安全诚信管理——水上安全监管新模式

中华人民共和国海事局2003年6月1日开展评选安全诚信船舶以来,在一定程度上提高了船舶单位安全生产水平,但这种制度并没有得到长足发展。客观地说,这种安全诚信做法还没有为广大海事执法人员所认同,本文旨在进一步转变执法人员观念,提高对安全诚信的认识,助推船舶单位构建安全诚信管理体系,实现水运的持续快速发展。     

The experimental observation on the repairing spinal cord injury by olfactory ensheathing cells allograft of different sources

Objecttive To observe the repaired effect of distinct source olfactory ensheathing cells （OECs） on spinal cord injury （SCI） rats. Methods These OECs were dissociated from olfactory bulb and olfactory mucosa of SD rats and transplanted to the injuried region of spinal cord injury rats. The function of nerve, motor evoked potential of hind legs and the histopathlogical diversities of injuried spinal cord were observed. Results The OECs grafts into the SCI area could survive longer time. The BBB scale, incubation stage of EP and histopathologic manifestations showed that the group with transplanted OECs regained more improvement in hindlimb than the control group. Conclusion The OECs of two sources have the same ability to regain and improve the axonal function which can promote axons regeneration of SCI.     

公路建设项目可行性研究中的交通量预测方法

从公路建设项目的自身特点出发 ,探讨了在区域社会经济发展预测的基础上应用四阶段法进行公路建设项目可行性研究中的交通量预测方法。同时针对以往传统的某些做法 ,指出应注意的问题并提出相应的措施     

拱圈喷射混凝土施工工艺及操作经验

介绍了旧桥加固改造拱圈喷射混凝土的施工经验,提出材料控制是前提,合适的喷射混凝土配合比是关键,喷射方式是重点.     

龙潭河特大桥施工过程静力仿真分析研究

龙潭河特大桥为主跨(106 3×200 106) m 的预应力混凝土连续刚构桥,最高桥墩178 m.桥梁在施工过程中有其自身的结构特点,利用有限元方法建立其仿真分析模型,模拟桥梁的施工及成桥状态,计算得到了最高桥墩悬臂施工预拱值和各施工阶段的应力值,分析了自重作用下几个典型工况的几何非线性对高墩大跨连续刚构桥内力和位移的影响.     

Visco‐elastic traffic flow model

To increase our understanding of the operations of traffic system, a visco‐elastic traffic model was proposed in analogy of non‐Newtonian fluid mechanics. The traffic model is based on mass and momentum conservations, and includes a constitutive relation similar to that of linear visco‐elastic fluids. The further inclusion of the elastic effect allows us to describe a high‐order traffic model more comprehensively because the use of relaxation time indicates that vehicle drivers adjust their time headway in a reasonable and safe range. The self‐organizing behaviour is described by introducing the effects of pressure and visco‐elasticity from the point of view in fluid mechanics. Both the viscosity and elasticity can be determined by using the relaxation time and the traffic sound speed. The sound speed can be approximately represented by the road operational parameters including the free‐flow speed, the jam density, and the density of saturation if the jam pressure in traffic flows is identical to the total pressure at the flow saturation point. A linear stability analysis showed that the traffic flow should be absolutely unstable for disturbances with short spatial wavelengths. There are two critical points of regime transition in traffic flows. The first point happens at the density of saturation, and the second point occurs at a density relating on the sound speed and the fundamental diagram of traffic flows. By using a triangular form flow–density relation, a numerical test based on the new model is carried out for congested traffic flows on a loop road without ramp effect. The numerical results are discussed and compared with the result of theoretical analysis and observation data of traffic flows. Copyright © 2011 John Wiley & Sons, Ltd.     

布敦岩沥青改性机理

为了揭示布敦岩沥青(BRA)改善基质沥青性能的内在机理,采用X射线衍射分析、扫描电镜分析、红外光谱分析以及热分析等方法研究了克拉玛依70#沥青和BRA改性沥青的化学组成与结构.结果表明:BRA中含有较多的碳酸钙,显著提高了沥青与集料的粘附性能和抗剥离能力;在BRA改性沥青中,沥青和BRA颗粒相互包容、渗透,形成了彼此交...     

舰船舱室防火设计研究

主要研究舰船的防火设计,着重于舰船大型舱室在进行防火设计时所遇到的防火分隔设置这一问题。主要目的是对大型舱室的防火分隔进行设计,通过火灾模拟程序模拟计算,提出最优设计方案,使防火费效比达到最佳。     

电力推进舰船中央冷却控制装置优化设计研究

对某型综合电力推进舰船中央冷却系统及其相关控制技术作了综合分析,提出了系统自动控制优化设计的思路。控制装置经样机试制和实船使用,为中央冷却系统的可靠性运行提供保障。     

战术数据链抗干扰性能仿真技术

战术数据链抗干扰性能仿真可定量描述出干扰的影响,具有重要的研究意义。本文介绍了战术数据链及其仿真技术的发展现状,重点分析了Link 16终端设备联合战术信息分发系统(JTIDS)抗干扰的关键技术:信道编码技术、扩频技术与调制技术。在此基础上,采用Matlab提供的仿真平台Simulink建立了战术数据链的链路级仿真模型,实现了其抗干扰性能的仿真。相关研究成果可应用于射频干扰对数据链性能影响的定量评估,以及数据链抗干扰或者干扰策略优化设计中。