基桩超声波检测的缺陷判断及成因分析

文章阐述了基桩超声波检测的工作原理,并结合基桩超声波检测实例,分析了钻孔灌注桩夹泥、人工挖孔桩离析、桩身空洞及蜂窝、声测管问题等基桩混凝土缺陷及其成因,提出了相应的预防措施。     

职业学校电子专业人才培养模式的探讨与研究

随着电子技术的飞速发展，传统的职业学校电子专业办学模式单一、专业课程严重滞后，毕业生的专业技能达不到企业的需求，培养的电子专业毕业生不能满足市场需求。在现代制造业形势下，传统的职业学校电子专业教育模式已明显不能适应社会的发展，这就给职业教育的办学模式提出更高的要求和带来严峻的挑战。因此“岗位定向、专班培养”的校企合作现代职业教育模式是职业教育改革的趋势，是适合现代企业发展的职业教育办学模式，对促进学生培养和职业教育的可持续发展具有十分重要的意义。     

单RBC跨多MSC场景数据制作及测试案例分析

简述郑徐客专C3单电台交接及无线超时故障问题机理,总结单RBC跨多MSC场景数据制作及测试案例经验。在杭黄铁路工程中,通过分析杭黄铁路GSM-R系统设计方案和RBC管辖范围,得出RBC与MSC对应关系,提出MSC制作RBC和LAC邻区数据及联调联试测试案例建议并运用到工程实施过程中,避免类似故障的发生,为杭黄铁路顺利通过联调联试提供有力保障,单RBC跨多MSC数据制作及测试案例经验可供后续线路参考。     

UG/CAM系统的模版功能在船模加工中的应用

对于船舶模型加工而言,CAM系统的应用是缩短技术准备周期、实现复杂型线船舶模型加工的有效途径。能否充分运用好CAM系统的部件加工知识,将直接影响CAM系统的实施效果。通过相应配置,UG/CAM系统能有效定制、管理和继承模版,从而快速、高质量实现船舶模型的数控编程及加工,确保船模加工质量和提高生产效率。     

基于道路交通事故分析的汽车碰撞试验形式研究及其发展

文中介绍了道路交通事故分析对于研究汽车碰撞试验的实施框架和技术路线,并借鉴国内外在该领域的相关技术方法,阐述应该如何基于道路交通事故来完善现行的汽车碰撞试验形式.通过道路交通事故分析,一方面可以验证我国现行汽车碰撞试验体系的有效性；另一方面能够优化现行汽车碰撞试验体系中的试验形式及指标.     

公路工程质量检测要点分析

某二级公路某标段工程经过实体检测、外观检测,尤其是施工过程中的质量抽检,真实、客观地反映了公路工程施工质量情况,可为该工程日后竣工验收、运营、养护和管理提供科学依据.     

A bi-level model of dynamic traffic signal control with continuum approximation

This paper proposes a bi-level model for traffic network signal control, which is formulated as a dynamic Stackelberg game and solved as a mathematical program with equilibrium constraints (MPEC). The lower-level problem is a dynamic user equilibrium (DUE) with embedded dynamic network loading (DNL) sub-problem based on the LWR model (Lighthill and Whitham, 1955; Richards, 1956). The upper-level decision variables are (time-varying) signal green splits with the objective of minimizing network-wide travel cost. Unlike most existing literature which mainly use an on-and-off (binary) representation of the signal controls, we employ a continuum signal model recently proposed and analyzed in Han et al. (2014), which aims at describing and predicting the aggregate behavior that exists at signalized intersections without relying on distinct signal phases. Advantages of this continuum signal model include fewer integer variables, less restrictive constraints on the time steps, and higher decision resolution. It simplifies the modeling representation of large-scale urban traffic networks with the benefit of improved computational efficiency in simulation or optimization. We present, for the LWR-based DNL model that explicitly captures vehicle spillback, an in-depth study on the implementation of the continuum signal model, as its approximation accuracy depends on a number of factors and may deteriorate greatly under certain conditions. The proposed MPEC is solved on two test networks with three metaheuristic methods. Parallel computing is employed to significantly accelerate the solution procedure.     

高强度光敏胶拉伸剪切强度测试方法

介绍了一种高强度光敏胶拉伸剪切强度测试方法,分析了影响测试结果的几种主要因素。     

Model and a solution algorithm for the dynamic resource allocation problem for large-scale transportation network evacuation

Allocating movable resources dynamically enables evacuation management agencies to improve evacuation system performance in both the spatial and temporal dimensions. This study proposes a mixed integer linear program (MILP) model to address the dynamic resource allocation problem for transportation evacuation planning on large-scale networks. The proposed model is built on the earliest arrival flow formulation that significantly reduces problem size. A set of binary variables, specifically, the beginning and the ending time of resource allocation at a location, enable a strong formulation with tight constraints. A solution algorithm is developed to solve for an optimal solution on large-scale network applications by adopting Benders decomposition. In this algorithm, the MILP model is decomposed into two sub-problems. The first sub-problem, called the restricted master problem, identifies a feasible dynamic resource allocation plan. The second sub-problem, called the auxiliary problem, models dynamic traffic assignment in the evacuation network given a resource allocation plan. A numerical study is performed on the Dallas–Fort Worth network. The results show that the Benders decomposition algorithm can solve an optimal solution efficiently on a large-scale network.     

路基路面结构参数统计分析工具的程序实现

路基路面结构参数的统计分析是路基路面质量管理的重要环节，结构参数的统计特征及其概率分布模型是路面结构可靠性分析和设计的前提条件。针对路基路面结构参数，以数理统计知识为基础，利用可视化编程工具Visual C＋＋和MFCODBC数据库访问技术，开发出相应的统计分析系统。利用该系统可建立路基路面结构参数统计分析数据库，实现路基路面结构参数统计分析工作的批量化和自动化。