利用关系数据理论改进装备测试记录存储方法的研究

目前海军装备测试记录的存储大多采用文本文件的形式,不利于数据共享。为解决这一问题,改进原先的存储方法,提出了数据库存储形式,讨论了其开发步骤,并针对应用背景,重点提出了通过现有存储方式的设计文档及相关代码获取设计的需求分析、通过模式分解将测试项目进行划分、通过数据依赖公理验证分解前后是否等价的数据库设计方法,最后通过一个实例对数据库应用系统的开发过程进行了详细说明。与文本文件存储方法相比,数据库存储形式具有利于数据共享、提高数据查询效率、便于装备管理的优点。     

“助学·励志·强能”构建高校贫困生立体帮扶模式

高校贫困生是一个特殊的群体,贫困生的消极心态不仅直接影响学习效率和精神面貌,而且极易造成人格的不健全和偏执心理。关注和加强贫困大学生思想政治工作,激励贫困大学生成长成才,是我们教育工作者的首要任务和职责。文中以广东交通职业技术学院谢强(化名)同学的成长经历为主要案例,介绍了学院基于"助学、励志、强能"全方位帮扶贫困生的工作方式和经验。     

Are multi-car households better suited for battery electric vehicles? – Driving patterns and economics in Sweden and Germany

Battery electric vehicles (BEVs) could reduce CO₂ emissions from the transport sector but their limited electric driving range diminishes their utility to users. The effect of the limited driving range can be reduced in multi-car households where users could choose between a BEV and a conventional car for long-distance travel. However, to what extent the driving patterns of different cars in a multi-car household’s suit the characteristics of a BEV needs further analysis. In this paper we analyse the probability of daily driving above a fixed threshold for conventional cars in current Swedish and German car driving data. We find second cars in multi-car households to require less adaptation and to be better suited for BEV adoption compared to first cars in multi-car households as well as to cars in single-car households. Specifically, the share of second cars that could fulfil all their driving is 20 percentage points higher compared to first cars and cars from single-car households. This result is stable against variation of driving range and of the tolerated number of days requiring adaptation. Furthermore, the range needed to cover all driving needs for about 70% of the vehicles is only 220 km for second cars compared to 390 km for the average car. We can further confirm that second cars have higher market viability from a total cost of ownership perspective. Here, the second cars achieve a 10 percentage points higher market share compared to first cars, and to cars in single-car households for Swedish economic conditions, while for Germany the corresponding figure is 2 percentage points. Our results are important for understanding the market viability of current and near-future BEVs.     

Understanding job-housing relationship and commuting pattern in Chinese cities: Past,present and future

There are debates about whether job-housing balance and short commuting distances could be achieved through government intervention in Western countries. However, few studies have been carried out in developing context. The present study aims to fill in this knowledge vacuum by studying how China’s changing socio-spatial context, particularly the spatial ideas of danwei, influences job-housing relationships and commuting patterns from a historical perspective. The results clearly show that the dominant trend in commuting patterns in Chinese cities has changed from intra-danwei commuting before 1978 to reverse commuting from the city center to the inner suburbs in 1978–1998, to long-distance suburb-to-city commuting since 1998. The findings suggest that government intervention could be helpful in achieving shorter commute in China, and that urban planning and policy that promote mixed land-use and job-housing balance should be considered. Some limitations of government intervention are also discussed.     

都市圈背景下深圳轨道交通发展战略研究

国际大都市圈在发展过程中,都结合空间结构和交通需求变化,制定相应的交通发展战略。港深莞惠地区已经初步具备建设世界级都市圈的条件,需要根据空间发展态势,提早研究交通发展战略。首先,从空间结构上解析其港深莞惠都市圈双核双通勤圈的结构特征;其次,通过分析未来都市圈人口岗位的变化,研判关键地区和走廊的高峰期通勤交通压力;最后,研究提出深圳轨道交通一体化发展战略以及基于都市圈空间结构重构轨道网络的策略性建议。     

岸基滑车用于开敞式码头加强系缆设计要点

岸基滑车应用于开敞式码头加强系泊具有明显优势。通过研究国际规范和船舶资料,给出了岸基滑车的设计载荷等主要设计参数,并阐明码头系泊布置方面的优化形式。研究结果对于开敞式码头设计和系泊安全研究具有参考价值。     

基于系统动力学的国际陆港仿真研究

以昆明国际陆港为例,采用定性与定量相结合的研究方法,基于系统动力学仿真软件,对国际陆港与昆明市的经济系统进行建模仿真,系统研究了陆港与城市经济系统发展的主要影响因素及趋势特征,结果验证了该模型在国际陆港与城市经济系统研究方面的有效性.     

滨海旅游城市路网规划——以海南国际旅游岛先行试验区为例

滨海旅游城市往往独具特色,其路网规划需在综合分析城市区位、功能布局、旅游资源的分布、自然地理等因素的基础上,以绿色交通理念为指导,构建外畅内达、特色鲜明的路网格局,充分体现路网跟城市布局及旅游的结合.因此,以海南国际旅游岛先行试验区为例,提出了典型的滨海旅游城市路网规划策略,并制定了相应的路网规划方案,可为滨海旅游城市的规划提供一定的参考与借鉴.     

基于模糊ISM的可持续城市物流发展因素分析

城市物流在现代城市经济发展中占有重要地位。可持续城市物流发展因素已成为了城市物流可持续发展研究首要问题之一。综合可持续城市物流发展的15个因素,运用模糊ISM方法将可持续城市物流发展因素体系构成1个多级递阶模型,并以南昌市可持续城市物流发展为案例进行研究。研究表明：南昌市可持续城市物流发展因素之间关系符合实际情况,所建立的因素结构分析模式可为具有南昌特色的城市物流可持续发展提供指导和借鉴。