扰动

Parabolized stability equations were used to study the evolution of disturbances in compressible boundary layers.

用抛物化稳定性方程，研究了可压缩边界层中扰动的演化，并与由直接数值模拟所得进行比较。

Since the equation used to study stability is parabolized, the problem can be solved by the marching procedure.

采用抛物化稳定性方程(Parabolized Stability Equations，PSE)研究了非平行流边界层二维、三维扰动波的线性稳定性问题。

In this thesis, different types of stability equations, including Orr-Sommerfeld Equation and Parabolized Stability Equation based on the"slow change"hypothesis and the local method equation which is computed in local range, are derived from Navier-Stokes equation with"small disturbance"hypothesis.

摘要本文从Navier-Stokes方程出发，导出不同形式的流动稳定性方程，包括采用小扰动理论得到的Orr-Sommerfeld方程、基于流向慢变特性而得到的抛物化稳定性方程以及在一小范围内计算的局部法方程。

In this thesis, different types of stability equations, including Orr-Sommerfeld Equation and Parabolized Stability Equation based on the"slow change"hypothesis and the local method equation which is computed in local range, are derived from Navier-Stokes equation with"small disturbance"hypothesis.

本文从Navier-Stokes方程出发，导出不同形式的流动稳定性方程，包括采用小扰动理论得到的Orr-Sommerfeld方程、基于流向慢变特性而得到的抛物化稳定性方程以及在一小范围内计算的局部法方程。

The nonparallel linear stability of the two-dimensional and three-dimensional disturbance waves are studied by the parabolized stability equations.

采用抛物化稳定性方程(Parabolized Stability Equations，PSE)研究了非平行流边界层二维、三维扰动波的线性稳定性问题。

The results of the crystal structure indicated that the deletion of 8 amino-acid residues from the C-terminal end of SNaseR perturbs the conformation of residue Tyr113 and blocks the binding between enzyme and substrate, which causes the biological activity of SNR141 down to 80%of wild type nuclease.

晶体结构的结果表明，从SNaseR C端切除8个残基后，扰动了残基Tyr113的构象，妨碍了酶与底物的结合，使N端片段SNR141的生物酶活力下降为天然酶的80％。

The tree absolute acts of the tragedy are first the entry of the bull when the picadors receive the shock of his attacks and attempt to protect their horses with their lances. Then the horses go out and the second act is the planting of the banderillos.

斗牛策略三部曲的第一步是斗牛的入场，这时，斗牛士助手扰动来自斗牛的进攻，并且用长矛保护好他们的所骑之马，然后，骑马斗牛士离场。

In Section 2.1, we construct a predator-prey system with stage structure on predator and impulsive per-turbations on prey,the predating products is used to increase the predators constitution.

在本章第一节中，构建了一个捕食者具阶段结构与食饵具脉冲扰动的时滞捕食-食饵系统，其中捕食者捕食食饵是为了增强体质。

In Section 2.2,we present a delay predator-prey system with stage structure on predator and impulsive perturbations on prey,the predating products is used to increase the predators ability of birth.

在本章第二节中，我们又构建了一个捕食者具阶段结构与食饵具脉冲扰动的捕食系统，其中捕食者捕食食饵是为了增强生育能力。

BIAN Zhi-hua,ZHANG Li-jie,JING Feng,YU Mei-wanAbstract: The fissure of soft rock of Mesozoic era and Cenozoic era isn't developmental normally. But there exist many pores in this rock and the cementation intensity of this rock is very low. Easy disturbance is notable. Mechanics parameters are valued after rebating test result of rock block. It makes mechanics index of weak foundation to be greatly lower than actual value.

中-新生代软岩一般裂隙不发育，但孔隙多且胶结强度低，易扰动性显著，其岩块试验成果折减后进行岩体力学参数取值，普遍造成软弱地基力学指标远低于实际值，是目前工程界面临的一大困惑。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐