航海类专业学生党建工作实效性的探讨

增强航海类专业学生党建工作的实效性,是航海院校党建工作的迫切需要．由于专业的特点和毕业生工作环境的特殊,影响了学生党建工作的效果;针对当前出现的党员比例偏低、党员教育管理有待加强等现象,提出了建章立制、强化发展、加强管理等增强实效性的对策．     

高速公路沥青混凝土路面养护短期效用模型评价指标研究

公路的预防性养护中,养护时机的选择至关重要。养护短期效用模型的建立为养护时机和养护策略的选择提供了新思路。该模型旨在建立各种预养护措施在不同类型道路、不同交通状况路段、不同养护时间的效用数据库,其建立要基于大量相关的路况调查数据。我国现阶段高速公路沥青混凝土路面使用性能评价指数采用PQI,其包含4项指标:PCI、SSI、RQI、SFC,在效用模型建立过程当中若按此进行路况性能的评价,数据采集势必存在规模大、间隔周期短、每次延续时间长等问题。基于此,尝试提出采用以平整度IRI表征的RQI作为高速公路沥青混凝土路面路况评价的单一指标,以简化数据的采集过程,保证调查数据的时效性。最后用灰关联法验证了其可行性。     

The influence of tyres on the use of the CPX method for evaluating the effectiveness of a noise mitigation action based on low-noise road surfaces

The usage of low-noise road surface can be an important and effective noise mitigation action and, in many cases, it might represent the only viable solution. After the laying of a low-noise road surface, it is necessary to verify if the planned objectives have been actually obtained: the Close Proximity Method (CPX) could be a possible method to achieve this result.The current release of the ISO 11819 draft regarding CPX redirects to a future third part for all details about the reference tyre to be used, while the previous one gave indications on dimensions, kind of tread pattern and maintenance conditions. As well known, tyre dimensions and tread pattern are the main sources of variability of rolling noise. Even though many tyres available on the market comply with all ISO requirements, the choice of a brand or a model rather than another one could nevertheless influence results of measurements.In this work, results obtained in several measurement sessions, repeated using different tyres, are compared, aiming to analyse the influence of the tyre choice in assessing the acoustic performance of a low-noise road surface. Limitations and advantages of the CPX method in regards to the evaluation of the effectiveness of a noise mitigation action are reported, and new perspectives are suggested, in order to improve the relationship with the noise level reduction at the receiver.     

清镇火车站生活污水治理效果评价

清镇火车站生活污水处理站采用土地法处理工艺,该处理站于2008年10建成运行。为了解该工艺的处理效果,对污水处理前后进行了水质监测。根据污水监测数据分析得出生活污水通过土地法二级处理后可达标排放。该污水处理方法具有造价低,操作简单,运行成本低,处理效果好,使用寿命长的特点,值得大力推广。     

地铁车辆段灰绿耦合雨水系统综合评价体系及应用

针对灰色措施生态价值低和绿色措施经济成本高的弊端,综合考虑环境、经济、工程以及社会等因素,以径流量削减率、洪峰削减率、施工难度、雨水资源利用、施工成本等作为评价指标,采用层次分析法和熵权法确定组合指标权重,基于云模型构建针对地铁车辆段特点的灰绿耦合雨水系统评价体系,并在西安地铁鱼化寨车辆段进行应用实践。研究结果表明,车辆段内灰绿耦合雨水系统方案性能总体优于单独灰色措施和单独绿色措施方案。本文构建的指标以及评价方法可以为后续地铁车辆基地灰绿雨水系统设计运行阶段评价提供参考。     

Connected vehicle penetration rate for estimation of arterial measures of effectiveness

The Connected Vehicle (CV) technology is a mobile platform that enables a new dimension of data exchange among vehicles and between vehicles and infrastructure. This data source could improve the estimation of Measures of Effectiveness (MOEs) for traffic operations in real-time, allowing to perfectly monitor traffic states after being fully adopted. However, as with any novel technology, the CV adoption will be a gradual process. This research focuses on determining minimum CV technology penetration rates that would guarantee accurate MOE estimates on signalized arterials. First, we present estimation methods for various MOEs such as average speed, number of stops, acceleration noise, and delay, followed by an initial assessment of the penetration rates required to accurately estimate them in undersaturated and oversaturated conditions. Next, we propose a methodology to determine the minimum CV market penetration rates to guarantee accurate MOE estimates as a function of traffic conditions, signal settings, sampling duration, and the MOE variability. A correction factor is also provided to account for small vehicle populations where sampling is done without replacement. The methodology is tested in a simulated segment of the San Pablo Avenue arterial in Berkeley, CA. The outcomes show that the minimum penetration rate required can be estimated within 1% for most MOEs under a wide range of traffic conditions. The proposed methodology can be used to determine if MOE estimates obtained with a portion of CV equipped vehicles can yield accurate enough results. The methodology could also be used to develop and assess control strategies towards improved arterial traffic operations.     

增钙高效灰在公路工程中应用的探索

通过实验室及试验路段试验研究,探讨了增钙高效灰在公路工程中的应用。     

对抗条件下155mm车载炮武器系统作战效能研究

155mm车载炮武器系统是一种适应信息化战场要求、效费比高、自动化程度介于自行火炮和牵引火炮之间的新型火炮系统。文章选取美军M109式155mm榴弹炮兵连为主要火力对抗对象，通过建立轮流对抗的作战效能模型，对该武器系统的作战效能进行定量分析。     

促进有效教学的课堂管理调查研究——以广州市交通运输职业学校为例

课堂管理是有效教学的重要保障。本研究关注当前中职学校课堂管理现状，通过实证分析影响良好课堂管理的因素，从中发现有效预防课堂违纪行为的对策。     

Modelling and simulation of transportation system effectiveness to reduce traffic congestion: a system dynamics framework

ABSTRACT

This paper is designed to evaluate and improve the effectiveness of transportation systems and reduce traffic congestion through the use of simulation models and scenario development. A system dynamics framework is used to test and evaluate the alternatives of future strategies for the city of Surabaya, Indonesia. Some factors affecting the effectiveness of transport systems include operational effectiveness and service effectiveness, as well as uncertainty. To improve the effectiveness of transportation systems, several strategies can be implemented, such as subsidizing public transportation, increasing the cost of private vehicle parking fees, raising taxes on private vehicles, and reducing delays in public transportation through scenario development. Scenario results show that, by pursuing these strategies, effectiveness could be improved by 80% as the impact of the increase in operational and service effectiveness, helping to mitigate traffic congestion. Congestion could be reduced to 70% (on average) due to the decrease in daily traffic.