共查询到20条相似文献，搜索用时 171 毫秒
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结合近10年的Lotus Domino/Notes系统开发和管理经验,从系统物理安全、操作系统安全和应用系统安全三个方面详细论述了Lotus Domino/Notes系统的安全防护。 相似文献
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苏锡常地区地面沉降地质结构三维可视化模型虚拟现实系统研究 总被引：2，自引：0，他引：2
从苏锡常地区地面沉降研究实际需要出发,介绍了利用虚拟现实技术构建地面沉降地质结构三维可视化模型虚拟现实系统的设计思路、开发模式、实现方法和功能特点。该系统真实表达了研究区三维地层结构特征,逼真再现了地面沉降模型所预测的地下水流场、地面沉降发展变化过程,并虚拟表现出地面沉降可能造成的后果,为苏锡常地区地面沉降机理及预测研究提供了一个全新的三维可视化平台。 相似文献
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虚拟现实技术以其具有的沉浸感、交互性、实时性、构想性等特点而越来越为广大地学工作者所关注。本文首先介绍了虚拟现实系统的组成,之后综述了近几年国内外地球科学部分领域应用虚拟现实技术的研究文献。与传统方法相比,虚拟现实技术在很大程度上提高了科学研究的效率,能提供更丰富的可视化和交互环境,使科学家能够操纵多达GB甚至TB级数据,以一种身临其境方式来对研究对象进行观察、分析和实时操作,而无需科研人员到达现场。通过虚拟现实系统,能将尽可能多学科的数据放到同一个环境下,增强科研人员研究问题的深度和广度,避免得出错误结论。同时能重塑不可再生资源,避免了在科学研究的同时对其造成的破坏,有助于科学知识在公众中的传播。与西方发达国家相比,我国的（沉浸式）虚拟现实技术在地学领域的应用还处在起步阶段,在拥有大量高精度LiDAR地形数据的活动构造等领域亟待引入该项技术,以一种全新的视野来重新审视地球科学研究,并推动该学科在未来的发展。 相似文献
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An end-member analysis was performed using algorithms ofExtended cabfac qmodel on 21 sample distributions of vitrinite reflectance (VR) by depth from the Inigok well in the National Petroleum Reserve of Alaska (NPRA). Eight end members, which account for 99% of the variance, adequately recreate the VR distributions. These eight end members contain stratigraphic information based on systematically increasing or decreasing mixing proportions with depth. Paleoheat flux determined from end members, or from orthogonally filtered sets of end members, is not significantly different from paleoheat flux determined from arithmetic mean values of VR, indicating that the arithmetic mean provides an adequate representation of each VR distribution analyzed in this well. Additionally, use of filtering devices to assess the degree of trustworthiness of signal in VR distributions enables an assessment to be made of the degree of stability of paleoheat flux variation estimates. 相似文献
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资源环境科学多维信息平台研究 总被引：4，自引：1，他引：4
资源环境信息（地理信息）具有时空特点，其种类复杂、获取渠道多样、具有多种比例尺和分辨率以及不同的表达方式，因此，资源环境信息是多维的。遥感（RS）、地理信息系统（GIS）、全球定位系统（GPS）和数据库（DB）等现代信息技术为资源环境科学的发展起了巨大的推动作用，是资源环境科学由以定性描述为主走向定性、定量、定位综合研究的技术基础。然而，面对多维的资源环境信息，要构建一个具有多维信息表达方式、人机和谐、交互性和参与感强、满足资源环境科学研究人员需要的多维信息处理平台，仅靠这些技术是不够的。作为现代信息技术发展的重要分支，虚拟现实（VR）技术适应了这一形势发展的需要，它已经在许多领域得到广泛的应用。在描述资源环境科学多维信息特点的基础上，重点探讨了如何利用虚拟现实技术及其它信息技术构建满足研究人员需要的资源环境科学研究多维信息平台、它的功能以及实施方式。 相似文献
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虚拟现实和G IS系统集成方法分析 总被引：1，自引：0，他引：1
从三个角度论述虚拟现实(V irtua l R ea lity,VR)和地理信息系统(G IS)集成的必要性,通过对集成方法的归纳,提出4种集成方式,并详细介绍了各自的结构体系和具体特征。在此基础上划分了VR与G IS系统集成的4个阶段,分析当前系统集成现状,指出其发展趋势。同时探讨了VR和G IS系统集成中存在的关键问题,包括数据、虚拟景观技术、VRG IS网络化等,给出目前解决这些问题的一些建议和具体途径。 相似文献
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Lars Bilke Thomas Fischer Carolin Helbig Charlotte Krawczyk Thomas Nagel Dmitri Naumov Sebastian Paulick Karsten Rink Agnes Sachse Sophie Schelenz Marc Walther Norihiro Watanabe Björn Zehner Jennifer Ziesch Olaf Kolditz 《Environmental Earth Sciences》2014,72(10):3881-3899
Scientific visualization is an integral part of the modeling workflow, enabling researchers to understand complex or large data sets and simulation results. A high-resolution stereoscopic virtual reality (VR) environment further enhances the possibilities of visualization. Such an environment also allows collaboration in work groups including people of different backgrounds and to present results of research projects to stakeholders or the public. The requirements for the computing equipment driving the VR environment demand specialized software applications which can be run in a parallel fashion on a set of interconnected machines. Another challenge is to devise a useful data workflow from source data sets onto the display system. Therefore, we develop software applications like the OpenGeoSys Data Explorer, custom data conversion tools for established visualization packages such as ParaView and Visualization Toolkit as well as presentation and interaction techniques for 3D applications like Unity. We demonstrate our workflow by presenting visualization results for case studies from a broad range of applications. An outlook on how visualization techniques can be deeply integrated into the simulation process is given and future technical improvements such as a simplified hardware setup are outlined. 相似文献
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Even in the absence of associated skeletal material, isolated feathers in amber remain of high scientific interest. The remarkable preservation of these delicate structures in amber implies a potential for significantly improving our knowledge of feather evolution and diversity. A large sample set of 150 Burmese amber specimens (Upper Cretaceous, ~99 Ma) containing feathers is herein described. Several structural types can be differentiated, including flight feathers, contour feathers, semiplumes, and filoplumes. In some cases, peculiar pigmentation patterns and structural features can be documented. Additionally, different developmental stages have been captured in this assemblage with some examples of erupting feathers or neoptile plumage. Comparisons with previous studies, including skeletal material described in amber, show that Enantiornithes and non avialan dinosaurs are most likely represented in the assemblage, as well as unknown taxa. 相似文献
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水利信息化的不断发展,使得在防汛现场获得实时水文信息成为可能。分析了基于PDA的雨水情查询系统的关键问题,并介绍了系统设计和应用示例。系统以实时雨水情数据库为基础,基于移动网络技术和PDA设备,设计实现了随时随地查询防汛雨水情信息及各类图片文档等信息的功能,为防汛指挥决策提供了技术支撑。 相似文献
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Fengcheng Peng Tianrong He Zhenji Li Mengyu Chen Xiaoli Qian Lingxia Zeng Yiyuan Xu 《中国地球化学学报》2018,37(4):526-536
Based on the analysis of the enrichment characteristics of Hg and MeHg in bird feathers from Caohai National Nature Reserve in Guizhou, the risks of Hg pollution to the birds from Caohai wetland have been evaluated. The total Hg content of bird feathers ranges from 40 to 5058 ng/g with an average of 924 ng/g. The content of MeHg is significantly correlated with total Hg (r = 0.68, p < 0.01), and the content are among 0.75 and 113 ng/g. The total Hg content in the birds feathers is significantly dependent on their feeding habits, which is mainly in accordance with the following rule: carnivorous birds > omnivorous birds that are mainly carnivorous > omnivorous birds that are mainly herbivorous. There are also differences in the Hg enrichment ability in the different parts of bird feathers, and the total Hg and MeHg content in the wing feathers are significantly higher than that in the other parts of feathers. The bioaccumulation coefficients of aqueous Hg and MeHg by bird feathers are 0.9 × 104–112.13 × 104 (mean value is 20.47 × 104) and 0.47 × 104–70.4 × 104 (mean value is 9.52 × 104), respectively. Although the whole Hg level in Caohai bird feathers is not too high, the Hg content in some carnivorous birds exceeds over or approaches the abnormal threshold when birds are breeding (5 μg/g), which indicates that the birds in Caohai wetland are faced with some risks of ecological Hg pollution. 相似文献
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石志强 《华东地质学院学报》2002,25(1):88-89
简述了以ORACLE数据库为后台数据库、VB6为编程工具的用电营配管理信息多媒体查询系统的一些技术概念，介绍了C／S模式和方法，以便更好地阐述用电营配管理信息查询系统是如何通过多媒体技术来实现的。 相似文献