基于B/S结构的游乐设施检测管理系统研究

通过对游乐设施检测领域问题和信息系统领域问题的研究，并根据用户需求，采用MVC模式和J2EE技术构造了游乐设施检测管理系统的网络结构和软件体系结构,采用构造的体系结构实现系统时，只需要根据业务需求添加业务组件，实现业务组件的数据输入、业务处理和数据输出．根据游乐设施检测管理系统的特点说明了系统的实现方法和技术.     

基于气缸压缩压力变化的发动机视情冷磨合规范研究

发动机磨合对提高其动力性、经济性、可靠性及延长使用寿命具有重要意义。通过对发动机冷磨合过程中的气缸密闭性变化分析,提出了基于冷磨合过程中气缸压缩压力变化规律的视情冷磨合规范。试验证明,提出的新规范提高了磨合效率和磨合质量。     

Fault tree analysis of fire and explosion accidents for dual fuel (diesel/natural gas) ship engine rooms

In recent years, China’s increased interest in environmental protection has led to a promotion of energy-efficient dual fuel (diesel/natural gas) ships in Chinese inland rivers. A natural gas as ship fuel may pose dangers of fire and explosion if a gas leak occurs. If explosions or fires occur in the engine rooms of a ship, heavy damage and losses will be incurred. In this paper, a fault tree model is presented that considers both fires and explosions in a dual fuel ship; in this model, dual fuel engine rooms are the top events. All the basic events along with the minimum cut sets are obtained through the analysis. The primary factors that affect accidents involving fires and explosions are determined by calculating the degree of structure importance of the basic events. According to these results, corresponding measures are proposed to ensure and improve the safety and reliability of Chinese inland dual fuel ships.     

康德时间哲学论纲

具体阐述了康德时间哲学的内容，分析了康德时间哲学对海德格尔存在哲学的影响，指出康德时间哲学在时间哲学史上的地位。     

中国铁路“走出去”面临的困难及应对建议

从中国铁路走出去的意义出发,分析目前走出去面临的困难、挑战及机遇,从中国铁路走出去战略对策、技术标准、通信信号设备产品、设计标准选择等方面,提出应对措施和建议。     

利用切线特征点对圆柱体的精确测量方法

该文利用切线特征点对圆柱体的精确测量方法和全站仪配合棱镜对晚1柱体定位方法傲了具体比较,然后介绍了利用切线特征点对圆柱体的精确测量方法的理论依据和操作过程.     

CRTSⅡ型轨道板结构设计

介绍了Ⅱ型无砟轨道的主要技术特点.采用当量地基梁模型、三重叠合梁模型、梁-板模型和空间实体模型对Ⅱ型板式无砟轨道结构进行了力学计算,得出Ⅱ型轨道板设计荷载.通过不同的荷栽组合对轨道板的强度、裂缝等进行检算,最终确定轨道板的配筋.简要阐述了轨道板内钢筋绝缘和综合接地方案.可以为Ⅱ型轨道板的结构设计提供指导.     

新型水封爆破除尘技术试验研究

为更快速有效地清除隧道钻爆施工所产生的粉尘，提出“辅助降尘注水孔方案”、“差异水袋布置方案”、“降尘注水孔+差异水袋布置” 3种新的水封爆破除尘技术方案。依托轿顶隧道进行现场试验，得到初始状态下掌子面区域纵、横向特征位置的粉尘质量浓度，CO、CO2、O2、NO2体积分数分布情况，通风条件下纵向特征位置的粉尘质量浓度、CO体积分数随时间的变化规律，3种新型水封爆破方案下掌子面区域纵、横向特征测试位置的粉尘质量浓度、CO体积分数分布规律。经研究得出如下结论： 1）通风10 min内是粉尘质量浓度、CO体积分数下降最快的阶段； 2）新型水封爆破除尘方案的降尘效果明显，3种方案最大降尘比例依次为36.84%、40.85%、65.74%； 3）降尘注水孔对爆破粉尘可起到良好的“封闭”作用； 4）新型水封爆破方案可起到明显降低CO体积分数的作用。     

Experimental investigation into the mechanism of the polygonal wear of electric locomotive wheels

Experiments were conducted at field sites to investigate the mechanism of the polygonal wear of electric locomotive wheels. The polygonal wear rule of electric locomotive wheels was obtained. Moreover, two on-track tests have been carried out to investigate the vibration characteristics of the electric locomotive's key components. The measurement results of wheels out-of-round show that most electric locomotive wheels exhibit polygonal wear. The main centre wavelength in the 1/3 octave bands is 200?mm and/or 160?mm. The test results of vibration characteristics indicate that the dominating frequency of the vertical acceleration measured on the axle box is approximately equal to the passing frequency of a polygonal wheel, and does not vary with the locomotive speed during the acceleration course. The wheelset modal analysis using the finite element method (FEM) indicates that the first bending resonant frequency of the wheelset is quite close to the main vibration frequency of the axle box. The FEM results are verified by the experimental modal analysis of the wheelset. Moreover, different plans were designed to verify whether the braking system and the locomotive's adhesion control have significant influence on the wheel polygon or not. The test results indicate that they are not responsible for the initiation of the wheel polygon. The first bending resonance of the wheelset is easy to be excited in the locomotive operation and it is the root cause of wheel polygon with centre wavelength of 200?mm in the 1/3 octave bands.