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.
以多电子原子精细结构哈密顿的球张量形式和不可约张量理论为基础,建立了计算多电子原子精细结构(包括自旋-轨道相互作用、自旋-其它轨道相互作用和自旋-自旋相互作用)能量的一般性解析理论形式,应用所建立的理论对类碳体系( Z=6 ～8)基态的精细结构能量进行了具体计算,计算结果与实验数据符合得较好。
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.
本文提出了多电子原子及离子体系Ｈａｍｉｌｔｏｎ算符中势函数的新表达式，并由此从Ｓｃｈｒｏｄｉｎｇｅｒ方程出发导出了文献［１０］计算电离势的公式。
Harmonics analysis and simulation research of multi-cell-cascade multi-level inverter;
级联型多电平逆变器的谐波分析及仿真研究
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.
本文对DC-DC变换器中的主要技术——软开关、同步整流、移相PWM技术和多电平技术的发展与现状进行了综述,并讨论了变换器未来的发展趋势。
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.
在级联式拓扑结构的基础上,提出了一种非对称多电平逆变器,该逆变器的每个单元采用将1个二电平逆变器和几个三电平H桥串联组成,控制系统由DSP和FPGA组成。