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A silicon based piezo-electricity socle girder miniature electric generating apparatus is provided with a silica fixing frame, an oxidizing layer, a platinum/titanium lower metallic layer, a piezo-electricity PZT layer, a platinum/titanium upper metallic layer, an electrode insulation protection layer, and a vibrating base; the structure of the silica fixing frame combines the monocrystal silicon wet method etching and dry-etching to process, whose structure is integrated as a whole, and the center part of the structure is in a socle girder shape, which includes a silicium socle girder and a free end mass block; the piezo-electricity power supply device uses a micro-machining technique to integrally machine, and can realize the integration of the power supply and the microelectronic devices.

一种硅基压电悬臂梁微型发电装置,有硅质固定框架1、氧化层2、铂/钛下金属层3、压电PZT层4、铂/钛上金属层5、电极绝缘保护层6、振动底座7构成;硅质固定框架1的结构是利用单晶硅湿法腐蚀和干法腐蚀相结合完成加工,其结构连为一体,其中心部分的结构为悬臂梁形状,包括硅悬臂梁a和自由端质量块b;压电电源装置利用微加工工艺集成加工,能够很好的实现电源、微电子器件集成。

In order to ensure sensitivity and precision of transducer of spring beam,according to "stress concentration" design philosophy,based on reasonable choice of transducer,its strain and strength are calculated using FEM,the paster place of spring beam should be ascertained in reason,and the transducer's maximum strain orientation and measuring range are determined theoretically.

采用弹性梁对旧式液压万能材料试验机下横梁进行改造,为确保弹性梁传感器的灵敏度和精度,根据应用"应力集中"的设计原则,在合理选择传感器结构基础上,采用有限元法对其应变和强度进行计算,合理确定弹性梁的贴片部位,从理论上确定传感器的最大应变方位及传感器的量程。

A Material nonlinear finite element analysis for the cast-in-place reinforced concrete hollow slab that occurs from initial loading, cracking, yielding to failing is carried on. The cracking load, ultimate load, the displacement rules and the principal stress distribution rules of the hollow slab under the vertical loads are obtained. A Material nonlinear finite element analysis for the single span hollow flat-plate floor is also carried on. The function of the concealed wide-flat beams is definite by analyzing the principal stress distribution diagram. The calculating results verify the theoretical analysis and give some important conclusions which are great useful to improve the constructing of the new flat-plate floor.

其次对空心板进行了从加荷、开裂、屈服直至破坏的全过程材料非线性有限元计算,得到了空心板在竖向荷载作用下的开裂荷载、极限荷载及位移和应力分布规律;还对单跨无梁楼盖进行了材料非线性有限元计算,通过分析主应力场明确了柱上暗扁梁的作用;有限元计算的结果验证了以上的理论分析并得到了一些重要的结论,对改进现浇空心板无梁楼盖的构造措施有重要的参考价值。

For the steel truss girder with abroad \\\"bridge crane bar assembled Law,\\\" the level of technology and equipment as a result of the limited duration of its long, far from being able to meet China\\\s bridge construction project as requested in the analysis of large-span suspension bridge mountain girder erection difficulties under the premise that after the election raised more than Aizhai Bridge \\\"self-cross-cable crane swing shift\\\" program to set up the main truss, which is mountainous suspension bridge girder erecting another major innovation.

对于钢桁梁,用国外的"桥面吊机杆件拼装法",由于工艺和设备水平所限其工期长,远不能满足中国桥梁建设工期的要求,在分析山区大跨悬索桥主梁架设困难的前提下,经过多方案比选提出矮寨大桥"自行式跨缆吊机荡移"架设主桁方案,这是山区悬索桥主梁架设的又一个重大的创新。

The curve continual steel box Liang shearing force stagnates the effect finite element analysis box section Liang has the big flexural rigidity and torsional stiffness, the stress performance good, spanning ability big, on the bridge the field of vision open and so on the merits, is in the bridge design the commonly used structural style, when receives under the dead load or the symmetrical live load function winding, because the lifting surface detrusion causes its bending stress to present the non-uniform distribution condition along the Liang width direction, this phenomenon is called "the shearing force to stagnate the effect".

曲线连续钢箱梁剪力滞效应的有限元分析箱形截面梁具有较大的抗弯刚度和抗扭刚度、受力性能好、跨越能力大、桥上视野开阔等优点,是桥梁设计中常用的结构形式,在受恒载或对称活荷载作用下挠曲时,由于翼板的剪切变形致使其弯曲应力沿梁宽度方向呈现不均匀分布状态,此现象称为&剪力滞效应&。

The results show that fibered reinforced wide-beam frames exhibit large displacement and large damping ratio after yielding of structure. Steel fibers contributed to causing less damage during high-level ground motion.

试验结果表明,钢纤维扁梁框架结构屈服后,其最大位移反应和阻尼比均比普通混凝土扁梁框架要大,钢纤维可以降低预应力混凝土扁梁框架在剧烈地震运动作用下的结构损伤。

Fibered reinforced wide-beam frames exhibit large displacement and large damping ratio after yielding of structure. Steel fibers contributed to causing less damage during high-level ground motion.

钢纤维扁梁框架的最大位移反应和阻尼比均比普通砼扁梁框架要大,钢纤维可以降低预应力砼扁梁框架在剧烈地震运动下的结构损伤。

So, some researches are present in this paper: 1 In this paper, a finite element model of curved box girder jointless bridges supported on piles is brought forward, considering the interaction between structure and soil.

本文就无伸缩缝曲线箱梁桥剪力滞效应的分析开展了如下的研究: 1、考虑桩土效应,建立无伸缩缝曲线箱梁桥有限元模型,研究在不同荷载下无伸缩缝曲线箱梁桥剪力滞系数的分布规律。

Based on these hot and key spots in construction of high dams at present, Combining one of the 973 plan projects: Study of Global Stability of Geology Engineering System under Interaction of Several Factors(NO.2002CB412707), the dissertation mainly studies the stability anomaly and corresponding shape optimization. The main contents are as follows:The dissertation advances stability analysis method of arch dams based on arch-cantilever method, that is, the stability of arch ring and cantilever are analyzed respectively based on arch-cantilever method and corresponding formula of stability calculation is established. So the calculation methods of dam stress and stability are unified.

围绕目前高拱坝建设中的热点和重点问题,结合973计划课题:多因素相互作用下地质工程系统的整体稳定性研究(编号 2002CB412707),重点研究高拱坝的稳定转异以及体形优化,现将主要内容归纳如下:本文提出基于拱梁分载法的拱坝稳定分析方法,即在拱梁分载法的基础上,分别分析拱圈和悬臂梁的稳定,建立相应的稳定计算公式,统一坝体结构稳定和应力计算方法。

Based on this,it takes the actual bridge test of stress powdered coal ash high-functioned concrete pile,and offers foundations for the application of stress powdered coal ash high-functioned concrete on railway bridge and choice of designing p.

研究了粉煤灰高性能混凝土梁在重复荷载作用下的力学性能,并探讨了粉煤灰掺量(0%~40%)、混凝土标号(C50~C80)及养护条件等因素对预应力粉煤灰高性能混凝土梁力学性能的影响,在此基础上进行了预应力粉煤灰高性能混凝土梁的实桥测试,为粉煤灰高性能混凝土在铁路桥梁上的应用及设计参数的选取提供了依据。

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Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势,并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。

This dramatic range, steeper than the Himalayas, is the upturned rim of the eastern edge of Tibet, a plateau that has risen to 5 km in response to the slow but un stoppable collision of India with Asia that began about 55 million years ago and which continues unabated today.

这一引人注目的地域范围,比喜马拉雅山更加陡峭,是处于西藏东部边缘的朝上翻的边框地带。响应启始于约5500万年前的、缓慢的但却不可阻挡的印度与亚洲地壳板块碰撞,高原已上升至五千米,这种碰撞持续至今,毫无衰退。