无水港在港口发展中的作用

分析无水港与内陆集装箱货运站及沿海港口的区别,将无水港定位为现代物流中心,总结国内无水港的发展现状和常见模式,给出发展无水港的条件和应注意的事项。从供应链角度分析无水港与港口的关系,论述无水港建设对港口发展和内地经济发展的重要性。     

基于脱轨系数安全标准的重车重心限制高度

引起车辆脱轨的原因主要有车轮的垂直载荷减小和轮轨间的侧向力增大2种。依据对车轮脱轨临界状态的受力分析,建立轮对脱轨的数学模型,推导出横向力作用下脱轨系数的计算公式。以C64K型敞车为例,分析横向力大小与其作用点高度之间的关系,得出车辆在直线和曲线上脱轨的最不利横向力组合。基于最不利横向力组合,为保证车辆运行安全,按照脱轨系数不得超过1.2的标准,分别计算分析C64K型敞车在4种最不利装载工况、3种最不利运行工况下的脱轨系数与重车重心高度的关系。由计算结果可以确定重车重心限制高度为2 207 mm,比现行的重车重心限制高度增加207 mm。     

Correlation analysis between the interface membrane and loose hip prosthesis

Objective To analyze the cause of prosthesis loosening by observing the interface membranes harvested during the hip restoration operation. Methods A total of 28 specimens of interface membrane around the loose prosthesis were harvested from 28 patients undergoing the restoration of total hip replacement. All the specimens underwent the observation of appearance, light microscopy and scanning electronic microscopy(SEM). Results All the gaps around the loose prosthesis were filled with interface membrane of different thickness. The color of the most interface membrane was madder red, and the other one third of membrane was black. The comparatively thicker membrane was similar to scar connective tissue while the thinner was similar to fiber membrane. A large number of wear debris, macrophages and foreign-body giant cells were found under light microscope. With SEM observation a large number of different diameter collagen fibra structures that looked like scar tissues were arranged disorderly in a great mass, foreign particles and bone debris of different size were distributed unevenly, and the fibroblast was distributed in the collagen fiber. Conclusion Wear debris is related to inflammatory cell response around the interface membrane of the loose prosthesis. The wear debris engulfed by macrophage stimulates the interface membrane to release bone resorption factors (such as TNF) which lead to osteolysis, and this is one of the most important causes of the prosthesis loosening.     

谈谈短班航海英语教学应注意的几个问题

分析和探讨如何通过短期培训提高船员的英语水平，短班英语培训教学中教师应把握的几个方面的问题。     

基于Linux平台的高速拥塞控制算法实现与应用

改进BIC拥塞控制算法，算法的性能在高速网络中得到了很大的提高，优化算法通过设置窗口门限值和现行TCP有机地融为一体。优化算法成功植入Linux内核，并在平台中得到很好的应用。     

基于灰色支持向量机的大型集装箱船上层建筑舱室的噪声预测

以A集装箱船上层建筑舱室噪声实测值为训练样本,利用灰色预测中"累加生成"的优点对训练样本进行处理,使其更具规律性.选用ERBF核函数,建立集装箱船上层建筑舱室噪声的灰色支持向量机预测模型,应用此模型对B集装箱船上层建筑舱室的噪声进行了预测.最后,将此模型推广到了散装货船的舱室噪声预测中.预测结果表明,将灰色理论与支持向量机相结合,能更好地提高船舶上层建筑舱室噪声的预测精度.     

北京西站无站台柱雨棚安全监测方法

无站台柱雨棚的主体结构为(22.5 2×46 20.5)m的钢桁架拱,桁架最大间距29.5 m,通过檩条形成覆盖结构。这种结构属国内首次采用,且跨度较大,为保证结构的使用安全,对桁架的应力、变形进行了长期监测。文章就监测部位、测点布置、传感器的安装、观测方法等进行了阐述。     

建设创新型长江航道

船舶在海上航行由于种种原因造成船舶搁浅,船长、驾驶员及全体船员应认真分析船舶搁浅状况,采取各种措施,在保证船员安全的前提下,使船舶、货物损失减少到最低限度。     

浅析发展权的概念

发展权是第二次世界大战后人类最具进步意义的权利理念之一,弄清发展权的内涵有利于我国在全球竞争日益激烈的21世纪争取最大的发展空间。本文从发展权提出的时代背景、《发展权利宣言》入手详细叙述了极富争议的发展权概念逐步确立的过程,最后阐述了作者对发展权概念的理解。     

“长鲸2”号大型耙吸挖泥船开发设计

简要介绍了国内首先启动研发的新型大型耙吸挖泥船“长鲸2”号的研发设计过程、主要性能参数以及设计中的亮点。