共查询到20条相似文献，搜索用时 187 毫秒
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应用几何不等式理论与解析方法，研究了单形外接球半径与内切球半径之间的关系，建立了涉及单形外接球半径与内切球半径的一些几何不等式，从而加强了著名的n维Euler不等式． 相似文献
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应用几何不等式理论与解析方法,研究了n雏欧氏空间En中n维单形外接球半径与内切球半径之间的关系,建立了涉及单形外接球半径与内切球半径的一些几何不等式,进一步改进了著名的Euler不等式. 相似文献
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利用距离几何的理论与方法研究了欧氏空间中n维单形的几何不等式的稳定性,从两个单形的＂偏正＂度量证明了n维单形四个重要几何不等式的稳定性,并给出这些几何不等式的稳定性版本。 相似文献
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陈士龙 《合肥师范学院学报》2012,(6):14-15,22
本文应用几何不等式理论和解析的方法,研究了n维欧氏空间En中n维单形的Finsler-Hadwiger不等式和n维Euler不等式,建立了关于单形的两个新的几何不等式,推广了已有的结论。 相似文献
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陈士龙 《安徽教育学院学报》2012,30(6)
本文应用几何不等式理论和解析的方法,研究了n维欧氏空间En中n维单形的Finsler-Hadwiger不等式和n维Euler不等式,建立了关于单形的两个新的几何不等式,推广了已有的结论. 相似文献
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张垚 《湖南师范大学教育科学学报》1996,(2)
作者在本文中给出了涉及单形内点到各侧面的距离ｄｉ（ｎ＝１，２，…，ｎ＋１），内切球半径ｒ以及外接球半径Ｒ的两个几何不等式，此外．作者还提出了一个猜想。 相似文献
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杨世国 《山东教育学院学报》1998,(4)
本文获得关于 n 维单形Ω_n 的所有 s 维子单形与所有 t 维子单形内切球半径的两个不等式;本文还获得关于 n 维单形的所有高和它的所有 n —1维子单形的高的两个不等式。 相似文献
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苏化明在 [1]中建立了一个关于单形外接球半径的几何不等式 ,本文对此几何不等式进行了加强推广 ,从而建立了一个更强的几何不等式 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
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献