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991.
Andr Augusto Rodrigues Salgado Rgis Braucher Fabrice Colin Hermínio Arias Nalini Jr. Anglica Fortes Drummond Chicarino Varajo Csar Augusto Chicarino Varajo 《Journal of Geochemical Exploration》2006,88(1-3):313
This paper investigates the denudation rates in the Quadrilátero Ferrífero, Minas Gerais State (Brazil). The aim is to compare chemical weathering rates from measurements of solute fluxes in rivers and long-term mean erosion rates deduced from in situ-produced cosmogenic 10Be concentrations measured in fluvial sediments. Both water samples and sediments were collected in fifteen stations (checkpoints) located in four hydrographic basins with low anthropogenic perturbations.Depending of the type of substratum, three degrees of chemical denudation rates from water samples are observed: (i) high rates in marbles; (ii) medium rates in schists, phyllites, granites, gneisses and migmatites; (iii) low rates in quartzites and itabirites. Preliminary results of long-term erosion rates deduced from in situ-produced 10Be are comparable with those of chemical rates. 相似文献
992.
本文利用近震、地方震的各种震相的走时方程,经过变换,取得相应的二次型目标函数。对目标函数用一维寻查法、均值寻查法求出其零值点的自变量,即求得各个方程的解;再用均值寻查法求得各个方程的共解,即得震源位置。随机地处理了自2000~2003年6月福建数字地震遥测台网记录到的本省及周边地区的205个地震,定位结果显示走时残差的平均值为0.25s。在可供比较的前提下,将159个地震数据的奇异值分解法的结果与本文的结果进行对比,前者的平均走时残差为0.72s,后者为0.25s,且后者的每一个地震的走时残差都比前者小。 相似文献
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995.
2005年在西藏达孜县羌堆铜矿区进行了1/2.5万的路线土壤测量(40 km2),路线土壤测量省力经济,适用于地形复杂、植被发育的通行困难地区;根据土壤测量的地化异常特征推断了3条断裂、3个半隐伏-隐伏的斑岩体,发现12处地化异常,其中11-A为已知矿致异常,8-A,4-B,6-A,9-A异常分别为寻找斑岩型铜矿、构造蚀变岩型金矿的良好靶区,可安排地质物探综合普查. 相似文献
996.
Brigitte Leblon Eric Kasischke Marty Alexander Mark Doyle Melissa Abbott 《Natural Hazards》2002,27(3):231-255
Research was carried out to assess the potential of imaging radar systems formonitoring forest fire danger. In Canada, daily forest fire danger ratings are generated by the Canadian ForestFire Danger Rating System (CFFDRS), based on estimates of fire weather indices (FWI) and measured foliar moisturecontent (FMC). To evaluate the potential of imaging radar, an experiment was conducted using test sitesconsisting of jack pine, black spruce and white spruce stands located in the MacKenzie river basin, NorthwestTerritories, Canada. Radar image intensity values from ERS-1 SAR imagery collected over these stands in 1994 werecompared to FWI indices and FMC data. FWI indices were calculated using data from local weather stations.Seasonal trends in radar backscatter (0) were shown to correlate with temperature and precipitation. Significant relationships were found between 0 and FWI codes and indices, particularly in thecase of the black spruce stands, with slow-drying fuels, like duff moisture code (DMC), drought code (DC), and build-upindex (BUI). Rates of changes in 0were related to rates of changes in FMC, particularly in the case ofthe jack pine stands for old FMC and in the case of white spruce stands for composite FMC. 相似文献
997.
1997年初夏云南严重干旱的诊断分析 总被引:14,自引:2,他引:12
对1997年初夏云南发生的严重干旱灾害从大气环流和海气相互作用角度对其成因进行了详细的诊断研究,提出了一个考虑物理诊断与统计预测相结合的云南初夏降水综合预测方案,对作好该地区的气候预测有一定的参考价值。 相似文献
998.
本文讨论了CT多平面重组(MPR)影像的重建方法,阐述了原始扫描的条件设定,扫描方法的重要性。正确地掌握这些要领,将可获得高质量的多平面重组图像。 相似文献
999.
ERS-1 radial positioning using the JGM-2 and JGM-3 gravity fields is assessed by analysing dual crossovers with TOPEX/Poseidon,
neither field containing ERS-1 data. This method allows a more complete recovery of ERS-1 radial orbit error, specifically
of the previously unattainable mean geographical error. The global analysis shows that the theoretical error derived from
the JGM-2 covariance matrix is realistic and that JGM-3 represents a slight improvement, at least at the inclination of ERS-1.
A latitudinal-based study in the southern ocean indicates possible weaknesses in both fields, notably for low and resonant
geopotential orders m. A refinement of JGM-2, RGM-2, is undertaken through inclusion of ERS-1 and STELLA laser tracking and ERS-1 altimetry, reducing
several of its deficiencies.
Received: 14 May 1996 / Accepted: 17 February 1997 相似文献
1000.