查询词典 system

In this thesis, we take the delay r as a bifurcation parameter to investigate the Hopf bifurcation phenomenon in system (1). By analyzing the associated characteristic transcendental equation of system (2), and using the Hopf bifurcation theorem, we obtain one condition for the existence of Hopf bifurcation in system (1). Furthermore, based on the center manifold theorem and the method of normal form, some interesting results about the properties of Hopf bifurcation are obtained, including the direction of Hopf bifurcation and stability of Hopf bifurcating periodic solutions.

我们以时滞T作为分支参数，研究了系统(1)的Hopf分支现象：通过分析系统(2)的特征超越方程，结合利用Hopf分支定理获得了系统(1)的Hopf分支存在的一个条件；利用中心流形定理和正规形方法分析了系统(1)的Hopf分支的性质，包括分支的方向和分支周期解的稳定性。

Its are macroscopical the mechanism is to the society public finance transforms, building the; of effective finance system that can assure to oneself is stabilized and make boom policy instrument is to perfect system of two class bank, build the effective banking system that can form good and macroscopical environment and reasonable financing channel.

其宏观机制是向社会公共财政转变，并建立能保证自身稳定和成为景气政策手段的有效财政体系；是完善两级银行体制，并建立能形成良好宏观环境和合理融资渠道的有效金融体系。

It is focused on a valve-controlled asymmetric cylinder system. The cause and compensation method of friction are researched, and the influence of system friction on electro-hydraulic servo system is analyzed. Then the friction is outline measured and online observed.

以阀控非对称缸系统为研究对象，探讨了摩擦力的产生原因和补偿方法，分析了液压缸的摩擦力对电液伺服系统的影响，对摩擦力进行了离线计算和在线观测两方面的研究。

The results show that more modalities can be excited from asymmetric system and that there is little difference between the power flow spectra of rigid raft system and flexible raft system in middle and low bands of frequency, but there is considerable difference at high frequency.

研究结果表明，非对称系统能激励出更多的模态；在中低频段弹性浮筏系统和刚性浮筏系统的功率谱没有很大的区别，但是在高频段差别则很明显，浮筏的弹性模态起着主要作用；减小隔振器的刚度并适当增加隔振器阻尼不仅可以降低传递到基础的功率谱，同时还可以抑制共振减小冲击。

It includes stability analysis and control of gyroscopic system, analog controller optimization, stability analysis of an active magnetic bearing rotor system based on a full-order or a reduced-order observer, and identification of dynamic coefficients of asymmetric system.

本文主要研究了主动磁轴承转子系统的稳定性、控制器设计和系统动特性参数辨识问题，包括陀螺效应对系统稳定性的影响和抑制方法；模拟控制器的设计和带全阶观测器的系统性能分析；对非对称结构系统动特性系数辨识的研究。

The general infinite dimensional modal system describing liquid nonlinear sloshing is derived first by pressure integral variational principle. After selecting two dominating modes and three secondary modes based on the Narimanov-Moiseev third order asymptotic hypothesis, the infinite dimensional modal system is reduced to a five dimensional asymptotic modal system.

首先通过压力积分变分原理推导出描述液体作非线性晃动的一般形式无穷维模态系统，然后根据 Narimanov-Moiseev三阶渐近假设关系，通过选取二阶主模态和三阶次模态，将无穷维模态系统降为五维渐近模态系统。

This paper consists of three parts:We first consider the non-autonomous predator-prey system with both Beddirigton-DeAngelis functional response and dispersion. By using comparison theorem of differential equation, we study the permanance of the system. After that, by constructing suitable Lyapunov function, we obtain some sufficient condition which guarantee the existence of globally asymptotically stable almost periodic solution of the system.

本文研究三方面的内容：第一部分考虑具有扩散和Beddington—DeAngelis功能反应的捕食-食饵系统，利用微分方程比较原理得到该系统一致持续生存的条件；通过构造适当的Lyapunov函数得到了该系统存在全局渐近稳定概周期解的充分条件。

With the help of comparison theorem, sufficient conditions which guarantee permanence of the system are obtained. For the almost periodic case, by constructing a suitable Liapunov function, we obtained that the system has a unique globally asymptotically stable positive almost periodic solution. Finally, we study a multispecies predator-prey system with stage structure and Holling II type functional response.

第二部分考虑具有阶段结构的非自治扩散捕食系统，利用比较定理得到该系统持久生存的充分条件，其后在概周期情形下通过构造合适的Liapunov函数得到了保证该系统存在唯一一个全局渐近稳定的概周期解的条件。

Based on the analysis of system and system analysis method,the definition,principal content and basic character of gray system analysis method are discussed at full length.

在分析系统及系统分析方法的基础上，详尽讨论了灰色系统分析方法的基本含义、主要内容及其基本特点；分析了求解建筑热湿负荷的国内外现状及建筑热湿负荷的影响因素；指出建筑热湿系统是一非本征灰色系统；并对灰色系统分析方法如何应用于建筑热湿系统提供了思路；最后指出该方法能够得到建筑热湿负荷的满意解

This article uses 32 bits ARM microprocessor as the core to build up an imbedded application system which makes signal detection, Ethernet communication and autodial function integrated. Based on this system this article builds up an Ethernet-based distributed embedded monitor system for the geographically dispersed telecommunication rooms for RMON(which stands for Remote Monitoring)and unified management.

本文以32位ARM微处理器为核心，构建了一种集信号检测、以太网通信和自动派障于一体的嵌入式应用系统，并以此为基础构建了基于以太网的分布式嵌入式监控系统，用于对地域上分散的电信机房进行远程监控，统一管理。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。