铁路工务大修企业定额及工费标准研究

铁路工务大修企业建立和完善内部劳动定额,实现企业内部成本核算和控制,是基层生产站段需要研究和解决的问题。此文在阐述编制企业内部定额面临几个主要问题的基础上,通过分析与研究,提出铁路工务大修企业建立企业定额的策略。并以某大修工程几个主要工作项目实际消耗的工日与工程预算定额进行对比,分析存在差异的原因。以此提出应追踪劳务市场动态,确定动态的人工工费标准。     

交流480轨道电路防雷研究与应用

对焦柳南线非电化区段交流480轨道电路防雷进行了研究,分析设备现状及雷害成因,并针对防雷措施进行了一系列的实践,达到施工简单、费用经济的避雷效果,减少了雷电对交流480轨道电路的损害。     

Transient design waves for green-water loading on bulk carriers

The wave surface profiles associated with extreme relative motion between a slender stationary vessel and the adjacent wave surface are investigated for long-crested head seas. The methodology is based upon an established statistical relationship for a Gaussian random process which indi-cates that in the vicinity of an extreme event the most probable shape of the time history approaches that of the autocorrelation function. Attention is given to the relative motion at a longitudinal position which is representative of the No. 1 hatch cover location on a bulk carrier. Second-order corrections to the wave surface profiles are used to provide estimates of nonlinear relative motions. It is shown that extreme relative motion at the hatch cover location is associated with the vessel encountering a steep-fronted wave with pronounced asymmetry in the horizontal and vertical directions. In order to evaluate the exceedence probabilities, it is hypothesized that the peaks of the nonlinear relative motions are closely correlated with the peaks of an underlying linear process. The overall methodology is applied to an investigation of relative motion exceedence probabilities for vessel lengths of 250 m and 300 m over a range of survival seastates. Received: July, 1999 / Accepted: November, 1999     

LBC6130A82型三轴客车底盘的研制

介绍LBC6130A82型三轴客车底盘的技术要点及技术参数。     

Research on the calculation method of penetration resistance of bucket foundation for offshore wind turbines

The cost of foundations for offshore wind turbines constitutes approximately 35% of the total cost of an offshore wind farm. The bucket foundations show significant potential due to their superior transportation and installation efficiencies compared to pile foundations, leading to potential cost savings for the foundation of up to 30%. For a bucket foundation to be installed successfully, the penetration resistance must be predicted. However, there is currently a lack of clarity on how to select a suitable calculation method for penetration resistance based on known geological parameters to guide construction. In order to evaluate the current methods of calculation for bucket foundation penetration resistance, this study combines theoretical calculation methods with two sets of practical measurement data from the field. The calculation methods of penetration resistance for bucket foundation are first reviewed and categorized. The applicability range of each method and the parameters needed for calculation are given. Next, according to the measured data in the process of penetration of bucket foundation on site, the evolution of compartment pressure, tilt angle, resistance and required suction in the process of penetration are analyzed. Finally, the reviewed methods are compared to the results of two practical projects in order to analyze the differences between them and make recommendations for the calculation technique. The findings can be used as a guide for calculating the bucket foundation's penetration resistance in complex geological conditions.     

基于船舶安全航行研究

船舶在航行过程中应遵循安全、经济的原则,其中安全尤为重要。文中就如何保证船舶安全航行作了一些深入的调查与研究,得出了保持正规了望、正确使用航海雷达、严格落实值班制度和尽量避免紧迫局面等几个切实可行的方法,以期引起航海者的高度重视,极其谨慎地驾驶船舶,以避免出现碰撞事故。     

以道路运输比较优势促进运输竞合的策略研究

文章以道路运输业面临的挑战和机遇为背景,分析了当前道路运输的现状与存在的问题,阐述了道路运输业所具有的比较优势,并提出了利用道路运输比较优势实现运输竞合的策略。     

弹簧安全阀的常见故障及其处理

分析了中、低压锅炉及压力容器上弹簧安全阀的常见故障及产生原因 ,提出了相应的解决措施。实践证明这些措施是有效的     

浇注式沥青混凝土在上海长江大桥中的应用研究

介绍了浇注式沥青混凝土上海长江大桥的基本情况,分析了级配、油石比、结合料对浇注式沥青混凝土的性能影响,并在实体工程中应用。     

远洋级公务船与调查船抗风力研究及探讨

通过对比IMO气象衡准和中国船舶行业CB/T3526-94等抗风标准,分析相互之间的主要差异和关键要素,并针对国内远洋级公务船和调查船开展抗风力计算与衡准方法研究,首次提出用“特殊抗风稳性GM限制线”来指导船舶设计和操作。