Pub Date : 2021-12-22DOI: 10.1142/s2047684121500342
Yassine Slatni, M. Djezzar, Tarek Messai, Mahfoud Brahim
Inside a greenhouse, during the day, the temperature rises very quickly, while the plants have to face temperatures that rise to more than 35[Formula: see text]C. The plant closes its pores to limit sweating and stops growing. As soon as it gets hot, it is therefore necessary to ventilate the greenhouse. In this context, this research aims to investigate the behavior of the natural ventilation on the internal climate of the tunnel greenhouse, which contains two openings in the roof. The effect of the position of the openings on heat transfer is considered, thus promoting photosynthesis and plant growth. The vorticity transport equation, the Poisson equation and the energy equation are discretized by using the finite volume method. Two-dimensional simulations that described laminar flows in a steady state were carried out. Flows are studied for a range of parameters: the Rayleigh number, Ra, [Formula: see text], and three positions of opening ventilation. The results reveal that the ventilation through the top opening position allows the best creation of heat exchanges between the air inside the greenhouse and its atmosphere, which serves to conserve the plant under a favorable climate that allows its growth.
{"title":"Numerical simulation of thermal behavior in a naturally ventilated greenhouse","authors":"Yassine Slatni, M. Djezzar, Tarek Messai, Mahfoud Brahim","doi":"10.1142/s2047684121500342","DOIUrl":"https://doi.org/10.1142/s2047684121500342","url":null,"abstract":"Inside a greenhouse, during the day, the temperature rises very quickly, while the plants have to face temperatures that rise to more than 35[Formula: see text]C. The plant closes its pores to limit sweating and stops growing. As soon as it gets hot, it is therefore necessary to ventilate the greenhouse. In this context, this research aims to investigate the behavior of the natural ventilation on the internal climate of the tunnel greenhouse, which contains two openings in the roof. The effect of the position of the openings on heat transfer is considered, thus promoting photosynthesis and plant growth. The vorticity transport equation, the Poisson equation and the energy equation are discretized by using the finite volume method. Two-dimensional simulations that described laminar flows in a steady state were carried out. Flows are studied for a range of parameters: the Rayleigh number, Ra, [Formula: see text], and three positions of opening ventilation. The results reveal that the ventilation through the top opening position allows the best creation of heat exchanges between the air inside the greenhouse and its atmosphere, which serves to conserve the plant under a favorable climate that allows its growth.","PeriodicalId":45186,"journal":{"name":"International Journal of Computational Materials Science and Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44541620","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}
Pub Date : 2021-11-22DOI: 10.1142/s2047684121500354
Nguyen Tien Cuong
{"title":"First-Principles Study on Controlling Transport Gap of Graphene Nanoribbons using Hybrid Armchair-Zigzag Nanostructures","authors":"Nguyen Tien Cuong","doi":"10.1142/s2047684121500354","DOIUrl":"https://doi.org/10.1142/s2047684121500354","url":null,"abstract":"","PeriodicalId":45186,"journal":{"name":"International Journal of Computational Materials Science and Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42302316","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}
Pub Date : 2021-11-11DOI: 10.1142/s2047684121500263
Sanjeeva Kumar Singh, S. K. Panda
In this paper, a micromechanics method is developed to evaluate effective coefficients of piezoelectric fiber-reinforced composites. An exact solution is derived for effective elastic, piezoelectric and dielectric coefficients of such piezocomposites subjected to the applied load in the direction transverse to the fiber orientation. Simultaneously, based on finite element method, a numerical study is performed on a representative volume element of such piezo composite containing fiber in square packing arrangement. The finite element method provides a numerical solution to evaluate effective elastic, piezoelectric and dielectric coefficients for discrete volume fraction of fiber, the range being 0.1–0.6 for this study. The results are interpolated to understand the overall behavior of such piezocomposites. The results obtained from the micromechanics method and the finite element method are compared with the results obtained from other models based on strength of materials method given in the literature. It is observed that the method developed in this study provides better results for effective coefficients susceptible to fiber packing arrangements.
{"title":"An analytical approach to evaluate effective coefficients of 1–3 piezoelectric composites","authors":"Sanjeeva Kumar Singh, S. K. Panda","doi":"10.1142/s2047684121500263","DOIUrl":"https://doi.org/10.1142/s2047684121500263","url":null,"abstract":"In this paper, a micromechanics method is developed to evaluate effective coefficients of piezoelectric fiber-reinforced composites. An exact solution is derived for effective elastic, piezoelectric and dielectric coefficients of such piezocomposites subjected to the applied load in the direction transverse to the fiber orientation. Simultaneously, based on finite element method, a numerical study is performed on a representative volume element of such piezo composite containing fiber in square packing arrangement. The finite element method provides a numerical solution to evaluate effective elastic, piezoelectric and dielectric coefficients for discrete volume fraction of fiber, the range being 0.1–0.6 for this study. The results are interpolated to understand the overall behavior of such piezocomposites. The results obtained from the micromechanics method and the finite element method are compared with the results obtained from other models based on strength of materials method given in the literature. It is observed that the method developed in this study provides better results for effective coefficients susceptible to fiber packing arrangements.","PeriodicalId":45186,"journal":{"name":"International Journal of Computational Materials Science and Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41451472","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}
Pub Date : 2021-11-03DOI: 10.1142/s2047684121500251
S. Vijayalakshmi, S. Mahalakshmi, M. Muthujothi
Electronic properties of orthorhombic SSM ([Formula: see text] and monoclinic SSM ([Formula: see text] are investigated using the first-principles calculation. The half-metallic behavior that leads to the mixed ionic and electronic conductivity (MIEC) property is identified in orthorhombic SSM. In addition, the strong covalent bonding between [Formula: see text]-p and [Formula: see text]-s orbitals of orthorhombic SSM is identified from the PDOS plot. The strong covalent bonding enhances the [Formula: see text] molecular adsorption on Mn atom. On the other hand, monoclinic SSM shows the pure conducting behavior and there is no covalent bonding between Mn and O atoms. Thus, the results suggest that the half-metal Sm[Formula: see text]Sr[Formula: see text]MnO3 might be a suitable cathode material for intermediate-temperature solid oxide fuel cells.
{"title":"Electronic properties of SmxSr1−xMnO3 for solid oxide fuel cell application — a first-principles study","authors":"S. Vijayalakshmi, S. Mahalakshmi, M. Muthujothi","doi":"10.1142/s2047684121500251","DOIUrl":"https://doi.org/10.1142/s2047684121500251","url":null,"abstract":"Electronic properties of orthorhombic SSM ([Formula: see text] and monoclinic SSM ([Formula: see text] are investigated using the first-principles calculation. The half-metallic behavior that leads to the mixed ionic and electronic conductivity (MIEC) property is identified in orthorhombic SSM. In addition, the strong covalent bonding between [Formula: see text]-p and [Formula: see text]-s orbitals of orthorhombic SSM is identified from the PDOS plot. The strong covalent bonding enhances the [Formula: see text] molecular adsorption on Mn atom. On the other hand, monoclinic SSM shows the pure conducting behavior and there is no covalent bonding between Mn and O atoms. Thus, the results suggest that the half-metal Sm[Formula: see text]Sr[Formula: see text]MnO3 might be a suitable cathode material for intermediate-temperature solid oxide fuel cells.","PeriodicalId":45186,"journal":{"name":"International Journal of Computational Materials Science and Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44426577","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}
Pub Date : 2021-10-30DOI: 10.1142/s2047684121500329
Chi Ma, Yan Li
{"title":"Modeling of Phase Transition in Fabrication of Polymer-Derived Ceramics (PDCS)","authors":"Chi Ma, Yan Li","doi":"10.1142/s2047684121500329","DOIUrl":"https://doi.org/10.1142/s2047684121500329","url":null,"abstract":"","PeriodicalId":45186,"journal":{"name":"International Journal of Computational Materials Science and Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45845512","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}
Pub Date : 2021-10-18DOI: 10.1142/s2047684121500305
Van Qui Lai, Dang-Khoa. Nguyen, Rungkhun Banyong, S. Keawsawasvong
{"title":"Limit Analysis Solutions for Stability Factor of Unsupported Conical Slopes in Clays with Heterogeneity and Anisotropy","authors":"Van Qui Lai, Dang-Khoa. Nguyen, Rungkhun Banyong, S. Keawsawasvong","doi":"10.1142/s2047684121500305","DOIUrl":"https://doi.org/10.1142/s2047684121500305","url":null,"abstract":"","PeriodicalId":45186,"journal":{"name":"International Journal of Computational Materials Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41351995","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}
Pub Date : 2021-10-18DOI: 10.1142/s2047684121500275
C. Nuttibase, P. Kunthong
{"title":"A Novel Finite Element Algorithm for Predicting the Elastic Properties of Wood Fibres","authors":"C. Nuttibase, P. Kunthong","doi":"10.1142/s2047684121500275","DOIUrl":"https://doi.org/10.1142/s2047684121500275","url":null,"abstract":"","PeriodicalId":45186,"journal":{"name":"International Journal of Computational Materials Science and Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41951675","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}
Pub Date : 2021-10-18DOI: 10.1142/s2047684121500287
Khalaf Nasralla, S. Shihab, A. K. Mahmoud, Jabbar Gattmah
{"title":"Estimation of Induced Residual Stresses and Corrosion Behavior of Machined 718 Superalloy : 3D-FE Simulation and Optimization","authors":"Khalaf Nasralla, S. Shihab, A. K. Mahmoud, Jabbar Gattmah","doi":"10.1142/s2047684121500287","DOIUrl":"https://doi.org/10.1142/s2047684121500287","url":null,"abstract":"","PeriodicalId":45186,"journal":{"name":"International Journal of Computational Materials Science and Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42280997","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}
Pub Date : 2021-10-18DOI: 10.1142/s2047684121500299
Ryoichi Chiba, P. Kansuwan
{"title":"Grain Boundary Plane Rotation Analysis for FCC Bicrystal Structures Using MD Simulation","authors":"Ryoichi Chiba, P. Kansuwan","doi":"10.1142/s2047684121500299","DOIUrl":"https://doi.org/10.1142/s2047684121500299","url":null,"abstract":"","PeriodicalId":45186,"journal":{"name":"International Journal of Computational Materials Science and Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46439765","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}
Pub Date : 2021-09-29DOI: 10.1142/s2047684121500214
P. Vimala, N. Shree, U. Priyadarshini, T. Samuel
Transistor, which is the building block of all electronic devices, has continuously scaled down its dimensions for better efficiency since the advent of CMOS circuits. Due to the thermal limit on the switching and various short-channel effects (SCEs), highly scaled MOSFETs are rendered unusable for low-power applications. Hence, the Tunnel Field-Effect Transistors (TFETs) are studied extensively for ultra-low-power applications. Further, multigate TFETs have emerged as the prime candidates for achieving better gate controllability. Throughout this work, a newly revised analytical model for Heterojunction Gate All Around (HJGAA) TFET is demonstrated using a 2D parabolic approximation equation. Analytical expressions are derived for both potential distribution and field distribution using appropriate boundary conditions. This distribution of electric fields is further used to measure the rate of tunneling output, and then we have extracted the drain current numerically. The findings indicate a substantial change in the drain current characteristics while reducing the SCE impacts to a considerable amount. Feasibility of the newly updated model is verified by comparing the results of the analytical model with the results of TCAD simulator.
{"title":"Improving on current using new double-material heterojunction gate all around TFET (DMHJGAA TFET): Modeling and simulation","authors":"P. Vimala, N. Shree, U. Priyadarshini, T. Samuel","doi":"10.1142/s2047684121500214","DOIUrl":"https://doi.org/10.1142/s2047684121500214","url":null,"abstract":"Transistor, which is the building block of all electronic devices, has continuously scaled down its dimensions for better efficiency since the advent of CMOS circuits. Due to the thermal limit on the switching and various short-channel effects (SCEs), highly scaled MOSFETs are rendered unusable for low-power applications. Hence, the Tunnel Field-Effect Transistors (TFETs) are studied extensively for ultra-low-power applications. Further, multigate TFETs have emerged as the prime candidates for achieving better gate controllability. Throughout this work, a newly revised analytical model for Heterojunction Gate All Around (HJGAA) TFET is demonstrated using a 2D parabolic approximation equation. Analytical expressions are derived for both potential distribution and field distribution using appropriate boundary conditions. This distribution of electric fields is further used to measure the rate of tunneling output, and then we have extracted the drain current numerically. The findings indicate a substantial change in the drain current characteristics while reducing the SCE impacts to a considerable amount. Feasibility of the newly updated model is verified by comparing the results of the analytical model with the results of TCAD simulator.","PeriodicalId":45186,"journal":{"name":"International Journal of Computational Materials Science and Engineering","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43853864","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：