共查询到20条相似文献，搜索用时 109 毫秒
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陈世平 《泉州师范学院学报》2003,21(6):6-8
对四阶抛物型方程构造一族新的含参数隐式差分格式，适当选取参数时，可得到一个高精度恒稳格式，其截断误差达到O[(△t)^2 (△x)^8]，数值例子表明该格式是有效的。 相似文献
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陈世平 《泉州师范学院学报》2004,22(4):6-8
对四阶抛物型方程构造一族新的含双参数三层隐式差分格式，并证明该族格式对任意非负参数都是绝对稳定，并且其局部截断误差达到O[(△t)^2 (△x)^8]，通过数值例子表明该格式是有效的． 相似文献
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陈世平 《泉州师范学院学报》2002,20(6):1-4
对四阶抛物型方程构造一族新的含参数隐式差分格式，它包含了许多名格式，适当选取参数时，可得到一个高精度恒稳格式，其截断误差达到O[（Δt)^2 (Δx)^6)]，数值例子表明该格式是有效的。 相似文献
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马小宁 《新乡教育学院学报》2005,18(4):76-76
构造了一个二维热传导方程的两层显式格式,截断误差为O(△t △x2),稳定性条件为r=t/x2=t/y2<1/2,优于同类的其它显式格式。 相似文献
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文章基于Pad6逼近,针对四阶抛物型方程周期初值问题。构造了一个无条件稳定的高精度的两层隐格式。它的局部截断误差为0（（△t）^2＋（△x）4）,△t与△x分别为时间和空间步长．误差分析和数值实验均表明,构造的格式比Saul’ev构造的格式精度要高10^-4 - 10^-5阶．从精度及稳定性方面考虑,所构造的格式也比文[4]的显式格式要好． 相似文献
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给出了一个求解四阶抛物型方程高精度两层显式差分格式,证明了其截断误差为O（τ^2＋h^8）,稳定性条件为r=τ/h^4≤264/3601. 相似文献
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本文构造了一个解Schroedinger方程的三层显式差分格式．格式绝对稳定，截断误差为O(τ^2 h^2)． 相似文献
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用待定系数法给出了解一维抛物型偏微分方程初边值问题的两层显格式,此格式的截断误差为O(2τ+h4),且格式在2/9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