the expressions of external and internal coupling were derived from the reciprocity theorem by analysing slot voltage distribution in this paper, which invoked magnetic current to slots.
an extension of the reciprocity theorem in elasticity is made to be applicable to the static, self-gravitational elastic earth.
本文将弹性力学甲的能量互换定理作了推广,得到了对静态、具自重的弹性地球体适用的互换定理。
reciprocity theorem and small apertures equivalent method are used to analyze the coupling problem between circular groove waveguides, a formula of the apertures equivalent reactance is obtained;