CPCI总线视频采集卡的应用设计

基于Philips公司的一体化芯片SAA7130HL,提出一种以其为核心的CPCI接口视频采集卡的设计方法。此视频采集卡采用8块一体化芯片SAA7130HL,通过PCI-to-PCI桥芯片PCI2050BI扩展成8路设备,实现了8路视频采集,可在恶劣条件下工作。     

一种2050铝锂合金薄板的微观组织与力学性能

通过力学性能测试和微观组织观察研究了不同热处理工艺对一种2050铝锂合金薄板力学性能和组织结构的影响。结果表明:2050铝锂合金主要强化析出相为T1相和θ′相,并可能存在少量S′相析出。在T6态(175℃)、T8态(6%预变形+155℃)时效时合金具有不同的时效析出特征;相比于T6态时效,由于时效前预变形的引入,T8态时效时合金中T1相和θ′相析出密度提高,尺寸减小,其对应的强度及延伸率均提高,T8峰时效(32 h)时σ_b、σ_(0.2)和δ分别为531MPa、488 MPa和11.4%。T8态时效(155℃/32 h)时,2%~10%预变形均可促进T1相形核,2%~6%预变形可促进θ′相形核,过大的预变形(如10%)并不能促进θ′相进一步形核,但可显著抑制θ′相长大。     

预拉伸变形量对2050铝锂合金组织和性能的影响

通过拉伸试验、晶间腐蚀试验以及透射电镜(TEM)等方法对固溶处理后不同预拉伸变形量处理并人工时效后2050铝锂合金厚板室温拉伸性能、抗晶间腐蚀性能以及合金的微观组织形貌进行了研究。结果表明,随预拉伸变形量的增加,合金L向和LT向的屈服强度和抗拉强度逐渐增大,变形量＞4.0%后趋于平稳,伸长率逐渐降低后趋于稳定;随预拉伸变形量增加,腐蚀形貌由晶间腐蚀变为点蚀,点蚀深度逐渐减小。预拉伸变形促进了人工时效过程中晶内T₁相的弥散析出,降低了晶界处T₁相含量,因此提高了合金的强度和抗晶间腐蚀性能。预拉伸变形量为5.0%时,合金的强度和抗晶间腐蚀性能最佳。     

黄河中下游天然年径流变化趋势预测

基于神经网络理论与传统分析方法,采用改进的BP网络算法,利用黄河陕县水文站531 a天然年径流时间序列,建立了黄河中下游年径流长期变化的BP网络预测模型,并以此模型对2001—2050年黄河中下游天然年径流变化趋势进行了预测分析,结果表明:①中下游天然年径流在未来50 a变化的大趋势是丰水时段比枯水时段略占优势,要经历2001—2020年相对丰水时段、2021—2026年相对枯水时段、2027—2037年相对丰水时段及2038—2050年相对枯水时段;②黄河中下游与上游的天然年径流变化的大趋势基本一致,但中下游出现连续枯水时段的时间较上游长。     

A post-2020 EU energy technology policy: Revisiting the strategic energy technology plan

With the European Strategic Energy Technology Plan (SET Plan) expiring in 2020, the EU needs to revisit its energy technology policy for the post-2020 horizon and to establish a policy framework that fosters the achievement of ambitious EU commitments for decarbonization by 2050. We discuss options for a post-2020 EU energy technology policy, taking account of uncertain technology developments, uncertain carbon prices and the highly competitive global market for energy technologies. We propose a revised SET Plan that enables policy makers to be pro-active in pushing innovation in promising technologies, no matter what policy context will be realized in the future. In particular, a revised SET Plan should include a more technology-specific focus, provide the basis for planning and prioritization among decarbonization technologies, and should be based on a comprehensive approach across sectors. Selected technology targets and EU funding of innovation should be in line with the SET Plan prioritization.     

MAD

Jiang Jun , Editor-in-Chief of Urban China magazine, marvels at the architectural phenomenon that is MAD. Riding on the crest of Chinese urban expansion, Ma Yansong has optimised on extraordinary architectural opportunities. His projects, such as Beijing 2050, display a savvy design approach that synthesises innovative forms with Chinese characteristics. Copyright © 2009 John Wiley & Sons, Ltd.     

Energetic and Environmental Optimization of the Biomass Using

Biomass energy conversion can be done in several ways-combustion, gasification, pyrolysis or anaerobic fermentation （biogas production）. Each of these technologies has certain advantages and disadvantages from the point of view of energy generation for final consumption. In parallel, each of them has certain environmental impact in terms of emissions. The proposed EU directive prefers utilization of primary energy sources by application of highly efficient co-generation. Such change in assessment of energy effectiveness also means a completely new approach in assessment of current technologies. This report presents a guide for optimization of biomass energy conversion technologies assuming application of this new condition and minimal environmental impact. Specific values of emissions from particular technologies are used for the evaluation.     

SAR图像融合处理机的并行接口设计与实现

针对SAR图像进行高速实时处理的需要,提出了一种通用的、可扩展、可重构的多波段SAR图像的实时融合硬件平台,该平台的所有板卡都采用CPCI总线进行板间和板内互联,重点阐述了核心融合板卡采用专用PCI接口芯片PCI-to-PCI桥PCI2050B进行CPCI接口设计和实现的方法,最后给出了该接口的测试结果,表明该接口设计达到了并行处理的要求.     

Flow curve correction and processing map of 2050 Al–Li alloy

Hot compression tests of 2050 Al–Li alloy were performed in the deformation temperature range of 340–500 °C and strain rate range of 0.001–10 s^–1 to investigate the hot deformation behavior of the alloy. The effects of friction and temperature difference on flow stress were analyzed and the flow curves were corrected. Based on the dynamic material model, processing map at a strain of 0.5 was established. The grain structure of the compressed samples was observed using optical microscopy. The results show that friction and temperature variation during the hot compression have significant influences on flow stress. The optimum processing domains are in the temperature range from 370 to 430 °C with the strain rate range from 0.01 to 0.001 s^–1, and in the temperature range from 440 to 500 °C with the strain rate range from 0.3 to 0.01 s^–1; the flow instable region is located at high strain rates (3–10 s^–1) in the entire temperature range. Dynamic recovery (DRV) and dynamic recrystallization (DRX) are the main deformation mechanisms of the 2050 alloy in the stable domains, whereas the alloy exhibits flow localization in the instable region.     

基于ARM单片机的生理特征测量系统

在分析血压测量方法的基础上,给出了基于ARM单片机LPC2210生理特征测量系统具体设计方案,详细介绍了系统中的各