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Moreover, the mean-square tracking error can be made arbitrarily small by choosing some design parameters appropriately. Even with unmodeled dynamics and bounded disturbances presented the controller has good robust performance without need of correct dynamic model and parameter estimation.

并且这种控制器的设计不需要有精确的系统动态模型，不需要未知参数来满足线性依赖条件，不需要具体的系统参数估计，即使存在未建模动态和有界扰动，系统仍然具有很好的鲁棒性。

We have proposed the switching adaptive control law for the systems and designed the Lyapunov function in this thesis. It is proved that the proposed switching adaptive control law guarantees the solutions of the nonlinear systems boundedness and convergence of the tracking error to a residual set based on the Lyapunovs stability theory. The residual set can be made arbitrarily small by choosing a certain design parameters.

文中设计出了这类系统的切换自适应控制律，并构造出相应的Lyapunov函数，基于Lyapunov稳定性理论证明了系统在所设计的控制律作用下，闭环信号都有界并且跟踪误差收敛到一个集合，通过选择适当的参数可使这个集合任意小。

It is shown that under the supervision of the monitoring functions, the switching of control signal will stop after a finite number of switching and the tracking error will converge to a residual set that can be made arbitrarily small by choosing some design parameters sufficiently small.

进而证明，当被控对象相对阶大于1、高频增益符号未知时，在监控函数的监测下，相关控制信号经至多有限次切换后将停止切换，跟踪误差将收敛到一个残集内，且该残集可通过减小某些设计参数而变得任意小。

Byproperly choosing arbitrary parameter,not only the pole assignment of close-loop system can be done arbilrarily but also its other performance demands can be satisfied.obtained.

通过对任意参数的适当选择，不但能使闭环系统的极点任意配置，还可满足闭环系统的其他性能要求。

These studies could provide the basic data and research achievement on analysis the difference of plant transpiration and water consumption between different tree species. It contribute to instructional significance to regulate and control the moisture relations between every factor, and solve contradiction between moisture providence and demanding. At the same time, It will be provided the theoretical evidence for plants choosing and arranging ,and properly using water resources in arboriculture and maintenance.

这些研究为分析造成不同树种之间蒸腾耗水的差异提供了基础资料，对于调控各因素之间的水分关系，解决水分供需关系矛盾有重要的指导意义，同时也为植物选择与配植，栽培与养护中合理地利用水资源提供了理论依据。

Ryan Armitage for the Democrats Choosing a president is no easy matter.

选择总统可不是件容易的事儿。

Great emphasis is put on the logic imagery movement in the process of visual thinking through relating the visual thinking theory of Arnheim's.They are as follows:the logic of choosing images,the logic of organizing images and the logic of distilling images.

通过对阿恩海姆的视觉思维理论的解读，着重诠释视觉思维过程中的意象运动逻辑："自上而下"的意象选择逻辑、"补足"与"重构"的意象组织逻辑、"抽象"和"概括"的意象升华逻辑。

Married when she was just 17 years old, Isabel balances Alex by choosing not to involve herself in the business, focusing instead on their three children, Jaime, Katie and Artie, who are determined to forge their own paths outside the family. Jaime has a deep love for his father but also yearns to go his own way.

当她确实 17 岁的时候，娶了，伊莎贝拉藉由选择平衡亚历克斯不要再在生意方面包括她自己，聚焦改为在他们的三个孩子、 Jaime 、卡蒂和 Artie 上，他决定在家庭之外伪造他们自己的路径 Jaime 有深的爱给他的父亲但是也渴望去他自己的方法。

The paper draws the following conclusions:Brand value is the evaluation to the brand as asset and equity and it can be expressed as brand financial value and brand equity. Brand value comes from the extra utility it takes to the customers by satisfying their special needs. The forming base of the brand value is closely relative to the customers, and there are some other factors infecting brand value such as brand extension. Brand value evaluation includes two parts. One is to have a valuation to the brand financial value, the other is to evaluation of the brand equity by choosing a suitable brand equity model.

经过上述研究，本文得到以下结论：品牌价值是对品牌作为一种资产和一种权益的价值量化，具体体现为品牌财务价值和品牌权益价值；从效用价值论的角度，品牌价值来源于品牌带给消费者的特殊效用；品牌与消费者的关系是品牌价值的形成基础，品牌价值的大小还要受到其他因素的影响；完整的品牌价值测评应由两方面构成：按照收益法原则测评品牌的财务价值；选择适当的品牌权益模型对品牌权益进行测评。

Choosing time delay as the control parameter, the stability of trivial equilibrium is discussed by analyzing distribution of the roots of the associated characteristic equation. It is found that Hopf bifurcation occurs from trivial equilibrium when the delay passes through critical values, then the critical values and their relations with system control parameters are obtained.

以时滞量为参数，通过分析对应线性系统特征方程的根的分布，讨论了平凡解的稳定性，得到了平凡解发生Hopf分岔而失稳的临界时滞量以及临界时滞量与系统控制参数的关系。

I can still vividly recall the impressive scenes you gave. You were among my friends and relatives who accompanied me from my house to the seaport and when the porters were slow to show up, you obligingly carried my suitcase for me.

你对我的种种感人情意，使我记忆犹新，那天你随着我的亲友从家里送我上轮船，搬运工迟迟不来，你毅然替我提着皮箱上船。

St. Nicholas became the patron saint of Russia, where he was famous for his red cape, flowing white beard, and bishop's mitre.

圣尼古拉成了俄罗斯人的守护神，在那里，他以身披红斗篷，留着飘逸的白胡须，戴着主教法冠而闻名。