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This paper summarizes the domestic and overseas study status and developing direction of cam. On basis of the problem that the idler wheel which is the driven part of the cam machine in CT36-110 spring operating mechanism is destroyed easily, the author get much fact material through inner research, and presents a optimal design imagine of disc cam. Through enough compare and argumentation, this paper presents the optimal design model of the disc cam.

本论文阐述了目前国内外对凸轮的研究状况、发展动态和发展方向，根据云南开关厂CT36-110型弹簧操动机构中盘形凸轮机构的从动件——滚轮易损坏的生产实际，深入调查研究，在掌握大量生产应用实际资料的基础上，提出了对盘彤凸轮进行优化设计的思想，并在充分比较和论证的基础上提出了盘形凸轮的优化数学模型。

This occurs in physics, chemistry, material research, genetics, and immunology almost every day.

这在物理学、化学、材料研究、遗传学、免疫学中几乎是每天发生的事。

Beijing Liujian Construction Corporation, Beijing 100039,China;3.China Academy of Building Research,Beijing 100013,China The compound organic thermal insulating material used in outer-wall external thermal insulation has become the importable fire source.

本文在对外保温火灾发生的阶段和原因进行简要分析的基础上，对近期典型的火灾案例按火灾发生不同时段进行分类选编，所有案例均涉及外墙保温所用的有机保温材料。

The innovations of new materials and new technology will become the most influentially strategic research field of society development, economic promote and national power enhance in the future 10 years, and nanometer material will become to be one of the most important materials.

新材料的创新，以及在此基础上诱发的新技术是未来10年对社会发展、经济振兴、国力增强最有影响力的战略研究领域，纳米材料将是起重要作用的关键材料之一。

Hence, the research of new process, new structure and new material for interconnect are becoming more and more active and important.

为此，互连线新工艺、新结构和新材料的研究逐渐成为热点，也越发重要。

Finally, the future of noise active control is proposed, that is design theory and method of sound interdict strap, active sound absorption and research of new absorption material.

最后，提出噪声控制工程的未来发展方向，即：声学禁带设计理论与方法，主动吸声，新型吸声材料的研究。

At the end of this article, the author has made a material expatiation about how to actualize and to push the intramural teaching and research in the multiple community.

最后，在复合型共同体中，就如何有效实施和推进校本教研作了具体的阐述。

Material research and ion for new products.

新产品的材料研发及选择。

We try to find the right welding material, and welding technics for carbon dioxide gas protecting welding and SMAW, we also research on welding deformation, structure and mechanical property of the joint, and sensitivity for lamella tearing of the base metal.

研究二氧化碳气体保护焊和焊条电弧焊这两种不同焊接方法的焊接工艺和焊接变形，焊接接头的组织及力学性能，母材的层状撕裂敏感性等。

Laser cooling of solid material has become a new developing research area in recent years.

固体材料的激光制冷是近年来发展起来的一个新的研究领域。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐