空中交通进近排序及优化调度

针对空中交通进近管制地区日益繁忙的交通流量,设计了一种进近排序及优化调度方案。目前的空中交通调度依赖于管制员的经验判断。随着交通流量的增加,管制员的工作负荷越来越重,这就进一步威胁交通安全。管制员通常以牺牲容量为代价来保障安全,结果造成大量的交通延误。该文设计的进近管制排序和优化调度方案能够在充分保证安全运营的情况下最优地使用机场和空域的容量。同时为管制员提供方便直观的决策支持工具,可以进一步减轻管制员的工作负荷。该方案已应用于清华大学国家CIMS中心与华北空管局合作开发的空中交通管制指挥检测系统(ATCCMS)中,得到了管制员的一致好评。     

基于WinCC的明胶工业中和工序监控系统

介绍一种应用于明胶工业生产中和工序生产过程的动态计算机监控系统,该系统上位机采用西门子WinCC6.0,下位机采用西门子S7-300系列PLC,联合进行动态监视与控制。详细介绍了监控系统中上位机软件的设计与实现,完成了人机界面、状态监控、参数设定、数据归档、报警记录等功能,通过该系统的使用,生产出的明胶产品质量良好。     

监控环境下信号交叉口控制延误的获取方法

依据摄像头监控环境下可以检测到的相关参数,给出了信号控制交叉口进口道的车均控制延误参数提取的方法.文中以各个周期饱和度不超过1.2的信号控制交叉口进口道为研究对象,根据该周期的车辆通行需求和交通供给,将交叉口进口道的状态划分为正常交通状态和饱和交通状态;然后根据本周期车辆的到达情况、上周期排队车辆对本周期的影响及本周期排队车辆对下个周期的影响,结合监控环境下可以直接获取的相关参数,对两种交通状态分4种情况分析了交叉口进口道的控制延误参数的提取方法,构建了相应的模型.最后通过实例表明,该论文陈述的模型可以较好的提取交叉口进口道的控制延误参数.     

基于S7200的倒计时交通灯监控系统的设计与实现

以组态软件MCGS为开发平台,利用PLC设计一个交通控制系统。该系统通过上位机和下位机之间的数据传输,以良好的人机交互界面实现对十字路口交通信号的实时监控。用S7200的PLC将PLC的逻辑控制、数据运算、数据传送、数据转换的功能通过程序有机地结合起来,构建完成了既能控制交通灯的变化,也能将灯变化的时间用数码管显示出来的交通信号灯控制系统。给出了系统的硬件接线和PLC软件流程图;并利用组态软件MCGS对该系统进行实时监控,经试验效果良好。     

基于动态图像分析的油田生产监控系统

针对油田和气井等野外作业,设计无人智能监控系统,采用USB摄像头采集图像,组建嵌入式视频监控系统,实现动态监控。运用动态图像分析和处理技术,获取动态图像报警和控制信号,并实现实时视频图像Internet网上传送。系统响应速度快,低于100ms;控制精度高,动态图像区域小于背景面积的1%;实现了图像检测火灾,构成多功能监控,可运用于火灾和环境远程监控;与温度传感器复合使用,实现了立体监控,极大地降低误报率。实验证明,系统方案简单,控制效果好,可移植性强,适用范围宽。     

交通管制员行为风险防范探讨

交通管制员的工作状态直接影响到交通管制中的风险。管制员则是空中交通管制员的简称,而在影响空中交通风险的因素中,管制员的行为因素则占了相当大的比重,而且这也是很难把握的一个重要因素。交通管制员虽然不是一个个体但是若出现行为方面的失误,则会给整个空中的管制活动产生重大影响,甚至出现不可挽救的危险。因此该文主要分析了交通管制员的行为中的风险因素,并提出了一定的防范措施。     

组态技术和PLC在人行道护栏控制系统中的应用

介绍了基于MCGS组态软件与欧姆龙公司CQM1H系列可编程序控制器的人行道护栏控制系统设计及控制系统的组态过程;给出了控制系统的硬件组成、软件设计,并制作出控制系统的动态监控画面;在MCGS和PLC串行通信的基础上,通过计算机控制PLC,实现了对十字路口交通灯及人行道护栏的控制.     

基于FPGA的高阶FIR滤波器设计

以对激光陀螺的滤波为应用背景,利用FPGA内部RAM、ROM和乘法器IP核为核心,经过可靠的同步时序设计和稳定的逻辑控制设计,在低成本的情况下很好地实现了一种高阶滤波器的设计;并且具有良好的可移植性。使用该滤波器,极大地降低了系统成本和复杂度,可以使设计人员轻松地完成对激光陀螺的高阶滤波,而不需要提高系统硬件成本。     

基于PLC的异步电动机监控系统的设计及应用

本文介绍基于可编程逻辑控制器(PLC)的异步电动机监控系统的设计及实现。同时,在获得异步电动机运行参数的前提下,实现电动机保护和速度控制的硬件和软件设计。     

基于L-M神经网络的空中交通复杂度评价方法研究

随着空中交通流量的不断增长,航班延误日趋严重,迫切需要在保持安全水平的前提下提高空中交通管理能力。针对这一问题,本文在给定的空域条件下,从交通流、飞行活动特征和冲突三方面提出空中交通复杂度的评价指标,并考虑了管制员工作负荷的因素。以进入扇区的流量、改变高度的航空器比例、航空器速度改变次数、航空器航向改变次数、航空器通过扇区的平均时间和冲突数量作为空中交通复杂度的参数,利用L-M神经网络算法建立空中交通复杂度评价方法的数学模型。通过一个具体的数值算例,对比了LM算法与传统BP神经网络算法的计算结果,实验结果表明所提方法具有较高的逼近精度,验证了所提出方法的有效性和可行性。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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