The Reynolds-averaged Navier–Stokes(RANS)equation was solved using computational fluid dynamics to study the effect of the circulating tank wall on the hydrodynamic coefficient of an autonomous underwater vehicle(AUV...The Reynolds-averaged Navier–Stokes(RANS)equation was solved using computational fluid dynamics to study the effect of the circulating tank wall on the hydrodynamic coefficient of an autonomous underwater vehicle(AUV).Numerical results were compared with the experimental results in the circulating water tank of Harbin Engineering University.The numerical results of the model with different scale ratios under the same water in the flume were studied to investigate the effect of blockage on the hydrodynamic performance of AUV in the circulating flume model test.The results show that the hydrodynamic coefficient is stable with the scale reduction of the model.The influence of blocking effect on AUV is given by combining theoretical calculation with experiment.展开更多
There is growing needs for web based GIS for easy and fast dissemination, sharing, displaying and processing of spatial information which in turns helping in decision making for various natural resources based applica...There is growing needs for web based GIS for easy and fast dissemination, sharing, displaying and processing of spatial information which in turns helping in decision making for various natural resources based applications. In order to make a cost effective implementation, operation and maintenance of spatial information over the web, a cheaper yet feature rich alternative to commercial software is required which can be fulfilled by Open Source GIS software. This paper conveys an efficient approach to customize and integrate an open source web GIS system based on Mapserver as a web GIS server and PostgreSQL/PostGIS as an object oriented relational database management system (ORDBMS) for effective dissemination, sharing and management of spatial information over the internet. An open source web application tool built on top of MapScript using the PHP programming language has been used as for development of interactive user interface. The configurable Web Mapping Client Components (CWC2) tags have been added to HTML template pages in order to deploy the mapping contents to a web application. It is observed that the present system developed using open source software enables user to view, update, customized retrieval, query and analysis of natural resources information for specific needs.展开更多
The key developments in Indian Irrigation sector have been presented by briefly discussing the following topics:1.Present Indian Irrigation Challenges and Way Forward.2.Regulatory Interventions in Water Sector in Indi...The key developments in Indian Irrigation sector have been presented by briefly discussing the following topics:1.Present Indian Irrigation Challenges and Way Forward.2.Regulatory Interventions in Water Sector in India(Maharashtra’s Example).3.Roles and Activities of Maharashtra Water Resource Regulatory Authority(MWRRA).4.Major Achievements of MWRRA.5.Indian National Committee On Irrigation and Drainage(INCID).6.Irrigation,Command Area Development and Micro Irrigation in India.7.Flood Management and Its Measures.8.Capacity Building.展开更多
Due to global warming, the need to secure an alternative resource has become more important nationally. With the high tidal range of up to 9.7 m on the west coast of Korea, numerous tidal current projects are being pl...Due to global warming, the need to secure an alternative resource has become more important nationally. With the high tidal range of up to 9.7 m on the west coast of Korea, numerous tidal current projects are being planned and constructed. To extract a significant quantity of power, a tidal current farm with a multi-arrangement is necessary in the ocean. The rotor, which initially converts the energy, is a very important component because it affects the efficiency of the entire system, and its performance is determined by various design variables. The power generation is strongly dependent on the size of the rotor and the incoming flow velocity. However, the interactions between devices also contribute significantly to the total power capacity. Therefore, rotor performance considering the interaction problems needs to be investigated for generating maximum power in a specific field. This paper documents a performance study of devices considering the interference between rotating rotors with axial, transverse and diagonal arrangements.展开更多
CHINESE Women’s College (CWC) is China’s only state-run women’s institution of higher learning. The college lays equal stress on higher education and supplementary adult education, training mid-and highlevel women ...CHINESE Women’s College (CWC) is China’s only state-run women’s institution of higher learning. The college lays equal stress on higher education and supplementary adult education, training mid-and highlevel women administrators and professionals.展开更多
基金Supported by the National Natural Science Foundation of China(Grant No.51909040)the Fund of Science and Technology on Underwater Vehicle Technology(Grant No.JCKYS2022SXJQR-11)+1 种基金the Heilongjiang Provincial Natural Science Foundation of China(Grant No.LH2020E073)the Key Technology Research and Development Program of Shandong(Grant No.2020CXGC010702).
文摘The Reynolds-averaged Navier–Stokes(RANS)equation was solved using computational fluid dynamics to study the effect of the circulating tank wall on the hydrodynamic coefficient of an autonomous underwater vehicle(AUV).Numerical results were compared with the experimental results in the circulating water tank of Harbin Engineering University.The numerical results of the model with different scale ratios under the same water in the flume were studied to investigate the effect of blockage on the hydrodynamic performance of AUV in the circulating flume model test.The results show that the hydrodynamic coefficient is stable with the scale reduction of the model.The influence of blocking effect on AUV is given by combining theoretical calculation with experiment.
文摘There is growing needs for web based GIS for easy and fast dissemination, sharing, displaying and processing of spatial information which in turns helping in decision making for various natural resources based applications. In order to make a cost effective implementation, operation and maintenance of spatial information over the web, a cheaper yet feature rich alternative to commercial software is required which can be fulfilled by Open Source GIS software. This paper conveys an efficient approach to customize and integrate an open source web GIS system based on Mapserver as a web GIS server and PostgreSQL/PostGIS as an object oriented relational database management system (ORDBMS) for effective dissemination, sharing and management of spatial information over the internet. An open source web application tool built on top of MapScript using the PHP programming language has been used as for development of interactive user interface. The configurable Web Mapping Client Components (CWC2) tags have been added to HTML template pages in order to deploy the mapping contents to a web application. It is observed that the present system developed using open source software enables user to view, update, customized retrieval, query and analysis of natural resources information for specific needs.
文摘The key developments in Indian Irrigation sector have been presented by briefly discussing the following topics:1.Present Indian Irrigation Challenges and Way Forward.2.Regulatory Interventions in Water Sector in India(Maharashtra’s Example).3.Roles and Activities of Maharashtra Water Resource Regulatory Authority(MWRRA).4.Major Achievements of MWRRA.5.Indian National Committee On Irrigation and Drainage(INCID).6.Irrigation,Command Area Development and Micro Irrigation in India.7.Flood Management and Its Measures.8.Capacity Building.
基金the outcome of a Manpower Development Program for Ma-rine Energy by the Ministry of Land, Transport and Maritime Affairs (MLTM) supported by New & Renewable Energy R&D Program (Grant No 20093021070010) under the Ministry of Knowledge Economy, Repub-lic of Korea.
文摘Due to global warming, the need to secure an alternative resource has become more important nationally. With the high tidal range of up to 9.7 m on the west coast of Korea, numerous tidal current projects are being planned and constructed. To extract a significant quantity of power, a tidal current farm with a multi-arrangement is necessary in the ocean. The rotor, which initially converts the energy, is a very important component because it affects the efficiency of the entire system, and its performance is determined by various design variables. The power generation is strongly dependent on the size of the rotor and the incoming flow velocity. However, the interactions between devices also contribute significantly to the total power capacity. Therefore, rotor performance considering the interaction problems needs to be investigated for generating maximum power in a specific field. This paper documents a performance study of devices considering the interference between rotating rotors with axial, transverse and diagonal arrangements.
文摘CHINESE Women’s College (CWC) is China’s only state-run women’s institution of higher learning. The college lays equal stress on higher education and supplementary adult education, training mid-and highlevel women administrators and professionals.
