不变

The results are applied to absolute stability problems, and the time-varying circle criterion is given.

这样就弥补了以往的结果只能处理时不变问题而难以处理时变问题的不足。

Gregory Bateson put it telegraphically when he said,"Adaptation is change in the service of nonchange."

格雷戈里贝特森则用一种电文式的简洁来说明这一点："适应就是以万变求不变。"

The quaternary GalnAsSb can be used for the bolometer, IR radar, monitoring of the environment, trace gases and other interesting purpose for its special response wavelength. GalnAsSb infrared detectors are novel compound detectors with advantages of fast response, high sensitivity, high stability, low price, especially its character to work at room temperature.

当其晶格参数与InP衬底的晶格参数相匹配时，其覆盖波长基本不变(1.6～1.7μm)：但是匹配于InAs衬底时，覆盖波长从1.7μm变到3.4μm；而与GaSb衬底晶格匹配时AlGaAsSb、GaInAsSb四元系化合物材料可以覆盖从1.7μm至4.3μm的波段，所以GaInAsSb四元系化合物材料在红外成像、红外技术方面有重要的实用价值，同时在未来的超低损耗光纤通信中也具有潜在的应用。

Therefore, the structure could be stable. However, the structure was changed to amorphous when the strain level was over 15%. At the same time, the binding energy increased rapidly and the structure stability was reduced. During the deformation process, both the bond angle and bond length were significantly affected by the strain level.

这表明Ni纳米线的径向很软，结构之间几乎没有能量转换，且其稳定性基本不变；当压缩程度大于15%时，Ni纳米线结构变为无定形结构，它的结合能变大，且变化很快，表明其稳定性降低；压缩程度对Ni纳米线键角和键长的分布有着很大的影响。

Cable reel motor torque constant tension which has the characteristics When the load increases in the motor output shaft speed will automatically come down, volume Rao assured when cable tension unchanged. Rao nature of this excellent performance closely integrated with the Volume; Cage used motor hysteresis coupling increases in size, functionality, easy installation, the constant tension similar characteristics, we can under the conditions required output torque. They can pull the cable external circumstances, hysteresis coupling protect cables; using torque motor controller to increase frequency hysteresis couplings Surge part because of the cable reel SCR converter using a new technology operation, smoothing adjustments to the motor terminal voltage, thereby ensuring that the output torque of the motor unchanged. so that the cable can smooth the road with the truck

其中力矩电机电缆卷筒具有恒张力的特点，当负载增加时电机的输出轴转速能自动随之降低，保证电缆卷饶时张力不变，这个优越的性能与卷饶性紧密结合；采用笼型电机加磁滞式联轴器具有体积小，功能全，安装维护方便，近似恒张力等特点，既可以根据工况需要输出力矩，又可以在电缆受外力拉住的情况下，通过磁滞式联轴器保护电缆；而采用力矩控制器加变频电机加磁滞式联轴节的电缆卷筒因其调压部分采用可控硅变流新技术，可以平滑地对电机的端电压进行调节，从而保证了力矩随负载的变化而改变，使电缆能平稳的跟大车的行进。

Chapter 1 briefs the relation between invariance and computer vision and summarizes the research and application of invariance in computer vision. Chapter 2 first derives the transformations of three camera models, then makes the correpondences between the models and three typical geometrical transformation groups by analysing the transformations respectively. The correspondences supply the theoretical basis for applying geometrical invariants to resolve the problems of computer vision. In Chapter 3, we describe the geometrical invariant theory and prove some geometrical invariants of coplanar points, lines or conics by algebraic method. In order to use the invariants of conic pairs to describe general 2D shapes, we discuss the perspectively invariant representation of planar curves using conies in detail. A system consisted of two TMS320C25 and based on moment invariants is introduced in Chapter 5. The system can recognize more than 30 different shapes of object model or more than 10 plane models with similar shape in real time.

第一章简述了不变性与计算机视觉的关系，以及计算机视觉中的不变性研究和应用概况；第二章推导了计算机视觉中常用三种投影模型的变换关系，通过对这三种变换关系的分析，分别建立了这三种投影模型和几何学中的三种变换群之间的一一对应关系，为几何不变性在计算机视觉中的应用提供了理论基础；在第三章中，我们介绍了几何不变性的理论，并且用代数方法证明了共面点、直线、二次曲线的几何不变量和射影不变量；为了把二次曲线的不变量用于一般二维形状描述，在第四章中我们详细地讨论了用二次曲线实现一般平面曲线的透视不变性表示的方法；第五章介绍了用两片TMS320C25构成的、基于不变矩形特征的运动目标实时识别系统。

The experimental results show that at a constant system pressure, the weight percent of millets distributed into the collector B (connecting with the moving branch) decreases with increasing superficial air velocity with a constant angle betwe...

试验结果表明，在发送压力基本保持不变的条件下，当活动支与主管间夹角不变时，分配到活动支侧收料仓B的固相颗粒质量分数随表观气速的增大而逐渐减小；当活动支与主管间夹角发生改变时，分配到收料仓B的固相颗粒质量分数随夹角的增大而逐渐减小，且相较于表观气速，活动支与主管间夹角的变化对分配到收料仓B的固相颗粒质量分数影响较大。

This article have two parts: G-fixed ideals and some ideas with stable Betti numbers on shifting operations.

中文摘要：本文分两部分：G-不变理想与移位运算下保持分次Betti数不变的一些理想。

A numeric method of calculating invariant probability distribution for chaotic map is derived. The method is particularly useful for some realistic experimental systems whose transfer probability matrixes are easy to be determined.

提出一种计算混沌映射不变分布的数值方法，该方法特别适合于求解从实验中获得的样本数少，但转移概率易于确定的实际混沌系统的不变分布。

At the last,this paper gives a norm q that can suggest the level of auditing independence.This paper analysis the factors those affect the auditing independence economically.When the cost is constant,there is a negative relationship between the auditing independence and the accounting firm's capital stock paidup, and the auditing independe...

对影响审计独立性的因素从经济学的角度进行了剖析，在假定成本不变的条件下，得出了审计独立性与被审单位的规模成反比；假定收入不变的条件下，得出了审计独立性与会计师事务所注册资本金成正比，同样条件下合伙制事务所比有限责任公司制事务所独立性强的结论。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。