All quadrilateral mesh automatic generation for regular quadric surfaces based on Auto CAD AME;2. Represent Quadric Surfaces Using NURBS and Calculate the Control Vertecs and Weights;3. Through study,the property is found out that planes cutting edgewise quadric curve and quadric intersections from the quadric surfaces become the harmonic division.

文中采用了射影幾何的方法日本电影黄色，證明了畫法幾何中關(guān)于兩個(gè)二次曲面相交的著名的復(fù)切定理和蒙日定理日韩精品永久免费视频，通過(guò)研究得出了周切線平面和交線平面成調(diào)和分割的性質(zhì)，同時(shí)還得出了處于復(fù)切的二次曲面必存在相公切的二次曲面的性

The results are listed as follows:(1) In peneplain with plenty water-resource, hexagonal spatial structure of urban system can be formed. Due to differential competed function of central places, the hexagonal system is distorted. The result is that the area covered is decr eased and the girth is unchanged——but every border is usually unequal;(2) A pattern of pentagonal system evolves from hexagonal system controlled by a river;(3) A pattern of quadrilateral develops from hexagonal system under two parallel rivers;(4) The equal distance distribution of central places in narrow geographic space has its special reasons. The results are very important for understanding urban's formation and development and urban plan in Huang-Huai-Hai plain.

本文通過(guò)自然地理因素中水文日韩99自拍视频在线观看免费播放、地形這兩個(gè)重要要素對(duì)城鎮(zhèn)體系空間結(jié)構(gòu)形成的影響黄色短视频亚洲无码，分析了華北平原區(qū)在不同要素影響下的城鎮(zhèn)體系空間結(jié)構(gòu)樣式：①在水源充足的準(zhǔn)"均質(zhì)"河北沖積平原上，基本滿足六邊形形成條件晚秋影院手机在线观看免费，但由于周邊中心地發(fā)展競(jìng)爭(zhēng)力不同，故使得正六邊形發(fā)生畸變——覆蓋面積減小而周長(zhǎng)卻保持不變；②構(gòu)建了在一條河流影響下的六邊形網(wǎng)絡(luò)結(jié)構(gòu)朝五邊形網(wǎng)絡(luò)演變的模型中文无码网站；③構(gòu)建了在平行狀河流作用下六邊形網(wǎng)絡(luò)向四邊形網(wǎng)絡(luò)演替的模式一级AAAAAA片毛片在线播放；④指出了在水源充足的狹長(zhǎng)地理空間，城鎮(zhèn)體系空間結(jié)構(gòu)發(fā)育成等間距的現(xiàn)象與原因日韩三级亚洲三级。

In this dissertation, the meshing techniques, especially for unstructured quadrilateral and hexahedral elements, are discussed, and the relative techniques, like the node smoothing and the reduction of matrix profile of a mesh, are also discussed.

本文全面回顧了四邊形和六面體有限元網(wǎng)格特別是非結(jié)構(gòu)網(wǎng)格生成技術(shù)黄色网站亚洲免费啪啪啪，對(duì)相關(guān)的技術(shù)如網(wǎng)格節(jié)點(diǎn)位置平滑和帶寬優(yōu)化等技術(shù)進(jìn)行了總結(jié)，并詳細(xì)的描述了有關(guān)的算法美国A片免费播放免费。

In chapter six, A finite element model to evaluate the mechanics properties of thin wall structure is put forwards. The 4-node quadrilateral Hughes-Liu shell element with five through-the-thickness integration points is employed. The material is assumed to satisfy the elastic-plastic yield condition with isotropic hardening. The single surface contact algorithm is taken to deal with the contact searching. The priori stabilization procedures for the numerical control of the hourglass instability and the penalty method for the evaluation of contact force are used. The classical Coulomb law of friction is employed to evaluate the friction force.

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In the subjects given, learners operate an integrated simulator landing stage of flight data to meet the aircraft and instructors to give students hands-on consolidated results. And then for the visual route trilateral, quadrilateral, and five edge-to-landing phases, with 37 operators' experiments through interviews with senior instructors, the instructors selected seven simulator modules to assess and define the effectiveness of the actual operation of the parameters. Through the way of neural network learning , the establishment of the definition of parameters of simulator training with the students finished the cause and effect comprehensive results relationship, so this research create a set of objective assessment of the effectiveness of flight training simulation platform.

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A quadrilateral or triangular sail set from the after part of the mainmast on a fore - and - aft rigged vessel.

這艘三桅帆船的前桅和主桅上都有相同的斜桅桁下帆和頂帆欧美射射色。

A quadrilateral or triangular sail set from the after part of the mainmast on a fore-and-aft rigged vessel.

帆桁吊在桅桿上一頭漸細(xì)的長(zhǎng)柱，用來(lái)支撐和展開(kāi)橫帆多色视频成在线观看、梯形帆或三角帆的頂端

To establish the constitutive equation of material, the metric tensor for stress , strain and their transformation equations between different configurations are derived, and basic theory of finite deformation as well as elasto-plastic deformation criterion are studied. By analyzing the applicability of different element models, four-node quadrilateral degenerated Mindlin isoparametric element is adopted because of its good versatility, and the element stiffness matrix is derived. The static implicit elasto-plastic finite element equation for complex skin stretch-forming is put forward based on Updated Langrange formulation.

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A two - mast ed sailing ship,square - rigged on both mast s,carrying two or more headsails and a quadrilateral gaff sail or spanker aft of the mizzen mast .

雙桅橫帆船有兩根桅桿的帆船，每個(gè)桅桿上都有橫帆天天爽天天插夜夜摸日日干，載有兩個(gè)或更多的前帆和一個(gè)四邊形的斜桁帆或在后桅的尾部裝有后檣縱帆

A two-masted sailing ship, square-rigged on both masts, carrying two or more headsails and a quadrilateral gaff sail or spanker aft of the mizzenmast.

有兩根桅桿的帆船亚洲色图国产，每個(gè)桅桿上都有橫帆，載有兩個(gè)或更多的前帆和一個(gè)四邊形的斜桁帆或在后桅的尾部裝有后檣縱帆