Pub Date : 2021-07-09DOI: 10.33422/2nd.retconf.2021.07.70
Mai Hoang Long
{"title":"Study on Recovery, Accumulation and Reuse of Kinetic Energy When Going downhill to Support the Departure and Upward Movement of Small-Sized Timber Tractor complexes","authors":"Mai Hoang Long","doi":"10.33422/2nd.retconf.2021.07.70","DOIUrl":"https://doi.org/10.33422/2nd.retconf.2021.07.70","url":null,"abstract":"","PeriodicalId":415650,"journal":{"name":"Proceedings of The 2nd International Academic Conference on Research in Engineering and Technology","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133080223","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 : 2021-07-09DOI: 10.33422/2nd.retconf.2021.07.76
Sefia Brahim
A detailed theoretical study of electronic absorption spectra of Ni(II) complexes in a distorted square planar form. Such complexes have been the goal of several researches due to their special properties in many aspects; they are investigated in terms of their pertinence for use in DSSCs. We investigated the electronic structures and UV-Vis spectra of Ni(II) complexes with density functional theory (DFT) and time-dependent density functional theory (TDDFT) calculations with CAM-B3LYP and PBE0 hybrid functional. Moreover, the analysis of the frontier molecular orbitals (FMOs) which allowed a detailed assignment to interpret the electronic transitions of the calculated spectral properties. The influences of functional, substitution and solvent on electronic spectra have been assessed. According to the computed results, the geometry optimization was in good agreement with the experimental results from X-ray diffraction. The theoretical calculations reproduce the main observed spectroscopic proprieties and substituent effects of ecda and dtc ligands on the absorption spectra. As experimentally observed, computations results reveal that all complexes show a tree absorption bands in UV region and very low absorption one in visible region. We have assigned these bands to the electronic transitions answerable for their appearance; they are characterized by mixed character mainly dominated by MLCT and LLCT character.
{"title":"Electronic absorption spectra of nickel (II) complexes used for sensitized solar cells: DFT/TDDFT Study","authors":"Sefia Brahim","doi":"10.33422/2nd.retconf.2021.07.76","DOIUrl":"https://doi.org/10.33422/2nd.retconf.2021.07.76","url":null,"abstract":"A detailed theoretical study of electronic absorption spectra of Ni(II) complexes in a distorted square planar form. Such complexes have been the goal of several researches due to their special properties in many aspects; they are investigated in terms of their pertinence for use in DSSCs. We investigated the electronic structures and UV-Vis spectra of Ni(II) complexes with density functional theory (DFT) and time-dependent density functional theory (TDDFT) calculations with CAM-B3LYP and PBE0 hybrid functional. Moreover, the analysis of the frontier molecular orbitals (FMOs) which allowed a detailed assignment to interpret the electronic transitions of the calculated spectral properties. The influences of functional, substitution and solvent on electronic spectra have been assessed. According to the computed results, the geometry optimization was in good agreement with the experimental results from X-ray diffraction. The theoretical calculations reproduce the main observed spectroscopic proprieties and substituent effects of ecda and dtc ligands on the absorption spectra. As experimentally observed, computations results reveal that all complexes show a tree absorption bands in UV region and very low absorption one in visible region. We have assigned these bands to the electronic transitions answerable for their appearance; they are characterized by mixed character mainly dominated by MLCT and LLCT character.","PeriodicalId":415650,"journal":{"name":"Proceedings of The 2nd International Academic Conference on Research in Engineering and Technology","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114810427","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 : 2021-07-09DOI: 10.33422/2nd.retconf.2021.07.94
D. Simonet
Thailand is known as a top producer of many essential agricultural commodities including canary seeds, cassava, mango, mangosteen, guava, and chili pepper. Due to global warming and population growth, droughts are increasing and water is becoming scarce, which have a direct impact on agriculture. Farmers are therefore facing difficulties in supplying their crops with sufficient water due to water scarcity and the increasing irrigation cost. This situation calls for optimal use of irrigation water in agriculture, which is sufficient to avoid crop water stress and at the same time help to sustain water and reduce irrigation expenses. Methodolgy/approach: With the number of smartphone users in the world exceeding 3.5 billion, this app uses geospatial data and the Water Balance Approach to estimate the optimal irrigation cycle in the current month in Thailand using Java. Result: This app would result in significant water savings and a less costly irrigation process for both large farms and private gardens in subsistence agriculture. Conclusion: The proposed smartphone app captures the unique characteristics of the weather and soil conditions of any location in Thailand to determine the optimal average daily amount of water required to prevent crop water stress in the current month.
{"title":"Smart Phone Evapotranspiration-Based App for Optimal Irrigation Scheduling for Thai Crops","authors":"D. Simonet","doi":"10.33422/2nd.retconf.2021.07.94","DOIUrl":"https://doi.org/10.33422/2nd.retconf.2021.07.94","url":null,"abstract":"Thailand is known as a top producer of many essential agricultural commodities including canary seeds, cassava, mango, mangosteen, guava, and chili pepper. Due to global warming and population growth, droughts are increasing and water is becoming scarce, which have a direct impact on agriculture. Farmers are therefore facing difficulties in supplying their crops with sufficient water due to water scarcity and the increasing irrigation cost. This situation calls for optimal use of irrigation water in agriculture, which is sufficient to avoid crop water stress and at the same time help to sustain water and reduce irrigation expenses. Methodolgy/approach: With the number of smartphone users in the world exceeding 3.5 billion, this app uses geospatial data and the Water Balance Approach to estimate the optimal irrigation cycle in the current month in Thailand using Java. Result: This app would result in significant water savings and a less costly irrigation process for both large farms and private gardens in subsistence agriculture. Conclusion: The proposed smartphone app captures the unique characteristics of the weather and soil conditions of any location in Thailand to determine the optimal average daily amount of water required to prevent crop water stress in the current month.","PeriodicalId":415650,"journal":{"name":"Proceedings of The 2nd International Academic Conference on Research in Engineering and Technology","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116167382","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 : 2021-07-09DOI: 10.33422/2nd.retconf.2021.07.88
M. Karatas
Due to their efficient and sustainable natures, hydrogen fuel cell vehicles are expected to replace traditional gasoline internal combustion engine vehicles in the future. The increasing number of hydrogen fueled vehicles rises the need for installing additional hydrogen fuel storage areas to serve as suppliers for the fuel retail stations in city centers. With this requirement, planners face the problem of locating and sizing hydrogen storage areas. These storage areas are semi-desirable in nature since they pose both social and transportation costs to the nearby communities. In this study, we tackle the location and sizing problem of hydrogen energy storage areas and propose a bi-objective integer linear model. Adopting a goal programming modelling framework, we minimize the total weighted unwanted deviations from each goal, i.e. minimizing transportation cost and social disutility. We demonstrate the performance of our modelling framework on a case study for the Anatolian side of Istanbul, Turkey. We also implement a posteriori approach and determine an efficient frontier to assist decision-makers and investors.
{"title":"Location Models for Alternative Fuel Stations: A Brief Survey","authors":"M. Karatas","doi":"10.33422/2nd.retconf.2021.07.88","DOIUrl":"https://doi.org/10.33422/2nd.retconf.2021.07.88","url":null,"abstract":"Due to their efficient and sustainable natures, hydrogen fuel cell vehicles are expected to replace traditional gasoline internal combustion engine vehicles in the future. The increasing number of hydrogen fueled vehicles rises the need for installing additional hydrogen fuel storage areas to serve as suppliers for the fuel retail stations in city centers. With this requirement, planners face the problem of locating and sizing hydrogen storage areas. These storage areas are semi-desirable in nature since they pose both social and transportation costs to the nearby communities. In this study, we tackle the location and sizing problem of hydrogen energy storage areas and propose a bi-objective integer linear model. Adopting a goal programming modelling framework, we minimize the total weighted unwanted deviations from each goal, i.e. minimizing transportation cost and social disutility. We demonstrate the performance of our modelling framework on a case study for the Anatolian side of Istanbul, Turkey. We also implement a posteriori approach and determine an efficient frontier to assist decision-makers and investors.","PeriodicalId":415650,"journal":{"name":"Proceedings of The 2nd International Academic Conference on Research in Engineering and Technology","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124836543","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 : 2021-07-09DOI: 10.33422/2nd.retconf.2021.07.82
Azad A. Mohammed
The growth of post consumed plastic wastes requires recycling to save the environment against pollution. One solution is the reuse of the waste as a substantially material for concrete production. Different properties of concrete containing different plastic wastes have been investigated by the past researchers. In this study, impact strength and behavior of normal strength concrete contained shredded PVC waste aggregate or PET waste fiber has been investigated experimentally. Results show that there is a first crack impact and ultimate impact loads enhancement of 97% and 23% as a result of using 20 mm length PET fiber added to concrete by 0.75%. The impact performance of 40 mm length PET fiber was found to be lower as compared with that of 20 mm length fiber to enhance impact. There is a reduction in both first crack impact and ultimate load impact of concrete as a result of replacing a part of fine aggregate with a PVC waste aggregate reaching 84% related to using 45% PVC aggregate as fine aggregate replacement. Results also show that there is a strong linear relationship between the first crack impact and ultimate load impact for concrete contained PET fiber or PVC aggregate.
{"title":"Impact strength and behavior of concrete containing different plastic wastes","authors":"Azad A. Mohammed","doi":"10.33422/2nd.retconf.2021.07.82","DOIUrl":"https://doi.org/10.33422/2nd.retconf.2021.07.82","url":null,"abstract":"The growth of post consumed plastic wastes requires recycling to save the environment against pollution. One solution is the reuse of the waste as a substantially material for concrete production. Different properties of concrete containing different plastic wastes have been investigated by the past researchers. In this study, impact strength and behavior of normal strength concrete contained shredded PVC waste aggregate or PET waste fiber has been investigated experimentally. Results show that there is a first crack impact and ultimate impact loads enhancement of 97% and 23% as a result of using 20 mm length PET fiber added to concrete by 0.75%. The impact performance of 40 mm length PET fiber was found to be lower as compared with that of 20 mm length fiber to enhance impact. There is a reduction in both first crack impact and ultimate load impact of concrete as a result of replacing a part of fine aggregate with a PVC waste aggregate reaching 84% related to using 45% PVC aggregate as fine aggregate replacement. Results also show that there is a strong linear relationship between the first crack impact and ultimate load impact for concrete contained PET fiber or PVC aggregate.","PeriodicalId":415650,"journal":{"name":"Proceedings of The 2nd International Academic Conference on Research in Engineering and Technology","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131961471","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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