三峡库区港口边坡生态防护技术研究

针对三峡库区复杂工程地质与水位条件下的港口高边坡稳定性与生态防护技术进行了深入研究,在国内外库区岸坡防护技术的基础上进行了优化比选,提出了采用香根草护面加筋边坡这一新型结构体系对三峡库岸边坡进行防护,并采用有限元仿真模拟计算与工程试验相结合的方法进行了论证。实践表明,该防护技术满足三峡库岸边坡防护的安全经济、环保性要求,是一种新型有效的库区港口边坡生态防护技术。     

《麦田里的守望者》中隐晦的犹太性

"犹太性"是指犹太作家在其作品中所表现出来的某种与犹太文化或宗教相关联的一种思想观念,主要体现在某犹太作家本人或其作品中人物的思维方式、心理机制以及任何能表现犹太人生活、性格、语言、行为等特点的东西。犹太裔作家塞林格在《麦田里的守望者》中展现的主人公霍尔顿的精神流浪及其"滞后"心理等特征隐蔽地表现了该小说的犹太情结。     

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.     

关于纯电动面包物流车漏雨问题的分析与研究

文章针对纯电动面包物流车淋雨密封存在的一些漏雨问题,阐述了现状及典型淋雨漏水点,并分析了其漏水原因及进行了优化改善,进一步提高了其一次性淋雨通过率,明显提升了纯电动面包物流车的淋雨密封品质。     

半刚性基层材料动态模量研究

文章针对我国常用的水泥稳定碎石和二灰稳定碎石两种半刚性材料,通过大量的室内试验研究,建立了两种材料动态模量与无侧限抗压强度和静态模量的关系,为没有条件进行动态模量试验的单位进行路面结构设计提供建议。     

用遮帘桩型式改造三峡库区大件设备运输码头

三峡库区大件运输具有临时性、短期性的特点,大件码头的建设大都采用老码头加固改造的方式.通过对三峡库区现有码头结构特点和库区水文条件的分析,提出用遮帘桩型式的改造方案,并对改造方案的结构稳定性进行了计算分析.遮帘桩型式改造三峡库区大件运输码头,结构稳定性能够满足要求,同时结构对航道的通航能力不产生影响,是一种可以应用到三峡库区及其他山区河流水库大件运输码头改造的方案.     

基于计算机仿真的水位变动对三峡库区航道变化影响分析

利用计算机建模,对三峡水库回水变动区朝天门航段朝天门长江大桥附近7 km的范围进行三维仿真模拟试验分析。研究水位变动期航道的变化,进而分析对船舶航行和安全监管的影响。     

浅谈公交车辆前桥工字梁承孔维修工艺

本文介绍了车辆前桥工字梁承孔在行驶当中踩刹车时突然断裂的机械事故的原因，阐述了公交车辆前桥工字梁承孔的重要性，论证了对公交车辆前桥工字梁承孔维修的必要性和重要性，得出了相关的方法和建议。     

长途客车内空气质量标准评价

文章简要介绍国内长途客车标准现状,详细分析现有标准存在问题,针对相应问题提出解决方案,为标准制修订提供参考建议。     

考虑地震影响的三峡库区大水位差桥吊码头桥墩结构型式选择

水库地震在国内外的众多水利工程中时有发生,由于其震源较浅、烈度往往偏高,对水工结构物的破坏性比较严重。开展地震对水工结构的影响研究,选择合理的结构型式对减少地震带来的损失有十分重要的意义。对三峡库区桥吊码头中桥墩的结构型式选择进行研究,结合实际工程进行分析比较。研究表明,整体性高的桥墩结构抗震性能比较好,采取一定的措施增加结构的横向刚度可以提高其抗震能力。