基于云模型的城市深基坑工程施工风险评价

为解决城市深基坑工程施工风险评价指标模糊性、随机性造成风险等级难以确定的困难,提出基于云模型的城市深基坑工程施工风险评价方法.从土方开挖、地基处理、基坑支护、排水降水和基坑监测五方面建立了城市深基坑工程施工风险评价指标体系;结合网络层次分析法(Analytic Network Process)和改进CRITIC法确定了...     

地铁深基坑施工风险耦合评价方法

研究一套适用于地铁深基坑施工风险评价的指标体系和方法,用以分析评判项目施工风险等级,指导和改进现场施工风险管理.首先,依据事故树分析(FTA)、“4M1E”系统安全理论和文献分析等,构建包含29个指标的地铁深基坑施工风险评价指标体系;然后,结合风险耦合理论分析风险因素间的交互作用,建立基于C-OWA算子和相互作用矩阵法的施工风险评价模型.结合某地铁深基坑施工项目案例,应用该评价指标体系和方法计算施工风险等级为中等风险,此结果与项目实际施工情况相符,从而验证了本文方法的可行性.     

基于WBS和RBS的项目动态风险分析

以项目风险分析理论为基础,结合建筑企业自身的特点,研究了基于工作分解结构和风险分解结构进行风险识别的基础上,运用系统工程思想和方法,对大型工程项目动态风险管理进行了探讨。     

深基坑工程风险识别与模糊综合评价

文章针对深基坑工程施工影响因素的随机性与模糊性特点,提出了风险评估的模糊综合评价法.采用分解分析法对风险进行识别,建立风险清单并运用层次分析法合理地确定影响因素的权重,并在此基础上对风险进行模糊评价,根据最大隶属度原则确定深基坑工程施工期的总体风险等级,为工程的风险应对提供依据.     

不完全信息下制造企业低碳生产行为表现评价方法

针对制造企业低碳生产行为表现评价中面临信息不完全、不精确等情况,提出一种不完全信息下基于证据理论与向量相似度的低碳生产行为表现排序方法.在构建制造企业低碳生产行为表现评价指标体系基础上,以评价等级为识别框架,运用证据理论分析算法对评价信息进行融合,并将分析结果转化为区间数,通过构造向量相似度方法对区间数进行排序,得到评价结果.最后通过算例说明了该方法的可行性,以及不完全信息处理的有效性.     

基于肯特指数法的深基坑施工安全风险评价

为定量分析基坑施工过程的安全风险,统计了我国近年来深基坑施工典型事故,分析深基坑事故发生的规律和特点,对基坑施工事故原因做出初步的分析和总结,引用并改进在管道风险评价中适用范围较广的肯特指数法,建立适用于深基坑工程的风险评价模型,在此基础上创建深基坑施工安全风险评价指标体系。将该评价体系运用于合江套湘江隧道始发井深基坑施工安全风险评价中,结果表明该工程施工总体风险处于可接受水平,验证了该评价方法的可行性。     

石油工程技术服务企业海外项目风险不确定评价模型

构建了包含市场风险、经济风险、政治风险、技术风险、自然风险、管理风险6个准则21项指标的风险评价指标体系,采用层次分析法确定指标权重,构建了石油工程技术服务企业海外项目风险区间数不确定评价模型.实例表明,该方法科学有效、简便可行,为石油工程技术服务企业海外项目风险评价提供了新的方法与思路.     

用于供应商风险评价的FMEA改进

提出一种基于犹豫模糊集和灰色关联理论的改进失效模式与后果分析(FMEA)方法用于供应商风险评价.首先对供应商潜在风险进行识别并由专家小组根据偏好使用语义术语对各种风险做出评价,然后采用犹豫模糊集和语义计算的方法处理评价信息,运用粗糙集思想将处理后的信息转化为区间数形式,最后综合考虑各变量的相对重要程度并结合灰色关联理论决定风险排序.以某制造企业的供应商风险评价问题为例,表明所提方法有助于企业识别出合作供应商的主要风险,可以为企业制定风险管控策略提供支持.     

公共部门社会风险防范能力评估指标体系构建

公共部门是国家现代化建设的基本组织,是当前社会风险防范的重要力量;强化对公共部门社会风险防范能力的评估,可以为其发展提供更高参考标准,同时也能促进公共部门高效履职。运用德尔菲法与AHP层次分析法,结合"结构-过程-结果"(SPO)三维评价模型,力图构建科学合理的公共部门社会风险防范能力评估指标体系。该体系一级指标为公共部门所必须具备的"结构、过程与结果"三个导向指标,二级指标分别为"结构分项的三个指标、过程分项的六个指标与结果分项的两个指标",并在此基础上进一步展开三级指标。评估指标体系的构建是为提升公共部门风险防范能力提供行动指南。     

基于修正证据理论的高耸结构翻模施工安全风险评估

高耸结构翻模施工安全风险评估是一项复杂的多属性决策工作,主要通过收集专家的定性描述来确定其指标权重做出风险评估。为了更好的把专家的定性描述转化为更为客观的定量化评估,本文提出了一种基于结构熵权法和修正证据理论的高耸结构翻模施工安全风险评估方案。该方案结合高耸结构翻模施工特点,以模板安设、钢筋安设、混凝土浇筑、模板提升、模板拆除等五个方面构建评价指标体系,采用结构熵权法确定各指标的权重,同时运用贝叶斯近似法修正的证据理论对指标体系进行多层递阶评价,得到了风险评价结果。实证分析表明,该评价方法能有效的反映出施工安全风险等级,对高耸结构翻模施工安全风险评价是可靠的,为类似工程的评价提供了新思路。     

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.