共查询到20条相似文献，搜索用时 78 毫秒
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舒世昌 《咸阳师范专科学校学报》2001,16(2):55-58
研究了局部对称共形平坦黎曼流形的伪脐点子流形，得到了这种子流形有的一个Simons型公式，作为应用改进了S.T.Yau的一个相应结果。 相似文献
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利用微分方程定性理论，研究了一类基于家庭检测和追踪的最小流行病模型的奇异流形的存在性和稳定性，给出了奇异流形存在性和稳定性的充要条件，讨论了在奇异流形附近发生的非参数跨临界分岔，同时利用Matlab进行数值模拟，验证了基本再生数大于或小于1时流形的稳定性. 相似文献
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利用流形上漉和万有覆盖理论,构造了特殊Hopf流形上的一个叶状结构,并讨论了这个叶状结构与此流形上符合一定条件的函数的联系.另外,又证明了某类Hopf流形上不存在闭的(1,1)阶微分形式. 相似文献
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利用覆盖映射和局部共形Khler流形理论,证明了满足某些条件的局部共形Khler流形一定为Vaisman流形的若干定理.如:Lee向量场为一个群S(eit,t∈R)作用诱导下的向量场一定为Vaisman流形.同时文中也给出判断Vaisman流形的若干充要条件. 相似文献
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在Finsler流形上利用活动标架法，通过沿某一方向提升，获得了弧长第二变分的表达式。将黎曼流形上的Toponogov定理推广到Finsler流形上，由此可进一步将黎曼几何中与之有关的一些定理进行推广而无须通过繁杂的张量运算。 相似文献
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Leibniz流形上的几种运算 总被引：1，自引：1，他引：0
张福娥 《内江师范学院学报》2010,25(8):23-25
通过Leibniz代数的理论来研究Leibniz流形上的运算.首先验证了Leibniz流形上分级张量代数是Leibniz代数,然后由Leibniz代数理论给出Leibniz流形上的三种运算及其性质,为深入研究Leibniz流形理论提供了运算工具,从而进一步完善了Leibniz流形的理论。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献