Field of the Current Pulse Moving Along the Straight Line with Super Light Velocity

Distributional and regularized radiation fields of non-uniformly moving straight dislocations, and elastodynamic Tamm problem

This work introduces original explicit solutions for the elastic fields radiated by non-uniformly moving, straight, screw or edge dislocations in an isotropic medium, in the form of time-integral representations in which acceleration-dependent contributions are explicitly separated out. These solutions are obtained by applying an isotropic regularization procedure to distributional expressions of the elastodynamic fields built on the Green tensor of the Navier equation. The obtained regularized field expressions are singularity-free, and depend on the dislocation density rather than on the pla…

沿尖点运动的均匀加速点电荷

On a Uniformly Accelerated Point Charge moving along a Cusp

本文研究了沿尖点运动的均匀加速点电荷，求得了其Larmor辐射的角分布、恒定功率及最大方向强度，发现其辐射强度标度类似于非均匀加速同步辐射，并确认了量子化场探测器的精确真空激发谱。

Field of a moving locked charge in classical electrodynamics

The paradox of a field of a moving locked charge (confined in a closed space) is considered and solved with the use of the integral Maxwell equations. While known formulas obtained for instantaneous fields of charges moving along straight and curved lines are fully correct, measurable quantities are average electric and magnetic fields of locked charges. It is shown that the average electric field of locked charges does not depend on their motion. The average electric field of protons moving in nuclei coincides with that of protons being at rest and having the same spatial distribution of the …

Uniformly-moving non-singular dislocations with elliptical core shape in anisotropic media

To allow for `relativistic'-like core contraction effects, an anisotropic regularization of steadily-moving straight dislocations of arbitrary orientation is introduced, with two scale parameters $a_\parallel$ and $a_\perp$ along the direction of motion and transverse to it, respectively. The dislocation core shape is an ellipse. When $a_\perp/a_\parallel\to 0$, the model reduces to the Peierls-Eshelby dislocation, the fields of which are non-differentiable on the slip plane. For finite $a_\parallel$ and $a_\perp$, fields are everywhere differentiable. Applying the author's so-called `causal' …

关于带电粒子在磁场中运动的的作用量

On the action for a charged particle moving in a magnetic field

本文利用莫佩尔蒂最小作用量原理，为均匀磁场中带电粒子推导出含磁通量项的作用量，从而无需拉格朗日方法即可应用玻尔-威尔逊-索末菲量子化条件，并直接给出一般电磁场中的正则动量与拉格朗日量。

Experiments on the generation of long wavelength edge radiation along directions nearly coincident with the axis of a straight section of the "Pakhra" synchrotron

Generation of long wavelength edge radiation along directions nearly coincident with the axes of straight sections of storage rings and synchrotrons is discussed. The removal of destructive interference from the superimposed edge radiation patterns of a straight section on the synchrotron "Pakhra" has been observed experimentally.