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对地震信息网脑其开办以来所取得的效益进行了较全面的介绍,对国内外专业信息网站的发展趋向进行了分析,提出了中国地震信息网的发展目标及发展思路。 相似文献
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1我国地震信息网站建设概况
2004年初,中国地震局地震信息中心对我国网站进行了普查,据初步统计,目前,国内约有229家地震网站,其中200家网站保持正常运转状态,网站分布全国各地,小到区、县及学校社区,大多数以普及地震知识为主.地震信息网站建设中存在的主要问题有: 相似文献
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对加强地震政府网站地震突发事件信息保障工作的思考 总被引：1，自引：0，他引：1
地震政府网站是地震行业面向社会宣传防震减灾工作、服务公众的重要窗口.汶川、玉树地震后,地震工作越来越受到社会的关注,地震政府网站已成为社会公众和主流媒体、网站获取地震信息的重要平台,在抗震救灾中发挥着越来越重要的作用.本文通过地震政府网站在汶川、玉树等地震突发事件中信息保障工作的实践,从网站应急制度建设、编制网站应急预... 相似文献
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关于办好中国地震学会网站和《国际地震动态》刊物的倡议 总被引：1，自引：0，他引：1
中国地震学会网站：www．ssoc．org．cn已经开通。《国际地震动态》期刊是由中国地震学会和中国地震局地球物理研究所联合主办的科技类期刊。中国地震学会的网站和期刊是中国地震学会与全体会员之间进行学术和信息交流最密切的媒体。中国地震学会作为主办单位,对如何提高网站 相似文献
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作者对我国各省(直辖市、自治区)地震局在因特网上运行的信息网站进行了浏览,搜集了这些网站在地震数据服务方面的信息,从地震数据共享的角度,对我国省级地震局的因特网地震数据服务状况进行了分析。本文概要介绍分析结果,并对进一步发展因特网上的地震数据服务提出若干建议。 相似文献
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在对CDN原理和广东省地震信息网配置情况进行深入分析的基础上,结合智能DNS解析和内容缓存技术,实现了广东省地震信息网CDN全站加速的架构,并对该系统应用前后网站访问速度进行测试.结果表明该方案大幅提升了网站的访问速度和负载能力.最后,结合河源4.8级地震对网站的访问情况进行了统计分析,从网站流量统计、访问概况及WEB服务器负载3个方面进一步验证了系统的可靠性和实用性. 相似文献
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依据陕西地震台网速报信息发布流程,以及地震速报信息向地市地震网站发布的实际情况,利用"十五"门户网站管理软件,在技术上探讨了地震速报信息向市县级地震网站快速发布的三种方式. 相似文献
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Since at least three decades tributyltin had been commonly used in paint formulations to protect ship hulls and submersed surfaces from fouling. This has resulted in negative and Technology, effects to the marine environment due to its high toxicity towards non‐target organisms and to its accumulation in sediments, especially near point sources of pollution. Even if a ban of TBT for its application in anti‐fouling paints is enforced the problem of TBT‐contaminated sediments will remain for the coming years due to the low degradation rates of organotin in sediments. In this work an electrochemical process at a pilot scale to destroy TBT in sediments was investigated. Previous experiences at a laboratory and technical scale have demonstrated the potential of this process to electrolytically degrade organotin species in sediments. This article deals with the optimisation of the pilot plant performance in terms of organotin degradation and operation costs monitoring additionally the effect of the electrochemical treatment on other pollutants such as heavy metals, PCBs, and PAHs. The aim was to investigate by means of a parametric study the range of operating conditions required to destroy TBT down to concentrations lower than 100 μg/kg; to determine the influence of those parameters on the performance of the process; and to evaluate the operation costs associated to the process. It was determined that it was possible to destroy TBT down to 100 μg/kg at current densities in the range of 4.4 to 6.6 mA/cm2 and chloride concentrations of least of 0.2 mol/L with operation costs of 13 to 18 EUR/m3. 相似文献
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B.M. Coughlan G.A. Moroney F.N.A.M. van Pelt N.M. O&#x;Brien J. Davenport J. O&#x;Halloran 《Marine pollution bulletin》2009,58(11):1680-1684
This study investigated the internal osmotic regulatory capabilities of the Manila clam (Ruditapes philippinarum) following in vivo exposure to a range of salinities. A second objective was to measure the health status of the Manila clam following exposure to different salinities using the neutral red retention (NRR) assay, and to compare results using a range of physiological saline solutions (PSS). On exposure to seawater of differing salinities, the Manila clam followed a pattern of an osmoconformer, although they seemed to partially regulate their circulatory haemolytic fluids to be hyperosmotic to the surrounding aqueous environment. Significant differences were found when different PSS were used, emphasizing the importance of using a suitable PSS to reduce additional osmotic stress. Using PSS in the NRR assay that do not exert additional damage to lysosomal membrane integrity will help to more accurately quantify the effects of exposure to pollutants on the organism(s) under investigation. 相似文献
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The impacts of climate change on storm runoff and erosion in Mediterranean watersheds are difficult to assess due to the expected increase in storm frequency coupled with a decrease in total rainfall and soil moisture, added to positive or negative changes to different types of vegetation cover. This report, the second part of a two‐part article, addresses this issue by analysing the sensitivity of runoff and erosion to incremental degrees of change (from ? 20 to + 20%) to storm rainfall, pre‐storm soil moisture, and vegetation cover, in two Mediterranean watersheds, using the MEFIDIS model. The main results point to the high sensitivity of storm runoff and peak runoff rates to changes in storm rainfall (2·2% per 1% change) and, to a lesser degree, to soil water content (?1·2% per 1% change). Catchment sediment yield shows a greater sensitivity than within‐watershed erosion rates to both parameters: 7·8 versus 4·0% per 1% change for storm rainfall, and ? 4·9 versus ? 2·3% per 1% change for soil water content, indicating an increase in sensitivity with spatial scale due to changes to sediment connectivity within the catchment. Runoff and erosion showed a relatively low sensitivity to changes in vegetation cover. Finally, the shallow soils in one of the catchments led to a greater sensitivity to changes in storm rainfall and soil moisture. Overall, the results indicate that decreasing soil moisture levels caused by climate change could be sufficient to offset the impact of greater storm intensity in Mediterranean watersheds. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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常规岛主厂房是一种特殊的工业建筑结构,具有质量、刚度分布不均、多错层等特点,其抗震重在保证电厂运行功能在设防预期的水准地震作用下不中断,避免重大设备损坏而造成的严重财产损失.基于性能的抗震设计方法是目前国际上先进的抗震设计方法.首次将设计流程引入到核电站常规岛主厂房结构抗震设计中,在小震和中震弹性分析基础上,采用基于纤... 相似文献
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Mike Herzfeld 《Ocean Dynamics》2009,59(1):21-46
An operational limited-area ocean modelling system was developed to supply forecasts of ocean state out to 3 days. This system
is designed to allow non-specialist users to locate the model domain anywhere within the Australasian region with minimum
user input. The model is required to produce a stable simulation every time it is invoked. This paper outlines the methodology
used to ensure the model remains stable over the wide range of circumstances it might encounter. Central to the model configuration
is an alternative approach to implementing open boundary conditions in a one-way nesting environment. Approximately 170 simulations
were performed on limited areas in the Australasian region to assess the model stability; of these, 130 ran successfully with
a static model parameterisation allowing a statistical estimate of the model’s approach toward instability to be determined.
Based on this, when the model was deemed to be approaching instability a strategy of adaptive intervention in the form of
constraint on velocity and elevation was invoked to maintain stability. 相似文献
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结合清原地震台台站水准1985年前后观测成果精度的变化，总结了提高台站短水准观测成果精度的几点主要成功措施。它们是：选择最佳视线长度；拓宽线路、增高视线、减弱折光影响；改造仪器站条件；固定观测时间和人员；确定好观测光段。 相似文献
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将用于图像处理的光顺技术引用到速度谱能量团曲面的处理环节,借以提高速度谱的分辨率,为最终获得高精确解提供一全新的途径.具体思路是基于路径积分优化法--Viterbi算法所具有的自动搜寻及获取最优解的功能,将其应用于地震资料处理中的速度自动拾取,使其向前做最大"能量团"的积分向后递归计算最优解--叠加速度,但这种解的准确性往往与所定义的目标函数--速度谱的分辨率有关.演算结果表明,Viterbi算法与关顺处理技术的有机结合,不仅提高了速度提取的精度,而且实现了速度的自动拾取,可提高常规地震资料处理的效率,从而可快捷地为叠前深度偏移提供所需初始速度模型. 相似文献
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Using taxa as indicators of environmental impacts is widespread. Indicators are chosen because they are considered to be easy to measure, sensitive to stresses and respond to stresses in predictable ways. Here, we review these criteria by addressing the nature of the relationships between some characteristic of taxa and the environmental variables they are supposed to indicate. It is crucial that variables measured as indicators be strongly and consistently correlated (through space and time) with levels of the environmental variables. Appropriate experiments must be done to establish that an observed correlation is causal, or the correlation cannot be considered sufficient to identify a useful indicator. Finally, it is necessary to establish that the taxa directly respond to changes in the environmental variables they are supposed to indicate. Appropriate methodologies to establish these criteria are considered and we evaluate studies in which these criteria have or have not been met. 相似文献
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Biotic structures and processes of the comparatively large and deep Lake Constance are dominated by pelagic water bodies. Therefore, much more attention has thus far been paid to the carbon cycle of pelagic habitats as compared to littoral areas. Nevertheless, there is also an ongoing debate on the importance of littoral areas for the carbon cycle in this lake. Although actually existing data are certainly insufficient for a realistic carbon budget, investigations made during the past decade provide at least a rough basis for a first evaluation. Accordingly, littoral areas appear to contribute overproportionally (related to surface) both to production as well as to degradation of organic carbon in the lake. However, the relative effect seems to be more pronounced for heterotrophic activities, mostly due to intense degradation processes in littoral sediments. Related to volume, littoral water bodies exhibited similar or slightly higher microbial activities as compared to epilimnetic pelagic water bodies, while microbial abundances and activities observed for littoral sediments exceeded the corresponding overlying water layers by one to three orders of magnitude. As was confirmed by in situ measurements microbial oxygen consumption frequently exceeded photosynthetic oxygen production in the investigated littoral sites. Moreover, significant qualitative differences between water and sediment were found for the degradation potentials of xenobiotics as was exemplified for phenol and nitrilo-triacetic acid (NTA). Overall, a buffer function at the landwater interface may be ascribed to littoral areas due to which the large pelagic water bodies of the lake may become additionally protected against loads of undesired organic substances due to high littoral degradation capacities. 相似文献