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叙述了《中国图书资料分类法地震文献分类表》的基本纲要,该分类表是结合地震系统实际情况而编制成的,一方面符合《中国图书资料分类法》的编制原则和体系结构,另一方面对结合地震科学和地震系统文献收藏特点,其内容比较充实,填补了地震科技资料分类工作的空白,已在地震系统普遍推广应用。 相似文献
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作者根据自己近年来所做的工作及经验,叙述了计算机联网后,地震系统的图书资料室工作人员该怎么做的问题。 相似文献
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论述了地震科技信息与图书资料的关系,反映了浙江省地震局在科技文献自动化管理方面汽取得的进展以及存在的问题。并就地震科技文献自动化管理软件提出了几点改进建议。 相似文献
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主要介绍了地震系统科技资料的达标验收工作情况。各单位按照国家地震局的有关要求用《中国图书资料分类法地震文献表》及“标引规则”对科技资料进行了统一分类，按《地震科技资料著录实施细则》进行标准的著录，重建帐卡。 相似文献
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由中国地震学会、全国地震标准化技术委员会、中国地震学会编辑委员会共同举办的标准化基础知识培训班,于2005年11月6—9日在云南省大理市召开。来自中国地震局系统和全国有关单位81名代表参加了培训班。他们中包括科研、技术观测人员,图书资料管理人员,从事地震法制与标准化管理的人员以及从事地震图书与期刊编辑出版工作的编辑人员。 相似文献
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基于SD模型分析的环鄱阳湖地区发展模式探讨 总被引：2，自引：2，他引：0
系统动力学(SD)模型在模拟复杂的区域发展问题中具有明显优势,本文在深入分析环鄱阳湖地区区域发展各子系统、各要素之间关系的基础上,构建了区域发展SD模型,并通过设立4种发展情景模拟了不同发展模式下区域发展特征.结果表明,惯性发展不仅发展速度较慢,同时将带来严重的生态与环境问题;高经济增长低环保投入发展尽管保持了经济的高速增长,但对生态环境将造成较大程度的破坏;高经济增长高环保投入方式通过加大环保投入,能较好地解决经济高速增长所带来的污染问题;而强调经济结构调整的产业优化升级发展方式在保证经济较高速发展的同时,较好地维持了区域生态环境的良性循环.充分考虑环鄱阳湖地区区域特征,本文综合各模式优劣势,提出了推荐发展模式,以实现经济增长与生态环境保护之间的平衡. 相似文献
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法制建设与防震减灾事业发展的互为作用 总被引：1，自引：0，他引：1
从法理学的角度,探讨了防震减灾法制建设与防震减灾事业发展的内在关系和相互作用。防震减灾事业的社会化进程,促进了防震减灾法的形成,影响着法体内容和表现方式、立法体制和调整范围;同样,防震减灾法的实施,推动了事业的综合全面发展,确认了责利关系与发展方向,促进了地震科学技术的进步。正是这种内在的互动与互为关系,形成了共同进步的原动力。 相似文献
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新时代背景下,少儿科普读物有助于培养少儿读者的科学精神,有助于提升整体国民的科学素养和意识.本文在分析少儿地震科普读物内涵的基础上,比较了国内外主要读物的知识内容和表现形式,分析了现阶段少儿地震科普读物存在的问题与不足,进而提出了新时代背景下,我国少儿地震科普读物的创新发展路径,具体包括:树立"少儿本位"的优先发展原则... 相似文献
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Alluvial floodplain classification by multivariate clustering and discriminant analysis for low‐relief glacially conditioned river catchments 
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下载免费PDF全文 River classifications provide useful frameworks to understand complex fluvial landscapes and to manage freshwater ecosystems. Alluvial floodplains for rivers in low‐relief glacially conditioned catchments of southern Ontario (Canada) are classified and tested using a sequence of multivariate statistical analyses. An original dataset of 109 floodplain sites is investigated using k‐means clustering, principal component analysis, and discriminant analysis statistical approaches. Four primary floodplain types are proposed representing basic morphological, stratigraphical, and sedimentological characteristics. Classifications are successfully discriminated by two principal dimensions: (1) stream power‐resistance; and (2) floodplain sedimentology. The latter is most efficiently represented by the availability of alluvial sand, and specifically a new variable defined as floodplain sand equivalent (FSE). Floodplain types are generally consistent with previous river classifications, however the glacial legacy requires refined classifications which account for inherited cobble bed materials and patterns of sand supply. Representing the residual variability of stream power‐resistance correlations, a third explanatory dimension of sediment transport is suggested, and may explain some within‐class variability in channel morphology. Balancing the opposing concepts of fluvial process domains and landform continuums, the potential for transitional floodplain types is also explored. The proposed first‐order alluvial floodplain classifications provide a basis from which to further investigate geomorphological diversity within the context of complex glacial legacy effects in low‐relief settings. Future research to reveal the spatial arrangement and linkages of distinct morphological groups within a regional landscape mosaic is expected to provide insights into patterns of post‐glacial fluvial adjustment. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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The effect of the modifications of the threshold values generally adopted for the five EcoQ (Ecological Quality) classes recognized by the European Water Framework Directive (WFD) for the most used benthic indicators and diversity indicators (AMBI, BENTIX, BOPA, BQI, H', ITI and M-AMBI) were studied to test whether it is possible to obtain the same or similar ecological classifications for transitional waters using these different indicators, and determine whether the current classifications can be improved. The analysis included: (i) the use of indicator equations, (ii) the use of reference indicators, and (iii) the use of indicator distribution laws. These investigations demonstrated that it was impossible to obtain an exact intercalibration of the ecological classifications with the selected indicators. However, some propositions to improve the actual classification were suggested. 相似文献
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Discharges of effluent in urbanized littoral areas produce nonlinear changes in benthic organisms. Data on the composition of the benthic community are often used to obtain environmental quality classifications that serve to indicate the health of the environment. This study conducted a comparative analysis of the polychaetes associated with mussel beds and related these results to the values of environmental variables at both reference and sewage-impacted sites over a 10 year period in a rocky intertidal habitat on the coast of the SW Atlantic. The results of the study showed spatial and temporal differences in the abundance and dominance of the polychaetes. The study also furnished evidence of a decrease in the environmental quality of the area. This study allowed the classification of the polychaetes into ecological groups, facilitating the calculation of environmental quality indexes. 相似文献
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刘国权 《CT理论与应用研究》2000,9(Z1):6-9
本综述论文首先引入文献中体视学狭义和广义的定义及领域范围,然后举例介绍了(狭义)体视学的用途.狭义地讲,体视学是根据其截面或投影图像获取三维结构定量信息的一门科学;广义地,则可认为体视学覆盖了与多维结构或图像的理解、重建及定量分析有关的原理、方法、软硬件研究、制造及应用等所有内容.不同定义中有一点是共同的,即体视学是一门关于多维几何结构及图像的边缘和交叉科学分支.体视学方法在地球科学中有以下可能的应用:1)辅助监测火山岩浆囊的活动:2)辅助寻找地质上非常稳定的地区以用于特定目的(如埋藏核废料); 3)辅助探测地下矿产资源和能源,由地下地震波速度和衰减参数的三维分布、电磁波衰减参数的三维分布图以圈定成矿带:4)结合三维地电法深测地下古墓葬和地下水的空间分布以及大型桥梁基础软弱带等.由电磁波和电阻率等CT技术得到桥梁地基、地铁隧道(tunnel)附近的精细的三维剖面图像体视学则可望用于根据这些剖面图像进-步定量描述其对应的三维构造,在保证这些建筑物质量时起到重要的作用:5)由地幔温度的三维分布探测地幔热柱和地热区的热容量分布,以决定地热田开发的规模,并能经济合理地决定地熟钻井的位置和深度.由此可见,体视学应用于地球科学是很用前途的.本文最后向读者推荐了-组与体视学有关的书、刊或论文.希望本文对不同学科领域中感兴趣于相关边缘或交叉学科研究与应用的科技工作者有所帮助. 相似文献
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Ton Snelder José Barquín Ortiz Doug Booker Nicolas Lamouroux Hervé Pella Ude Shankar 《Aquatic Sciences - Research Across Boundaries》2012,74(1):45-59
Top-down methods for defining stream classifications are based on a conceptual model or expert-defined rules, whereas bottom-up
methods use biological training data and statistical modelling. We compared the performance of six classification methods
for explaining the taxonomic composition of invertebrate and fish assemblages recorded at 327 and 511 sites, respectively,
distributed throughout France. Classification 1 and 2 were top-down classifications; The European Water Framework System A
(WFDa,) and the French Hydro-ecoregions (HER 2). Four bottom-up classification procedures of increasing complexity were defined
based on 11 variables that included watershed characteristics describing climate, topography, and geology, and site characteristics
including elevation, bed slope and temperature. Classification 3 was defined using matrix correlation (MC) to select a combination
of variable categories that produced the best discrimination of the observed taxonomic composition. Classification 4 and 5
were defined by clustering the sites based on their taxonomic data and then using linear discriminant analysis (LDA) and Random
forests (RF) to discriminate the clusters based on the environmental variables. Classification 6 was defined using generalized
dissimilarity modelling (GDM). Our hypothesis was that the bottom-up classifications would perform better because they flexibly
accommodate complex relationships between compositional and environmental variation. We tested the classifications using the
classification strength statistic (CS). The RF-based classification fitted the taxonomic patterns better than GDM or LDA and these latter classifications generally
fitted better than the MC, WFDa or HER classifications. Cross validation analysis showed that differences in predictive CS (i.e. the CS statistics produced from sites not used in defining the classifications) were often significant. However, these differences
were generally small. Gains in predictive performance of classifications appear to be small relative to the increase in complexity
in the manner in which environmental variables are combined to define classes. 相似文献
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The design code for each country is revised and updated based on an expected zone’s seismic intensities,geotechnical site classifications,structural systems,construction materials and methods of construction in order to provide more realistic considerations of seismic demand,seismic response,and seismic capacity.Based on the aforementioned provisions,structures designed according to different seismic codes may yield different performances for the same level of hazard.This study aims to investigate and compare the induced responses related to the earthquake-resistant design of reinforced concrete(RC)buildings according to the Saudi building code(SBC-301),American code(ASCE-7),uniform building code(UBC-97),and European code(EC-8).In order to account for the provision regarding the hazard specification and its effect on the induced seismic responses,four regions in the Kingdom of Saudi Arabia with different seismic levels are selected.The code provisions related to the specification of site classification and its effect on the induced design base shear are investigated as well.Significant differences are observed in the induced responses with the variation in seismic design codes for the considered seismic hazards and site classifications. 相似文献
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对内蒙古测震台网2008年以来速报的346次地震（包括天然地震与爆破、塌陷）进行统计,以典型震例,分区域、分类别总结震相特征。在此基础上,讨论利用典型震例与波形互相关性在未来地震定位与震相精确识别方面应用的可能性,及利用非常规震相（sPn震相）准确测定震源深度的应用前景。通过以上分析,以期进一步提高内蒙古地震速报和编目工作质量。 相似文献
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Medical Geology,the emerging discipline that focuses on the health impacts of geologic materials and geologic processes,has its roots in Guizhou Province,China.In the 1980 s Prof.Zheng Baoshan and his students recognized that a large number of people in Guizhou Province had clinical symptoms of arsenic poisoning,fluorine exposure,selenosis,and other diseases caused by exposure to potentially toxic trace elements or due to deficiency of essential elements.Their publications and invitations to scientists to visit the Province ultimately resulted in increased attention to the health impacts of the natural environment and the formation of scientific societies,the publication of at least a dozen books,and thousands of technical articles on what is now called Medical Geology. 相似文献
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Summary For the discussion of the physico-chemical state and the phase transitions in the earth interior it is necessary to compare the results of geophysical field measurements with geophysical solid state investigations in the laboratory under extremep,T-conditions. In correspondence with the theoretical studies about the behaviour of the materials in the deep earth we investigated two groups of materials: (I) different types of rocks with reference to their elastic and thermal behaviour under extreme conditions, (II) simple compounds of elements which belong possibly to the representatives of the deep mantle and the earth interior. The method for measurement of the thermal diffusivity and the influence of anisotropy on the propagation of elastic waves in different rocks is described. The results of the dependence of the electric resistivity on pressure and temperature on synthetic and natural chalkogenides of the 3d-transition metals are discussed.Publication No. 474 of the Central Earth Physics Institute, Academy of Sciences, 15 Potsdam, Telegrafenberg, GDR. 相似文献