DIFFRACTION RADIATION OF PARTICLE PASSING BY IMPEDANCE WEDGE

The diffraction radiation field generated by the charged particle passing by the perfectly conductive or impedance wedge is considered. With perfect conductivity, the wedge rotation around the edge fixed along with the straight particle motion line, does not change the total radiated energy. When the motion to the edge is almost parallel to a face of wedge then an increase of impedance from zero increases the radiated energy.

RADIATION OF CHARGE PASSING BY IMPEDANCE WEDGE

The diffraction radiation generated by a charge passing by a plasma wedge is considered in impedance approximation. In the perfect conductivity limit, the total radiated energy is not varying with the wedge rotation around the edge fixed along with the charge motion line. The impedance increase may lead to the total radiated energy increase, due to effective surface wave generation, when the charge motion to the edge is almost parallel to a face of wedge.

Asymptotic analysis for the electric field concentration with geometry of the core-shell structure

<p style='text-indent:20px;'>In the perfect conductivity problem arising from composites, the electric field may become arbitrarily large as <inline-formula><tex-math id="M1">\begin{document}$ \varepsilon $\end{document}</tex-math></inline-formula>, the distance between the inclusions and the matrix boundary, tends to zero. In this paper, by making clear the singular role of the blow-up factor <inline-formula><tex-math id="M2">\begin{document}$ Q[\varphi] $\end{document}</tex-math></inline-formula> introduced in [<xref ref-type="bibr" rid="b27">27</xref>] for some special boundary data of even function type with <inline-formula><tex-math id="M3">\begin{document}$ k $\end{document}</tex-math></inline-formula>-order growth, we prove the optimality of the blow-up rate in the presence of <inline-formula><tex-math id="M4">\begin{document}$ m $\end{document}</tex-math></inline-formula>-convex inclusions close to touching the matrix boundary in all dimensions. Finally, we give closer analysis in terms of the singular behavior of the concentrated field for eccentric and concentric core-shell geometries with circular and spherical boundaries from the practical application angle.</p>

Modeling and Simulation of a Superconductive Linear Motor

Recent work and advances have showed great development in the field of linear motors, one being the integration of superconductors with the design and implementation of linear motors. In this approach, instead of using the traditional metallic conductors for the motor stator and rotor (to create the electromagnetic core), it was proposed, that the use of superconductor wires would yield greater and more efficient motors. One of the advantages of having perfect conductivity is stronger and more consistent magnetic field for the motor, allowing by that greater transitional speeds. However, until now, there have been no reported designs that could be used in real-world applications. This work is based on an existing design. However, we create a design model of functional linear induction motor using high temperature superconductor wires for the magnetic core. Moreover, a comparison is made between the actual performance specifications (core current, magnetic flux, and magnetic force), with those obtained from experimental simulation methods (using ANSYS Electromagnetic suit or COMSOL Multiphysics software packages). The design model is tested to verify the simulation results, and its suitability for engineering applications.

Photon-Assisted Perfect Conductivity Between Arrays of Two-Level Atoms

We investigate interactions between two (parallel) arrays of two-level atoms (2LA) via photons through quantum electrodynamical interaction with one array (the source array) connected to a particle source, and we study the (photo-)resistivity of the other array (the measured array). The wave function of the interacted photon propagating in an array is a Bloch wave with a gap in its eigenvalue (the photonic dispersion). Due to interactions between arrayed 2LA and the dressed photonic field with non-linear dispersion, the conduction behaviors of the measured array can be very diversified according to the input energy of the particle source connected to the source array, and their relative positions. As a result, the resistivity of the measured array can be zero or negative, and can also be oscillatory with respect to the incoming energy of the particle source of the source array, and the separation between arrays.