土地利用更新调查监理工作方法   总被引：2，自引：0，他引：2  

潘建祖  陆玉祥 《现代测绘》2005,28(6):37-39

大型测绘项目引入监理机制,是近年来推行的一种测绘项目管理方法,是加强测绘行业监督管理的有效手段,将成为测绘工程中不可或缺的工作.在土地利用更新调查方面的监理工作亦是一项刚刚开展的工作.  相似文献   

Decoupling Conditions for Elasto-plastic Consolidation Question Based on Numerical Modeling Method   总被引：1，自引：0，他引：1  

Cheng Tao Wang Jingtao Dong Bichang 《中国地质大学学报(英文版)》2005,16(4):363-368

INTRODUCTION Theconsolidationofsaturatedsoilisanimpor tantsubjectingeomechanics.Biot(1941)proposed thethree dimensionalconsolidationtheory,whichis basedontheprincipleofeffectivestress,continuity conditionsandequilibriumequations.Theremarka blesuccessofthistheoryistheanalysisofthetime dependenteffectandcouplingeffectofsoilandpore water.Thus,thetheoryisaclassictheoryinsatu ratedsoilstatistics.Itwasalmostunfeasibletoperformanalysesof thistheorywithoutthedevelopmentofhigh speed computersandnu…  相似文献   

Reservoir Characterization of McMurray Formation by 2D Geostatistical Modeling     

Weishan Ren  Jason A. Mclennan  Oy Leuangthong  Clayton V. Deutsch 《Natural Resources Research》2006,15(2):111-117

There is a need to estimate reserve uncertainty for large lease areas. Detailed 3D models of heterogeneity are not necessarily required, but there is a need to integrate all available data into an in-situ reserve estimate with uncertainty. A 2D mapping approach is presented to appraise reserves accounting for multiple variables, multiple data sources, and uncertainty. The approach can be considered in three primary steps: (1) Bayesian updating is used to determine local distributions of uncertainty for each primary variable while integrating multiple secondary information, (2) matrix simulation is employed to jointly and simultaneously simulate multiple collocated variables to determine a derived variable such as OOIP, and (3) probability field simulation then is applied to permit joint simulation of multiple locations. This methodology permits local and global uncertainty assessment while integrating multiple sources of information. An application to the McMurray Formation in Alberta, Canada is demonstrated.  相似文献   

Direct estimation of the seismic demand and capacity of oscillators with multi‐linear static pushovers through IDA     

Dimitrios Vamvatsikos  C. Allin Cornell 《地震工程与结构动力学》2006,35(9):1097-1117

SPO2IDA is introduced, a software tool that is capable of recreating the seismic behaviour of oscillators with complex quadrilinear backbones. It provides a direct connection between the static pushover (SPO) curve and the results of incremental dynamic analysis (IDA), a computer‐intensive procedure that offers thorough demand and capacity prediction capability by using a series of nonlinear dynamic analyses under a suitably scaled suite of ground motion records. To achieve this, the seismic behaviour of numerous single‐degree‐of‐freedom (SDOF) systems is investigated through IDA. The oscillators have a wide range of periods and feature pinching hysteresis with backbones ranging from simple bilinear to complex quadrilinear with an elastic, a hardening and a negative‐stiffness segment plus a final residual plateau that terminates with a drop to zero strength. An efficient method is introduced to treat the backbone shape by summarizing the analysis results into the 16, 50 and 84% fractile IDA curves, reducing them to a few shape parameters and finding simpler backbones that reproduce the IDA curves of complex ones. Thus, vast economies are realized while important intuition is gained on the role of the backbone shape to the seismic performance. The final product is SPO2IDA, an accurate, spreadsheet‐level tool for performance‐based earthquake engineering that can rapidly estimate demands and limit‐state capacities, strength reduction R‐factors and inelastic displacement ratios for any SDOF system with such a quadrilinear SPO curve. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

Updating and computing the geoid using two dimensional fast Hartley transform and fast T transform     

M. E. Ayhan 《Journal of Geodesy》1997,71(6):362-369

In the analyses of 2D real arrays, fast Hartley (FHT), fast T (FTT) and real-valued fast Fourier transforms are generally preferred in lieu of a complex fast Fourier transform due to the advantages of the former with respect to disk storage and computation time. Although the FHT and the FTT in one dimension are identical, they are different in two or more dimensions. Therefore, first, definitions and some properties of both transforms and the related 2D FHT and FTT algorithms are stated. After reviewing the 2D FHT and FTT solutions of Stokes' formula in planar approximation, 2D FHT and FTT methods are developed for geoid updating to incorporate additional gravity anomalies. The methods are applied for a test area which includes a 64×64 grid of 3^′×3^′ point gravity anomalies and geoid heights calculated from point masses. The geoids computed by 2D FHT and FTT are found to be identical. However, the RMS value of the differences between the computed and test geoid is ±15 mm. The numerical simulations indicate that the new methods of geoid updating are practical and accurate with considerable savings on storage requirements. Received: 15 February 1996; Accepted: 22 January 1997  相似文献   

3S技术在数据库数据更新中的应用     

付治河  王品  房玉华 《测绘与空间地理信息》2005,28(3):88-89

主要介绍了“3S”技术及其在数据库数据更新方面发展的状况，并以1：250000数据库更新为例，简述了利用“3S”技术进行数据库数据更新的基本过程及步骤。  相似文献   

1：25万地图数据库更新中遥感影像的处理方法     

李少梅  孙群等 《测绘信息与工程》2003,28(2):20-21

卫星遥感影像已成为快速补充与更新地理信息的主要方法，以对1：25万地图数据库的更新为例，研究遥感影像选择预处理与变换定位的方法。  相似文献   

An Incremental Response Spectrum Analysis Procedure Based on Inelastic Spectral Displacements for Multi-Mode Seismic Performance Evaluation   总被引：1，自引：0，他引：1  

M. Nuray Aydinoğlu 《Bulletin of Earthquake Engineering》2003,1(1):3-36

The so-called Nonlinear Static Procedure (NSP) based on pushover analysis has been developed in the last decade as a practical engineering tool to estimate the inelastic response quantities in the framework of performance-based seismic evaluation of structures. However NSP suffers from a major drawback in that it is restricted with a single-mode response and therefore the procedure can be reliably applied only to the two-dimensional response of low-rise, regular buildings. Recognizing the continuously intensifying use of the pushover-based NSP in the engineering practice, the present paper attempts to develop a new pushover analysis procedure to cater for the multi-mode response in a practical and theoretically consistent manner. The proposed Incremental Response Spectrum Analysis (IRSA) procedure is based on the approximate development of the so-called modal capacity diagrams, which are defined as the backbone curves of the modal hysteresis loops. Modal capacity diagrams are used for the estimation of instantaneous modal inelastic spectral displacements in a piecewise linear process called pushover-history analysis. It is illustrated through an example analysis that the proposed IRSA procedure can estimate with a reasonable accuracy the peak inelastic response quantities of interest, such as story drift ratios and plastic hinge rotations as well as the story shears and overturning moments. A practical version of the procedure is also developed which is based on the code-specified smooth response spectrum and the well-known equal displacement rule. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Identification of parametric ground motion random fields from spatially recorded seismic data     

A. Zerva  J. L. Beck 《地震工程与结构动力学》2003,32(5):771-791

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独立分量分析及其在地震信息处理中应用初探   总被引：16，自引：6，他引：16  

刘喜武  刘洪  李幼铭 《地球物理学进展》2003,18(1):90-96

独立分量分析(ICA)是最近才发展起来的一种统计学方法，旨在寻求对非高斯分布数据进行有效表示，使得各个分量在统计学上独立，或者尽最大可能地独立。许多应用中，这种表示意在获取数据的基本结构，包括特征提取和信号分离。本文给出ICA的基本理论和快速算法，并对FastICA稍作改进，在分析地震信号特点的基础上，对其在地震信息处理中应用进行初步探索，表明ICA在地震信号处理中具有应用前景。  相似文献