热电偶自动检定装置

将传统的手动热电偶检定装置改进为自动检定装置 ,实现了自动连续检定。通过引入改进的PID控制算法 ,有效地改善了炉温大滞后过程启动和间歇大扰动的动态品质。独特的冷端补偿方法有效地减少了冷端补偿引入的误差。利用参考函数使温度和热电势之间的转换很方便。热电偶的自动检定 ,能减轻大量繁琐的操作工作量 ,提高工作效率和检定质量 ,也能有效地减少人为误差 ,而且对节约能源和实现检定的社会化开辟了新的途径。     

再谈热电偶冷端温度补偿

对热电偶的测量原理、冷端补偿做了详细的论述。经过推论说明在热电偶回路中接入第三种金属导线时，只要两端的温度相同对热电偶所产生的热电势数值并不影响热电偶的测量结果。基于这个原理经过合理的接线既能消除安装过程中所出现的新的冷端产生的误差，又能达到同步跟踪补偿冷端温度，保证温度指示准确无误，减少投资提高效率。     

智能温度监测系统

利用微处理器技术,通过使用查表法对热电偶温度传感器在实际测温过程中由于冷端温度变化产生的误差实现自动补偿,从而提高热电偶测量精度的技术。     

一种消除热电偶冷端温度影响的方法

本文介绍了一种热电偶冷端温度补偿电路,当冷端温度在-25℃～+55℃范围内变化时,该电路能自动消除冷端温度的影响,其误差不超过±0.5℃,且具有放大热电势信号所需要的增益。     

钢水连续测温智能检测仪表开发研制

介绍钢水连续测温智能检测仪表的工作原理及其所特有的热电偶冷端高温自动补偿技术，其突出特点是采用多级补偿措施和智能化手段圾效地解决了热电偶冷端环境温度在几百度随机变化的高温条件下的自动补偿难题。     

基于DS1620和80C51的热电偶冷端自补偿高精度数字测温系统

利用数字式温度测控芯片DS1620作为K型热电偶的冷端温度实时测量和超限报警单元,利用集成运放ADOP07和模数转换器AD574A组成热电动势预处理单元,利用80C51单片机作为智能处理单元,根据热电偶中间温度定律,实现了具有热电偶冷端温度自补偿功能的大范围高精度自动数字测温系统。     

待发表文章摘要预报

待发表文章摘要预报钢水连续测温智能检测仪表开发研制钱洪俊沙骏介绍钢水连续测温智能检测仪表的工作原理及其所特有的热电偶冷端高温自动补偿技术，它是采用多级补偿措施和智能化手段，有效地解决了高温范围的补偿从而提高了测温精度．在线黑体辐射源的建立及其精度评价...     

热电偶测温中冷端温度补偿电桥的改进

热电偶是测量温度时最常用的传感器。由热电偶测温原理可知,只有在冷端温度保持恒定的情况下,热电偶的热电势才是热端温度的单值函数,才能正确反映热电偶热端温度（被测温度）的数值。在实际应用时,冷端温度常随环境温度的变化而变化。为了消除冷端温度变化对测量精度的影响,必须进行冷端温度补偿。冷端温度补偿的方法很多,补偿电桥是最基本、最常用的方法。本文就目前我国许多补偿电桥生产厂家所生产的补偿电桥所存在的问题提出了改进方法,来提高冷端温度的补偿精度。 1电桥补偿原理及存在问题 1.1电桥补偿原理 　　补偿电桥法是利…     

特高压电流互感器自动化检定系统设计与应用

为解决特高压电流互感器现场检定难题,研究特高压气体绝缘组合电器(GIS)电流互感器自动化检定系统。该系统主要包括智能工频电源、大容量升流器、无功补偿装置、标准电流互感器等关键部件。智能工频电源具有功率电子电源与电工电源串联输出、回路参数计算、无功补偿控制和误差检定等功能。采用一次绕组串并联的方法,设计了大容量升流器。采用原边和副边并联补偿电容器的方式,设计了多组合无功补偿装置。通过了省级计量测试机构测试和国家电网公司重点特高压工程电流互感器现场检定试验。结果表明,该检定系统能够实现特高压GIS电流互感器一次回路参数精确测量、升流器原副边混合无功补偿装置带电自动投切、误差自动检定,有效保证了7 200 A大电流检定点和15 A小电流检定点的精确快速定位,减小了对现场电源和升流器的容量需求。     

利用单片机提高温度测量精度

介绍如何利用单片机对热电偶测量装置中对热电偶的非线性，冷端温度的补偿，以及运算放大器零漂和数值转换关系Av实时测出的处理方法，提高了温度控制领域中温度的测量精度。     

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).     

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.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.