谈客滚船发生事故时的应急措施

客滚船发生事故时,采取合理的措施以减少人员伤亡和财产损失非常重要。文中针对客滚船的结构特征和常见事故的特点,分析事故原因,提出合理处置措施,以期更好地应对事故的发生。     

金融危机下客车行业形势及应对策略分析

通过分析金融危机下我国客车行业的形势，阐述我国客车企业应采取的对策。     

Research and application of non-clay low damage temporary bridging drilling/ completion fluids system

Following the basic theory of protecting gas-reservoirs from damage with the temporary bridging technology, inert calcium carbonate (CaCO3) particles, whose diameter is consistent with the size of pores or apertures in the reservoir, were selected as the bridging agent, and modified resolvable starch was selected as filtration loss reducing particles to form the non-clay low damage temporary bridging drilling/completion fluids system (NLTDFS). Under the simulated condition of the well bottom during real drilling, NLTDFS was used to conduct dynamic and static damage experiments of cores for 48 hours, respectively, and then the experimented cores were permeated with pure nitrogen from the undamaged end to the damaged one to measure their recovery of permeability. The results showed that the permeability recovery rate of the core reached 90% or so, and the damaged depth was less than 1 cm, which demonstrates that NL TDFS has higher temporary bridging effectiveness and lower damage to the gas-reservoir than other drilling fluids system. NLTDFS has been used to drill many horizontal wells, and four of them have obtained high yield of natural gas. The yield of natural gas of LPl well reached 85 X 104 m3/day after completion with the rump pipe. The formation of the stable well wall and smooth drilling led to an API loss less than 4 mL and an HTHP loss less than 15 mL.     

240／275系列机车柴油机传动机构中间齿轮装配破损故障的技术对策

根据沈阳铁路局近年240／275系列机车柴油机传动机构中间齿轮装配破损的数据统计，分析了故障发生的原因，提出了解决问题的技术措施。     

骨膦治疗骨转移癌25例疗效分析

对１９９３～１９９６年住院治疗的２５例骨转移癌患者采用单用骨膦治疗的方法，观察其对骨转移癌患者的止痛效果、骨病灶变化和不良反应。结果∶疼痛完全缓解５例（２０％），部分缓解１１例（４４％），无效９例（３６％），总有效率为６４％；骨病灶控制率为１２％（３／２５）；不良反应仅有轻微恶心。提示∶骨膦是治疗骨转移癌较理想的药物。     

有源滤波器改进控制方法的仿真研究

有源滤波器通常采用常规的三角载波调制PWM控制方法，具有开关频率固定、输出波形谐波分量较少的优点，但响应速度比较慢、精度低。通过增加输入电压补偿来改进三角载波调制的PWM控制方法，可以提高有源滤波器的补偿精度和实时性，减少开关损耗。MATLAB/Simulink仿真验证了改进方案的可行性。     

A rail roughness growth model for a wheelset with non-steady,non-Hertzian contact

This paper presents a model simulating rail roughness growth in which the interaction of a wheelset with the track is considered. The aim is to investigate any possible mechanism for roughness growth due to the coupling between the vertical dynamics, the torsional vibration across the axle of the wheelset and the non-steady contact mechanics. The time-domain simulations are carried out for a driven wheelset on tangent track. Both rigid and flexible are considered with parameter variations for moments of the wheelset, vehicle speeds and wavelengths of initial roughnesses. The 2D non-Hertzian and non-steady contact model used in simulations are based on influence coefficients obtained from a boundary element model. The nonlinear development of the rail roughnesses after millions of wheelset passages is also presented.     

On the scattering of test data and the significance of the standard coefficients ‘dynamic stiffness’ and ‘loss angle’ for hydraulic engine mounts

Based on the test results, a study on the scattering of the standard coefficients c _dyn and δ within the test cycles on a standard testing machine as well as within the samples of a batch of hydraulic engine mounts is performed; furthermore, an estimate for the systematic error caused by the testing machine is given. By a simulated example, the pronounced sensitivity of the response of the engine to the scattering of c _dyn and δ as well as to even small deviations of the hysteresis curves for otherwise identical values of the standard coefficients is demonstrated. As a main result, it is found that the most important source of uncertainty is scattering within the batch, which, in conjunction with the observed sensitivity of the response of the engine, raises the question for the meaningful level of sophistication of a model for predictive purposes.     

On vehicle/track impact at connection between a floating slab and ballasted track and floating slab track's effectiveness of force isolation

When a vehicle runs over the connection between a floating slab track (FST) and ballasted track, wheel/rail impact may occur because of the stiffness difference in the two kinds of track, and thus a transition sector is usually included at the connection to smoothen the stiffness change. This phenomenon is studied by numerical simulation using a time-domain model for an idealised case without such a transition to determine whether it is actually necessary. Calculation results show that the wheel/rail impact load is moderate for a light FST and increases with the vehicle speed or decreasing the natural frequency of the FST. From simulation the wheel/rail parametric excitation is observed, as a result of variation in the stiffness of the FST with the period of the single slab length. The wheel/rail load due to the parametric excitation also increases with the vehicle speed. In addition, good performance of vibration isolation can be seen for the FST in terms of the force transmitted to the infrastructure.     

澳东到新加坡最佳航法

全面阐述了大型船舶从澳大利亚东部到新加坡的航路、航法、潮流及通过该区域的注意事项,并将最近走过此航路的体会进行了汇总,为船舶从澳东到新加坡航行提供了具体详尽的资料和指导。