This work aims to control pulsed power for biomedical fields, which demands sensitive parameters. The pulsed power consists of a voltage rise time of less than 50 ns and charging energy to 1.0 J/pulse; also, the pulse...This work aims to control pulsed power for biomedical fields, which demands sensitive parameters. The pulsed power consists of a voltage rise time of less than 50 ns and charging energy to 1.0 J/pulse; also, the pulse control area includes pulse interval pulse shot number, output voltage. To achieve this system, a pulsed power system exists including software running on PC, universal serial bus （UgB~ for connection, and FPGA controller. Using the software for complex control of pulsed power will enable expansion into various fields with easy operation.展开更多
The paper analyses the changes in the China＇s auto industry, showing how the rapid growth in production and sales between 2000 and 2008 came largely from the economic growth. The emergence of homegrown assemblers str...The paper analyses the changes in the China＇s auto industry, showing how the rapid growth in production and sales between 2000 and 2008 came largely from the economic growth. The emergence of homegrown assemblers strengthened fierce competition for all assemblers and resulted in the spreading of regional auto production networks with linkage to leading international automakers. This move integrated China＇s major regional production into the global chain and speeded up technology spillovers in the automobile industry. The paper reveals how the relationships between homegrown makers and joint ventures have been coordinated within the framework of local production networks, which turn out to have a highly localized production capacity. Furthermore, the results stand testimony for the fact that China＇s auto industry is becoming competitive through learning-by-doing. In the future outlook, the growing economy in China will be the most influential driving force to shift the global auto industry into China, which will turn out to be a super auto giant in the coming decade.展开更多
A dynamic model is established for an offset-disc rotor system with a mechanical gear coupling, which takes into consideration the nonlinear restoring force of rotor support and the effect of coupling misalignment. Pe...A dynamic model is established for an offset-disc rotor system with a mechanical gear coupling, which takes into consideration the nonlinear restoring force of rotor support and the effect of coupling misalignment. Periodic solutions are obtained through harmonic balance method with alternating frequency/time domain(HB-AFT) technique, and then compared with the results of numerical simulation. Good agreement confirms the feasibility of HB-AFT scheme. Moreover, the Floquet theory is adopted to analyze motion stability of the system when rotor runs at different speed intervals. A simple strategy to determine the monodromy matrix is introduced and two ways towards unstability are found for periodic solutions: the period doubling bifurcation and the secondary Hopf bifurcation. The results obtained will contribute to the global response analysis and dynamic optimal design of rotor systems.展开更多
文摘This work aims to control pulsed power for biomedical fields, which demands sensitive parameters. The pulsed power consists of a voltage rise time of less than 50 ns and charging energy to 1.0 J/pulse; also, the pulse control area includes pulse interval pulse shot number, output voltage. To achieve this system, a pulsed power system exists including software running on PC, universal serial bus （UgB~ for connection, and FPGA controller. Using the software for complex control of pulsed power will enable expansion into various fields with easy operation.
文摘The paper analyses the changes in the China＇s auto industry, showing how the rapid growth in production and sales between 2000 and 2008 came largely from the economic growth. The emergence of homegrown assemblers strengthened fierce competition for all assemblers and resulted in the spreading of regional auto production networks with linkage to leading international automakers. This move integrated China＇s major regional production into the global chain and speeded up technology spillovers in the automobile industry. The paper reveals how the relationships between homegrown makers and joint ventures have been coordinated within the framework of local production networks, which turn out to have a highly localized production capacity. Furthermore, the results stand testimony for the fact that China＇s auto industry is becoming competitive through learning-by-doing. In the future outlook, the growing economy in China will be the most influential driving force to shift the global auto industry into China, which will turn out to be a super auto giant in the coming decade.
基金supported by the National Basic Research Program of China("973" Project)(Grant No.2015CB057400)the National Natural Science Foundation of China(Grant No.11302058)
文摘A dynamic model is established for an offset-disc rotor system with a mechanical gear coupling, which takes into consideration the nonlinear restoring force of rotor support and the effect of coupling misalignment. Periodic solutions are obtained through harmonic balance method with alternating frequency/time domain(HB-AFT) technique, and then compared with the results of numerical simulation. Good agreement confirms the feasibility of HB-AFT scheme. Moreover, the Floquet theory is adopted to analyze motion stability of the system when rotor runs at different speed intervals. A simple strategy to determine the monodromy matrix is introduced and two ways towards unstability are found for periodic solutions: the period doubling bifurcation and the secondary Hopf bifurcation. The results obtained will contribute to the global response analysis and dynamic optimal design of rotor systems.
