PROGRAM FOR PROCESSING OF HISTORICAL LABORATORY DATA BASED ON FUZZY SET THEORY AS A TOOL FOR DECISION SUPPORT     

J.KLAESSENS  J.VANSCHALKWIJK  P.COX  R.BEZEMER  B.VANDEGINSTE  G.KATEMAN 《地理学报(英文版)》1988,(1)

A computer program(FEA)is presented for processing historical laboratory data.It performs on a list ofsample entries stored in a laboratory information management system.Using an algorithm which is basedon fuzzy set theory,FEA classifies the entries into a limited number of clusters called sample types.Theclassification is fully user-defined.The program transforms the historical data into a representation whichis more suitable for studying the performance of the laboratory or which can be used as preparation for asimulation project.  相似文献   

Knowledge-Driven and Data-Driven Fuzzy Models for Predictive Mineral Potential Mapping   总被引：5，自引：0，他引：5  

Porwal  Alok  Carranza  E. J. M.  Hale  M. 《Natural Resources Research》2003,12(1):1-25

In this paper, we describe new fuzzy models for predictive mineral potential mapping: (1) a knowledge-driven fuzzy model that uses a logistic membership function for deriving fuzzy membership values of input evidential maps and (2) a data-driven model, which uses a piecewise linear function based on quantified spatial associations between a set of evidential evidence features and a set of known mineral deposits for deriving fuzzy membership values of input evidential maps. We also describe a graphical defuzzification procedure for the interpretation of output fuzzy favorability maps. The models are demonstrated for mapping base metal deposit potential in an area in the south-central part of the Aravalli metallogenic province in the state of Rajasthan, western India. The data-driven and knowledge-driven models described in this paper predict potentially mineralized zones, which occupy less than 10% of the study area and contain at least 83% of the model and validation base metal deposits. A cross-validation of the favorability map derived from using one of the models with the favorability map derived from using the other model indicates a remarkable similarity in their results. Both models therefore are useful for predicting favorable zones to guide further exploration work.  相似文献   

Transient analysis of wave propagation in non‐homogeneous elastic unbounded domains by using the scaled boundary finite‐element method     

Mohammad Hossein Bazyar  Chongmin Song 《地震工程与结构动力学》2006,35(14):1787-1806

The scaled boundary finite‐element method has been developed for the dynamic analysis of unbounded domains. In this method only the boundary is discretized resulting in a reduction of the spatial dimension by one. Like the finite‐element method no fundamental solution is required. This paper extends the scaled boundary finite‐element method to simulate the transient response of non‐homogeneous unbounded domains with the elasticity modulus and mass density varying as power functions of spatial coordinates. To reduce the number of degrees of freedom and the computational cost, the technique of reduced set of base functions is applied. The scaled boundary finite‐element equation for an unbounded domain is reformulated in generalized coordinates. The resulting acceleration unit‐impulse response matrix is obtained and assembled with the equation of motion of standard finite elements. Numerical examples of non‐homogeneous isotropic and transversely isotropic unbounded domains demonstrate the accuracy of the scaled boundary finite‐element method. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

大庆油田葡萄花油层组储层非均质性   总被引：4，自引：0，他引：4  

单敬福  纪友亮  张海玲  黄金鼎  安爱琴 《华北地质》2006,29(2):136-144

笔者根据大庆油田测井资料二次解释的孔隙度(φ)、泥质含量(Vsh)、粒度中值(Md)、束缚水饱和度(Swi)等资料,借助BP网络对渗透率进行预测,对该油田中部葡萄花油层组的非均质性进行了定量—半定量研究,认为大庆油田中部葡萄花油层组PI2小层层内非均质性最严重,与沉积微相密切相关;单砂层垂向上渗透率的变化以正韵律和复合式韵律为主,局部发育反韵律模式。经对葡萄花油层组PI1PI4系统研究(PI表示葡萄花油层组一段;PI1为次一级分层,以下名称类推),层内非均质性强弱依次为PI2a、PI3、PI2b、PI1、PI4;层间非均质性在PI3和PI4间表现得最强,其它相对要弱;各小层平面非均质性相差无几,整体表现为较强的非均质性。  相似文献   

应用逼近理想解法综合评价区域水资源承载能力   总被引：3，自引：0，他引：3  

崔振才  曹广占  刘秋生  靳兆荣  高振芬 《水文》2006,26(5):7-10

在多目标决策中,基于传统的逼近于理想解的技术,根据区域水资源承载能力的强与弱和待评价的对象(评价方案)的不理想(负理想)与理想(劣与优)这些典型的模糊概念,提出了基于模糊集合的逼近理想解法(TOPSISFS),并应用于区域水资源承载能力的综合评价中。TOPSISFS与投影寻踪模型法(PP法)、理想区间法(MODMIIM)相比,简单、有效。TOPSISFS可广泛应用于多目标决策中。  相似文献   

粗糙神经网络在森林火灾预警中的应用     

余亮  边馥苓 《武汉大学学报(信息科学版)》2006,31(8):720-723

利用神经网络和粗糙集处理不确定性问题的优势，提出一种粗糙集结合神经网络进行森林火灾预测模型。通过与传统预测模型相比较，证明了该方法的有效性。  相似文献   

The formation evaluation tool and its application in offshore China     

Liu Jianxin Zhang Conghui Pang Xishun 《应用地球物理》2006,3(1):62-67

The Formation Evaluation Tool （FET） introduced in the paper represents a new generation of formation evaluation systems developed and manufactured by China Oilfield Services Limited （COSL）, CNOOC, using a FET technology transfer from Crocker Research, Australia. The system has been applied successfully in the Bohai Sea and South China Sea. For instance, a multilayered oil and water system has been confirmed with the aid of accurate formation pressure tests, even in very thin beds and edge water reservoirs, overcoming the difficulty of determining this kind of oil-water and gas-water contacts. Moreover, the FET pumping and real-time fluid monitoring function allows acquiring a true sample of formation fluid unpolluted by drilling mud which plays an important role in determining the fluid properties of the target stratum and analyzing the fluid component. The principles and purpose of the Formation Evaluation Tool （FET） will be briefly introduced and successful examples of the application of the technology will be described in detail in this paper.  相似文献   

拟建深基坑降水试验岩土工程分析     

吴权  费廷玉 《上海国土资源》2006,(1):37-40

通过对上海轨道交通9号线宜山路车站深基坑降水试验结果分析,得到不同土层受降水影响的岩土工程特征,并对个别土层的实测沉降与由室内试验参数进行估算的沉降进行比较,以获得真实的沉降影响状况,指导深基坑的设计和施工。  相似文献   

集对分析在西安市地下水污染动态评价的应用   总被引：2，自引：2，他引：2  

冯煜  孙根年 《地下水》2006,28(3):50-53

选取总固体、总硬度、硝酸盐、氯化物、氟化物、六价铬等六种主要污染物,利用集对分析的方法,将超标率、污染指数和超标面积指数综合起来,对 1985-2003 年西安建成区地下水进行了动态评价.该方法既克服了依靠某年监测值对地下水质的静态空间评价,又可将超标率、污染指数和超标面积综合起来,完成地下水水质的动态评价.  相似文献   

苏锡常地区地下水禁采后的地质环境效应研究     

胡建平  隋兆显  陈杰 《江苏地质》2006,30(4):261-264

1995年以来,针对严重的区域性地面沉降和地裂缝灾害,苏锡常地区地下水资源保护和管理工作逐渐加强,特别是从2000年开始,江苏省政府分阶段实施限期禁止开采工作,首先在超采区实行地下水禁采,到2005年底,在苏锡常地区全面禁止开采地下水,全区地下水环境、地面沉降状况出现明显好转,地下水水位普遍回升,地面沉降速率逐渐减缓。根据近年来苏锡常地区地面沉降基岩标、分层标的系统监测资料,对地下水禁采后地质环境的效应特别是地面沉降的变化特征进行了初步分析、研究,并对该区今后地质环境保护工作提出了对策和建议。  相似文献