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Search Results: 1 - 10 of 144100 matches for " 田建伟 "
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悬臂梁静态几何非线性的有限元分析
Finite Element Analysis of Static Geometry Nonlinear about Cantilever Beam
 [PDF]

罗裴,
Hans Journal of Civil Engineering (HJCE) , 2014, DOI: 10.12677/HJCE.2014.35017
Abstract:
介绍了悬臂梁几何非线性的有限元模型,并对悬臂梁的应力应变关系进行了推导(在线性范围内),在此基础上,利用有限元分析软件,对悬臂梁结构的静态几何非线性进行了有限元分析,研究发现,当悬臂梁结构在受到大变形而出现几何非线性时,现有的应力应变关系不再呈线性关系,而是呈现非线性,其理论推导必须采用非线性方程组来计算,而非线性方程组的求解可采用大变形问题的增量法——T.L法(拉格朗日法)。
The finite element model of geometry nonlinearity about cantilever has been introduced in this paper. The relation of strain-stress about cantilever has been deduced (in range of linearity). Based on this, using finite element analysis soft, the static geometry nonlinearity of cantilever beam structure has been finitely analyzed. The study finds that the existing strain-stress relation is not linear relation when the cantilever beam structure shows the geometry nonlinearity after receiving large deformation, but is nonlinearity, and that the theoretical derivation must be computed by using nonlinear system of equations. But the solution of nonlinear equations can use increment means of large distortion question, which is T.L means (Lagrange means).
输电线路动态增容系统设计与关键技术
The Dynamic Capacity-Increase System of the Transmission Line Design and Key Technologies
 [PDF]

, 王健, 蔡炜, 刘晓,
Transmission and Distribution Engineering and Technology (TDET) , 2013, DOI: 10.12677/TDET.2013.22006
Abstract: 针对输电线路输送能力受制于线路热稳定水平的问题,研制了输电线路动态增容监测系统,简述了其系统基本原理、硬件组成及软件设计等。并对提高导线允许温度可能出现的问题进行了研究,最后得出在确保线路安全运行的情况下,提高现行线路输送能力是可行的。
A dynamic Capacity-Increase monitoring system of transmission lines is developed in allusion to the problem that the power energy transmitted through the lines is constrained by thermal stability level. The article outlines its basic principles, hardware and software design, and studies the problems that may arise by increasing the conductor allowable temperature. Finally, the conclusion is made that improving the existing line transmission capacity in a certain extent is feasible.
应当重视我国军事法学的创立与研究
,
法学研究 , 1987,
Abstract: 当前,我国的法律科学呈现蓬勃发展的大好形势,不少部门法学的研究工作取得了显著成绩,极大丰富了我国法律科学的内容。但是,作为我国法学体系中的一门重要部门法律学科——军事法学创立和研究问题尚未引起法学界的重视。
昆虫抗菌肽诱导进展
涂涛,
中国热带医学 , 2012,
Abstract:
一种简单实用的实验动物中药脑脊液采集方法
,马锋,
宁夏医科大学学报 , 2007,
Abstract: 为探寻一种简单实用的实验动物中药脑脊液采集方法,以兔和大鼠为实验对象,以枕外隆凸为标志,于颈部正中作纵行切口,经枕骨大孔抽取中药脑脊液。结果,大耳白家兔50只,成功率88%,脑脊液量平均700μL;SD大鼠30只,成功率73%,脑脊液量平均76μL。表明经枕骨大孔抽取脑脊液是一种简单实用的实验动物脑中药脊液采集方法。更多还原
浆砌石重力坝加高中弹性模量对坝体的影响
,,梁童
人民黄河 , 2009,
Abstract: ?通过对宝泉电站下水库大坝进行二维有限元分析,研究了浆砌石重力坝加高过程中,新、老坝体弹性模量的差异性对坝体位移及坝体受力的影响,结果表明:当新、老坝体材料弹性模量在一定允许范围内变化时,随着坝体弹性模量的增加,坝体的整体刚度增加,总位移随之减小;坝体内部垂向正应力对新、老坝体弹性模量变化不敏感,坝踵、坝趾垂向正应力对新、老坝体弹性模量变化敏感.
复杂坝基浆砌石重力坝稳定分析
罗全胜,,
人民黄河 , 2009,
Abstract: ?以宝泉电站下水库大坝特殊坝段为例,采用刚体极限平衡法时复杂坝基浆砌石重力坝的抗滑稳定性进行了分析,由其二维有限元计算结果可知,校核水位时为最危险工况,坝体与坝基接触面上的最大垂向正应力和最大切向剪应力均出现在坝趾处.介绍了特殊坝段的极限抗倾稳定验算方法,指出在施工过程中确保坝体与基础充分结合是特殊坝段抗滑稳定的前提条件.
丁羟推进剂燃速计算图象法
德余?,
推进技术 , 1988,
Abstract: 本文用pem模型编制的燃速计算程序,计算了一定压力,一定过氯酸铵(ap)粒径级配条件下不同配方的燃速,求出配方组分与燃速关系方程,绘制出ap/al/htpb系统的等燃速三角图,在图中由配方组分可迅速查找出燃速,也可由给定的燃速选择合适的配方.
I-V型夹芯板在近爆冲击波和 破片群联合作用下防爆性能研究
,?覮,
- , 2019,
Abstract: 针对民用建筑物墙、板构件提出一种新型的I-V型夹芯板防护结构,采用非线性有限元软件LS-DYNA,开展近爆冲击波和破片群联合作用下I-V型夹芯板的防护性能研究.从质量损失、能量吸收和竖向峰值位移响应3个方面,研究了炸药比例距离、炸药起爆位置对夹芯板防护效果的影响,同时对夹芯板的实际防护性能进行了验证.结果表明:炸药比例距离对I-V型夹芯板的防护性能有较大的影响;不同炸药起爆位置对I-V型夹芯板的毁伤程度不同,在轴向增加起爆点的个数并不能显著增大I-V型夹芯板的毁伤程度;有I-V型夹芯板防护的钢筋混凝土板迎爆面只有少量混凝土脱落,且无钢筋外露,背爆面无混凝土脱落,也无钢筋外露,塑性变形区域较小,整体没有形成贯穿破坏,I-V型夹芯板的实际防护效果 很好.
This paper presents a new I-V type sandwich panel structure for civil building wall and plate, and uses the nonlinear finite element software LS-DYNA to study the explosion protection properties of I-V type sandwich panel under the combined loading of close-range blast wave and fragments. In terms of three aspects of mass loss, energy absorption and vertical peak displacement response, the influence of the explosive proportion distance, explosive initiation position on the protection effect of sandwich panels and the actual protective performance of sandwich panels were studied. The results show that the ratio of explosive distance has great influence on the protective performance of I-V type sandwich panels. The damage degree of different explosive initiation points to I-V type sandwich panels is different, and the number of initiation points in axial direction can not significantly increase the damage degree of I-V sandwich panels. There is only a small amount of detached concrete and no reinforcement exposed on the front surface, while on the back surface, no concrete falls off and no reinforcement exposes with lesser plastic deformation area,and there is no penetrating damage to the whole with the protection of I-V sandwich panels. The damage degree of the reinforced concrete slab with I-V sandwich panel is far less than that of the unprotected concrete slab.
pBR322质粒DNA的原子力显微镜成象及剪切研究
,,王琛,白春礼
科学通报 , 1997,
Abstract: 研究DNA分子间和分子内相互作用力,可以帮助人们了解DNA分子的结构及其功能.由于对这些相互作用力进行直接测量时,不仅需要控制体系的稳定性,同时外加作用力又不能对体系产生影响.因此,目前只是利用X射线,光散射和核磁共振等手段对作用力进行直接的物理或热力学测量.虽然渗透压技术已经应用到DNA双螺旋非特定分子间力的测量,但对于具有特定取向的复杂分子相互作用,就需要在单个分子间进行直接测量.原子力显微镜(AFM)可以检测到10~(-14)N数量级的针尖-样品相互作用力,横向分辨率可达0.01nm,而接触面积只有10nm~2,并且可以在近生理溶液条件下操作,因此它是非常适合研究DNA分子间相互作用力的.事实上,利用AFM研究Biotin-streptavidin体系中的单个分子间相互作用以及DNA双链间的相互作用力已有报道.
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