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Meanwhile, it could be seen that there does not exist a confidence interval with width less than 0.5 because of the property of Poisson distribution. Based on these conditions, the author mainly carried out research into two aspects of this problem as follows. Firstly, by numerical and theoretical analysis, the author compares some existent confidence intervals, for example,"exact" confidence interval, Wald confidence interval and Bayesian confidence interval, and finds some deficiencies points of the confidence intervals, whose modification version has been proposed .Also, several better confidence intervals such asare also presented .Secondly, for given confidence coefficient and interval width, the author constructs a class of asymptotical two-stage interval estimate procedures. At the same time, under varies restriction of confidence coefflcientent interval width, the optional sample size of the first stage has been computed by numerical computation. The numerical computation shows that the method considered in this dissertation have good properties and applied value.

同时，由于Poisson分布的特性，我们知道不存在其参数区间长度小于0.5的置信区间，基于这些情况，我们主要展开了以下两个方面的研究：一是利用数值计算分析与理论分析的方法对现有的若干置信区间如"精确"置信区间，Wald置信区间，Bayes置信区间等进行分析比较，发现了一些缺陷，针对这些缺陷，我们进行适当的修正，并得到几种性质较好的置信区间如：修正大样本区间Jeffreys原则下置信区间二是针对已给定的置信系数与区间长度，我们提出了一种渐近的两阶段区间估计程序，并利用数值计算的方法，在各种置信系数与区间长度限定下，算出了最优的第一阶段观测次数，大量数据表明，本文考虑的方法性态良好，具有应用价值。

Based on China' s stylized facts behind foreign trade and a brief review of trade theories in new classicalism, Keynesianism, monetarism and intertemporal approach of current account , a theoretical model is built.

在新古典主义、凯恩斯主义、货币主义和八十年代以后的新古典宏观经济学的带动下，理论界对贸易余额的研究方向也不断发展和完善，尽管这样，仅仅靠这些理论还不足以解释类似中国所经历的贸易顺差问题。

The theoretical analysis and experimental results show that this classifier is noise insensitive and of high learning efficiency.

理论分析和试验表明该分类器学习效率高并具有很强的容噪性能。

In 1966 Smith has proposed the theoretical model of Fault Sealing, since then, many scholars have done a lot of work in estimating and predicting the fault seal in clastic strata, and have made great progress of the study during last 10 years.

从1966年Smith建立断层封闭性理论模型之后，国内外许多学者在评价预测断层封闭性方面做了大量的研究工作，并在近10年取得很大进展，提出了许多有效的定性或定量评价方法。

In this thesis, experimental study, theoretical analysis and numerical simulation are performed to study the conditions, the mechanism and the criterion to the judging of hydrofracturing in clayey core.

本文主要围绕土质心墙堆石坝水力劈裂的发生条件、发生机理和判别标准等进行试验研究、理论分析和数值模拟。

From the point of view of law, rural collective ownership is different from the traditional civil law theory. That how to analyze rural collective ownership by the traditional civil law theory, mold it to become a system rights of clear nature and sound contents is a topic of great theoretical and practical significance.

从法学的角度看，农村集体所有权与传统的民法理论有很大的出入，如何以民法理论来分析农村集体所有权，将其塑造成为一种性质明确、内容完善的权利体系，是一个非常具有理论和实践意义的课题。

Main research contents as follows: The first part: Expounding the important significances and background of the study; summarizing the related research on this aspect; making clear research contents, methods and technical route; introducing the theoretical foundation as well as correlation concepts.

主要研究内容如下：第一部分：阐明本文选题的背景及意义，对文献综述进行评述，说明本文的研究内容、研究方法和技术路线，阐述本文研究的理论基础以及相关概念的界定。

But just as the previous quote remarks that the division between theoretical and experimental scientists is not clearcut, in practice many programming problems require both imperative and declarative aspects.

但是正如前面引用的文字，在实践，理论和实验家之间的划分中体现得并不明显，并且很多地编程问题同时需要命令式和声明式的方法来解决。

In view of their theoretical and practical significant importance in the investigation of sophisticated biological topics, and in the development of novel drugs and new biochemical tools, DNA intercalators and cleavers have received much current interest This dissertation focuses on synthesis of hetrocycles containing naphthalene moiety and on the mechanism of their interactions with DNA.

DNA嵌入、切断剂的研究，对探索生命科学中的复杂问题，发展新药、新型生化工具具有非常重要的理论和实际意义，成为当前多学科的研究热点。本文从我国国情出发，以国内资源丰富的萘类化合物为基点，设计、合成了一系列多杂环平面刚性分子，并对某些化合物与DNA相互作用的分子机理进行了研究。

The theoretical visual angle of native folk in modern novels not only reveals the relationship between native folk, clerisy and national ideology,but also shows that the native folk containing large and scholarly contents takes part in the construction of modern literature rather than passively manifests,it has a notable impact on the development of modern literature.

在现代小说中"乡土民间"这一理论视角不仅揭示了乡土民间、知识分子、国家意识形态三者之间的相互关系，同时也显示了乡土民间不仅仅是被动地被表现，而以其博大精深的内容参与了现代文学的建构，对现代文学的发展有着重要的影响。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。