结构群

It plays an important role in the study of combinatorial structures.

决定一个置换群的次轨道结构是置换群理论的基本问题之一，它在组合结构的研究中有着重要的应用。

It includes the basic structural theory of groups; groups'actions on sets and the applications of these actions; the basic structures of rings; the properties of uniquely factorized domains; the Chinese Remainder; the extensions of fields; finite fields with applications; the Galois theory with applications.

主要内容包括群的基本结构理论、群在集合上的作用及其应用、环的基本结构和因子分解理论、中国剩余定理、域的扩张理论、有限域及其应用、Galois 理论及其应用。

Then the homomorphism s and isomorphisms of GV-semigroups were given by using the family maps.

定义一类映射，用此类映射描述GV-半群的结构，进一步认识GV-半群的结构。

In third chapter, a model of step structure was introduced, and the fixed points of its Hamiltonian renormalization equations can be used to classify the different Si surfaces.

第三章首先简单的介绍了重整化群方法，然后讲述一个台阶结构的模型，它的重整化群方程的不动点可以用来区分不同的Si表面的台阶结构。

In this paper the similarity of static stability of air floating structure and the relation between static stability and arrangement of cylinder group are investigated.

分析了环境压力对气浮结构相似性的影响，讨论了气浮筒群结构的静稳性与筒群布置的关系。

The paper applies the fractal theory to the research of fractal dimensions of the content of Au in Shuangqiaoshan Group, and discusses the relation.

本文利用分形理论研究了双桥山群金含量的分维数结构特征，并对其含金性进行了评价，初步探讨了双桥山群赋存矿床类型、矿床作用与其分形结构特征之间的关系。

Therefore,a centerless clustering algorithm considering cluster structure's stability is proposed,and cluster maintenance scheme is proposed too.

为了降低路由维护开销，使无中心分群结构很好地适用于大规模自组网，最首要的任务是使分群结构尽量稳定。

After flow and transient stability calculating of the 330kV grid, we got the over-load and hazard lines set. Then we gained the redundant network needed to be built according to the increasing power supply and load in 2010. Adopting regradation step-by-step algorithm by which we can improve the calculation efficiency , we compared the validity of every line, deleted lines with low validity until no redundant line is in the network. At last we got the target network framework adopting the improved ant colony algorithm. Flow distribution, construction investment assessment and target framework of Gansu long-term planning all be considered, from the viewpoint of to be economic and reliability the feasibility of the improved ant colony algorithm is discussed.

在对2006年该网架结构进行了潮流计算与暂态稳定计算分析后，得出了系统的过负荷与危险线路集，并针对2010年新增的电源和负荷点确定了冗余的待建网架，然后利用逐步倒推法比较各待选线路在系统中的有效性，逐步去除有效性低的线路，直到网络中没有冗余线路为止，以此来以提高优化算法的计算效率，最后利用改进后的蚁群算法确定优化后的目标网架结构，并从潮流分布、建设投资估算等方面与甘肃电网远期规划中确定的目标网架进行了比较，从可靠性和经济性角度论证了改进蚁群算法在网架优化中的可行性。

The method is based on a variable structure to control the SVC, wherein, the variable structure control method comprises two aspects of the unbalanced load equalization compensation and the parameter control of a PI controller, wherein, the unbalanced load equalization compensation adopts the SVC compensation susceptance computational method which is based on the synchronous rotation reference coordinate transformation of a virtual symmetrical three-phase system; meanwhile, in the stabilization control of the system voltage, the ant colony algorithm optimization method is adopted to real time adjust and to optimize the parameter kp and ki of the PI controller.

本发明公开了一种静止无功补偿器的不平衡补偿和蚁群优化方法，基于变结构对静止无功补偿器SVC进行控制，其中变结构控制方法包括不平衡负荷平衡化补偿和PI控制器的参数控制两个方面，其中不平衡负荷平衡化补偿采用基于虚拟对称三相系统的同步旋转参考坐标变换的SVC补偿电纳计算方法；同时在系统电压稳定控制时，采用蚁群算法优化方法，对PI控制器的参数kp、ki进行实时调整、寻优。

In the third chapter,We study some geometric properties and spectral propertiesof the Jacobi operator on a solvable extension G of Heisenberg groups H.In the firstsection,we give the definition of G and some fundamental geometric properties on G.Inthe second section,we discuss the Integrability of certain subbundles and the geometricstructure of the induced foliations in case of integrability.In the third section,we studythe spectral properties of the Jacobi operator of G.

可解李群与类对称空间亦密切相关，Damcek-Ricci空间即是广义Heisenberg的一可解扩张李群，在第三章中，我们构造且研究了Heisenberg群的一可解扩张李群G的几何性质，第一节讨论了G的曲率，李指数映射，整体坐标等基本几何性质；第二章研究了TG的某些子丛的可积性及可积时诱导叶片的几何结构；第三节给出了G的Jacobi算子的特征值和相应的特征子空间。

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。