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Radon Transform on spheres and generalized Bessel function associated with dihedral groups
Radon Transform spheres generalized Bessel function associated dihedral groups
2010/12/14
Abstract. Motivated by Dunkl operators theory, we consider a generating series involving a modified Bessel function and a Gegenbauer polynomial, that generalizes a known series already conside...
因为多波多分量地震勘探中P-P波和P-SV波通常混杂在一起,所以较好地分离P-P波和P-SV波能够提高数据处理和解释的质量.抛物线Radon变换法在分离P-P波和P-SV波时取得了一定效果,但是在离散叠加的计算过程中会带来假频,这些假频会干扰波场分离.本文针对这一问题,将多道相关算法引入抛物线Radon变换,发展了带有多道相关的抛物线Radon变换法.该方法利用叠加信号具有相似性的特点,依据多道相...
Temporal and spatial changes of radon concentration in borehole water
Temporal spatial changes radon concentration borehole water
2010/10/21
The 222Rn activity concentration in ground water from four boreholes was investigated from January 2006 to June 2008. The boreholes are situated in the region of the Astronomical and Geophysical Obser...
Soil-gas radon/helium surveys in some neotectonic areas of NW Himalayan foothills, India
Soil-gas radon helium neotectonic areas
2010/10/20
The present research is aimed at accessing the relationship between variation in the soil gases radon (222Rn) and helium (4He) and recently developed fissures and other neotectonic features in Nurpur ...
Spectral-decomposition techniques for the identification of radon anomalies temporally associated with earthquakes occurring in the UK in 2002 and 2008
Spectral-decomposition techniques identification radon anomalies temporally associated
2010/10/20
During the second half of 2002, the University of Northampton Radon Research Group operated two continuous hourly-sampling radon detectors 2.25 km apart in the English East Midlands. This period inclu...
Recent events in Haiti and Chile remind us of the devastation that can be wrought by an earthquake, especially when it strikes without warning. For centuries, people living in seismically active regio...
The contribution of groundwater discharge to the overall water budget of two typical Boreal lakes in Alberta/Canada estimated from a radon mass balance
groundwater discharge overall water budget typical Boreal lakes radon mass balance
2010/2/1
Radon-222, a naturally-occurring radioisotope with a half-life of 3.8 days, was used to estimate groundwater discharge to small lakes in wetland-dominated basins in the vicinity of Fort McMurray, Cana...
Radon measurements along active faults in the Langadas Basin, northern Greece
Radon measurements active faults the Langadas Basin, northern Greece
2009/12/9
A network of three radon stations has been established in the Langadas Basin, northern Greece for radon monitoring by various techniques in earthquake prediction studies. Specially made devices with p...
叠前含随机噪声地震数据抛物Radon变换法重建
随机噪声 抛物Radon变换 波场重建
2009/11/5
抛物Radon变换法是地震数据插值和外推的有效方法。由于该方法是沿抛物线路径进行积分的数据处理方法，所以在对地震数据插值重建的同时，可以压制随机噪声，提高地震资料的信噪比。为此，研究了抛物Rodon变换法在含随机噪声地震资料缺失数据重建中的作用，通过模拟的水平层状介质模型和二维复杂Marmousi模型数据插值和外推计算结果验证了方法的有效性，并通过实际地震数据的处理结果证明，抛物Radon变换法可...
Time-scale invariant changes in atmospheric radon concentration and crustal strain prior to a large earthquake
Time-scale invariant changes atmospheric radon concentration crustal strain earthquake
2009/11/2
Prior to large earthquakes (e.g. 1995 Kobe earthquake, Japan), an increase in the atmospheric radon concentration is observed, and this increase in the rate follows a power-law of the time-to-earthqua...
最优化相似加权Radon变换压制多次波
地震资料处理 分辨率 去噪
2009/11/2
多次波压制一直是地震资料处理的难题，常规方法多种多样，但都受到使用条件的限制，在实际应用中不能达到良好的效果。Radon变换是一种压制多次波的较好方法，如何提高Radon变换的分辨率一直困扰着地球物理工作者。在此提出了最优化相似系数加权法，该方法结合了相似系数加权法的优点能够较好地控制假频和截断效应，再结合GaussSeidel迭代的“最早迭代能量占优”的特点，能够提高Radon域的分辨率。通过...
R^n上广义Radon变换的奇异值分解
广义Radon变换 球谐函数 奇异值分解
2009/10/22
当广义Radon变换限制在带权的平方可积函数空间时, 该文构造了一类广义 Radon 变换的奇异值分解,给出了它们的逆变换的一些结果, 从而导出了广义 Radon 变换的反演公式以及值域的特征.
Radon变换是数据处理中广泛应用的一种方法技术.本文介绍了Radon变换在规则及其非规则观测系统中波场分离中应用，讨论了Radon变换的公式、实现方法和有关计算参数的选择.通过理论模型的试算，阐明了Radon变换在缺失道、道距变化情况下依然可以高精度的分离波场，并对线性、抛物Radon变换进行了比较，对隧道超前预报反射波资料进行了处理，给出了隧道超前预报处理流程中提取反射波的算例。
Tracing and quantifying groundwater inflow into lakes using a simple method for radon-222 analysis
groundwater radon-222 analysis
2009/5/13
Due to its high activities in groundwater, the radionuclide 222Rn is a sensitive natural tracer to detect and quantify groundwater inflow into lakes, provided the comparatively low activities in the l...
混合域高分辨率抛物Radon变换及在衰减多次波中的应用
高分辨率Radon变换 稀疏反演 循环矩阵 衰减多次波
2009/5/4
高分辨率Radon变换存在计算效率和分辨率不能兼得的困境.时间域算法可以获得很高的分辨率，但计算效率非常低；频率域算法具有良好计算效率，但分辨率不理想.为此发展了混合域高分辨率抛物Radon变换，即对频率域抛物Radon变换引入时变的稀疏权.本文给出了一种新的混合域高分辨率抛物Radon变换实现方法，并将该算法应用于叠前数据衰减多次波.文中给出了Radon变换和衰减多次波的流程.理论和实际数据算例...