The key to revealing the behaviors of magnetoelastic interaction is how to express the magnetic forces applying on a ferromagnetic elastic body. In this paper, a functional for a ferromagnetic thin plate in magnetic f...The key to revealing the behaviors of magnetoelastic interaction is how to express the magnetic forces applying on a ferromagnetic elastic body. In this paper, a functional for a ferromagnetic thin plate in magnetic fields is proposed by taking the summation of the magnetic energy of the magnetic system and the strain energy of the elastic plates. We present a variational principle for the problem by choosing the variations of magnetic potential and deflection as independent variates each other. Based on the principle, not only are the simultaneous governing equations for magnetic fields and deformation of structures deduced, but also a general expression of magnetic force acting on the plates is gained, which makes it possible to commonly simulate the distinct two experiments of magnetoelastic interaction in a theoretical model. Thus, it can be used to theoretical prediction of the magnetoelastic interaction of ferromagnetic plates in a complex environment of applied magnetic fields.展开更多
A transferable tight-binding potential for Ni has been developed. Molecular dynamics methods and simulated annealing techniques have been used to study the structural properties of Ni clusters with this potential. We ...A transferable tight-binding potential for Ni has been developed. Molecular dynamics methods and simulated annealing techniques have been used to study the structural properties of Ni clusters with this potential. We have obtained the structures of some Ni clusters. The average coordination number, ionization potentials and the stability of clusters have also been calculated.展开更多
Melt flow has an important influence on the microstructure formation of alloys. In this paper the growth behaviour of constrained crystals is systematically studied. It is discovered that the constrained crystals have...Melt flow has an important influence on the microstructure formation of alloys. In this paper the growth behaviour of constrained crystals is systematically studied. It is discovered that the constrained crystals have a quite complicated response to melt flow. It may grow upstream or downstream or keep its growth direction unchanged with the influence of melt flow. Also low growth velocity and high flow velocity favour the formation of spike-like crystal. A new model is suggested to explain these experimental results.展开更多
THE motion of earth’s instantaneous rotation pole with respect to the earth crust or the mean pole of the epoch is briefly referred to as the polar motion.The polar motion is mainly charac-terized by the annual and C...THE motion of earth’s instantaneous rotation pole with respect to the earth crust or the mean pole of the epoch is briefly referred to as the polar motion.The polar motion is mainly charac-terized by the annual and Chandler polar motion.With data accumulation and promotion ofthe observation accuracy after the 1980s,people have extended researches of only annual展开更多
文摘The key to revealing the behaviors of magnetoelastic interaction is how to express the magnetic forces applying on a ferromagnetic elastic body. In this paper, a functional for a ferromagnetic thin plate in magnetic fields is proposed by taking the summation of the magnetic energy of the magnetic system and the strain energy of the elastic plates. We present a variational principle for the problem by choosing the variations of magnetic potential and deflection as independent variates each other. Based on the principle, not only are the simultaneous governing equations for magnetic fields and deformation of structures deduced, but also a general expression of magnetic force acting on the plates is gained, which makes it possible to commonly simulate the distinct two experiments of magnetoelastic interaction in a theoretical model. Thus, it can be used to theoretical prediction of the magnetoelastic interaction of ferromagnetic plates in a complex environment of applied magnetic fields.
文摘A transferable tight-binding potential for Ni has been developed. Molecular dynamics methods and simulated annealing techniques have been used to study the structural properties of Ni clusters with this potential. We have obtained the structures of some Ni clusters. The average coordination number, ionization potentials and the stability of clusters have also been calculated.
文摘Melt flow has an important influence on the microstructure formation of alloys. In this paper the growth behaviour of constrained crystals is systematically studied. It is discovered that the constrained crystals have a quite complicated response to melt flow. It may grow upstream or downstream or keep its growth direction unchanged with the influence of melt flow. Also low growth velocity and high flow velocity favour the formation of spike-like crystal. A new model is suggested to explain these experimental results.
文摘THE motion of earth’s instantaneous rotation pole with respect to the earth crust or the mean pole of the epoch is briefly referred to as the polar motion.The polar motion is mainly charac-terized by the annual and Chandler polar motion.With data accumulation and promotion ofthe observation accuracy after the 1980s,people have extended researches of only annual
