一种消除stokes积分卷积化近似误差影响的有效方法

在应用快速Hartly变换(FHT)或快速Fourier变换(FFT)计算Stokes积分公式时,总是先将Stokes 公式化成卷积形式,然后用 FHT或 FFT完成卷积运算,从而避免了复杂费时的积分计算。但由于 Stokes公式不严格满足卷积定义,欲将其化成卷积形式必须作一些近似。这种近似虽能在一定精度范围满足要求,但对于高精度要求仍有不能允许的计算误差。本文建议采用球面坐标转换方法,能有效地消除无论是用 FHT或 FFT 计算Stokes 积分卷积化所带来的误差影响。     

The representation of geoscience information for data integration

In mineral exploration, resource assessment, or natural hazard assessment, many layers of geoscience maps such as lithology, structure, geophysics, geochemistry, hydrology, slope stability, mineral deposits, and preprocessed remotely sensed data can be used as evidence to delineate potential areas for further investigation. Today's PC-based data base management systems, statistical packages, spreadsheets, image processing systems, and geographical information systems provide almost unlimited capabilities of manipulating data. Generally such manipulations make a strategic separation of spatial and nonspatial attributes, which are conveniently linked in relational data bases. The first step in integration procedures usually consists of studying the individual charateristics of map features and interrelationships, and then representing them in numerical form (statistics) for finding the areas of high potential (or impact).Data representation is a transformation of our experience of the real world into a computational domain. As such, it must comply with models and rules to provide us with useful information. Quantitative representation of spatially distributed map patterns or phenomena plays a pivotal role in integration because it also determines the types of combination rules applied to them.Three representation methods—probability measures, Dempster-Shafer belief functions, and membership functions in fuzzy sets—and their corresponding estimation procedures are presented here with analyses of the implications and of the assumptions that are required in each approach to thematic mapping. Difficulties associated with the construction of probability measures, belief functions, and membership functions are also discussed; alternative procedures to overcome these difficulties are proposed. These proposed techniques are illustrated by using a simple, artificially constructed data set.     

体现主客观信息的土地定级因素综合集成赋权法研究

应用云模型、特尔斐法、关联分析法研究了土地定级中各影响因素的合理赋权问题，提出了体现主客观信息的土地定级因素综合集成赋权方法，并依据武汉市土地定级指标体系和有关数据，对武汉市土地定级影响因素进行了权重挖掘。     

浅谈中国石油天然气集团公司(CNODC)海外数字油田与勘探开发一体化集成系统的建设

本文就中国石油天然气集团公司CNPC海外业务成功运作实践，指出数字油田技术可望成为中石油在国际市场竞争中的利器.随着海外业务的快速发展，作业的国家及相关项目迅速增加，随之而来的项目管理、经营调度、生产监控等公司日常管理工作日趋复杂，相关信息往来越来越多、传递速度越来越快.与此同时，信息技术的迅猛发展，为实现企业的海量信息处理需求提供了可能，而连接海内外的数字油田建设正是提高公司核心竞争力的重要载体和手段.论述了CNODC海内外项目的信息化现状及存在问题，指出勘探开发一体化集成系统建设作为核心技术是海外数字油田的重中之重，呼吁尽快提出适合自己的高效、规避风险的与海外项目紧密连接的“海外数字油田”战略.     

Mahsuri’s curse—globalisation and tourist development in Pulau Langkawi

The legend of Mahsuri abounds in Malaysian school textbooks. Mahsuri was a beautiful and very charming village maiden who lived in Pulau Langkawi and was wrongfully put to death in 1819 or the year 1235 hijrab. Accused of adultery by a jealous member of the royal house, Mahsuri, who was married to the Chief Minister, was sentenced to death together with her alleged lover, a trader from a place which is now part of Thailand in Phuket. Killed with her own family’s keris (a traditional Malay sword), Mahsuri put a curse on Pulau Langkawi for seven generations. She swore before her death that there would be no peace or prosperity on the island for the duration of these seven generations. Mahsuri’s family moved to another village in what was then the territory of Thailand and finally settled in Phuket, illustrating the cultural and trading links that have existed in this northern part of Malaysia between the southern parts of Thailand and the states of Perlis and Kedah. Mahsuri’s family and she appear to have not been allowed to rest in peace since her premature death. Her tomb, which was enshrined by the villagers, has been relocated several times and the exact location of its whereabouts may not be known. The tombstone itself is now housed in a museum that has been constructed near to the site where the tomb is believed to be. A huge tourist complex called Kota Mahsuri is being developed around the site of Mahsuri’s tomb. Pulau Langkawi may be the island paradise lost. Perhaps Mahsuri’s curse lingers, no matter that seven generations have passed and with them the industries that integration with the global economy has seen developed, declined and disappeared. Then again, perhaps this is indeed the curse—the quest for prosperity in a globalizing world and its relentless exploitation of the heritage in strategic parts of Malaysia—both natural and cultural—for the gains of a few and questionable benefits to the rest.     

Simultaneous Integration of Pressure, Water Cut,1 and 4-D Seismic Data In Geostatistical Reservoir Modeling

A geostatistically-based inverse technique, the sequential-self calibration (SSC) method, is used to update reservoir models so that they match observed pressure, water cut and time-lapse water saturation derived from 4-D seismic. Within the SSC, a steady-state genetic algorithm (GA) is applied to search the optimal master point locations, as well as the associated optimal permeability perturbations at the master locations. GA provides significant flexibility for SSC to parameterize master point locations, as well as to integrate different types of dynamic data because it does not require sensitivity coefficients. We show that the coupled SSC/GA method is very robust. Integrating dynamic data can significantly improve the characterization of reservoir heterogeneity with reduced uncertainty. Particularly, it can efficiently identify important large-scale spatial variation patterns (e.g., well connectivity, near well averages, high flow channels and low flow barriers) embedded in the reservoir heterogeneity. Using dynamic data, however, could be difficult to reproduce the permeability values on the cell-by-cell basis for the entire model. This reveals the important evidence that dynamic data carry information about large-scale spatial variation features, while they may be not sufficient to resolve the individual local values for the entire model. Through multiple realization analysis, the large-scale spatial features carried by the dynamic data can be extracted and represented by the ensemble mean model. Furthermore, the region informed by the dynamic data can be identified as the area with significant reduced variances in the ensemble variance model. Within this region, the cell-by-cell correlation between the true and updated permeability values can be significantly improved by integrating the dynamic data.     

基于本体(Ontology)的空间信息互操作与集成方法研究

随着Semantic Web技术的发展,基于Ontology的空间信息服务是分布式网络环境下异构空间信息资源共享与互操作实现的可行途径.在对空间信息共享与互操作发展历程、Ontology的基本理论及国内外基于Ontology的空间信息共享与互操作研究现状进行系统全面总结概括的基础上,提出了Ontology驱动的空间信息共享与互操作系统的体系框架、服务流程,并提出了今后研究的重点.基于该服务框架构建的信息系统能将分散在Internet上的各种空间资源信息动态地集成在一起,实现分布式环境下异构空间信息资源的共享与互操作.     

城乡一体化过程中农民满意度调查研究

推进城乡一体化的最终目的就是要达到城乡共荣，其中农民问题解决与否成为城乡一体化成败的关键。成都市几个城乡一体化试点城镇的农民对现今政策、生活等方面满意程度如何，也是一个备受关注的问题。通过实地调查，采用模糊数学方法，对成都市的几个城乡一体化试点城镇的农民目前的状况进行综合评价，计算出他们的满意程度，找出存在的问题，为今后城乡一体化的普遍开展提供参考。经过对调查数据的处理计算，结果表明：成都市城乡一体化试点城镇的农民的满意程度处于满意和一般满意状况。     

A novel predictor–corrector algorithm for sub‐structure pseudo‐dynamic testing

A new predictor–corrector (P–C) method for multi‐site sub‐structure pseudo‐dynamic (PSD) test is proposed. This method is a mixed time integration method in which computational components separable from experimental components are solved by implicit time integration method (Newmark β method). The experiments are performed quasi‐statically based on explicit prediction of displacement. The proposed P–C method has an important advantage as it does not require the determination of the initial stiffness values of experimental components and is thus suitable for representing elastic and inelastic systems. A parameter relating to quality of displacement prediction at boundaries nodes is introduced. This parameter is determined such that P–C method can be applicable to many practical problems. Error‐propagation characteristics of P–C method are also presented. A series of examples including linear and non‐linear soil–foundation–structure interaction problem demonstrate the performance of the proposed method. Copyright © 2005 John Wiley & Sons, Ltd.     

GIS空间数据的分析与制图一体化策略

地理信息系统(GIS)是地理学、地图学等在信息化时代发展的新的理论技术体系,其软件系统需要同时具有地理空间分析与地图表达两方面的功能。但是分析与制图对地理空间数据的要求存在一定程度的差异,导致两者间数据无法充分共享。在分析地理空间数据冲突的基础上,初步探讨了在GIS中实现分析与制图功能一体化的数据采集与应用方案,有助于避免数据的重复建设,提高地理空间数据的利用效率。