基于虚拟仪器的低频扫频仪设计

为满足低频范围内频域分析的需要,克服普通扫频仪不足之处,设计了一种基于虚拟仪器的低频扫频仪.介绍了该扫频仪的设计方法、工作步骤,提出了一种预扫频的方法,使扫频的效果与效率得到兼顾.本设计以模块板卡PXI-5421和PXI-6251为硬件基础,使用图形化开发环境LabVIEW进行程序开发.经测试,该扫频仪运行准确,增强了整个测试系统的功能.     

MiniGUI在混合动力汽车数字仪表系统中的应用

针对汽车仪表发展的新趋势,探讨了基于嵌入式操作系统Linux,同时采用自由软件MiniGUI开发的混合动力汽车数字仪表系统的图形用户界面,来实现未来汽车仪表的数字化。本系统选用三星S3C2410作为系统的CPU,采用MiniGUI开发的显示信息的应用程序在Linux操作系统上运行,实现当前混合动力汽车的车速、电池电量等信息的实时显示。     

基于虚拟仪器的温度采集系统设计

利用NI公司的第三代数据采集硬件驱动程序DAQmx,研究开发基于虚拟仪器的温度采集系统。通过PXI-6251和SCXI-1102温度采集模块配合,外接K型热电偶,以LabVIEW 8.6软件为开发平台,实现了温度信号的采集和处理平台。此平台可以用于学生课上演示数据采集的过程,也可以用于科学研究。     

汽车数字仪表盘图形界面显示研究

数字化和智能化的虚拟仪表是汽车仪表的发展趋势.详细介绍了Windows CE操作系统下基于对话框的汽车仪表盘图形显示界面的设计与实现,阐述了仪表盘显示界面的设计过程、GPS导航等问题.所设计的仪表盘是一种崭新的汽车仪表概念,汽车仪表不再仅仅是一个显示信息的工具,还是一个会分析、处理信息并控制执行的系统.     

基于PC／104的车载虚拟仪表的设计

通过对汽车传统仪表的分析比较，根据汽车电子的发展趋势，提出了基于PC／104系统的车载虚拟仪表的设计思想和车载虚拟仪表的总体设计方案、系统构成、工作原理及软硬件设计，并成功地研制出实验样品．该车栽虚拟仪表通过CAN总线进行数据传输，可对车况进行实时监控、显示，对超限工况报警和自动记忆存储，并可根据用户实际需求扩展功能．     

汽车发电机整流器故障虚拟仪器检测实验研究

针对汽车发电机故障的检测问题,研究虚拟仪器对汽车发电机进行检测的方法,提出了基于LabVIEW的汽车发电机虚拟仪器检测系统的组成,并对检测系统的原理进行了论述.实验表明:采用虚拟仪器检测方法,可以快速检测、判断、演示汽车发电机故障.     

基于PXI-6259的起重机参数检测系统设计

根据四倍频计数原理,利用LabVIEW图形化开发平台和PXI-6259数据采集卡,通过对调理后的增量式光电编码器输出脉冲进行定时采样、四倍频计数和算法处理,设计了一套可用于不同起重机设备的高精度参数检测系统,其中加入了数据实时存储模块,并在交流伺服电机控制系统中进行了验证。实验结果表明,该系统实时性好,测量准确,人机交互界面友好,并有效扩展了M法的应用范围。     

基于嵌入式系统的CAN总线汽车组合仪表的研究

应用CAN总线技术提出了一种基于嵌入式系统的汽车组合仪表的设计方案,构建了以嵌入式微处理器LPC2119为汽车组合仪表的控制核心,μC/ OS-Ⅱ实时操作系统为该系统的软件平台.详细介绍了该种汽车仪表的电路组成、工作原理和软件编程思想.     

基于车载网络的汽车数字仪表系统设计

随着控制单元数目的不断增多,汽车电控系统结构日趋复杂.针对某天然气城市客车设计了一种基于车载网络的灵活性强、可靠性高的数字仪表系统,该系统开发采用了组件化设计方法,基于HCS12嵌入式处理器,通过CodeWarrior软件开发平台和Vspy3故障诊断平台实现系统的快速开发.系统中包括基于CAN的仪表信息模块和步进电机式仪表盘,不仅可以直观地显示车辆运行信息,还能够通过总线接口实现故障诊断.试车运行结果表明,该系统达到了良好的运行效果,稳定可靠.     

基于LabVIEW的汽车刹车盘摩擦磨损特性信息采集系统设计

良好的制动性是汽车安全行驶的必要条件,而刹车盘的摩擦磨损性能在整个汽车制动系统中起着举足轻重的作用。为便于获取用于刹车盘摩擦磨损特性表征的压力、摩擦力、转速、温度等参数信息,本文基于虚拟仪器技术LabVIEW设计了刹车盘摩擦磨损特性信息采集系统。该系统的硬件部分主要包括用于获取刹车盘特性参数的传感器,以及传感器输出信号调理模块和用于A/D转换的数据采集卡;在虚拟仪器技术LabVIEW环境下编写了信息采集及处理界面和历史信息查询界面的程序。调试运行结果表明,该信息采集系统可以实现对刹车盘摩擦磨损特性参数的准确采集与实时显示以及对所采集数据的简便查询,能够满足刹车盘摩擦磨损特性信息采集的要求。     

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.     

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.     

A computer generator for randomly layered structures

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

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.