邵怀高速公路路基沉降与稳定观测及分析

以邵怀高速公路为例,结合山区高速公路的特点,提出了山区高速公路路基沉降与稳定观测方案,针对不同地质和地形条件采取了不同的沉降观测手段,对观测成果进行了分析,基本掌握了路山区高速公路基沉降变形的规律,得出路基稳定性结论,并提出了建议。     

反求工程中残缺点云建模方法研究

针对反求工程中残缺点云建模问题，把点云按残缺的位置和特征进行分类，并利用规则曲面重构、不规则NURBS曲面拟合以及神经网络曲面构造相结合的方法，提出了一些针对残缺点云建模关键的算法。工程实践表明这些方法简单、实用，生成的曲面CAD模型满足曲面连续性和光顺性的要求，能获得满意的设计效果。     

Relationship between quality and attributes of elliptical spot welds of high strength steel

More high strength steel(HSS) sheets are being applied in the automobile industry to improve safety and fuel efficiency.When HSS is spot welded, the strength of the welded-joint is usually determined by the attributes of the weld nugget.However, it is diffcult to obtain the circular nugget and to establish the relationship between the weld attributes and welding quality because of a large number of variables and experimental uncertainty.In the paper, the numerical analysis model of tensile-shear strength test for HSS spot welds was established.And the critical ellipticity of the elliptical spot weld was determined through finite element analysis.Quantitative relationship between elliptical weld attributes and weld strength was investigated statistically using the Latin hypercube and regression analysis method.The sheet thickness, nugget ellipticity, hardness radio and yield strength have the most influential attributes in affecting welding quality.The research results can be used as a guideline for HSS resistance spot welding design.     

Potential benefits of an adaptive forward collision warning system

Forward collision warning (FCW) systems can reduce rear-end vehicle collisions. However, if the presentation of warnings is perceived as mistimed, trust in the system is diminished and drivers become less likely to respond appropriately. In this driving simulator investigation, 45 drivers experienced two FCW systems: a non-adaptive and an adaptive FCW that adjusted the timing of its alarms according to each individual driver’s reaction time. Whilst all drivers benefited in terms of improved safety from both FCW systems, non-aggressive drivers (low sensation seeking, long followers) did not display a preference to the adaptive FCW over its non-adaptive equivalent. Furthermore, there was little evidence to suggest that the non-aggressive drivers’ performance differed with either system. Benefits of the adaptive system were demonstrated for aggressive drivers (high sensation seeking, short followers). Even though both systems reduced their likelihood of a crash to a similar extent, the aggressive drivers rated each FCW more poorly than their non-aggressive contemporaries. However, this group, with their greater risk of involvement in rear-end collisions, reported a preference for the adaptive system as they found it less irritating and stress-inducing. Achieving greater acceptance and hence likely use of a real system is fundamental to good quality FCW design.     

CONSTRUCTION OF HUMAN INTERLUEKIN-18 DNA VACCINE AND IT‘S EXPRESSION IN MAMMALIAN CELLS

Ｈｕｍａｎｉｎｔｅｒｌｅｕｋｉｎ 18(ｈＩＬ 18)ｉｓａｎｅｗｌｙｉｄｅｎ ｔｉｆｉｅｄｃｙｔｏｋｉｎｅｍａｉｎｌｙ ｐｒｏｄｕｃｅｄｂｙｍｏｎｏｃｙｔｅｓａｎｄｍａｃｒｏｐｈａｇｅｓ.ＴｈｅｃｙｔｏｋｉｎｅｃａｎｉｎｄｕｃｅＴｈ1ｃｅｌｌｓｔｏｓｅｃｒｅｔｅＩＦＮ γ ,ＩＬ 2ａｎｄＧＭ ＣＳＦ .Ｉｔｅｎｈａｎｃｅｓｔｈｅｃｙ ｔｏｔｏｘｉｔｙｏｆＮＫａｎｄＣＴＬｃｅｌｌ,ａｎｄａｌｓｏｒｅｄｕｃｅｓｔｈｅｌｅｖ ｅｌｏｆＩＬ 10 .Ｔｈｕｓ,ｔｈｅｒｅｉｓｐｏｔｅｎｔｉａｌｔｈｅｒａｐｅｕｔｉｃｖａｌｕｅｏｆ…     

Formal analysis of authentication in 802.11i

Authentication is the basis of the security of IEEE 802.11i standard. The authentication process in 802.11i involves two important protocols: a 4-way handshake and a group key handshake. A formal analysis of authentication in 802.11i is given via a belief multisets formalism. The analysis shows that the 4-way handshake and the group key handshake may provide satisfactory mutual authentication, key management, and issue of a new group temporal key from an access point to a user device, under the guarantee of mutual possession of a confidential pairwise master key. The analysis also shows that there exists a denial of service attack in the 4-way handshake and some seeming redundancies are useful in the protocol implementation.     

基于SOC-OCV优化曲线与EKF的锂离子电池荷电状态全局估计

SOC-OCV曲线是锂离子电池状态估计的基础.针对传统HPPC测试法在非测试点不能描述电池非线性特性和小电流恒流放电法得到的OCV曲线精度不足等问题,提出一种基于粒子群优化算法的OCV曲线优化方法.该方法将小电流恒流放电得到的OCV曲线进行平移,以平移曲线在测试点与HPPC测试得到的OCV值之间的误差和最小为优化目标,...     

地铁车辆段三大检修工艺设备的技术接口

介绍地铁车辆段三大检修工艺设备--不落轮镟床、列车清洗机、地下式架车机,以及它们与车辆、牵引供电、低压配电、信号、土建等相关专业的技术接口.指出三项设备与车辆的接口是建设管理的重点,分析在工程设计和建设过程中应注意的接口要点.不落轮镟床与车辆的接口需要明确加工的对象与精度,以及车辆的装夹方式;列车清洗机需明确车辆的主要尺寸、车底电气箱的防水等级、表面油漆对洗涤剂的要求,以及清洗机对雨刮器的要求等;地下式架车机需明确车辆的重量和主要尺寸,并核算转向架是否会与地下式架车机的车体顶升支柱发生干扰.     

超深矿坑水下填筑方案探索

在市政工程中,超深矿坑的回填比较特殊。该文通过对多种回填方法进行比选和探讨,提出了合理方案。