It formalizes the relationship between the estimation of spectral lines and sparse approximation, insisting on the specificities of the model, caused notably by the irregular nature of the sampling scheme. The chapter analyzes and compares several iterative (greedy) methods, and presents techniques ...
is k-sparse and thus line 3 spectral estimation in the presence of noise can be thought of as a sparse approximation problem. The regularization parameter for the strongest guarantee in Theorem 1 is given in terms of the expected dual norm of the noise and can be explicitly computed for many...
(ter Braak 2006;2008). We found, in general, that these approaches agreed when the data were "good"--even optimal estimation (with its gaussian posterior approximation, like any non-linear minimizer)--but disagreed when the data were sparse (low wavelength coverage, low SNR etc.)--...
various spectral components, which is termed subband coding, and frequency bands are divided in half by the high-pass and low-pass filters in the decomposition process, we can apply one level of decomposition and take just the first approximation (coefficients a1[n]) for the reconstruction ...
LS-SVM is a machine learning method dealing with linear and non-linear data efficiently [25]. LS-SVM uses a hyperplane to fit the spectral data. The calculation process uses sparse approximation, robust regression and Bayesian inference [26]. Compared with the support vector machine [27], the...
In case of 1H 0323+342 the broken power-law is just an approximation, as the spectrum show additional complexity. Adapted from [99]. A likely explanation for the X-ray spectra of 𝛾γ-ray-emitting NLSy1 is that the underlying Seyfert emission, originating from the corona and accretion ...
来源期刊 Optics & Spectroscopy 1961/01/01 研究点推荐 Line Intensities Raman Spectra Quantum Model 0关于我们 百度学术集成海量学术资源,融合人工智能、深度学习、大数据分析等技术,为科研工作者提供全面快捷的学术服务。在这里我们保持学习的态度,不忘初心,砥砺前行。了解更多>> 友情链接 联系我们 ...
The spectra of many Seyfert galaxies display broad Fe K 伪 emission. The line profile has two maxima, suggesting that the line emerges in the innermost regions of an accretion disk around a black hole, making it necessary to take into account general relativistic (GR) effects. Identifying GR ...
Theory of Line Intensities in the Combination Scattering Spectra. 1. Quantum Model {(Condon} Approximation)Krushinsky, L LShorygin, P P
Electronic absorption and resonance Raman spectra are studied for the case in which a sparse manifold of radiatively bright zeroth-order states is non-radiatively coupled to a dense manifold of dark states. In particular, a time-domain approach to the computation of the resonance lineshapes induced...