基于 SVG 技术构建 WebGIS 研究

可伸缩向量图形(Scable Vector Graphics,SVG) 是基于XML技术的开放的矢量图形标准.本文从可伸缩向量图形(SVG)本身的技术特点出发,以构建网络地理信息系统(Web GIS)为目的,重点探讨了其丰富的图形对象、特定标志以及功能强大的消息触发和事件处理机制;并且就利用SVG技术实现网络地理信息系统(Web GIS)的功能进行了深入的研究和实现.     

基于XML技术的Web GIS架构分析与实现

在Internet环境下,XML技术更适合矢量空间数据的显示和发布及Web交互式操作。随着XML技术的发展,利用GML、SVG和XSLT等XML技术构建新一代的Web GIS平台成为可能。通过分析基于XML技术的Web GIS平台的特点,选择了以XSLT作为表示层的StrutsCX框架,并在此基础上建立了基于XML技术的Web GIS平台的体系结构,给出了其关键技术的实现。     

基于SVG技术研究电网调度自动化系统中的应用

图形在电网能实现自动性控制的过程中扮演着重要的角色,并且是电网在不同的系统中进行交互操作的基本前提。该文在介绍IEC 61970标准对图形交互要求的基础上,探讨了电网调度自动化系统中基于可缩放矢量图形（SVG）/公共信息模型（CIM）的图形互操作性,即将SVG与CIM相结合,实现能量管理系统EMS图形文件与SVG文件的动态转换,既提高基于Web的图形发布水平,又便于不同EMS间图形的导出/导入,展示了SVG技术在电力系统图形交互方面的优势,并在实践中获得应用。     

改进规则的可放缩矢量图形地图的查询模型

分析了基于SVG(可放缩矢量图形)格式时态GIS(地理信息系统)领域,尤其是地理元素查询方面的研究现状,针对现有的XML(可扩展标记语言)查询方法进行了分析和对比.在基于SVG语法规则改进研究的基础上,并结合LISAⅡ(layered intersection scan algorithmⅡ,分层交叉扫描算法Ⅱ)查询技术,提出了一种适合改进规则的SVG格式的GIS数据地理元素查询模型及其算法,通过定义关键字查询语法规则表达式,定义关键字查询的""和"or"操作规则,实现了组合查询;通过定义实体元素节点,减少了节点数,提高了查询效率.该模型实现了SVG格式地图的地理元素查询,包括对整幅地图的各种组合查询和分图层的各种组合查询,解决了基于SVG格式地图元素查询的技术瓶颈.大量的数据验证表明,该查询模型是有效的.     

基于SVG的WebGIS体系结构的研究

针对目前WebGIS面临着Web语言不支持矢量图形、传输种类繁多的海量空间数据受网络带宽以及其他路由限制等一些技术难题,分析了SVG技术特点及其优势,将SVG技术引入到WebGIS,提出了一个建立基于SVG的WebGIS系统的体系结构,并阐述了其实现的相关技术等。     

基于SVG技术的电力监控管理系统的研究与实现

SVG是Internet中基于XML面向网络应用、采用文本描述的二维矢量图形图像标准格式.本文总结SVG的特点,设计了SVG应用软件体系结构,在此基础上提出一种基于SVG技术的电力监控管理系统的解决方案,实现WEB用户对电力系统设备的图形化远程访问和控制,该系统可以推广到许多应用领域.     

JavaScript在基于SVG的网络地图中的应用

SVG是近几年发展起来的一种基于XML的二维矢量图形格式，已经在网络地图领域得到了广泛的应用．该文在地图数据的SVG编码的基础上，简要介绍了SVG的DOM接口以及JavaScript语言在基于SVG的网络地图中的应用。     

基于SVG的矢量图在测井行业的应用

SVG是基于XML语言、面向网络应用、采用文本描述的二维矢量图形图像标准格式。本文介绍了SVG的特点并在此基础上提出一种基于SVG技术的测井成果图像实现方案。测试证实,该技术优于传统技术,扩展了SVG的应用领域,同时也为测井数据提供了一个先进的图形化解决方案。     

应用SVG实现基于Web的UML图形编辑

在XML技术的基础上,应用SVG技术实现了一种基于Web的UML图形编辑方法．该方法是以XML数据文件表示UML图,然后通过XSLT变换程序把XML数据文件在服务器端变换为SVG代码,SVG代码在浏览器中显示．对图形的编辑操作包括放大、缩小和移动等,该方法的最大优势在于允许用户随时随地通过Web进行编辑．     

利用SVG开发高质量Web图像应用

SVG是W3C的一种图形矢量标准,利用SVG和JavaScript技术通过对DOM树状文档结点对象的访问和操纵,能够实现在网上快速加载强大复杂的矢量图,从而在Web中实现高质量的图像应用。     

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