基于VRML的三维CAI课件的制作

现有的CAI课件普遍存在没有真实感、交互性差等缺点.使用虚拟现实建模语言VRML创建CAI课件所需三维教学场景,并在此基础上实现对三维教学场景的交互控制,从而解决了现有CAI课件中教学认知和教学互动等方面的问题.     

应用虚拟现实技术的新型轮机模拟器总体设计与系统结构

提出应用虚拟现实技术的轮机模拟器总体设计与系统结构和虚拟机舱、虚拟集控室、虚拟驾驶台、虚拟控制仪表板的新概念,并予以实现.综合应用计算机生成的动态三维图形、多媒体和虚拟现实技术,可获得比物理模拟更真实的仿真效果,使轮机模拟器成为具有动态视景和良好人机自然交互界面、有临场感的操纵仿真器.     

山西师大主校区三维虚拟校园的建设研究

将虚拟现实技术应用于校园建设中具有重要意义.本文通过虚拟地表生成、三维景观建模、三维模型导入、虚拟现实场景再现等一系列步骤,利用ArcGIS 9.2初步建成山西师大主校区三维虚拟校园,并对有关技术进行了讨论.     

光伏微电网虚拟现实系统的设计与实现

为了辅助微电网的建设,借助于虚拟现实技术,设计并实现了微电网虚拟现实系统,其中包括微电网系统中重要组件(如光伏板、逆变器、储能装置等)的设计.首先用3DSMax建模,生成光伏微电网三维场景,然后再导入Quest3D,从而实现光伏微电网虚拟现实系统的漫游.系统对微电网系统的设计和建设具有很好的指导意义.     

虚拟现实开发平台系统的研究及实现

应用虚拟现实技术研究基于openGL的虚拟现实开发平台设计．在Rational Rose开发环境中用UML进行系统分析建模，并应用面向对象的技术，采用VC 6．0和open GL结合编程来实现平台开发．平台上提供可视化的基本图元，利用基本图元的封装性、可重用性，在平台界面上拖拽基本图形元素，生成三维图形和三维场景．并可用鼠标、键盘、六维鼠标这些外部设备平移、旋转、缩放基本图形或整体图形，通过设置图形的纹理贴图、光照、材质等来调配三维图形和三维场景，以达到最好的显示效果．     

一种采用智能方法的新型VR人机交互界面

在人机交互的发展历程中,随着虚拟现实技术和智能体技术的出现,开始出现了在生命系统指引下的一种新的基于智能体的虚拟现实(VR)人机交互界面.文章论述了基于多智能体的VR人机交互界面的系统构成及技术特点,给出了一种基于多智能体的实时监控人机界面的体系结构,详细描述了各部分的功能,并设计了1个基于多智能体的工业现场三维监测界面.     

走不进生活的VR

<正>虚拟现实实际是综合利用计算机图形系统和各种现实及控制等接口设备,在计算机上生成的、可交互的三维环境中提供沉浸感觉的技术,类似于3D技术,看过3D电影的人应该比较有感触。近几年来,提到VR相信大家都不陌生,VR被应用于很多场景中、另外,VR厂家还研发了各种VR设     

全景虚拟现实在网络课件中的应用

利用全景序列图像代替全景图像,避开了全景图像拼接和热点跳变这一技术难题.在普通微机和Win dows运行环境下构造三维虚拟场景,使用普通鼠标、键盘进行交互.将虚拟现实技术和网络技术有机地融入到网络课件的写作系统中,开发了一个集成型网络课件的写作系统.有利于非专业人员的使用和虚拟现实技术的普及.     

虚拟现实技术在非恒定流实时仿真中的应用(英文)

为实时显示河道流场的动态变化过程,将虚拟现实技术应用于非恒定流的实时仿真模拟,开发了基于虚拟现实技术的流场动态可视化系统.采用虚拟现实技术在计算机中构建真实的三维地形地物,进行交互漫游;河道流场状态由二维水动力学模型提供;基于粒子系统思想,采用运动的矢量箭头模拟动态流场,并将该流场集成于三维场景中,实现了虚拟现实与科学可视化的有机结合.为解决三维虚拟仿真与数值计算数据量和计算量都很庞大的问题,采用基于网络的并行算法,使数值计算与三维显示在不同的PC上进行,计算结果通过网络传输进行交互,同时采用插值处理的方法解决计算速度与显示频率不协调的问题.系统用来模拟三峡工程与葛洲坝工程当前流量状态下整个流场的动态变化,具备直观性、实时性和科学性,是流场实时模拟显示的解决方案之一.     

一种基于XNA的无限大地形生成方法

三维真实感地形是虚拟场景中的基础部分,其绘制的速度与质量是构建三维虚拟场景成败的关键。利用VS 2008和c#语言,以XNA为工具,用中点偏移算法生成的值与高程数据之间建立相应的映射关系,建立标准的地形高程数据组快速生成了三维网格地形。在渲染便的应用到虚拟现实系统中。     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to