The Shandong Water Conservancy Engineering Machinery General Factory is a specialized factory for the production of engineering machinery, approvcd by the Ministry of Water Resources. It was one of the first specializ...The Shandong Water Conservancy Engineering Machinery General Factory is a specialized factory for the production of engineering machinery, approvcd by the Ministry of Water Resources. It was one of the first specialized factories for the production of wheel loaders. Wheel loaders have been produced by the factory for about 20 years, and it has formed the Wild Ox brand 13 ton small and medium-sized loader series. These products sell well展开更多
In this paper, the (2+l)-dimensional generalization of shallow water wave equation, which may be used to describe the propagation of ocean waves, is analytically investigated. With the aid of symbolic computation, ...In this paper, the (2+l)-dimensional generalization of shallow water wave equation, which may be used to describe the propagation of ocean waves, is analytically investigated. With the aid of symbolic computation, we prove that the (2+ l)-dimensional generalization of shallow water wave equation possesses the Palnlev6 property under a certain condition, and its Lax pair is constructed by applying the singular manifold method. Based on the obtained Lax representation, the Darboux transformation (DT) is constructed. The first iterated solution, second iterated solution and a special N-soliton solution with an arbitrary function are derived with the resulting DT. Relevant properties are graphically illustrated, which might be helpful to understanding the propagation processes for ocean waves in shallow water.展开更多
Beijing-Tianjin-Hebei region is connected by geography and water veins with strong complementary advantages.The coordinated development of Beijing,Tianjin and Hebei is a major national strategy put forward by the Chin...Beijing-Tianjin-Hebei region is connected by geography and water veins with strong complementary advantages.The coordinated development of Beijing,Tianjin and Hebei is a major national strategy put forward by the Chinese government in the new historical period.However,Beijing,Tianjin and Hebei are faced with common problems such as water shortage,serious water pollution,over-exploitation of groundwater and fragile water ecology.The synergy governance of water resources is the basis and key issue behind the coordinated development of the tree areas.This paper analyzes the water problem in Beijing-Tianjin-Hebei region and the status of water resources accounting and discusses the basic ideas of inspecting water resources management and innovating water accounting system.In this paper,a fi ne,standardized,water accounting system is established,which is permitted for inter-sustainable use of water resources.On this basis,this paper proposes to keep in line with Australian water accounting standards and to establish General Purpose Water Accounting for disclosure of water accounting reports,based on accrual basis,so as to build a new mechanism of coordinated governance of Beijing-Tianjin-Hebei water resources.Finally,in order to demonstrate the optimization mechanism of Beijing-Tianjin-Hebei water resources coordinated management,this paper applies General Purpose Water Accounting to Beijing Waterworks Group Co.,Ltd.展开更多
文摘The Shandong Water Conservancy Engineering Machinery General Factory is a specialized factory for the production of engineering machinery, approvcd by the Ministry of Water Resources. It was one of the first specialized factories for the production of wheel loaders. Wheel loaders have been produced by the factory for about 20 years, and it has formed the Wild Ox brand 13 ton small and medium-sized loader series. These products sell well
基金Supported by the National Natural Science Foundation of China under Grant No.61072145the Scientific Research Common Program of Beijing Municipal Commission of Education under Grant No.SQKM201211232016
文摘In this paper, the (2+l)-dimensional generalization of shallow water wave equation, which may be used to describe the propagation of ocean waves, is analytically investigated. With the aid of symbolic computation, we prove that the (2+ l)-dimensional generalization of shallow water wave equation possesses the Palnlev6 property under a certain condition, and its Lax pair is constructed by applying the singular manifold method. Based on the obtained Lax representation, the Darboux transformation (DT) is constructed. The first iterated solution, second iterated solution and a special N-soliton solution with an arbitrary function are derived with the resulting DT. Relevant properties are graphically illustrated, which might be helpful to understanding the propagation processes for ocean waves in shallow water.
基金funded by Beijing Social Science Fund(18GLB012)Social Science Fund of Beijing Education Commission(SM201810037004).
文摘Beijing-Tianjin-Hebei region is connected by geography and water veins with strong complementary advantages.The coordinated development of Beijing,Tianjin and Hebei is a major national strategy put forward by the Chinese government in the new historical period.However,Beijing,Tianjin and Hebei are faced with common problems such as water shortage,serious water pollution,over-exploitation of groundwater and fragile water ecology.The synergy governance of water resources is the basis and key issue behind the coordinated development of the tree areas.This paper analyzes the water problem in Beijing-Tianjin-Hebei region and the status of water resources accounting and discusses the basic ideas of inspecting water resources management and innovating water accounting system.In this paper,a fi ne,standardized,water accounting system is established,which is permitted for inter-sustainable use of water resources.On this basis,this paper proposes to keep in line with Australian water accounting standards and to establish General Purpose Water Accounting for disclosure of water accounting reports,based on accrual basis,so as to build a new mechanism of coordinated governance of Beijing-Tianjin-Hebei water resources.Finally,in order to demonstrate the optimization mechanism of Beijing-Tianjin-Hebei water resources coordinated management,this paper applies General Purpose Water Accounting to Beijing Waterworks Group Co.,Ltd.