If fractional equation into Interdisciplinary equations into algebraic geometry problem, the problem will be transformed into quadrilateral triangle problem.

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In the case of non-regularity meshes, the quasi-Wilson element for arbitrary narrow quadrilateral are studied in this paper.

本文在非正則剖分條件下日韩欧精品无码视频无删节，研究了任意窄四邊形上的類Wilson元。

Using the method of analysing Specht element, the application of nonconforming arbitrary quadrilateral element to the unilateral problem is studied, and the convergence analysis and optimal error estimates are given.

利用分析 Specht元的技巧日韩欧美亚洲中文乱码青青，研究將非協(xié)調(diào)任意四邊形單元應(yīng)用于單側(cè)問題综合自拍，給出了相應(yīng)的收斂性分析和最優(yōu)誤差估計(jì)。

An efficient 13-parameter arbitrary quadrilateral plate element is proposed by the double set parameter method and its convergence is proven.

我們用雙參數(shù)法構(gòu)造了一個(gè)13-自由度任意四邊形板元免费公开超碰在线，證明了其收斂性91香蕉在线精品一区在线观看，并進(jìn)行了數(shù)值實(shí)驗(yàn)。

In the second chapter, elementary theories and ideas of one step forming inverse approach were described and warped modification method, implemented by Cook, was introduced into one step forming simulation and based on idea of surface spreading; new quadrilateral element modification arithmetic was put forward. By spreading warped quadrilateral onto plane in local coordinate system, a plane quadrilateral element whose shape and area were equal to original warped quadrilateral element was gotten and internal force vectors of four nodes and stiffness matrix of elements were improved to increase precision of simulations on this plane element.

第二章從一步成形逆有限元法的基本理論和思想出發(fā)美国韩国黄色自拍偷拍片，將Cook基于彈性理論的四邊形單元的翹曲修正算法引入基于塑性的一步成形性多多视频，并且基于曲面展開的思想，本文提出一種新的四節(jié)點(diǎn)單元翹曲修正方案久久av毛片天堂一区毛片，通過把翹曲的單元展開的方法在局部參考系中得到一個(gè)與實(shí)際翹曲單元的形狀與面積非常接近的平面單元欧美wwwxx，在該平面單元中進(jìn)行單元?jiǎng)偠燃皟?nèi)力向量的計(jì)算，進(jìn)一步改善模擬結(jié)果的精度日韩福利短片在线观看网站免费。

The theorems of Ibn al-Haytham, Omar Khayyam and Nasir al-Din al-Tusi on quadrilaterals , including the Lambert quadrilateral and Saccheri quadrilateral , were the first theorems on elliptical geometry and hyperbolic geometry , and along with their alternative postulates, such as Playfair's axiom , these works had a considerable influence on the development of non-Euclidean geometry among later European geometers, including Witelo , Levi ben Gerson , Alfonso , John Wallis , and Giovanni Girolamo Saccheri .

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A quadrilateral distortion metric was proposed, which considered both of element minimal angle and warpage. An mesh smoothing approach of combining Laplacian method and μGA for quadrilateral mesh was presented, which could improve the mesh quality significantly without effect the algorithm's performance.

提出一種綜合考慮單元最小角和翹曲的四邊形網(wǎng)格質(zhì)量評(píng)價(jià)標(biāo)準(zhǔn)日韩毛片无码一区二区三区，以該標(biāo)準(zhǔn)為優(yōu)化目標(biāo)，提出了一種以面積為權(quán)值的Laplacian方法與小種群遺傳算法相結(jié)合的網(wǎng)格光順方法性生活爱爱网址，在兼顧計(jì)算效率的同時(shí)欧美黄片视频免费观看，可有效地優(yōu)化網(wǎng)格形態(tài)質(zhì)量。

Besides, the solution of large equation set can be avoided and the computation efficiency can be increased using the algorithm for the planar parameterization of quadrilateral meshes, so it provides the basis for the reconstruction of parameterization surfaces for quadrilateral meshes.

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The potential text margin in the perspective document image is a convex quadrilateral and in the oringinal document is a rectangle.The relation between the convex quadrilateral and the rectangle was used to determine a homographic matrix.

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The quadrilateral by joining the midpoints of sides in a quadrilateral with tow diagonals perpendicular each over in order is a parallelogram.

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