In this paper, the hybrid method of aperture-integration and surface-integration technique with three dimension ray tracking technique is presented.

By the surface aperture integration of the equivalent source on inner surface, the secondly-incidental fields upon the radome are obtained, then the secondly-incidental wave transfer through local plane of multi-layer dielectr.

In this paper, complex ray theory and geometric optics as well as integrating the aperture field are presented for calculating the interior radar cross section(RCS) from and openended cavity with rectangular cross section.

The aperture integration-surface integration(AI-SI) method is a common numerical simulation method for the far-fields of the antenna-radome system.

By combining it with the surface integration(SI) technique,the aperture integration /spectrum area integration-surface integration(AI/SAI-SI) method is presented,to simulate the electromagnetic performance of three-dimension antenna-radome system.

Using the canonical transformation and the method of path integrals, the quantum wavefunction of the time-dependent RLC circuit after quantization is solved, and the quantum fluctuations of the charge and current are investigated.

The mathematical structure and physical sense of Feynman s path integrals have been redefined,by using the theory of stochastic processes.

Using the canonical transformation and the method of path integrals,the exact wavefunction of the time dependent damped harmonic oscillator is derived.