法线

By means of the fractions of the equation of the non一ideal constrained motion of the particle along the plane curve on the tangential direction and normal direction,the motion speed expression of the particle under this condition is derived,the constrained counter force is further gained,thus some non一ideal constraint problems are solved from the given angle.

通过质点沿平面曲线的非理想约束运动方程在切线和法线方向上的分式，导出质点这一条件下的运动速度表示式，并进一步求出其约束反力，从一定角度解决一些非理想约束问

For a 8 inch mirror of thickness 3/4 inch the thermal equilibrium time should be about 30 minutes.

这给法线在镜面位置的精确测量带来了困难。

Note: if the scale was uniform, then the direction of the normal would have been preserved, The length would have been affected but this can be easily fixed with a normalization.

如果x，y，z三个方向缩放比例相同的话，虽然法线向量的长度改变了，但是方向不变，这种情况是可以用单位化向量的方法解决

This paper discusses the drawing of hyperbola normal through a point outside the hyperbola and points out the unsolvability of geometric drawing method and the unintegrality of optimization method.

对过双曲线外一定点的法线作图问题作了探讨，提出了几何作图法的不可解性及优化法解的不全性。

At first we need to get normals for each triangle vertex, but how to achieve this?

首先我们需要对每个三角形顶点法线，但如何实现这一目标？

As the viscosity of the fluid,such as water and air,is in general small,the viscous force seems to be ignored while compared with other forces,such as inertia force, gravity and press force.

实际流体流动时，由于流体受粘性的影响，在流体表面附近会形成沿法线方向速度变化较快的薄层，这一层我们称之为边界层。

The intersection of the surface normal of the mentioned point with the worm–wheel surface identifies another node.

被提及的点的表面法线的交叉点以蠕虫轮子表面辨认其它结。

When light transmits through aeolotropic crystal,as far as extraordinary light is concerned,there is a smaller included angle between the ray and the wave normal in general,which is usually called walk-off angle .

光在各向异性晶体中传播时，e光的光线方向与光波法线方向一般有一个较小的夹角，即离散角α。

The results indicate that the first ten step natural frequency range from 233.2Hz to 526.8Hz, the natural frequency is higher than the value specified by the standard.6. The profile equations of shaping gear ring are deduced out by profile normal line method. The involute and transition curves are automatically generated through the macro function in Solidworks. And the three-dimension model is built. Based on the three-dimension model, the deformation and dedendum stress is studied.

6应用齿廓法线法推导出了插齿加工的渐开线直齿内齿圈的精确齿廓曲线方程，并通过Solidworks中的宏功能采用Visual Basic语言编程实现了内齿圈齿廓渐开线以及齿根过渡曲线的自动生成，建立了内齿圈的精确三维实体模型，研究了内齿圈的轮齿变形及齿根应力。

Mathematic models of conjugate curves were deduced via enveloping theory and dentiform normal method.

并用齿型法线法和包络原理推导出共轭曲线数学模型。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。