关于廊坊市交通拥堵问题的数学模型的探究

本文通过调查廊坊市爱民道与新华路交口的车道设施、车流量及红绿灯的设置等情况,将各方面数据进行量化,分析造成道路交通拥堵的原因,针对现行方案的不足之处进行建模优化,即黄灯闪烁时间设置、红绿灯时间改进、信号灯设置调整、待行区域设置等方面的数学研究,得到更可行的交通缓解方案。     

用微分方程方法研究红绿灯控制下的交通流模型

红绿灯模型是交通流动力学模型研究中一个重要而困难的问题,首先给出交通流模型,然后给出红绿灯交通流模型与特征线的求解,根据红绿灯模型与特征线意义,对交通流的红绿灯转换周期的设置具有重要意义．     

基于“单排等待双排通过”的非对称交通流优化

目前,针对非对称交通流问题的解决方案主要是从时间和空间资源的利用方向进行思考的,在时间资源利用方面已经有很多成熟的方案,例如叠加相位、伴随相位等方案,然而在空间资源利用方面解决这一问题的方案较为局限,常用的有增加车道、设置交叉口待等区等方案。该文从西安实行的单排等待双排通过方案得到启发,对其进行优化,形成适合非对称交通流交叉口的方案。     

基于ResNet网络的红绿灯智能检测算法研究

提出了一种基于深度学习的红绿灯目标检测算法.在Yolo V3模型中引入残差模块学习方法,提出以ResNet残差网络模块作为特征提取网络,优化网络结构深度,对图像模型裁剪、训练参数等方面进行调整,利用PaddlePaddle深度学习平台AI Studio对红绿灯目标检测模型进行训练,得到了红绿灯的准确检测结果,红灯测试精...     

关于红绿灯长短的研究

红绿灯是现代化社会中必不可少的交通指挥工具。本文通过微元法,通过合理的假设,对此红绿灯对车流量的影响做了初步的研究,得出了红灯绿灯时间的长短对车流量影响的函数关系。通过合理的选择一个能使两个路口都能进行初始化的时间,即可得出较为合理的红绿灯时间。     

对湖北省体育术科统考改革的分析

文章运用文献资料法、访谈法、对比分析法、数理统计法等方法对湖北省体育术科统考改革进行分析。结果认为，1977年至今，湖北省体育术科统考在考试内容、评分标准、考试时间、考点设置等方面进行了改革，考试内容趋于合理，但在评分标准、考试时间、考点设置、考试规则等方面还不够完善，难以体现科学、合理、公平竞争原则。最后对湖北省体育术科统考进一步深化改革提出几点建议。     

交通信号灯的智能控制系统模型

在城市道路的“十”字路口中,红绿灯转换时间的固定机制致使道路资源的利用率低下,出行人员的不便利,交通安全方面的隐患等等一系列问题,为此笔者提出了引用双向蒙特卡罗法来计算车辆前照灯获取光源能量作为依据,来自动调整红绿灯的转换时间,实现道路的智能化管理。     

中国：智能红绿灯

一种能根据每个车道车辆多少确定红绿灯时间长短的智能交通信号控制设备——“交通信号识别控制仪”系统（智能红绿灯），由宝鸡市公安局、陕西省公安科研所和西安交通大学共同研制成功。     

十字路口红绿灯的控制效应

建立开放边界条件下的十字交叉路口元胞自动机交通流模型,通过研究十字交叉路口红绿灯对交通流的影响,确定各种交通状况下的最佳红绿灯配时方案.     

华北区体育教育训练学专业硕士研究生培养方案研究

对华北地区8所体育院系体育教育训练学硕士研究生培养方案进行研究，就培养目标、学习年限、课程设置等方面的问题进行了分析．     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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     

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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