查询词典 a class of

As an application of the new algorithm, we study the conditions of the origin to be a center and to be an isochronous center for a class of polynomial system.

作为递推公式的应用，我们还解决了一类多项式系统原点的中心与等时中心条件问题。

In this paper, a class of dynamical system in biochemistry reaction is discussed by using the method of qualitative analysis. And, at the same time,the existence, nonexistence and uniqueness of a limit cycle are proved, so that the entire results for the system is obtained.

研究微分方程定性理论的应用，利用定性分析的方法，讨论了一类在生化反应中的动力系统，证明了其极限环的存在性、不存在性及极限环的存在唯一性，从而得到了完整的结果。

This paper gives an exact solution for free vibration of a physically nonuniform straight bar with vary-ing section by the use of a class of integrable linear ordinary differential equation.

本文应用可积的一类线性微分方程求出了非均质变截面弹性直杆振动问题的一个精确解，我们应用这一精确解验证了渐近解的精确度。

The problem of finding real matrix solutions for a class of matrix equation under a submatrix constraint is discussed.

本文讨论了子矩阵约束下一类矩阵方程的实矩阵解问题。

The influence of some rnodified genetic algorithms on searchspeed is also examined. Some genetic operations suitable to the optimization technique areobtained, therefore, a novel way of solving a class of optimizations of functions that cannot be realized using the method of steepest descent is proposed.

文中还分析了一些改进的遗传算法对于该问题搜索速度的影响，得到了适于解决此问题的合理的遗传操作，从而为有效地解决最速下降法所不能实现的某一类函数代化问题提供了一种新的途径。

The existence of global weak solution for a class of generalized Ginzburg-Landau equations with an inhomogeneous boundary condition was studied. Some integral indentities of smooth solution of inhomogeneous initial boundary value problem of Ginzburg-Landau equations were deduced, by which a priori estimates of the square norm on boundary of normal derivative and the square norm of partial derivatives were obtained.

研究具非线性边界条件的一类广义Ginzburg＿Landau方程解的整体存在性·推导了Ginzburg＿Landau方程的非齐次初边值问题光滑解的几个积分恒等式，由此得到了解的法向导数在边界上的平方模以及解的平方模和导数的平方模估计；通过逼近技巧、先验估计和取极限方法证明了Ginzburg＿Landau方程的非齐次初边值问题整体弱解的存在性

An adaptive control scheme,that employs a Gaussian radial basis function networkwith output weights updated on-line according to the Lyapunov stability theory,is sug-gested for regulation of a class of chaotic systems with uncertainties.

四、针对一类带有不确定性的混沌系统，提出基于高斯径向基函数网络的的自适应控制框架，其中网络输出权重根据Lyapunov稳定性理论自适应在线调节。

School covers an area of 113 mu, total construction area of 44,000 square meters, schools, teaching equipment is complete, a class of 10 meet the national standards laboratories, four computer rooms, three multi-media classrooms, three language lab, collection of nine thousand volumes Open-shelf may borrow library, 2 can accommodate 600 students studying in the reading room, 400 meters of track and field, 3500 square meters of restaurants, all of these facilities are for student learning, life provide a strong guarantee.

学校占地面积113亩，总建筑面积44000平方米，学校教学设备完备，10个达到国家一类标准的实验室，4个微机室，3个多媒体教室，3个语音室，藏书9万余册并可开架借阅的图书馆，2个可容纳600名同学就读的阅览室，400米的田径场，3500平米的餐厅，所有这些设施都为学生的学习、生活提供了有力的保障。

A protocol for probabilistic cloning of a class of three-qubit Greenberger-Horne-Zeilinger state and its orthogonal complement state by using three maximally two states as the qua山1m channel is proposed.

基于三个二粒子纠缠态作为量子信道，提出了一种类型的未知三粒子GHZ 态或其正交态的概率克隆方案。

In order to probe into the properties of frequency spectrum for a group of parametric curves, a class of orthogonal complete piecewise k-degree polynomials in L 2[0,1],called U-system, is introduced.

为了探索参数曲线图组的频谱性质，引进一类属于L2[0，1]的正交完备分片k次多项式系统。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。