’s banana chips)

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AIP Conference Proceedings 2017年第1期1867卷

作者： Wilson Kosasih Lithrone Laricha Salomon Reynaldo Hutomo 1Study Program of Industrial Engineering Department of Mechanical Engineering Faculty of Engineering University of Tarumanagara Jakarta Indonesia 2Study Program of Industrial Engineering Department of Mechanical Engineering Faculty of Engineering University of Tarumanagara Jakarta Indonesia 3Study Program of Industrial Engineering Department of Mechanical Engineering Faculty of Engineering University of Tarumanagara Jakarta Indonesia

This paper discusses the development of new products of Micro, Small and Medium Entreprises (SMEs) to identify what attributes are considered by consumers, as well as combinations of attributes that need to be analyzed into the main preferences of consumers. The purpose of this research is to increase the added value and competitiveness of SMEs through product innovation. The object of this study is banana chips produced by SMEs from the province of Lampung which it considered to be unique souvenirs of the province. The research data were collected by distributing questionnaires in Jakarta which has heterogeneous population, in order to develop banana chip’s marketing and increase its market share in Indonesia. Data processing was performed using conjoint analysis and cluster analysis. Segmentation was performed using conjoint analysis based on the importance level of attributes and part-worth of level attributes of each cluster. Finally, characteristics and consumer preferences of each cluster will be a consideration in determining the product development and marketing strategies.

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