圆形载流线圈沿一直径折成直角可看作磁偶极子

从磁偶极子的特点出发,用毕奥—萨伐尔定律、安培力公式和力矩的定义,推导出用磁矩表示的圆形载流线圈沿一直径折成直角的远场及其在均匀磁场中所受的磁力和磁力矩,指出此非平面载流线圈可看作磁偶极子.     

Boundary-Work in the Health Research Field: Biomedical and Clinician Scientists’ Perceptions of Social Science Research

Funding agencies in Canada are attempting to break down the organizational boundaries between disciplines to promote interdisciplinary research and foster the integration of the social sciences into the health research field. This paper explores the extent to which biomedical and clinician scientists’ perceptions of social science research operate as a cultural boundary to the inclusion of social scientists into this field. Results indicated that cultural boundaries may impede social scientists’ entry into the health research field through three modalities: (1) biomedical and clinician scientists’ unfavourable and ambivalent posture towards social science research; (2) their opposition to a resource increase for the social sciences; and (3) clinician scientists procedural assessment criteria for social science. The paper also discusses the merits and limitations of Tom Gieryn’s concept of boundary-work for studying social dynamics within the field of science.

重力场的时间变化与地球动力学

利用现代高精度重力场信息研究地球动力学问题是近年来国际地学领域前沿热点,除地震测量外,重力场为人们准确了解和深刻认识地球深内部构造提供又一有效工具。文章简要概述了利用超导重力仪开展重力场研究的背景和作用,介绍了国际发展现状和趋势以及我院近年来在知识创新工程重要方向性项目的支持下取得的主要研究成果,最后对如何进一步发挥重力场在地球动力学和国家需求方面的作用提出了几点建议。     

分子印迹技术及其在环境领域的应用

分子印迹是近十年发展起来的新技术,本文阐述了分子印迹技术的原理与分子印迹聚合物的制备方法,介绍了该技术在环境领域中的若干应用,提出了分子印迹技术将为环境领域的科学研究开辟一条新路等观点。     

半导体制冷的圆柱体三维传热模型及仿真

考虑热源和外部环境对圆柱体三维传热模型和温度场分布的影响,建立了基于半导体制冷的圆柱体三维传热模型,利用变量分离法和拉普拉斯变换法,导出了其三维温度场的封闭解析解．通过数值计算和编程仿真,给出相应的仿真结果,分析了半导体制冷片的位置变化对圆柱体三维温度场的影响特性．为进一步分析圆柱体三维温度场及其应用提供理论依据．     

聚合物取向结晶形态观察实验设计

利用偏光显微镜观察聚合物结晶形态是经典的高分子物理实验之一,是高分子专业学生必须掌握的一门实验技术.但大部分高校开设的偏光显微镜观察聚合物结晶形态实验是基于聚合物球晶观察,方法简单但相对枯燥.该实验在原有基础上引入温度梯度热台,学生不仅能观察到恒温状态下的球晶形貌,也能观察到温度梯度下的取向结晶形貌.学生可以自行设置不...     

语文教学场论

宇宙是一个全息，全息形态的形成靠场来实现。语文教学是一个全息子场，它由教师场、学生场、教学媒体场、教学情境场组成，它们之间的相互作用靠场来实现，在语文教学中，一要注重场力的充分发挥，充分民掘各场的场能；二要提高场力内化的能力，疏通场力通道，激活各场内在张力；三要注意场的层级性，寻找教师、学生、教学媒体场的最佳交汇点，以产生强烈的场共震效应。在语文教学理论实施中应遵循：整体性原则，开放性原则，发展性原则，层次性原则，情感性原则，实践性原则，选择性原则。     

四元数体上矩阵的对角化和Schur定理

定义了友向量的概念 ,给出了四元数矩阵可对角化的立分必要条件以及对角化的一种方法 ,证明了四元数矩阵的Schur定理     

长枞水电大坝的热弹性与渗漏分析

This paper deals with the temperature and displacement fields of the top mid-block of south transition at Long Spruce Generating Station, in the North of Manitoba, Canada. According to the experimental results of Manitoba Hydro in the past two years, the top mid-block is assumed to be a rectangular one that has two supposed temperature distributions at its boundary sides. Then, the temperature fields for the top mid-block are obtained from the analytical solutions by separation of variables. By using the analytical solution of temperature field, the displacement behavior of the top block in various temperature fields is discussed in details. The numerical results are given to show the causes of the leakage between the top mid-block and the dam. Finally, the repair methods for leakage are discussed for practical leaking repair and its engineering applications.     

花生田蛴螬可持续控制技术研究--以新乡市花生田为例

花生是新乡市重要的经济作物之一,近几年,由于蛴螬危害严重,造成大面积减产。通过研究和试验示范,总结出一套花生田蛴螬可持续控制技术措施,可有效控制蛴螬的危害。