基于PMAC的转台运动控制系统开发

介绍了一种以DSP为核心的多轴运动控制器(PMAC)，提出一种基于PMAC的转台运动控制系统的方案，分析了控制系统的软、硬件结构和实现，基于Windows操作系统平台，利用面向对象的软件开发技术进行了软件开发，实际控制效果表明所提出的运动控制系统满足了转台实时运动控制的要求．     

基于PMAC的通用测量仪操作面板功能的实现

PMAC是当今最常用的运动控制器之一,操作面板是实现测量仪手动控制的关键部件。文中主要介绍基于“IPC＋PMAC”开放式运动控制系统的操作面板的硬件结构,并结合PLC技术和Visual C＋＋技术,开发了操作面板的控制程序,实现了所需的功能。     

PMAC在地毯簇绒机横动控制中的应用

叙述了地毯簇绒机中横动运动的伺服控制,提出了基于可编程多轴控制器(PMAC)运动控制卡的半闭环控制系统.介绍了控制卡的硬件和性能,对控制过程进行了说明,并给出了运动参数计算公式和运动程序.     

激光加工控制器的研究应用

本文通过提高了激光加工控制器的控制方法出发,将气体激光切割等各种先进技术引入到浙江工贸职业技术学院的激光加工中心来,根据学院实际设备提出了基于气体激光数控技术的激光加工管理系统。本管理系统具有较好的可靠稳定性,激光加工切割控制器在硬件上,利用工业PMAC、工业计算机构成了完整的上下位机式的激光加工数控系统。由工业计算机控制管理和人机接口界面,实现加工中由PMAC来控制运动的实时性。实现了激光加工切割控制器的协调控制作用。     

基于VC++与PMAC的机器人控制软件的开发

以IPC+DSP作为六自由度工业机器人的控制器,设计了一种基于可编程多轴控制器PMAC(ProgrammableMulti-Axis Controller)的开放式机器人控制系统.采用Visual C++编制控制程序,将机器人系统中管理、控制功能的实现分为若干个模块,负责底层伺服驱动的函数利用PMAC运动语言编写,可直接调用.整个控制软件能完成数据及运动状态显示、伺服驱动、机器人路径规划及定位等任务.实践证明该机器人控制系统运行平稳.     

基于PMAC开放式数控系统的开发研究

讨论了开放式数控(CNC)系统的3种实现途径；论述了PMAC(programmable multi-axes controller)多轴运动控制器的硬件和软件的开放性；介绍了以工业控制机为平台、以PMAC为核心自行开发的开放式数控系统硬件和软件实现的相关技术．     

采用模块化思想的汽车电器智能化设计方法

为了提高整车传统电器智能化设计的工作效率,提出一种基于模块化思想的汽车电器智能化设计方法.将控制器的硬件电路和软件算法分解为一系列标准模块,将模块按所设计的结构进行合理组合,即可完成各种电器控制器软硬件的设计.利用该方法完成了某大客车传统电气系统的智能化改造,应用模块化的设计方法,显著简化了标准化控制器软硬件的开发过程,大大减少了设计和调试的工作量,与传统设计方法相比,缩短了整车控制器的开发周期约50%.实车验证表明,控制器硬件结构简单、清晰,软件算法具有很好的一致性和规范性.     

基于PLC的智能汽车泊位系统设计

本文选用欧姆龙CX-Programmer为系统软件开发,采用CPM2A整体式可编程控制器(简称PLC),并结合强电与弱点知识,设计了一种新型汽车泊位控制器.文章详细介绍了泊位系统的结构、工作过程、硬件电路的设计、硬件的实现等.该系统具有操作简便、自动化程度高、运行速度快、可靠性高等特点.     

基于可编程运动控制器的开放式数控系统

介绍了开放式数控系统的特点,提出了一种基于可编程运动控制器(PMC)的开放式数控系统的硬件及软件系统的结构及其设计方法.     

基于Linux的五轴联动电火花加工数控系统

针对多轴联动电火花加工数控系统的设计要求,开发了一种基于PC和Linux开放式平台为上位机、可编程运动控制器(PMAC)为下位机的五轴联动电火花加工数控系统.利用Linux开源性好的特点,设计了环境友好的人机交互操作界面以及各类完成非实时任务的程序模块等;基于PMAC系统开发了伺服进给回退运动、主轴高速抬刀运动、五轴联动及各类摇动程序等.通过将数控系统应用于五轴联动电火花加工机床,进行了闭式整体涡轮叶盘样件以及窄缝窄槽等典型零件的加工实验,取得了良好的加工效果.     

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.