基于多维联系正态云模型的泥石流危险性评价

泥石流危险性评价涉及因素多,且具有随机模糊不确定性.文章基于集对论和云模型,探讨了泥石流危险性的多维联系正态云评价模型,即将传统一维正态云模型拓展至多维云模型,以克服传统云模型面对多指标时评价过程的复杂性,并在构建多维云模型中,应用集对同异反原理确定多维正态云数字特征,避免传统云模型数字特征确定的主观性,并实现统一描述实测指标与评价标准间的确定和不确定关系,使评价更能反映实际数据的分布特征.实例应用表明,多维联系正态云模型应用于泥石流危险性评价是有效可行的,较一维云模型和其他方法计算思路更清晰,且结果更加可靠.     

基于非对称联系云的软土沉降等级评价模型

软土沉降等级评价受诸多边界模糊的、有限区间分布的不确定因素影响。文章基于集对论和云理论,提出一种能考虑指标区间边界模糊和非对称特点的土体沉降等级联系云评价新模型,即首先构建基于集对同异反分析的非对称联系云模型,以非对称定量统一描述软土沉降等级评价指标的模糊性及在分类间的转换态势,并结合指标权重综合分析样本与沉降等级间的确定度,以确定土体沉降等级。实例应用结果与现场观测结论及可拓评价结果的对比分析表明,该模型应用于软土沉降等级划分是有效可行的,且克服了传统云模型局限于指标为正态分布的缺陷。     

采空区危险性评价的综合方法及工程应用

针对采空区危险性评价的各因素复杂性和不相容性特点,提出通过物元分析与数值模拟相结合的方式对采空区危险性进行综合评价。选取岩体结构、地质构造、岩石抗压强度、水文因素、工程布置、矿体倾角、高垮比、实际采空区体积、埋藏深度、采空区面积、暴露时间、采动扰动情况、相邻采空区情况13个影响因子,引入物元分析理论,构建采空区危险性评价的物元分析模型。以湖南衡阳老鸦巢矿19个采空区为例,首先应用物元可拓方法,构造物元矩阵,根据计算出的关联度对采空区危险性的等级进行可拓识别,进而借鉴数值模拟的方法验证其正确性,定量、可视化研究危险性高的采空区。研究结果表明:数值模拟结果与物元分析结果一致,亦与实际结果相吻合,证明该综合评价方法用于采空区危险性评价是客观的、合理的。     

可拓综合评价城市公共交通服务质量

城市公共交通系统是城市各子系统中最复杂的系统之一,应用可拓学理论构造基于可拓综合评价方法的评价模型.从可用性、便捷性、感知度三个方面构建评价指标体系,将定性指标转化为定量指标,从而较准确地反映公交服务质量.最后举例表明可拓学理论方法能较真实地反映城市公共交通的服务情况.     

基于可拓理论的管道河沟道水毁危险性评价

随着长输管道建设迅速发展,其沿线普遍发育的河沟道水毁危险性评价成为研究的热点。依据物元理论和可拓集合理论,构建河沟道水毁危险性评价物元模型。在区域地质环境与河沟道水毁基本特征调查研究的基础上,选取14个具代表性的、可量化的评价指标,引入灰色关联度法求其权系数,采用可拓关联函数确定待评物元与危险性分级之间的关联度和隶属度。通过实际应用和对比分析,证明基于灰色关联度的可拓法用于长输管道河沟道水毁危险性评价具有较高的可信度和良好的实用性。     

基于AHP-灰色聚类模型的采空区危险性分析研究

应用灰色系统理论的原理提出了采空区危险性分析的综合评价方法.从具体工程地质出发,分析了影响采空区危险性的诸多因素.通过层次分析法确定各指标的灰色聚类权值,根据实测数据确定了白化权函数,建立了灰色聚类综合评判模型,给出了灰色聚类系数和采空区危险性级别的对应关系,最终得出评价结果.应用该模型对贡北金矿10个采空区的危险性进行分析评价.研究结果表明:该方法与模糊综合评判具有高度的一致性,可以在工程实践中予以推广应用.     

多级可拓评价方法在网络安全评价中的应用

为更全面地对网络系统进行评估, 构建了由5个一级指标和18个二级指标组成的网络安全评价指标体系, 提出了一种基于多级可拓评价原理的网络安全评价模型与方法。实验分析表明, 所建模型与方法具有科学性和合理性, 理论评价结果与实际运行情况相符, 能较准确地反映网络的安全状况。     

基于熵权未确知理论的采空区自燃危险性评价

针对采空区自燃危险性评价难以定量分析的现实,根据煤炭自燃发火机理,建立以煤的自燃倾向性、持续漏风供氧条件和聚热散热条件为一级指标的采空区自燃火灾危险性评价指标体系。基于信息熵和未确知测度理论,构建评价模型,并进行定性、定量分析。应用实例表明,该模型可正确评价采空区自燃发火的危险性。该研究为煤矿有效控制煤炭自燃、降低火灾危险提供了参考。     

公路隧道群运营安全性综合评价方法

在分析公路隧道群运营安全性综合评价特点和评价方法需求的基础上,提出基于集成云模型和物元分析理论的公路隧道群运营安全性综合评价方法,既能通过物元模型建立起评价对象与评价指标的对应关系,实现评价系统的信息反馈,又能通过云模型建立起概念数值表示与自然语言值描述之间的不确定性转换关系,从而实现语言值评价指标的不确定评估。最后,以西安—汉中高速公路隧道群区段为例进行工程实践应用分析。结果表明：该评价方法原理简单,可以对评价指标体系进行可拓变换,易于计算机编程研发公路隧道群运营安全性综合评价系统软件的工程推广应用。     

可拓学理论在住宅建筑综合性能评价中的应用

将可拓理论与住宅建筑综合性能评价相结合，以物元理论和可拓数学作为其理论框架，把住宅建筑综合性能评价看成一个复杂的、相互联系的物元网，并在物元理论、可拓集合论和关联函数运算的基础上，以一套实际住宅为例，建立了住宅建筑综合性能评价的物元模型，利用此模型对住宅建筑综合性能作出了客观评价，结果表明该方法是可行的，且效果理想，是一种既可行又容易被人们接受的评价方法。     

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.