冷轧步进梁跑偏原因分析及其改进措施

为提高步进梁运送钢卷的作业效率,该文针对冷轧步进梁在使用中的故障最多的跑偏现象进行了分析,并结合实践,对步进梁进行精确调整,排除故障,解决了车轮跑偏问题,保证了生产,在实际生产中取得了良好的效果。     

胶带输运机防跑偏装置在矿井中的应用

根据同煤集团煤峪口矿胶带输运机生产遏到的跑偏问题，经改革创新对胶带运输机安装防跑偏装置后，胶带跑偏现象得到解决。     

如何防止与调整胶带输送机跑偏技术

胶带输送机作为工矿生产中一种主要运输设备，跑偏是输送机运转过程中极易出现的故障。文章指出要防止胶带输送机跑偏，安装与调试过程中应抓好几个重点步骤，并从多年的生产实践经验出发，对胶带输送机常见的跑偏现象的判别与调整方法进行了总结和介绍。     

煤矿开采皮带运输机跑偏问题及对策

该文在概述煤矿开采皮带运输机工作原理、优点,分析其跑偏主客观原因的基础上,探索性提出煤矿开采皮带运输机跑偏问题对策与建议;以其对煤矿开采皮带运输机跑偏问题的解决有所帮助。     

堆料机悬臂皮带机设计的改进

堆料机悬臂皮带机投入使用以来,皮带经常跑偏,改向滚筒表面护胶磨损严重,皮带出现磨损并且使用寿命较低.根据故障现象进行了分析,并对悬臂皮带机进行了重新核算与改进.通过改进,皮带机未出现异常打滑,皮带表面及接头处磨损不大,滚筒护磨损程度大为减小,取得了较好的效果.     

带式输送机胶带跑偏的现象分析与预防处理

本文从带式输送机胶带跑偏的现象入手,找出胶带跑偏的原因并提出相应的处理办法.并提出从安装与结构改造上,预防胶带的跑偏.     

汽车行驶偏跑故障检测

随着生活水平的提高,汽车的使用也越来越普遍,人们对汽车行驶的安全检测的重视程度也越来越普遍。汽车偏跑是汽车行驶过程中的常见障碍,会加快轮胎的损坏,严重时会使造成爆胎、车辆失控等引起的交通事故。跑偏故障主要有直线行驶跑偏和制动跑偏两种,造成跑偏的原因也有很多种,为了降低交通事故的频率,必须及时检测出跑偏故障并进行有效维护。本文分析了行驶跑偏故障现象,也对检测方法进行了探究。     

皮带跑偏原因分析与调整方法

皮带输送机是输煤系统的主要设备，皮带跑偏问题不仅严重缩短皮带的使用寿命，还降低输煤系统的工作效率。该文通过分析大唐林州热电有限责任公司3号输送机在运行过程中存在的跑偏问题，并结合其他单位先进技术和现场积累的经验，对皮带跑偏的原因和具体调整方法做了全面探讨。     

水平带式过滤机滤布跑偏浅析

水平带式过滤机滤布跑偏现象造成滤液外漏,使物料堆积在滤盘上,无法吸滤,造成滤布打折、变形、破裂,还造成传动辊粘料,加速跑偏.严重地影响了水平带式过滤机的正常运行,造成了一定的经济损失.其主要的原因是滤布各部位受力不均匀所造成的.就此,对影响滤布跑偏的所有力进行分析,总结出滤布跑偏的原因,制定出解决滤布跑偏的相应措施.     

带式输送机输送带跑偏的分析及处理

对带式输送机运转过程中输送带跑偏的现象进行了分析，提出了输送带跑偏的调整方法和预防措施。     

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.