压水堆冷却剂系统协调控制方法研究

从大系统协调控制原理出发,总结已有研究成果,提出稳压器压力及主冷却剂泵转速的协调控制方法,即把负荷变化信号引入原来的控制系统,认为把协调控制方法应用到核动力装置各个系统的协调控制之中有很好的前景.     

GPS连续观测导出的洋山深水港码头平面位移变化特征

采用GPS技术对洋山深水港码头、承台进行平面位移连续监测,获取平面位移随潮汐波动的日变化特征和平面位移长期变化特征.阐述了平面位移监测方案的优化,介绍了数据处理与沉降规律分析的方法.     

An empirical analysis on the arterial fundamental diagram

For uninterrupted traffic flow, it is well-known that the fundamental diagram (FD) describes the relationship between traffic flow and density under steady state. For interrupted traffic flow on a signalized road, it has been recognized that the arterial fundamental diagram (AFD) is significantly affected by signal operations. But little research up to date has discussed in detail how signal operations impact the AFD. In this paper, based upon empirical observations from high-resolution event-based traffic signal data collected from a major arterial in the Twin Cities area, we study the impacts of g/C ratio, signal coordination, and turning movements on the cycle-based AFD, which describes the relationship between traffic flow and occupancy in a signal cycle. By microscopically investigating individual vehicle trajectories from event-based data, we demonstrate that not only g/C ratio constrains the capacity of a signalized approach, poor signal coordination and turning movements from upstream intersections also have significant impact on the capacity. We show that an arterial link may not be congested even with high occupancy values. Such high values could result from queue build-up during red light that occupies the detector, i.e. the Queue-Over-Detector (QOD) phenomenon discussed in this paper. More importantly, by removing the impact of QOD, a stable form of AFD is revealed, and one can use that to identify three different regimes including under-saturation, saturation, and over-saturation with queue spillovers. We believe the stable form of AFD is of great importance for traffic signal control because of its ability to identify traffic states on a signal link.     

城市轨道交通与常规公交衔接研究

明确轨道交通与常规公交衔接的必要性,从衔接布局、换乘能力及运营系统衔接方面进行分析,概要提出一体化衔接体系。研究证明,只有将轨道交通与常规交通合理衔接,才能实现城市公交系统的效益最大化。     

Dispatch coordination between high-speed and conventional rail systems

Cross-line trains,as a link between high-speed and conventional rail networks,will increase the complexity of transport organization and lead to significant challenges in dispatch coordination between the two systems.Based on the characteristics of high-speed transport organization,this paper deals with the necessity of dispatch coordination between high-speed and conventional lines from the following two perspectives:the operation of cross-line trains and work coordination in connection stations.An adjustm...     

浅谈江阴大桥大位移桥梁伸缩缝的施工工艺

近年来随着我国桥梁设计和施工水平的不断提高,一些跨径超千米的特大型桥梁的修建不断增多,同时对这些桥梁使用的大位移桥梁伸缩缝的设计和安装也有了很高的要求。以江阴长江大桥DS2000型转轴式桥梁伸缩缝的更换安装工程为例,全面系统地介绍了旧缝拆除、新缝安装的施工要点及施工工艺。     

建设生机勃勃的校园——关于构建和谐校园的思考

构建和谐校园是实现学校各种力量的平衡,是各种关系的协调,是推动学校持续、健康发展的需要。本文认为可以通过加强校园道德文化建设;完善学校各项规章制度;妥善协调校园中的各种关系;寻找学校主要矛盾与尖锐问题,积极解决问题,疏通障碍等方法和途径来构建和谐校园。     

机场道面基层顶面当量回弹模量的计算方法

应用弹性层状体系理论与弯沉等效原则,研究了道面结构参数、飞机荷载作用半径及主起落架构型对基层顶面当量回弹模量的影响.通过分析126种典型道面结构,建立了机场道面基层顶面当量回弹模量的回归公式,并根据弹性层状体系理论的当量回弹模量反算解验证了回归公式的准确性.分析结果表明:考虑飞机荷载作用半径和主起落架构型修正系数,荷载...     

桥梁动位移测试的数字处理方法研究

提出了采用MEMS加速度传感器进行动位移测试整体算法框架,即对测量的加速度信号进行板上软件滤波和积分处理进而得到桥梁的动位移.设计了各环节的算法并分析其性能,进行了实际测试的对比研究,成功地处理了天津汉沽蓟运桥现场试验数据.研究表明:采用该传感器进行桥梁动位移测试稳定性好,可靠性高.该研究时桥梁动态监测工作有重要的实用...     

污水厂污泥产率随季节变化研究

污泥产量可根据经验污泥产率和污水处理量测算,但由于进水水质变化,运行控制不同,同一污水厂的污泥产率会因季节更迭而有所不同.通过对杭州市四座典型污水处理厂的调研研究,先分析了污泥产率随季节变化的规律,然后从进水COD浓度、SS浓度以及运行水温三个角度深入探究了污泥产率的具体影响因素,结果表明:各污水厂春季污泥产率高于其他...