灰色线性回归组合模型在地面沉降预测中的应用

选择合适的沉降与时间的关系模型对于沉降预测而言是很重要的。根据地面沉降机理与曲线特征，对某数据序列进行了光滑性和指教规律性检验，使用线性回归和灰色模型的组合模型对该数据序列建模和预测，所得平均相对误差和均方差比值都优于GM（1，1）。研究结果表明，具有线性特征的沉降数据序列选用灰色线性回归组合模型进行短期预测效果更好。     

全地下式污水处理厂地下空间内涝风险分析与防治措施

对全地下式污水处理厂地下空间的内涝风险源进行识别与分析,建立地下空间内涝故障树.由FTA可知,对于全地下式污水处理厂,机械设备联动故障是其地下空间内涝产生的最重要因素.从设计、建设及运行方面对全地下式污水处理厂地下空间内涝风险防治措施进行探讨,分别提出了应对厂区超量进水、内部渗水、外部雨水等情况的防汛措施.     

岩溶区不同含水率破碎围岩地质雷达波形特征研究

为研究岩溶区裂隙块状结构破碎灰岩在不同含水率时的地质雷达波形特征,以广西六寨至宜州高速公路40座公路隧道为依托,进行大量现场实测.对裂隙块状结构破碎灰岩的实测数据进行筛选,并基于被选数据,采用SIR-3000地质雷达RADAN后处理软件分析不同含水率情况下的线测、点测反射强弱定性特征,同时采用对MATLAB分析软件进行数据接口语言汇编的方法,研究不同含水率情况下回波中心频率值及其分布范围,结果表明:当含水率分别小于26％、介于26％ ～42％和大于42％时,线测、点测反射强弱变化较大,回波中心频率以低频为主,分别在85,80 MHz和53 MHz附近波动,且分布范围依次减小,分别为21～105 MHz,12.5 ～ 102 MHz和11 ～ 77 MHz.     

OBSERVATION OF THE EFFECTS OF ZHENXUANYIN ON CBF OF RATS WITH VERTEBROARTERIAL ISCHEMIA AND CBF OF HEALTHY RATS

ＺＸＹｉｓａｎｅｘｐｅｒｉｅｎｔｉａｌｒｅｃｉｐｅｕｓｅｄｂｙｔｈｅａｕｔｈｏｒｔｏｔｒｅａｔｖｅｒｔｅｂｒｏｂａｓｉｌａｒｉｓｃｈｅｍｉｃｄｉｚｚｉｎｅｓｓ（ＶＩＤ）ｃｌｉｎｉｃａｌｌｙｉｎＣｈｉｎａ．ＩｔｉｓｃｏｍｐｏｓｅｄｏｆｐｕｒｅＣｈｉｎｅｓｅｍｅｄｉｃｉｎａｌｈｅｒｂｓ，ｓｕｃｈａｓｇａｓｔｒｏｄｉａｔｕｂｅｒ，ｐｏｒｉａｃｏｃｏｓ，ｌｉｇｕｓｔｉｃｕｍｗａｌｌｉｃｈｉｉ，ｅｔｃ．ＶＩＤｉｓｃａｕｓｅｄｂｙｔｒａｎｓｉｅｎｔｃｅｒｅｂｒａｌｉｓｃｈｅｍｉａ．Ｉｔｉｓａｓｉｇｎａｌｓｙ…     

体外配置CFRP筋预应力混凝土箱梁收缩徐变效应分析

以体外配置CFRP筋预应力混凝土箱梁1 001 d的长期受力性能试验为基础,采用徐变换算截面法对收缩徐变效应引起的截面应力重分布规律进行分析。理论分析与试验结果对比表明,徐变换算截面法能较好地分析持续荷载作用部分预应力箱梁的收缩徐变效应。运用双线性法和曲率法对试验箱梁的长期挠曲变形进行预测,两种分析方法预测结果基本一致,建议取长期挠度增长系数为2.45,此时长期挠度变形理论预测值与实测结果吻合较好。对现行设计规范进行有关参数修正后,持续荷载作用下预应力混凝土箱梁的最大裂缝宽度理论值与实测结果吻合较好。研究成果将为CFRP筋在体外预应力箱梁中的推广应用提供参考。     

论PLC在桥门式起重机改造中的应用

为解决桥门式起重机所频发的电气故障,将PLC应用于起重机电控系统中。介绍了PLC(可编程控制器)的性能特点和桥门式起重机电控系统的工作原理,介绍了用PLC控制器实现限位保护、综合保护、过流保护的设计技巧。     

Study on driver model for hybrid truck based on driving simulator experimental results

In this paper, a proposed car-following driver model taking into account some features of both the compensatory and anticipatory model representing the human pedal operation has been verified by driving simulator experiments with several real drivers. The comparison between computer simulations performed by determined model parameters with the experimental results confirm the correctness of this mathematical driver model and identified model parameters. Then the driver model is joined to a hybrid vehicle dynamics model and the moderate car following maneuver simulations with various driver parameters are conducted to investigate influences of driver parameters on vehicle dynamics response and fuel economy. Finally, major driver parameters involved in the longitudinal control of drivers are clarified.     

基于IWO算法的轴系—基座—壳体系统声辐射优化研究

针对轴系-基座-壳体结构复杂,对于激振力引起的结构表面声辐射尚未形成一套有效的计算和优化方法,文章尝试通过功率流有限元和声学边界元方法,对系统声优化问题进行了研究。在直线校中状态下,用相应单元模拟系统中减振器、隔振器和吸振器,建立轴系-基座-壳体系统有限元模型,利用有限元转子动力学,计算系统某特定工况下频率响应。在此基础上采用IWO算法,以各减振单元参数为设计变量,以传递路径的总功率流为目标函数进行优化,最后利用声学边界元方法对优化结果进行对比分析。结果表明,将流经路径总功率流替代场点声压为目标函数,不仅能将问题简化大大减少计算量,还能为系统减振降噪提供有效的优化计算方法,具有重要工程应用价值。     

CFG桩复合地基沉降的灰色预测

高速铁路CFG桩复合地基(路基)沉降是一个复杂的过程,采用MATLAB语言编写了基于XGM(1,1)模型预测地基沉降的程序,并将其应用于CFG复合地基沉降量的预测。通过对灰色预测XGM(1,1)模型在工程实例的应用和对比,证实XGM(1,1)模型运用到工程实际中是可行的。     

Spatial impacts of road pricing: Accessibility, regional spillovers and territorial cohesion

Road pricing policies are gaining prominence in EU countries. These policies have positive impacts leading to mobility patterns which are socially and environmentally more desirable, but they also have negative impacts. One negative impact is to be found in regional accessibility, due to the increase in generalized transport costs. This study presents a methodology based on accessibility indicators and GIS to assess the accessibility impacts of a road pricing policy. The methodology was tested for the Spain’s road network considering two road pricing scenarios. It enables not only the more penalized regions to be identified but also negative road pricing spillover effects between regions. These effects are measured in terms of accessibility changes occurring in one region produced by charges implemented in another region. Finally, the study of accessibility disparities (by calculating inequality indexes for each of the scenarios considered), provides policymakers with useful information regarding the impact of road pricing policies from the point of view of territorial cohesion.