浅谈虚拟仪器技术及应用

论述了虚拟仪器(VI)的本质特征和技术特点，虚拟仪器技术在实验室研究和工业自动化领域中的应用以及虚拟仪器的集成环境与开发平台LabVIEW。探讨了自动测试仪器系统新的发展方向——智能测控网络。     

一种用于测试技术教学实验的网络虚拟仪器实验室

网络虚拟实验室是目前国内外研究的热点和实验教学的发展方向,本文综合利用计算机技术、虚拟仪器技术和网络技术,提出了基于网络的虚拟仪器实验室的系统结构。本系统以测试技术教学实验室建设为对象,针对测试专业特点,基于浏览器/服务器构架和LabVIEW软件,设计虚拟仪器实验室平台,并将虚拟仪器在网页上进行发布,用户可通过浏览器访问和操作仪器,并实时观察结果。     

高校实验室虚拟仪器建设探究

计算机技术与测试测量仪器技术的结合,出现了新的测试仪器—虚拟仪器,高校实验室运用虚拟仪器技术能够达到共享硬件和软件资源,快速、方便地组建各种自动测试系统。从硬件、软件和整体设计等方面论述了虚拟仪器的相关内容,探讨了高校实验室虚拟仪器建设方法。     

基于虚拟仪器的网络实验室的研究及实现

对虚拟仪器网络实验室应用系统结构模式进行分析描述，在AD-300实验仪硬件基础上进行系统构建。结合虚拟仪器技术、数据库技术、Web技术进行系统实现。实验结果表明，该实验系统不仅可实现仪器资源共享。而且可为学生提供不受时间和空间限制的虚拟网络实验平台。     

基于ActiveX控件的网络虚拟仪器实验室

探讨一种如何利用ActiveX控件创建网络虚拟仪器实验室的通用方法，并创建了网络虚拟仪器实验室，整个系统基于浏览器／服务器构架，在VB6．0环境下采用ActiveX控件技术设计出虚拟仪器，并将其制作相关的网页通过Internet向外发布，用户通过浏览器向Web服务器提交命令和参数，远程控制实际的仪器设备，实时观察结果。     

网络化虚拟仪器实验室监控平台系统的开发

本文通过研究目前社会流行的网络化虚拟仪器监控平台技术,开发了网络化虚拟仪器实验室监控平台系统,编制相应界面显示主机的各类界面信息,通过Web技术和以太网通信方式,在实验室网络环境向用户发布监控主机工作页面信息。     

基于局域网的虚拟实验室建设研究

对虚拟实验室系统的实施方案进行研究，提出了基于局域网的虚拟实验室框架模型，进而研究了虚拟仪器程序的设计及其网络化技术．用户只需具备基本的计算机和网络条件，就可以随时随地访问虚拟实验室进行实验．     

基于虚拟仪器技术的实验室测控系统软件设计

利用虚拟仪器技术对实验室振动测控系统进行了开发,即在LabV IEW应用环境下完成了虚拟仪器实验室振动测试现场仪器控制的设计,实现对多功能转子实验台中转子上某些点的位移、转速、加速度等数据的记录、处理,并得到相应的频谱图。该测控系统是对高职院实验室改革的有益探索。     

基于LabVIEW的数字信号处理网络实验教学系统

将虚拟仪器技术和网络技术应用于虚拟实验室的开发,构建了基于网络的数字信号处理虚拟实验室系统。通过虚拟仪器来实现数字信号处理实验,为学生提供网络化、开放式的实验环境,实现学生通过互联网远程操作实验获取信号波形和实验数据,有助于实现实验教学资源的共享。     

高校开放式网络虚拟实验室研究

网络虚拟实验室是高校现代实验教育技术发展的必由之路,分析了网络虚拟实验室及其特点,探讨了网络虚拟实验室的系统结构、虚拟仪器的建模、系统组成、环境要求、工作流程和实现技术。     

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.     

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.     

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。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

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     

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

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.