复合材料机翼翼梁与蒙皮间应力分析

本文采用三维有限元模式，用“ＡＢＡＱＵＳ”分析程序，进行了复合材料机翼翼梁和蒙皮结构的应力分析，对所获得的缘条和蒙皮之间六个应力分量的分布曲线，与采用二维有限元模式的结果做了对比分析，得出了一些有益的结论。     

机器人适从运动的混合控制

本文研究了理想情形下一类机器人适从运动的混合控制。对于一个机械臂手端与刚性环境发生光滑接触的类型,本文给出了一种约束描述,并进行分析。在此基础上,通过将控制变量分成两个分属于相互垂直的子空间的控制:力控制和运动控制,将机械臂动力学方程分裂成两个。一个用于力控制,另一个用于运动控制。从而对混合控制的思想有了更好的理解,使力控制和运动控制的设计能单独分别进行,为寻找混合控制提供了简便途径。     

一种多串口和以太网转换方法的研究

嵌入式系统中普遍应用RS232串口进行调试通信，但RS232串口在复杂的综合化航电处理平台中的应用却有诸多不便，而通过以太网却无相关问题。鉴于当前大多数成熟应用都需要通过RS232进行通信，设计了一种新型接口模块，实现了将多个RS232串口协议数据转换为以太网协议数据的方法。实践表明，方法能很好地应用在复杂的综合化航电处理环境中，简单方便，不影响用户调试习惯，值得推广应用。     

浅谈降低国内航空复合材料结构成本的途径

从20世纪60年代末至今,先进树脂基复合材料(以下简称复合材料)以其轻质、高强、抗疲劳等优异性能及耐腐蚀、可设计、易于整体成型等特点,在航空领域得到极大的推崇.     

虚拟人力资源及其模式研究

虚拟人力资源是随着虚拟组织出现和知识经济的兴起而产生的新的人力资源的管理方式。近年来,随着信息技术的进一步升级,虚拟人力资源也出现了新的变化和演进。本文讨论了虚拟人力资源的定义,虚拟人力资源产生的理论背景,并较为完整地梳理了包括众包在内的虚拟人力资源的各种模式。     

多核处理器P2020的访存实时性分析与优化

多核处理器以其高集成度、高性能功耗比的特点，获得了军事、电信、网络等领域的关注，但多个处理核心对共享资源的抢占带来的实时性问题阻碍了多核处理器在上述领域的应用。面向实时性的代表指标———访存时间，以P2020为研究对象，分析了其实时性的影响因素，采用可变步长的模型，对各种影响因素进行了定量的测试与分析，为多核处理器访存实时性的优化提供了参考。     

复合材料机翼油箱盖板的制造和质量控制

介绍了采用开模膨胀橡胶法制造带加强筋的复合材料机翼整体油箱油箱盖板的一次共固化的工艺方法.针对初期制造的油箱盖板存在的比较严重的质量问题,包括翘曲、筋条尺寸超差、大面积分层及空隙密集等,提出了相应的设计修改、工艺改进和质量控制措施,最终制造出合格的制件.通过了功能试验和飞行考核.     

流动注射分光光度法测定废水中挥发酚

基于４－氨基安替比林显色原理，采用流动注射技术，建立了炼油废水中挥发酚的快速测定方法，分析速率为４０个试要／ｈ，线性范围为０．７５～２３．０μｇ／ｍｌ苯酚标准溶液连续测定１０次，相对标准偏差为２．８％，对炼油废水样，测定结果与标准方法无显著性差异，获得满意的结果。     

On the association of quiet-time Pi2 pulsations with IMF variations

The association of quiet-time Pi2 pulsations with the variations of the interplanetary magnetic field (IMF) has been examined by using three reported events, occurring during extremely quiet intervals, of which the first was on 10 March 1997, the second 27 December 1997, and the third 11 May 1999. For the first event, the onset time of ground Pi2s maps to the IMF structure bearing a variation cycle of north-to-south and north again as seen by Wind in the upstream region and Geotail in the magnetosheath. Likewise, the second and the third events have respectively, four and three recurrent turnings propagating to the Earth sensed by multiple satellites. The comparison of geomagnetic perturbations, auroral brightenings, and energetic particle data in the magnetotail with the IMF observations shows successive substorm-like activations accompanied by ground Pi2 onsets. For a clear variation cycle, the first Pi2 burst appears 36 ± 8 min after southward turning of the IMF and the second one follows14 ± 4 min after a northward turning. Moreover, ground Pi2 onsets recur under low IMF clock angle conditions. These observational results can be interpreted with the prevailing models of externally triggered substorm. But the solar wind coupling to the magnetosphere under quiet conditions proceeds in a less efficient way than under substorm time conditions. Consequently, we suggest that recurrent quiet-time Pi2s can be associated with IMF variations and their cause can be the same as those for substorm times.     

Simulation study on slant-to-vertical deviation in two dimensional TEC mapping over the ionosphere equatorial anomaly

With the rapid increase of GPS/GNSS receivers being deployed and operated in China, real-time GPS data from nearly a thousand sites are available at the National Center for Space Weather, China Meteorology Administration. However, it is challenging to generate a high-quality regional total electron content (TEC) map with the traditional two-dimensional (2-D) retrieval scheme because a large horizontal gradient has been reported over east–south Asia due to the northern equatorial ionization anomaly. We developed an Ionosphere Data Assimilation Analysis System (IDAAS), which is described in this study, using an International Reference Ionosphere (IRI) model as the background and applying a Kalman filter for updated observations. The IDAAS can reconstruct a three-dimensional ionosphere with the GPS slant TEC. The inverse slant TEC correlates well with observations both for GPS sites involved in the reconstruction and sites that are not involved. Based on the IDAAS, simulations were performed to investigate the deviation relative to the slant-to-vertical conversion (STV). The results indicate that the relative deviation induced by slant-to-vertical conversion may be significant in certain instances, and the deviation varies from 0% to 40% when the elevation decreases from 90° to 15°, while the relative IDAAS deviation is much smaller and varies from −5% to 15% without an elevation dependence. Compared with ‘true TEC’ map derived from the model, there is large difference in STV TEC map but no obvious discrepancy in IDAAS map. Generally, the IDAAS TEC map is much closer to the “true TEC” than is STV TEC map is.