仪表控制系统在石油化工中的应用探讨

介绍了仪表控制系统应用现状以及仪表控制系统在我国石油化工行业中的应用历史,具体分析了仪表控制系统的具体应用:计算机控制系统的应用、自动分析仪在石化企业的应用、先进控制在生产装置上的应用、制造执行系统(MES)在石化企业中的应用等,在此基础上探讨了仪表控制系统发展趋势。     

仪表控制系统在石油化工中的应用探讨

介绍了仪表控制系统应用现状以及仪表控制系统在我国石油化工行业中的应用历史,具体分析了仪表控制系统的具体应用：计算机控制系统的应用、自动分析仪在石化企业的应用、先进控制在生产装置上的应用、制造执行系统（MES）在石化企业中的应用等,在此基础上探讨了仪表控制系统发展趋势。     

物联网技术在现代数字图书馆的应用实践与思考

本文针对图书馆的现状,简述了物联网技术,特别是RFID传感器技术在现代数字图书馆中的应用前景,探讨了图书馆物联网应用系统的总体思路,给出了具体应用方案与实际应用的尝试,最后指出了现阶段物联网技术在图书馆应用的主要方向。     

“云计算”及其在图书馆的应用

介绍了云计算的概念和特征,阐述了云计算在图书馆的应用,并剖析了云计算在图书馆应用中存在的问题,指出了云计算在图书馆的应用前景。     

云计算在落后地区高职教育资源中的应用

当前,云计算在各行各业都有着不同的应用,本文探讨了云计算在落后地区高职院校的教育资源中的应用。主要对云计算对高职计算机基础课程教学改革中的应用;云计算对数字图书馆的应用;云计算在实践教学中的应用等三个方面来阐述了云计算的应用。     

高等数学教学中的逆向思维

高等数学知识点的应用是双向的,可分为正向应用和逆向应用,笔者在文中阐述了逆向应用在高等数学中应用问题.     

变频节能技术在我国煤矿机电设备中的应用

变频技术具有良好的节能效果和平缓的机械调节功能,在我国矿山机电设备中得到了越来越广泛的应用。本文简单介绍了变频技术的发展情况,并通过变频器在机械动力负荷设备中的应用实例,介绍了变频技术在我国煤矿大型机电设备中的应用,最后就变频技术在煤矿机电设备中的应用做了应用展望。     

播客在高校图书馆的应用探讨

介绍了播客的含义、传播特点以及在国内外的应用现状,分析了播客在高校图书馆应用的优势,探讨了播客在高校图书馆的应用。     

扩展的RSA算法在智能卡中的应用

在智能卡的应用与推广中,安全性是最重要的。密码技术的应用拓宽了智能卡的应用范围。本文将目前在理论和实际应用中较为成功的RSA算法扩展到Gauss整数域,并将这一算法应用于智能卡中,提高了智能卡应用的安全程度,从而拓宽其应用范围。最后,讨论了RSA算法和智能卡的结合在实际应用中的前景和有待解决的问题。     

基于GPS技术的土地管理应用研究

本文基于笔者多年从事土地管理的相关工作经验,以GPS技术在土地管理中的应用为研究对象,研究分析了GPS在地籍测量、勘界测量和土地资源动态监测中的应用,论文首先探讨了3S技术的集成与应用,在此基础上,笔者分析了GPS技术在土地管理中的应用现状及GPS在土地管理应用中存在的问题。     

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.