基于WebGIS的港口船舶动态可视化系统的设计与实现

为实现海事管理部门通过网络就可以直观、方便、快捷地获取港口船舶动态数据,文中提出构建基于WebGIS的船舶动态可视化系统.系统采用三层的浏览器/服务器体系结构,并结合海事管理业务设计应用功能.在建立港口地理信息数据库和船舶动态数据库的基础上,运用地理信息系统技术、动态Web技术及数据库技术开发系统的服务器端和客户端应用程序,实现在WebGIS上图形化显示和查询港口船舶动态信息.实际应用表明该系统能有效提高海事管理部门的工作效率.     

新能源公交车快、慢充技术路线选择

新能源汽车的发展到底是走快充路线还是慢充路线,是一个广泛争议的话题。笔者认为:快充应是新能源汽车的主要发展方向,慢充是补充。主要体现在几个方面。城市公交客车日平均行驶里程200km左右,一次燃料加注应能满足运行一天的燃料要求,为了保证早晚高峰时段运力,车辆通常会利用中午营运空闲时段或晚上收班后的时间加注燃料。充电是对新能源公交车“加注燃料”,新能源车为动力电池充电有快充和慢充,是采用快充还是慢充,要看具体情况。     

上清寺、两路口区域交通研究

上清寺、两路口区域是重庆市主城区交通拥堵最为严重的区域之一。该文基于详实的数据分析和现场调研,总结造成该区域交通拥堵的八个诱因,从现状优化、局部和区域交通组织三个层次对区域交通进行了方案分析评价,该文的研究思路及操作方法对缓解区域交通拥堵、推进建设"畅通重庆"建设均有积极意义。     

道路设计中若干问题探讨

该文对影响和制约道路工程设计的若干问题,如路网规划、水系规划、村镇道路技术标准的选取、新材料和新技术的推广应用、生态设计等进行了探讨,并提出若干建议。     

《船舶安全检查管理系统》研制技术

我们研制开发基于Internet浏览器进行《船舶安全检查管理系统》应用软件主要由公司安全大检查，PSC检测，FSC检查三个子系统和用于《船舶安全检查管理系统》管理的管理员设置四大块组成，公司安全大检查，PSC检查，FSC检查三个子系统分别具有船舶安全检查，跟踪，监控，整改，反馈，分析及统计等多种功能，管理员设置子系统具有对《船舶安全检查管理系统》中的用户，船舶，船队，港口进行添加，删除或修改属性等主要功能，该系统界面友好，操作简便，有利于船舶完全技术管理的科学化，系列化，业务化和自动化，具有广阔的推广，应用前景。     

宋代海船的占籍、保甲和结社制度述略

宋代是我国海外贸易迅速发展的时期,但是宋朝政府一般不从事海外贩运活动,海外贩运都由私人经营,民间海上航运业迅速崛起.然而,宋代又是封建专制主义不断强化的时代,封建政权为了控制和垄断海外贸易,对私人海外贩运活动的各个方面都要加以干涉,严加管制,其中海船的占籍、保甲和结社制度就是为了加强对民间海上航运业的控制而出笼的.     

A Review of Buffeting Loading on Bridge Decks

The strip assumption is the basis of current buffeting analysis. However, the strip assumption has limitation in describing the buffeting load on a line-like structure. The validity of strip assumption was presented and an empirical 3-D aerodynamic admittance was proposed to describe the lift on streamlined decks. The relations between the 3-D admittance and Sears function are depicted.     

Stress Field Analysis of Carburized Specimen and Its Numerical Simulation

IntroductionCarburiZingiswidelyaPPiedheattre8boellttechnologyinindustry.Duringcarburizing,acasewithcarboncontellthigherthanthatofthecoreisformd;andaftethecarburzedmachinepwtbeingquenched,sdsehardenedlayeconsistedmainlyofmartensite,aswellasresidualstfOssfieldappearinit.Theresidua1stressfieldofcarburizedsteelanditsinfluenceonfatiguestrengthhavebeenstudiedexPerimenally["'],whilefewrePortscanbefoundaboatnumericalsimulationofresidualstressfieldincarburizedsPecmenaswellasitsinstataneousstressdist…     

后置发动机客车噪声源的识别

应用相关分析与谱分析理论，建立了后置发动机客车噪声源识别的多输入单输出模型。运用该噪声识别模型及所介绍的测试分析系统，对GZ6921型后置发动机客车噪声源进行了识别。识别及分析结果表明，冷却风扇噪声是GZ6921型客车的主要噪声源。     

Multi-state supernetwork framework for the two-person joint travel problem

Most travel behavior studies on route and mode choice focus only on an individual level. This paper adopts the concept of multi-state supernetworks to model the two-person joint travel problem (JTP). Travel is differentiated in terms of activity-vehicle-joint states, i.e. travel separately or jointly with which transport mode and with which activities conducted. In each state, route choice can be addressed given the state information and travel preference parameters. The joint travel pattern space is represented as a multi-state supernetwork, which is constructed by assigning the individual and joint networks to all possible states and connecting them via transfer links at joints where individuals can meet or depart. Besides route choice, the choices of where and when to meet, and which transport mode(s) to use can all be explicitly represented in a consistent fashion. A joint path through the supernetwork corresponds to a specific joint travel pattern. Then, JTP is reduced to an optimization problem to find the joint path with the minimum disutility. Three standard shortest path algorithm variants are proposed to find the optimal under different scenarios. The proposed framework further indicates the feasibility of multi-state supernetworks for addressing high dimensional problems and contributes to the design of a next generation of joint routing systems.