主成分分析法在高速公路沥青路面使用性能评价中的应用

在多指标综合评价中,主成分分析方法是一种较为客观的综合评价方法.利用这种方法对高速公路沥青路面使用性能进行综合评价,不仅能综合反映各指标对路面评价值影响强弱的信息,而且可以确定各指标的较客观的权重,由此尽量地避免评价过程中主观因素的影响,为正确进行高速公路沥青路面养护决策提供了保证.     

走-停巡航系统分层控制器设计

结合驾驶统计模型，设计了走一停自适应巡航系统的纵向车间距离控制器。上位控制器的设计与车辆模型无关。在建立目标性能函数的基础上得到控制律；而下位控制器则将油门和制动控制独立设计，依据一定的切换逻辑使它们分别作用于车辆。在制动控制的设计中引入了改进型史密斯预估器。在多种工况下的仿真试验中表明控制器性能良好。     

汽车转向拉杆及球头销寿命试验台的开发

汽车转向拉杆及球头销是汽车上的重要部件，其强度和可靠性直接关系到汽车行驶安全，为满足该部件的产品要求，设计了一种转向拉杆及头销寿命试验台，介绍了试验台的试验技术参数，试验台的组成及原理，该试验台经工厂使用，效果良好。     

摊铺机声控找平系统原理

介绍了摊铺机声控自动找平系统的组成、控制原理，着重对系统采用的高度传感器的工作原理及电路作了详细的说明。     

膨胀土结构分形特征研究

分析了膨胀土结构的分形行为,推导了膨胀土颗粒粒度的分维、颗粒质量的分形、孔隙分布的分维、孔隙表面分维计算公式,并结合实例进行验证,所获得的分析结果为铁路膨胀土路基稳定性的研究奠定了基础.     

汕头国际集装箱码头道路堆场地基处理监测及效果检验

结合汕头国际集装箱码头道路堆场地基处理监测,介绍在堆载预压的过程中采用各种测试手段开展全方位、全过程的监测工作,检验堆载预压法改善和加固软土地基的效果和能力。     

Poisson noise removal based on nonlocal total variation with Euler’s elastica pre-processing

An enhancement-based Poisson denoising method for photon-limited images is presented. The noisy image is firstly pre-processed for enhancing incomplete object information, and then it is denoised while preserving the restored structural details. A variational regularization model based on Euler’s elastica (EE) is proposed for image enhancement pre-processing. A nonlocal total variation (NLTV) regularization model is then employed in the second stage of image denoising. The above two optimization problems are solved by the alternating direction method of multipliers (ADMM). For Poissonian images with low image peak values, experiments demonstrate the validity and efficiency of the proposed method for both restoring geometric structure and removing noise.     

Value of travel time: An activity‐based analysis with combined RP and SP data

Under certain assumptions, values of travel time (VOT) can be divided into two parts: one associated with travel (i.e., the value of reducing travel time disutility) and the other associated with activities (the shadow price of time). The empirical results of combining RP and SP data showed that the VOT of travel was greater than that of activity. The results also showed that SP experiments that did not take or only took part of activities into consideration would underestimate VOT.     

Legal and practical consequences of not complying with ISM code

Almost a decade since port corporatization was introduced in Australia it is becoming clear that initial objectives are not being realized. This paper explores some of the legal and legislative causes, the effect on port operation and investigates what necessary conditions are required to deliver an effective corporatized port business. The paper argues that effective corporatization is a product of effective legislation—one which, while emulating private sector business practices—can deliver a business model that is innovative, entrepreneurial, commercially oriented and free from self-serving political constraints.

The legislation and corporatized artifacts in Australian mainland ports have failed, in general, to deliver this. Arguably, the legislation has, in fact, created a model with inherent flaws and serious contradictions. The legislation enacted is such that while it has set in place a model that articulates commercial objectives, the model created is in fact one in which political objectives may override commercial ones; where strategy may be determined by a bureaucratic elite without the requisite skills and insights, and the resultant strategy appears ad hoc; and a corporate culture that frequently has failed to transcend that of the statutory authority and public utility model. This paper will test these assertions against the developments in the port of Melbourne.