百事通驾驶员 爱岗敬业 无私奉献永不停息——记北京公交集团客一分公司郑立永

郑立永是北京公交集团客一分公司第十车队专131路的驾驶员,自工作17年来,5、16和50万这几个数字一直陪伴着他,这些数字分别代表着他服务过的公交线路条数、获得的荣誉称号个数和安全行车里程数。在他的许多光荣称号中,最引以为傲的是中国共产党党员,胸前闪耀的党徽引领他不断前进。     

Toward using social media to support ridesharing services: challenges and opportunities

Ridesharing has been attracting increasing attention from both academia and industry. One of the challenges posed by the study of ridesharing is to identify the most valuable information for improving the ridesharing decisions taken by participants. Another challenge is to use harvesting techniques to extract specific types of travel-related information. Many methods have been developed by the community in order to solve these issues. However, due to a lack of information sharing between different transit authorities and the difficulty of identifying subjective perceptions of the experience of ridesharing, understanding and evaluating how social media data might support or obstruct goals for mobility, safety and environmental sustainability in ridesharing is a difficult task. In this survey, we first analyze the literature on ridesharing with a focus on the properties and model of service, and introduce a framework to describe the major components required for a ridesharing service. Then, we illustrate the potential value of information extracted from social media and present the rationale for harvesting travel-related data. Finally, we detail some possible directions and different approaches for using social media data, and highlight their assets and drawbacks.     

Online channel strategies under different offline channel power structures for the Belt and Road of China

ABSTRACT

This paper explores the online channel strategies adopted by Chinese manufacturers with regard to the Belt and Road. It also investigates the effect of offline channel power structures and maritime transportation costs on online channel mode selection and pricing strategies. The offline channel power structures are classified into three types, namely, Chinese manufacturer Stackelberg (MS) structure, vertical Nash (VN) structure, and foreign retailer Stackelberg (RS) structure. Furthermore, a game model is developed among the Chinese manufacturer, foreign retailer, and cross-border e-tailer to investigate the interactions among offline channel power structures, maritime transportation costs, and Chinese manufacturers’ online channel mode selection. The results show that Chinese manufacturers’ preferences for the online agency selling mode increases correspondingly with the decrease in their market position and bargaining power. Moreover, foreign retailers can obtain higher profits in the online agency selling mode under the VN structure. However, the level of profit for foreign retailers depends on the intensity of their competition with cross-border e-tailers under the MS and RS structures. Finally, consumers in countries along the Belt and Road can obtain a higher surplus in the online agency selling mode under all of the structures.     

锰对工人血清胆碱酯酶活性和尿香草扁桃酸含量的影响

为探讨职业性锰暴露对工人血清胆碱酯酶活性和尿香草扁桃酸(VMA)水平的影响,对55名锰粉加工工人、55名冶炼工人和55名对照工人进行了调查.结果显示,锰粉加工作业环境空气锰尘中MnO2几何均数为1.96 mg/m3(0.17～22.24mg/m3),样品超标率为88.9%;冶炼作业环境空气锰烟尘中MnO2几何均值为0.65 mg/m3(0.06～6.67mg/m3),样品超标率为93.3%.锰粉加工和冶炼组头晕头痛、睡眠障碍的主诉率明显高于对照组(P＜0.01),锰粉加工组血清胆碱酯酶活性明显增高(P＜0.05),提示这可能是锰的早期神经毒性所致.     

货车转向架悬挂参数与运行性能研究

简要阐述了货车转向架的简化抗弯、抗剪、抗菱参数的概念,分析了其对车辆直线横向稳定性和曲线通过性能的影响。给出了H型构架式、三大件式转向架和径向转向架的简化抗弯、抗剪、抗菱刚度的计算公式。以此为基础,分析了我国货车转向架的发展与运用概况。最后提出了对货车转向架研制和进一步发展的建议。     

关于区域交通枢纽规划的建议

随着城市轨道交通的发展，上海市即将形成九大区域交通枢纽，根据城市总体规划要求，拟将地铁站、轻轨站、公交车终点站、出租车站集合成一个大型公共交通综合换乘枢纽。高起点规划好这些中心，对疏散地区交通压力、提升地区功能具有重要作用。下面以虹口足球场地区为例，就高起点规划、高水平建设区域交通枢纽中心提几点建议和设想。     

三孔联体斜交框架立交桥顶进施工方法

菏日铁路复线上的三孔联体框架式立交桥施工工程 ,采用整体顶进二股道的施工方法 ,线路加固用纵挑横抬法 ,并采取了防止线路横移措施 ,缩短了工期 ,圆满地完成了施工任务。     

海浪中船舶运动的可视化技术

介绍了船舶在海浪中运动的可视化技术。给出了可视化设计过程的流程图，并讨论了建立船舶模型的可行方法和三维波浪模型的数学模型，以及如何应用OpenGL函数库来生成船舶在海浪中运动的动画。在讨论可视化技术时，使用了具有平台独立性的OpenGL图形库。     

应用机器视觉技术研制符合技规要求的综合动态检测车

铁路检测设备已经由单项检测发展到多项检测、由静态检测发展到动态检测、由接触式检测发展到非接触式检测，由低速运行状态检测发展到高速运行状态检测。日本的综合检测列车是这种趋势的典型代表，支撑这种发展趋势的核心技术是机器视觉技术。我所承担的铁道部重点课题《非接触式接触线动态检测设备研制》，2005年4月，在福州供电段青州网工区、沙县网工区接触线磨损实测，     

舰载文电处理系统构件化设计与实现

针对当前舰载文电系统开发效率低、灵活性和健壮性较差的问题，提出一种基于CORBA的舰载文电系统构件化设计与实现方法，分析和比较采用此方法所实现的新型文电系统的特点。