基于FPGA与PC/104总线的SPI接口设计

为满足嵌入式工业控制计算机通过PC/104总线实现对具有SPI接口的程控放大器控制的需要,在研究了PC/104总线和SPI总线通信协议的基础上,首先介绍了SPI总线和PC/104总线的结构和工作时序;提出基于FLASH架构FPGA芯片的PC/104总线转SPI总线接口设计方案,给出了SPI控制状态机的设计思路,并用ModelSim仿真软件进行了仿真验证,最后通过仿真和实验验证了设计方案的正确性和可行性.     

STD总线接口电路设计

介绍了PC104总线和STD总线概况,采用总线隔离技术、总线锁存技术、译码技术、输入/输出技术设计了PC104总线与STD总线之间的接口扩展卡,阐述了接口扩展卡的电路设计及其所具有的优点。     

基于RS-485标准的供电系统微机监控的接口设计

设计了PC机和单片机连接RS-485总线的接口硬件电路,以及软件协议和通信软件。该技术可应用于供电系统微机监控,监控系统中主控机（PC机）通过RS-485总线网络联结从机（单片机）,从机联结相应的传感器和继电器,从而实现供电系统的远程检测监控。     

非标数字装备通用控制器软件系统设计

本文提出了一种基于Windows CE嵌入式的非标数字装备通用控制器,主控模块选用基于PC104总线的主板,再在主板PC I插槽上嵌入运动控制卡和内置PLC模块,实现对伺服电机的控制,进而实现所需要的工业控制。本文在已有的硬件设备上进行整体的软件系统的设计,并对整体软件架构进行了详细的阐述.     

基于DSP的PC104总线多功能串行通信卡设计

针对工程需要,完成了基于数字信号处理器(DSP)的PC104总线多功能串行通信卡的硬件电路和相关基础软件的设计与调试.实验证明,采用TMS320F2812DSP能够实现异步串行通信、同步串行通信、CAN通信3种不同协议的串行数据接收与发送.通过PC104总线驱动双口RAM方式可以方便地嵌入PC104总线计算机,实现多形式串行通信功能的扩展.     

嵌入式PC104在不接触电法测量中的应用

在不接触电法测量中,为了清晰精确地观测发射机发出的经过空间和地下介质耦合的微弱信号,设计了不接触电法测量仪器的嵌入式智能化系统.该系统以嵌入式PC104计算机作主控单元,采用可编程逻辑器件作为硬件接口电路,在Borland C 环境下,编制了基于UCDOS的控制、采集驱动和数据处理程序.通过实验数据表明,该仪器接收到的信号是地下介质的真实反映.基于嵌入式PC104的系统设计方案可用于更多其他控制过程较复杂、工作环境恶劣和背景噪声大的测量控制场合.     

基于PC/104冲床装模高度监测控制器的研制

针对冲床装模过程中由于人工操作而引起的误差大、效率低等问题,设计了一种基于嵌入式计算机系统的装模高度监测控制器.该控制器选用PC/104总线单板电脑作为主控制器,配合于外部的SSI接口数据采集、人机交互和电机控制模块,实现对模具信息管理,装模高度监测及控制等功能.该控制器精度高、功耗小、成本低、结构坚固,特别适于小型冲床设备的加工过程及操作现场,有较好的市场应用前景.     

基于FPGA的高速PCI采集卡设计

提出一种基于FPGA的高速PCI采集卡的设计方案,详细介绍了系统的硬件和软件结构,分析了FP-GA内部各个模块的功能和原理,并着重描述了PCI接口模块IP核的设计.通过将数据采集的控制模块和PCI接口模块集成在FPGA内部,加上采用双口RAM技术,实现了数据高速采集、传输和存储.该系统集成度高、设计灵活、电路简洁、可扩展性好、抗干扰能力强,适用于航空综合检测设备和智能仪器等高速数据采集场合.     

PC104嵌入式计算机在海底大地电磁信号采集中的应用

为了观测海底大地电磁数据,设计了海底大地电磁探测仪器的智能化方案,即以性能优良的PC104嵌入式计算机作主控单元,编制采集驱动程序,采用合理的硬件接口电路,在非实时监控的运行环境下采集整个海底大地电磁信号.用该仪器系统能记录水深在100m以下的极其微弱的海底大地电磁信号测量数据表明,此信号是海底在地球物理场的真实反映.     

PID模糊控制技术在热交换机组控制系统中的应用

以热交换机组控制系统为例,阐述了以PC/104总线模块为主控单元的模糊参数自定PID控制系统设计。对循环水温度的自动控制与调节是换热机组自动控制的核心,根据控制对象(为供热管网)面积大、分布不均匀、随机性较强、很难建立其数学模型等特点,结合当前的模糊控制理论,提出了一种基于模糊控制的自整定PID控制器,并用软件设计的方法加以实现。     

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…     

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).     

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.     

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.