基于Symantec Backup Exec实现的湖北国土资源数据中心备份系统   总被引：1，自引：0，他引：1  

李江 《国土资源信息化》2008,(4):6-11

本文深入探讨了有关数据备份中离线数据存储、备份策略规划、ORACLE数据库备份特性等技术专题,同时较详细地介绍了Symantec Backup Exec备份软件的服务组件和工作原理,并基于该软件介绍了如何构建湖北国土资源数据中心备份系统的具体实现过程。  相似文献   

Analytical evaluation of structural component limit state probabilities     

Xavier Romão  João Guedes  Aníbal Costa  Raimundo Delgado 《Bulletin of Earthquake Engineering》2008,6(2):309-333

Probabilistic seismic assessment requires extensive computational effort resulting from variability both in input ground motions and mechanical properties. Nonetheless, such methodologies are of considerable importance, namely for pre-earthquake disaster planning or development of retrofitting programs. A framework for the analytical definition of closed form expressions for exceedance probabilities of structural component limit states, defined by limit values of structural response parameters, is proposed herein. The definition of these expressions is based on the probabilistic representation of the ground motion intensity and on the establishment of suitable expressions characterizing the evolution of structural demand with increasing earthquake intensity. Distinction is made between deformation-based and force-based structural parameters in the definition of such relations. Within the proposed framework, the limit states are defined by single deterministic thresholds of structural response quantities at the component level, as defined in structural codes. Different approaches are also discussed to account for the randomness of the mechanical properties and ground motion input within the proposed methodology. An application of the assessment of different limit state probabilities of members from a reinforced concrete building is presented, for which limit states and limit state capacities are defined according to the upcoming Part 3 of the Eurocode 8. Although the presented application only deals with member chord rotation and shear force limit state probabilities, the proposed methodology can be generalized to other deformation-based and force-based structural parameters.  相似文献   

宁夏太阳辐射特征及太阳能利用潜力综合评价   总被引：20，自引：4，他引：16  

桑建人  刘玉兰  林莉 《中国沙漠》2006,26(1):122-125

分析宁夏1961—2004年的实测资料和计算各站的太阳辐射,结果表明,宁夏太阳辐射和日照时数北部多于南部,且直接辐射多、散射辐射少,太阳能可利用日数多,太阳能装置的利用率较高。利用主成分综合分析,银川的太阳能及其可利用状况在全国排名第3位,固原排名第12位\.由此可见,宁夏的太阳能资源丰富,可开发条件优越,综合利用太阳能的潜力巨大。  相似文献   

基于ASTER数据的遥感蚀变信息提取——以西天山穆龙套地区为例     

茹菲娜·阿力木江  陈川  高玲玲  李顺达 《地球学报》2022,43(2):235-245

西天山是"丝绸之路经济带"和"亚洲金腰带"的核心区和重要组成部分, 世界级的穆龙套金矿床是西天山成矿带内最重要的金矿床之一.作者将前人成果与自身研究结果结合, 形成该篇以穆龙套地区为例的基于ASTER数据的遥感蚀变信息提取的论文.含碳质细碎屑岩是穆龙套地区的溶矿岩层, 矿体受韧性-韧脆性断裂系统的严格控制.穆龙套地区热...  相似文献   

内蒙古达来庙地区1:5万矿调遥感蚀变信息提取     

王弢  刘颖曙  章培春 《西部资源》2011,(6):80-82

本文探讨了内蒙古达来庙矿调工作区乌兰德勒、准苏吉花、阿敏乌苏等钼矿床围岩蚀变的特征及遥感识别方法。通过采用主成分分析、比值以及主成份变换法等多种蚀变异常提取方法,提取了与钼矿化有关的围岩蚀变信息。经野外实地验证,发现了两个具有重要找矿价值的找矿靶区,经进一步勘查矿床规模已达中型。  相似文献   

An adaptive approach for the segmentation and extraction of planar and linear/cylindrical features from laser scanning data     

《ISPRS Journal of Photogrammetry and Remote Sensing》2014

Laser scanning systems have been established as leading tools for the collection of high density three-dimensional data over physical surfaces. The collected point cloud does not provide semantic information about the characteristics of the scanned surfaces. Therefore, different processing techniques have been developed for the extraction of useful information from this data which could be applied for diverse civil, industrial, and military applications. Planar and linear/cylindrical features are among the most important primitive information to be extracted from laser scanning data, especially those collected in urban areas. This paper introduces a new approach for the identification, parameterization, and segmentation of these features from laser scanning data while considering the internal characteristics of the utilized point cloud – i.e., local point density variation and noise level in the dataset. In the first step of this approach, a Principal Component Analysis of the local neighborhood of individual points is implemented to identify the points that belong to planar and linear/cylindrical features and select their appropriate representation model. For the detected planar features, the segmentation attributes are then computed through an adaptive cylinder neighborhood definition. Two clustering approaches are then introduced to segment and extract individual planar features in the reconstructed parameter domain. For the linear/cylindrical features, their directional and positional parameters are utilized as the segmentation attributes. A sequential clustering technique is proposed to isolate the points which belong to individual linear/cylindrical features through directional and positional attribute subspaces. Experimental results from simulated and real datasets demonstrate the feasibility of the proposed approach for the extraction of planar and linear/cylindrical features from laser scanning data.  相似文献   

地震监测设施建设定额编制的原则及方法     

杨文东  孙建中  胡宝慧  邓阳  吕志勇 《华南地震》2013,33(2)

通过对现行国家和行业相关建设定额标准的分析,根据地震行业现行的各种法律法规、建设标准、技术规程和规范,总结了地震监测设施建设的工程特点和各个建设环节,在地震监测建设定额标准体系架构的指导下,提出了编制地震监测设施建设定额的原则和方法.  相似文献   

利用远震P波质点运动检核区域地震计水平分量方位     

周琳  王庆良  崔笃信  郝明  李煜航  季灵运 《地震工程学报》2013,35(2):326-333

地震计三分量方位的准确性对现代地震学研究具有很重要的意义.文献[1]利用P波偏振原理和多地震事件加权叠加方法计算表明,中国“十五”数字地震网络台站中有近三分之一的台站存在地震计水平方位偏差大、极性接反或分量互换等方面的问题.本文选取鄂尔多斯地块周缘地区24个代表性台站,利用2007年8月至2011年3月期间73个M≥7远震事件的P波资料,对台站分量方位等问题进行了检核计算.考虑到期间地震仪的可能重新安装因素,应用单地震事件的反演方位时间序列变化来计算分量方位偏差及其可能的方位校正.研究结果表明,反演的方位与文献[1]的结果基本一致,表明中国“十五”数字地震网络确实存在部分台站方位偏差较大等方面问题.因此,在SKS横波分裂等现代地震学研究中应充分考虑台站地震计方位不准和变动等因素的影响.  相似文献   

Questionable interpretation of the Precautionary Principle in Australia's implementation of ‘no-take’ marine protected areas     

R. Kearney  C.D. BuxtonG. Farebrother 《Marine Policy》2012,36(3):592-597

The introduction of marine protected areas (MPAs) in Australia has resulted in an increase in the number and total area of ‘no-take’ zones. The resulting closures impact all forms of commercial and recreational fishing in and around them despite international recognition indicating that Australian fisheries were already well managed according to ecological sustainable development guidelines. Furthermore, it is recognised within Australia that most MPAs are not designed to provide protection from the full suite of known threats that can affect biodiversity and long-term ecosystem viability. By directing MPA management disproportionately towards comprehensive no-take zones that affect fishing practices that are already required by state and federal legislation to adhere to sustainability requirements, the suite of threats affecting both protected and unprotected areas can be left inadequately and/or inappropriately managed. It is shown in this paper that the modified definition of the Precautionary Principle, which was developed specifically for the MPA process in Australia, is not in keeping with accepted international definitions and guidelines for the use of precaution. It is argued that the development of a definition of precaution to justify a predetermined output (MPAs) devalues the sound use of scientific principles and diminishes the conservation outcome. Furthermore, by distracting efforts from determining and managing the full suite of recognised threats, the value of what protection is provided in Australia's marine protected areas is eroded further.  相似文献   

A statistical approach to disentangle environmental forcings in a lacustrine record: the Lago Chungará case (Chilean Altiplano)     

Santiago Giralt  Ana Moreno  Roberto Bao  Alberto Sáez  Ricardo Prego  Blas L. Valero-Garcés  Juan José Pueyo  Penélope González-Sampériz  Conxita Taberner 《Journal of Paleolimnology》2008,40(1):195-215

A high resolution multiproxy study (magnetic susceptibility, X-ray diffraction, XRF scanner, gray-colour values, Total Organic Carbon, Total Inorganic Carbon, Total Carbon and Total Biogenic Silica) of the sedimentary infill of Lago Chungará (northern Chilean Altiplano) was undertaken to unravel the environmental forcings controlling its evolution using a number of different multivariate statistical techniques. Redundancy analyses enabled us to identify the main provenance of the studied proxies whereas stratigraphically unconstrained cluster analyses allowed us to distinguish the “outsiders” as result of anomalous XRF scanner acquisitions. Principal Component Analysis (PCA) was employed to identify and isolate the main underlying environmental gradients that characterize the sedimentary infill of Lago Chungará. The first eigenvector of the PCA could be interpreted as an indicator of changes in the input of volcaniclastic material, whereas the second one would indicate changes in water availability. The chronological model of this sedimentary sequence was constructed using 17 AMS ¹⁴C and 1 ²³⁸U/²³⁰Th dates in order to characterize the volcaniclastic input and the changes in water availability in the last 12,300 cal years BP. Comparison of the reconstructed volcaniclastic input of Lago Chungará with the dust particle record from the Nevado Sajama ice core suggested that the Parinacota volcano eruptions were the main source of dust during the mid and Late Holocene rather than the dry out lakes as has previously been pointed out. The comparison of the water availability reconstruction of Lago Chungará with three of the most detailed paleoenvironmental records of the region (Paco Cocha, Lake Titicaca and Salar Uyuni) showed an heterogeneous (and sometimes contradictory) temporal and spatial pattern distribution of moisture. Although the four reconstructions showed a good correlation, each lacustrine ecosystem responded differently to the moisture oscillations that affected this region. The variations in the paleoenvironmental records could be attributed to the dating uncertainities, lake size, lake morphology, catchment size and lacustrine ecosystem responses to the abrupt arid events.  相似文献