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At last the results have been applied to the tracking problem of a class of mechanical systems with discontinuous friction term. Chapter 3 mainly deals with uniformly ultimate boundedness of a class of nonautonomous systems with discontinuous right-hand sides and corresponding perturbed systems (in the sense of Filippov solutions). The definitions of globally uniformly strongly ultimate boundedness and globally uniformly weakly ultimate boundedness of discontinuous systems and the definition of globally equiuniformly strongly ultimate boundedness of corresponding perturbed systems are presented firstly.

首次给出不连续系统全局强一致最终有界、全局弱一致最终有界的定义，以及针对于扰动系统的全局强等度一致最终有界性的定义，并基于非光滑的Lyapunov函数得到了不连续系统全局一致强、弱最终有界的Lyapunov定理和扰动系统全局强等度一致最终有界性的Lyapunov定理。

Weakly acidic and basic drug analysis ; fixed pH titration ; distribution coefficient ; acid dissociation constant of drugs

弱酸弱碱性药物分析；固定pH滴定；分布系数；药物酸离解常数

A finite distributive lattice is called a matchable distributive lattice if and only if there exists a plane weakly elementary bipartite graph such that.

一个有限分配格L称为匹配分配格当且仅当存在一个平面弱基本二部图G使得ML。

The strong positive expression located in the gland alveolus and duct of serous gland, as well as myoepithelium of mucus glands. In some cases, blood vessel endothelium and fibrous connective tissue also show weakly positive expression of NF-κB.

NF-κB的表达主要见于浆液腺腺泡上皮和导管上皮，呈强阳性表达；黏液腺肌上皮样上皮呈强表达；间质成分中血管内皮呈弱阳性表达、纤维结缔组织呈弱阳性表达。

So anatase titanium oxide can separate electrum and cavity more effectively. At the same time, anatase has better photoactivity than rutile. Therefore it is significant to research how to prepare stable anatase titanium oxide film. On the other hand, titanium oxide absorbs ultraviolet light strongly (absorption edge is at 380nm) but visible light weakly.

在光催化方面TiO_2的激发必须在高能量的紫外光下才能进行，而到达地面的太阳能中只有3-4%的紫外光，人工紫外光又价格昂贵，所以将光激发红移到可见光区，可降低成本、节省能源。

In the product space of unanimity convex Hilbert, we obtained the theory of existence and uniqueness of best approximation element on weakly closed t convex set .

讨论了凸集及凸包的形态学运算的几个几何特性，并使某些文献中的几个错误结论得到修正和完善。

Berry ellipsoid or pyriform, mostly less than 4 mm, crowned by persistent perianth, exocarp smooth, weakly explosively dehiscent at maturity.

浆果椭圆形的或梨形的，不到多数4毫米，被宿存花被形成冠，外果皮平滑，弱爆炸地开裂在成熟时。

Firstly, by means of multiple scale method the frequency response function of weakly nonlinear vibration system is derived.

首先，用多尺度法导出弱非线性强迫激励系统的频率响应函数。

Many asteroids are weakly bound piles of rubble, held together by their own minute gravitational attraction.

大多数的小行星都是由碎石组成，而这些碎石靠着自身之间微弱的万有引力结合在一起。

In chapter 2, we study a kind of operator algebra acted on the Hilbert space H which is called the closed weakly reducible maximal triangular algebra, denoted by S.

第二章我们研究了一个作用在Hilbert空间Η上的闭弱可约极大三角代数S，证明了S的系数在Β中的任意阶完全有界Hochschild上同调群H_~nS，Β(Η(n≥1)是平凡的。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。