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Chapter 4 focuses on the study of an age structured SEIRS epidemic model with a vaccination program in varying total population size.

第四章讨论了疾病影响总人口的死亡率和总人口规模变化情况下的年龄结构的SEIRS流行病模型。

D. thesis contains two parts: Part one (contains Chapter 1-Chapter 4) establishes systematically the age-structured SEIR epidemic model, the SEIR model with vertical transmission of disease, the SEIR model with the loss of immunity and an age-dependent vaccination rate, and the SEIRS model with a vaccination program in varying total population size.

本文分两部分：第一部分（含前4章）首次系统地建立了年龄结构的SEIR流行病模型、带垂直传染的SEIR模型、带二次感染和接种疫苗的SEIR模型和总人口规模变化的SEIRS模型。

I learned about serif and sanserif typefaces, about varying the amount of space between differentletter combinations, about what makes great typography great.

我学习写带短截线和不带短截线的印刷字体，根据不同字母组合调整其间距，以及怎样把版式调整得好上加好。

The Japan policy is one of the most important pillars of ROKs foreign policies, which has a varying process of adjustments from hostility to improvement.

对日政策是韩国对外政策的重要支柱之一，韩国的对日政策有一个从敌意到改善的调整变化过程。

RIEMS+ can decrease the transmission failure probability and increase the channel utility factor, because it overcomes the drawback that nodes may have different cognitions on channel status, which arises from the differences in propagation ranges of frames with varying transmission rates.

该协议解决了在不同发送速率条件下，因MAC层帧头的传输范围不同而引起邻节点对信道状态认知产生差异的问题，从而降低了分组发送失败概率和提高了信道利用率。

The ventilation rete doesn′t hold a constant level,and its varying is irregular.

在本研究中，排气量并未始终保持在一个稳定的水平上，其变幅较大且无甚规律可循。

We synthesized a series of porphyrins with varying side-chain lengths and terminating groups, and tried to understand the relationship between the environments and the properties of compound per se through some case studies.

而卟啉类化合物无论是在光合系统的模拟中，还是光疗化合物中都已成为经典化合物。

The automatic voltage regulator is programmed to regulate the transmission bus voltage within a reselected tolerance , despite varying transmission conditions.

自动电压调节器可在事先选定的容限范围内编程调节不同状态的输电母线电压。

The first category involves the development of heuristic techniques which include such ideas as varying the learning rate, using momentum and rescaling variables.

第一类包括使用启发式信息的技术，这些启发式技术包括可变的学习速度，使用动量和改变比例变量等。

With the varying of the temperature, the repulsions of two out-of phase solitons are increasing.

将两束相干光束作为入射波，在不同温度下采用数值方法求解波传播方程。

Vishnu entered a dark fourth dimensional dream that did not support his field or continued life.

毗瑟挐进入了一个第四密度的黑暗梦想，那里并不支持他的能量场或继续生命。

Leaders and decision-making persons use it to collect the data, including the information of unit work, handing in fee, oweing fee, prepaying fee,changing and afterpaying and account transfering of joining-insurance employee, and account paying of all kinds of insurances from hospitalization insurance institutions.The collected data is picked up, organized, switched and showed to user.

该子系统主要面向各级领导、决策分析人员；从各个医疗保险经办机构和定点医疗机构采集数据，包括在各个医疗保险经办机构处理的单位办公信息，单位缴费、欠费、预缴费信息，参保职工变更信息，参保职工增减变动信息，参保职工补缴信息，参保职工帐户划拨信息：包括各定点医疗机构处理的各险种帐户支出信息，各险种的统筹金支付信息等；将采集的数据提取，组织和转换，然后展示给用户。