真空管道运输系统管道模型结构分析与实验内容

对真空管道运输(ETT)系统管道实验模型的整体结构和尺寸、主要功能部件的设置以及该管道实验模型建成后将进行的实验内容等进行了分析和介绍。     

浅谈金融危机对商贸企业的影响

针对当前金融危机的不利形势,结合商贸企业经营现状,着重分析了企业面临的挑战和机遇,并提出了应采取的应对措施.     

基于标度扩展的层次分析法在舰艇对空作战能力评估中的使用

舰载武器系统作战能力评估与分析是海军现代化建设研究领域的一个重要课题,通过对不同武器配置的作战能力的评估与分析可以检验武器配置是否优化合理,研究的着眼点就是探索能够最真实检验一种武器配置方案是否能够最大限度地满足作战能力的评估的各项指标.将传统的AHP方法,改进为标度扩展的AHP方法,引进科学评估方法,所有基本指数由专家确定,并对专家的判断进行一致性检验和最小偏差处理,理论与经验相结合,使最终的指数最大限度地符合现实,其评价体系是直观的,易被军事人员接受.     

京津城际铁路亦庄车站AB类填料路基填筑质量控制

通过京津城际时速350 km客运专线亦庄车站路基工程施工实践,对如何控制AB类填料填筑路基质量,提出了从填料、填筑过程、检测控制三阶段全面质量控制的方法和要点,并介绍了试验段路基冬期施工方法及注意事项,以供同类工程施工参考。     

ESⅡ假人腹部力和车门内饰造型研究

文中对ESⅡ假人腹部力和其影响因素进行研究，根据仿真分析和实车试验数据分析，研究降低腹部力的改进方案，并进行实车验证。为避免给后期匹配侧气囊带来困难，提出在内饰造型阶段，对车门内饰板造型进行校核和控制，建议有利于降低侧碰假人伤害的造型，使在不匹配侧气囊的情况下，假人伤害值最小。     

Biologically induced differences in erodibility and aggregation of subtidal and intertidal sediments: a possible cause for seasonal changes in sediment deposition

This study was carried out to describe the difference in erodibility and aggregation in a tidal basin including both subtidal and intertidal study sites and to use these results to explain the shifting erosion/deposition cycles at the sites. Erosion thresholds, erosion rates and settling velocities of the eroded material were measured at a mudflat transect and at sediment cores taken from a nearby tidal channel during surveys made in May 2000 and March 2002. Surface samples were analysed for grain-size, chl. a content, faecal pellet content, dry bulk density and organic content. Additionally, surface samples were taken at eight occasions in the period January 2002 to May 2003 from shallow tidal channels in the area. These samples were analysed for mud content and showed that major shifts in sediment distribution occurred in the period. The erodibility of the mudflat was generally high due to pelletization by the mudsnail Hydrobia ulvae but close to the salt marsh much lower erodibility was found, probably due to stabilisation by microphytobenthos. In contrast, the erodibility of the channel bed seemed to be very little influenced by biological activity and the relatively low erodibility found here was caused by physical characteristics of the sediment. The sediment eroded from the mudflat was generally strongly pelletized and showed high settling velocities whereas less aggregation and lower settling velocities were found for the channel bed sediments. Temporal variations of the mudflat stability and hydrodynamics resulted in temporal variations of deposition and erosion and the changing stability at the mudflat is likely to be one of the main reasons for a general transport of fine-grained sediment from the mudflat to the channel in the cold seasons and vice versa during the rest of the year.     

国外援潜救生系统现状及发展趋势

文章主要对近代潜艇失事事件作了大致的回顾,并对国外援潜救生船及援潜救生手段作了介绍.     

基于动力特性与小波变换的损伤检测方法在海洋平台中的应用

研究了平台下部结构的不同位置发生不同程度损伤时，利用数值计算可以得到平台结构的固有频率、振型、模态应变能、频响函数等有关参数。利用上述参数变化，可以用来识别损伤、损伤位置以及损伤程度。研究表明，振型参数可以用来对损伤进行定位，模态应变能方法可以发现结构的早期损伤，而频响函数可以发现下部结构任何构件的断裂；借助于小波变换对频响函数进行分析，可以发现早期结构损伤。     

船舶电站频载控制器的仿人智能控制研究

通过分析船舶电站频载控制器的工作特点,以仿人智能比例控制为基础,提出了船舶电力系统频载控制器的建模新方法.     

浅谈QM200GY越野摩托车后平叉焊接强度的提升

通过对6063、6061和日本7×××Zn系列铝合金材料试样进行拉力对比,选用材料6063（Mg＋Si合金）经T6热处理后,强度有很大提高。铝合金MIG焊,焊接接头易出现焊缝成型差、裂纹、气孔、烧穿,未焊透、未熔合和夹渣等缺陷;而TIG焊是一种高效焊接方法,焊接时保护气体从焊枪的喷嘴中连续喷出,在电弧周围形成气体保护层隔绝空气,防止对钨极、熔池及邻近热影响区的有害影响,从而获得优质的焊缝。整改后的后平叉经过跌落试验能达到8500次左右,路试验证也较整改前有明显改善。