An accurate and objective assessment of the health status of EMU trains is of great importance.In order to make sure the trains are functional,reliable,and endurable in their full life cycle(FLC),health assessment met...An accurate and objective assessment of the health status of EMU trains is of great importance.In order to make sure the trains are functional,reliable,and endurable in their full life cycle(FLC),health assessment method for EMU trains after Level 3-5 maintenance and repair is studied.First,the element-selection principles and the assessment rules are defined;second,to present the complex topological relationship between the elements in assessment,a functional logical structure construction method is proposed;third,a health value calculation model is defined based on the element’s characteristics and their logical structures.The health variables of each element is calculated and fitted following the steps in the corresponding weight calculation methods.The assessment method is proved to be applicable and effective.展开更多
In recent years,two-dimensional(2D)materials have attracted extensive interests due to the large exciton binding energy different from bulk materials.Many peculiar properties have been discovered that have farreaching...In recent years,two-dimensional(2D)materials have attracted extensive interests due to the large exciton binding energy different from bulk materials.Many peculiar properties have been discovered that have farreaching perspectives in the next generation of optoelectronic devices.In this review,we introduce the forms of exciton existence in 2D materials and several promising 2D materials with good applications at first.Then,we summarize relevant contemporary tools for probing exciton dynamics and methods of regulating 2D exciton transport,for instance,electrical regulation,stress/surface wave regulation and moirépotential regulation,etc.Finally,we conclude the general development of regulation in 2D materials and propose several possible opportunities of application prospect.展开更多
文摘An accurate and objective assessment of the health status of EMU trains is of great importance.In order to make sure the trains are functional,reliable,and endurable in their full life cycle(FLC),health assessment method for EMU trains after Level 3-5 maintenance and repair is studied.First,the element-selection principles and the assessment rules are defined;second,to present the complex topological relationship between the elements in assessment,a functional logical structure construction method is proposed;third,a health value calculation model is defined based on the element’s characteristics and their logical structures.The health variables of each element is calculated and fitted following the steps in the corresponding weight calculation methods.The assessment method is proved to be applicable and effective.
文摘In recent years,two-dimensional(2D)materials have attracted extensive interests due to the large exciton binding energy different from bulk materials.Many peculiar properties have been discovered that have farreaching perspectives in the next generation of optoelectronic devices.In this review,we introduce the forms of exciton existence in 2D materials and several promising 2D materials with good applications at first.Then,we summarize relevant contemporary tools for probing exciton dynamics and methods of regulating 2D exciton transport,for instance,electrical regulation,stress/surface wave regulation and moirépotential regulation,etc.Finally,we conclude the general development of regulation in 2D materials and propose several possible opportunities of application prospect.
