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Tensional shear load characterization of pin-less friction stir spot welding on aluminium 1100-H12 based on varied parameters

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AIP Conference Proceedings 2024年第1期3115卷

作者： Armansyah C. Bambang Dwi Kuncoro Rahmat Wiguna Randy Firmansyah Ridwan Bambang Rianto Mechanical Engineering Study Program Faculty of Engineering Universitas Pembangunan Nasional Veteran Jl. Rs. Fatmawati Pondok Labu Jakarta Selatan DKI Jakarta 12450 Indonesia Department of Refrigeration Air Conditioning and Energy Engineering National Chin-Yi University of Technology No. 57 Sec. 2 Zhongshan Rd. Taiping Dist. Taichung 41170 Taiwan (R.O.C.) PT Tri Jaya Teknik Jalan Alternatif Jl. Krajan II Warungbambu Karawang Timur Karawang Jawa Barat 41371 Indonesia

In this study, Aluminium 1100-H12 with 1 mm thick was welded using pin-less friction stir spot welding (PFSSW) and then tested via tensional shear test to determine the tensile shear load (TSL) characteristics of its welds. The results obtained revealed that the tensile shear load of the welds was influenced by the parameter variations among revolving speed, depth of tool, and residence time. The clout of 1400 rpm revolving speed showed good properties with the highest value of TSL about 53 MPa at a depth of tool of 0.4 mm and at 9s of residence time. The middle value of TSL was confirmed at about 35 MPa through 990 rpm of revolving speed, 0.3 mm depth of tool, and 5s of residence time. Furthermore, the lowest property of TSL was found at 775 rpm of revolving speed, at 0.2 mm depth of tool, and at 9s of residence time. The results showed the influence of the depth of the tool has significant clout on the tensile shear load, especially at 0.4 mm for each set of revolving speed and residence time. Each set of dwell time to the variation of parameters has no significant clout on the tensile shear load. Good tensile shear loads can be achieved in the range of 45-53 MPa at a depth of tool of 0.4 mm and a revolving speed of 1400 rpm, where the best is 53 MPa at a residence time of 9 seconds.

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An augmented reality-based science book for junior high school students: Case study on environmental pollution and global warming topics

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AIP Conference Proceedings 2023年第1期2569卷

作者： Erni Yulianti Vita Ria Mustikasari Nurhadi Muhlisin Nor Farahwahidah Abdul Rahman Fatin Aliah Phang 1School of Education Faculty of Social Sciences and Humanities Universiti Teknologi Malaysia 81310 Johor Bahru Johor Malaysia 2Study Program of Science Education Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Malang Indonesia 3Centre for Engineering Education Universiti Teknologi Malaysia 81310 Johor Bahru Johor Malaysia

The digitalization in the 21st century has brought tremendous benefits in many aspects of human lives, including in education. It opens the door of observing the phenomena that are difficult to do in classrooms. As phenomena observation is a vital activity in learning science, the technology of augmented reality (AR) will help students digitally observe as many phenomena as possible during their learning process. In this study, a science book that is integrated with AR technology was developed. It aims to fill the gap in the literature of what components should be included in an AR-based science book, especially the learning resource that is suitable for STEAM education. The study was limited to environmental pollution and global warming topics. The results showed that the developed AR-based science book has met the eligibility criteria to be used in STEAM education. In terms of numerical viewpoint, the scores for the feasibility test were 96.09% and 97.65% respectively for the learning media and material validation. Therefore, the AR-based science book is considered as a valid learning resource from the expert assessment. In addition, teachers and students also showed positive perspectives towards the AR-integrated book.

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Analysis of Hydrogeology and Rainwater Prevention Systems at Sepo Village in Central Halmahera Regency, North Maluku

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Journal of Physics: Conference Series 2020年第4期1569卷

作者： Nurany Lukman Razak Karim Mining Engineering Study Program Faculty of Engineering Khairun University Ternate North Maluku Indonesia Mining Engineering Study Program Faculty of Engineering Muhammadiyah University Ternate North Maluku Indonesia

Mining water is one of the main problems that has a great importance on mine productivity. In mining implementation, it is necessary to study the Mining Water (Hydrogeology) system to support a good mine design. The Mining Water drainage system is a method for making work sites in the mining area always dry. Prior to mining, hydrogeological analysis and rainwater management methods are carried out. Calculation of rainfall intensity using Gumbel Probability estimation and water capture area analysis obtained CA-1 Q = 915, 35, m3 / day CA-2 Q = 1149, CA-3 Q = 141116, 01CA-4 Q = 1407.89, the form of rainwater trapping channels in the form of trapezium and pump requirements in each catchment area of 1 (one) pump each.

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Effect of oil palm fiber on physical and tribological behavior of unsaturated polyester-oil palm ash composite

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AIP Conference Proceedings 2024年第1期3213卷

作者： Diva Almira Syahrul Humaidi Nurdin Siregar Doli Bonardo Post Graduate Program (Physics) FMIPA Universitas Sumatera Utara Jl. Bioteknologi I Kampus USU Medan 20155 Indonesia Department of Physics Faculty of Mathematics and Natural Science Universitas Negeri Medan Jl. Willem Iskandar Pasar V Deli Serdang 20221 Indonesia Refrigeration and Air Conditioning Engineering Study Program Politeknik Tanjungbalai Jl. Sei Raja Sei Tualang Raso Tanjungbalai 21345 Indonesia

Preliminary studies have successfully been conducted on the physical characterization and tribological behavior of oil palm fiber-reinforced composites based on unsaturated polyester and oil palm ash. In an effort to initiate segregation of composite particles, oil palm ash was used as a segregation agent to increase the surface roughness of the material. The composite preparation method was carried out using the hand lay-up technique for 1 hour at 100 °C. Methyl ethyl ketone peroxide was used as a hardening agent to increase the hardness of the composite. The composite that contained 10 wt.% oil palm fiber reinforced unsaturated polyester-oil palm ash showed the lowest porosity and highest density values compared to the other samples. The decrease in porosity and increase in density can be attributed to the incorporation of 10 wt.% oil palm fiber, which promotes increased segregation of the composite particles, leading to an overall volume increase. Furthermore, the increase in density results in a drastic decrease in the rate of water absorption. The sample with the optimal wear level also had the lowest value compared to the other samples, and this reduction in wear and tear is supported by the high coefficient of friction it exhibits.

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Important Ways in Designing Vocational Secondary School Teacher Development Education and Training

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Journal of Physics: Conference Series 2021年第1期1737卷

作者： N Kholis E Supriyadi D Mardapi The Electrical Engineering Education Department Faculty of Engineering Yogyakarta State University Yogyakarta INDONESIA The Educational Research and Evaluation Study Program Graduate School Yogyakarta State University Yogyakarta INDONESIA

A mid-level labor preparation having the qualification and competency appropriate with working world needs is a task from vocational secondary school (VSS). Now days, VSS become an attention by wide community, as a result of the existence of government policy which is trying to empowering vocational secondary education. The policy taken is by performing the revitalization of vocational school which has the aim to improve the quality of labor competitiveness. One of the programs is teacher quality improvement through various teacher training. However, relating to this case, it is suspected that the previous vocational school teacher training is less effective, so that it needs to be conducted the analysis about the teacher training implementation. Therefore, this article will be elaborated the ways needed to be conducted in improving the educational quality and vocational school teacher development training. The ways should be considered when it is planned and implemented the effective training program, such as: determining the needs, setting the goal, determining the content of learning, selecting the participants, determining the best schedule, selecting the appropriate facilities, selecting the proper instructor, selecting and preparing the audiovisual equipment, coordinating the program and evaluating the program.

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Simulation of passive filter design to reduce Total Harmonic Distortion (THD) in Energy-Saving Lamps (LHE) and Light Emitting Diodes (LED)

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IOP Conference Series: Earth and Environmental Science 2021年第1期878卷

作者： F Susanto E M Silalahi S Stepanus B Widodo R Purba Electrical Engineering Study Program Faculty of Engineering Universitas Kristen Indonesia Jakarta Jl. Mayjen Sutoyo No.2 Cawang Kramatjati Jakarta Timur DKI Jakarta Indonesia

This paper discusses the design of a passive filter system for Energy-Saving Lamps (LHE) and Light Emitting Diodes (LED) using the MATLAB Simulink software. This type of lamp is a type of non-linear load that produces harmonics of current and voltage. However, this harmonic problem can be reduced using passive filters. To determine the size of the passive filter components, research was carried out in the form of measurements of power, power factor, voltage, current, THDi and THDv produced by the LHE and LED. The results of these measurements were simulated using MATLAB Simulink to determine the passive filter design that reduces the THD value on the LHE and LED. To reduce the level of current harmonics, a single tuned LC passive filter was designed. The filter, designed to work at a frequency of 50 Hz and is expected to reduce the level of harmonics in the 3rd, 5th, 7th, 9th, 11th harmonic orders so that the THD produced by LHE and LED meets the IEEE 519-2014 standards. The simulation results of single tuned LC passive filter design can reduce THDi by 46.78% from the initial THD of 84.55% so that it becomes 37.77%.

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Total sulfur variability analysis of coal deposits using ordinary kriging estimation

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AIP Conference Proceedings 2021年第1期2363卷

作者： Yuniar Siska Novianti Romla Noor Hakim Nurhakim Hafidz Noor Fikri Study Program Mining Engineering Faculty of Engineering Universitas Lambung Mangkurat Jl. Jenderal Achmad Yani KM 355 Banjarbaru Kalimantan Selatan - 70714 Indonesia

Coal's price collapse has become a challenge in exploring and exploiting coal deposits in the mining industry. Total sulfur is one of the coal qualities sufficiently considered in the use of coal. The Geostatistics method using ordinary kriging estimation is done to determine the total sulfur variation in the coal seam. Modelling was performed on every three meters of coal thickness using 193 samples on a seam of coal with a thickness of up to 30 meters. Geostatistical modelling is implemented on the coal seam, and it produces ten sulfur distribution models. The modelling results show clearly that in the model in the first layer, the distribution of sulfur is higher in value than other layers. These results expected can help select mining stages and exploration drilling activities in the context of increasing coal reserves.

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

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Journal of Physics: Conference Series 2020年第1期1446卷

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

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.

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Effect of soaking time in sodium metabisulfite solution on the physicochemical and functional properties of durian seed flour 24

Effect of soaking time in sodium metabisulfite solution on t...

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24th Regional Symposium on Chemical engineering, RSCE 2017

作者： Kumoro, Andri Hidayat, Jefri Department of Chemical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia Master of Chemical Engineering Study Program Faculty of Engineering Diponegoro University Semarang Indonesia

With regard to its high carbohydrate and gum contents, durian seed flour has been used as a substitute to wheat flour in butter cake and cookies manufactures. Unfortunately, processing of fruit seeds into flour may be hampered by discoloration, which may affect the nutrition and sensory quality of the food products. The objective of this study is to investigate the effect of soaking time on the physicochemical and functional properties of durian seed flour. Durian seed chips were soaked in 0.6% w/v sodium metabisulfite solution as anti-browning agent at 30°C for desired periods (40, 60, 80, 100, 120 minutes), followed by drying at 50°C for 17 hours, milling and sieving to obtain flour. The flour was analyzed for its moisture, ash, protein, fat and carbohydrate contents, sulfite residue, yield, gelatinization temperature, and water and oil absorption capacities (WAC and OAC). The results showed that longer soaking time reduced the moisture and ash content of durian seed flour, but increased most of the other studied parameters. The WAC, OAC and fat content were less affected by soaking time. It can be concluded that soaking of durian seed chips in sodium metabisulfite solution can improve the nutrition and functional properties of flour. Based on the residual sulfite content, durian seed flour obtained in this work is safe for consumption. © The Authors, published by EDP Sciences, 2018.

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The effectiveness of Indonesia's fisheries policy to reduce illegal fishing

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IOP Conference Series: Earth and Environmental Science 2021年第1期805卷

作者： E Djunarsjah D Kusumadewi G Chairuniza Hydrography Research Group Faculty of Earth Science and Technology Institut Teknologi Bandung Urban and Regional Planning Study Program Faculty of Architecture Planning and Policy Development Institut Teknologi Bandung Geodesy and Geomatics Engineering Study Program Faculty of Earth Science and Technology Institut Teknologi Bandung

The sea has economic potential such as marine tourism, energy, maritime industry, marine transportation, marine building and services, and fisheries. Indonesia has fishery resources with high biodiversity and easily accessible (renewable resources). Indonesia's fishery production reached approximately 12.6 million tonnes, of which marine catch accounted for about 6.71 million tonnes, inland capture for 0.51 million tonnes and the rest is in aquacultures. In addition, Indonesia is facing the problem of illegal fishing by foreign fishing vessels from Thailand, Vietnam, China, Malaysia, Japan, Taiwan and Cambodia. Foreign fishing vessels conducting illegal fishing are not only found in the EEZ, but also in territorial and archipelagic waters. Based on the findings of this study, the illegal fishing policy has a positive impact by reducing illegal fishing activities in the short term and increasing fisheries stocks. However, negative impacts were also found, the national fisheries business has decreased by number, especially local fishermen business, so that fishermen are unable to optimize their capture fisheries activities. Some local fishermen benefit economically from illegal fishing, this is what causes illegal fishing activities to continue. The policies that have been implemented have not been optimal in ensuring that fishermen are more prosperous. A sovereign state not only owns the territory and defends it from foreign disturbances, but must realize the welfare of its people, including fishermen. The purpose of this research is to see the effectiveness of fisheries policies in Indonesia to tackle illegal fisheries and improve fishermen's welfare. This research uses regulation analysis and Actor Network Theory to analyze the effectiveness of fishery policies

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