利用MSComm控件实现与GPS接收器的串口通讯

串行接口由于其具有连接简单、使用方便、数据传递可靠等优点，在工业实时控制系统中得到了广泛应用。探讨了利用Microsoft Communications Control控件编写串行通信程序的方法，并结合开发实践，阐述了用VC＋＋语言实现了基于ActiveX技术的串行通信编程的一般步骤。     

多线程串行通信技术在发动机油门瞬态控制器中的应用

本文结合发动机油门瞬态控制器的开发实践,介绍和讨论了一种基于串行通信的实时控制与数据采集系统的设计和实现方法。为了解决串行通信实时性问题,采用了多线程设计思想,结果表明,应用程序运行效果良好,对实时串行通信软件开发具有实用意义和参考价值。     

实时控制系统MOXA多串口卡同步串行通信容错算法

针对高速实时控制系统中断响应延迟问题,以及MOXA C502多串口卡同步串行通信稳定性问题,提出一组纠错容错算法,解决GPS/B码误差对系统中断响应的影响,实现基于MOXA C502多串口卡的稳定可靠同步串行通信,在实际应用中取得理想效果。     

基于ARM处理器的UART设计

UART是用于控制计算机与串行设备的装置,在嵌入式系统中它操作简单、工作可靠、抗干扰强。本文介绍了一种近距离的通信方法．讲述了UART的原理和软件设计的改进,在ARM中采用串口通信技术,具有使用方便、程序简单、可读性好、工作效率高等优点,可以广泛应用于基于串行通信的各种场合。结果表明,此设计有助于提高数据传输的实时性。     

用Delphi语言实现上下位机的串行通信

介绍了Windows环境下在Delphi语言中利用TComm控件实现上下位机的串行通信编程，并给出了应用范例，此方法简单可靠，使用灵活，便于移植，且实用性较强，可供一般程序员在编写串行通信程序时参考。     

单片机与微型打印机的接口硬件设计

本文设计了以AT89S52为核心的微型打印机接口硬件,介绍了AT89S52单片机接口转换电路及微打的串行通信方法,此方法也可应用于其它类型的微型打印机及串行通信场合。系统可以无须通过微机直接打印,具有硬件构成简单、成本低、通信可靠的特点。     

PC机串行通信

提出了一种用C语言实现PC机串行通信的方法,分析了PC机串行通信原理,采用计算机自身携带的RS-232C标准接口进行通信。该方法程序小,硬件连接简单,且可应用到PC机与单片机或其它仪器仪表的串行通信中去,因此具有较广的使用价值。实验证明该方法能实现PC机的可靠数据传输。     

单片机与微型打印机的接口硬件设计

本文设计了以AT89S52为核心的微型打印机接口硬件,介绍了AT89S52单片机接口转换电路及微打的串行通信方法,此方法也可应用于其它类型的微型打印机及串行通信场合。系统可以无须通过微机直接打印,具有硬件构成简单、成本低、通信可靠的特点。     

柴油机微粒过滤器再生控制系统设计

针对柴油机微粒过滤器（DPF）难以实现自动再生问题,提出了利用AT89C52单片机实现可靠的DPF再生控制系统的解决方案,利用传感器和A／D转换电路设计了信号采集及处理单元,辅助设计了实时时钟电路和RS232串行通信电路,还特别设计了稳压电源模块．最后开发了系统软件,使系统能实行实时控制,保证了系统的自动化、智能化工作．实践结果表明该系统设计合理、运行可靠．     

利用录波技术查找串行通信故障

先简单介绍了查找串行通信故障的常规方法,并详细介绍了在使用常规方法失效的情况下所采用的一种新方法——利用录波技术查找串行通信故障。并结合工作实践详细介绍了该方法的具体操作及其使用经验。     

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.