蚕豆种子的标准发芽率,电导率,活力指数与田间质量表现的关系

对贮藏１、２、３年的蚕豆种子进行了４８、９６小时的老化处理，相继测定了各种理种子的标准发芽率、电导率、活力指数、田间出苗率和株高等质量指标，并做了室内质量与田间表现的相关性分析。结果表明：批间发芽率在老化４８小时差异不显著而老化９６小时差异极显著（Ｐ〈０．０１）；种批间的电导率、活力指数在老化４８与９６小时后均差异极显著（Ｐ〈０．０１）。老化前和老化４８小时种批的田间质量表现无显著差异，而老化９６     

高职电工、电子课程改革的研究与实践项目总结报告

高职各专业开设的电工、电子课程是一门理论性、技术性、应用性很强的专业基础课.本文从培养生产、管理、服务一线需要的高级技能型人才这一高等职业教育总体培养目标出发,提出了电工、电子课程教学内容体系改革的总体思路.     

影响酸强度的结构因子探讨

影响酸强度的结构因素有多种，本文分析了各种因素对酸电离过程或酸强度的作用机理。     

160km/h直流传动内燃动车辅助变流柜

本文详细介绍了160km/h AC-DC内燃动车组辅助变流柜的电气原理、工作原理、性能参数以及结构组成。     

控制线路排故方法及其在教学中的应用

根据在教学实践中总结的规律，分析了电气设备故障的查找和排除和对学生接线过程中出现在错误点的查找。总结了故障点查找的快速易行的方法。     

电子文件档案化管理的影响及对策

随着先进的技术和管理方式产生了大量的电子文件,电子文件应适应现代管理制度和信息社会的发展,采取先进的技术和理念,以虚拟、开放、灵活的手段来管理电子文件档案,以确保电子文件档案化管理工作顺利开展,为电子文件档案信息资源共享做出应有的贡献.     

常用低压电器元件的简介、选用与维修

低压电器是电气控制中的基本组成元件,对常用电器元件工作原理的了解有利于工程自动化的完成,并且也有利于电器维修。     

What's nu? A re-examination of Maxwell's ‘ratio-of-units’ argument,from the mechanical theory of the electromagnetic field to ‘On the elementary relations between electrical measurements’

This re-examination of the earliest version of Maxwell's most important argument for the electromagnetic theory of light—the equality between the speed of wave propagation in the electromagnetic ether and the ratio of electrostatic to electromagnetic measures of electrical quantity—establishes unforeseen connections between Maxwell's theoretical electrical metrology and his mechanical theory of the electromagnetic field. Electrical metrology was not neutral with respect to field-theoretic versus action-at-a-distance conceptions of electro-magnetic interaction. Mutual accommodation between these conceptions was reached by Maxwell on the British Association for the Advancement of Science (BAAS) Committee on Electrical Standards by exploiting the measurement of the medium parameters—electric inductive capacity and magnetic permeability—on an arbitrary scale. While he always worked within this constraint in developing the ‘ratio-of-units’ argument mathematically, I maintain that Maxwell came to conceive of the ratio ‘as a velocity’ by treating the medium parameters as physical quantities that could be measured absolutely, which was only possible via the correspondences between electrical and mechanical quantities established in the mechanical theory. I thereby correct two closely-related misconceptions of the ratio-of-units argument—the counterintuitive but widespread notion that the ratio is naturally a speed, and the supposition that Maxwell either inferred or proved this from its dimensional formula.     

高密度电法探测煤火的正演模拟研究

通过建立煤火的地电模型,采用有限差分法分别对温纳装置进行正演模拟,得到模型的视电阻率断面数据。在对数据加入5%噪声后反演得到视电阻率拟断面图。反演结果表明:火区燃烧中心、烧空区和松散冒落带在反演视电阻率拟断面图上均反映出了异常且与模型相吻合。验证了高密度电法探测煤火的有效性和准确性。因此,高密度电法以其高精度、大信息量的优势,在煤火探测领域必将取得很好的效果。     

无线电能供给系统的设计与实验研究

首先介绍了无线电能传输系统的原理和系统的构成,然后设计了白炽灯和摄像系统的无线电能供给系统,最后对系统进行了实验研究,结果表明了该无线电能传输系统设计是可行的、高效的.