杭州湾跨海大桥钢管桩拔除施工技术

结合杭州湾跨海大桥北航道桥大型临时工程钢管桩拔除施工实践,对海上桥梁工程临时钢管桩拔除施工工艺、施工方案及设备选择等进行总结,为海上桥梁工程临时钢管桩的拔除提供了宝贵的施工经验。     

Teleoperated Puncture Robot System:Preliminary Design and Workspace Analysis

Radiofrequency ablation (RFA) guided by X-ray images aims to relieve herniated disc pain with mini-mal invasiveness and fast recovery.It requires an accurate and fast positioning of the puncture needle.We propose a teleoperated robotic system for percutaneous puncture to support RFA.We report the kinematics modelling and workspace analysis of the proposed system,which comprises preliminary and accurate positioning mechanisms.Preliminary positioning mechanism automatically drives the needle to the puncture area,and accurate positioning is then achieved by teleoperation under the guidance of X-ray images.We calculate the teleoperation workspace of the robot system using a spatial search algorithm and quantitatively analyze the optimal structural parameters aiming to maximize the workspace.The workspace of the proposed robot system complies with clinical require-ments to support RFA.     

摩尔库仑理论应用于玻璃纤维格栅加强沥青面层剪切性能分析

车辙是由致密(体积改变)和剪切变形(没有体积改变)引起的,而剪切变形比致密变形的影响大得多。该文利用有限元软件,计算玻璃纤维格栅加强沥青面层极限承载力,分析了玻璃纤维格栅加强沥青面层的抗车辙能力。结果表明:运用摩尔库仑模型评估玻璃纤维格栅加强沥青面层具有可行性。     

Fully Prefabricated Assembling Technology of Tsinghuayuan  Tunnel in Beijing Zhangjiakou High speed Railway（京张高铁清华园隧道轨下结构预制拼装技术）

Tsinghuayuan Tunnel of Beijing Zhangjiakou High speed Railway is the first fully prefabricated high speed railway tunnel in China. The supporting structure, subrail structure, and subsidiary structure of Tsinghuayuan Tunnel are all prefabricated in the factory. The strength, deformation and stability of subrail structure are analyzed by numerical simulation method; a kind of three block type of subrail prefabricated structure is put forward according to prefabricated assembling technology; and the subrail space is used to ventilate and rescue under the stability condition. The connection between subrail structure and shield segment is the key to fully prefabricated assembling technology. By introducing the grouting technology and construction keys of subrail structure, the stress on subrail structure and shield segment can be balanced. The results can provide reference for similar projects in the future.     

南京市地铁3号线秣周路站钻孔咬合桩施工技术

结合南京地铁3号线秣周路站工程实例,阐述钻孔咬合桩施工的基本原理及特点,着重介绍钻孔咬合桩的施工要点,并对管涌、地下障碍物、分段施工接头、事故桩等常见问题进行处理,最终顺利完成了施工任务。     

回归线分割值简法在劳动卫生中的应用

回归线分割值简法应用范围广,使用条件明确,易于掌握。对于在统计资料中出现的各种分布型资料如正态分布、L型分布,弓型分布和偏态分布等,可选择适当的数学模型进行变量值的代换,将其分组派生出来的频数形成一个新的变量,构成一种新的直线性关系,将原曲线直线化,作出直线坐标图,求得回归方程式,查表得到所需要的分割值,代入方程算出x变量值。在求正常值、正常值范围和95％的可信限、剂量反应关系的统计分     

Measuring the effectiveness of methods for evaluating noise jammers

Reliable evaluations of a noise jammer's effectiveness are necessary to properly design, manufacture, and operate one, so it is important to have an evaluation model. Based on their characteristics and principles, relevant factors were classified in terms of their contribution to a unit's effectiveness. In this way an evaluation index system was established. In the proposed mathematical model a noise jammer is analyzed by combining the model of system effectiveness with the method of analytic hierarchical process. A simulation of underwater acoustic countermeasures was used to test the rationality and feasibility of the model. The results showed that this model is an effective way to solve the challenge of evaluating the effectiveness of non-offensive weapons under single working phase.     

用双旋转磁场理论分析罩极电动机性能

通过对罩极电动机的两个旋转磁场的分析，推导出总的电磁转矩公式，利用该公式就可得出罩极电动机的运行特性曲线，并计算其输入、输出功率、效率、功率因数等，文中提出的方法解决了罩民动机由于结构复杂而难以进行完整的定量分析的问题。