Research of Optical Fiber Coil Winding Model Based on Large-deformation Theory of Elasticity and Its Application

Optical fiber coil winding model is used to guide proper and high precision coil winding for fiber optic gyroscope (FOG) application. Based on the large-deformation theory of elasticity, stress analysis of optical fiber free end has been made and balance equation of infinitesimal fiber is deduced, then deformation equation is derived by substituting terminal conditions. On condition that only axial tensile force exists, approximate curve equation has been built in small angle deformation scope. The comparison of tangent point longitudinal coordinate result between theory and approximation gives constant of integration, and expression with tangent point as origin of coordinate is readjusted. Analyzing the winding parameters of an example, it is clear that the horizontal distance from the highest point of wheel to fiber tangent point has millimeter order of magnitude and significant difference with fiber tension variation, and maintains invariant when wheel radius changes. The height of tension and accurate position of tangent point are defined for proper fiber guide. For application to fiber optic gyroscope, spiral-disc winding method and nonideal deformation of straddle section are analyzed, and then spiral-disc quadrupole pattern winding method has been introduced and realized by winding system. The winding results approve that the winding model is applicable.     

债转股问题初探

债转股作为经济体制改革的一个重要探索，已经成为当今法学界和经济学界讨论的主题。作为一个新事物的出现，债转股必然会遇到一系列来自不同方向的阻碍，本文就这些困惑进行论述，阐明了债转股面临的主要问题，并提出相应的解决方案和建议。国民经济体制改革需要大胆的探索和创新，债转股就是一个很好的范例，尽管其实施过程中难免遇到一些难题，但必将取得骄人的成果。     

助人自助——心理咨询的真谛

心理咨询的真谛是助人自助，即唤起来访者的自助意识，引导他们通过自我领悟、转换视角、重拾自信及保持平衡等手段从无助走向自助。     

提高大学生读写能力之策略

本文着重论述了加强语言基础训练和培养语篇阅读能力是提高大学生读写能力的有效途径。指出两者是相互促进、相辅相成的的关系。同时，就如何提高大学生的读写能力提出了一些方法和策略。     

Space Science & Technology in China: A Roadmap to 2050

<正>In October 2007, the Chinese Academy of Sciences (CAS) initiated a project entitled "Roadmapfor Strategic Research in Key Fields of Science and Technology in China through 2050". The project was     

WE-C2001全方位加工中心为用户提供最优性价比

斯达拉格海科特公司的中型加工中心HEC 500运动型、HEC 630运动型及HEC 800运动型,系列加工中心的托盘尺寸从500mm×500mm到1000mm×800mm,能够满足市场对切削功率不断增加,对停机时间和生产成本不断降低的需求.     

Danobat立式车削加工中心VTC

Danobat自1954年以来一直制造各种卧式和立式车床,为汽车、航空航天、转包生产、发电等行业提供了许多机床. Danobat开发的所有项目都与客户进行了密切合作,以便推荐给他们正确的解决方案,并总是考虑到如何提高生产效率和降低成本.     

BEST APPROXIMATION BY NORMAL MATRICES WITH SPECTRAL CONSTRAINTS

考虑在给定谱约束和Ｆｒｏｂｅｎｉｕｓ范数意义下用正规矩阵最佳逼近一个给定复方阵的问题。给出了这个问题可解的充分必要条件,提出了求解这个问题的一个数值算法,并给出了一个数值例子。     

基于主动刚度设计法的机翼结构刚心匹配设计

基于主动刚度设计的理念,提出了以扭转力矩为目标函数,利用优化手段对机翼刚心线进行设计的方法,以期满足飞机初期阶段设计刚度的要求。以大展弦比机翼为算例,对刚心线优化方法进行了验证,得到匹配载荷的刚心线,并将优化结果与工程实际进行了比较,结果表明,该优化方法是一种科学合理的刚心线计算方法。刚心线位置的确定为后期机翼的刚度分析设计、甚至优化提供了支持。