Journal of Engineering and Technological Sciences最新文献_第8页

Design Optimization of Propellant Grain and Nozzle Contour to Improve Performance of Solid Rocket Propulsion 提高固体火箭推进性能的推进剂药粒和喷管外形优化设计

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Journal of Engineering and Technological Sciences Pub Date : 2022-09-15 DOI: 10.5614/j.eng.technol.sci.2022.54.5.8

Muhammad Ihsan Abyan, A. Nuryaman, B. Jihad, Soleh Junjunan, A. Asmiati

引用次数: 0

A Study on Small Vehicle Structure in Rear Under-Ride Impact by Using A CAE Based Methodology 基于CAE方法的小型汽车后底盘碰撞研究

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Journal of Engineering and Technological Sciences Pub Date : 2022-09-15 DOI: 10.5614/j.eng.technol.sci.2022.54.5.11

Nguyễn Phụ Thượng Lưu, L. H. Anh

{"title":"A Study on Small Vehicle Structure in Rear Under-Ride Impact by Using A CAE Based Methodology","authors":"Nguyễn Phụ Thượng Lưu, L. H. Anh","doi":"10.5614/j.eng.technol.sci.2022.54.5.11","DOIUrl":"https://doi.org/10.5614/j.eng.technol.sci.2022.54.5.11","url":null,"abstract":"This study simulated and evaluated the safety of a small car structure in a collision with the rear of a truck. The parameters of bumpers currently used in Vietnam were employed to build a model of the rear truck bumper. The setting of simulation conditions was based on the NCAP (New Car Assessment Program) crash test. According to actual crash conditions, a collision simulation was performed with different vehicle speeds from 40 to 60 km/h, corresponding to the case of a passenger vehicle moving in a city colliding with a truck standing still. In addition, the percentage of rear-end collision was also taken into account, just like in real-world collisions, at 25%, 50%, and full rear impact. The simulation results were analyzed and evaluated according to the IIHS rating (Institute Insurance for Highway Safety). The results from different case studies showed that the rear bumper typically used on trucks is only safe for passenger cars in a collision at a low speed of 40 km/h and that in a collision at a higher speed will affect the passenger’s safe space and cause high injuries and casualties. Therefore, it is necessary to improve safety by optimizing the rear bumper design and the frontal structure of the small car chassis.","PeriodicalId":15689,"journal":{"name":"Journal of Engineering and Technological Sciences","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41442028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Improved Capillary Pressure Model for Fractal Porous Media: Application to Low-Permeability Sandstone 一种改进的分形孔隙介质毛细压力模型:在低渗透砂岩中的应用

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Journal of Engineering and Technological Sciences Pub Date : 2022-09-07 DOI: 10.5614/j.eng.technol.sci.2022.54.5.7

Muhammad Saafan, M. Mohyaldinn, K. Elraies

{"title":"An Improved Capillary Pressure Model for Fractal Porous Media: Application to Low-Permeability Sandstone","authors":"Muhammad Saafan, M. Mohyaldinn, K. Elraies","doi":"10.5614/j.eng.technol.sci.2022.54.5.7","DOIUrl":"https://doi.org/10.5614/j.eng.technol.sci.2022.54.5.7","url":null,"abstract":"Capillary pressure is a crucial input in reservoir simulation models. Generally, capillary pressure measurements are expensive and time-consuming; therefore, there is a limitation on the number of cores tested in the laboratory. Accordingly, numerous capillary pressure models have been suggested to match capillary pressure curves and overcome this limitation. This study developed a new fractal capillary pressure model by depicting the porous system as a bundle of tortuous triangular tubes. The model imitates the pores’ angularity, providing a more accurate representation of the pore system than smooth circular openings. Moreover, triangular tubes allow the wetting phase to be retained in the tube’s corners. A genetic algorithm was employed to match the capillary pressure curves and obtain the proposed model’s parameters. Capillary pressure data of eight low-permeability sandstone samples from the Khatatba formation in the Western Desert of Egypt were utilized to test the proposed model. The results revealed that the developed model reasonably matched the laboratory-measured data.","PeriodicalId":15689,"journal":{"name":"Journal of Engineering and Technological Sciences","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44132378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Microplastics in wild clams harvested from coastal waters of Lamongan, Indonesia 从印度尼西亚拉蒙干沿海水域收获的野生蛤蜊中的微塑料

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Journal of Engineering and Technological Sciences Pub Date : 2022-09-06 DOI: 10.5614/j.eng.technol.sci.2022.54.5.6

M. Asadi, F. Iranawati, Fairus Nafidya, Supriyadi Supriyadi, A. Talukder

{"title":"Microplastics in wild clams harvested from coastal waters of Lamongan, Indonesia","authors":"M. Asadi, F. Iranawati, Fairus Nafidya, Supriyadi Supriyadi, A. Talukder","doi":"10.5614/j.eng.technol.sci.2022.54.5.6","DOIUrl":"https://doi.org/10.5614/j.eng.technol.sci.2022.54.5.6","url":null,"abstract":"The contamination of microplastics have been reported in a wide array of marine organisms, including bivalve molluscs. This study aimed to investigate the occurrence and abundance of microplastics in bivalves from coastal waters of Paciran, Lamongan, East Java, Indonesia. High population and anthropogenic activities in the area may lead the contamination of microplastics in its marine organisms. Microplastics were recovered from the soft tissues of three species of wild clams, Gafrarium tumidum, Anadara antiquata, and Venerupis philippinarum. In each species, microplastics were grouped based on their types and sizes. The extraction of microplastics was using 30% H2O2, while flotation method using NaCl was used to separate the dissolved liquid of the clam’s soft tissues. Microplastic ingestion was found in 99.23% of the clam samples with average concentration of 3.5 ± 2.8 items/individual and 3.2 ± 2.52 items/g. V. philippinarum had the highest microplastics concentration (4.9 ± 2.80 items/g and 5.6 ± 3.22 items/individual). Microplastic types from all samples were dominated by fibers (80.77%), in which 57% of them were less than 200 µm in size. The ubiquitous contamination of microplastics in clams of the coastal waters of Lamongan, Indonesia is serious concerns for marine food webs and human health.","PeriodicalId":15689,"journal":{"name":"Journal of Engineering and Technological Sciences","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48073690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Influence of Superplasticizer Dosage on Workability and Mechanical properties of Concrete made with Recycled Aggregate 高效减水剂用量对再生骨料混凝土和易性及力学性能的影响

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Journal of Engineering and Technological Sciences Pub Date : 2022-09-05 DOI: 10.5614/j.eng.technol.sci.2022.54.5.2

A. Al-Luhybi, N. H. Al-Jubory, Anas Ahmed

引用次数: 0

Evaluation of Asaoka and Hyperbolic Methods for Settlement Prediction of Vacuum Preloading Combined with Prefabricated Vertical Drains in Soft Ground Treatment 软土地基真空预压与预制垂直排水管联合沉降预测的Asaoka和双曲线法评价

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Journal of Engineering and Technological Sciences Pub Date : 2022-09-05 DOI: 10.5614/j.eng.technol.sci.2022.54.5.1

Quang Dong Pham, Van-Linh Ngo, The Viet Tran, M. Trinh

{"title":"Evaluation of Asaoka and Hyperbolic Methods for Settlement Prediction of Vacuum Preloading Combined with Prefabricated Vertical Drains in Soft Ground Treatment","authors":"Quang Dong Pham, Van-Linh Ngo, The Viet Tran, M. Trinh","doi":"10.5614/j.eng.technol.sci.2022.54.5.1","DOIUrl":"https://doi.org/10.5614/j.eng.technol.sci.2022.54.5.1","url":null,"abstract":"This study evaluated the use of the Asaoka and hyperbolic methods to estimate the ultimate settlement of soft ground treated by vacuum preloading combined with prefabricated vertical drains. For this aim, a large-scale physical laboratory model was constructed. The model was a reinforced-tempered glass box containing a soil mass with dimensions of 2.0 × 1.0 × 1.2 m (length × width × depth). Physical models of this scale for the same purpose are rare in the literature. The soil was taken from a typical coastal region in Dinh Vu Hai Phong, Vietnam. The surface settlement near and between the two drains was measured right after the vacuum preloading started. Important properties of the soil were tested to evaluate the effectiveness of the treatment method. The measured settlement was used in the Asaoka and hyperbolic methods to predict the potential ultimate settlement. The results showed the superiority of the vacuum consolidation approach in improving fundamental engineering properties of soft soil. Furthermore, the ultimate settlement predicted by both methods showed a good agreement with the measured value, proving that the Asaoka and hyperbolic methods are suitable for the estimation of the ultimate settlement of soft soil treated with vacuum consolidation.","PeriodicalId":15689,"journal":{"name":"Journal of Engineering and Technological Sciences","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48119375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of the Copper Industry Chain in Indonesia Using a System Dynamics Approach to Optimize Its Added Value 基于系统动力学方法的印尼铜产业链附加值优化分析

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Journal of Engineering and Technological Sciences Pub Date : 2022-09-05 DOI: 10.5614/j.eng.technol.sci.2022.54.5.4

Atika Rahmahwati, Aryo Wibowo, F. Rosyid

{"title":"Analysis of the Copper Industry Chain in Indonesia Using a System Dynamics Approach to Optimize Its Added Value","authors":"Atika Rahmahwati, Aryo Wibowo, F. Rosyid","doi":"10.5614/j.eng.technol.sci.2022.54.5.4","DOIUrl":"https://doi.org/10.5614/j.eng.technol.sci.2022.54.5.4","url":null,"abstract":"Indonesia is a leading producer of a wide range of minerals, including copper. Nonetheless, the copper-based industry in Indonesia is still not well developed, especially the limited number of products from the intermediate copper industry which will become raw materials for its downstream industry. The underdeveloped intermediate copper industry has forced Indonesia to import several types of copper-based semi-finished products to meet the needs of the downstream industry. On the other hand, the mining industry still exports copper concentrate and some copper cathodes produced by smelting. As a result, the added value obtained by Indonesia from copper is not optimal. Therefore, it is necessary to conduct research on the copper industry chain and to estimate the increase in added value that could be generated. In this study, a system dynamics (SD) model was developed. During the simulation period of 2020 to 2030, the total added value along the copper industry chain that can be obtained is USD 70,422,840,000 if the planned smelter and refinery is completed in 2023 to process all domestic concentrates and to increase intermediate industry capacity.","PeriodicalId":15689,"journal":{"name":"Journal of Engineering and Technological Sciences","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43650431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of Electrode Material Composition from Activated Carbon, MWCNT & Graphene to Enhance Performance of Supercapacitor 优化活性炭、MWCNT和石墨烯电极材料组成以提高超级电容器性能

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Journal of Engineering and Technological Sciences Pub Date : 2022-09-05 DOI: 10.5614/j.eng.technol.sci.2022.54.5.5

H. Rustamaji, T. Prakoso, H. Devianto, P. Widiatmoko

引用次数: 0

Markerless Optical Motion Capture System for Asymmetrical Swimming Stroke 非对称泳姿的无标记光学运动捕捉系统

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Journal of Engineering and Technological Sciences Pub Date : 2022-09-05 DOI: 10.5614/j.eng.technol.sci.2022.54.5.3

F. Ferryanto, A. Mahyuddin, M. Nakashima

{"title":"Markerless Optical Motion Capture System for Asymmetrical Swimming Stroke","authors":"F. Ferryanto, A. Mahyuddin, M. Nakashima","doi":"10.5614/j.eng.technol.sci.2022.54.5.3","DOIUrl":"https://doi.org/10.5614/j.eng.technol.sci.2022.54.5.3","url":null,"abstract":"This work presents the development of a markerless optical motion capture system of the front-crawl swimming stroke. The system only uses one underwater camera to record swimming motion in the sagittal plane. The participant in this experiment was a swimmer who is active in the university’s swimming club. The recorded images were then segmented to obtain silhouettes of the participant by a Gaussian Mixture Model. One of the swimming images was employed to generate a human body model that consists of 15 segments. The silhouette and model of the participant were subjected to an image matching process. The shape of the body segment was used as the feature in the image matching. The model was transformed to estimate the pose of the participant. The intraclass correlation coefficient between the results of the developed system and references were evaluated. In general, all body segments, except head and trunk, had a correlation coefficient higher than 0.95. Then, dynamics analysis by SWUM was conducted based on the joint angle acquired by the present work. The simulation implied that the developed system was suitable for daily training of athletes and coaches due to its simplicity and accuracy.","PeriodicalId":15689,"journal":{"name":"Journal of Engineering and Technological Sciences","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41648723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Coliform Removal in Membrane Bioreactor and Disinfection during Hospital Wastewater Treatment 膜生物反应器中大肠菌群的去除及医院污水处理中的消毒

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Journal of Engineering and Technological Sciences Pub Date : 2022-07-18 DOI: 10.5614/j.eng.technol.sci.2022.54.4.1

C. Chiemchaisri, W. Chiemchaisri, Sujipat Dachsrijan, Chitsuphang Saengam

{"title":"Coliform Removal in Membrane Bioreactor and Disinfection during Hospital Wastewater Treatment","authors":"C. Chiemchaisri, W. Chiemchaisri, Sujipat Dachsrijan, Chitsuphang Saengam","doi":"10.5614/j.eng.technol.sci.2022.54.4.1","DOIUrl":"https://doi.org/10.5614/j.eng.technol.sci.2022.54.4.1","url":null,"abstract":"This study investigated coliform removal from hospital wastewater in a membrane bioreactor (MBR) and disinfection using either chlorine or ozone. A laboratory-scale MBR equipped with a hollow-fiber membrane module was operated with hydraulic retention times varied at 3 and 6 hours. The disinfection of MBR effluent was carried out using either chlorine or ozone with concentrations varied between 1 and 10 mg/l and contact time varied between 1 and 30 min. During 150 days of MBR operation, organic removal efficiencies averaged 96.5% and 97.7% for BOD and 73.6% and 84.1% during its operation at an HRT of 3 and 6 hours respectively. Simultaneously, 6.7 and 6.4 log reduction of total coliforms and 6.2 and 6.1 log reduction of E. coli were achieved under these respective HRT conditions. The use of chlorine for disinfection of MBR effluent could eliminate total coliforms and E. coli completely at >6 and 3 mg/L at 30 min contact time, whereas only >3 and 1 mg/L was required for ozone at the same contact time. There was a significant improvement of disinfection efficacy of solid-free MBR effluent compared to that of activated sludge effluent.","PeriodicalId":15689,"journal":{"name":"Journal of Engineering and Technological Sciences","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48933739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3