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In this paper, a disease transmission model of SEIRS type with exponential demographic structure is studied. Two sufficient conditions are obtained to guarantee the local or global exponential stability of the disease free equilibrium by using a new technique based on the concept of comparison.

本文研究了一类具指数人口统计与结构的SEIRS传染病模型，利用一种新的基于比较原理的分析，获得了无病平衡点局部和全局指数稳定的两个充分条件。

This study develops a whole new aspect of contingent-claim model for hedging the catastrophe risk. We describe the framework of the new hedging strategy - catastrophe swap - as detail as possible and compute the exchange amount of CAT swap contract by Monte Carlo Simulation. Last but not least, this article reveals the most powerful back-up, net cash flow and utility comparison between different strategies, to prove the practicability and favorableness of our catastrophe swap model.

本篇论文将设计一个跨期性理赔的避险模型来处理巨灾风险，於后文将会仔细地介绍这个全新的避险策略「巨灾交换契约」其模型的建构概念以及方式，并由蒙地卡罗模拟法计算出所需的交换数额，最后，针对三种不同的巨灾风险处理来进行数值分析，藉由比较其「净现金流量」和「期望效用」来验证该巨灾交换契约模型的可行性与有利性。

Furthermore, as stresses in the stress field influence the value of seepage coefficient k, which will results in the change of seepage field in the end, while on the other hand, the seepage field also has an effect on the stress field because of seepage forces. Based on the coupling model of seepage field and stress field, a program by finite element method is developed in this paper. And the comparison of results of the program and criterion method with that of test shows that the test results are reasonable, which can be referred to analyze the causes of dangers, evaluate degree of safety of the body and foundation, and design and optimize the measures of seepage control.

此外，考虑到应力场中的应力会改变土体渗透系数进而影响渗流场、而渗流场也因其产生的渗透力会导致应力场发生变化，两者之间存在耦合作用，本文基于渗流场应力场耦合分析的数学模型编制了渗流计算有限元程序CCOSAS1.0，其计算结果和采用规范方法所获得的解答与实测值的对比分析表明，该规律合理且具有一定的代表性，可用以分析险情发生原因、评价堤身堤基安全状况及设计与优化渗流控制措施。

The Mental Health Test and the Profile of Mood State were used to research the effects of Chinese traditional folk exercise training on the state of mind and its relation with mental health by the method of experiment and comparison.

通过实验比较的方法，使用心境状态量表和心理健康诊断等研究工具，目的在于研究民间传统体育锻炼对心境状态的影响及其与心理健康之间的关系。

For comparison, the researchers gae similar questionnaires to parents of 928 babies the same age who were not affected by the bacteria.

作为对照，研究者对相同年龄未被细菌感染的928名婴儿的父母做了类似的问卷调查。

JDS-1 Interferometer is applicable for measurement of 3-4 grade gauge blocks or precision sizes up to 150 mm by high-precision comparison with a higher grade of gauge block or a standard reference component.

本仪器是一种采用量块或标准零件借以高精度的比较方式的立式精密长度计量仪器。

Based on the fundamental theory of impulsive differential systems, employing Green formula, Gauss divergence theorem, Jensen inequality and Gronwall-Bellman inequality with impulse, we discuss the oscillation of impulsive partial differential systems by adopting reduction to absurdity and the stability in via of comparison theorem, respectively. Especially, we take an in-depth study on the oscillation of neutral impulsive parabolic systems and the stability of a class of nonlinear impulsive partial differential equations and obtain some useful conclusions.

本学位论文以脉冲微分系统基本理论为基础，利用反证法的分析方法和比较定理，结合Green公式、Gauss散度定理、Jensen不等式、含脉冲的Gronwall-Bellman不等式以及相关数学工具研究了脉冲偏微分系统的振动理论和稳定性理论，特别对中立型脉冲时滞抛物系统的振动性和一类非线性脉冲偏微分系统的稳定性作了较为深入的研究，给出了一些有用的结论。

Based on the data of aerosol chemical compositions obtained at WMO GAW(World Meteorological Organization Global Atmospheric Watch) station in eastern China——Lin'an regional background air pollution monitoring station,two methods(referred as Malm method and Stelson method) that were described by Malm and Stelson were used to study the mass closure of sampled aerosols.The inter-comparison of reconstructed aerosol masses with the gravimetric masses showed good agreements,although the tw...

通过在WMO GAW区域大气本底污染监测站——临安大气本底污染监测站采集的气溶胶样品的化学成分的分析结果，分别用Malm(1994)和Stelson(1981)提出的方法(分别记为Malm方法和Stelson方法)重建气溶胶质量浓度，并与称重获得的质量浓度进行对比，发现虽然Stelson方法和Malm方法所考虑的物质组成及所使用的化学成分个数并不相同，其计算结果略有差异，但总的来说2种方法都能较好的反映绝大部分的气溶胶质量，在实际应用中可以根据所分析的化学成分数据情况和研究的目的采用不同的质量重建方法。

A detailed comparison allows us to affirm that Gluck could replace Rameau on the French stage only by assimilating the latter's beautiful works and making them his own.

详细的比较允许我们肯定Gluck在法国阶段可能通过同化后者美好的工作和做他们他自己仅替换Rameau。

Theoretical analysis and comparison between computational results and experiments show that crossflow diffusion caused by grid lines is the most important error and grid line justification is the effective way to decrease crossflow diffusion.

理论分析和数值与实验间的比较结果表明，由于网格线的不合理布置导致的伪扩散误差是切向燃烧流场模拟中的主要误差。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。