参数表示

In this manner, a developable surface was designed using control planes with Bézier and B-spline basis functions.

基于将可展曲面作为平面单参数族包络面的思想，给出在Bézier和B样条基下可展曲面的参数表示形式。

It shows that some of the geometric construction algorithms that exist for curves can be also generalized to the design of developable surfaces.

基于将可展曲面作为平面单参数族包络面的思想，给出在B啨zier和B样条基下可展曲面的参数表示形式。

Therefore,the simulation validation work can be carried out in a much specified area and the wrong component raising the error can be found.

电力系统元件可有多种模型和参数表示，而实测响应对模型中各参数的灵敏程度却不同。

Firstly,the densities of point defects and line defects in terms of the vector orderparameter fields are obtained directly from the definition of topological charges ofdefects(winding numbers of zero points of the vector order parameters),which aremore general than usually considered and will be a development of the works ofdefects done by Halperin and Mazenko.

本文首先从缺陷拓扑荷(即矢量序参数零点的环绕数)的定义出发得到了以矢量序参数表示的点缺陷和线缺陷的密度。

For the purpose of implementing integrative and accurate SLA-based service management, the SLA parameter representation and parameter mapping have been studied.

北京邮电大学电子工程学院，北京 100876摘要为了实现综合、准确的SLA业务管理，对SLA参数表示及参数映射进行了研究。

Simultaneously, we study the existence problem of a special Weingarten rotation surface s in H_1~3(-1) and give all spacelike and timelike Weingarten rotation surface sin H_1~3(-1) using the parametric representation of rotation surfaces.

同时研究了H_1~3(-1)中一类特殊的Weingarten 旋转曲面的存在性问题，并利用曲面的参数表示，给出了H_1~3(-1)中所有的类空和类时Weingarten 旋转曲面的表示。

Simultaneously, we study the existence problem of a special Weingarten rotation surfaces in H_1~3(-1) and give all spacelike and timelike Weingarten rotation surfacesin H_1~3(-1) using the parametric representation of rotation surfaces.

同时研究了H_1~3(-1)中一类特殊的Weingarten旋转曲面的存在性问题，并利用曲面的参数表示，给出了H_1~3(-1)中所有的类空和类时Weingarten旋转曲面的表示。

Space curve is one of the basic elements in geometric modeling, and its effective representation is the basis of modeling. Parametric representation based on features is a kind of high-level representation including semantic information. In Chapter 4, para- metric representations based on features for free form space curve are investigated, and a parametric model for the loop of plain knitted fabric is established, in which 5 parameters with practical meanings are used to represent the shape of a loop and the relationship between loops. A new shrinkage prediction method for knitted fabric are proposed based on the parametric representation and energy minimizing. Experimental results on some plain knitted fabrics illustrate the feasibility of the proposed method.

空间曲线是造型中最基本的几何元素之一，对其有效的表示是造型的基础，而特征参数化表示是其中一种包含语义信息的高层次表示，本文对空间自由曲线的特征参数化表示进行研究，建立了一种针织物线圈的特征参数化几何模型，采用5个具有实际意义的参数表示织物线圈的几何形状及线圈之间的位置关系，并将该模型与能量极小化的方法相结合，得到了一种能较好地预测针织物缩水率的新模型，对随机选取的一些针织布缩水预测实验表明了算法的可行性。

Using hybrid CSG/Brep representation, the whole solid model is a CSG tree made of leaf nodes with basic Brep, which include triangular mesh, subdivision surface control mesh and basic geometries with parametric representation.

该方法采用混合CSG/Brep表示，实体模型在整体上用CSG树表示，整个模型为基本边界表示的叶节点的组合，叶结点可以是三角网格、细分曲面控制网格或参数表示的基本几何体。

As the basis of inversion, we have summarized the overall expressions for Thomsen's parameters and their physical meanings, deduced the expressions of azimuthally varying NMO velocity that usually specifies an ellipse in the horizontal plane for any arbitrary anisotropy, and derived the expressions for the NMO ellipses described by Thomsen's parameters.

作为反演理论的基础，归纳总结了各类各向异性介质中Thomsen参数定义的形式及其相应的物理意义，推导了水平层状各向异性介质中方位NMO速度的椭圆属性方程及其Thomsen参数表示形式，并根据具体的介质参数，分别计算了HTI介质、正交介质和单斜介质中，在干裂隙和饱和流体填充裂隙的情况下的方位NMO速度。

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。