面源红外诱饵对抗红外制导导弹干扰策略研究

面源红外诱饵使用的过程中,合理有效的干扰策略是干扰红外制导导弹的关键,针对这一问题,通过理论分析与仿真模拟相结合得到面源红外诱饵对抗红外制导导弹的干扰策略。首先以红外成像制导导弹为例,介绍红外制导导弹的仿真模型,然后将攻击过程分为锁定前与锁定后,以命中率为评价指标,得到两个阶段下的最佳干扰策略,包括诱饵的最佳释放时机、释放间隔以及载机应采取的机动动作等。     

基于竹筋-钢筋骨架的人工假顶首层充填厚度研究及现场应用

采用简支梁理论、ANSYS软件数值模拟与现场试验相结合的方法,对竹筋-钢筋骨架人工假顶进行了可行性、受力行为、破坏方式与合理设计参数研究。结果表明,竹筋-钢筋骨架人工假顶结构可有效保护上部充填体,最优充填厚度为4.75 m; 采用竹筋-钢筋配筋方式可兼顾采场稳定性与经济效益,减少支护成本约15%。     

煤矿井下碎软煤层旋转导向钻进技术

煤矿井下碎软煤层钻孔轨迹的定向可控对提高钻孔成孔率、减少抽采盲区、提高瓦斯抽采效果具有重要意义。旋转导向钻进工艺对于提高排渣效果、降低事故风险、提高钻进效率具有关键作用，因此实现碎软煤层钻孔旋转导向钻进是未来技术发展方向。分析并总结了目前石油钻井领域旋转导向钻进技术的特点和适用范围，结合碎软煤层钻孔特点，提出了基于内管控制的内控式旋转导向钻进技术思路。     

A route and speed optimization model to find conflict-free routes for automated guided vehicles in large warehouses based on quick response code technology

This paper focuses on exploring conflict-free routes for automated guided vehicles (AGVs) based on quick response (QR) code technology. Intelligent warehousing has become an industrial development trend, with an increasing number of enterprises deploying AGVs based on QR code technology for transportation tasks, especially in large warehouses. Unlike the early single lane path following navigation systems, AGVs using QR code technology can freely switch tracks at any position. And two AGVs can be accommodated side by side. The conditions of conflict-free routes are analyzed firstly when AGVs use QR code navigation system. After that, a route and speed optimization model (RSOM) that aims at minimizing energy consumption and taking conflict-free routes with time windows as the constraint condition is established. Then a branch-and-bound (B&B) algorithm scheme is proposed by altering AGV routes or speed to arrive at schemes with conflict-free routes to complete transportation tasks. Lastly, the effectiveness and validity of our proposed model and algorithm are verified by numerical examples and a case study. The results show that resolving conflicts during route planning for AGVs guided through QR code have advantages over avoiding collision in the running phase by technology and path following techniques in both aspects of solution time and energy. In addition, the established B&B algorithm has better performance than the rapid-exploring random tree (RRT) algorithm in numerical examples. The gaps between them widen as the size of AGVs increases. The research work has potential for application to meet the requirements of AGV development.     

导向钻进非开挖地下管线施工技术的应用

简述了在邯郸市集中供热管道工程中，应用导向钻进非开挖地下管线施工技术穿越中华大街，铺设Φ720mm无缝钢管(内含Φ325mm无缝钢管)，铺设双排Φ377mm(内含Φ219mm无缝钢管)钢制螺旋管获得成功的实例，以对今后同类工程实践提供参考。     

导向钻进非开挖铺管技术在某工程中的应用

介绍了导向钻进法的工艺原理，并结合具体的导向钻井非开挖铺管的工程实例，对施工遇到的一些问题进行了探讨.     

氧弹燃烧灰化法测定聚丙烯中铁的含量

用氧弹燃烧灰化法对有机物中铁的含量进行测定，方法操作简便、快速，实验过程无污染，测定结果可靠。     

浅谈先简支后连续板梁施工工艺

介绍了飞云江特大桥采用先简支后连续工艺设计与施工两方面的概况，并从工序、经济、工期、施工难度、效果及适用范围等方面与简支梁施工进行比较，从而达到推广该施工工艺的目的。     

体外预应力加固简支梁的实际应用

结合工程概况,对张拉控制力的确定、预应力的损失计算、体外预应力的布置及面积估算进行了分析计算,并对其正截面承载力极限状态、斜截面抗剪承载力、挠度进行了分析验算,实践证明体外预应力加固是一种经济、施工简单、效果显著的加固方法,值得推广。