时滞

Precise control of negative pressure is of great significance in the agglomerative production. Aiming at time-delay and large overcontrol problem, the paper designs a pressure online monitoring and control system based on C8051F410 Micro Controller Unit.

负压的精确控制在烧结生产中有重要意义，针对烧结过程中存在的时滞和大超调问题，设计了一个基于C8051F410单片机的负压在线监控统。

Asymptotical and numerical solutions are obtained. The total number of the patients in Beijing is simulated.

得出了该时滞微分方程的渐近解和数值解，并对北京市SARS 疫情中的累计患病人数进行了模拟。

Asymptotical stability of linear switched neutral delay systems is considered.

提出了切换中立时滞系统的概念并研究了渐近稳定性问题。

The sufficient conditions for persistence and global attractivity of peridic solutions are obtained by means of using differential inequality and constructing suitable Lyapunov function.

研究了一类扩散具有时滞的非自治捕食系统的持久生存与周期解问题，利用微分不等式和L iapunov泛函的方法得到了该系统持久生存与周期解全局吸引的充分条件。

In chapter 2, we introduce a generalized harvesting model, which is belong to piecewise continuous argument delay equations, we present sufficient condition to ensure the global attractivity of unique positive equilibrium and explore the possibility of emerging complex behavior-chaos.

研究了其正平衡解的全局吸引性，和可能出现的复杂动力学行为－－混沌；利用概周期序列的概念研究了分段连续时滞的微分方程的概周期解的存在性。

From both positive and negative perspectives, the author probes into the phenomenon of "regulation lag" and the issue of how to establish the contestable structure in a natural monopoly market.

同时，文章从正反两方面分析了&管制时滞&现象和如何在公用事业行业中建立竞争性市场结构的问题并且对公用事业中自然垄断业务、具有竞争潜力的业务、市场结构类型和相应管制方法进行了理论描写并且对上述理论的正当性和不足之处进行了分析和评价。

In this paper, taking one 1900t/h supercritical pressure once—through boiler installed in East boiler company as subject investigated, analyzing the structure and characteristic of unit, from the mechanism of units, based on the law of quality conservation, energy conservation and momentum conservation, having Lagrange fluid particle tracing idea in hydrodynamics field application in analyzing of unit operational characteristic, author build up the nonlinear distributed parameter general dynamic mathematical model of single-phase heating surface or diphase heating surface in the steam-water system for supercritical pressure once—through boiler, which is suitable numerical calculation and simulation for large scale disturbance and full working conditions change, and enough materializing distributed characteristic of thermodynamic parameter in process and time lag characteristic of energy transportation in tache. The transient responses curve of the system main variables under several disturbance are computed by Computer Simulation for the model, and theoretical analysis shows that the simulation results are reasonable.

本文以东方锅炉集团公司的一台1900 t /h超临界压力直流锅炉为研究对象，在分析机组结构和特性的基础上，从机组的工作机理出发，以质量、能量、动量守恒定律为依据，将流体力学领域中的Lagrange流体质点追踪思想用于机组运行特性的分析上，建立了适用于超临界压力直流锅炉汽水系统单相、双相受热面的非线性分布参数通用动态数学模型，该模型适合于大扰动全工况变化的数值仿真计算，充分体现了过程热力参数的分布特性和环节中能量输送过程的时滞特性，并对模型通过计算机仿真得出各种扰动下系统主要变量的响应曲线，从理论上分析了仿真结果的合理性。

The dynamic characteristics of negative stiffness Duffing system with delayed feedback control are investigated.

对时滞反馈控制负刚度Duffing系统的动力学特性进行了研究。

The time lag of Chinese course is that there is a relative lag between the development of Chinese course and request of times. Such lag is decided by hominine factor, external environment and idiosyncrasy of Chinese course.

语文课程的时滞是指语文课程的发展相对于时代的需求而言是相对滞后的，这种滞后性是由于人为因素、客观环境以及语文课程自身特征共同决定的。

This paper studies the exponential stability of cellular neural networks with time- varying delay by making use of the homoeomorphism theory, the idea of vector Lyapunov function, M- matrix theory and inequality - technique, offering the grounds for uniqueness of equilibrium point existence and the global exponential stability and estimating the exponential convergence rate index.

利用同胚映射理论、向量Lyapunov函数思想、M-矩阵理论和不等式技术，研究了具有变时滞的细胞神经网络模型的全局指数稳定性，给出了判定平衡点的存在唯一性以及全局指数稳定性的一个判据，并且估计了收敛速度指标。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。