失稳

Upon to Ljapunov's concept of motion stability, the dynamic instability should be understood as the existence of at least one perturbed motion, which is initially in the small neighbourhood of the undisturbed motion and which starts at t =t〓, when is singular for the first time, depart monotonically from the neighbourhood, this phenomenon is proposed to be referred to as the quasi-bifurcation phenomenon.

按J〓运动稳定性概念，动力失稳应理解为在基本运动的小邻域内至少存在一种干扰运动会偏离基本运动并单调增长，偏离发生在时刻t=t〓，此时切线刚度矩阵奇异。这是所谓准分叉现象。

Load Proportionality Factor curve can entirely describe the buckling process of the PIP systems.

以分析不稳定平衡问题的改进Riks方法被证明为高温海底管道屈曲分析的有效算法，得到的弧长－载荷比例因子曲线能够充分地描述双层管道的屈曲失稳过程。

As the quarry operation evolve, the deeper the pit, the higher and steeper of the highwall, and thus, the influence of blasting vibration may affect the potentially unstable slope which may cause safety problem and result in the shut-down of the overall mining operation.

在露天矿场开采过程中，随著开采深度的增大，其边坡越来越高，特别是对於那些存在不稳定因素的高陡边坡，倘若受爆破震动的影响，极有可能造成边坡的失稳破坏，危及安全生产甚至影响矿山的正常生产秩序。

Numerical example showed that the random manufacturing deviation produced large initial stress, which induced buckling failure of some spatial grid members, and had a large effect on the safety of the grids structures and could not be ignored.

正交正放四角锥网架的算例结果表明，随机制作偏差可以引起的较大的初始应力，使得网架结构局部杆件发生失稳破坏，从而对结构的承载力有较大影响，不容忽视。

The formula of the minimum relative bending-radius, which is related to mechanical property of the tube and constrained by tensile destabilizing, is concluded...

给出与管材力学性能相关，且受拉伸失稳约束的最小相对弯曲半径的计算公式，可用于工艺计算，并对管材弯曲成形设计和工艺分析具有一定的参考价值。

It is difficult Boost converter has good dynamic adjustment performance and stability if the system using a single voltage feedback loop get some interference. The reason is Boost converter has a zero point in right half plane.

Boost变换器的开环传递函数有一个位于右半平面的零点，使得使用单一的反馈电压环难以同时保证系统在受到某种扰动作用时，既有很好的动态品质又不致造成系统失稳。

The omen and post stages of rock burst of the surrounding rock-fault system can be described by analytic way.

给出断层失稳前后的错距和围岩弹性能释放量计算公式。

This work is supported by the Ministry of Science and Technology of China (No. 2004BA901A02). Three new theoretical models are proposed in this paper, which are three dimensional stability analysis model of landslides with single slip surface, three dimensional stability analysis model of landslides with multiple slip surface and failure time prediction model of landslides. Moreover, the kinetic rule of sliding body and rockfall are also discussed in this thesis.

在国家科技攻关计划"西部开发科技行动"重大项目(编号：2004BA091A02)的资助下，本文建立了单滑面滑坡三维稳定性分析模型、多滑面滑坡三维稳定性分析模型和滑坡失稳时间预测模型，同时还对滑落体和崩落体的运动规律进行了探讨。

In this paper, the authors classify the problems into landslide, rockfall and collapse of river bank, and relevant influence factors, for example, geo-material properties, weathering and surface/ground water, and finally suggest some control measurements.

文章根据多年积累的大量实际资料分析研究，总结了南充市区的主要斜坡工程地质灾害类型为滑坡、崩塌及岸坡失稳。其中以滑坡最为常见；影响斜坡工程地质问题产生的主要因素为岩土性质、风化作用和水的作用；针对不同的斜坡工程地质问题，提出了具体的工程防治对策。

The result shows that the disturbances enhance the movement of sand, so that the incipient velocity of local sand will lower than that on the flat river bed and lead to instability of river bed and sand ripple consequently.

实验发现，扰动附近水流紊动大大增强，扰动促使局部泥沙在断面平均流速低于平床起动流速的情况下起动，并促使床面失稳形成沙纹。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。