地震信息化共用服务平台设计与实现     

帅向华  董翔  席楠  李继赓  李华玥 《中国地震》2021,37(1):170-184

随着信息技术的飞速发展和信息化的推进,各个项目建设均要对硬件、网络、数据库、软件平台和系统进行重复的规划与建设,项目建设的系统越多,操作系统和应用服务的部署和运维就面临着越大的挑战,同时也造成了大量硬件资源的浪费,需要较高的成本进行维护.本文介绍了地震信息化项目中,利用云计算和大数据技术构建地震信息化共用服务平台,通过...  相似文献   

Unintended consequences: The spillover effects of common property regulations     

Gordon Rausser  Stephen Hamilton  Marty Kovach  Ryan Stifter 《Marine Policy》2009

The closure of the Hawaiian longline swordfish fishery over the period 2001–2004, which was motivated by the protection of endangered sea turtles, created the elements of a natural experiment that allows identification of the market transfer of catch (and sea turtle bycatch) to other regions. This paper exploits the fact that the vessels in the Hawaiian longline fishery sell their catch in the US fresh swordfish market to analyze the pattern of changes in US fresh and frozen swordfish consumption both before and after the closure regulation was imposed. The mechanisms by which any unintended consequences on endangered sea turtles in other fishery locations in the world are shown to take place through the US swordfish market. At the estimated annual market transfer, a bootstrap analysis of the probability distribution of bycatch rates indicates that the regulation led to an additional 2882 sea turtle interactions at the sample means.  相似文献   

Estimating the effects of technological efficiency on the European fishing fleet     

Sebastian Villasante  Ussif Rashid Sumaila 《Marine Policy》2010

By comparing the real reductions in fishing capacity of the European Union (EU) and the effects of technological efficiency, this paper presents the first comprehensive analysis since the creation of the Common Fisheries Policy (CFP). Using a standard methodology and a conservative value of ±4.4% for annual technological progress, the results obtained for tonnage indicated that the EU-13 fleet's fishing capacity was reduced by >4% for only three years (1991, 2004, and 2006) in the 1987–2006 period.  相似文献   

倾角分解共反射面元叠加方法   总被引：13，自引：4，他引：9       下载免费PDF全文

杨锴  许士勇  王华忠  马在田 《地球物理学报》2005,48(5):1148-1155

共反射面元（Common Reflection Surface）叠加是一种独立于宏观速度模型的零偏移距剖面成像方法,传统的CRS叠加实现是以数据驱动的方式对属性参数进行自动搜索并对其进行优化合成相应的CRS叠加算子,通过该算子进行叠加能够得到信噪比和连续性更高的零偏移距剖面.但是数据驱动的实现方式带来了不可避免的“倾角歧视现象”,它造成了弱有效反射信号损失和运动学特征失真的问题.本文提出的倾角分解CRS叠加方法成功解决了上述问题,使CRS叠加方法更具实用价值.  相似文献   

陆面模式中土壤和植被经验参数随机误差的传播研究   总被引：3，自引：1，他引：2  

梁晓  戴永久 《大气科学》2010,34(2):457-470

数据质量问题和模式参数化方案的非完备性是陆面模拟中不确定性的主要来源。本文将高斯误差传播原理 (Gaussian Error Propagation, GEP) 应用于通用陆面模式 (the Common Land Model, CoLM), 研究关键的植被和土壤属性参数随机误差在模式中的传播, 确定由此类误差导致的CoLM模拟的不确定性。结果表明: (1) 基于本研究给定的土壤和植被参数的不确定性, CoLM模拟的表层土壤温度、 土壤湿度和植被蒸散通量 (植冠蒸腾+地表蒸发) 的相对误差分别为0.11%、 34.07%和5.58%; 砂土和稀疏森林上模拟效果最差。土壤参数随机误差对CoLM模拟的影响高于植被参数, 而土壤水文参数 (孔隙率、 饱和基质势、 气孔尺寸分布指数和饱和导水率) 对各模拟量不确定性的贡献率均远大于热力参数 (饱和反照率和热容)。对于本研究涉及的所有模拟变量而言, 最关键的参数均是气孔尺寸分布指数b, 这可能与描述基质势与体积水含量关系的函数有关, 其次重要的是砂土的孔隙度和粘土的饱和导水率。混交森林上的根深分布和苔原上的动力学粗糙度对蒸散通量贡献显著。本身相对误差大的经验参数对CoLM模拟不确定性的贡献不一定多。 (2) 干燥条件下 (表层液态水饱和度小于0.1) 土壤温度的不确定性大; 相变发生时刻附近 (表层土壤温度在0℃附近且表层液态水含量大于0) 土壤湿度不确定性显著; 蒸散通量的不确定性随本身绝对值的增大而增大, 在相对温暖干燥环境中 (表层土壤温度高于280 K且表层液态水饱和度小于0.3) 其不确定性最高。研究证实, GEP能够辨识CoLM中需优先提高观测精度的关键参数和关键参数化过程, 对陆面模拟的参数选定、 不确定性评估和模式完善具有重要意义。  相似文献   

Domestic temporalities: Nature times in the house-as-home     

Emma R. Power 《Geoforum》2009,40(6):1024-1032

Studies of domestic temporalities have emphasised the timing of social activities and interactions in the home, including how family members negotiate their use of home spaces and technologies, the impact of flexible work practices on home, and the organisation of care and mothering activities. But home is also shaped by the rhythms and times of nonhumans that inhabit, travel through and are part of the house-as-home; it is further shaped by the environment outside home. Drawing inspiration from recent discussions of nature times the paper explores the more-than-human temporalities of domestic space. It charts the ageing and decay of house structures, the disruption caused by nocturnal animals, and the seasonal cycles of sunlight and plant growth that immediately surround the home, attending to the ways that these events shape everyday experiences of home and homemaking. These times and rhythms are examined through interviews undertaken with people living with uninvited brushtail possums in the ceilings of their homes, interviews and diaries completed by new dog owners, interviews with gardeners, and analysis of popular Australian homemaking magazines. These stories emphasise the dynamic and unfolding nature of the house-as-home as a hybrid timespace produced through an ongoing entwinement of human and nonhuman, living and non-living, culture and nature.  相似文献   

基于Geodatabase极地NetCDF验潮数据的存储与分析     

马林波  张洪文  朱李忠  金丽华  宿裕 《测绘工程》2012,21(2):43-45

针对MATLAB读取南极验潮数据所出现的问题以及南极验潮数据本身的特点,结合ArcGIS9.2推出的Multidimension Tools和Geodatabase,设计出NetCDF格式的南极验潮站数据存储和处理的一般流程,并利用MATLAB混合编程的数值计算和分析功能,有效地对南极验潮数据进行存储管理和分析,为NetCDF格式的地理数据的读取、存储提供一种解决的思路。  相似文献   

Hepatic biotransformation genes and enzymes and PAH metabolites in bile of common sole (Solea solea, Linnaeus, 1758) from an oil-contaminated site in the Mediterranean Sea: a field study     

Trisciani A  Corsi I  Torre CD  Perra G  Focardi S 《Marine pollution bulletin》2011,62(4):806-814

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数值模拟的尺度调节机理     

陈可洋 《内陆地震》2011,(4):321-328

为了使地震波正演数值模拟系统适合于不同尺度情况下的数值计算,提出了不同尺度数值模拟均需满足的4个共性条件和2个调节机理(即稳定和频散调节机理).认为空间尺度的变化与主频成反比,与时间步长成正比,在保证数值计算过程稳定和较高数值模拟前提下,根据尺度调节机理可以合理地选择波场模拟参数,实现不同尺度快速稳定、高精度的波场正演...  相似文献   

Blueprint for breakdown? Community Based Management of rural groundwater in Uganda     

《Geoforum》2015

The belief that groundwater in rural areas is best managed according to the Community Based Management (CBM) model is the dominant paradigm across Sub-Saharan Africa. While donors and governments focus on extending the supply network to meet the post-2015 Sustainable Development Goal (SDG) of universal access to clean water, at any one time a third of handpumps are non-functional. Basing our case on ethnographic fieldwork, surveys and interviews, and working closely with policy implementers over the course of three years in mid-west Uganda, we argue that non-functionality of handpumps, and the precarious status of many, cannot be blamed solely on poor technology or siting of wells: rather the problem stems from a dearth of maintenance funds and management failings. The CBM model is an uneasy coalition of ideologies from across the political spectrum that meshes neo-liberal inspired commodification with theories of collective action and Common Property Resources. We demonstrate conceptually and empirically how the wings of the CBM model individually and collectively are contributing to the disappointing outcomes amid the messy complex reality of rural environments. Recommendations calling for modifying participatory processes, technological solutions and more external support all fall within the existing CBM framework, which we will empirically demonstrate is a blueprint for breakdown in these contexts. A resolution to the financing of handpump maintenance must be found if the SDG is to be realised, and we argue that academics, policy makers and practitioners need to accept this may lie outside the CBM paradigm.  相似文献