考虑病害三维特征的沥青路面车辙异常检验方法

针对复杂路况下车辙深度异常或横断面数据不完整的问题,提出了基于病害三维特征的路面车辙异常检验方法.首先,对三维图像中激光点异常值进行筛选及修正,利用横断面深度数据应用包络线算法提取最大车辙.考虑到裂缝、坑槽和拥包对车辙提取存在误判,利用三维高程数据建立病害种子检测模型以自动提取裂缝、坑槽和拥包种子点.测试结果表明,车辙深度相对误差小于7%,车辙深度测量重复性小于4%,包络线算法结果与人工测量值的相关系数高达0.999 2.在车辙异常检验中,裂缝种子识别模型准确率和召回率的均值分别为92.18%和84.79%,且F值为88.33%,优于支持向量机及改进的Canny方法.坑槽及拥包种子识别模型检测正确率大于95%.所提方法不仅能高效地提取车辙深度,而且能准确地检验造成车辙检测异常的其他病害.     

X123线沥青路面面层推移拥包成因分析及防治

通过对X123线改造以来沥青路面面层所产生的推移拥包病害进行了认真的分析，从设计和施工两个方面细谈了如何在源头上防止推移拥包病害的发生，并根据该路线的特点和养护实践，谈了一些自己的施工体会。怎样彻底有效地处治X123线推移拥包病害，从而有效避免前补后坏的现象发生，达到降低养护成本的目的。     

基于对数映射的三维路面高程晕渲技术研究

采用传统的基于线性高程晕渲方法重建的三维路面,对于较平整的路段,显示的路面效果比较夸张,而对于路面质量较差的路段,在显示坑槽的同时,又会忽略路段的平整特性。提出一种基于对数映射的三维路面高程晕渲方法,首先以路面平均高度值为基准将测得的路面相对高程归一化,再将归一化后的高程进行对数映射,最后将变换后的数据线性等分成20个晕渲色层。在-10~+10mm的相对高程范围内对应于10个色层,表征路面的平整特性,-10~-100mm和+10~+100mm的相对高程对应于另外10个色层,用于表征路面的变形类病害。研究结果表明:运用这种方法不仅能够实现对路面质量较差、路面有较大坑槽和拥包的三维路面的彩色晕渲,同时还能表现路面的破损信息、局部平整度及车辙信息,增强了显示效果。     

基于三维激光扫描点云的道路路面变形分析方法

针对常规的道路路面变形分析方法存在工序复杂、效率低、局限性较大且难以对路面的整体变形做出全面变形分析等特点,提出一种基于三维激光扫描技术对道路变形分析的方法。采用三维激光扫描技术获取运营中道路路面的点云数据,并建立道路路面数字化模型定性且定量地对道路路面进行变形分析,进而得到路面的整体变形区域和变形量。结果表明,通过三维激光扫描技术可以更加直观、简洁地对道路做出数字化分析,对道路病害监测技术的自动化发展有着极为重要的意义。     

基于GPS和车辙的三维路面重构

提出了一种基于地理定位系统(GPS)和横断面车辙数据的路面三维重构模型.针对GPS和车辙的采样间隔不同,首先采用Cardinal插值算法对非等间距的离散GPS点插值,并按间距需求选取等间距的插值点,然后将序列化后的GPS插值数据与车辙数据融合,构造出在三维空间中用于绘制三角形网格的顶点矩阵,最后实现了三维重构路面的绘制.实验表明用该方法重构的三维路面在路面车辙、坑槽及拥包的检测方面有很好的应用价值.     

GTM法沥青砼在干线公路上的应用

针对干线公路交通量大,车载超重,易发生车辙、推移、拥包等病害的实际情况,采用GTM试验法配置沥青混凝土预防并在干线公路上进行应用.     

浅谈沥青路面的常见病害与处治

公路是国民经济发展的重要基础设施，如何制造良好的交通环境、确保公路的通行能力是非常重要的。然而，公路由于受自然因素的影响，加上汽车荷载的作用，以及随着公路使用时间的推移，在公路上会产生各种各样的病害，从而影响交通。下面就沥青路面的几种常见病害及处理谈谈自己的看法。沥青路面是我国三大路面（水泥混凝土、沥青、砂石）中较为普遍的一种，它具有投资小，路面弹性好，便于维修等特点，但也会常常出现各种病害，如：泛油、波浪、拥包、坑槽、裂缝、啃边等。拥包、波浪、泛油这三种病害多产生于夏季高温期，拥包，大多是由于…     

沥青路面常见病害的防止

近年来调查,部分道路发现沥青路面常见病害十分突出,许多问题涉及到高等级路面,出现局部路段路面裂缝、泛油、局部有拥包现象。本文对沥青路面常见病害产生的原因及如何防治进行了探讨     

巷道收敛监测三维动态可视化系统开发

结合传统巷道收敛仪与三维激光探测系统的优势,提出了一种巷道表面收敛变形的三维可视化方法,该方法利用激光扫描获取巷道点云数据,建立巷道三角形壳体模型.采用反距离加权插值算法,计算巷道表面的收敛量.利用收敛量与颜色索引对应的抛物线非线性增强算法,突出了关注范围内大的收敛变形.基于VS2010与HOOPS进行了系统的开发,实现了巷道表面监测收敛量三维云图的动态可视化显示.并在铁蛋山矿进行了实例应用,直观地展示了监测区域巷道收敛变形的危险区域与变形过程,系统满足工程人员对监测数据直观表达和可视化分析的需求.     

虚拟装配环境中的人机交互技术研究

为了解决虚拟装配系统中的人机交互问题,结合虚拟装配环境,给出了数据手套和三维跟踪器的驱动类,阐述了数据手套和三维跟踪器的原始数据获取方法和处理策略.提出了综合使用数据手套和三维跟踪器数据进行手势识别与命令映射的方法;采用非模态的动态透明菜单和对话框作为数据手套和跟踪器的补充方式进行人机交互;讨论了通过虚拟手操作零部件模型的虚拟装配过程.通过开发基于三通道投影的虚拟装配环境,对数据手套、三维跟踪器以及头盔显示器等应用进行了实例验证,验证结果表明上述方法有效可行.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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