Hoek-Brown岩体强度估算新方法及其工程应用

如何利用现场调查和室内试验来估算工程岩体强度参数一直是众多工程技术人员要解决的难点问题，而Hoek-Brown强度准则为此提供了一条良好的途径。文中详细介绍了Hoek-Brown强度准则的由来、发展反目前的发展现状和应用状况，并介绍了最新的Hoek-Brown强度准则和岩体强度估算方法的内容。最后笔者结合国内的一个大型水电工程，详细介绍了其应用和效果。说明该方法完全解决了工程岩体强度参数估算的问题，而且效果电好，有着广泛的应用前景。     

浅谈混凝土试件强度试验检测和评定方法

介绍了混凝土抗压强度和抗折强度试件的制作过程、养生方法，论述了混凝土强度的测定、计算的方法和标准。     

船体强度研究现状及对船舶航行的意义

船舶在设计建造及使用过程中无时无刻不在受力,研究船体结构受力,用来指导船舶的建造及日后的航行使用。本文着重介绍了船体强度（总体强度与局部强度）的研究现状及它对船舶建造和航行的影响,在船舶的建造过程中应该以强度为主导,优化结构设计,使其合理分布受力。在船舶航行的过程中,根据船体自身的强度,调整航行性能,保证安全。     

大型油船的剪切强度校核

阐述双壳体、具有中纵舱壁的大型油船重点实施剪切强度校核的部位和校核的方法以及剪力修正的计算公式.通过选取一艘大型油船剪切强度校核的实例,说明在大型油船装载和卸载中应该注意隔舱装载可能对船体强度造成的损害.为编制大型油船的装卸载工艺提供相应的数据.     

形变硬化指数与强度的关系

从硬化指数的定义出发导出了形变硬化指数ｎ与强度参量之间的关系为ｎ＝Ａ（１－σⅠ－／σⅡ）＋Ｂ，σⅠ和σⅡ为真应力应变曲线上一直线段两端点的应用力，Ａ和Ｂ为常数，它适用于单一ｎ值情况，双ｎ特性，单调加载和循环应力应弯曲线，对均匀变形阶段，又导出了ｎ和屈强比的关系，即ｎ＝１－√σｓ／σｂ，该式没有任何特定常数和经验常数，和测量值相比９０％以上的数据的绝对误差在±０．０３以内，它表示了材料的均匀变形能力     

混凝土强度检测方法的比较分析

混凝土结构的质量控制有众多的措施，其中强度的检测方法尤为重要。文章在对国内外常规检测方法比较分析的基础上，提出了合理化建议。     

混凝土配制强度确定方法研究

假定混凝土总体强度呈正态分布，通过概率统计基本知识和抽样检验理论建立了混凝土施工配制强度与抽样检验方案及混凝土验收强度之间关系的不等式方程组，由此找到了一种确定混凝土配制强度的更合理的方法。     

新规范中有关砼强度的几个问题的探讨

本文阐述了新老砼结构规范中砼“标号”和“强度等级”的区别,并对新规范中的砼强度评定方法进行了详细论述     

卸荷土体的强度特征

从理论及试验两方面研究了卸荷土体抗剪强度的问题，分析了土体卸荷与加荷两种受力状态下的不同强度特征，建议以加卸荷强度路径试验曲线线为依据进行卸荷计算。     

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.