The reflecting and transmitting effects of a planar unidirectionally conducting screen are analyzed based on the accurate closed-form expression for electric field of an arbitrarily oriented electric dipole.For a dipo...The reflecting and transmitting effects of a planar unidirectionally conducting screen are analyzed based on the accurate closed-form expression for electric field of an arbitrarily oriented electric dipole.For a dipole oriented along the wire elements of the screen,the screen acts as a perfectly electrically conducting plane.For a dipole perpendicular to the wire elements,the fields reflected by the screen can be interpreted as the contribution of an image dipole and image transmission-line current source,while the transmitted field is arisen from image transmission-line source.The expressions of related surface waves are derived and can be compared with previous results.展开更多
Deformation texture plays an important influence on the mechanical properties and the anisotropy over Mo-La alloy products.In this work,Mo-La plates prepared by powder metallurgy process are unidirectionally rolled an...Deformation texture plays an important influence on the mechanical properties and the anisotropy over Mo-La alloy products.In this work,Mo-La plates prepared by powder metallurgy process are unidirectionally rolled and annealed at various temperatures.And the texture,microstructure,mechanical properties,anisotropy and the correlation of Mo-La plates for the rolled and annealed states at different temperatures are analyzed and discussed.The results show that unidirectionally rolled Mo-La plates form grain orientation dominated by{001}<110>and the texture types are not changed during annealing.With the increase of annealing temperatures,the orientation density of texture is increased first and then decreased,which is related to the movement of dislocations and the orientation of new nucleation grains is affected by the original rolled texture.The anisotropy of Mo-La plates is significantly weakened after being annealed,which is caused by the combined effects of the annealing texture,grain size,grain shape and dislocations.展开更多
Synchronization behavior of an ensemble of unidirectionally coupled neurons with a constant input is investigated. Chemical synapses are considered for coupling. Each neuron is also considered to be exposed to a self-...Synchronization behavior of an ensemble of unidirectionally coupled neurons with a constant input is investigated. Chemical synapses are considered for coupling. Each neuron is also considered to be exposed to a self-delayed feedback. The synchronization phenomenon is analyzed by the error dynamics of the response trajectories of the system. The effect of various model parameters e.g. coupling strength, feedback gain and time delay, on synchronization is also investigated and a measure of synchrony is computed in each cases. It is shown that the synchronization is not only achieved by increasing the coupling strength, the system also required to have a suitable feedback gain and time delay for synchrony. Robustness of the parameters for synchrony is verified for larger systems.展开更多
文摘The reflecting and transmitting effects of a planar unidirectionally conducting screen are analyzed based on the accurate closed-form expression for electric field of an arbitrarily oriented electric dipole.For a dipole oriented along the wire elements of the screen,the screen acts as a perfectly electrically conducting plane.For a dipole perpendicular to the wire elements,the fields reflected by the screen can be interpreted as the contribution of an image dipole and image transmission-line current source,while the transmitted field is arisen from image transmission-line source.The expressions of related surface waves are derived and can be compared with previous results.
基金This work was financially supported by the National Key R&D Program of China(Grant No.2017YFB0306001)the Innovation-Driven Project of Central South University(Grant No.502221802).
文摘Deformation texture plays an important influence on the mechanical properties and the anisotropy over Mo-La alloy products.In this work,Mo-La plates prepared by powder metallurgy process are unidirectionally rolled and annealed at various temperatures.And the texture,microstructure,mechanical properties,anisotropy and the correlation of Mo-La plates for the rolled and annealed states at different temperatures are analyzed and discussed.The results show that unidirectionally rolled Mo-La plates form grain orientation dominated by{001}<110>and the texture types are not changed during annealing.With the increase of annealing temperatures,the orientation density of texture is increased first and then decreased,which is related to the movement of dislocations and the orientation of new nucleation grains is affected by the original rolled texture.The anisotropy of Mo-La plates is significantly weakened after being annealed,which is caused by the combined effects of the annealing texture,grain size,grain shape and dislocations.
文摘Synchronization behavior of an ensemble of unidirectionally coupled neurons with a constant input is investigated. Chemical synapses are considered for coupling. Each neuron is also considered to be exposed to a self-delayed feedback. The synchronization phenomenon is analyzed by the error dynamics of the response trajectories of the system. The effect of various model parameters e.g. coupling strength, feedback gain and time delay, on synchronization is also investigated and a measure of synchrony is computed in each cases. It is shown that the synchronization is not only achieved by increasing the coupling strength, the system also required to have a suitable feedback gain and time delay for synchrony. Robustness of the parameters for synchrony is verified for larger systems.
