城区内道路上检查井施工的质量控制及安全措施

本文主要是分析城区内道路上检查井出现问题,产生的原因分别从设计方面、施工方面、管理方面来探究,采取有效措施减少这些问题的出现,来减少和避免安全事故的发生。     

排水检查井设计与施工质量控制

文章通过对现状排水检查井的病害及其成因分析研究,从设计和施工方面提出一些优化措施,以保证排水检查井设计施工质量,从而保障其功能正常发挥及行车安全。     

大同市街道改造中检查井施工技术探讨

本文结合大同市雁同西路的道路改造,从检查井基础设置、结构、施工工艺和井身材料四个方面分析了检查井周边路面开裂等产生的原因,提出加深基础埋置、改进井圈座结构、路面铺油与井圈提升同步施工及改革井身材料的四个技术措施来预防井口周边路面开裂的思路,可供设计及施工参考。     

机械顶管在龙子湖内环路污水工程中的应用研究

通过对比开槽排管、人工辅助顶管、机械顶管等相关施工工艺,合理、有效地解决了长久以来在地下水位较高的砂性土中进行超深排水管道施工的难题.阐述了机械顶管及检查井的施工技术要求,并在机械顶管工艺设计中提出了沉管式检查井新技术,解决了超长距离机械顶管同排水管道养护的矛盾.     

市政道路检查井井周路面沉陷分析及防治措施

通过引用公路工程中桥头跳车现象的产生机理,分析了市政道路中检查井周围路面沉陷、跳车的成因,探讨了在设计与施工过程中如何防止上述问题的发生.     

浅析市政排水管道施工

随着我国经济的快速发展,城市建设离不开排水管道工程,排水管网的结构稳固和功能保障是城市排水安全的重要保证。本文结合市政管道的施工实践,从施工准备、管道检查井施工、试验及回填等方面,就市政明挖排水管道的施工进行了探讨。     

论给排水常见问题及对策

本文结合住宅小区室外排水的质量要求，从排水分干道设置、平坦地面的处理、不同设置标高问题、检查井中对流问题、施工质量问题五个方面分析了给排水常见问题及对策。     

小城市市政排水管道工程质量通病分析及预防措

小城市市政排水管道工程质量的通病有四个方面的原因:1、管道积水2、管道渗漏5、检查井变形、下沉4、回填土沉陷.避免排水管道工程质量通病,可以采取以下措施:根据现有规划在施工中做好前期测量和设计工作,在设计中要反复对比研究,定出最佳方案,并严格按照施工规范施工,坚决杜绝不合格产品,克服不良人为因素,注重对整个施工过程实施有效的动态管理,严格人员、材料,设备的合理配置,控制各种试验及检测.     

兰州市市政道路检查井周边路面质量缺陷及质量改进措施研究

检查井是市政道路和市政管网中的重要组成部分,对于城市管网的定期检查,清理疏通和检修维护具有重要意义。但是,市政道路检查井周边路面普遍出现了沉陷,开裂,甚至松散坑槽等病害,严重影响了行车安全性和舒适性以及市政道路外观的完整性和美观性。本文以兰州市市政道路外观检查为基础,分析检查井周边病害的主要类型,研究病害产生的原因,并提出相关的设计优化措施及施工质量控制要点。     

浅析道路检查井井盖的沉降及周边道路质量通病的防治

通过对沥青混凝土路面检查井井盖和井周路面病害状况的分析，究其原因在于检查井井盖和周边路面的交通、材料、施工、养护和井盖质量等存在问题，从而提出解决道路检查井井盖的沉降及周边道路质量通病防治的措施。     

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.     

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.