曲面

It was evidenced that the rolling-pass of the Mannesmann rolls is non-linear and the non-linear barrel-shaped rolls are unfavourable for further increasing the production capacity with high effeciency and improving the tube quality.

为了发展我国钢管制造技术，我们从1975年起研究折线轧辊下的变形区，给出它的曲面方程式和子午线方程式，证明了变形区是非线性的。

Then, the pixels of the recovered texture were obtained as a barycentric combination of the colours of the near four pixels.

利用真实图像实现了逼真的曲面造型，验证了该方法的可行性和正确性。

The barycentric coodinates of the horizontal projection figure of coal face are solved with the aid of the formula of geometric centre of gravity.

地下开采煤层的分布形式多种多样，平面分布形式的煤层仅是曲面分布形式煤层的一种简单情况。

As basic element of CAGD, representation, design, display, analysis and handle of curve and surface is main task of CAGD.

作为CAGD系统基本几何元素，自由曲线、曲面的表示、设计、显示、分析以及规格、处理(包括数据结构、数据库、图形的信息形式和调整方式等)问题，是计算机辅助几何设计的主要研究对象和内容。

So many nonlinear evolution equations have been shown to be closely related to motions of curves and surfaces.

因此，很多非线性演化方程都与曲线和曲面运动有着密切的关系。

Machining surface with high efficiency and high prec ision is the aim which the scholars of the field have been aspired for all belon g on this question.

如何高效率、高精度的完成自由曲面的数控加工，是机械制造领域的研究工作者一直追求的目标。

In curve and surface modeling, Bernstein polynomial compositions are widely used for various geometric operations. So it is important to investigate them both in theory and practice.

在曲线曲面造型中，Bernstein多项式复合被广泛用于许多几何操作，因而具有重要的理论和实际意义。

Discusses algebraically and geometrically the properties of the ruled surfaces in the Euclidean three-space, especially, the principal normal surfaces on which there are some special curves, such as Mannheim curves, Bertrand curves and general helices.

在三维欧氏空间中，作为特殊曲线，Mannheim曲线、Bertrand曲线以及一般螺线具有良好的几何和代数性质。讨论了三维欧氏空间中特殊曲线的主法线曲面。

However, it does not indicate that the biconvex Fresenl lens has advantages in all applications since it is application dependent. Therefore, Fresenl lenses should have different parameters for different applications.

但这不表明曲面菲涅尔透镜在像差方面一定比平面菲涅尔透镜更具优势，它还与实际应用场合有关，为此，提出了不同的结构参数设计。

Generally, the Fresenl lens is used for collimation and its structure is planeconvex, but the analysis and comparison of the biconvex and the plane-convex Fresenl lenses with P-W method show that the biconvex Fresenl lens is better because of its specific imaging requirement. The two kinds of the Fresenl lenses were modeled in ZEMAX to validate the conclusion.

从应用角度看，菲涅尔透镜设计属于准直系统，一般采用平面结构，但由于其成像要求的特殊性，通过运用P-W方法进行分析和比较，结果表明：曲面的设计较之于平面更具优势，并在ZEMAX中分别对2种菲涅尔透镜进行建模，验证了结果的正确性。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。