GPS及其在公路测量中的应用

简要介绍了GPS全球定位系统组成原理,总结了GPS测量的特点以及GPS技术在公路测量中的应用。对GPS实时动态(PTK)定位技术在公路测量中的开发和应用进行了论述。     

沥青路面裂缝扩缝机的研制

较窄的沥青路面裂缝修补前应先行扩缝,这是保证其修补质量的必要条件。而扩缝设备有关整机驱动及切缝、刀具和行走装置的结构及参数选择是其研制成功作业的关键。LK10在这些方面做了有益的探讨。     

轨道交通线网多站连续换乘客流 组织研究

为研究轨道交通线网多站连续换乘下的客流组织,将连续换乘站客流分为本线同源客流和邻线同源客流,通过Pearson 相关系数判断连续换乘站的相关性,将相关性高的连续换乘站组团,作为大客流情况下客流线控、网控的研究对象以制订相应的方案。最后以广州市轨道交通网络为例,对满足条件的各组团本线、邻线同源客流相关系数进行计算,当同源客流相关系数 大于0.6即具有高相关性时,可制订客流线控、网控方案;以地铁3号线体育西路—珠江新城组 团试点制订线控、网控方案,得出两种方案下各关联站点的限流值,并提出线控、网控方案的启动时机。结果表明,采用线控、网控方案可以有效提高连续换乘站的客流控制效果和客流疏散效率。     

融合式空间塔式算子和HIK-SVM的交通标志识别研究

在交通标志识别问题上,提出了一种基于融合式的空间塔式算子和直方图交叉核支持向量机(HIK-SVM)的分类方法.在该方法中,通过提取图像的灰度塔式词袋直方图(Gray-PHOW)特征、颜色塔式词袋直方图(Color-PHOW)特征和塔式边缘方向梯度直方图(PHOG)特征来对交通标志的外观、颜色和轮廓信息进行描述.通过提取空间塔式直方图特征,能很好地对图像各种特征的空间分布状况进行描述.提取到图像的外观、颜色、轮廓和特征的空间分布信息后,对其进行融合,最后得到的融合式的空间塔式特征具有很强的鲁棒性.将该融合式特征送入HIK-SVM进行训练和分类,取得了极其高的识别效果.     

基于分子动力学的车流运行动态特性及其模型

车辆跟驰行为受前导车和道路环境等的影响,将车辆抽象成相互作用的分子,基于分子动力学构建相互作用势函数,建立基于相互作用势函数的分子跟驰模型.采集试验路段不同点位的交通流样本,从视频中获得所需数据,并对加速度波动特性进行分析.将车辆运行状态分为常态行驶,起动加速和减速停车3种,根据实测交通数据对3种车辆运行状态进行模型参数标定,同时对分子跟驰模型进行稳定性分析验证,结果表明,相对于经典GM模型,分子跟驰模型稳定性更好,对实际交通状态拟合程度更高.     

超声波检测在钢管砼桥梁施工质量控制中的作用

在钢管砼桥梁中,钢管内砼的压注质量是保证桥梁总体质量的关键.通过超声波检测的原理和方法的介绍,以合阳嘉陵江大桥利用超声波检测确定出主弦管内砼的质量问题,有针对性地进行整改的工程实例,阐述了超声波检测在钢管砼桥梁质量控制中的重要地位和作用.     

公路水泥砼路面破损原因及其维修整治设计

通过对水泥砼路面破损现状的调查,分析其发生破坏的原因,在归纳水泥砼路面典型破坏组图的基础上,对每一种路面病害有针对性地提出了整治设计方案,并对其具体施工工艺和主要材料提出了要求,以期对公路水泥砼路面的维修整治提供指导.     

鱼洞长江大桥正桥近期工程施工监控方案研究

介绍重庆市重大工程项目鱼洞长江大桥正桥近期工程,根据其跨度大,结构横截面不对称、引桥支架高等特点和施工方案制定的相应监控方案.     

DIFFERENTIAL EXPRESSION OF GENES IN OMENTAL FAT OF NORMAL WEIGHT AND OBESE SUBJECTS AND OBESE DIABETIC PATIENTS USING cDNA MICROARRAY

Objective To identify genes differentially expressed in omental fat of normal weight subjects,obese subjects and obese diabetic patients. Methods Using a high-density cDNA microarray, gene expression profile of omental fat from normal weigh subjects, obese subjects and obese diabetic patients were compared.Results Totally, 119 and 257 genes were up-regulated in obese subjects and obese diabetic patients respectively,while 46 and 58 genes were down-regulated. A total of 77 genes, including PDK4, which switched from carbohydrate to fatty acids as the primary source of fuel, were up-regulated in both obese and obese diabetic patients, while 8 genes, including key enzymes in lipid synthesis, such as HMG-CoA synthase, fatty acid synthase and stearoyl-CoA desaturase, were down-regulated in both groups. Tyrosine-3-monooxygenase/tryptophan 5-monooxygenase activation protein θ ( YWHAZ) , a negative regulator for insulin signal transduction, was up-regulated only in obese diabetic patient, but not in normal-glycemic obese subjects. Conclusion The study demonstrated that decrease of lipogenesis along with increase of fatty acids oxidation of adipose tissue could be a common cause of insulin resistance in obesity and type 2 diabetes, while block of insulin signal transduction may trigger the transition from obesity to diabetes. Further exploration of these genes will be useful in the understanding of the pathogenesis of obesity and diabetes.     

Uplink Power Saving Potential of Cellular System with Fixed Relays

This paper presented a scheme of relayed cellular mobile telecommunication network, which only employs fixed digital relays and not more than two-hop relay routes. Power saving potential of the network is deeply studied under the assumption of not occupying additional frequency bands （i. e. relays share the same frequency bands as used by the base stations）. Theoretical analysis and simulation results have both shown that, with the same radio coverage requirement, the necessary effective transmission powers in such a relayed network have greatly decreased compared to conventional cellular network.