山区公路水毁修复工程难题处理实例

山区公路水毁，其修复工程并不是按原样修复就能解决问题，提出了7种特殊的修复方法，这些方法都收到了较好的效果。     

消除铝热焊剂中气孔的研究

铝热焊缝中的气孔是焊缝中的重要缺陷，一般是由焊接工艺因素造成的，但在焊剂研制过程中，却有可能产生于焊接材料选材的不合理。文章阐述了通过焙烧的方法消除焊剂中的气孔。     

TD型道钉锚固剂的功效

介绍应用ＴＤ型道钉锚固剂，整治九江长江大桥承轨台上松动的锚固螺栓，取得成功的经验。     

Delay Restoration of Single-Track Railway Rescheduling

On the basis of analysis of the principle of delay restoration in a disturbed schedule, a heuristic algorithm for rescheduling trains is developed by restoring the total delay of the disturbed schedule. A discrete event topologic model is derived from the original undisturbed train diagram and a back propagation analysis method is used to label the maximum buffer time of each point in the model. In order to analyze the principle of delay restoration, the concept of critical delay is developed from the labeled maximum buffer time. The critical delay is the critical point of successful delay restoration. All the disturbed trains are classified into the strong-delayed trains and the weak-delayed trains by the criterion of the critical delay. Only the latter, in which actual delay is less than its critical delay, can be adjusted to a normal running state during time horizon considered. The heuristic algorithm is used to restore all the disturbed trains according to their critical details. The cores of the algorithm are the iterative repair technique and two repair methods for the two kinds of trains. The algorithm searches iteratively the space of possible conflicts caused by disturbed trains using an earfiest-delay-first heuristics and always attempts to repair the earliest constraint violation. The algorithm adjusts the weak-delayed trains directly back to the normal running state using the buffer time of the original train diagram. For the strong-delayed trains,the algorithm uses an utility function with some weighted attributes to determine the dynamic priority of the trains, and resolves the conflict according to the calculated dynamic priority. In the end, the experimental results show that the algorithm produces ＂good enough＂ schedules effectively and efficiently in disturbed situations.     

聚合物淬火介质和WGY型淬火剂

介绍了聚合物淬火介质的一些共性特点，对新研制成功并已用于生产的ＷＧＹ型淬火剂的特点及冷却特性进行了描述，并与国内外同类产品进行比较，其结果表明，ＷＧＹ型淬火剂是一种性能良好的新型水溶性淬火剂。     

意大利国铁采用的路基修复新方法

意大利国铁最近已开始实施一项创新方案，旨在修复、改善由高速、重载引起，已出现不稳定迹象的既有轨道路堤(约1200km)。