基于Google Earth的网络化三维GIS的研究

本文基于Google Sketchup软件进行三维建模研究,将建立的三维模型发布到Google Earth上,并利用Google Earth API和KML进行二次开发研究.以网页形式发布三维模型,并提供浏览、定位查询等功能,此方法是一种快速开发三维网页的形式.本文对三维网页发布的技术实现过程进行探讨,力求三维GIS更加具有实用性.     

基于KML和虚拟地球的三维数字校园研究——以兰州大学为例

提出了一种新的三维数字校园建设的技术路线.在介绍相关技术背景的基础上,详细阐述此技术路线包含的两个关键部分,即基于KML的三维模型优化策略和基于虚拟地球应用程序接口的三维数字校园系统架构.最后将兰州大学三维数字校园系统作为实验案例,实现了在线访问、三维浏览、查询定位等功能,并且具有三维环境漫游流畅和系统开发便捷的特点.通过本系统取得的良好效果,证明了本文提出的基于KML和虚拟地球的三维数字校园建设技术路线切实可行,并在三维建筑物模型优化和轻量级的系统架构方面有很大优势.     

数字校园三维仿真系统设计与应用

以福建师范大学旗山校区为实例,建立基于IMAGIS平台的数字校园三维仿真系统,以仿真的模型再现校区空间结构,实现数字校园的空间信息三维可视化和空间地理信息分析查询,为校园管理和服务提供一个科学简便、形象直观的可视化人机交互平台.通过数字校园系统,利用宽带流和金字塔技术在WEB与Google Earth上实现校园交互漫游查询,建立校园谷歌,增强数字校园信息现代化管理以提高学校的知名度和影响力.     

数字校园三维景观建模方法的分析与应用

分析了数字校园三维景观建模的常用方法,选用SketchUp软件,以某大学校园为例,建立了部分校园景观的三维模型.并对建模过程中的问题进行了探讨.     

虚拟漫游系统关键技术研究

以渤海大学为实例,建立了基于VRML的虚拟校园漫游系统,以仿真的模型再现校园的空间结构,实现了数字校园的空间信息三维可视化,为校园管理和服务提供了一个科学快捷,形象直观的可视化人机交互平台.重点研究了三维建模的关键技术以及场景的优化策略,最后利用支持VRML的3D Max软件实现了三维复杂物体的建模,通过VRML中的传...     

基于Vega的虚拟仿真校园的研究与应用

介绍了在Vega平台中开发虚拟仿真校园过程的关键技术和解决方法.现以兰州交通大学作为研究对象,建立基于Vega平台数字校园三维仿真漫游系统.该系统以逼真的三维模型再现校园空间和提供空间地理信息查询,从而提高学校的管理水平和知名度.     

虚拟校园建立方案设计与实现

将虚拟现实技术用于GIS中建立的虚拟校园能够更形象、直观、交互地展现三维校园场景,用户能更有效地获取感兴趣的信息.文章以山西大同大学煤炭工程学院校区为例,探讨了基于虚拟现实和GIS技术建立虚拟校园的方法.用SketchUp软件辅助建模,用ARCGIS软件组织数据和场景,建立了虚拟校园,实现了浏览和查询.     

基于ARCGIS与3DMAX的三维虚拟校园模拟——以咸阳师范学院为例

目的以咸阳师范学院为例,建立数字校园系统并实现虚拟展示与数据查询的功能。方法以Arcscene为平台,借助3DMAX2010软件精细建模并生成3ds文件,以点要素方式将三维建筑与GIS平台融合。结果通过校园虚拟景观的模拟(三维建模)、虚拟场景与展示平台的融合(模型的导入)以及属性信息的采集和添加等一系列步骤建立三维虚拟校园系统。结论三维虚拟校园系统不仅可以展示校园景观三维动态、并实现校园建筑属性信息查询与管理。     

安徽师范大学三维虚拟校园系统建设研究

随着虚拟现实和三维地理信息系统技术的日趋成熟,三维虚拟校园建设已成为数字校园建设的新热点.本文结合安徽师范大学三维虚拟校园建设的实际需求,分析了三维虚拟校园建设的主要内容和系统实现的总体框架,探讨了数据源的获取和处理、建模软件的选取和应用、三维模型的建立和优化等校园三维建模的技术细节,并研究了模型的快速加载与实时漫游、二三维动态交互、基于插件技术的集成应用框架等系统实现的关键技术.根据本文提出的建设方案和技术方法,采用3DMAX建模软件制作了安徽师范大学三维校园模型,并在VisualStudio 2008平台下,基于OpenGL和.NET类库,采用插件式技术编程实现了安徽师范大学三维虚拟校园原型系统,系统在运行效率、独立性、真实感和可扩展性等方面取得了较好的效果.     

基于三维GIS的校园浏览系统的研究

多数校园地图是二维地图,但三维浏览系统比二维地图更具有表达性、认知性、具有更形象的现实逼真效果。基于组件式GIS的开发方式,结合ArcEngine提供的相关接口,阐述三维建模技术开发虚拟校园系统的基本思路。同时采用3DSMAX建模技术和VS.NET开发平台,建立盐城师范学院新长校区三维场景浏览系统,拟实现场景浏览、信息查询、统计分析和三维基本控制等功能。     

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