查询词典 perspective projection

In this article, we define a projection from a segment or a polygon to a convex solid and discuss the relationship between the projection and the pattern.

论文一开始先介绍空间中物件对正多面体投影的定义，在此定义下，我们将讨论在正多面体上投影与切割的关系。

Therefore, the primary purpose of the present study is to construct the projection methods in higher order accuracy. Furthermore, the proposed projection methods will be applied to nonstaggered grids, curvilinear coordinates, and moving mesh cases.

因此，本文从提高数值方法计算精度入手，构造了高阶时间精度的投影方法，并将投影方法推广到非交错网格和一般坐标系及动网格中。

Work in this paper focuses on the data mining from chromatographic retention index data. A retention index database that contains about 50000 records of retention index is firstly established. Projection pursuit technique is then utilized to do data mining upon the data in order to find out some valuable information about the relationship between the retention indices and structural descriptors. A novel algorithm for projection pursuit is developed in this work. Samples of alkane, alkene and cycloalkane are investigated.

中文题名化学数据挖掘新算法和定量构性关系基础研究副题名外文题名 New methodology in chemical data mining and foundational research on QSPR 论文作者杜一平导师梁逸曾学科专业分析化学研究领域\研究方向化学计量学学位级别博士学位授予单位湖南大学学位授予日期2002 论文页码总数115页关键词定量构性关系化学计量学数据挖掘馆藏号BSLW /2003 /O6 /2 化学数据挖掘正逐渐引起化学家们的关注。

Based on the multi criteria decision theory and the vector projection, this paper introduces the principle and general steps of grey relation projection method.

介绍将多目标决策理论与矢量投影原理相结合，在工程项目评标中应用灰色关联投影法的基本原理和一般步骤。

Using planar graph to express the three-dimensional objects, or a projection map to express the three-dimensional objects, must be consistent with the projection theory of descriptive geometry.

用平面图形来表达三维立体实物，或用一个投影图来表达三维立体实物，必须符合画法几何的投影理论要求。

Study results indicate that the horizontal projection length of diagonal cracks cannot be predicted accurately when considering shear span ratio and strength ratio of longitudinal steels to stirrups separately. However the horizontal projection length can be well predicted through integrating these two influence factors due to their well representation of the entire process of diagonal cracks' occurring and development.

分析结果表明，单独考虑剪跨比和纵筋－箍筋强度比都不能很好地预测斜裂缝水平投影长度，而将两者结合能够较好地反应斜裂缝出现和发展的全过程，从而准确地计算斜裂缝水平投影长度。

In order to reduce distortions of map projection, a new map projection according to the normal of ellipsoid surface is proposed in this paper.

为更大幅度地减小地图投影变形，提出了按椭球面法线投影的一种新的地图投影方法。

The work of projection from the ellipsoidal surface is not done, which avoids the projection distortion.

由于并未经过从椭球面到平面的投影，从而避免了投影变形。

In chapter 2 we propose a linear equality constraint optimization question , the new algorithm is combined with the new conjugate gradient method(HS-DY conjugate gradient method)and Rosen"s gradient projection method , and has proven it"s convergence under the Wolfe line search.In chapter 3 we have combined a descent algorithm of constraint question with Rosen"s gradient projection, and proposed a linear equality constraint optimization question"s new algorithm, and proposed a combining algorithm about this algorithm, then we have proven their convergence under the Wolfe line search, and has performed the numerical experimentation.

在第三章中我们将无约束问题的一类下降算法与Rosen投影梯度法相结合，将其推广到线性等式约束最优化问题，提出了线性等式约束最优化问题的一类投影下降算法，并提出了基于这类算法的混合算法，在Wolfe线搜索下证明了这两类算法的收敛性，并通过数值试验验证了算法的有效性。

First, by using the properties of knots and the Jones polynomial, we research the relation between them, thereby involving in the projection diagram with n crossings, discuss the state S of the projection diagram L , through the properties of vertexgraph, Euler Formula, one studied the problem of the equal of the knots.

首先，我们利用纽结及琼斯多项式的性质研究了它们的关系，进而涉及了有n个交叉点的纽结投影图，对其投影图L的状态S进行讨论，并通过四岔地图，欧拉公式等性质，研究了纽结等价性问题。

Putt your way through 36 fun-filled holes of minigolf on 3D designed courses with elevated greens, bunkers, bridges and water hazards, among other crazy obstacles.

您的推杆方式，通过36个有趣的填孔迷你的三维设计的课程，以提升绿党，掩体，桥梁和水的危害，除其他疯狂的障碍。

Some participles can be used either as attributes or as predicatives.

有些分词既可当定语用，也可当表语用。