强夯碎石墩加固软基路堤的稳定性有限元分析

强夯碎石墩复合地基已经在工程中得到应用,但理论研究远远落后于工程实践。采用有限元数值分析方法,就碎石墩墩形、过渡区厚度、置换率、墩体长度等因素对复合地基上路堤稳定性的影响进行了定量分析。分析结果表明,强夯碎石墩的加固作用明显,在相同的置换率下采用少墩粗径可以获得更好的加固效果。     

基于双曲函数的车辆减速策略及安全跟驰车距的计算

车辆减速策略与跟驰车距具有相互制约的关系.分析了车辆减速运动规律,提出反映人们期望和行为特点的基于双曲函数的车辆减速策略,进而建立计算安全跟驰车距的数学模型,并按照国际载运工具和我国上海磁浮列车的运行舒适性评价标准,对200 km/h跟驰速度条件下安全车距的计算式进行了仿真试验与数值分析,验证了相关数学模型与计算方法的有效性.     

快速路入口匝道控制选择标准及基本参数分析

论述了快速路匝道管理与控制的必要性,分析了4种常用的匝道管理策略,重点对入口匝道控制进行剖析,给出了入口匝道控制的分类以及选择标准,并探讨了其中的3个基本设计参数,为我国快速路入口匝道控制的实施提供了参考。     

On the role played by turbulence closures in hull shape optimization at model and full scale

 The practical use of automated computational fluid dynamics (CFD)-based design tools in the ship-building industry requires powerful flow solvers which are able to take into account realistic geometries as well as complex physical phenomena, such as turbulence. A shape optimization tool is developed in this framework. A derivative-free optimizer, yielding both flexibility and robustness, is preferred to the classical gradient-based method, which is more difficult to implement and is still limited to only moderately complex problems. The flow solver included in the design procedure solves the incompressible Reynolds-averaged Navier–Stokes equations on unstructured grids using a finite-volume formulation involving several near-wall low-Reynolds-number turbulence models. The design tool is used to optimize the stern of a modern hull shape at model and full scale, with different purposes being considered. More precisely, the drag reduction and the homogenization of the flow in the wake are expected by controlling the longitudinal vortex generated. Our interest is particularly focused on the influence of turbulence modeling in the design process. The effects of a two-equation model based on the eddy-viscosity assumption and a second-order closure relying on the Reynolds stress transport equations are compared. Received: September 24, 2002 / Accepted: April 14, 2003 RID="*" Acknowledgment. The authors thank the scientific committee of CINES (project dmn2050) for the attribution of CPU time.     

INFLUENCE OF POLYACTIN A ON THE THROCYTE TUMOR－ERYTHROCYTE ROSETTE FORMING OF SARCOMA 180 BEARING MICE

ＩＮＦＬＵＥＮＣＥＯＦＰＯＬＹＡＣＴＩＮＡＯＮＴＨＥＴＨＲＯＣＹＴＥＴＵＭＯＲ－ＥＲＹＴＨＲＯＣＹＴＥＲＯＳＥＴＴＥＦＯＲＭＩＮＧＯＦＳＡＲＣＯＭＡ１８０ＢＥＡＲＩＮＧＭＩＣＥ（王信隆）（李娜）（芦燕青／）（邓守谦）（王西强）ＷａｎｇＸｉｎｌｏｎｇ；...     

隧道掘进面爆破后悬浮颗粒浓度动态变化研究

爆破后悬浮颗粒浓度与距离关系曲线呈山峰状，峰值位于距掘进面较远处，抛烟距离约130－150m。距掘进面不同距离，其悬浮颗粒浓度衰减有较大差异，较远处快于较近处，且速度变化不均匀。     

河道崩岸影响因子量化分析

通过建立崩岸影响因子评价层次分析模型,对河道崩岸众多影响因子进行了量化分析,探讨了主要影响因子对崩岸的作用,为崩岸机理及防治的深入研究打下基础。     

基于USB传输层的蓝牙主机控制器接口(HCI)的实现

探讨了蓝牙通信的最基本也是最重要的方面，即蓝牙主机控制器接口基于USB传输层的通信，详细介绍了HCI分组的类型，以及每种分组类型的数据格式，阐述了蓝牙设备间连接和通信的相关步骤和原理，给出了软件流程图和代码。     

深桥墩大型异形双壁钢围堰锚碇系统施工

本文以武汉军山长江公路大桥异形双壁钢围堰的下沉的锚碇系统施工为实例 ,介绍了国内同类型桥梁中最大钢围堰锚碇系统的施工技术。     

汽车交流发电机Y0整流电路的分析与计算

基于克希荷夫电压定律，对汽车交流发电机所特有的一类整流电路——Y0整流电路的工作过程进行了全面的分析，解决了自该电路应用以来在其整流过程分析上存在的一些问题，给出了在畸变电动势作用时Y0整流电路的输出电压表达式，在理论上解决了这种整流电路的输出电压及发电机三次谐波功率的计算问题。