基于ASP技术的网络地理信息系统研究

网络地理信息系统是地理信息系统和网络技术相结合的产物,它借助网络方便快捷的手段和地理信息系统自身特有的分析功能使人们能够更加有效地管理和利用因特网上的信息.在综合分析了ASP的特点及其开发WebGIS系统的基本方法基础上,构建了基于ASP技术的WebGIS系统结构,并结合实践给出了相关方面的具体应用.     

基于MVC模式的WebGIS架构设计

网络地理信息系统(WebGIS)是结合了地理信息系统与网络技术的一种新兴技术.WebGIS的架构设计是 其工业化应用的重要研究内容.从软件设计模式角度出发,介绍了WebGIS与相应的软件设计方法,提出了基于 MVC(模型视图控制器)模式的WebGIS架构设计.实际应用证明该架构是一种高效的设计方案.     

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.     

地理信息技术及其应用

地理信息技术是以遥感、地理信息系统、全球定位系统和网络等技术为其核心的综合性应用技术 ,它正逐渐成为当今信息技术的重要部分 ,并将成为信息领域各国竞争的制高点 .介绍了全球定位系统、遥感技术和地理信息系统等技术的现状和发展趋势 ,以及其在自然灾害监测管理、资源调查和监测、精细农业等方面的综合应用情况 .     

基于WebGL技术的网络三维地理信息系统平台

伴随着网络三维技术的快速发展,网络三维GIS也随之崛起,并在地理学中扮演着越来越重要的角色。由于网络数据传输受到带宽等因素的影响,因此如何满足地理信息系统大数据传输与处理的需要是网络三维地理信息系统所迫切需要解决的一个问题。Web GL技术的出现则是为这一问题提供了一个解决的方法。因此,该文就以一种无插件版的Web三维技术—Web GL为基础,介绍一个自主研发的网络三维地理信息系统平台,并介绍了该系统的系统主要框架,简述了其主要的功能。     

分布式组件在地理信息系统中的应用

近年来,随着因特网技术和通讯技术的快速发展,地理信息系统在各行各业的应用也得到迅速发展.本文探讨了使用EJB组件模型进行网络地理信息系统数据集成的原理,提出了一种在Web环境下,对于日益复杂的分布式地理数据,相应采取分布式组件的处理方法.     

地理信息系统与信息技术的融合

针对地理信息系统(GIS)与信息技术融合问题,从地理信息系统与信息技术逐步融合的过程方面,阐述了地理信息系统的发展和变化不仅基于一系列基本的GIS特性,而且还依赖于、受制于信息技术(IT);说明了GIS的发展历程是一个与主流信息技术逐步融合的过程,基本反映了信息技术的总体发展过程.GIS与数据(仓)库技术、网络技术、虚拟现实技术、人工智能技术和通信技术等的进一步融合是当前GIS发展的趋势.     

地理信息系统(GIS)的发展现状

地理信息系统是以采集、存储、管理、分析、显示和应用整个或部分地球表面与空间和地理分布有关的数据的计算机系统.随着计算机技术和网络技术的发展,出现了WebGIS,移动GIS以及虚拟现实地理信息系统VRGIS,本研究对GIS的发展现状进行了介绍.     

基于web的地理信息系统构建研究

这几年地理信息系统技术在不断的发展,它是一类空间信息分析技术。它对各种有空间属性的信息资源可以有效地进行管理,快速的分析检测各种管理和实践模式,以便于制定并确定科学的标准评价;还可以对不同时期的信息状况及生产活动变化不断的进行有效地监测和分析比较,给人们的工作和经济带来很大的方便。在社会不断的发展下,基于web的地理信息系统技术已经广泛的用与生活的各个方面。本文首先从地理信息系统与网络地理信息系统的概念和不同处着手,然后分析了网络地理信息系统的功能和应用,最后强调网络地理信息系统的不足之处与发展前景。     

基于网络的GIS辅助地理教学研究

随着计算机和网络技术以及地理信息系统的快速发展,为基于网络的教学提供了更为便利的条件。本文提出了一个基于网络的地理信息系统辅助地理教学的互动软件的设计。旨在：通过师生互动的软件平台,提高学生学习地理的兴趣;提高学生分析问题、解决问题的能力;提高教学的质量。     

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