再建立

Based on the equilibrium equation of an arch element the cubic nonlinear dynamic model with second order is established and the nonlinear differential dynamic system without constant term is obtained through a transfer process of T=U+b. Hence three fixed points and the homoclinic orbits are found. The critical condition of the chaotic vibration of the elastic arch is given by using the method of Melnikov function. The numerical results of the stationary and chaotic motion are given and discussed.

首先利用拱的单元平衡方程建立了拱的二阶三次非线性动力学模型；然后通过变换使方程转化为不含常数项的非线性微分动力系统，并由此得到无扰动系统的3个不动点与同宿轨道；再用Melnikov函数法给出了发生混沌的临界条件；最后给出了该系统出现定常运动和混沌运动的数值结果。

This is because economics is founded upon the premise that individuals make choices among options, and constrained maximization sets an essential restriction on behaviour without which individual choices would become unpredictable.

这是因为经济学主要是探讨人们如何作出选择的行为，而「有条件限制最大化」的公理在行为上建立最主要的限制。由於没有了「有条件限制最大化」的公理，人们的行为便没可能再推测。

Based on the basic diffusion theory, the general model of the contaminant transport in the environment is presented.

然后从最基本的扩散理论入手，建立了污染物质在环境介质中传输的通用模型，再结合土壤这一特定的环境介质，对传输模型进一步深化，得出能准确地表达出污染物在各种土壤条件下的运移过程的数学方程，并给出了各种典型情况下的解析解。

Derive the equations of continuity by using the method of infinitesimal based on the mass balance equations and the differential equations of gas and oil phase fluid flow.

再根据物质平衡原理，利用微元法分析凝析油气渗流规律，建立连续性方程，从而导出凝析油气渗流微分方程。

Based on the modal superposition method and the exact solution of beam nature vibration, the motion equations of the simply supported and continuo...

基于模态叠加法和梁固有振动的精确解，建立了移动荷载作用下简支梁和连续梁的运动方程；利用样条最小二乘法逼近桥梁应变响应，由样条数值微分求得响应导数；再通过Tikhonov正则化方法结合奇异值分解技术得到了荷载识别的正则解。

Yoga I do mostly for toning up and burning fat and I stretch because it makes the muscles I build look leaner and longer + I want to become a contortionist.

瑜伽 ，我的色调和燃烧脂肪，我舒展，因为它使大多数的脂肪不看看我的肌肉建立精简，再+我想成为柔术。

Taylor sees it, three priorities probably are: the sustainable development and urban greening, replenishment and reutilization of the incumbent urban areas, and the expansion of this cosmopolis and its corresponding satellite cities.

需要迫切解决的三个关键问题是：可持续发展和城市绿化；补充与再利用现有城市区域；上海城市的扩大与建立相应的卫星城市。

Sensitivity comparison between the novel one-step RT-PCR and DAS-ELISA for PVX revealed that the former method was 20 times more sensitive than the later one. The novel one-step RT-PCR system was also successfully tested with field samples of turnip mosaic virus in 8 different crucifer vegetable crops.

为验证该设想，本研究建立了一步RT-PCR技术扩增体系，并利用该体系扩增和分析了国内几种蔬菜作物部分CMV分离物的2b基因序列同源性，选择特定分离物的全长2b基因，先利用PVX侵染性载体初步分析其正义和反义序列间的互作，再构建植物表达载体转化烟草和番茄，并研究转基因烟草抗CMV的表现，获得了抗CMV的转基因烟草植株。

To this, chinese manage capital carries out copartner Qian Xuefeng to suggest, landing formally do poineering work board before, might as well build a similar OTC (Over The Counter, curbstone market, trade adversary talks things over under the counter undertake trading man-to-manly) trade definitely platform, let an enterprise grow one year first on platform, it is mature to wait go up again, also can reduce the probability that retreat city as far as possible so.

对此，汉理资本执行合伙人钱学锋建议，在正式登陆创业板之前，不妨建立一个类似OTC（Over The Counter，场外交易市场，交易对手私下协商进行一对一的交易）的准交易平台，让企业在平台上先成长一年，等成熟了再上，这样也能尽可能降低退市概率。

In China an eight-step approach to the cis-bicyclic amine was adopted, including five-step route to cyclopentane-...

国内工业生产方法是以环己酮为原料经五步反应合成中间体1，2-环戊烷二甲酸，再经过三步反应完成顺式构型的建立和氮杂五元环的合成。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。