AV63-12型轴流式高炉鼓风机的PLC控制

结合高炉鼓风机系统的工作原理和控制目标，提出了高炉鼓风机控制系统的结构和总体设计方案．讨论了防喘振控制、静叶调整、紧急停车系统（ESD）．实践表明，防喘振曲线的在线显示和控制已在风机的安全可靠运行方面发挥了重要作用．     

高炉鼓风机防喘振控制系统的分析与研究

本文首先探讨了轴流压缩机喘振发生机理及其危害,提出了高炉鼓风机防喘振控制的必要性,然后以某钢厂大型高炉鼓风机为例对防喘振控制系统作了详细分析与研究,同时在分析与研究的基础上对湛江钢铁高炉鼓风项目提出了一些合理的优化和改进建议。     

高炉自动拨风系统的应用

高炉冶炼过程中,因高炉鼓风机故障跳闸造成高炉坐料,风口灌渣。损失重大,针对冶炼过程中风机停机事故,结合工程实例,详细阐述高炉鼓风机拨风系统工艺控制流程的设计方案,实现3座高炉同时安全生产。     

高炉鼓风机选型和安装

针对高炉鼓风机的选型和安装中出现的问题，根据高炉操作对鼓风机的要求，提出了正确与合理的风机选型与鼓风机安装方式。     

安阳钢铁高炉汽轮鼓风机自动控制应用

高炉鼓风机组是高炉生产工艺的心脏设备,深入地对系统自动控制进行分析,为更好地维护检修仪表控制系统打下坚实的基础,并为鼓风机能更好地稳定运行做好程序控制。     

高炉鼓风机自动控制系统研究与应用

本文主要介绍了高炉鼓风机的结构与组成以及现场自动控制的系统结构.研究开发了高炉鼓风机的自动控制系统。经试运行，供风质量与效率均满足高炉的正常生产，该系统运行稳定。     

基于减压阀组调节的高炉顶压控制策略

为了提高钢铁冶炼的质量，优化高炉顶压的控制方法。以大中型高炉为研究对象，通过分析高炉的工艺流程及影响炉顶压力的因素，构建了高炉炉顶压力的数学模型。在此基础上探讨了一种基于减压阀组调节的高炉顶压控制策略—跟随比例积分微分（tracking proportion integral differential, T-PID）控制 。为验证此数学模型和控制策略的有效性，应用matlab/simulink搭建了系统仿真模型，仿真结果验证了该策略的正确性。将该方法应用于某钢1#高炉顶压控制系统，结果表明高炉顶压波动能控制在±3 kPa左右，具有良好的效果。     

LabWindows/CVI在高炉鼓风机组状态监测系统中的应用

介绍了计算机测控系统应用软件开发平台 Lab Windows/CVI及其在高炉鼓风机组状态监测系统中的应用。工业应用表明该系统能够有效地实现对高炉鼓风机组的稳态监测和启停态实时监测 ;作为新型的测控软件平台 ,Lab Windows/CVI极大地提高了软件开发效率及应用软件系统功能和性能。     

三元流叶轮技术在高炉鼓风机中的应用

本文主要论述了"全可控涡"三元叶轮设计与制造技术在高炉鼓风机中的应用及实践,提出了在目前技术条件下鼓风机组节能降耗与升级改造的可能性     

浅谈酒钢450M~3高炉定风压模式的应用

本文主要结合酒钢目前高炉供风现状,针对热风炉周期性换炉对高炉造成的影响,提出并实施鼓风机定风压技术,有效的补偿了热风炉换炉时的风量、风压变化,实现了热风炉无波动换炉,对稳定高炉生产起到了促进作用,有效的提高了高炉冶炼水平。     

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.