航海模拟器客观评分系统的设计

根据航海模拟器客观评分的需要，设计了应用模糊推理进行综合评分的ＡＲＰＡ模拟器客观评分系统的程序。模糊推理的数学模型是以《１９７２年国际避碰规则》为依据而建立的。     

基于VXI总线的控制模块自动检测系统设计

介绍了基于VXI总线的艇用动力监控系统控制模块电路板自动检测系统设计思想，重点讨论了系统的软硬件实现方法、解决了对多种控制模块电路板快速检测和故障定位问题。该系统经实际应用表明，满足部队使用要求，效果良好。     

队列行驶领航车辆尾流的粒子图像测速试验研究

为了研究队列行驶时不同的车间距对领航车辆气动阻力的影响,采用风洞试验方法,分别测量了队列行驶工况下领航车辆和领航车辆单独行驶时的阻力系数.又运用粒子图像测速技术对以上工况中领航车辆尾部纵对称面内的流场进行了测量与分析.结果表明:随着车间距的缩短,领航车辆阻力值降低,降幅最大达41.66%,并且尾部流场的涡的拖曳距离、扩...     

复杂地形环境中电磁波多径传输建模与仿真

分析各种环境效应的产生原理及其计算方法,在此基础上设计一个通用的雷达及雷达对抗电磁波多径传输仿真系统,用于仿真各种环境效应引起的雷达及雷达对抗电磁波的衰减,该仿真系统具有良好的人机交互界面,通过不同的仿真设置可以满足不同的试验需求,从而可以更灵活地支持雷达及雷达对抗仿真试验。     

The impact of metro services on housing prices: a case study from Beijing

Assessment of the impact of metro systems on housing prices is important for financing transport infrastructure via value capture. This paper provides evidence for this relationship, focusing particularly on the effects of metro services, and uses the large city of Beijing, China, as a case study. A spatial error model was applied to 2835 samples of online property sales data obtained in January 2016. Three transport service indicators associated with metro transfers and waiting times were explored: (1) metro headway, (2) access to different metro lines and (3) accessibility to employment opportunities. The results show that areas with more employment opportunities via public transit have higher housing prices than other areas. Shorter metro headways are positively related to housing prices near stations. Housing prices for neighborhoods having access to more than one metro line within 800 m-buffer area are higher than those without access to metro lines, controlling for number of accessible jobs within 30 min. This study sheds light on the importance of metro services on housing prices. It has implications for further research and for the planning policies of metro-dependent cities.

     

基于BP神经网络的SAR干扰效果评估

将BP神经网络引入SAR干扰效果评估过程,根据干扰效果评定诸因素构造合适的指标作为网络输入,网络输出为干扰效果所对应的等级划分,然后利用训练样本对网络进行学习和训练。仿真结果表明,这种方法是可行的,减少了评估过程中人为因素的干扰,使得评估结果更为准确、可靠。     

电动汽车纯电里程试验的主要影响因素研究

随着电动车纯电里程的提升,干扰因素对纯电里程试验的影响也被进一步放大,导致纯电里程测试结果更容易产生较大偏差.文章介绍了纯电里程的分布规律,从能量流角度分析了潜在的影响因素,并重点针对影响转鼓加载的转鼓滑行前的热车时间、磨合里程以及转鼓滑行电机出扭一致性进行了研究.结果表明:转鼓滑行前的热车时间影响滑行时的车辆内阻,易...     

Car use,commuting and urban form in a rapidly growing city: evidence from Beijing

The links between urban form and travel behaviour have been widely studied in the field of travel demand management. However, the existing literature is dominated by case studies from the developed countries. A study of a city in a developing and industrialising country can add some fresh evidence to the debate on the impacts of urban form on travel patterns. Using household survey data from Beijing, this paper finds that aspects of urban form have significant effects on workers' car use and the duration of travel by car in journeys to work, while controlling for socio-economic factors and households’ preferences related to residential location. The sprawling patterns of land development play a negative role in reducing motorised commuting trips and shortening vehicle hours travelled in the current processes of rapid urban expansion and motorisation. Since urban sprawl is greatly influenced by growing market forces, the findings in this paper reveal the negative effects of regulation–liberation of land development management on travel behaviour modification.     

影响西北部分地区农村妇女平均活产数的社会因素分析

本研究用多阶段概率比例抽样法（ＰＰＳ）抽查了５３２４名西北农村妇女的一般状况、婚姻及生育史，并用多元分类分析法分析了影响西北部分地区农村妇女平均活产数的因素。结果表明，妇女教育年限、地域、初婚年龄、丈夫职业是影响妇女平均活产数的显著因素。