1) double transformation
双变换
1.
In this paper, a kind of linear differential equation with variable coefficients is turned into second order linear differential equation with constant coefficients through double transformation——linear and self-variable transformation of unknown function, then a new soluable, type of second order linear differential equation with variable coefficients is obtained.
通过双变换——未知函数的线性变换和自变量变换 ,将一类变系数线性微分方程化为二阶常系数线性微分方程 ,从而得到变系数二阶线性微分方程的一个新的可解类型 ,推广了著名的二阶 Euler方程 。
2.
By means of double transformation (linear transformation of unknown function and self-variable transformation), several classes of l.
借助双变换 -未知函数的线性变换和自变量的变换 ,将几类变系数线性微分方程化为常系数的线性微分方程 ,从而求得它们的通解 ,所得结论推广了著名的Euler方程及前人的一些的工
3.
Based on some kind of ultra functional integral formula and by the use of the double transformation,this paper attains the integral formula of three kinds of nonlinear differential equations and gives the reduction of integral to a common denominator of these equations.
借助某类超越函数的积分公式，利用双变换，获得三类非线性常微分方程的可积定理，并给出了这几类方程的通积分的表达式，所得结论是相应文献结果的深化与拓广。
2) double conversion
双变换
1.
double conversion UPS, line interactive UPS, passive standby UPS, and many kinds of redundant UPS.
本文根据新的国际标准IEC 62040-3的规定,介绍了双变换UPS、市电交互UPS、冷备用UPS 等三种标准单机UPS系统和各种冗余UPS系统,阐述了UPS按性能分类的新方法。
3) Double dq transformation
双dq变换
1.
To solve the worse harmonic wave problem in electric grid brought by power electric non-linear current transformation equipment and large capacity dynamic load,the structural characteristic,operational principle and the method of double dq transformation on the series hybrid active power filter with fundamental current bypass channel which can inhibit the wave in harmony effectively are analyzed.
为了解决电力电子等非线性变流装置和大容量动态负载所带来的电网日益严重的谐波问题,本文分析了能有效抑制谐波的带基波电流旁路通道的串联混合有源电力滤波器的结构特点、工作原理及双dq变换控制方法,提出基于FPGA的脉宽调制PWM硬件实现方法,设计了混合有源电力滤波器数字控制电路结构。
4) hyperbolic transformation
双曲变换
1.
A method to calculate the hyperbolic transformations for triangularizing a given matrix, including the testing of its existence condition, is proposed.
引入非定矩阵的广义平方根分解,给出了使矩阵三角化的双曲变换矩阵的存在性判别及其求取方法,从而使H∞滤波的存在性判别以及H∞广义平方根滤波的算法得以实现。
5) dual variation method
双变换法
1.
By means of dual variation method and deviation method,this paper gives one kind of four order nonlinear differential equation and sufficient conditions for some kind of solutions.
借助双变换法及求导法则,给出一类四阶非线性微分方程,具有某种形式的解的充要条件,所得结论是对有关文献结果的深化与推广。
6) Dual-Buck converter
双Buck变换
补充资料：Radon变换和逆Radon变换
Radon变换和逆Radon变换
X线物理学术语。CT重建图像成像的主要理论依据之一。1917年澳大利亚数学家Radon首先论证了通过物体某一平面的投影重建物体该平面两维空间分布的公式。他的公式要求获得沿该平面所有可能的直线的全部投影(无限集合)。所获得的投影集称为Radon变换。由Radon变换进行重建图像的操作则称为逆Radon变换。Radon变换和逆Radon变换对CT成像的意义在于，它从数学原理上证实了通过物体某一断层层面“沿直线衰减分布的投影”重建该层面单位体积，即体素的线性衰减系数两维空间分布的可能性。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条