查询词典 helicoidal surface

The proposed method is based on the formula of rupture plane orientation determined by the aspect ratio of specified silos and involves the effects of the conical angle of the storage surface, so it can deal with two cases: the conical angle of the storage surface and the flat storage surface.

该方法考虑了贮料顶面倾角的影响，可以处理贮料顶面平堆和锥堆2种工况。

This series of lathes for turning internal and external cylindrical surface, conical surface, and other rotating surface, turning a variety of metric, imperial, modulus and diametral pitch threads, and can pull the drilling and oil and so on.

商品简介：本系列车床适用于车削内外圆柱面，圆锥面及其它旋转面，车削各种公制、英制、模数和径节螺纹，并能进行钻孔和拉油槽等工作。

Irregular surface severely distorts the primary reflections from subsurface. Traditional time shift static correction is valid only under the conditions of surface consistency. CFP-based redatuming from irregular surface provides a new way for solving this problem.

复杂地表条件严重影响了来自地下的反射信息，如果地表一致性的条件不能满足，常规的时移静校正就不再适用，基于共聚焦点技术的起伏地表基准面重建为解决此类问题提供了一种新的思路。

For instance,(1) mountain terrain map: displaying the terrain and topography, is 3D emulation of earth's surface, is convenient for customer to look into the physiognomy, and check the data of input;(2) contradistinguish map of mine well: displaying opposite position relation of the earths surface and workface, user can analysis surface movement and distortion value at every positions of the workface with the map;(3) 3D prediction model: displaying workface, survey dots, survey lines, terrain, movement and distortion in a same map with 3D graphics, revealing the relations of every elements' position;(4) isoline graphics: displaying the value of height, subsidence, incline, movement and distortion with different colors, and giving the value of every color at the side of the map;(5) color cloud diagram: revealing every targets with colors, coloring every point in the map with the color corresponding the value of height, subsidence, incline, movement and distortion and form transitional color in color cloud diagram.

通过井上下对照图，用户可以分析工作面的各个位置的地表移动变形值；（3）三维的预计模型：采用3D形式同时显示工作面、测线、测点、地表地形、地表移动及变形，显示了各要素的空间相对关系；（4）等值线：对地表高程、下沉、倾斜、曲率变形、水平移动和水平变形等各个分量以等值线方式显示。

Based on the previous work of other researchers, we presented the definition of global convex: a surface is globally convex if it happens to be the surface of a convex body or part of the surface of a convex body.

曲面微分几何，总结了自由曲面形状分析技术手段，对著名CAD软件中曲面分析工具特点进行了简要分析，指出了它们对曲面全局形状分析能力的不足。

With the viscosity solution of Eikonal equation, a method is proposed on the 3D reconstruction of convex surface based on an image. Then, the additive saddle surface and multiplicative saddle surface are defined.

利用Eikonal方程的粘性解给出了基于单幅图像的凸面三维重建算法；定义了2类鞍面--加性鞍面和乘性鞍面。

Taking the unknown coordinate in curved surface and curve as design variables, the equation of curved surface as constrained condition, and the distance between unknown coordinate as objective function, optimization is proposed to minimize the distance between curved surface and curve.

建立以曲面、曲线上未知，点坐标设计变量，以曲面和曲线方程为约束条件，以曲线和曲面距离为目标函数的约束优化方法来精确地确定曲面和曲线之间最短距离，同时确定获得最短距离对应的坐标点。

In this paper,from the global viewpoint we first define the nonlinear control system on a two dimensional surface in the three dimensional Euclidean space, give the represwentation of the state equation under a loca coordinate sysgtem of the surface, and study the connectin between the equilibrium state of the nonlinear system and the egodesics on the surface.

我们首先从整体化的观点定义了一种建立在三维欧氏空间的二维曲面上的非线性控制系统，并给出了在曲面的局部坐标系下非线性系统状态方程的表达式，研究了非线性系统的平衡态与曲面的测地线之间的关系。

First, from room temperature to 500oC, the shell structure is amorphous with crinkly and airtight character. The shell structure begins to change into γ-Al2O3 and α-Al2O3 at 900oC. The surface of shells shows nano-sized pores at 900oC from SEM and BET analyses. When heated to 1000oC and 1100oC, the shell forms stable α-Al2O3 structure with smooth surface. Cracks often occur at the triple grain junctions. The specific surface area and the total pore volume of the hollow spheres increase with the calcination temperature.

首先，将锻烧温度由室温提升至500℃时，球壳属非晶相皱褶状致密结构；在900℃时开始有γ-Al2O3相及些许的α-Al2O3相出现，由SEM及BET结果得知，900℃之球壳表面有许多奈米级孔洞出现；当加热至1000℃和1100℃时，球壳形成稳定相之Al2O3结构，壳层表面趋於平滑，且球壳在晶界处有微裂缝存在；由BET 结果得知，比表面积及总孔洞体积会随锻烧温度之增加，有增加之趋势。

The minimal surface have been extensively employed in many areas such as architecture, material science, aviation, ship manufacture, biology and crystallogeny and so on. In this paper we have some element works on minimal surface from the point view of CAGD It is well-known that there does not exist any other quadratic minimal surface except for the plane.

以肥皂膜问题为物理背景的极小曲面问题或者Plateau问题—寻找以给定空间曲线为边界的面积极小的曲面，从18世纪提出到现在一直是微分几何和偏微分方程理论的重要课题，微分几何领域已经有了极其丰富的极小曲面理论。

We are forbidden from giving money to these shoeless, skinny children, as this will perpetuate begging.

向光着脚，骨瘦如柴的孩子施舍是不可以的，因为要招来无休无止的乞讨。

It would be hard not to fall victim to some sharpeyed policeman.

要想不被某个目光锐利的警察抓到，谈何容易。