结构群

In chapter 2, we introduce weak hopf π coalgebra and two kinds of special subalgebra over it.Some basic properties are studied to make a basis for the following chapter.

第三章主要是在弱Hopf群余代数上建立Yetter-Drinfeld模，探讨其性质并给出它的等价条件，从而对其结构有更本质的认识。

Finite commutative group; Symmetric bicharacter; Lie color superalgebra ; Left color symmetric algebra ; Left color symmetric structure

基础科学，数学，代数、数论、组合理论有限交换群；对称双特征标；着色李超代数；左着色对称代数；左着色对称结构

Finally, the combination usage of parallel computing and MATLAB is studied, and is utilized on the parallel computing of Finite Element and Computational Fluid Dynamics.

集群监控管理系统自动监控整个并行计算系统的运行状况，把这些状态信息和异常情况保存于数据库，并提供图形化的接口，系统管理员可以方便的查看系统的运行信息、重新定制整个系统的结构。

Geometric Constraint Solving with Conics;2. By comparison, we conclude that the operations on conics are more efficien than those on elliptic curves is concluded.

文中介绍了有限域上的圆锥曲线的点群结构及加法运算，给出了三种不同的方法计算加法，并进一步比较了他们在数乘运算中的效率。

Firstly, the characteristic points of the parallel section curves are extracted, and the characteristic points are connected to construct feature curve.

然后在上述区域划分的基础上，提出结合树形结构利用数据点的法矢量对区域内数据点群完成空间分割，从而形成具有单一表面特征的面片。

The technologies used to solve these problem is presented. The second part proposes a new access method of recycle links of internal speed-up space switching fabrics. It eliminate the main contrariety between network performance and complexity. Combined with dilated Banyan, two types of recycled Banyan network-expanded recycle dilated Banyan and recycle dilated Banyan network are developed.

第二部分提出一种循环线接入方式，使得反馈线数目不再成为交换网络的性能/复杂度的矛盾所在；并结合线群Banyan网形成RDBN交换结构，对RDBN在均匀和非均匀业务模型下的性能进行了理论分析和计算机仿真，得出参数的选择尺寸，并提出使用窗口重整算法以保证信元序列完整性。

Libermann.The early researcheson this kind of manifolds were closely related to Physics and Mechanics.But since1991,S.Kaneyuki published his result on the algebraic condition for the existence ofinvariant〓structures on a coset space,Lie theory has played the most impor-tant role in the study of this kind of manifolds.In particular,dipolarizations in a Liealgebra are closely related to the homogeneous〓manifolds.Dipolarizationsin semisimple Lie algebras and the homogeneous〓manifolds associated withthese dipolarizations have been studied by S.Kaneyuki,Z.X.Hou and S.Q.Deng.Inthe partⅡ of this thesis we study the dipolarizations in some quadratic Lie algebrasand the homogeneous parakahler manifolds associated with these dipolarizations.

Libermann给出的，早期的有关类流形的研究与物理和力学密切相关，自从1991年金行壮二发表了陪集空间上存在不变仿凯勒结构的代数化结果后，李群及李代数理论在这类流形的研究中起着主要作用，特别地，李代数的双极化与这类流形密切相关，半单李代数的双极化的相关几何，金行壮二，候自新和邓少强等人已作了研究，二次李代数是比半单李代数更广且带有非退化不变双线性型的李代数，本文主要研究了二次代数的双极化及相关几何。

Crystal belongs to monoclinic system, space group P2 (1)/c.

晶体结构属于单斜晶系，空间群为P2（1）／c。

As to cyclic codes over finite chain rings, we study their stucture and develop the Fourier Transform method to finite chain rings. The permutation groups of cyclic codes and their extended codes are investigated using their Mattson-Solomn polynomials.

对于有限链环上的循环码，我们研究了它们的结构，并把傅立叶变换的方法推广到有限链环，用循环码的Mattson-Solomn多项式对循环码及其扩展码的置换群进行了研究。

Martensia was characterized by either single or multiple network-banded blades, procarps consisting of a four-celled carpogonial branch flanked on one side by a single lateral sterile group and on the other side by a group of cover cells, and cystocarp scattered over fertile blades.

此属的特点为藻体膜叶状且膜叶具有单或多层的网状结构，其雌性殖果孢枝特化具有侧边单一的不孕枝而另一边有一群覆盖细胞，果孢子囊散生在藻体各处。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。