船用捷联惯导系统在系泊状态下的快速初始对准方法

建立了捷联惯导系统的误差模型，并利用ＰＷＣＳ理论对系统模型进行了可观测性分析。在可观测性分析的基础上提出了一种估计方位失准角ψＵ的方法，从而大大缩短了系泊状态下初始对准时间，提高了对准速度。最后，通过计算机仿真证明了该方法的有效性。     

全电子道岔模块的设计

在铁路信号控制领域，目前应用最广的是6502电气集中和以继电器为执行机构的计算机联锁系统。应用全电子模块设计的计算机联锁系统虽起步较晚，但一定是未来计算机联锁系统的发展方向。本文介绍的全电子道岔控制单元，采用了四线制道岔控制电路，其结构框图如图1所示。     

车侧窗多功能贴膜循环升降系统设计

目前,汽车贴膜就是在车辆前后风挡玻璃、侧窗玻璃以及天窗上贴上一层薄膜状物体,主要作用是阻挡紫外线、阻隔部分热量以及防止玻璃突然爆裂导致伤人等情况发生,同时根据太阳膜的单向透视性能,达到保护个人隐私的目的。但是这种贴膜只能一次性使用,而且为了应对汽车在行驶过程中遇到的各种状况,人们就会相应地对车窗有各种不同的需求。目前一次性车窗贴膜并没有很好地满足人们对车窗各种不同的需求。文中设计一种简单的汽车贴膜升降切换系统,可以根据人们的不同需求,随时随地切换不同功能的贴膜。     

Influence of fastener stiffness mutation in ballastless track on dynamic characteristics of high-speed trainsEI北大核心

Research purposes: The elasticity for the ballastless track structure is mainly provided by the fastening system. During the construction and maintenance of ballastless track on high-speed railway, the incorrect installation and the unreasonable transition between the old and new rail-pads may occur to the fasteners, which will cause a stiffness mutation for the fasteners. Even though this problem can hardly be found under the static condition, it can have a great effect on the stability and safety for the high-speed vehicle operation. Here different conditions for the fastener stiffness mutation are considered, according to the actually measured data. And the influence of fastener stiffness mutation on the dynamic performance of high-speed vehicle and track is calculated and analyzed by using the vertically coupled vehicle-ballastless track-subgrade vibration spatial model and the finite element software ANSYS/LS-DYNA. Research conclusions: The calculation and analysis results show that: (1) When there is a local mutation for the stiffness of fasteners, the maximum and minimum of vehicle acceleration basically keep the same. That is to say, the fastener stiffness mutation has few influence on the stability of vehicle operation. (2) The fastener stiffness mutation has much obvious effect on the wheel load reduction rate, which is related to the safety of vehicle operation. Further, when the train speed is larger than 300 km/h, the fastener stiffness mutation will directly cause the wheel load reduction rate to exceed the standard. (3) This research results can be used to provide a theoretical basis for monitoring the fastener stiffness in construction or repairing and establishing the strict control standards in high-speed railway.     

冰与钢-泡沫夹层结构冲击特性研究

通过对冰与钢-泡沫夹层结构的冲击特性进行有限元仿真建模计算,得出其相关碰撞特性;同时计算得到的接触部位的压强和面积关系与ALIE所规定的压强-面积曲线作比较,确定材料模块选取的合理性。进而为系统研究冰与夹层结构以及船冰碰撞之间的耐撞性提供一定参考意见。     

一种蓄电池充放电电路的设计

应用电容滤波稳压电路原理设计蓄电池充放电主电路,再应用继电器开关原理设计出控制电路,实现不同充电电压的选择。为了加强蓄电池充放电电路的安全性能,设计出一种限压、限流的保护电路。根据蓄电池充放电的基本原理、特性、方法等,设计出一种简易、实用的充放电电路,具有良好的可逆性和稳定性。     

新能源汽车竞争力提升策略研究

通过文献研究、调查研究和实证研究,总结出了影响新能源汽车消费的各个变量,使用SPSS 17.0统计软件对问卷数据进行了分析,得出了影响新能源汽车市场消费的3个关键因素:汽车质量因子、购买成本因子和售后服务因子,并从提升汽车质量、完善售后服务、降低成本几个方面提出了的建议。     

碳酸盐粉煤灰水泥复合胶凝材料浆体的电学特性

采用循环伏安法和交流阻抗法研究了碳酸盐粉煤灰水泥复合胶凝材料浆体的电阻率和交流阻抗等电学特性.结果表明：碳酸盐掺合料能够提高复合胶凝材料浆体的电阻率,碳酸盐和硅微粉惰性掺合料对复合胶凝材料浆体电阻率的贡献率大于粉煤灰和偏高岭土活性掺合料;碳酸盐掺合料降低了表征浆体C-S-H胶凝中导电离子的电容（Cg）;提高了表征复合胶凝材料浆体孔隙率的高频电阻（Rs）,即降低了浆体孔隙率;提高了表征浆体水化程度的低频电阻（Rct）.     

Skin detection method based on cascaded AdaBoost classifier

Skin detection has been considered as the principal step in many machine vision systems, such as face detection and adult image filtering. Among all these techniques, skin color is the most welcome cue because of its robustness. However, traditional color-based approaches poorly perform on the classification of skin-like pixels. In this paper, we propose a new skin detection method based on the cascaded adaptive boosting (AdaBoost) classifier, which consists of minimum-risk based Bayesian classifier and models in different color spaces such as HSV (hue-saturation-value), YCgCb (brightness-green-blue) and YCgCr (brightness-green-red). In addition, we have constructed our own database that is larger and more suitable for training and testing on filtering adult images than the Compaq data set. Experimental results show that our method behaves better than the state-of-the-art pixel-based skin detection techniques on processing images with skin-like background.