二灰土起皮的原因及控制措施

起皮问题在二灰土施工中经常遇到,不但影响施工质量,而且还浪费人力物力,造成不必要的损失.因此在施工过程中,应根据土质情况,积极探索,采取有效的措施,避免二灰土起皮.     

从铁路隧道工程施工质量验收标准谈施工质量控制

国家铁路局发布了2018版铁路隧道工程施工质量系列验收标准,从验收单元划分、验收程序和组织、验收内容和要求等方面进行了全面修订,突出了混凝土、锚杆等原材料的进场检验,加强了初期支护、二次衬砌等隐蔽工程的质量检查,做实了关键工序的质量把控,为铁路隧道工程建设划出了"质量红线"。本文从2018版铁路隧道工程施工质量验收标准主要修订内容、技术特点入手,浅谈铁路隧道施工质量控制,以期对使用者有所帮助。     

2018版铁路轨道施工质量验收标准解读

介绍《高速铁路轨道工程施工质量验收标准》(TB10754-2018)和《铁路轨道工程施工质量验收标准》(TB10413-2018)的编制背景、前期调研情况和修编原则,重点阐述CRTSIII型板式无砟轨道、无缝线路等主要修编内容,对隐蔽工程影像留存提出建议,便于项目参建各方全面掌握验收标准的主要内容和贯彻执行验收标准。     

省域公路网治安卡口机动车缉查系统研究

为提升公安机关对全省公路网在途机动车的监控能力,提出建立省域公路网机动车查缉布控系统,对系统的网络结构、功能结构、交换结构及核心服务模块等进行了设计,并从应用层面对应用模式及警务机制提出了工作建议。     

维他橡胶沥青黏结层在高速公路路面大修工程中的应用

高速公路大修工程采用罩面方案时,新铺面层与旧路面面层间的黏结状况是影响罩面路段路面综合使用性能的重要因素。基于维他橡胶沥青优异的黏结力和弹性变形能力,依托京沪高速公路沂淮江段罩面工程,分别从材料质量、施工工艺、质量控制等方面,分析探讨了维他橡胶沥青黏结层技术要点及其罩面工程中的应用情况,并通过后续观测对其性能进行了验证,结果表明:维他橡胶沥青黏结层在路面大修工程中具备较好的路用性能。研究结果可为类似工程提供参考借鉴。     

机器人滚边技术的研究与应用

本文通过分析机器人滚边工艺及主要其滚边设备,着重研究实际应用中出现的滚边质量缺陷,总结归纳机器人滚边质量的控制方法,为车身制造中机器人滚边零件质量控制提供参考。     

Travel differences by gender for older people in London

As a guarantee of life quality, older people’s travel demand has to be satisfied, so understanding their travel demand is important. An important point to bear in mind is that older people are not a homogeneous group but that distinguishing between older women and older men in their mobility needs and travel patterns is necessary. Older people’s travel demand needs to be investigated from many different aspects, including trip generation, travel time, and mode choice. In this study, the investigation is focused on older people’s trip chaining, including trip chain complexity, tour composition in a chain.     

一种DC-DC变换器的控制策略及仿真分析

PWM变换器是典型的时变非线性系统,本文通过模糊控制策略建立了该变换器精确的数学模型,并对该模型在模糊控制下的特性进行了仿真分析,并对比分析了PID控制的特性。通过仿真试验,验证了模糊控制自身的独特优势,更加深入地研究了该型控制策略的规律特征,为下一步研制样机奠定了理论基础。     

Analyzing the gap between the QOS demanded by PT users and QOS supplied by service operators

This research evaluated the effectiveness of tendered bus public transportation (PT) in improving the attractiveness of that service in order to promote sustainable mobility. This was accomplished by characterizing the gap between the quality of service (QOS) supplied by contract regimes and that which is demanded by passengers. Analysis of a customer satisfaction survey aimed at bus users provided insight into their ranking of 14 QOS parameters while 13 active service contracts were analyzed for their impact on QOS. In-depth interviews with relevant experts completed the complex narrative that is Israel’s policy of privatization in PT. Both qualitative and quantitative analyses helped identify those QOS parameters most in demand by passengers and impacted by contracts. The results show that the gap is minimal, high demand parameters receive increased priority in contracts. In addition this research documented an evolution in the method contracts employed to provide QOS. Late model contracts define an increasingly higher minimum QOS; but also strongly limit the operator’s ability to make service changes. This is a trend which should improve QOS in Israel but reduce the incentive for operator enacted QOS initiatives. Despite its obvious success to date, it might be time to change again the contract regime for the provision of competitive bus services in Israel.     

Experience sampling in and around airports. Momentary subjective wellbeing,airports, and aviation noise in England

We explore the wellbeing of people in and around English airports using real-time data from a large spatial positioning experience sampling dataset (Mappiness). We analyze the association between subjective wellbeing reported in the moment and aviation, in terms of airport location, aircraft noise, and activities within airports. This is the first time that a large Experience Sample Method (ESM) of momentary wellbeing measurements has been used to quantify the associations between aviation and subjective wellbeing. Being within areas of high levels of aircraft noise is associated with lower levels of happiness and relaxation. Those surveyed in proximity to airports report significantly lower levels of relaxation. These findings have important implications to policy. Exploiting the panel nature of the ESM data provides the strongest causal claims to date of the negative association between aviation activities and subjective wellbeing. The Mappiness application also allows us to assess the association between airports and wellbeing on those inside them, and divide activities within airports between those who work there and those who are passing through for travel purposes, as well as the effects of aircraft noise beyond airports. This gives us a broader insight into the range of impacts, both positive and negative, that aviation has on peoples’ momentary wellbeing, which may be used to inform aviation noise mitigation and compensation policies in the future.