Based on the tensor expression of the fine-structure Hamiltonian for many-electron atoms,and with the help of irreducible tensor theory,a general analytical theory of calculating the fine structure energy(including spin-orbit interaction,spin-other-orbit interaction and the spin-spin interaction) of many-electron atoms has been established explicitly.

A new expression is put forward for the potential function in the Hamilton operator of multiple electron atomic and ionic systems,and the ionization potential formula in Ref.

Harmonics analysis and simulation research of multi-cell-cascade multi-level inverter;

This paper reviews the main techniques of DC-DC converters,which are soft switching technique,synchronous rec- tification,shift-phase PWM and multi-level technique.

One asymmetrical multi-level inverter is proposed based on the topology of cell cascade,every cell in this in-verter is composed of one two-levels inverter in series with several three-levels H bridges,the controlling system is con-structed by DSP and FPGA.