This survey is concerned with the new developments on existence and uniqueness of solutions of some basic models in atmospheric dynamics, such as two-and three-dimensional quasi-geostrophic models and three-dimensiona...This survey is concerned with the new developments on existence and uniqueness of solutions of some basic models in atmospheric dynamics, such as two-and three-dimensional quasi-geostrophic models and three-dimensional balanced model. The main aim of this paper is to introduce some results about the global and local (with respect to time) existence of solutions given by the authors in recent years, but others' important contributions and the literature on this subject are also quoted. We discuss briefly the relationships among the existence and uniqueness, physical instability and computational instability. In the appendixes, some key mathematical techniques in obtaining our results are presented, which are of vital importance to other problems in geophysical fluid dynamics as well.展开更多
This paper describes the major problems that Metropolitan Area Network(MAN)is facing and presents basic requirements of the next generation MAN.It presents four technical solutions:SDH,Ethernet, Resilient Packet Ring ...This paper describes the major problems that Metropolitan Area Network(MAN)is facing and presents basic requirements of the next generation MAN.It presents four technical solutions:SDH,Ethernet, Resilient Packet Ring and WDM Multiservice Platform.Based on the analysis of these solutions,it is concluded that the above technologies should be used together and different technologies should be employed under different circumstances to make an integrated solution for MAN,while SDH multiservice will play a center role in the near future.展开更多
I. The Current Situation ofOur Real Estate Industry According to the findings of a nationalsurvey in urban housing conducted in 1985,the total urban floor area of the whole coun-try has reached 4.676 billion square me...I. The Current Situation ofOur Real Estate Industry According to the findings of a nationalsurvey in urban housing conducted in 1985,the total urban floor area of the whole coun-try has reached 4.676 billion square meters,among which industrial buildings occupied1.353 billion square meters, commercialbuildings 0.388 billion, cultural and educa-展开更多
文摘This survey is concerned with the new developments on existence and uniqueness of solutions of some basic models in atmospheric dynamics, such as two-and three-dimensional quasi-geostrophic models and three-dimensional balanced model. The main aim of this paper is to introduce some results about the global and local (with respect to time) existence of solutions given by the authors in recent years, but others' important contributions and the literature on this subject are also quoted. We discuss briefly the relationships among the existence and uniqueness, physical instability and computational instability. In the appendixes, some key mathematical techniques in obtaining our results are presented, which are of vital importance to other problems in geophysical fluid dynamics as well.
文摘This paper describes the major problems that Metropolitan Area Network(MAN)is facing and presents basic requirements of the next generation MAN.It presents four technical solutions:SDH,Ethernet, Resilient Packet Ring and WDM Multiservice Platform.Based on the analysis of these solutions,it is concluded that the above technologies should be used together and different technologies should be employed under different circumstances to make an integrated solution for MAN,while SDH multiservice will play a center role in the near future.
文摘I. The Current Situation ofOur Real Estate Industry According to the findings of a nationalsurvey in urban housing conducted in 1985,the total urban floor area of the whole coun-try has reached 4.676 billion square meters,among which industrial buildings occupied1.353 billion square meters, commercialbuildings 0.388 billion, cultural and educa-
