Jurnal Teknologi-Sciences & Engineering最新文献_第2页

COMPARATIVE STUDY OF CONFIGURATIONS FOR PHOTOVOLTAIC-THERMOELECTRIC GENERATOR COGENERATION SYSTEM 光伏-热电联产系统配置的比较研究

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Jurnal Teknologi-Sciences & Engineering Pub Date : 2023-08-21 DOI: 10.11113/jurnalteknologi.v85.20222

R. Ayop, Chee Wei Tan, Shahrin Md. Ayob, Lau Kwan Yiew, Ho Wai Shin

{"title":"COMPARATIVE STUDY OF CONFIGURATIONS FOR PHOTOVOLTAIC-THERMOELECTRIC GENERATOR COGENERATION SYSTEM","authors":"R. Ayop, Chee Wei Tan, Shahrin Md. Ayob, Lau Kwan Yiew, Ho Wai Shin","doi":"10.11113/jurnalteknologi.v85.20222","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.20222","url":null,"abstract":"Photovoltaic (PV) converts solar energy to electrical energy directly. During this process, the PV produce energy losses in the form of heat energy. To improve the system's efficiency, this heat energy is converted into electrical energy using the thermoelectric generator (TEG). The PV and TEG have a nonlinear current-voltage characteristic and it requires a power converter with maximum power point tracking (MPPT) to properly extract the energy. There are several configurations of power converters available for the PV-TEG cogeneration system (PTCS). Nonetheless, the literature that compares the performance of the configurations is unavailable. This paper compares 4 configurations for the PTCS, which include the separate boost full MPPT (SBFM), separate boost partial MPPT, series source boost MPPT, and PV boost MPPT with series TEG. The boost converter with perturb and observe MPPT method is used for all configurations to ensure a fair comparison. The results show that SBFM can efficiently extract the energy from both PV and TEG up to 98.5%. The other configurations can efficiently extract energy from the PV (more than 98.5%). However, the energy extracts from the TEG have a low efficiency down to 87%. Overall, the configuration chosen for the PTCS affects the efficiency of the system.","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42700214","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

DETERIORATION KINETICS OF NEUTRALIZED RED FRUIT (Pandanus conoideus L.) OIL DURING STORAGE 中和后红果变质动力学研究储存期间的油

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Jurnal Teknologi-Sciences & Engineering Pub Date : 2023-08-21 DOI: 10.11113/jurnalteknologi.v85.19526

Z. L. Sarungallo, Budi Santoso, Yuyun Yuanita Digna Letsoin, I. Epriliati

{"title":"DETERIORATION KINETICS OF NEUTRALIZED RED FRUIT (Pandanus conoideus L.) OIL DURING STORAGE","authors":"Z. L. Sarungallo, Budi Santoso, Yuyun Yuanita Digna Letsoin, I. Epriliati","doi":"10.11113/jurnalteknologi.v85.19526","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.19526","url":null,"abstract":"\u0000\u0000\u0000\u0000This study’s goal was to obtain a kinetics model of neutralized red fruit oil (NRFO) quality change during storage. The NRFO was stored in dark bottles at 60 °C, 75 °C and 90 °C for ± 15 days to evaluate the quality. The results showed that the quality of NRFO decreased along with the increase in temperature and storage time. This was indicated by increasing moisture content, Free Fatty Acid (FFA), peroxide number, as well as decreasing of the total carotenoids and total tocopherols. The FFA content and peroxide number of NRFO increase followed the kinetics zeroth order model, with activation energy (Ea) of 6372 cal/moloK and 9954 cal/moloK, respectively. Meanwhile, the decrease in carotenoid and tocopherol content followed the kinetics first order model, with Ea 9581 cal/moloK and 14242 cal/moloK, respectively. Estimation of shelf life of NRFO was based on peroxide number equation. The shelf life of NRFO is 398.5 days or 13.3 months if it is stored at 20 °; and the shelf life is 277.6 days or 9.3 months if it is stored 30 °C. \u0000\u0000\u0000\u0000\u0000 ","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42884804","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

SUB-ACUTE TOXICITY STUDY OF DIABECINE RECONSTITUTE IN SPRAGUE-DAWLEY RATS: A PRELIMINARY STUDY IN THE EVALUATION AS AN ANTIHYPERGLYCEMIA AGENT 糖尿病复配物对sd - dawley大鼠的亚急性毒性研究:作为抗高血糖药物评价的初步研究

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Jurnal Teknologi-Sciences & Engineering Pub Date : 2023-08-21 DOI: 10.11113/jurnalteknologi.v85.19023

Nur Syukriah Ab Rahman, Fadzilah Adibah Abd Majid, Effendy Abd Wahid, Ain Nabihah Zainuddin, H. F. Ismail

{"title":"SUB-ACUTE TOXICITY STUDY OF DIABECINE RECONSTITUTE IN SPRAGUE-DAWLEY RATS: A PRELIMINARY STUDY IN THE EVALUATION AS AN ANTIHYPERGLYCEMIA AGENT","authors":"Nur Syukriah Ab Rahman, Fadzilah Adibah Abd Majid, Effendy Abd Wahid, Ain Nabihah Zainuddin, H. F. Ismail","doi":"10.11113/jurnalteknologi.v85.19023","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.19023","url":null,"abstract":"Diabecine reconstitute is a combination of well-known herbs such as Cinnamomum zeylanicum, Eugenia polyantha, Curcuma xanthorizza, Orthosiphon stamineus and Andrographis paniculata which are believed to give promising finding especially in the treatment of diabetes mellitus. However, no scientific studies have been performed to investigate its toxicological effect. Therefore, this study aimed to evaluate its safety profile using sub-acute toxicity (14 days repeated doses) in rat model. The sub-acute toxicity study was evaluated by daily administration of different doses (250, 600 and 2000 mg/kg) of diabecine reconstitute for 14 days. Clinical signs, body weight changes, food and water intake, white blood count and relative organ weight were recorded. While the liver and kidney were removed for histological analysis. The result indicated that administration of diabecine reconstitute did not show significant differences in food consumption, water intake and white blood count (p>0.05) as compared to the control. However, there is significant difference observed in body weight and relative organ weight (p<0.05). Diabecine reconstitute at 600 and 2000 mg/kg proved to be toxic to kidney and liver in histopathology studies. However, the diabecine reconstitute at concentration of 250 mg/kg is safe to be used and showed no toxicity effect. Therefore, diabecine reconstitute at dose of 250 mg/kg was found to be toxicologically safe and it may be a good potential polyherbal formula to be incorporated in the diabetes mellitus treatment.","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42800246","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 ACTIVE SECONDARY SUSPENSION WITH MODIFIED SKYHOOK CONTROLLER TO IMPROVE RIDE PERFORMANCE OF RAILWAY VEHICLE 改进天钩控制器的主动二次悬架改进轨道车辆平顺性分析

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Jurnal Teknologi-Sciences & Engineering Pub Date : 2023-08-21 DOI: 10.11113/jurnalteknologi.v85.19771

Fathiah Mohamed Jamil, M. Abdullah, M. H. Harun, Munaliza Ibrahim, F. Ahmad, U. Ubaidillah

引用次数: 0

A REVIEW OF MICROWAVE CURING TECHNIQUE TO FABRICATE NATURAL FIBER REINFORCED POLYMER COMPOSITES 微波固化制备天然纤维增强聚合物复合材料的研究进展

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Jurnal Teknologi-Sciences & Engineering Pub Date : 2023-08-21 DOI: 10.11113/jurnalteknologi.v85.20087

Tasha Lai Sie Ming, E. Jayamani, Soon Kok Heng

引用次数: 0

A RECENT REVIEW OF THE SANDWICH-STRUCTURED COMPOSITE METAMATERIALS: STATIC AND DYNAMIC ANALYSIS 三明治结构复合材料的最新进展:静态和动态分析

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Jurnal Teknologi-Sciences & Engineering Pub Date : 2023-08-21 DOI: 10.11113/jurnalteknologi.v85.20282

Emad Kadum Njim, Sadiq Emad, Mohsin Noori Hamzah

{"title":"A RECENT REVIEW OF THE SANDWICH-STRUCTURED COMPOSITE METAMATERIALS: STATIC AND DYNAMIC ANALYSIS","authors":"Emad Kadum Njim, Sadiq Emad, Mohsin Noori Hamzah","doi":"10.11113/jurnalteknologi.v85.20282","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.20282","url":null,"abstract":"Metamaterials, commonly known as synthetic composites with exotic dynamic characteristics, have recently generated increasing interest. A short description of composite metamaterial and their types, applications, and manufacturing techniques was reported. Contrary to all previous research, this investigation focuses on the recent studies of static and dynamic analysis of composite metamaterial structure and mechanical performance using experimental and finite element method analyses. Furthermore, the literature has described several methods for constructing composite sandwiches, properties, and advantages over conventional materials. Due to the wide variety of materials and configurations used in the final product, there is a corresponding diversity in manufacturing techniques. Therefore, the current research has mainly concentrated on a wealth of information that should be important to all researchers interested in keeping up with the most recent developments in composite metamaterial sandwich structures. Consequently, this study can be considered a guideline for researchers who intend further research on the mechanical behavior analysis and technology of designed composite metamaterial structures.\u0000 ","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41795621","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

NUMERICAL INVESTIGATIONS ON COMBINED EFFECT OF WELDING RESIDUAL STRESS AND AXIAL COMPRESSIVE LOAD ON BUCKLING CAPACITY OF THIN LOW CARBON STEEL PLATES 焊接残余应力和轴向压缩载荷联合作用对低碳薄板屈曲性能影响的数值研究

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Jurnal Teknologi-Sciences & Engineering Pub Date : 2023-08-21 DOI: 10.11113/jurnalteknologi.v85.19411

Sivasubramaniyan N. S., Sumanlal M. S., Joy Varghese V. M.

{"title":"NUMERICAL INVESTIGATIONS ON COMBINED EFFECT OF WELDING RESIDUAL STRESS AND AXIAL COMPRESSIVE LOAD ON BUCKLING CAPACITY OF THIN LOW CARBON STEEL PLATES","authors":"Sivasubramaniyan N. S., Sumanlal M. S., Joy Varghese V. M.","doi":"10.11113/jurnalteknologi.v85.19411","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.19411","url":null,"abstract":"\u0000\u0000\u0000\u0000Arc welding is the most commonly used metal joining process and its broad range of applications from large structural fabrications such as bridges to delicate satellite and aerospace components. Welding Residual Stress (WRS) and cracks developed during welding, reduce the quality of welds. Aerospace structures are normally fabricated using thin metal sheets to reduce mass and are always susceptible to buckling. Many researchers have published WRS numerical models and experimental validations, but the impact of WRS on the buckling of thin low carbon steel plates is yet to be studied. The main objective of this study is to analyse the influence of external compressive load and tendon force generated by welding residual stress on buckling strength of the TIG welded low-carbon steel plates. Linear buckling of welded plates under the combined effect of external compressive load and WRS generated due to various weld lengths were numerically modelled and its critical buckling loads are computed. The numerical simulation findings show that the critical buckling strength decreases by 80% when the weld length to plate width ratio (w/wl) is equal to unity and it reduces to minimum when the w/wl ratio is 0.5. After w/wl ratio is 0.5, buckling strength increases and this behavior is caused by the stress field interaction that arises from both the applied axial compressive load and the WRS on the plate.\u0000\u0000\u0000\u0000","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49331001","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

NUMERICAL AND THEORETICAL INVESTIGATION ON COMPOSITE COLD-FORMED STEEL JOINTS WITH LIGHTWEIGHT CONCRETE 轻型混凝土与冷弯型钢组合节点的数值与理论研究

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Jurnal Teknologi-Sciences & Engineering Pub Date : 2023-08-21 DOI: 10.11113/jurnalteknologi.v85.20113

C. Tan, Xiuwen Choo, Jian Jun Moy, A. Sulaiman

{"title":"NUMERICAL AND THEORETICAL INVESTIGATION ON COMPOSITE COLD-FORMED STEEL JOINTS WITH LIGHTWEIGHT CONCRETE","authors":"C. Tan, Xiuwen Choo, Jian Jun Moy, A. Sulaiman","doi":"10.11113/jurnalteknologi.v85.20113","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.20113","url":null,"abstract":"This research intends to investigate behaviour of composite cold-formed steel joint numerically through finite element analysis by using ABAQUS and theoretically by referring to BS 5950-1:2000 and Green book P213 “Joint in Steel Construction-Composite Connection”. A composite joint is modelled by combination of composite beam and steel column with connection of HRS gusset plate and M12 bolts. The significant failure mode is local buckling in CFS column web which similar in experimental study, FEM numerical simulation and theoretical component calculation. The behaviour of the cold-formed steel composite joint will be expressed in moment-rotational and load-deflection relationship to determine the initial rotational stiffness and ultimate moment resistance. The findings from numerical and theoretical investigations are compared with the full-scale experimental study in three different thicknesses of gusset plate. A correlation in stiffness ratio and strength ratio are obtained in the range of 1.76 to 2.25, and 1.00 to 1.60 respectively indicating that the numerical modelling tends to underpredict the behaviour of the composite structures.","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44325280","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

A REVIEW ON 4D ADDITIVE MANUFACTURING - THE APPLICATIONS, SMART MATERIALS & EFFECT OF VARIOUS STIMULI ON 4D PRINTED OBJECTS 4D增材制造综述&应用、智能材料&各种刺激对4D印刷品的影响

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Jurnal Teknologi-Sciences & Engineering Pub Date : 2023-08-21 DOI: 10.11113/jurnalteknologi.v85.19889

S. Maidin, Kuek Jin Wee, Mohamad Afiq Sharum, Thavinnesh Kumar Rajendran, Latifah Mohd Ali, Shafinaz Ismail

{"title":"A REVIEW ON 4D ADDITIVE MANUFACTURING - THE APPLICATIONS, SMART MATERIALS & EFFECT OF VARIOUS STIMULI ON 4D PRINTED OBJECTS","authors":"S. Maidin, Kuek Jin Wee, Mohamad Afiq Sharum, Thavinnesh Kumar Rajendran, Latifah Mohd Ali, Shafinaz Ismail","doi":"10.11113/jurnalteknologi.v85.19889","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.19889","url":null,"abstract":"\u0000\u0000\u0000\u0000Additive Manufacturing, often known as 3D printing, is a process that uses a variety of materials to manufacture highly accurate items layer by layer. However, this technology has its limitations. One such limitation is the inability to print components larger than the printer's size due to the limited size of the build chamber. 4D additive manufacturing or 4D printing is an innovative development based on 3D printing that allows objects to be reshaped after printing, using stimuli-responsive materials that require external stimuli. This article present a review on 4D printing. Four databases, Google Scholar, ScienceDirect, IEEE Xplore, and Scopus database, were systematically searched for relevant review articles to identify and classify research studies. Specific keywords (4D printing, additive manufacturing, smart materials, stimuli, and application) were identified and used to guide the discovery of relevant studies. A total of 28 full articles were reviewed to study the applications of 4D printing, smart materials for 4D printing, as well as the effect of various stimuli on 4D printed objects. In conclusion, this review gives a summary of 4D printing and highlights its potential for revolutionizing manufacturing and further research is required to solve the limitations posed by this technology.\u0000\u0000\u0000\u0000\u0000 ","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43933319","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

NUMERICAL ANALYSIS OF MODIFIED ANGLE OF ENTRANCE AND DUCKTAIL ADDITION OF THE 1,500 GT RO-RO FERRY HULL VALIDATED WITH SHIP MODEL RESISTANCE TEST 船模阻力试验验证1500gtro-RO船壳改进的入角和添加鸭尾的数值分析

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Jurnal Teknologi-Sciences & Engineering Pub Date : 2023-08-21 DOI: 10.11113/jurnalteknologi.v85.19576

C. S. J. Mintarso, S. Semin, Erwandi Erwandi, D. Purnamasari

{"title":"NUMERICAL ANALYSIS OF MODIFIED ANGLE OF ENTRANCE AND DUCKTAIL ADDITION OF THE 1,500 GT RO-RO FERRY HULL VALIDATED WITH SHIP MODEL RESISTANCE TEST","authors":"C. S. J. Mintarso, S. Semin, Erwandi Erwandi, D. Purnamasari","doi":"10.11113/jurnalteknologi.v85.19576","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.19576","url":null,"abstract":"The main problem of ferry ships is maintaining the speed due to ship resistance. There are many efforts to reduce the resistance by modifications of them. This study aims to reduce resistance due to modification of the hull form on the bow Angle of Entrance (AoE) and ducktail addition at the transom stern. The object of the research is a 1,500 GT ro-ro ferry. The AoE minimizes wave resistance and improves flow patterns, while the ducktail reduces the negative effects of the circulation zone on the wetted transom so that waves and wake are reduced. Computational Fluid Dynamics (CFD) was used to analyze these modifications. The final results of the numerical simulation are then verified by the ship model resistance test in the towing tank. Tests were conducted in calm water conditions at a draft of 3.30 meters with a speed variation of 10 - 18 knots. The results show that with the combination of AoE and Ducktail, at ship speeds of 13 to 18 knots, the reduction in resistance from CFD ranges from 13.13% - 16.69% while the experimental results range from 16.00% - 16.54%. While separately the AoE modification is between 8.89% – 12.19% and ducktail is 3.12% -3,62%.","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46786197","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