时滞

In Section 4.1 and Section 4.2, delay SEIR and SEIRS epidemic disease models with vertical transmission and pulse vaccination are discussed, respectively.

第一节和第二节分别讨论了具有垂直传染和脉冲免疫的时滞SEIR及SEIRS传染病模型。

Based on ODEs and FDEs, some definitions about the stability of delayed differential inclusions are introduced.

这些结果是常微分方程、泛函微分方程以及微分包含稳定性理论的推广和完善，在某种意义下填补了时滞微分包含稳定性理论的一些空白。

The motivations, notations and outline of this work are also given in this chapter.

从这个意义上讲，这些时滞是无害的。然后用实例说明这三个定理的应用和互不包含性。

In the fourth chapter, an SIQR model with the delay corresponding to the quarantine period is consided. The threshold and the stability conditions are obtained, the conditions under which periodic solution occurs are obtained.

第四章，考虑了含有相应于隔离期时滞的SIQR模型，确定了各类平衡点存在的阈值和稳定性结论，分析了系统周期解存在的条件。

Using this theorem, we proved the existence of traveling wave solutions in cooperative Lotka-Voterra system with stage structure.

本文用这个存在性定理证明了带时滞分年龄段的Lotka-Volterra模型的两个平衡点之间行波解的存在性。

On condition that the nonlinear uncertain functions are gain bounded, a sufficient condition, which is dependent on the maximum value of the time derivative of time-varying delay, is presented for the existence of the controller.

在非线性不确定性满足增益有界条件下，得到了该类时变时滞系统依赖於时变延迟导数的最大值的满足鲁棒性能的一个充分条件。

A model for predicting the sulphur content in hot metal based on neural networks is introduced. Blast temperature, blast flux, top temperature, burden, coal injection rate, sulphur content in ore, sulphur content in coke, sulphur content in coal and silicon content of last tap were selected as inputs. The inputs were treated with time lag to improve prediction.

采用3层BP神经网络来预报高炉铁水硫含量，根据高炉冶炼的实际生产数据，选取风温、风量、炉顶温度、焦炭负荷、喷煤量、矿石硫含量、焦炭硫含量、煤粉硫含量和上一炉铁水硅含量9个因素作为输入变量，为提高神经网络预报的准确率，对输入参数进行时滞处理。

The problem of identification and control for processes with time-delay is always encountered in industry.

时滞系统的辨识与控制是工业上经常遇到的问题。

Furthermore, due to the possible discontinuities of the activations functions, we introduce a suitable notation of limit to study the convergence of the output of the delayed neural networks.

此外，由于激励函数的不连续性，我们介绍了一个适当的极限记号来研究时滞神经网络输出的收敛性。我们的结论推广了相关文献的结果。

In this thesis, by the theory of bifurcations and chaos, we at first investigate bifurcations and chaos of a delayed ecological model.

本文首先应用非线性动力系统中的分岔和混沌理论，研究一个时滞生态模型的分岔与混沌，提出并改进了原有结果。

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。