Ultraviolet absorption cross-sections of chloro and chlorofluoro-methanes at stratospheric temperatures     

P. C. Simon  D. Gillotay  N. Vanlaethem-Meuree  J. Wisemberg 《Journal of Atmospheric Chemistry》1988,7(2):107-135

Absorption cross-sections of nine halomethanes (CCl₄, CHCl₃, CH₂Cl₂, CH₃Cl, CFCl₃, CF₂Cl₂, CF₃Cl, CHFCl₂, and CHF₂Cl), measured between 174 and 250 nm for temperatures ranging from 225 to 295 K, are presented with uncertainties ranging from 2 to 4% and compared with previous determinations made for comparable temperature ranges.The largest temperature effect which takes place near the absorption threshold, decreases the absorption cross-section up to 50% for highly chlorinated methanes, but is negligible for molecules highly stabilized by hydrogen and/or fluorine. Extrapolated values for temperatures of aeronomical interest are presented, as well as parametrical formulas which give absorption cross-section values for given wavelength and temperature ranges.  相似文献   

用相关系数估计导线点误差椭圆参数     

张兰英 《华东地质学院学报》1988,(3)

用比例误差k和导线边数n所表示的坐标相关系数r,当导线走向α=45°时,误差椭圆大小、形状与相关系数之间存在一个简单的数学关系式,在导线设计时可用作精度估算。  相似文献   

Modelling Local Seismograms of French Nuclear Tests In Taourirt Tan Afella Massif, Hoggar, Algeria     

S. Gaffet  B. Massinon  J.-L. Plantet  Y. Cansi 《Geophysical Journal International》1994,119(3):964-974

  相似文献   

Application of the telluric and magnetotelluric methods in selection of sites for nuclear plants     

A. Ádám  J. Verö 《Journal of Earth System Science》1990,99(4):657-667

The paper deals with the application of the telluric method and of magnetotelluric soundings including experimental and model data on the localization of tectonic disturbances in connection with the selection of appropriate sites for nuclear plants.  相似文献   

A SEARCH TECHNIQUE FOR CHOOSING OPTIMUM PARAMETERS IN NUMERICAL WEATHER PREDICTION     

Liu Jin  Yan Hong 《Acta Meteorologica Sinica》1991,5(5):598-607

The steepest descent(or ascent)search is employed for finding optimum diffusion coefficients in T42L9Gmodel,with a view to improving the model's computational stability or prediction accuracy.The method of thesteepest descent search is first described,in which the golden section search is chosen as the fundamental one-dimensional search used in the multi-dimentional steepest descent search,and then the optimization of the dif-fusion coefficients is described.  相似文献   

用大地测量资料反演滇西地震预报实验场断裂带的活动段     

黄立人  肖木 《地震研究》1994,(3)

本文根据滇西地震预报实验场的部分大地测量资料应用反演方法研究了区内活动断裂带的现今活动段。结合地震活动和地震地质资料对地震危险区作了进一步的估计。  相似文献   

Deposition of trace substances via cloud interception on a coniferous forest at Kleiner Feldberg     

S. Pahl  P. Winkler  T. Schneider  B. Arends  D. Schell  R. Maser  W. Wobrock 《Journal of Atmospheric Chemistry》1994,19(1-2):231-252

A resistance model to calculate the deposition of cloud droplets on a coniferous forest and some improved parameterizations of the indispensable input parameters are described. The deposition model is adapted to the coniferous forest at the Kleiner Feldberg site and verified by the data of a drip water monitoring station below the forest canopy. The measurements of liqud water content, wind speed and trace substance compounds in cloud water of the Ground-based Cloud Experiment (GCE) at Kleiner Feldberg in 1990 are used to calculate the cloud water deposition fluxes and the deposition of trace substances via cloud water interception. The calculated deposition of trace substances via cloud water interceptions is three to six times higher than via rain during the experiment. On a long term data basis the yearly amount of cloud water deposition is 180 mm year^–1 at Kleiner Feldberg site (840 m a.s.l.) while the precipitation amount is 1030 mm year^–1. Due to higher trace substance concentrations in cloud water compared to rain the ionic deposition via cloud water interception and via precipitation were assessed to be of comparable magnitude.  相似文献   

滇西试验场重力潮汐观测及其地震响应特征的研究   总被引：4，自引：0，他引：4  

李瑞浩  刘贵安 《中国地震》1995,11(2):161-167

本文使用Ｎａｋａｉ预处理、Ｖｅｎｅｄｉｋｏｖ调和分析和滑动滤波等方法，对滇西地震实验场下关台ＧＳ１５－２２７重力仪１９８７－１９９２年 观测资料进行了系统分析，，确定了该地区最佳重力潮汐参数及潮汐和非潮汐动态变化背景，并对观察期间的６个震例进行清理，分析了重力异常变化与地震的关系，获得了该地区重力潮汐和非潮汐信息的地震响应特征。  相似文献   

滇西实验场两次中强地震前后尾波衰减的区域特征分析   总被引：9，自引：0，他引：9  

秦嘉政  刘祖荫 《中国地震》1995,11(3):212-221

本文在地方震尾波散理论模式的基础上，研究了１９９２年１２月发生在滇西地震预报实验场永胜期纳地区的两次Ｍｓ５．４，５．１地震前后的序列地震尾波振幅衰减率β和尾波Ｑ＾－１值随时间和空间变化的衰减特征。结果表明，尾波衰减率在空间分布上表现出明显的小区域范围的非均匀性，在主震震中附近的近场区内，主震期间的β值是０．００７６ｓ＾－１，相应的Ｑｃ＾－１值是０．００５６；余震期间的β值是０．０２０９ｓ＾－１，相  相似文献   

五寨4.8ML地震宏观考察与震害评估     

Survey Group of Wuzhai Earthquake 《山西地震》1995,(2):42-47

本文介绍了对１９９３的９月１１日五寨４．８ＭＬ地震的考察情况，确定宏观震中在五寨县丰兑坡与河曲县土沟村一带，震中烈度为６度。计算得出本次地震的总经济损失约１５万元。  相似文献