共查询到20条相似文献，搜索用时 746 毫秒
1.
描述了一种在任意三维区域自动生成四面体网格的方法。首先，将经典的Delaunay方法与简化的波前法相结合，进行边界四面体剖分，解决边界还原问题。然后，再次将Delaunay方法与波前法相结合，产生具有最优位置的内部节点，并用Delauny方法将内部节点高效率地插入。最后，进行网格优化以提高网格的质量。中的应用算例显示，本提出的网格生成方法具有很强的健壮性和高效率。 相似文献
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与波前法相结合的Delaunay四面体网格生成方法 总被引：1，自引：0，他引：1
描述了一种在任意三维区域自动生成四面体网格的方法 .首先 ,将经典的Delaunay方法与简化的波前法相结合 ,进行边界四面体剖分 ,解决边界还原问题 .然后 ,再次将Delaunay方法与波前法相结合 ,产生具有最优位置的内部节点 ,并用Delauny方法将内部节点高效率地插入 .最后 ,进行网格优化以提高网格的质量 .文中的应用算例显示 ,本文提出的网格生成方法具有很强的健壮性和高效率 相似文献
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提出了一个对有限元模型进行编码压缩的方法.该模型的拓扑结构可以是任意型式,允许包含四边形单元、三角形单元和梁(杆)单元.有限元模型首先分解成一系列的可定向的流形模型.基于Edgebreaker算法,针对四边形网格遍历的情况引入13对标记,同时对混合网格中的三角形用5对标记来表示.这样,混合网格的连接信息可以采用一种直接的方式进行编码.然后再使用2比特位记录模型中的线框信息.对于完全线框模型,采用扩展后的Taubin方法进行压缩.该压缩算法已经实现并进行了测试.多个复杂模型的压缩实验表明该方法具有很好的压缩效率. 相似文献
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孙广才 《渭南师范学院学报》2005,20(2):3-4
将曲线拟合坐标变换技术应用于三角形网格生成中,形成一种方便,有效的三角形网格生成方法 该方法直接利用边界网格节点的分布信息来控制区域内部网格节点的分布,在数值模拟河道、湖泊等复杂边界的二维流速场时,可快速获得一种适应物理量场变化情形的三角形网格系统,使基于该网格系统的流场计算精度明显提高 相似文献
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针对三维网格生成技术问题,结合波前推进法生成了非结构化背景网格,并使用对角交换以及邻域技术消除畸形三角形单元,改善了三角形网格质量.在阵面推进过程中,通过右手准则确定空间阵面推进方向,利用有效性检查和辅助性检查,校正了阵面相交、包含和穿透等异常问题,生成了非结构四面体网格.使用队列数据结构存储方式,节省了计算内存,提高了网格生成效率,实现了三维网格划分软件(TDGGSLZH)的开发,并通过算例验证了三维网格生成算法的有效性和通用性. 相似文献
6.
四边形有限元网格生成方法关键技术 总被引：2，自引：0，他引：2
本对四边形网格生成法中的边界偏移、最优分割线确定等关键技术作了改进。在该方法中，用户只需指定区域的边界以及边界上的单元尺寸，就可以生成疏密自然过渡的四边形网格。它可与二维刚塑性有限元程序集成为具有网格自动重分功能的有限元模拟系统。利用系统对火车车轮预成形过程进行了模拟，结果表明该网格生成法通用性强，自动化程度高。 相似文献
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全等三角形和四边形知识联系非常紧密，四边形的许多性质、定理都是用全等三角形知识导出的．因此，运用几何转换，适当构造全等三角形，有助于四边形问题的解决。 相似文献
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三角形、四边形是初中几何中最重要的两种几何图形，计算三角形、四边形的面积及证明面积相等问题，已成为中考的热点之一．这类题综合性强、应用性广．本介绍几种计算三角形或四边形面积和证明三角形、四边形面积相等的特殊方法，供大家参考． 相似文献
9.
葛文君 《教育研究与评论(中学教育教学版)》2010,(10):89-90
引导学生探索多边形内角和的一般计算方法时,教师依次出示一个任意四边形、一个任意五边形和一个任意六边形,启发他们联系三角形内角和是180°的已有知识,把四边形分成2个三角形、把五边形分成3个三角形、把六边形分成4个三角形……由此分别得到四边形的内角和是180°×2、 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
13.
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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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
19.
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
20.
Anton Franks 《English in Education》1999,33(2):39-49
This paper looks at the way drama works to bring a model of an arts curriculum into reality. He also shows how drama is valuable when discussed as a separate, autonomous subject in the school curriculum as opposed to one subsumed within English. He argues for a view of the arts and gives an example of a sequence of work in an English GCSE class based around Arthur Miller's play View from the Bridge. From this he draws out several strands about the relationship of the drama curriculum to the individual students and teachers, the school, and to culture. He also emphasises the primacy of performance in drama education. 相似文献