铁路货运安全管理工作研讨会在石家庄召开

2004年10月27—29日，铁道部运输局在石家庄召开铁路货运安全管理工作研讨会。14个铁路局、青藏公司、特货公司、集装箱公司、北京交大、铁科院电子所、运输所、国家轨道衡计量站参加了会议。     

加强对超期服役的门式起重机的运用管理

通过对门式起重机检测结果的分析，总结出超期服役的门式起重机存在的主要问题及产生的原因，提出为确保超期服役的门式起重机安全运用，应采取及时组织特检、配备监测装置、采用无缝走行轨、加强日常保养与维修等措施。     

铁道部调整部分列车运行图

新增图定旅客列车10对: 北京西～延安T43/6 T45/4次,经由京广、陇海、西延线; 泰州～哈尔滨T157/6/7T158/5/8次,经由宁启、新长、陇海、京沪、京哈(狼窝铺～秦皇岛间经京山线)线,进北京;     

论未来航海通信的新格局

通过对海上无线电通信发展的纵向和横向的比较分析，来预测未来海上全球通信的新模式。     

浅谈汽车工业对塑料橡胶的需求

为适心汽车工业的飞速发展，简要介绍了世界汽车材料的发展趋势，重点分析了汽车工业用塑料及橡胶的发展趋势，对汽车丁业用塑料及橡胶制品的需求量作了预测，同时对汽车工业用塑料及橡胶的前景进行了展望。     

Modified QUICK schemes for 3D advection-diffusion equation of pollutants on unstructured grids

In the framework of finite volume method (FVM), two modified schemes of quadratic upstream interpolation for convective kinematics (QUICK), namely quasi-QUICK (Q-QUICK) and normal quasi-QUICK (NQ-QUICK), for improving the precision of convective flux approximation are verified in 3D unsteady advection-diffusion equation of pollutants on unstructured grids. The constructed auxiliary nodes for Q-QUICK or NQQUICK are composed of two neighboring nodes plus the next upwind node; the later node is generated from intersection of the line of current neighboring nodes and their corresponding interfaces. The numerical results show that Q-QUICK and NQ-QUICK overwhelm central differencing scheme (CDS) in computational accuracy and behave similar numerical stability to upwind difference scheme (UDS), hybrid differencing scheme (HDS) and power difference scheme (PDS) after applying the deferred correction method. Their corresponding CPU time is approximately equivalent to that of traditional difference schemes. In addition, their abilities for adapting high grid deformation are robust. It is so promising to apply the suggested schemes to simulate pollutant transportation on arbitrary 3D natural boundary in the hydraulic or environmental engineering.