original equation

The equation for total pressure head of pre-and post cutting blades was deduced by integration method when we know the performance parameters and the twisting law of original fan.

在已知原有风机的特性参数及扭曲规律的情况下，本文通过积分法推导出切割前后的风机全压间的关系式，从而可以根据所需的全压大小找到合适的切割量。

For obtaining exact solution for the impulse response or step response, the preferred method is to solve the original differential equation on a digital or analog computer.

要获得脉冲反应或阶跃反应的精确解，最好的办法是用数字或模拟计算机求解原始微分方程。

With the use of diffraction principle and VSP diffraction time-distance equation, VSP diffraction migration method converges diffraction energy distributed on VSP traces to corresponding original location.

VSP绕射偏移是运用绕射原理，通过VSP绕射时距方程，把分布在VSP记录道上的绕射能量收敛到原始空间位置。

With the experimental values of thermal pressure coefficients of liquids to modify the excluded volume in the original van der Waals equation, an augmented van der Waals compressibility factor applicable to high density fluids is obtained.

利用实验测得的液体的热压力系数，修正原始van der waals模型中的排斥体积，得到了一个适用于高密度流体的推广的van der waals压缩因子。

The current research is very active and constantly expanding. Its main idea is to find approximate solutions with differential equations containing small parameter which is from some of the original equation by solving the simple equation, so it is called the approximate analytic solution.

它的主要任务是求含有小参数微分方程的近似解，而这个近似解是通过解一些与原方程有关的较简单方程中得到的，因此被称为解析近似解。

According to the original definition of titration error and titration curve equation, a general model for titration error has been built up.

本文从滴定误差直接定义出发，结合滴定曲线方程，建立滴定误差统一模型。