内蒙古二连盆地阿特巴音敖包地区eU、eTh、K等天然放射性水平调查评价     

王浩锋  刘波  陈霜  彭瑞强  薛文浩 《物探化探计算技术》2019,(1):110-120

为了对内蒙古二连盆地阿特巴音敖包调查区铀成矿潜力做出评价,通过对其天然放射性水平测量数据的统计分析、参数构建等手段,多维度探索了铀(eU)、钍(eTh)、钾(K)元素含量及γ照射量率在空间上的分布规律及其变化趋势。结合区域地质资料对古铀含量、活化铀量、铀迁移富集指数、地化活动性指数等新构建参数特征进行了综合解释,成功预测了调查区铀成矿有利地段,经钻探查证,发现了良好的铀矿化信息。  相似文献   

中国极端强降水日数与ENSO的关系   总被引：13，自引：0，他引：13       下载免费PDF全文

李威  翟盘茂 《气候变化研究进展》2009,5(6):336-342

利用G分布函数对中国1951-2004年地面台站逐日降水观测资料进行雨日降水量概率分布拟合并定义极端降水事件,在此基础上对极端降水日数与ENSO的关系进行分析研究。结果表明,ENSO对同期的极端降水发生频率在不同地区和不同季节表现出不同的影响作用。总体而言,中国极端降水事件更易发生在厄尔尼诺年的冬春季和拉尼娜年的夏秋季。极端降水在对ENSO强信号的滞后响应上,其发生频率在时空上发生了变化,主要表现为,多数地方更易在ENSO暖位相出现后的半年左右发生极端降水事件。研究表明,ENSO冷暖信号对我国极端降水事件多寡的影响具有不对称性。  相似文献   

Status of the ROTSE‐III telescope network     

S. A. Yost  F. Aharonian  C. W. Akerlof  M. C. B. Ashley  S. Barthelmy  N. Gehrels  E. Gü  T. Güver  D. Horns  Ü. Kzlolu  H. A. Krimm  T. A. McKay  M. zel  A. Phillips  R. M. Quimby  G. Rowell  W. Rujopakarn  E. S. Rykoff  B. E. Schaefer  D. A. Smith  H. F. Swan  W. T. Vestrand  J. C. Wheeler  J. Wren  F. Yuan 《Astronomische Nachrichten》2006,327(8):803-805

ROTSE‐III is a homogeneous worldwide array of 4 robotic telescopes. They were designed to provide optical observations of γ ‐ray burst (GRB) afterglows as close as possible to the start of γ ‐ray emission. ROTSE‐III is fulfilling its potential for GRB science, and provides optical observations for a variety of astrophysical sources in the interim between GRB events. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)  相似文献   

Rayleigh wave phase velocities in the Pacific with implications for azimuthal anisotropy and lateral heterogeneities     

Clyde E. Nishimura  Donald W. Forsyth 《Geophysical Journal International》1988,94(3):479-501

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与高能质子共生的两类太阳微波爆发(英)     

李春生 《天文学进展》1997,(4)

在分析了近年来对太阳射电爆发与高能质子观测的基础上指出，既非II型也非米波IV型而是强微波爆发几乎总是同高能质子共生的；这一结果否定了以前长期所持的观点。同高能质子共生的微波爆发可分成两类：强脉冲型和强微波IV型，前者共生的被俘质子或相互作用质子要多于逃逸质子，后者则常共生有更多的逃逸质子．作者对每种情况中质子的有效加速过程进行了考虑，并对强微波爆发为何几乎总是有高能质子共生的缘由作了解释．  相似文献   

STARE Results on a Single Field: Tens of New Pulsating Stars     

Roi Alonso  Juan Antonio Belmonte  Tim Brown 《Astrophysics and Space Science》2003,284(1):13-16

We present preliminary results on variable stars of aSTARE's three month observational run centered at the Cygnus constellation.A total amount of aprox. 14000 stars with 9^2 FOV, have been analyzed to obtainlightcurves for each of these stars.The data spans for 90 nights.In this single field, we detect more that 40 stars withpulsation modes between 5 and 40 c/d, the vast mayoritypreviously unknown to be variables.  相似文献   

On comparative probabilities for normal confidence intervals by pearson's Types III and VII, and the Edgeworth series models for biotite data     

S. K. Banerjee  E. L. Zodrow 《Mathematical Geology》1982,14(6):565-575

Biotite crystals were counted in standard thin sections which originated from the diamond drill core of the mafic norite formation at Strathcona mine, Sudbury Nickel Irruptive. Pearson's method of moments is suitable to fit Types III and VII to the biotite data and its log ₁₀ transformation values, as the number of samples (thin sections)is large (351).Based on the two models and the Edgeworth series (utilizing the log ₁₀ data)probability values p,that biotite occurrences lie in the interval mean ± Z standard deviations is derived. Results are compared with the usual normal probability values p_Z corresponding to Zand it is shown that the Edgeworth series generated the largest pvalues for intervals when p_Z values are large; for intermediate or lower p_Z s. Types VII and III models produced larger ps, relative to the Normal and the Edgeworth series.  相似文献   

    

A. Grassia 《Mathematical Geology》1982,14(4):321-330

Discovery sampling is a simple sampling inspection technique which has been used by internal auditors during the last 30 years. Occasionally it has found application in agricultural research. It will be shown that an amended version of this technique can be used in the sampling of orebodies for the presence of particles of a mineral such as gold, silver, uranite, and so forth. While with the classical Discovery sampling a simple discrete distribution (Multinomial, Poisson, etc.)is involved, in our case convolutions of a discrete (Poisson)and continuous distributions (gamma, lognormal)occur, because of the indirect procedure used in detecting the presence of the mineral in the orebody. Illustrative examples using two distributions of gold particles are given.  相似文献   

针对储层裂缝检测的三维P波地震采集设计参数分析     

李忠  梁波  贺振华  黄德济  刘鸿  唐方远 《物探化探计算技术》2006,28(4):305-309

理论和实践表明,垂直定向排列的裂缝能够诱导方位各向异性,三维P波地震是一种经济有效的裂缝勘探方法。合理的三维勘探有利于从三维地震数据中提取和增强有效的属性参数,来表征方位各向异性,达到检测和预测储层裂缝的目的。这里通过综述目前常用的纵波裂缝检测技术,结合部分实际数据,总结了三维P波采集方案设计的一些基本原则,为储层裂缝检测提供了野外设计方面的参考。  相似文献   

类Crab脉冲星的三维磁层外隙模型     

郑广生  张力 《天文学进展》2001,19(2):184-196

利用三维脉冲星磁层模型研究了磁层外隙的几何结构,首先用自治模型确定“外隙”的垂直尺度,在该模型中外隙尺度受回流的外隙流（带有隙加速的带电粒子发射的曲率光子）加热极帽而产生的热光子的碰撞而成对生成所限,外隙的横向尺度也受本地对生成所限,在脉冲星的磁层中,原则上有两个拓扑分离的外隙,允许同时进入和流出粒子,不过,流入粒子流产生的辐射形态受隙了本地对生成和恒星附近的磁对生成的严格制约,根据外隙及其本地结构的三维模型计算了类Crab脉冲星的辐射和相位分解谱。  相似文献