上海交通运输结构的灰色关联分析

本文运用灰色系统理论中的关联分析法,建立了上海地区各种运输方式效果与社会经济主要指标之间的关联矩阵,并对发展上海交通运输的各种主要因素进行了初步分析。     

基于古林灰色证据理论的农业产值因素分析研究

用古林法(A.J.K lee)、灰色关联分析(G rey Inc idence)和D-S证据理论相结合而成的AJKG IDS模型,对山东枣庄市农业产值因素进行分析。基本思路是先运用古林法和灰色关联分析法分别得出产值因素权重;再以产值因素为D-S作为辨识框架,以两种分析方法结果输出为基本可信度分配函数,使用D-S理论将信息进行融合,克服单一方法确定权重所存在的片面性,使农业产值因素评价更科学。     

An examination of trends in child sexual abuse investigations in Ontario over time

BackgroundChild sexual abuse (CSA) rates have been declining since the 1990s (Dunne et al., 2003; Finkelhor & Jones, 2004, 2012; Jones et al., 2001). Discrepancies in contexts and measures complicate comparing CSA rates across jurisdictions and studies, and there is limited literature about trends in CSA in Canada.ObjectiveUsing data from the Ontario Incidence Study of Reported Child Abuse and Neglect (OIS), the only source of provincially aggregated data in Ontario, Canada, that describes child welfare investigations, this paper provides information on reported and investigated CSA over the past 20 years.Participants and settingThe OIS uses a file review methodology; information is collected directly from investigating child welfare workers.MethodsA sample of child welfare agencies is selected for the study, and data are collected over a three-month period. Weights are applied to produce annual provincial estimates.ResultsThe rates of investigated CSA in Ontario decreased between 1993 and 2013, from 5.20 (95% CI [3.94, 6.47]) to 1.81 (95% CI [0.97, 2.66]) children per 1000. During this time, the rate of all child maltreatment-related investigations doubled, from 21.41 (95% CI [18.38, 24.42]) to 53.32 ([29.61, 77.03]) children per 1000.ConclusionsUnlike other forms of child maltreatment, the incidence of investigated CSA in Ontario declined since 1993. Substantiation rates for CSA investigations decreased more dramatically than the rate of all CSA investigations, which could indicate a true decline in rate or an inability to accurately identify cases of CSA.     

基于灰色理论的铁矿山企业安全生产主导因素研究

运用普通灰色关联度、灰色绝对关联度、灰色相对关联度的理论,综合分析了某铁矿山企业安全生产中影响事故伤亡率的4大因素：职工安全培训率、岗位变化率、安全管理水平、安全投资.各种灰色关联度分别从不同的侧面刻画了该矿山企业安全生产的现状.通过对计算结果的综合分析,找出了影响该矿山企业安全生产的主导因素,即岗位变化率,而与安全投资的关系不大.因此,尽量减少职工岗位变动,稳定职工队伍,是该企业安全生产中应该注意的重要问题.     

非洲粮食问题浅析

贫困问题是非洲目前最突出的发展瓶颈,贫困的状况有多种表现,最基本的就是粮食问题,解决饥饿半饥饿人口的粮食问题是非洲经济发展的首要任务,本文对非洲粮食问题的表现、原因作了一些分析,并对解决粮食问题提出一些建议。     

基于低碳视角的陕西能源消费与环境污染的灰色关联度研究

以2002—2012年陕西的主要能源消费指标和环境质量指标数据为依据,用灰色关联分析法对陕西能源消费和环境质量之间的关系进行研究,得出陕西能源消费与环境污染之间的关联度是显著的。要实现低碳经济的发展目标,就要改变以往的高消耗、高排放的经济发展模式,优化能源消费结构,提高能源利用效率,切实加强能用管理。     

灰色关联理论视角下的城市群主导性高技术产业领域选择研究

通过构建我国城市群主导性高技术产业领域选择指标体系,采用灰色系统关联模型对区域高技术产业主导领域进行实证研究.研究结果表明:我国城市群高技术产业主导领域存在着很大的差别,区域条件的不同决定了不同地区均有各自优势行业.城市群高技术发展应实施专业化、集群化战略,基于区域优势大力发展高技术产业主导领域,有效规避地区间产业结构趋同;通过构建区域高技术产业枢纽一网络结构,促进形成具有区域特色的高技术产业集群,发挥高技术产业对区域经济增长的拉动作用.     

Incidence and characteristics of injury in under-19 academy level rugby league match play: A single season prospective cohort study

Academy rugby league competition is an important step along the pathway to professional status, but little is known about injury at this level of the game. The aim of this research was to establish the nature, incidence and burden of injury in English academy rugby league. Using an observational prospective cohort study design, and a time-loss injury definition, the injury outcomes of three professional rugby league academies were recorded during the 2017 season. A total of 87 injuries occurred in 59 matches for an overall injury incidence of 85 (95%CI 67–103) injuries per 1000 hours played. The mean severity of injury was 22 ± 19 days resulting in an overall injury burden of 1898 (95%CI 1813–1983) days lost per 1000 hours. The tackle event was the most common cause of injury (77% of all injuries). Forwards sustained a greater proportion of injuries than backs (forwards 67% vs. backs 33% of injuries). Concussion (13 (6–20) per 1000 hours) and ankle sprains (11 (4–17) per 1000 hours) were the most commonly diagnosed injuries. The shoulder joint was the most commonly injured site (17 (9–25) per 1000 hours). The incidence of injury for academy rugby league is similar to senior professional rugby league.     

正确理解半波损失

讨论了数值为π的相位突变和半波损失的区别与联系、光波在介质界面上反射以及在薄膜干涉中产波损失的产生,并纠正了许多基础物理教材对半波损失的错误理解。     

福建沿海船舶事故的灰色关联分析

运用灰色系统理论中的关联分析原理,通过总结福建沿海最近10年的海事资料,计算出其关联度,由此分析福建沿海发生的海事与事故种类、事故船舶大小、事故发生时间和地理位置、事故发生原因等的关系,说明福建沿海海事特点、成因及规律,并提出改善福建沿海海上交通环境的一些建议与措施.