流动注射分光光度法同时测定水中挥发酚及氰化物     

陈素兰章勇  盛冬梅 《江苏地质》2005,29(3):162-164

在单针进样器的基础上，增加一个三通流路同时进样，在线消解-流动注射分光光度法测定水中挥发酚及氰化物。实验结果表明，挥发酚浓度在0mg/L～0．2mg／L、氰化物浓度在0mg/L～0．5mg／L范围内具有良好的线性关系。通过在线气体扩散分离技术，提高了分析速度，每小时可完成12个～15个样品的分析。方法的相对标准偏差〈5％，回收率在90．4％～108．5％之间。  相似文献   

青藏高原多,少雪年后期西北干旱区降水的对比分析   总被引：17，自引：5，他引：12  

吴统文  李培基 《高原气象》1998,17(4):364-372

利用１９５７－１９９０年高原地区的雪深,地面气温,地温以及西北干旱区部分站强降水量资料等,进行了高原地区多,少雪年积雪特下,地震热状况以及西北干旱区的期降水量的对比分析和相关分析。  相似文献   

Nonlinear and multifractal approaches of the geomagnetic field   总被引：2，自引：0，他引：2  

L. Hongre  P. Sailhac  M. Alexandrescu  J. Dubois 《Physics of the Earth and Planetary Interiors》1999,110(3-4):157-190

Recent nonlinear dynamics techniques have been developed to analyse chaotic time series data. We first summarize the procedure which gives an appropriate reconstruction of the unknown dynamics from scalar measurements in a pseudophase space. It permits, firstly, the representation of the trajectories of the dynamical system—they define an attractor when the system is dissipative—by preserving its topological properties. We then present the invariant measures and ergodic quantities such as the multifractal spectrum and Lyapunov exponents which can be estimated on the reconstructed attractor. The multifractal analysis provides us with a characterization of the scaling energy of the process whereas the Lyapunov exponent gives another statistical measure of the stability of the dynamics. The estimation of these quantities was tested on synthetic data. The nonlinear and multifractal analyses were finally applied to the hourly mean values of the magnetic field recorded at the Eskdalemuir (ESK) observatory over 79 years (692,520 data measurements for each component). The estimations of a 5-dimensional pseudo-phase space and a positive Lyapunov exponent confirm the possibility of low-dimensional deterministic chaos in the magnetic field observations at ESK observatory. The correlation between the solar activity (the Wolf number), the unstable nature of the magnetic field, and the singularity spectrum points out the forcing of the solar cycles on the dynamics of the magnetic field at ESK observatory.  相似文献   

北疆阿巴宫-库尔提断裂带显微组构的运动学和动力学分析   总被引：3，自引：0，他引：3  

杨新岳 《大地构造与成矿学》1990,14(1):29-42

研究了阿尔泰地区NW走向高角度冲断构造中主干的阿巴宫—库尔提断裂带。详细研究了断裂构造岩的变形构造和组构及其所显示的运动学和动力学特征。结果表明:存在早、晚更替且性质不同的变形显微构造。早期以糜棱岩中的韧性变形构造为主,发育有递进变形的不对称构造(压力影、旋转变斑晶、S—C构造等),是断裂中剪切变形运动指向的主要判据。晚期为脆性破裂构造,与早期变形组构具继承、叠加关系。研究了石英光轴的组构形式,证实存在:早期共轴纯剪变形的小圆环带组构和非共轴简单剪切变形中,呈递变关系的点极密—大圆环带—交叉大圆环带组构型式。对变形构造和组构所作的运动学和动力学分析结果表明:阿—库断裂带的形成和变形历史为:①地壳早期NE挤压收缩环境,形成劈理化带;②在持续NE向挤压作用下,大规模剪切、逆冲叠置,和地壳加厚,产生重熔岩浆和流体再分配效应,促使糜棱岩带形成和发展;③晚期地壳NE向挤压下,以垂直差异抬升和大量碎裂岩化高角度逆冲断裂的继承、叠加为特征。在区域大地构造的关系上:①、②对应于地槽褶皱、封闭的地槽体制(海西期),③对应于地洼体制(后海西期)。  相似文献   

Assessment of reliability in water distribution networks using entropy based measures   总被引：2，自引：0，他引：2  

K. Awumah  I. Goulter  S. K. Bhatt 《Stochastic Environmental Research and Risk Assessment (SERRA)》1990,4(4):309-320

Entropy based expressions for measurement of reliability and redundancy have recently been reported. These measures approach assessment of the reliability of the distribution network from the intrinsic redundancy of the network layout. The paper extends earlier work on entropy functions by including a more explicit statement of the alternate paths available in the network and by recognizing that under certain circumstances, e.g., failure of some part of the network work, an outflow link from a node under normal working condition may become an inflow link to the same node. The measures are assessed by comparison with parameters measuring Nodal Pair Reliability and percentage of flow supplied at adequate pressure for a range of networks and link failure conditions in this networks. The entropy measures are shown to reflect changes in the network reliability, as measured by these two comparative parameters, very well.  相似文献   

Neoproterozoic to Early Cambrian history of an active plate margin in the Teplá–Barrandian unit—a correlation of U–Pb isotopic-dilution-TIMS ages (Bohemia, Czech Republic)     

W. Drr  G. Zulauf  J. Fiala  W. Franke  Z. Vejnar 《Tectonophysics》2002,352(1-2)

The Teplá–Barrandian unit (TBU) of the Bohemian Massif shared a common geological history throughout the Neoproterozoic and Cambrian with the Avalonian–Cadomian terranes. The Neoproterozoic evolution of an active plate margin in the Teplá–Barrandian is similar to Avalonian rocks in Newfoundland, whereas the Cambrian transtension and related calc-alkaline plutons are reminiscent of the Cadomian Ossa–Morena Zone and the Armorican Massif in western Europe. The Neoproterozoic evolution of the Teplá–Barrandian unit fits well with that of the Lausitz area (Saxothuringian unit), but is significantly distinct from the history of the Moravo–Silesian unit.The oldest volcanic activity in the Bohemian Massif is dated at 609+17/−19 Ma (U–Pb upper intercept). Subduction-related volcanic rocks have been dated from 585±7 to 568±3 Ma (lower intercept, rhyolite boulders), which pre-dates the age of sedimentation of the Cadomian flysch ( t chovice Group). Accretion, uplift and erosion of the volcanic arc is documented by the Neoproterozoic Dob í conglomerate of the upper part of the flysch. The intrusion age of 541+7/−8 Ma from the Zgorzelec granodiorite is interpreted as a minimum age of the Neoproterozoic sequence. The Neoproterozoic crust was tilted and subsequently early Cambrian intrusions dated at 522±2 Ma (T ovice granite), 524±3 Ma (V epadly granodiorite), 523±3 Ma (Smr ovice tonalite), 523±1 Ma (Smr ovice gabbro) and 524±0.8 Ma (Orlovice gabbro) were emplaced into transtensive shear zones.  相似文献   

几个矿床技术经济评价问题探讨     

张福祯 《化工矿产地质》1997,19(1):58-62

矿床技术经济评价在地质勘查工作中占有重要地位。目前编写地质勘查报告都必须包括技术经济评价章节。但我国矿床技术经济评价的理论和方法还存在一些问题，某些评价方法和基本概念还不够统一。通过对投资回收期、净现值、总现值、销售成本、经营成本等参数的研究认为，矿床技术经济评价要进一步规范化。  相似文献   

Algorithm of Calculation of Lyapounov Coefficients for Analysis of Chemical Autooscillations, as Applied to Calcite Crystallization Model     

N. A. Bryxina  V. S. Sheplev 《Mathematical Geology》2001,33(8):993-1010

The numerical algorithm of calculation of Lyapounov coefficients (L _k) of any order is developed. The apparatus of analytical calculations is not used in this algorithm. The proposed algorithm is of use for usual computer languages and allows us to find the numerical value of L _k for any k and to make complete qualitative analyses of dynamic models on the plane.  相似文献   

青藏高原北侧地区干湿年夏季垂直环流差异的对比分析及青藏高原的热力影响   总被引：30，自引：2，他引：30  

吴统文  钱正安 《气象学报》1996,54(5):558-568

为了分析西北干旱的形成原因，本文首先利用高原北侧地区５站历年夏季的降水量资料等，制定了该区的干湿标准，划分了历年夏季的干湿等级。接着又利用ＥＣＭＷＦ的格点资料等对比分析了该区干湿年夏季间垂直环流的差异，也探讨了青藏高原地面热状况与高原北侧干湿状况的联系。其主要结论是：１）文中制定的以降水标准差为判据的干湿标准适合西北干旱区；２）高原北侧干湿年夏季间在高原北侧和高原上的垂直环流存在明显差异；３）青藏高原地面热状况与上列差异有关，也即青藏高原的热力作用是西北干旱的重要成因之一。  相似文献   

ENSO 循环过程中逐月海温异常的合成分析   总被引：1，自引：0，他引：1       下载免费PDF全文

钱维宏  丑纪范 《应用气象学报》1996,7(2):145-152

文章基于UK和MIT 1990年整编的12年（1968～1977年和1982～1983年）逐月5°×5°经纬网格点的海温（SST）距平资料，对其间发生的4次El Nino事件和3次La Nina事件作了逐月全球SST异常分布的合成分析。合成结果表明:在El Nino事件的形成阶段，赤道中太平洋存在明显的东传暖性低频扰动；而在La Nina事件的形成阶段，南北美沿岸有稳定增强的冷中心向西发展。  相似文献