浙江舟山大陆连岛工程H匝道静动载试验研究

为了测试某互通立交匝道的整体受力性能,对该桥进行了静、动载试验,通过将理论计算和试验数据进行对比分析,对该桥的整体受力性能和承载能力进行了评价.试验结果表明:该桥在静载作用下各控制截面的应变和变形满足设计要求,在动载作用下的振动频率和振动阻尼比与理论计算结果吻合较好,该桥的强度、刚度和动力特性皆满足设计要求.     

基于ANSYS对某大桥引桥进行承载能力分析

某大桥的引桥经过多年的运营出现了一些病害,为摸清该桥的承载能力以及使用性能,基于通用有限元程序软件进行理论计算。同时根据理论计算结果作为控制内力进行现场检测试验,试验结果表明该桥引桥部分使用性能较好,承载能力满足有关规范的要求。     

某大桥引桥承载能力分析

某大桥的引桥经过多年的运营出现了一些病害,为摸清该桥的承载能力以及使用性能,基于通用有限元程序软件进行理论计算,同时根据理论计算结果作为控制内力进行现场检测试验,试验结果表明该桥引桥部分使用性能较好,承载能力满足有关规范的要求。     

钢管混凝土系杆拱桥施工分析与施工控制

为了保障钢管混凝土系杆拱桥施工安全和质量,以南水北调中线工程某钢管混凝土系杆拱桥为例,采用有限元软件MIDAS/Civil建立该桥有限元计算模型,按照施工过程详细分析各施工阶段的变形、吊杆力和应力,对吊杆成桥张拉力进行探讨,并选用自适应控制方法进行现场施工控制.由数值分析和现场监控结果可以得出,大桥在施工过程中结构的变形较小,受力满足设计规范要求;考虑到钢管混凝土系杆拱桥拱肋、系梁的刚度相对较柔,可采用恒载索力作为成桥张拉索力控制值,并以成桥后系梁和拱肋线形作为吊杆索力调整的施工依据;施工控制表明成桥线形和受力满足设计要求,成桥索力与恒载索力基本吻合.     

基于静载试验的桥梁检测及安全性评价

桥梁静载试验主要测试桥梁控制截面的应变、挠度和裂缝开展情况.某公跨铁立交桥位于湖南,为了检测该桥的承载能力及安全性,对该桥进行了静载试验.荷载试验是检测桥梁整体受力性能是否满足设计和标准规范要求,评定桥梁承载能力及安全性最直接和最有效的办法.     

大跨径预应力混凝土连续梁桥的检测评估

大跨径预应力混凝土连续梁桥作为高速公路常见桥型应用广泛.通过对某大跨径连续梁桥的成桥检测过程介绍和检测结果分析,了解该桥的实际工作状况,阐述了该桥的实际承载能力、结构刚度是否满足设计要求,为桥竣工验收做出科学客观的评价.此外,也为该桥正常运营养护提供技术依据,为此类桥梁的设计理论、施工技术总结积累经验.     

扩建九江大桥的平面控制网布测方法

扩建的九江大桥位于原佛开高速九江大桥及325国道九江大桥两桥中间,施工空间小,视野不开阔,对平面控制网的布置及满足控制网的精度要求带来一定的困难.该桥的平面控制网采用测边网布设控制点,较好的达到了控制网的布设要求,对特大型扩建桥的平面控制网布设具有一定的借鉴作用,也对某些地形地势复杂的桥梁的平面控制测量有较好的指导意义.     

基于桥梁施工网精度的研究和探讨

在桥梁工程施工中，要使桥址地区在勘测阶段的控制测量从精度、点的密度和保存等方面满足施工的要求，必须建立桥梁施工控制网，其作用是用于桥墩放样和主梁架设。     

基于桥梁施工网精度的研究和探讨

在桥梁工程施工中，要使桥址地区在勘测阶段的控制测量从精度、点的密度和保存等方面满足施工的要求，必须建立桥梁施工控制网，其作用是用于桥墩放样和主梁架设。     

大型箱形拱桥的静载试验研究

桥梁静载试验是检验桥梁性能及工作状态最直接、最有效的方法。通过对四川南部某特大拱桥的静载试验,获得了该桥的结构现状及整体受力性能情况,检测结果显示该桥桥跨结构不满足汽车-10荷载等级使用要求。试验数据及分析结果为该桥的营运使用,及以后对该桥的综合评估、修复、加固或重建提供了技术依据。     

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.