Model Test on Grouting Law in Dynamic Water-Rich Sand Layers by the Electric Resistance Method北大核心CSCD

In order to study the diffusion law of grouting slurry in the water-rich sand layer under flowing water conditions, a grouting test model consisting of a main test system, a grouting system, and a measurement system was developed. And for detecting the diffusion scope of the grouts, a new resistivity method was proposed. It is found that the relationship between grouting pressure and grouting rate during the test is strong. Under hydrodynamic conditions, the grouting slurry diffuses elliptically. Due to gravity and the effect of the upper water flow, the center of gravity of the ellipsoid is below the grouting outlet, and the grouting effectively improves the physical and mechanical properties of water-rich sand bodies. At the same time, the resistivity method has a good application effect on the detection of grouting diffusion range. The range of slurry diffusion obtained by the resistivity method is basically consistent with the boundary of the stone body after excavation, indicating that the resistivity method is reliable for detection of grouting range in dynamic water-rich sand layer. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

The effect of crowding on public transit user travel behavior in a large-scale public transportation system through modeling daily variations

In this paper, the crowding effect in a transit vehicle is modeled in a time-expanded network that considers the daily variation in passenger flows. The study models the daily variation of in-vehicle crowding in a real large-scale transit system. A transit assignment for this real network is modeled and implemented by constructing a crowding cost function that follows the valuation of crowding and by using the reliable shortest path finding method. The direct application of the crowding model to a real network for the Utah Transit Authority indicates that crowd modeling with multi-user classes could influence public transportation system planning and affect the revenues of transit agencies. Moreover, the addition of the disutility factor, crowding, does not always appear to cause an increase in disutility for transit users.     

基于蚁群算法和群决策理论的动态路径优化研究

文章针对城市交通信号控制中的动态路径优化问题,综合考虑相邻交叉口间距和路段交通饱和度两个参数的影响,提出了一种基于蚁群算法和群决策理论的动态路径优化算法模型,并通过仿真实验,对比分析了该算法模型的有效性。     

物联网平台下智能交通系统体系框架研究

文章以现有智能交通系统体系框架为基础,提出以结构化方法制定物联网平台下智能交通系统体系框架,并以结构化方法的基本步骤为主线,结合物联网工作原理和自主体系结构,从用户服务、逻辑框架、物理框架三方面探讨新体系框架与现有体系框架的差别。     

带超速保护功能的柴油机机旁气动操作系统设计

柴油机控制系统主要有气动控制系统、电-气混合控制系统、微机式控制系统、可编程控制器控制系统等,目前,我国大量船舶上使用的是气动控制系统或电-气混合控制系统,机旁气动操作系统是以上两种控制系统的重要组成部分。本文主要介绍了一种带超速保护功能的柴油机机旁气动操作系统,提高了柴油机旁气动操作系统的安全性。     

浅埋暗挖地铁隧道施工监测方法

文章以重庆市地铁一号线大坪车站临时施工便道为例,对在浅埋、软岩条件下既有隧道拆除采用工字钢支顶、风镐破岩,新建隧道采用台阶法环形开挖预留核心土、人工非爆破开挖的施工方法,通过现场监控量测,得出最大地表沉降仅为3.82mm,表明采用合理的施工方法可以减少地表沉降。     

基于改进LSTM-NN的安全性自动驾驶换道轨迹规划模型

为改善现有的自动驾驶换道轨迹规划模型产生的换道轨迹与真实的换道轨迹存在较大偏差的问题,提出了一种改进LSTM-NN的安全敏感性深度学习模型,该模型可以缓解当前自动驾驶轨迹规划存在的不足,输出轨迹既保证了较高的精度又提高了安全性。CarSim仿真软件模拟了本模型产生轨迹的可跟踪性,结果显示轨迹非常平滑,并且自动驾驶车辆可以高效、安全地完成换道。     

铁路客车轮对踏面硌伤自动分析系统的研究与实现

为了解决客车轮对踏面硌伤人工分析效率低且质量不高的问题,基于大数据关联分析技术,构建了一套硌伤自动分析系统.从硌伤排查、自动分析、故障定位、统计分析4个方面分析系统的主要组成和功能,探讨了实现系统的关键技术.系统的应用提高了对客车轮对踏面硌伤分析和故障排查的效率.     

《灯笼》中的越轨少女考察

文章说明了太宰治试图通过《灯笼》这部作品叙述自己苦于世人的歧视、后又释怀的心路历程，同时也表明了希望世人消除对弱者的歧视的愿望。     

The Symbolic Significance of The Scarlet Letter

As a great romantic novelist in America in 19th century,Hawthorne was outstanding in handling the application of symbolism.The Scarlet Letter is Hawthorne's most important symbolic novel,which stands as the best work of Hawthorne and one of the indubitable masterpieces of American literature.This thesis aims at the exploration of the usage of the symbolism in the novel.It mainly discusses the deep symbolic significance of the scarlet letter "A" and the little pearl.The scarlet letter is the central symbol of the novel.Its symbolic meaning changes from 'adultery' to 'able',even 'angelic' in the novel.It also examines the symbolic meanings of little Pearl and some typical natural surroundings such as the jail,the forest,the rosebush and so on.