Passive Acoustic Mapping with the Angular Spectrum Method

A Critique on Power Spectrum – Area Fractal Method for Geochemical Anomaly Mapping

Power spectrum – area fractal (S-A fractal) method has been frequently applied for geochemical anomaly mapping. Some researchers have performed this method for separation of geochemical anomaly, background and noise and have delineated their distribution maps. In this research, surface geochemical data of Zafarghand Cu-Mo mineralization area have been utilized and some defects of S-A fractal me...

An Angular Open Mapping

Spectrum Skeletonization: A New Method for Acoustic Signal Feature Extraction

Vibration Analysis Tests (VAT) and Acoustic Emission tests (AE) are used in several industrial applications. Many of them perform analysis in the frequency domain. Peaks in the power density spectrum hold relevant information about acoustic events. In this paper we propose a novel method for feature extraction of vibration samples by analyzing the shape of their auto power spectrum density func...

The Angular Power Spectrum of Edsgc Galaxies

We determine the angular power spectrum Cl of the Edinburgh/Durham Southern Galaxy Catalog (EDSGC) and use this statistic to constrain cosmological parameters. Our methods for determining Cl and the parameters that affect it are based on those developed for the analysis of cosmic microwave backgroundmaps. We expect them to be useful for future surveys. Assuming flat cold dark matter models with...

Angular-planar CMB power spectrum

Gaussianity and statistical isotropy of the universe are modern cosmology's minimal set of hypotheses. In this work we introduce a new statistical test to detect observational deviations from this minimal set. By de ning the temperature correlation function over the whole celestial sphere, we are able to independently quantify both angular and planar dependence (modulations) of the CMB temperat...