曲面

In the second chapter, elementary theories and ideas of one step forming inverse approach were described and warped modification method, implemented by Cook, was introduced into one step forming simulation and based on idea of surface spreading; new quadrilateral element modification arithmetic was put forward. By spreading warped quadrilateral onto plane in local coordinate system, a plane quadrilateral element whose shape and area were equal to original warped quadrilateral element was gotten and internal force vectors of four nodes and stiffness matrix of elements were improved to increase precision of simulations on this plane element.

第二章从一步成形逆有限元法的基本理论和思想出发，将Cook基于弹性理论的四边形单元的翘曲修正算法引入基于塑性的一步成形，并且基于曲面展开的思想，本文提出一种新的四节点单元翘曲修正方案，通过把翘曲的单元展开的方法在局部参考系中得到一个与实际翘曲单元的形状与面积非常接近的平面单元，在该平面单元中进行单元刚度及内力向量的计算，进一步改善模拟结果的精度。

We also give the condition and the arithmetics of the continuity of curve and surface.

为此对曲线曲面连续的条件和算法进行了研究。

Objective To explore the value of curvature plane reconstruction with multislice spiral CT in the diagnosis of lumbar vertebral arthrosis.

目的 探讨多层螺旋CT曲面重建成像在诊断腰椎小关节病中的应用价值。

Thus, the towering temples of south India, easily identifiable by their ornately sculptured surface, are associated with a great many crafts and performing arts of the region.

因此，高耸的寺庙南印度，易于识别其华丽复杂曲面，都与许多工艺品和表演艺术的地区。

This brush 10 has a curved core 11 to which the bristles are connected, and presents a section varying over at least a part of length of the brush in the geometrically non-similar form. The above section at least at one point of the core is asymmetric in relation to a plane perpendicular to the plane of curvature of the core in the above point.

本发明涉及一种刷子10，具有连接有刷毛的弯曲轴芯11，在刷子长度的至少一部分上具有变化的截面，且该变化方式在几何上是不相似的，位于轴芯的至少一点处的所述截面相对于垂直于所述点处轴芯的曲面的平面是不对称的。

Both of them are the normal distance of the tangent plane at the check point on the limit state surface in the generalized stochastic space and the asymptotic formula for Laplace''s integral respectively.

提出了利用广义随机变量空间失效极限状态曲面上验算点处切平面法线和Laplace型积分渐近公式两种确定任意分布的荷载变量相关下结构的可靠指标的新方法，改进了现行防波堤失效概率计算理论。

A curve on a surface of revolution, formed by the intersection of the surface with a plane containing the axis of revolution.

二次曲面的由二次方程式所定义的几何平面的，或与其有关的

Revolve : When revolving a curve that intersects the axis of revolution, only part of the curve was revolved.

Revolve指令：修正会建立损坏物件的错误。Revolve指令：修正以封闭的多重直线建立曲面时的错误。

And the GA optimization algorithm in product ergonomics form design is also illustrated by the case of wheelchair backrest.

最后以轮椅靠背的曲面设计和优化为例，阐明了遗传算法在产品人机形态方面的设计和优化方法。

As a result of the different position of prestressing strands, the structure system has multiform space shape, such as barrel vault, hypar and dome.

通过改变预应力索在网架中的位置，可张拉得到不同的曲面形状，如柱面、穹顶和鞍形网壳。

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。