Cartan例外域的对合及其有界域的形式

本文给出了复维数为１６的Ｃａｒｔａｎ例外域的对合变换，并由此得到了该域的有界域的形式。     

关于复方阵数值域的包含域

本文首先讨论了最小包含域的等价表征，改进与推广了［１］－［３］的结果，其次利用降价法给出了一个新包含域     

关于Brualdi谱包含域的一点注记

关于矩阵的谱包含域的研究是矩阵分析领域中具有重要意义及广泛应用价值的课题．经典的结果有 Ｇｅｒｓｃｈｇｏｒｉｎ圆盘域, Ｃａｓｓｉｎｉ卵形域［１］． Ｂｒｕａｌｄｉ于 １９８２年按环路给出了新的诸包含域．这一阶段性成果改进了经典的圆盘域及卵形域［２,３］．但没有讨论到特征值的排除问题．本文在［２］的基础上给出了特征值的排除定理,改进了经典的Ｇｅｒｓｃｈｇｏｒｉｎ圆盘域及Ｃａｓｓｉｎｉ卵形域之排除定理． 在本文中,我们记全体ｎ阶复方阵的集合为Ｃ（Ａ）表Ａ＝（ａｉｊ）Ｃ的谱,即特征值集合．Ａ的方向图记作…     

一类Reinhardt陆启铿域

由陆启铿猜想在一类Reinhardt域上的解决,得到了一类Reinhardt陆启铿域,同时又给出了此域是非齐性域,从而得到一类非齐性的陆启铿域.     

实二次函数域基本单位的范

作为Ｈ．Ｆ．Ｔｒｏｔｔｅｒ［３］中一个结果的模拟，本文给出实二次函数域Ｋ中基本单位ε的范为Ｎ（ε）＝ｇ的一些充分必要条件，其中ｇ为Ｋ的常数域Ｆｑ的非零乘法群Ｆｑ＾＊的生成元（２├ｑ）。利用图论的语言，本文还给出了Ｎ（ε）＝ｇ的一些充分条件，这些条件对于数域也同样地适用，从而推广了Ｔｒｏｔｔｅｒ［３］和前人工作中关于充分条件的结果。     

非空集类有生成半域的条件

探讨一个非空集类是否一定有生成半域的问题．通过类比的方法提出“非空集类的生成半域”的概念。反例说明并非任意的非空集类都有生成半域．给出非空集类有生成半域的一个充分条件,以及在该条件下非空集类的生成半域的构造方法．最后给出由任意的非空集类构造其生成域的办法．     

第三类典型域上的Cauchy型积分

研究了第三类典型域上的Cauchy型积分，给出了相应的定义，得到了一些结果，使典型域上的Cauchy型积分进一步完善。     

第四类华罗庚域的Bergman核函数

本文给出了第四类华罗庚域H EIV上的Bergman核函数,全纯自同构群以 及semi—Reinhardt域上的完备标准正交函数系.     

华罗庚域的Bergman核函数

给出了4类华罗庚域的Bergman核函数的显表达式.其关键之处有两点：一是给出了它们的全纯自同构群;二是引进了semi-Reinhardt域,并给出了它们的完备标准正交函数系.在此基础上,给出了它们的Bergman核函数的显表达式,这也是方法上的创新之处.     

John域

本文研究了Ｊｏｈｎ域，证明了有界一致域必定是Ｊｏｈｎ域和Ｊｏｈｎ域是拟共形不变量．     

Bezier曲线的矩阵形式及其应用

本文给出了Ｂｅｚｉｅｒ曲线的矩阵形式及其某些应用     

平面Offset曲线的Bezier逼近算法

给出平面offset曲线的Bezier逼近算法,并进行误差分析.     

A sinusoidal polynomial spline and its Bezier blended interpolant

Functional polynomials composed of sinusoidal functions are introduced as basis functions to construct an interpolatory spline. An interpolant constructed in this way does not require solving a system of linear equations as many approaches do. However there are vanishing tangent vectors at the interpolating points. By blending with a Bezier curve using the data points as the control points, the blended curve is a proper smooth interpolant. The blending factor has the effect similar to the “tension” control of tension splines. Piecewise interpolants can be constructed in an analogous way as a connection of Bezier curve segments to achieve C¹ continuity at the connecting points. Smooth interpolating surface patches can also be defined by blending sinusoidal polynomial tensor surfaces and Bezier tensor surfaces. The interpolant can very efficiently be evaluated by tabulating the sinusoidal function.     

双三次Bezier曲面片的光滑拼接

本文根据曲面的总曲率和平均曲率推导出双三次Bezier曲面片拼接的C^2连续条件。     

Judging or setting weight steady-state of rational Bezier curves and surfaces

Many works have investigated the problem of reparameterizing rational B~zier curves or surfaces via MSbius transformation to adjust their parametric distribution as well as weights, such that the maximal ratio of weights becomes smallerthat some algebraic and computational properties of the curves or surfaces can be improved in a way. However, it is an indication of veracity and optimization of the reparameterization to do prior to judge whether the maximal ratio of weights reaches minimum, and verify the new weights after MSbius transfor- mation. What＇s more the users of computer aided design softwares may require some guidelines for designing rational B6zier curves or surfaces with the smallest ratio of weights. In this paper we present the necessary and sufficient conditions that the maximal ratio of weights of the curves or surfaces reaches minimum and also describe it by using weights succinctly and straightway. The weights being satisfied these conditions are called being in the stable state. Applying such conditions, any giving rational B6zier curve or surface can automatically be adjusted to come into the stable state by CAD system, that is, the curve or surface possesses its optimal para- metric distribution. Finally, we give some numerical examples for demonstrating our results in important applications of judging the stable state of weights of the curves or surfaces and designing rational B6zier surfaces with compact derivative bounds.     

两种Bézier曲面形式的转换及几何连续拼接

本文讨论两种Bézier曲面形式的转换关系和转换条件,并给出矩阵域Bézier曲面片和三角域Bézier曲面片拼接的几何连续条件。     

The proof of hermann''s conjecture

This note proves Thomas Hermann's conjecture on the comparison between twoboundaries of the derivatives of rational cubic Bezier curves. The result is valuable for computer aided geometric design.     

G1 Smoothing Solid Objects by Bicubic Bezier Patches

A general and unified method is presented for generating a wide range of 3-D objects by smoothing the vertices and edges of a given polyhedron with arbitrary topology using bicubic Bezier patches. The common solution to the compatibility equations of $G^1$ geometric continuity between two Bezier patches is obtained and employed as the foundation of this new method such that this new solid and surface model is reliable and compatible with the solid modeling and surface modeling systems in the most common use. The new method has been embedded in an algorithm supported by our newly developed solid modeling system MESSAGE. The performance and implementation of this new algorithm show that it is efficient, flexible and easy to manipulate.     

一类非端点插值B样条曲线降阶的方法

降阶算法是B样条曲线和曲面设计的一个基本算法,它广泛应用于组合曲线,蒙皮或扫描曲面等设计中.Piegl与Tiller曾给出B样条曲线的降阶方法.本文给出了解决更一般的非端点插值B样条曲线降阶的方法.新的方法主要是通过对现有的节点插入方法进行分析,给出了一种端点插值递推公式,并利用此公式对Piegl与Tiller降阶方法加以改进,使之能够解决非端点插值均匀及非均匀B样条曲线的降阶问题.     

两类新的广义Ball曲线曲面的求值算法及其应用

本文研究两类新的广义Ball曲线曲面的求值算法及其应用.其一是把Bezier曲线曲面的求值转换到这两类曲线曲面的求值,大大加快了计算速度.其二是给出Bezier曲线与这两类广义Ball曲线的统一表示,并利用这种表示给出它们之间相互转换的递归算法.