共查询到20条相似文献，搜索用时 109 毫秒
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通过研究单纯形上的Ｂ形式曲面，给出了三角域上Ｂｅｚｉｅｒ．曲面和矩形域上张量积Ｂｅｚｉｅｒ曲面在三维单纯形上的Ｂ形式表示，由此得到了三角域上Ｂｅｚｉｅｒ曲面和矩形域上张量积Ｂｅｚｉｅｒ曲面之间的互化公式，最后把这些结果推广到高维单纯形条件下 相似文献
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基于小波分析的信号突变点探测及其MATLAB仿真 总被引：3，自引：0，他引：3
小波变换突破了傅立叶分析在时域和频域方面的局部化能力，适合对非平稳信号的处理。信号的突变部分包含了信号的许多重要信息。在介绍了小波分析的概念及其时频方面性质的基础上，分析并仿真了小波变换的时频局部化在信号突变部分探测中的理论与应用。 相似文献
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由于多复变函数的理论在诸多方面与单复变函娄的理论有着本质的区别，因而单复变函数的许多性质在多复变函数中已不再成立，本文在引进两个Banac空间的基础上，讨论了一类积分算子的性质，从而将单复变的广义解析函 理论推广到了多个复变量的情形，给出了多复变广义解析函数的表示式及其性质，如广义Liouville定理，唯一性定理，广义最大模原理，凝聚原理和广义多重幂级数，并进一步给出了较一般的复方程组正则解的两类表示式。 相似文献
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翟锋 《青岛职业技术学院学报》1988,(2)
本文建立了广义Г—环上模的Morita结构,并由此得到了Morita定理;用此定理给出了广义单Artin—Г—环结构定理的另一证明方法。 在文[1]中,陈维新给出了广义Г—环的概念,[2]讨论了本原广义Г—二坏的结构,给出了广义Г—环上的模。在此基础上,本文引进了广Г—环上的投射生成模,模的α—张量积从而建立了Morita结构理论。并应用此理论与[2]中一些结果,给出了左、右Artin单广义Г—环的结构定理的另一证明方法。 相似文献
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本文在半P-不变凸集和半（P,r）-前-不变凸函数的基础上,提出了与半（p,r）-前-不变凸函数相关的一类广义凸函数——半P-拟凸函数,探讨了它与一些熟知的广义凸函数间的关系和它的有关性质,以及这类广义函数的局部极小点与全局极小点的关系． 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