钢管桩支护法明挖基坑施工方法简介

介绍钢管桩支护法进行明挖基坑的特点、施工方法以及其技术保证措施.     

摩托车发动机齿轮脱档和异响问题的分析与解决

对退回的有问题齿轮进行分类分析,齿轮脱档主要原因是副2档齿轮的3个爪不等分,当摩托车爬坡时,会使3个爪承受轴向推力而脱档;齿轮异响主要原因是齿轮精度问题。通过改进工艺及质量控制,使这些问题得到了解决,质量成本进一步下降。     

Optimization of the Construction Scheme for a PBA Metro Station Adjacent to an Existing Metro Tunnel北大核心CSCD

The Olympic Park Station crossing the existing Datun-Road tunnel covers a long distance and closely approaches an existing metro tunnel. Initially, the PBA construction method was adopted with eight pilot tunnels. In light of the tunnel group cavern effect and the surrounding soft silty clay with abundant water, the construction risks were very. Optimization of the metro station construction scheme was conducted, and the four pilot tunnels at the downside were cancelled and replaced with long drill hole grouting piles. Construction technology for a large-diame-ter pile for a bored pilot tunnel was adopted based on the engineering characters of the PBA method using four pilot tunnels. Monitoring on the Datunlu tunnel structure was performed during metro station construction and the results indicate that the construction scheme for the station’s main structure was rational; the new construction technology ensures construction safety for the existing tunnel and metro structure. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

山西海事：夯实基础 建立长效机制

山西地处华北西部的黄土高原东翼,属于典型的非水网地区,全省通航总里程1234公里,其中,黄河流经山西省4个市、19个县（市、区）,通航里程971公里,是与蒙、陕、豫的天然分界线,沿黄地区经济发展缓慢,自然条件恶劣,渡运是两岸百姓生活、农作、交流的主要运输工具之一,具有点多、线长、面广的特点,船员大多数属于当地村民,     

Human machine collaborative support scheduling system of intelligence information from multiple unmanned aerial vehicles based on eye tracker

Many human-machine collaborative support scheduling systems are used to aid human decision making by providing several optimal scheduling algorithms that do not take operator’s attention into consideration. However, the current systems should take advantage of the operator’s attention to obtain the optimal solution. In this paper, we innovatively propose a human-machine collaborative support scheduling system of intelligence information from multi-UAVs based on eye-tracker. Firstly, the target recognition algorithm is applied to the images from the multiple unmanned aerial vehicles (multi-UAVs) to recognize the targets in the images. Then, the support system utilizes the eye tracker to gain the eye-gaze points which are intended to obtain the focused targets in the images. Finally, the heuristic scheduling algorithms take both the attributes of targets and the operator’s attention into consideration to obtain the sequence of the images. As the processing time of the images collected by the multi-UAVs is uncertain, however the upper bounds and lower bounds of the processing time are known before. So the processing time of the images is modeled by the interval processing time. The objective of the scheduling problem is to minimize mean weighted completion time. This paper proposes some new polynomial time heuristic scheduling algorithms which firstly schedule the images including the focused targets. We conduct the scheduling experiments under six different distributions. The results indicate that the proposed algorithm is not sensitive to the different distributions of the processing time and has a negligible computational time. The absolute error of the best performing heuristic solution is only about 1%. Then, we incorporate the best performing heuristic algorithm into the human-machine collaborative support systems to verify the performance of the system.     

船闸智能排挡技术应用初探

利用计算机进行智能排挡是提高船闸运行效率的有效手段， 为了将船闸智能排挡技术有效应用于实际工程建设运营中， 文章分析了所需的关键技术， 包括调度技术、 排挡算法和计算机仿真技术， 并将其应用于 “浙闸通” 智慧过闸系统中， 有效提升了船闸运行效率。