Orbital steady motions of a system of two bodies with an elastic connection

Steady motions of a pair of mass points connected by a rigid rod were studied by Abrarova and Karapetyan [1], the motions of a pair of mass points connected by an elastic spring were considered by Burov and Stepanov [2]. The present article is devoted to the existence, stability and bifurcation of the steady motions for a system composed of two bodies connected by an elastic torsional spring. Each of these bodies is a massless bar with mass points at the ends. One supposes that these bars are elastically connected and the system moves in the plane of the orbit of its mass centre. The trivial steady motions are studied (the principal axes of inertia of the system are directed as the radius-vector of the centre of inertia and as the tangent to the orbit). The non-trivial steady motions (the principal axes of inertia of the system are not directed as the radius vector or as the tangent to the orbit and the bars are not orthogonal each other) are also studied. We expose the complete study of the stability and of the bifurcation diagrams.     

二进制乘法器的面—时平方复杂性研究

讨论了n位二进制整数乘法下界面－时平方复杂性问题，给出了一种树型布局的乘法器网络模型，并分析了它的AT~2复杂性     

防代理技术在校园网中的应用

本文分析了某大学校园网网络现状以及网络存在的问题,针对用户大量代理上网导致网速慢的问题,进行了深入的分析,提出了利用限制用户连接数的方法解决代理问题的方案,介绍了防代理技术的原理和具体实施步骤,并对该方案的落实情况和应用效果进行了比较分析,为网络代理问题的解决提供了一个新的思路。     

半球谐振陀螺精密集成组装技术探讨

半球谐振陀螺零件制造的高精度和对称性是保障产品性能指标的关键,当前制造技术的短板是制约半球谐振陀螺性能指标提升、高合格率和低成本制造,以及批量生产的主要原因之一,集成组装是半球谐振陀螺制造过程的关键环节。因此提出了面向半球谐振陀螺装配的"六心一线"目标,即半球谐振子几何球心、质量中心、谐振中心、激励罩的激励电极中心、读出基座输出检测中心以及形成的静电场中心必须做到同心、同轴,探讨了保证"六心一线"的集成装调技术,为保障半球谐振陀螺的装配精度、性能和装配合格率提供技术支持。     

高职教育办学特色的构建与实施

详细介绍了西安航专高职教育办学特色的理论基点和实践历程，分析了西安航专办学特色和做法，重点从明确服务面向、构建合作平台、建设实训基地、开展“订单”培养、实施能力本位和解决企业难题实现互动双赢这六个方面总结了西安航专校企合作开展人才培养的具体做法和取得的显著效果。     

浅谈混凝土外墙单面网聚苯板外保温施工及质量控制

本文通过对石家庄某住宅聚苯板与墙体一次浇注成型施工质量的监理过程的阐述,介绍该工艺的流程及特点,探讨其在今后工程中的应用。     

An Investigation of Near-Equatorial Geomagnetic Pi2 Pulsations

There is understanding to date that Pi2 pulsations have two sources. One source is a high-latitude one and is due to fluctuations of electrojet parameters. The other source is a mid-latitude one and is driven by a global mode excited in the Earths plasmasphere. There is experimental evidence that in the near-equatorial regions the character of Pi2 excitation is different from high and mid-latitudes. In this connection, we investigated the amplitude-spectral-polarization characteristics of Pi2 pulsations using the date from near-equatorial Chinese stations. The detected regularities in the excitation of near-equatorial Pi2 pulsations are used in the discussion of the possible physical mechanism that is responsible for the generation of these pulsations.     

基于CAXA V2的二维参数化标准件图库创建与使用

围绕CAXA标准件图库的二次开发,介绍了基于CAXA V2的二维参数化标准件图库的结构、特点、创建过程和使用方法.     

基于局域网的智能家庭网关

为了实现小区的智能化管理，以提高小区管理人员的工作效率和管理水平及小区居民的生活质量，提出了一种基于嵌入式网关的智能家庭网关，采用智能家庭网关并结合以太网技术而构建的小区智能管理系统，实现了对小区家庭的防火、防盗、煤气泄漏、紧急求助报警，水电气三表远程自动抄收，家电远程控制等功能。是真正意义上的网络化、智能化的家庭控制系统。     

串联密封系统泄漏率的测定

从理论上讨论了用常规氦质谱仪检漏方法测定两密封件串联密封的气路系统各密封件“单密封”泄漏率的问题。给出了解析结果， 所得出的结论应用在工程实践中有利于提高产品质量， 具有经济价值。