液压锚机齿轮质量问题探讨

针对船舶液压锚机在检验过程中暴露的质量问题,从齿轮表面质量、齿轮啮合不正常磨损及齿轮啮合噪声等4个方面进行讨论分析,提出相应的解决措施。     

Cruise activity and pollution: The case of Barcelona

One of the main causes of mortality worldwide is air pollution. To tackle this problem, local, regional and national governments have implemented policies to reduce emissions from industrial and on-road sources. However, when these policies are being designed, shipping emissions are often overlooked. There has been a drastic increase in the demand for cruises and its economic relevance is also growing in port-cities. Barcelona is Europe’s leading cruise port, and it is located near the centre of the city. In this context, this paper analyses the impact of cruise ships in the air quality of the entire city of Barcelona using a dataset with information about pollutants and the number of cruises arriving to the port. We show that there is a direct impact between cruises staying at the port and city pollution. Additionally, the size and age of the cruise also affect air quality. The larger (or newer) the cruise is, the higher the emission generated. Moreover, our simulations show that the whole city is affected by these emissions.     

高速铁路通信工程施工质量验收标准解读

新修订的《高速铁路通信工程施工质量验收标准》TB 10755于2018年发布,2019年2月1日正式实施。本文结合工程实际,综合考虑技术进步、管理水平发展、国家相关法律法规以及有关标准的更新等因素,总结设计、施工、监理等单位的经验,从标准修订的背景,新标准整体上的变化,以及各系统的细节变化等方面,对新验收标准进行了详细解读。     

Customers’ selections between premium electric taxis and liquefied petroleum gas taxis

Reducing roadside emissions is a common challenge in metropolitan cities. In Hong Kong, conventional liquefied petroleum gas taxis are one of the main contributors to roadside emissions as they operate on the streets 24 h a day with a long daily driving mileage. Moreover, these taxis suffer from a severely poor service reputation. To enhance the environmental friendliness and service quality of the taxi industry, this study explores the market potential of operating premium electric taxis in the dispatching mode. A stated preference survey was conducted to 1410 taxi customers about their taxi-riding choices between premium electric taxis and conventional liquefied petroleum gas taxis. In total, 5640 observations were obtained and used to develop a series of binary logistic regression models with different model formulations for the determination of the significant factors influencing customers’ selections. The findings indicate that walk time to and wait time for taxis were the most critical concerns to the customers, and they were more willing to take premium taxis if their journey distance was longer and their desired improvement on taxi service quality was greater. The socio-demographic status of taxi customers also influences their choices. The associated policy implications are discussed for promoting taxis with better service quality and fewer roadside emissions. The findings provide some policy insights to other international cities that have a similar taxi market to Hong Kong.     

A Football Field Lost Every 45 Minutes: Evaluating Local Capacity to Implement Louisiana's Coastal Master Plan

As Louisiana continues to experience substantial coastal wetland loss—at the rate of a football field every 45 min—and multiple disasters, state and federal officials struggle with implementing restoration plans in this highly productive ecosystem. The 2007 Louisiana Comprehensive Master Plan for a Sustainable Coast is the first large-scale restoration plan in the United States to incorporate hazard mitigation. However, there is no mandate for local governments to adhere to this plan. Building upon the planning quality and evaluation literature, this study analyzes comprehensive land use plans in Louisiana's coastal zone to systematically assess the quality of the plans within the context of a non-mandated, $50 billion large-scale state restoration plan. Results indicate a great disparity in plan quality; a majority of the local governments lack the capacity to implement the nonstructural programmatic elements of the state's plan. The study concludes with a discussion and recommendations for practice and future research.     

石料质量综合评估法在海外防波堤工程中的应用

针对海外防波堤工程中经常遇到的石料质量不能满足技术规格要求的问题,对国外规范和文献中关于石料质量评估方法的研究成果进行分析。通过将石料质量综合评估法在海外某实际工程中进行应用,并结合设计方案采取施工措施,解决了该工程的石料来源问题。     

磁耦合谐振式WPT系统传输特性影响因素研究

文章对磁耦合谐振式WPT系统传输特性的影响因素开展了研究与分析,分析了基于SS结构的磁耦合谐振式WPT系统的传输效率模型,基于此模型研究了品质因数对系统传输特性的影响;分别研究了趋肤效应与线圈结构对传输特性的影响,并根据趋肤深度公式分析了多芯情况下的线圈品质因数计算公式,研究结果表明:传输效率与品质因数成正比,且品质因数随着导线芯数的增加而增加;圆柱型螺线管构型具有传输距离远与传输方向性好等优点,更适用于磁耦合谐振式WPT。最后搭建了实验平台,验证了理论分析的正确性。     

珠海泥湾门大桥桩基施工质量事故的分析处理

本文主要分析泥湾门大桥桩基基身混凝土的质量缺陷和桩长不足两种质量问题产生的原因和处理方法。     

浅谈公路工程的监理工作

介绍了在公路工程监理过程中 ,在质量、费用、进度这三方面控制时应注重的工作内容     

新型双层空调旅客列车卫生学评价

为了解新型双层空调客车内卫生学状况，对行驶中的硬座和软座车厢的上、下层进行了卫生学调查。每层设前、中、后3点，司机室设1点。结果显示：两类车厢及司机室内微小气候指标中湿度、硬座车厢空气中CO2平均浓度超过国家卫生标准；软座车厢空气中CO2平均浓度叶未超标，但样品达标率人氏于硬座车厢，上层车厢的噪声强度高于下层车厢，并超标，硬座车厢噪声高于座车厢。