Numerical computation of steady natural cavitating flow based on transport equation cavitaion model;

Novel formulas to analyze the gain characteristics of Er3+/Yb3+ co-doped waveguide amplifiers(EYCDWA)are derived from the rate equations and the light propagation equations under the uniform dopant and steady-state conditions,neglecting the amplified spontaneous emission and introducing initial energy transfer efficiency.

With the help of rate equations and the propagation equation of Er 3+/Yb 3+-codoped phosphate fiber, we analyzed the effects of concentration of erbium and ytterbium ions, pump power, signal power and fiber length on the gain characteristics of the co-doped fiber amplifier.

Based on the rate equations and light propagation equations of homogeneously broadened four-level system, the numerical simulations for tellurite-based optical fiber amplifiers (EDTFA) are presented in the paper.

In the paper,the importance of the beam propagation equation in ISO standard draft is discussed,and a verifying method is given.

This paper presents deeply the peculiar problem of protection for the double-circuit overhead lines on same towers at first,then proposes the fault location methods for these lines:1) By using the positive and negative sequence components of voltage and current synchronously sampled at both terminals,a fault locating method for any fault types can be got from uniform transmission line equations.

By using the positive sequence component of voltage and current synchronously sampled at both terminals,the positive-sequence voltage of fault point can be deduced from both terminal based on uniform transmission line equations,then the fault location equation can be got.