Two dynamics modes, named short ablation mode and long ablation mode, are observed in implosion experiments of planar wire array Z pinch on ＇QiangGuang-I＇ facility utilizing an optical streak camera. The long ablati...Two dynamics modes, named short ablation mode and long ablation mode, are observed in implosion experiments of planar wire array Z pinch on ＇QiangGuang-I＇ facility utilizing an optical streak camera. The long ablation mode has a lagged trajectory compared with the short ablation mode. For shot 10035 in a short ablation mode, the initial time of K-shell radiation is consistent with the interaction time for ablation plasma arriving at the centre of wire array, while for shot 10038 in long ablation mode, the initial time of K-shell radiation is about 10 ns earlier. In the two modes, the partial ablation plasma could traverse the wire array plane and then collide in the centre to form a dense plasma column with a diameter of 2.2 mm for shot 10035 and 1.5 mm for shot 10038.展开更多
随着如今智能驾驶的快速发展,线控转向系统(steering-by-wire,SBW)作为其关键的组成部分,正成为汽车技术创新的核心领域之一。相较于传统机械转向系统,SBW通过电子化控制取代方向盘与执行机构间的机械连接,并借助控制器模拟路感反馈至...随着如今智能驾驶的快速发展,线控转向系统(steering-by-wire,SBW)作为其关键的组成部分,正成为汽车技术创新的核心领域之一。相较于传统机械转向系统,SBW通过电子化控制取代方向盘与执行机构间的机械连接,并借助控制器模拟路感反馈至驾驶员。为了模拟出适合驾驶员的路感,通过Matlab/Simulink和Carsim平台,构建了线控转向系统的车辆模型。然后通过计算轮胎上产生的回正力矩,同时加上电动助力转向系统(electric power steering system,EPS)中的助力力矩,得到最后的路感力矩。同时,为了实现路感电流的精确跟踪控制,引入了滑模变结构控制技术。为了缓解系统抖振问题,在滑模控制策略中整合了一种新型趋近律。仿真结果验证了滑模变结构控制在实现路感反馈功能上的优越性。展开更多
We study electron transmission through two impurities in a narrow quantum wire by solving Dyson's equations for single electron Green functions. We have verified that, for the delta-function potential of two impur...We study electron transmission through two impurities in a narrow quantum wire by solving Dyson's equations for single electron Green functions. We have verified that, for the delta-function potential of two impurities, the Green function can be factorized into a product of the ‘free’ Green function and current transmission amplitude. Meanwhile Green function and current transmission amplitude obey Fisher-Lee's relation. An analytical expression of the electron transmission amplitude for intrasubband and intersubband is obtained as a function of Fermi energy and the distance between two impurities. The resonant behavior of the current transmission amplitude are detail discussed.展开更多
文摘Two dynamics modes, named short ablation mode and long ablation mode, are observed in implosion experiments of planar wire array Z pinch on ＇QiangGuang-I＇ facility utilizing an optical streak camera. The long ablation mode has a lagged trajectory compared with the short ablation mode. For shot 10035 in a short ablation mode, the initial time of K-shell radiation is consistent with the interaction time for ablation plasma arriving at the centre of wire array, while for shot 10038 in long ablation mode, the initial time of K-shell radiation is about 10 ns earlier. In the two modes, the partial ablation plasma could traverse the wire array plane and then collide in the centre to form a dense plasma column with a diameter of 2.2 mm for shot 10035 and 1.5 mm for shot 10038.
文摘随着如今智能驾驶的快速发展,线控转向系统(steering-by-wire,SBW)作为其关键的组成部分,正成为汽车技术创新的核心领域之一。相较于传统机械转向系统,SBW通过电子化控制取代方向盘与执行机构间的机械连接,并借助控制器模拟路感反馈至驾驶员。为了模拟出适合驾驶员的路感,通过Matlab/Simulink和Carsim平台,构建了线控转向系统的车辆模型。然后通过计算轮胎上产生的回正力矩,同时加上电动助力转向系统(electric power steering system,EPS)中的助力力矩,得到最后的路感力矩。同时,为了实现路感电流的精确跟踪控制,引入了滑模变结构控制技术。为了缓解系统抖振问题,在滑模控制策略中整合了一种新型趋近律。仿真结果验证了滑模变结构控制在实现路感反馈功能上的优越性。
文摘We study electron transmission through two impurities in a narrow quantum wire by solving Dyson's equations for single electron Green functions. We have verified that, for the delta-function potential of two impurities, the Green function can be factorized into a product of the ‘free’ Green function and current transmission amplitude. Meanwhile Green function and current transmission amplitude obey Fisher-Lee's relation. An analytical expression of the electron transmission amplitude for intrasubband and intersubband is obtained as a function of Fermi energy and the distance between two impurities. The resonant behavior of the current transmission amplitude are detail discussed.
