This paper describes the use of image processing to measure lightness changes of fabric appearance. The lightness changes due to dyeing, washing and exposure to light treatments are studied. These properties are measured by using the changes in the intensity levels of the fabrics image and the L* obtained by a spectrophotometer. For each case, analysis of variance (ANOVA) is carded out and the...

Radio surveys at frequencies of ∼ 1 GHz allow to map the synchrotron emission (SE) in a frequency range where (except for very low Galactic latitudes or towards localized regions) it dominates over the other radio components. New all sky total intensity and polarization data at 1.4 GHz have been recently collected. We focus on the Galactic radio emission correlation properties described in term...

This paper presents a generalized formula of spatial correlation (SC) approximation with closed-form solution for three-dimensional (3D) incoming waves in multipath fading environment. The derivation of the formula is based on a novel model of angular power spectrum (APS) and the validity is verified by simulation results.

This paper presents a spatial fading emulator for evaluating handset MIMO antennas in a cluster environment. The proposed emulator is based on Clarke’s model and has the ability to control RF signals directly in spatial domain to generate an accurate radio propagation channel model, which includes both uniform and non-uniform angular power spectra (APS) in the horizontal plane. Characteristics ...

The statistical characteristics of the angular power distribution of the wireless channel in mine tunnels are the concern of this paper. Firstly, we develop a ray-based channel model which provides the angular power spectrum (APS) in tunnels. We discuss the allowed rays existing in a tunnel based on the modal theory. The number of the allowed rays is limited. The directions of the rays are disc...

[email protected] Abstract The channel characterization of handset MIMO antennas in a browsing position has been studied in a propagation environment with a narrow angular power spectrum (APS), such as a street Microcell. We have attempted to make an analytical approach to clarify how a MIMO antenna oriented in a browsing position functions in a street Microcell environment, with re...

The Fermi-LAT collaboration has recently reported the detection of angular power above the photon noise level in the diffuse gamma-ray background between 1 and 50 GeV. Such signal can be used to constrain a possible contribution from Dark-Matter-induced photons. We estimate the intensity and features of the angular power spectrum (APS) of this potential Dark Matter (DM) signal, for both decayin...

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...

Abstract We analyze the angular power spectrum (APS) of unresolved gamma-ray background (UGRB) emission and combine it with measured properties resolved sources Fermi-LAT 4FGL catalog. Our goals are to dissect composition sky establish relevance different classes source populations active galactic nuclei in determining observed size UGRB anisotropy, especially at low energies. find that, under ...