Yangtze Estuary Tidal Wetlands Geographic Information System (YETWGIS) is a comprehensive software system for environmental management and decision of Yangtze estuary tidal wetlands. Based on MapObjects components tec...Yangtze Estuary Tidal Wetlands Geographic Information System (YETWGIS) is a comprehensive software system for environmental management and decision of Yangtze estuary tidal wetlands. Based on MapObjects components technology, Data Mining technology, mathematical modeling method and Visual Basic language, this software system has many functions such as displaying, editing, querying and searching, spatial statistics and analysis, thematic map compiling, and environmental quality evaluation. This paper firstly outlined the system structure, key techniques, and achieving methods of YETWGIS, and then, described the core modules (the thematic map compiling module and environmental quality evaluation model module) in detail. In addition, based on information entropy model, it thoroughly discussed the methods of environmental quality evaluation and indicators' weight calculation. Finally, by using YETWGIS, this paper analyzed the spatial distribution characteristics of Heavy Metal and Persistent Organic Pollutants (POPs) of the Yangtze estuary tidal wetlands in 2002, and evaluated the environmental quality of the Yangtze estuary tidal wetlands in 2003.展开更多
Sheet metal dieless forming is a new metal forming technology. Thistechnology adopts the principle of rapid prototyping technology, so it can form sheet metal partswithout traditional die and moulds. According to the ...Sheet metal dieless forming is a new metal forming technology. Thistechnology adopts the principle of rapid prototyping technology, so it can form sheet metal partswithout traditional die and moulds. According to the characteristic of sheet metal dieless formingtechnology a new way of tool path generation based on the STL file for sheet metal dieless formingis proposed.展开更多
The ceramic/metal gradient thermal barrier coatings (CMGTBCs) which combined the conceptions of thermal barrier coatings (TBCs) and functional gradient materials (FGMs) are investigated.The structure model studied in ...The ceramic/metal gradient thermal barrier coatings (CMGTBCs) which combined the conceptions of thermal barrier coatings (TBCs) and functional gradient materials (FGMs) are investigated.The structure model studied in this paper is a general model which includes four different layers:pure ceramic layer,ceramic/metal gradient layer,pure metal layer,and substrate layer.The microstructures of gradient layer have different ceramics and metal volume fraction profile along with the direction of thickness.The profile function used to describe the gradient microstructures can be expressed in power-law or polynomial expression.The mechanical properties of CMGTBCs are obtained by means of microscopic mechanics.As special cases,the interactive solutions are given by Mori-Tanaka method,and the non-interactive solutions by dilute solution.The Young's modulus calculated by these methods are compared with those by other methods,e g,the rule of mixtures.展开更多
An BP neural-network-based adaptive control (NNAC) design method is described whose aim is to control a class of partially unknown nonlinear systems. Making use of the online identification of BP neural networks, the ...An BP neural-network-based adaptive control (NNAC) design method is described whose aim is to control a class of partially unknown nonlinear systems. Making use of the online identification of BP neural networks, the results of the identification could be used into the parameters of the controller. Not only the strong robustness with respect to uncertain dynamics and nonlinearities can be obtained, but also the output tracking error between the plant output and the desired reference output can asymptotically converge to zero by Lyapunov theory in the process of this design method. And a simulation example is also presented to evaluate the effectiveness of the design.展开更多
The geometries of the molecules of eight organic additives were optimized and the net charge,E HOMO andE LUMO were obtained using AM method, respectively. The result shows that there is the correlation between the lev...The geometries of the molecules of eight organic additives were optimized and the net charge,E HOMO andE LUMO were obtained using AM method, respectively. The result shows that there is the correlation between the leveling property and the frontier orbital energy levels of these additives, and the adsorption models and leveling mechanics were discussed. The rule between the frontier orbital energy levels and the leveling property is verified by the experiments.展开更多
基金National Natural Science Foundation of China No.40131020 No.40173030 Shanghai Science Committee and Environmental Bureau Program Shanghai Basic Science Research Key Program No.02DJ14029 Foundation for the Excellent You
文摘Yangtze Estuary Tidal Wetlands Geographic Information System (YETWGIS) is a comprehensive software system for environmental management and decision of Yangtze estuary tidal wetlands. Based on MapObjects components technology, Data Mining technology, mathematical modeling method and Visual Basic language, this software system has many functions such as displaying, editing, querying and searching, spatial statistics and analysis, thematic map compiling, and environmental quality evaluation. This paper firstly outlined the system structure, key techniques, and achieving methods of YETWGIS, and then, described the core modules (the thematic map compiling module and environmental quality evaluation model module) in detail. In addition, based on information entropy model, it thoroughly discussed the methods of environmental quality evaluation and indicators' weight calculation. Finally, by using YETWGIS, this paper analyzed the spatial distribution characteristics of Heavy Metal and Persistent Organic Pollutants (POPs) of the Yangtze estuary tidal wetlands in 2002, and evaluated the environmental quality of the Yangtze estuary tidal wetlands in 2003.
基金This project is supported by National Natural Science Foundation of China(No.50175034).
文摘Sheet metal dieless forming is a new metal forming technology. Thistechnology adopts the principle of rapid prototyping technology, so it can form sheet metal partswithout traditional die and moulds. According to the characteristic of sheet metal dieless formingtechnology a new way of tool path generation based on the STL file for sheet metal dieless formingis proposed.
基金FundedbytheNationalNaturalScienceFoundationofChi na (No .5 94 0 5 0 0 9) .
文摘The ceramic/metal gradient thermal barrier coatings (CMGTBCs) which combined the conceptions of thermal barrier coatings (TBCs) and functional gradient materials (FGMs) are investigated.The structure model studied in this paper is a general model which includes four different layers:pure ceramic layer,ceramic/metal gradient layer,pure metal layer,and substrate layer.The microstructures of gradient layer have different ceramics and metal volume fraction profile along with the direction of thickness.The profile function used to describe the gradient microstructures can be expressed in power-law or polynomial expression.The mechanical properties of CMGTBCs are obtained by means of microscopic mechanics.As special cases,the interactive solutions are given by Mori-Tanaka method,and the non-interactive solutions by dilute solution.The Young's modulus calculated by these methods are compared with those by other methods,e g,the rule of mixtures.
文摘An BP neural-network-based adaptive control (NNAC) design method is described whose aim is to control a class of partially unknown nonlinear systems. Making use of the online identification of BP neural networks, the results of the identification could be used into the parameters of the controller. Not only the strong robustness with respect to uncertain dynamics and nonlinearities can be obtained, but also the output tracking error between the plant output and the desired reference output can asymptotically converge to zero by Lyapunov theory in the process of this design method. And a simulation example is also presented to evaluate the effectiveness of the design.
基金The National Natural Science Foundation of China(59331030)
文摘The geometries of the molecules of eight organic additives were optimized and the net charge,E HOMO andE LUMO were obtained using AM method, respectively. The result shows that there is the correlation between the leveling property and the frontier orbital energy levels of these additives, and the adsorption models and leveling mechanics were discussed. The rule between the frontier orbital energy levels and the leveling property is verified by the experiments.
