1) The two stream approximation
二流近似
2) quadratic approximation
二次近似
1.
Based on the quadratic approximation of the stability region boundary,this paper proposes a transient voltage stability margin index,and analyzes the transient voltage stability of a one-machine and one-load system including an electromechanical transient model of induction motor.
基于稳定域边界二次近似,提出了暂态电压稳定裕度指标,并分析了计及感应电动机机电暂态过程的单负荷无穷大系统的暂态电压稳定性。
2.
This paper presents a new transient stability index based on the implicit expression for the stability region boundary and an approximation of the proposed index based on the quadratic approximation of the stability region.
基于故障后电力系统稳定域边界的隐式方程,提出了隐式的暂态稳定指标,并利用稳定域的二次近似方法给出了该暂态稳定指标的一个近似估计。
3.
The CCT is determined by the crossing point of the quadratic approximation surface and the continuous faulted trajectory.
基于故障后电力系统稳定域边界的二次近似来估计临界切除时间。
3) More exact
二级近似
1.
The more exact object image refraction image on axial spherical surface is presented, thereafter the lateral magnification and aberration are discussed.
给出了二级近似时近轴球面折射成象的物理规律 ,进而讨论了横向放大率与象
4) second order approximation
二阶近似
1.
Through constructing a general equilibrium pricing model,we look for the stochastic discount factor and price the European option by second order approximation.
在此基础上,采用二阶近似方法对欧式期权进行定价。
5) double-approximation
二重近似
6) fluid approximation
流近似
补充资料：二流
【二流】
（名数）一、顺流，流即生死之流，六道之众生，起惑造业，顺生死之流，而背涅槃之道，即流转之因果也。二、逆流，由初果须陀洹，断已后三界之惑，渐逆生死之流，而趣涅槃之道，即还灭之因果也。见涅槃经三十六。
（名数）一、顺流，流即生死之流，六道之众生，起惑造业，顺生死之流，而背涅槃之道，即流转之因果也。二、逆流，由初果须陀洹，断已后三界之惑，渐逆生死之流，而趣涅槃之道，即还灭之因果也。见涅槃经三十六。
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参考词条