An Autler-Townes（AT） spectroscopy based on phase conjugate six-wave mixing（SWM） is proposed to detect AT doublet of high-lying state in a Doppler-broadened cascade four-level system.It is found that the SWM spectr...An Autler-Townes（AT） spectroscopy based on phase conjugate six-wave mixing（SWM） is proposed to detect AT doublet of high-lying state in a Doppler-broadened cascade four-level system.It is found that the SWM spectrum is dependent strongly on the ratios between the magnitudes of the wave vectors.We discuss how the Doppler broadening affects the SWM spectrum from a time-domain viewpoint and find that,due the atomic motion,the atomic polarizations acquire different phases for atoms with different velocities as time evolves.The Doppler free SWM spectrum can be obtained only when the atomic polarization can be rephasing again at certain time after the interactions of all the incident fields.展开更多
A kinetic flux-vector splitting (KFVS) scheme is applied for solving a reduced six-equation two-phase flow model of Saurel et al. [1]. The model incorporates single velocity, two pressures and relaxation terms. An add...A kinetic flux-vector splitting (KFVS) scheme is applied for solving a reduced six-equation two-phase flow model of Saurel et al. [1]. The model incorporates single velocity, two pressures and relaxation terms. An additional seventh equation, describing the total mixture energy, is added to the model to guarantee the correct treatment of shocks in the single phase limit. Some salient features of the model are that it is hyperbolic with only three wave propagation speeds and the volume fraction remains positive. The proposed numerical scheme is based on the direct splitting of macroscopic flux functions of the system of equations. The second order accuracy of the scheme is achieved by using MUSCL-type initial reconstruction and Runge-Kutta time stepping method. Moreover, a pressure relaxation procedure is used to fulfill the interface conditions. For validation, the results of suggested scheme are compared with those from the high resolution central upwind and HLLC schemes. The central upwind scheme is also applied for the first time to this model. The accuracy, efficiency and simplicity of the KFVS scheme demonstrate its potential for modeling two-phase flows.展开更多
针对带电更换特高压直线塔绝缘子串六线提线钩重量大,导致作业人员劳动强度大、危险系数高、工作效率低的问题,通过结构优化、碳纤维预浸料铺层工艺设计以及固化工艺探索,设计研制碳纤维六线提线钩。通过力学仿真对提线钩上主体和副钩...针对带电更换特高压直线塔绝缘子串六线提线钩重量大,导致作业人员劳动强度大、危险系数高、工作效率低的问题,通过结构优化、碳纤维预浸料铺层工艺设计以及固化工艺探索,设计研制碳纤维六线提线钩。通过力学仿真对提线钩上主体和副钩分别进行受力特性分析,计算发现提线钩上主体受力薄弱部位位于顶端螺栓连接孔处,当施加3倍额定荷载(240 k N)时,最大变形位移为0.51 mm,最大应力为1.9×10~8 Pa;副钩受力薄弱部位位于副钩螺栓连接处,当施加3倍额定荷载(40 k N)时,最大位移为0.91 mm,最大应力为1.7×10~8 Pa。经力学试验测试,该提线钩最大破坏力为260 k N,满足240 k N的设计要求。碳纤维六线提线钩的成功研制,为碳纤维复合材料在特高压带电作业中的应用奠定基础。展开更多
基金Project supported by the National Basic Research Program of China(Grant No.2013CB922002)the National Natural Science Foundation of China(Grant Nos.11274376 and 61308011)the National High Technology Research and Development Program of China(Grant No.2011AA120102)
文摘An Autler-Townes（AT） spectroscopy based on phase conjugate six-wave mixing（SWM） is proposed to detect AT doublet of high-lying state in a Doppler-broadened cascade four-level system.It is found that the SWM spectrum is dependent strongly on the ratios between the magnitudes of the wave vectors.We discuss how the Doppler broadening affects the SWM spectrum from a time-domain viewpoint and find that,due the atomic motion,the atomic polarizations acquire different phases for atoms with different velocities as time evolves.The Doppler free SWM spectrum can be obtained only when the atomic polarization can be rephasing again at certain time after the interactions of all the incident fields.
文摘A kinetic flux-vector splitting (KFVS) scheme is applied for solving a reduced six-equation two-phase flow model of Saurel et al. [1]. The model incorporates single velocity, two pressures and relaxation terms. An additional seventh equation, describing the total mixture energy, is added to the model to guarantee the correct treatment of shocks in the single phase limit. Some salient features of the model are that it is hyperbolic with only three wave propagation speeds and the volume fraction remains positive. The proposed numerical scheme is based on the direct splitting of macroscopic flux functions of the system of equations. The second order accuracy of the scheme is achieved by using MUSCL-type initial reconstruction and Runge-Kutta time stepping method. Moreover, a pressure relaxation procedure is used to fulfill the interface conditions. For validation, the results of suggested scheme are compared with those from the high resolution central upwind and HLLC schemes. The central upwind scheme is also applied for the first time to this model. The accuracy, efficiency and simplicity of the KFVS scheme demonstrate its potential for modeling two-phase flows.
基金Supported by The National Natural Science Foundation of China(No.60807014)the Natural Science Foundation of Jiangxi Province,China(No.2009GZW0005)the Research Foundation of State Key Laboratory of Advanced Optical Communication Systems and Networks,and the Research Foundation of the Education Depart ment of Jiangxi Province,China(No.GJJ09153)
文摘针对带电更换特高压直线塔绝缘子串六线提线钩重量大,导致作业人员劳动强度大、危险系数高、工作效率低的问题,通过结构优化、碳纤维预浸料铺层工艺设计以及固化工艺探索,设计研制碳纤维六线提线钩。通过力学仿真对提线钩上主体和副钩分别进行受力特性分析,计算发现提线钩上主体受力薄弱部位位于顶端螺栓连接孔处,当施加3倍额定荷载(240 k N)时,最大变形位移为0.51 mm,最大应力为1.9×10~8 Pa;副钩受力薄弱部位位于副钩螺栓连接处,当施加3倍额定荷载(40 k N)时,最大位移为0.91 mm,最大应力为1.7×10~8 Pa。经力学试验测试,该提线钩最大破坏力为260 k N,满足240 k N的设计要求。碳纤维六线提线钩的成功研制,为碳纤维复合材料在特高压带电作业中的应用奠定基础。
基金National Natural Science Foundation of China(1086407)Xinjiang Normal University Graduate Student Innovation Fund Projects of China(20121215)the Key Discipline of Theoretical Physics Graduate Innovation Fund of Xinjiang, China(LLWLY201111)
