AR测量实习系统的设计与实现

针对信息化背景下高校测量实习课程的数字化资料组织问题,采用Unity3D、Vuforia和Andriod结合的开发环境,从方案设计、开发流程、模块描述与功能实现等方面入手,设计并实现基于增强现实(AR)技术的测量实习原型系统.系统利用3DMAX软件对测量实习课程中的虚拟资源进行三维建模、动画制作,采用Unity3D引擎进行学习资源整合、虚拟场景搭建和交互操作,结合Vuforia SDK检测并识别目标特征,实现虚拟资源与现实环境的叠加显示.实验证明,系统稳定,识别速度快,能够在移动终端通过扫描识别图完成各种学习资料的展示和互动.     

两种基于标识的增强现实注册方法的比较

介绍了两种基于标识的增强现实开发包ARToolKit和ARTag.从标识定位错误发生率、标识混淆错误发生率和系统运行速度等方面,通过试验对两个系统的表现进行了比较,并从算法和原理上阐述了表现差异的原因,给出了试验结果.对基于标识的增强现实系统应用进行了展望.     

基于AR的互动式3D电子书的研发与实现

增强现实(Augmented Reality,AR)电子书是在传统纸质书籍的基础上,将计算机处理过的虚拟信息叠加在真实场景上,并借助感知和显示设备,将虚实信息融为一体,在显示静态模型的同时播放声音,从而显示虚拟三维景象的电子图书。本文阐述了使用ARTool Kit开发包和Open GL进行3D电子书的开发过程,在完成基本功能的同时改变模型加载方式,扩展了标识图的单一识别功能,展现了一个多样化的增强现实的发展和应用。系统使用不同的建模软件建立模型,并进行渲染加载,完成声音展示,使其更加生动贴近现实,提高了阅读者的阅读兴趣。该互动式3D电子书弥补了传统图书的不足,体现了增强现实电子书的独特优势,是增强现实在教育领域的一种有益应用,具有极大的市场价值和科研价值。     

基于快速响应码的移动增强现实系统的研究

快速响应码QR(Quick Response Code)是一种信息隐藏量大且使用广泛的编码,通过使用QR码代替传统的增强现实标识,并使用基于灭点的空间校正算法实现对QR码的倾斜校正,提出了一种改进的基于QR码的移动增强现实系统.在此基础上使用ARTool Kit和ZXing开发了原型系统,验证了基于QR码的移动增强现实系统的广泛前景.     

三维激光扫描与增强现实技术在 虚拟场馆建设的应用

文章研究基于三维激光与AR增强现实技术的智慧旅游微缩模型场景建设.以矿山公园虚拟场馆旅游为实例,使用高精度三维激光仪器,对矿区典型景区进行三维建模,打印出精确的3D微缩景观模型,并在3D模型的基础上开发出增强现实导览系统.游客使用手机扫描模型标签时,自动激活增强现实解说系统,大大增强游览的体验性、交互性和趣味性.该技术在景区模拟讲解、博物馆游览、旅游会展、旅游景区营销、休闲房产营销、高尔夫会所营销、旅游规划等方面也有着巨大的应用潜力.     

基于物体6D姿态估计算法的增强现实博物馆展示系统

针对文化遗产资源缺少生动逼真、沉浸感的展示的问题,基于增强现实技术,融合人工智能,提出了一种基于物体6D姿态估计算法的增强现实博物馆展示系统,用于文化遗产三维可视化展示。物体的6D姿态估计是指检测图像中出现的物体,并且估计其相对观察者的3D位置和方向。在增强现实领域中,6D姿态估计用于测量真实环境中物体的姿态,并将虚拟物体以正确的姿态添加到它们上面。针对增强现实系统中场景和对象融合精度低、速度慢的问题,研究了一种端到端的物体6D姿态估计网络,实现从RGB图像中进行物体目标检测以及姿态估计,提出的方法使用并联网络结构提取高分辨率特征,可以保留更多的空间信息,提升预测物体关键点的精度,使用一个姿态推理网络方式替代传统的数学计算方法,从关键点中得到物体的姿态,实现端到端姿态估计,提升检测速度。在该方法的基础上,研究了结合云计算、5G通信等多项技术的增强现实分布式框架,实现移动端的增强现实应用。实验结果表明,文中提出的物体6D姿态估计方法的准确率达到92.6%,运行速度达到30帧/s,满足增强现实应用的需求,可用于增强现实博物馆展示系统,为其提供生动的互动内容,突破文化遗产实物的时空局限性,为观众带来身临其境的参观体验。     

基于移动端平台古生物博物馆增强现实系统的设计与应用

数字化、智能化博物馆对于创新展览模式、提高参观体验、加深文化渗入有着重要意义。针对传统博物馆中呈现内容和交互形式过于单一的问题,同时为探究增强现实博物馆的建设,设计了一个基于Android移动端的增强现实系统,实现了现实环境与虚拟场景的无缝对接。首先从理论角度研究分析了增强现实技术的三维注册、虚实结合和实时交互3个要点,随后结合馆藏展品特点和人机交互的需求,通过Unity3D开发工具以Vuforia SDK为辅助进行系统设计,在构建系统框架的基础上实现了3D场景显示和内容交互,经实验测试,对系统进行相应的改进,然后以辽宁古生物博物馆为应用对象形成了面向参观与推广的安卓端移动增强现实系统,在实际应用中形式多样、效果逼真、交互感强,取得了良好的效果。     

针对重复纹理场景的跟踪定位算法

提出一种针对复杂标识的分类学习算法,并将其应用于移动增强现实系统中,实现了基于自然特征的跟踪定位系统.在场景特征点识别分类基础上,采用关键帧匹配算法实现无标识跟踪定位.针对含有对称结构的场景提出一种误匹配特征的回收机制.实验结果表明,该算法可解决由于场景对称结构导致的错误特征匹配,从而大幅提高特征的正确匹配率.     

一种免注册标识的增强现实方法

针对传统增强现实(augmented reality, AR)技术中标识信息和虚拟信息需要提前置入、虚拟模型的显示受标识信息限制的问题,提出一种免注册标识的增强现实方法。以C/S(客户端-服务端)架构为载体,采用用户数据报协议(user datagram protocol, UDP)传输信息,首先以HoloLens为客户端采集目标信息,随后服务端通过迁移学习训练的卷积神经网络来识别目标信息,最后客户端依据识别结果从服务器中动态加载虚拟模型。通过实验证明,该方法在开发过程中无需注册标识信息,对目标信息的识别准确率高,虚拟模型的显示免于对标识的跟踪,从而提高了AR的实用性,也可以更好地适应新场景需求。     

基于ARToolKit的增强现实系统的研究、开发及应用

介绍了增强现实系统的一个开发工具ARToolkit,讨论了基于视觉的增强现实系统的关键技术,并给出了其开发流程,最后介绍了增强现实系统在工业中的应用.     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-