In the traditional tracking, telemetry and telecommand (TT&C) for satellite missions, it is necessary and suitable to choose the centralized control mode, due to the limited number of satellites requiring few grou...In the traditional tracking, telemetry and telecommand (TT&C) for satellite missions, it is necessary and suitable to choose the centralized control mode, due to the limited number of satellites requiring few ground stations, low ground processing complexity;relatively simple space tasks requiring low ground-based TT&C coverage percentage, which gives the ability to complete the TT&C services during contact periods. Furthermore, in the past the satellite is limited by the on-orbit processing capability, which requires the mission center to supervise the work status of the satellite.展开更多
1-15 Martin F.PRICE,TorARNESEN,Erik GL0ERSEN,Marc J.METZGER,Mapping mountain areas:learning from Global,European and Norwegian perspectives,16-29 Peter NOJAROV,Emil GACHEV,Karsten GRUNEWALD,Recent behavior and possibl...1-15 Martin F.PRICE,TorARNESEN,Erik GL0ERSEN,Marc J.METZGER,Mapping mountain areas:learning from Global,European and Norwegian perspectives,16-29 Peter NOJAROV,Emil GACHEV,Karsten GRUNEWALD,Recent behavior and possible future evolution of the glacieret in the cirque Golemiya Kazan in the Pirin Mountains under conditions of climate warming.展开更多
Through the development in the past 20 years, the compliant mechanism has become an important branch of modern mechanisms and is widely applied in such fields as precision engineering and robotics. Although a series o...Through the development in the past 20 years, the compliant mechanism has become an important branch of modern mechanisms and is widely applied in such fields as precision engineering and robotics. Although a series of design methods and theories of compliant mechanism have emerged, its design problem is still facing challenge. A comprehensive overview of design methods is provided for compliant mechanisms used for precision applications, usually called flexure mechanisms. Several main approaches to analysis and design of flexure mechanisms, including pseudo-rigid-body model, structural matrix model,展开更多
SEVERAL ISSUES OF SCIENTIFIC DEVELOPMENT OF SAFETY PRODUCTION (INCLUDING SAFETY MANUFACTURING) IN CHINA ZHONG Qunpeng ZHANG Zheng YOU Yiliang (School of Materials Science and Engineering, Beihang University, Beijin...SEVERAL ISSUES OF SCIENTIFIC DEVELOPMENT OF SAFETY PRODUCTION (INCLUDING SAFETY MANUFACTURING) IN CHINA ZHONG Qunpeng ZHANG Zheng YOU Yiliang (School of Materials Science and Engineering, Beihang University, Beijing 100083, China) Abstract: Taking the viewpoint of scientific development on safety produc-展开更多
文摘In the traditional tracking, telemetry and telecommand (TT&C) for satellite missions, it is necessary and suitable to choose the centralized control mode, due to the limited number of satellites requiring few ground stations, low ground processing complexity;relatively simple space tasks requiring low ground-based TT&C coverage percentage, which gives the ability to complete the TT&C services during contact periods. Furthermore, in the past the satellite is limited by the on-orbit processing capability, which requires the mission center to supervise the work status of the satellite.
文摘1-15 Martin F.PRICE,TorARNESEN,Erik GL0ERSEN,Marc J.METZGER,Mapping mountain areas:learning from Global,European and Norwegian perspectives,16-29 Peter NOJAROV,Emil GACHEV,Karsten GRUNEWALD,Recent behavior and possible future evolution of the glacieret in the cirque Golemiya Kazan in the Pirin Mountains under conditions of climate warming.
文摘Through the development in the past 20 years, the compliant mechanism has become an important branch of modern mechanisms and is widely applied in such fields as precision engineering and robotics. Although a series of design methods and theories of compliant mechanism have emerged, its design problem is still facing challenge. A comprehensive overview of design methods is provided for compliant mechanisms used for precision applications, usually called flexure mechanisms. Several main approaches to analysis and design of flexure mechanisms, including pseudo-rigid-body model, structural matrix model,
文摘SEVERAL ISSUES OF SCIENTIFIC DEVELOPMENT OF SAFETY PRODUCTION (INCLUDING SAFETY MANUFACTURING) IN CHINA ZHONG Qunpeng ZHANG Zheng YOU Yiliang (School of Materials Science and Engineering, Beihang University, Beijing 100083, China) Abstract: Taking the viewpoint of scientific development on safety produc-
