{"title":"Non-Linear Steady State Heat Conduction using Element-Free Galerkin Method","authors":"Nawraj Bhattarai, Puspa Baral, A. Jha","doi":"10.19026/RJASET.18.6061","DOIUrl":"https://doi.org/10.19026/RJASET.18.6061","url":null,"abstract":"","PeriodicalId":21010,"journal":{"name":"Research Journal of Applied Sciences, Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82120132","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}
M. Abduh, Nurhayati Buru Tarigan, A. Hidayat, R. Manurung
{"title":"Valorization of Rice Straw and Tofu Residue using Hermetia illucens to Produce Protein Rich Biomass and Organic Fertilizer","authors":"M. Abduh, Nurhayati Buru Tarigan, A. Hidayat, R. Manurung","doi":"10.19026/RJASET.18.6060","DOIUrl":"https://doi.org/10.19026/RJASET.18.6060","url":null,"abstract":"","PeriodicalId":21010,"journal":{"name":"Research Journal of Applied Sciences, Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80929391","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}
{"title":"Synthesis of Protein Hydrolysate from the Prepupae of Hermetia illucens using a Papain Enzymes","authors":"Rini Triani, Rika Alfianny, R. Manurung, M. Abduh","doi":"10.19026/RJASET.18.6059","DOIUrl":"https://doi.org/10.19026/RJASET.18.6059","url":null,"abstract":"","PeriodicalId":21010,"journal":{"name":"Research Journal of Applied Sciences, Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77757109","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}
The aim of this study is to improve the proprieties of the mixtures of rice straw and clay. Thus, we conduct this study related to the mixtures of rice straw, clay and cement for their use as building material. The clay formations represent abundant economical materials resources available in tropical and equatorial Africa. Rice straw is rich in cellulose. Consequently, few animals are able to use it as food. We have determined by experiments the mechanical and thermal properties of samples. The Interesting results obtained show that the integration of mixtures of rice straw, clay and cement in building materials are great opportunities to reduce the cost of social housing. It also improves the thermal comfort.
{"title":"Mixtures of Rice Straw, Clay and Cement for their Use as Building Material","authors":"D. Sow, A. Diokhané","doi":"10.19026/rjaset.17.5894","DOIUrl":"https://doi.org/10.19026/rjaset.17.5894","url":null,"abstract":"The aim of this study is to improve the proprieties of the mixtures of rice straw and clay. Thus, we conduct this study related to the mixtures of rice straw, clay and cement for their use as building material. The clay formations represent abundant economical materials resources available in tropical and equatorial Africa. Rice straw is rich in cellulose. Consequently, few animals are able to use it as food. We have determined by experiments the mechanical and thermal properties of samples. The Interesting results obtained show that the integration of mixtures of rice straw, clay and cement in building materials are great opportunities to reduce the cost of social housing. It also improves the thermal comfort.","PeriodicalId":21010,"journal":{"name":"Research Journal of Applied Sciences, Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76681308","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}
A. Abakar, Abdallah Dadi Mahamat, A. Donnot, J. Tanguier, R. Benelmir
This study aims to determine the physical characteristics of rice straw and highlights the presence of sugar in rice straw. The use of natural fibers as a reinforcement in construction has existed for millennia. They are mixed with clay to make building materials. This addition avoids cracks and sometimes contributes to flexural strength. Researchers have detected a high level of sugar in natural fibers. This sugar contained in the biomass is at the origin of the setting delay and the hardening of the building materials. Another not least significant defect found in natural fiber is its high water absorption potential. This hydrophilic character is due to the intrinsic porosity of the straws. This article aims to determine the physical characteristics of rice straw and highlights the presence of sugar in rice straw. First, the density and water absorption rate of the rice straw were determined. Then chemical tests were carried out to determine the rate of mineral constituents (ash), lignin, hemicellulose and finally the rate of cellulose is deduced. Like most crop straws, rice straw contains a high level of sugar. It also has a very low density compared to other building materials. It is around 450 kg/m3. Rice straw also has a high water absorption rate. The absorption rate absorption rate (At) 5 min of immersion in water, its absorption rate reaches 234%.
{"title":"Physical and Chemical Characteristics of Rice Straw","authors":"A. Abakar, Abdallah Dadi Mahamat, A. Donnot, J. Tanguier, R. Benelmir","doi":"10.19026/rjaset.17.5478","DOIUrl":"https://doi.org/10.19026/rjaset.17.5478","url":null,"abstract":"This study aims to determine the physical characteristics of rice straw and highlights the presence of sugar in rice straw. The use of natural fibers as a reinforcement in construction has existed for millennia. They are mixed with clay to make building materials. This addition avoids cracks and sometimes contributes to flexural strength. Researchers have detected a high level of sugar in natural fibers. This sugar contained in the biomass is at the origin of the setting delay and the hardening of the building materials. Another not least significant defect found in natural fiber is its high water absorption potential. This hydrophilic character is due to the intrinsic porosity of the straws. This article aims to determine the physical characteristics of rice straw and highlights the presence of sugar in rice straw. First, the density and water absorption rate of the rice straw were determined. Then chemical tests were carried out to determine the rate of mineral constituents (ash), lignin, hemicellulose and finally the rate of cellulose is deduced. Like most crop straws, rice straw contains a high level of sugar. It also has a very low density compared to other building materials. It is around 450 kg/m3. Rice straw also has a high water absorption rate. The absorption rate absorption rate (At) 5 min of immersion in water, its absorption rate reaches 234%.","PeriodicalId":21010,"journal":{"name":"Research Journal of Applied Sciences, Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73125366","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}
In the quest for better photovoltaic performance, we simulated the CdTe-based thin film solar cell in ITO/CdS/CdTe/Mo structure with SCAPS (Solar Cell Capacitance Simulator). SCAPS model makes possible to study the effect of the thickness of layers and the gap energy (Eg) of each layer (CdTe, CdS and ITO) on the electrical characteristics of outputs such as open-circuit voltage (Voc), short-circuit current density (Jsc), Form Factor (FF) and efficiency (&eta) of the cell. The results of the simulations were in good agreement with those of the literature and revealed that increasing the thickness of the ITO window layer and of the CdS buffer cell layer reduces the photovoltaic efficiency. Conversely, the conversion rate increases with the thickness of the CdTe absorbent layer. The optimized values of layer thicknesses and energy gap of the absorber layer of the CdTe solar cell provide good photovoltaic performance with an optimal efficiency of 22%.
{"title":"Optimization of the Electrical Characteristics of Cadmium Telluride Based Thin Layer Solar Cell According to Thickness and Gap Energy","authors":"E. Ndiaye, S. Seck, M. Fall, S. Charvet","doi":"10.19026/rjaset.17.5821","DOIUrl":"https://doi.org/10.19026/rjaset.17.5821","url":null,"abstract":"In the quest for better photovoltaic performance, we simulated the CdTe-based thin film solar cell in ITO/CdS/CdTe/Mo structure with SCAPS (Solar Cell Capacitance Simulator). SCAPS model makes possible to study the effect of the thickness of layers and the gap energy (Eg) of each layer (CdTe, CdS and ITO) on the electrical characteristics of outputs such as open-circuit voltage (Voc), short-circuit current density (Jsc), Form Factor (FF) and efficiency (&eta) of the cell. The results of the simulations were in good agreement with those of the literature and revealed that increasing the thickness of the ITO window layer and of the CdS buffer cell layer reduces the photovoltaic efficiency. Conversely, the conversion rate increases with the thickness of the CdTe absorbent layer. The optimized values of layer thicknesses and energy gap of the absorber layer of the CdTe solar cell provide good photovoltaic performance with an optimal efficiency of 22%.","PeriodicalId":21010,"journal":{"name":"Research Journal of Applied Sciences, Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75310751","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}
A. Alajmi, T. Ashwin, J. G. Alotaibi, B. F. Yousif
This project conducts a study on wear performance and frictional behaviour of selected metals against stainless steel counterface under dry contact condition. The chosen materials for conducting this study are mild steel, copper and aluminium. The parameters used for inspection and analysis of this project are applied load (0-90N) and sliding distance (0-14 km). Block on ring machine was used to conduct the adhesive wear testings. The worn surfaces are examined and wear mechanisms are categorized using scanning electron microscopy. The results reveal that copper shows better wear properties and aluminium shows less friction. Mild steel exhibits a high rate of wear and material removal. All three materials revealed three different wear mechanisms; aluminium (abrasive and adhesive), mild steel (abrasive and ploughing), copper (adhesive).
{"title":"Tribological Characteristics of Commercial Metals","authors":"A. Alajmi, T. Ashwin, J. G. Alotaibi, B. F. Yousif","doi":"10.19026/rjaset.17.5651","DOIUrl":"https://doi.org/10.19026/rjaset.17.5651","url":null,"abstract":"This project conducts a study on wear performance and frictional behaviour of selected metals against stainless steel counterface under dry contact condition. The chosen materials for conducting this study are mild steel, copper and aluminium. The parameters used for inspection and analysis of this project are applied load (0-90N) and sliding distance (0-14 km). Block on ring machine was used to conduct the adhesive wear testings. The worn surfaces are examined and wear mechanisms are categorized using scanning electron microscopy. The results reveal that copper shows better wear properties and aluminium shows less friction. Mild steel exhibits a high rate of wear and material removal. All three materials revealed three different wear mechanisms; aluminium (abrasive and adhesive), mild steel (abrasive and ploughing), copper (adhesive).","PeriodicalId":21010,"journal":{"name":"Research Journal of Applied Sciences, Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82522173","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}
This paper presents a theoretical study of the external magnetic field and the air mass effects on the carrier density, the transient open circuit voltage decay and the effective minority carrier’s lifetime in a polycrystalline silicon solar cell. From a theoretical approach based on the columnar model of the grains and the quasi-neutral base, the three-dimensional diffusion equation is established and the boundaries conditions are defined in order to use Green’s functions to solve this equation. New analytical expressions of carrier’s density and transient voltage are also found. The magnetic field and the air mass impacts on transient electrons density and transient open circuit voltage are then analyzed. The effective minority carrier lifetime is extracted from the curve versus time of transient open circuit voltage decay for different values of magnetic field and air mass.
{"title":"External Magnetic Field and Air Mass Effects on Carrier’s Effective Lifetime of a Bifacial Solar Cell under Transient State","authors":"Alain Diasso, R. Sam, F. Zougmore","doi":"10.19026/rjaset.17.6026","DOIUrl":"https://doi.org/10.19026/rjaset.17.6026","url":null,"abstract":"This paper presents a theoretical study of the external magnetic field and the air mass effects on the carrier density, the transient open circuit voltage decay and the effective minority carrier’s lifetime in a polycrystalline silicon solar cell. From a theoretical approach based on the columnar model of the grains and the quasi-neutral base, the three-dimensional diffusion equation is established and the boundaries conditions are defined in order to use Green’s functions to solve this equation. New analytical expressions of carrier’s density and transient voltage are also found. The magnetic field and the air mass impacts on transient electrons density and transient open circuit voltage are then analyzed. The effective minority carrier lifetime is extracted from the curve versus time of transient open circuit voltage decay for different values of magnetic field and air mass.","PeriodicalId":21010,"journal":{"name":"Research Journal of Applied Sciences, Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81661933","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}
Permanent magnet synchronous motor as an actuator for ropeless elevator has several challenges that have to reduce to make the system stable and secure. Detent force as one of a problem for having stabilization system is going to investigate on how its performance under fuzzy logic controller with a nonlinear test such as variations on load and distance to get a policy that can be used for industrial field or other human activities. Preliminary research is presented in this study by making a simulation of control with a fuzzy logic application by Mamdani design and this also aims to compare the previous PI simulation paper. In this fuzzy controller, simulation made with parameters which can cause the existence of detent force such as load, speed, distance, current and power to analyze how the performance under variation situation. With this simulation yield that fuzzy can relatively minimize detent force without considering the impact of saturation or hysteresis on the controller. The simulation is done on 2018 in electrical department of Universitas Indonesia by using the MATLAB R2010a toolbox.
{"title":"Simulation of Control Elevator Use Fuzzy Logic Method","authors":"Ainil Syafitri, M. K. I. Garniwa","doi":"10.19026/rjaset.17.5456","DOIUrl":"https://doi.org/10.19026/rjaset.17.5456","url":null,"abstract":"Permanent magnet synchronous motor as an actuator for ropeless elevator has several challenges that have to reduce to make the system stable and secure. Detent force as one of a problem for having stabilization system is going to investigate on how its performance under fuzzy logic controller with a nonlinear test such as variations on load and distance to get a policy that can be used for industrial field or other human activities. Preliminary research is presented in this study by making a simulation of control with a fuzzy logic application by Mamdani design and this also aims to compare the previous PI simulation paper. In this fuzzy controller, simulation made with parameters which can cause the existence of detent force such as load, speed, distance, current and power to analyze how the performance under variation situation. With this simulation yield that fuzzy can relatively minimize detent force without considering the impact of saturation or hysteresis on the controller. The simulation is done on 2018 in electrical department of Universitas Indonesia by using the MATLAB R2010a toolbox.","PeriodicalId":21010,"journal":{"name":"Research Journal of Applied Sciences, Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83720046","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}
N. Farouk, Mohand Omer, S. G. Babiker, M. Sid-Ahmed
Port Sudan city is a capital of the Red Sea State in the republic of Sudan in south-eastern Africa. The city has high consumption of power for street lighting. The lighting is needed for 12 h/day. This consumes about 11.5 Mw day. The aim of this paper is study the proposed system to reduce the streetlight power consumption use in Port Sudan City and to explore the renewable energy to work alternative energy sources. The present paper studies the proposed system called (all-in-one) street lighting system consisting of PV panel, lithium ion battery and light sensor with LED lamp, all connected and constructed in single unit. The proposed system is to be used in Port Sudan city to decrease the electricity consumption, especially in summer. The problem has been treated theoretically. The proposed system has been compared with two types of plant the first plant used 250W lamp Ac and the second plant used 100W LED lamp. The results show that the proposed system has low cost, about 80 USD and much better economically. The proposed system can solve the power loss in Port Sudan city, saving 11.5 Mw day for this city and more than 428,000 SUP/day. The results show that the proposed system could be utilized to reduce lighting consumption, save energy and developments on environment. We therefore recommended to uses the proposed system in many countries not only in Port Sudan City.
{"title":"Using Photo Voltage Solar and Light Emitting Diodes to Reduce Energy Consumption: Case Study in Port Sudan City","authors":"N. Farouk, Mohand Omer, S. G. Babiker, M. Sid-Ahmed","doi":"10.19026/rjaset.17.6043","DOIUrl":"https://doi.org/10.19026/rjaset.17.6043","url":null,"abstract":"Port Sudan city is a capital of the Red Sea State in the republic of Sudan in south-eastern Africa. The city has high consumption of power for street lighting. The lighting is needed for 12 h/day. This consumes about 11.5 Mw day. The aim of this paper is study the proposed system to reduce the streetlight power consumption use in Port Sudan City and to explore the renewable energy to work alternative energy sources. The present paper studies the proposed system called (all-in-one) street lighting system consisting of PV panel, lithium ion battery and light sensor with LED lamp, all connected and constructed in single unit. The proposed system is to be used in Port Sudan city to decrease the electricity consumption, especially in summer. The problem has been treated theoretically. The proposed system has been compared with two types of plant the first plant used 250W lamp Ac and the second plant used 100W LED lamp. The results show that the proposed system has low cost, about 80 USD and much better economically. The proposed system can solve the power loss in Port Sudan city, saving 11.5 Mw day for this city and more than 428,000 SUP/day. The results show that the proposed system could be utilized to reduce lighting consumption, save energy and developments on environment. We therefore recommended to uses the proposed system in many countries not only in Port Sudan City.","PeriodicalId":21010,"journal":{"name":"Research Journal of Applied Sciences, Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77619358","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}
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