其要内容如下：第一章绪论，主要介绍论文研究意义、目的、态度、方法。
The first chapter is the preface which is about the significance, intention, attitude and method of this paper.
第一章绪论，主要介绍了国内外对信用风险的研究现状及本文的研究思路。
The fist chapter is introduction and introduces the research on credit risk in and out of our country, and the research route.
本文包括五个部分，第一章绪论简单介绍约瑟夫森结的构造、基本性质以及国内外对约瑟夫森器件的研究现状。
In chapter one I give a simple overview of the history and realism of research on Josephson junction and present some basic properties of Josephson junctions.
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