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For example, if a graph has exactly one cycle, then all graphs in its isomorphism class also have exactly one cycle.

"这一概念同构"使我们能够区分形性能固有的结构自己从性能与申述:,数据结构的形,表标号等例如,如果一个,正是一个周期,然后在其所有形类也有同构的一个周期。

The complement graph of its line graph and the line graph of its complement graph.

得到了其补、线、线的补及补的线的特征多项式。

Factors with prescribed properties such as factors including or excluding some given edge, maximum or minimum factors, factor covering and connected factors; 3. Factorizations of graphs; 4. k-extendable graph and its generalizations. Fractional graph theory is a relatively younger research branch.

例如,因子与的最小度,韧度,联结数:邻域并等参数之间的关系;2·研究的有限制条件的因子,例如,有约束条件的因子,的连通因子,的最大最小因子;3·的因子分解;4·k-可扩及其推广等。

Let G be a connected and simple graph with p order, the complement graph G is the union of a complete bipartite graph K n,m and an empty graph K.

设G为p 阶连通简单,其补G为完全偶Kn,m 及空K的并,笔者利用完全偶的谱的特性,获得了G的特征根分

All above laid a foundation for the research of polarimetric information processing and application. Then, target optimum polarization and polarimetric synthesis technique were studied. By constraining polarimetric states of transmitting and receiving antennas, co-polarized and cross-polarized signatures were obtained. Because the received wave was partially polarized, completely polarized, completely unpolarized, and total available power signatures were defined based on the power of the return wave.

接着,论文深入研究了目标最佳极化和极化合成技术,通过约束收发天线的极化状态可以得到共极化特征和交叉极化特征,由于雷达接收的电磁波通常是部分极化的,根据接收波的平均功率密度可以得到未极化特征、完全极化特征和匹配极化特征,在极化特征空间中搜索可以很容易地获得目标的最佳极化,这些目标最佳极化可以作为极化目标识别和分类的极化特征。

This implies the existence of a polynomially bounded algorithm to find a shortest contractible cycle, a shortest separating cycle, and shortest cycle in an embedded graph in the projective plane and answers the open problems raised by Mohar and Thomassen in the case of projective plane embedded graph.

另一方面,通过定义嵌入的几何对偶及其相应的嵌入系统,得到几何对偶中的可分离圈就对应于原中的割;反之,若几何对偶中的割在原中对应于一个圈,那么该圈一定可分离。

Solubilities and physico-chemical properties in the solution of these systems were determined. According to the experimental data, equilibria phase diagrams and physico-chemical property -composition diagrams of ternary systems were plotted; Equilibrium phase diagrams and corresponding water content diagrams of quaternary systems were finished; Stable and metastable phase diagrams, corresponding water content diagrams of the quinary systems at 288K (saturated with Li2CO3) were also plotted.

测定了上述各体系288K平衡液相中各组份的溶解度及主要物化性质;绘制了三元子体系的相,物化性质—组成;绘制了四元子体系的干盐及相应的水;完成了该五元体系稳定及介稳平衡体系为Li_2CO_3饱和的投影相,水含量

In order to investigate the relationship of solubility between vanadium and the other co-existing ion in soil. The phase equilibria of the quinary systemNaVO_3 + KVO_3 + NaH_2PO_4 + KH_2PO_4 +(NH_2)_2CO + H_2O and its five quaternary sub-systems were studied at 298K with isothermal dissoluble method. According to the reference, all these systems are not reported yet. The solubilities and the physico-chemical properties such as density, conductivity, pH value and refractive index of the equilibrium solutions were determined. Based on the determined values, the solubility stereo-diagram and projected-diagram( saturated with KVO3), projected-diagramsaturated with (NH_2_2CO, and water content diagram of the quinary system, isothermal solubility diagrams of the quaternary sub-systems, and the physico-chemical properties-composition diagrams of the equilibrium solutions were plotted.

为探明土壤中钒的溶解性同土壤中主要共存离子间的关系,本论文采用等温溶解平衡法研究了文献中还未见报道的五元体系NaVO_3+KVO_3+NaH_2PO_4+KH_2PO_4+(NH_2)_2CO+H_2O及其五个四元子体系298K相平衡关系,测定了这些体系298K时各组分的溶解度及平衡液相的密度、电导率、pH值和折光率等物化性质,并绘制了五元体系溶解度空间立体,以KVO_3为饱和的投影,以(NH_2)_2CO为饱和的投影、水及四元子体系的溶解度等温、水和平衡液相物化性质一组成

Experiments show that rhomb partitioning is more powerful in suppressing block artifacts than square partitioning, results in much higher reconstructed image quality, but takes longer encoding time; 2 For solving exhausting encoding problem of fractal image coding, we present a fast rhomb-partitioning fractal image coding based on neighbor-searching; we present a fast rhomb-partitioning fractal image coding based on block classification; we present a fast square-partitioning fractal image coding based on neighbor-searching, block classification and wavelet transform.

2针对分形象压缩编码过程非常耗时的致命弱点,提出了基于邻域搜索的菱形块分割的快速分形象压缩编码方法,提出了基于块分类的菱形块分割的快速分形象压缩编码方法,提出了基于邻域搜索·块分类和小波变换的方块分割的快速分形象压缩编码方法,实验结果表明,我们提出的快速分形象压缩编码与传统的分形象压缩编码相比,编码速度提高了近40倍。

In the last chapter,we constructa bipartite graph by all 1-dimensional subspaces and all maximal totally isotropicsubspaces of symplectic space,and obtain that this graph is a distance-semiregulargraph,its bipartite half is the complement of symplectic graph.

最后,我们利用辛空间中的所有一维向量子空间及极大全迷向子空间构作了一类二部,证明了此是一个距离半正则,其二部半是辛的补

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Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在,'歼灭战perfuming自己与胡努特,那麼,他来到和SAT 。

The shamrock is the symbol of Ireland and of St.

三叶草是爱尔兰和圣特里克节的标志同时它的寓意是带来幸运。3片心形叶子围绕着一根断茎,深绿色。