查询词典 quadric

Their seasonal variations were related with vegetation characteristics such as leaf area index and canopy height as well as wind speed.d had a close linear relationship with h,and the variations of Z0 with h could be expressed by quadric curves.d/h and Z0/h were nearly correlated with LAI,and multiple correlation coefficient could be 0.99 and 0.78,respectively.

芦苇湿地的Z0和d的季节变化主要受叶面积指数、株高及风速的影响。d随h的增加而单调增加，Z0随着h的变化遵循二次曲线，d/h、Z0/h与LAI之间的复相关系数分别为0.99和0.78。

Firstly, quadric surface is approximated with the vertex and its neighboring vertexes of the triangle mesh model, and the first and the second basic quantity are calculated, then estimating the normal and curvature of the mesh vertexes, lastly OpenGL technique is used in realizing the graphics display of the triangle mesh model.

首先根据三角网格模型中的顶点及其邻接点逼近二次曲面，并计算其第一、第二基本量，然后据此估算网格顶点的法失和曲率，最后利用OpenGL技术实现三角网格模型法矢和曲率的显示。

Sequence in the third middle member of Shahejie Formation in a well of Shengli oilfield, the SP data were processed by two-scale wavelet transform using quadric spline wavelet. With this transformation the logging data were expended from one dimensional depth space into two dimensional depth-scale space and wavelet coefficient curves on different scales were obtained.

以胜利油田某井沙三上亚段第Ⅲ层序为例，选用二次样条小波，对该井段SP测井数据进行二进小波变换，将一维测井数据拓展为二维深度－尺度空间，得到不同尺度上的小波系数曲线。

Under the fixed and clamped boundary conditions, a nonlinear differential oscillation equation with quadric and cubic items was presented by the Galerkin method, and a nonlinear free oscillation equation of the shallow reticulated shells with damage was solved.

基于Lematire等效应变损伤原理，计及扁球面网壳各个杆件的损伤影响，根据薄壳非线性动力学理论推导出含有损伤扁球面网壳非线性动力学方程和协调方程，在固定夹紧边界条件下，用Galerkin方法得到一个含二次和三次非线性振动微分方程，并对具有损伤扁球面网壳的非线性自由振动方程求解。

This paper presents a new algorithm for realtime generation of rotating paraboloid images,which can be extended into quadric surfaces.

一、引言计算机实时成象可以反映被模拟对象随时间变化的性能和动作，人们可通过逼真的图象观察其动态效采，可用以对自然、科学和工程等现象进行模拟研究。

For example, quadratic curve and quadric surface are used as primitive element in most modeling/CAD system. The implicit formulae for computing the intrinsic geometric invariant??

随着对参数曲线曲面研究的深入，早在80年代初苏步青教授等就将几何不变量的研究引入并应用到参数曲线、曲面的研究中，取得了重要的成果［1？

Properties to confine types of the quadrics in a quadric pencil in real projective space are summarized and briefly proved in this thesis.

本文对二次曲面束在实射影空间包含的成员的讨论总结了关于二次曲面束的成员组成的一些结论，并给出了非常简洁的证明。

The segmentation results are proper for quadric surface identification and NURBS approximating in reverse engineering.

该算法在大量的噪声网格模型上获得了较好的分割结果，适用于逆向工程中的二次曲面识别和NURBS曲面逼近。

Through teaching the Pythagoras theorem and the make-square method of quadric equation with one unknown, the teaching practice of using mathematics history during mathematics teaching of the secondary school is researched deeply, so the educational value of mathematics history is embodied well.

第四、通过勾股定理的教学和一元二次方程的配方法的教学，更深入地进行了中学数学教学中利用数学史的教学实践研究，更好地体现了数学史的教育价值。

We call this surface the stress quadric.

我们称这个曲面为应力二次曲面。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。