冰雪条件下信号交叉口上游拥堵识别方法

为解决冰雪条件下的信号交叉口上游拥堵识别问题,提出基于研究临界消散车队长度值的拥堵识别方法. 该方法根据汽车行驶理论与拥堵区间车辆行驶特点,将拥堵临界车辆的行车过程分为加速、匀速和减速过程,通过分析的拥堵排队车辆通过交叉口的过程,建立不同冰雪路面信号交叉口拥堵识别模型. 通过不同条件下相关参数标定,计算上游路段拥堵临界位置. 利用哈尔滨市区一个交叉口的实际调查数据进行验证,证明该模型能很好与实际相契合.     

城市道路交通平面交叉路口拥堵预测

针对交叉口路段拥堵特性,基于定性推理的相关方法,从时间的角度,提出了描述城市交叉口进口路段运行状况的评价指标——稳态评判指数。仿真实验表明,当交叉口交通拥堵与消散的过程被触发时,稳态评判指数会发生定性跃迁,并且每个高峰期的到来都会经历一个“稳态——非稳态——稳态”的过程;并且由该指数确定的拥堵临界点时刻与由交叉口总排队长度所反映的交叉口拥堵形成与消散时刻基本吻合,为交叉口的运行状况评价及拥堵预警提供一个指标。     

交叉口及路段拥挤界定研究

当前,我国城市交通供需矛盾日益突出,城市道路及交叉节点的拥堵界定及拥堵评价具有重要意义。通过对交叉口及路段拥堵概念的提出,分析了国内外相关研究的成果,提出适合我国城市交通运行特征的交叉口及路段拥堵界定方法。对交叉口及路段服务水平的评价方法进行了归纳总结,通过实例研究了典型交叉口的延误仿真评价,并对交叉口与路段拥堵的相互作用机理进行了初步分析。研究成果对我国城市交通运行的评价和改善具有理论意义和实践意义。     

基于BIM对合肥徽州大道与水阳江路交叉口优化与交通评价研究

针对现状城市道路交叉口存在的交通拥堵问题,通过信息地图提供的城市实时交叉口路况拥堵数据,选取典型交叉口进行现场交通流量调查分析,提出合理不同的解决方案,利用BIM三维仿真技术进行实时建模.通过优化交叉口模型对交叉口拥堵情况比较分析,进行交通评价,得出解决交叉口拥堵最优方案,达到提升交叉口通行效率.     

城市道路交叉口改善设计

以石家庄市裕华路和谈固大街交叉口为案例，进行城市道路交叉口改善设计。首先对交叉口的位置、地形、交通量等原始设计资料进行收集，然后通过Synchro仿真软件评价交叉口交通流运行状况，并依据有关设计规范，在扰动最小的原则下进行了横断面和交叉口拓宽设计。改善设计后，总延误时间由原来的6.1 h缩短为2.7 h，对交叉口的拥堵起到了一定的缓解作用。     

基于环形线圈的道路交叉口车辆拥堵饱和自动清空研究

道路交叉口交通高峰期经常出现某一方向车辆拥堵饱和导致整个交叉口交通瘫痪,存在型环形线圈车辆检测器对道路交叉口中央车辆的存在进行检测,通过型环形线圈车辆检测器对拥堵交通流下游车辆通过率进行检测,将两种检测器的检测结果结合,改变道路交通信号灯指示,对车辆拥堵饱和交叉口的车辆自动清空,根据车辆拥堵时间长短,调整原来交通流放行,并将通行权重新分配。自动清空路口是一种解决交叉口车辆拥堵的有效方法,可以提高交通高峰期道路交叉口的通行效率。     

城市道路交叉路口的拥堵预测

针对交叉口路段的拥堵特性,基于定性推理的相关方法,从时间的角度,提出了描述城市交叉口进口路段状况的评价指标——稳态评判指数.仿真实验表明,当交叉口交通拥堵与消散的过程被触发时,稳态评判指数会发生定性跃迁,并且每个高峰期的到来都会经历一个"稳态——非稳态——稳态"的过程;由该指标确定的拥堵临界点与由交叉口总排队长度所反映的交叉口拥堵形成及消散时刻基本吻合.     

一种基于路况数据的城市道路交叉口拥堵评价指数研究

提出了交叉口总延误时间指数和单一方向最大延误时间指数,利用从导航软件获取的交叉口各进口方向路况、排队长度和车道数等数据,建立了交叉口拥堵评价指数模型。利用北京交叉口实例对模型的适用性进行了验证,在此基础上依据交叉口总延误时间指数和单一方向最大延误时间指数对案例交叉口进行了拥堵水平排序,排序结果与实际情况相符。交叉口延误时间指数相较于传统的交叉口评价指标,充分利用导航软件的大数据,避免了繁琐的现场调研工作,具有很强的规模化操作性和实用性,为城市管理者在交叉口改造决策方面提供了更加可靠的理论依据。     

一种基于路况数据的城市道路交叉口拥堵评价指数研究

提出了交叉口总延误时间指数和单一方向最大延误时间指数,利用从导航软件获取的交叉口各进口方向路况、排队长度和车道数等数据,建立了交叉口拥堵评价指数模型。利用北京交叉口实例对模型的适用性进行了验证,在此基础上依据交叉口总延误时间指数和单一方向最大延误时间指数对案例交叉口进行了拥堵水平排序,排序结果与实际情况相符。交叉口延误时间指数相较于传统的交叉口评价指标,充分利用导航软件的大数据,避免了繁琐的现场调研工作,具有很强的规模化操作性和实用性,为城市管理者在交叉口改造决策方面提供了更加可靠的理论依据。     

基于时空检测的城市交通网络瓶颈识别方法研究

为了解决拥堵状态下交通网络瓶颈识别问题,文章基于时空检测数据对道路节点和路段拥堵状态进行了分析,并以此为基础建立了城市交通网络瓶颈识别与分类模型。拥堵发生期间,以任意2辆浮动车连续通过拥堵路径各个交叉口时间间隔作为统计时间,以拥堵路径各个交叉口对应流向流出率作为统计对象,连续统计多辆浮动车通过时的交通量序列,建立了拥堵路径交叉口关联度模型并以此划分交通网络瓶颈。以划分的交通拥堵瓶颈区域作为密闭区域,通过分析拥堵路径平峰期间与拥堵期间的流入流出率,使用切比雪夫不等式在置信度95%范围内建立了拥堵瓶颈的3类模型:输入型瓶颈、输出型瓶颈和通过型瓶颈。以实际区域道路网络为研究对象,使用上述模型对拥堵区域进行了分析,结果表明该模型可有效识别并分类交通网络瓶颈。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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