ABSTRACT Spectral energy distribution (SED) of the broad-band continuum emission from black-hole accretion discs can serve as a tool to measure parameters central body and constrain geometry inner flow. We focus on case an active galactic nucleus (AGN), with disc dominating UV/optical bands. parametrize changes in thermal power-law components, which reveal diminution emissivity. To this end we ...

In this paper we show new formulas for the spectral radius and the spectral subradius of a set of matrices. The advantage of our results is that we express the spectral radius of any set of matrices by the spectral radius of a set of symmetric positive definite matrices. In particular, in one of our formulas the spectral radius is expressed by singular eigenvalues of matrices, whereas in the ex...

A subset of R d with nite positive Lebesgue measure is called a spectral set if there exists a subset R such that E := n e i2h;xi : 2 o form an orthogonal basis of L 2 ((). The set is called a spectrum of the set. The Spectral Set Conjecture states that is a spectral set if and only if tiles R d by translation. In this paper we prove the Spectral Set Conjecture for a class of sets R. Speciicall...

satellite imagery was used as a rapid and spatially explicit method to delineate crop residue cover and to estimate the use and intensity of conservation tillage. the potential of multispectral high-spatial resolution of worldview-2 local data was evaluated using 11 satellite spectral indices and linear spectral unmixing analysis (lsua). experimental plots were examined; residue cover was measu...