城市出租车行业群发性事件风险预警方法

为实现对城市出租车行业的实时监测和预警,避免或减轻出租车行业群发性事件造成的不良影响,从出租车市场供给需求指标、市场价格与经营成本指标、市场经营环境指标、相关政策指标四个方面构建出租车行业群发性事件风险评估指标体系,利用层次分析法和加权平均法建立相应的风险评估模型,提出风险预警级别划分标准,并采用累积频率曲线法确定各风险等级的阈值。基于安徽省出租车行业近年来的出租车群发性事件对模型进行了标定,并以安徽省蚌埠市为例进行了应用验证,结果表明本文提出的方法具有较好的实用性,可实现对城市出租车行业群发性事件的风险预警和风险源的识别。     

中国船舶工业技术效率分析

利用数据包络分析方法,对2002年~2004年各地区船舶生产技术效率及其变动进行了实证分析。得出的结论主要有:历年来河北、辽宁、上海及贵州等地区均表现出了较高的技术效率,同时绝大部分地区船舶生产处于规模报酬递增的阶段;船舶生产规模和其技术效率之间存在正的相关关系;若干地区存在船台及船坞等资本的过度供给。     

用新陈代谢极限学习机实现电池健康状态估算

针对因电池内部电化学反应的复杂性、算法泛化性差或可用已知数据量少导致的锂离子电池SOH估算精度下降的问题,提出使用极限学习机(ELM)构建强泛化性电池退化状态模型来描述不同电池的共性退化规律;引入新陈代谢机制来更新退化状态模型的输入数据进而实现对SOH的新陈代谢估算,在保证估算精度的同时降低对输入数据量的需求.利用两种...     

论产业集群与区域经济发展

产业集群的发展已成为当今世界经济中一种引人注目的现象,"培植主导产业、形成产业集群"正日渐成为各地参与区域经济发展的理念。随着产业集群的不断发展,相应的理论体系不断完善,对地方区域经济的发展起到关键的作用。文章从产业集群的特征、作用进行阐述,并对如何培育产业集群提出了相应对策。     

在用工业管道减薄形式分类及其安全状况等级评定

简要分析了工业管道减薄的原因,对使用缺陷的轴向长度来区分减薄类型进行探讨.减薄管道表面状况较为粗糙,曲率较大,当使用测厚仪测厚有困难时,可以用超声波探伤仪来进行测厚.遵照相应规范标准,根据具体减薄情况确定其安全状况等级和检验周期.     

Characteristics and consequences of the cruise traffic seasonality on ports: the Spanish Mediterranean case

Cruise traffic is a maritime business and tourist typology that has expanded significantly in the past two decades. The seasonality of the industry affects maritime traffic, generating negative effects for the primary stakeholders involved in the configuration of a cruise itinerary. This article focuses on cruise traffic seasonality from the perspective of cruise ports by analysing a sample of 13 ports on the Spanish Mediterranean coast. The variable used was cruise passenger movements during the period 2000–2015. The main objective of this article is to analyse cruise traffic seasonality in order to identify a pattern, classify through a cluster analysis, and identify the changes in seasonality during the period. Specifically, a threefold analysis has been performed, with the additional goal of providing a series of counter-seasonal suggestions and strategies to apply in the management of cruise ports. First, the seasonality pattern of each port was determined. Second, a cluster analysis was conducted to classify ports into clusters with homogeneous seasonality patterns. Third, an analysis was conducted to identify the changes in seasonality during the period of analysis using the coefficient of variation and the Gini coefficient. This article concludes the existence of two port clusters with different seasonal patterns.     

Environment–person interactions enabling walking in later life

Traditionally, theory suggests the ageing individual is strongly influenced by the environment and has difficulties in overcoming distance and space. Recently, however, theory has moved to suggest that older people possess greater agency, being more capable of selecting and mastering their environments and spaces according to their needs and preferences. This paper suggests that both opposing theories are correct for differing groups. Observations and surveys of older people (n = 365) in public space examined how far person–environment agency is present in active use of outdoor space, measured by confidence to use and explore space, in three locations (urban shopping centres, suburban residential area and an area of shared space). In all three areas, dominance of the space was associated with being male and having higher levels of reported health, confidence and higher socio-economic status. Only 11% of participants walked at least as fast as the UK department for transport guidance on crossing speeds.     

道路车辆清障救援服务标准体系研究

道路车辆清障救援服务是保障道路运输安全畅通的重要组成部分,是道路交通安全保障失效情况下的一种补救措施。文中阐述了国内外道路车辆清障救援行业现状,分析了我国道路清障救援行业存在的问题。在此基础上,提出了道路车辆清障救援服务标准体系架构,以促进我国清障救援社会化、规范化、专业化、市场化。     

无风撑系杆拱桥健康监测系统设计

随着我国桥梁技术的不断发展以及人们对美观要求的不断提升,各种新颖桥梁被设计建造出来,针对大跨径桥梁有必要建立与其配套的健康监测系统.结合中承式无风撑系杆拱桥受力特点、振动特性、易损部位,设计监测系统硬件布设方案;该监测系统包括硬件布置、数据采集、数据传输、数据存储、状态评估以及预警信息发布.基于监测系的采集数据,可对桥...     

我国汽车产业集群的区域布局研究

通过对产业集群概念的阐述,分析了汽车产业集群的竞争优势,提出了我同汽车产业集群区域的选择原则及具体的产业集群区域布局方案,并对我国的六大汽车产业集群区域的成长性进行了分析。