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241.
Optimization of the shape of Gaussian beams 总被引:1,自引:0,他引:1
K. Žáček 《Studia Geophysica et Geodaetica》2006,50(3):349-366
The applicability and accuracy of the Gaussian beam method depend on the proper choice of the shape of beams. Gaussian beams
become inaccurate solutions of the elastodynamic equation if the velocity field changes considerably within the beam width.
We present a procedure of determining the optimum initial shape of Gaussian beams based on minimizing the average squared
widths of Gaussian beams and smoothing the distribution of the optimum parameters of Gaussian beams on the Hamiltonian hypersurface
in the phase-space. The original method of smoothing represents an essential part of the algorithm, which is designed particularly
for the optimization of the shape of Gaussian beams for Gaussian beam or packet migrations. 相似文献
242.
243.
图像平滑与边缘检测的迭代算法 总被引:2,自引:0,他引:2
图像平滑和边缘检测是图像处理、计算机视觉等领域研究的经典问题。区别以往对这两个问题独立求解的做法,文中作者将图像平滑与边缘检测问题结合起来综合考虑。首先,提出了基于全局边缘特征的边缘检测算法并对自适应平滑算法进行了改进。然后,利用迭代处理的思想对图像进行平滑和边缘检测,得到了迭代的平滑与边缘检测算法。实验表明,该算法可以有效地解决平滑过程中的细节保持和边缘检测时剔除伪边缘这两个难题。 相似文献
244.
Genetically meaningful decomposition of grain-size distributions 总被引:2,自引:0,他引:2
All spatio-temporal grain-size patterns in sediments can be characterized by a mathematical representation of (un)mixing. This implies that an inverse model of (un)mixing would be ideally suited to obtain genetically meaningful interpretations of observed grain-size distributions (GSDs). GSDs are therefore often decomposed into theoretical end members by parametric curve-fitting procedures. Many researchers have been tempted to use goodness-of-fit measures as a means of justifying such decompositions in the absence of generic process-based models of end-member GSDs. A critical examination of parametric curve fitting through a series of numerical experiments shows that the goodness-of-fit of an approximation may be a poor guide to its genetic significance. The genetic interpretation of GSDs is a poorly constrained problem that cannot be solved without taking into account the geological context of GSDs, which may be captured by the covariance structure of grain-size classes across a series of GSDs sampled in a contiguous area. Curve-fitting methods cannot exploit this geological context, which explains why the geological relevance of curve-fitting results obtained in black-box mode is questionable. The desired genetic interpretation of GSDs can be obtained by applying the end-member-modelling algorithm EMMA to a series of GSDs simultaneously. Many end-member GSDs estimated by EMMA do not conform to one of the popular theoretical GSD models. Consequently, parametric curve fitting with theoretical distributions is more likely to obscure than to reveal the existence of genetically significant grain-size populations in sediments, especially if such populations are present in small proportions. 相似文献
245.
246.
A statistical method is presented for smoothing discriminant analysis classification maps by including pixel-specific prior probability estimates that have been determined from the frequency of tentative class assignments in a window moving across an initial per-point classification map. The class at the center of the window is reevaluated using the data for that location and the prior probability estimates obtained from the window area. An example using Landsat spectral data demonstrates the effectiveness of the method and shows an increase in classification accuracy after smoothing. 相似文献
247.
RESOLUTION OF STRONGLY OVERLAPPING TWO-WAY MULTICOMPONENT DATA BY MEANS OF HEURISTIC EVOLVING LATENT PROJECTIONS 总被引:3,自引:0,他引:3
High-performance liquid chromatography with diode array detection(HPLC-DAD)is used tocharacterize mixtures from chlorophyll α degradation experiments.Overlapping chromatographic peaksare resolved by means of the heuristic evolving latent projections(HELP)method.The HELP methodis a self-modelling curve resolution method.No assumptions are made about spectral and/orchromatographic peak shape.In the first step the method establishes the real noise level in the data byuse of the so-called zero-component regions.This information is used to reveal selective chromatographicinformation and the number of chemical species at every retention time in unresolved chromatographicpeaks.Utilising the selective chromatographic regions in combination with the zero-concentrationwindows,unique resolution into concentration profiles and spectra of the pure chemical species isaccomplished.HPLC-DAD data from six chlorophyll a degradation experiments were analysed.Consistent results were obtained even with very similar spectra for six or seven overlapping chemicalcomponents. 相似文献
248.
ZHOU Jianjun LIN Binganand WANG Lianxiang Dr. of Eng. Research engineer the Institute of Water Conservancy Hydroelectric Power Research 《国际泥沙研究》1991,(1)
A new mathematical model for 2-D flow is formulated with accurate satisfac tion of boundary conditions in conjunction with square or any grids,so that it may also yield accurate results when the domain of computation is in the shape of a strip as occurring in rivers. The basic equations are split into three sets of compo- nent equations of which two sets may be transformed to the same form. This model is a part or a model devised for 2-D flows with sediment. 相似文献
249.
In the analysis of Chinese earthquake history byLee andBrillinger (1979), the autointensity function of the earthquake sequence is estimated, based on a parametric model for the catalog inclusion probabilities. We show that an estimate of the autointensity function with essentially the same features can be obtained by smoothing the data to yield a nonparametric estimate of the inclusion probabilities. In addition, however, we illustrate that a somewhat less smooth estimate would lead to an autointensity function with little structure. The shape of the estimated autointensity function is hence dependent on the assumed smoothness of the inclusion probabilities. This is an issue which cannot be resolved statistically. 相似文献
250.