In this paper is given an evaluation formula for a kind of infinite integrals by applying parametric variable integrals.
本文应用含参变量积分的方法，给出了一类无穷积分的求值公式。
It is given a evaluation formula for a class of infinite integrals by applying Parametric Variable integral transformation.
应用含参变量积分变换的方法，给出了一类无穷积分的求值公式。
The regulating rule for parametric variable PID which is successfully applied to the computer excitative regulator is studied and analyzed by means of computer emulation.
采用计算机仿真的办法，研究和解析了变参数PID调节规律在微机励磁调节器上的应用。
When a inverse function of monotone function can not show the explicit formula, the distribution density curve of continuous randon variable can be gained with a parametric equation.
当单调函数的反函数不能显性表示时，连续型随机变量的分布密度曲线仍可通过参数方程的形式获得。
Parametric design and variable technology are applied to reduce duplication and improve efficiency.
参数化、变量化技术的应用可以减少重复工作，提高工作效率。
There is more practical significance for the research of geometric constraint solving, which is the core of parametric technology and variable technology.
该算法使得作为参数化技术和变量化技术的核心问题：几何约束求解的研究更具有实际意义。
A variable length simple pendulum model is introduced, elementary analysis and perturbation analytic solution of nonlinear differential equation for parametric resonance are presented.
采用可变长度单摆的力学模型对秋千振荡给出初等分析，采用微扰近似法导出了秋千的非线性参数共振解析解， 并进行了讨论。
A variable length simple pendulum model is introduced, elementary analysis and perturbation analytic solution of nonlinear differential equation for parametric resonance are presented.
采用可变长度单摆的力学模型对秋千振荡给出初等分析，采用微扰近似法导出了秋千的非线性参数共振解析解， 并进行了讨论。
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