参数方程

By making use of the definition of derivative ,one can calculate the derivative of demarcation point ,the derioative of the special elementary function,the derivative of parametric equation.

利用导数的定义可求分界点的导数，特殊初等函数的导数和某些参数方程的导

1The shape of seed curved face and the parametric equation of the peak pointangle of the seed surface are put forward.

对内侧充种垂直圆盘排种器工作时，排种器内腔中种子面的形状进行了分析，提出种子面最高点位置角的参数方程。

The macroprogram is written by using the elliptical parametric equation, then some actual work problem can be solved with the macroprogram.

在数控编程的实际应用中，常见的是直线插补和圆弧插补，没有椭圆插补，但在实际生产中，往往遇到许多椭圆的零件需要加工，如果手工常规编程就无法编制出椭圆的加工程序，为了解决这个问题，在数控编程中有宏程序可以做到椭圆的加工，本文按HCNC-21T系统（在其他系统只不过是宏程序的格式不同而已）对椭圆做内、外的加工编程举例，还在内椭圆的加工中先加工一个工艺孔，巧妙利用椭圆的参数方程来编写宏程序，用宏程序来解决一些实际的工作问题。

This paper introduced some application of Mathematica in drawing geometrical graphics,gave a common method to get the parametric function of surface of revolution in three-dimensional space,and the Mathematica programs of several examples about the surfaces were given.

介绍了Mathematica在几种几何图形绘制中的应用，提出了获得空间旋转曲面的参数方程的一般方法，并给出了用Mathematica绘制空间旋转曲面的实例的源代码。

Aiming at the problem that solution FEMequation set needs too much memory, segregated solotion methOd has beenadopted and for the first in China E l em ent- B y- E lement has been introduc edwhen solving flow field parameter equation sets. EBE technology need notassemble and store the global stiffness matrix, and minish effectively memoryrequires of solution equation set, moreover it has inherent high parallelity, andadvance equation solution.

针对求解流场有限元方程组占用计算机内存资源过多、限制求解规模的缺点，采用分离式求解法，在求解流场各参数方程时，在国内首次引入EBE技术，EBE技术不必组集和存储总刚矩阵，能有效地减小了方程组求解时对内存空间的要求，同时EBE技术具有内在的高度并行性，能有效提高方程组的求解速度。

You would also need knowledge of the following parametric equations for the Bezier spline.

你也将需要下面的贝塞尔曲线的参数方程的知识。

Theory; the spatial meshing theory includes comparative motion, comparative differential and conjugative curved surface; and the application of meshing theory includes gear drive and worm drive. The spatial meshing theory is the main part of the course.

课程的重点讲解内容有曲线的参数方程、切线、法面、弧长、曲率、空间曲线的基本公式、挠率及平面曲线的基本公式等；曲面第一和第二基本公式，法曲率、主方向和主曲率、欧拉公式、短程挠率、欧拉公式和贝特朗公式推广、相对法曲率和相对短程挠率等；刚体的绝对和相对运动速度、相对微分和绝对微分、相对速度和相对微分、轨迹曲面的法曲率和短程挠率等；空间共轭曲面的啮合条件、诱导法曲率、两类界限点、等距共轭曲面、空间啮合的二次接触原理等；蜗杆传动的数学模型建立及啮合特性分析方法等。

Mathematical model of the cavity of three-tipped cycloidal pump was established, and the structure and characteristics of the novel three-tipped cycloidal pump were analyzed.

论述了三尖摆线的形成及其参数方程，并付其特性进行了研究，建立了三尖摆线泵型腔的数学模型，分析了新型三尖摆线泵的结构和特性。

And selects parabola y=ax2+b (X,+3S supposes 100 points, X,+S supposes 60 points) as the formulation score parametric equation, and determines various indexs evaluation criteria of physical quality in primary selection of eurythmic gymnastics in our country.

并选取抛物线y=ax2+b（X，+3S设为100分，X，+S设为60分）为制定分数的参数方程，并在此基础上确定身体素质各指标的评价标准。

And selects separately parabola y=ax2+b (X,+2S supposes 100 points, X,+S supposes 60 points), y=a2+b (X,supposes 100 points, X,±3S supposes 60 points) and y=ax2+b (X,+3S supposes 100 points, X,+S supposes 60 points) as the formulation score parametric equation, and determines various indexs evaluation criteria of the bodily shape in primary selection of eurythmic gymnastics in our country.

并分别选取抛物线y=ax2+b（X，+2S设为100分，X，+S设为60分）、y=a2+b（X，设为100分，X，±3S设为60分）和y=ax2+b（X，+3S设为100分，X，+S设为60分）为制定分数的参数方程，并在此基础上确定我国艺术体操初级选材的身体形态各指标的评价标准。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。