The paper considers the issues of calculating an electromagnetic vibrator designed to drive working bodies with reciprocating motion. purpose this work is refine mathematical model vibrators and, on basis, propose most rational parameters their design and modes use. Based initial magnetic system alternating current electromagnet, inductance inductive resistance electromagnet winding are determi...

A near-source electromagnetic method known as the short-offset transient (SOTEM) was proposed. Compared with traditional far-source methods, offset of SOTEM is greatly reduced, to only 0.3~2 times maximum depth. Therefore, can obtain signal higher signal-to-noise ratio and sensitivity. Application in Xiaoshan Mine Henan Province showed that an effective for deep ore exploration, especially moun...

We present the mathematical foundation for a point-source method to solve some inverse acoustic and electromagnetic obstacle scattering problems in three dimensions. We investigate the inverse acoustic scattering problem by a sound-soft and a sound-hard scatterer and the inverse electromagnetic scattering problem by a perfect conductor. Two independent approaches to the method are presented whi...

We propose a method to control electromagnetic flux in an almost arbitrary way in wavelength and subwavelength scales. The capability of subwavelength flux control is enabled by the evanescent waves induced in a class of inhomogeneous anisotropic media with a near-zero permittivity component. By designing the spatial profile of the other permittivity component in such inhomogeneous media, the f...

This paper presents the rationale for the use of method of moments for evaluation of electromagnetic field scattered by dielectric random fractal surfaces. Derivation of the algorithm is given along with a reliable fractal profile generation procedure. Choice of key parameters pertinent to method of moments is also discussed. Numerical results are finally used to investigate the behaviour of th...