Results 1 to 10 of about 20,094 (246)
Genetic Algebras Associated with ξ(a)-Quadratic Stochastic Operators [PDF]
Entropy, 2023 The present paper deals with a class of ξ(a)-quadratic stochastic operators, referred to as QSOs, on a two-dimensional simplex. It investigates the algebraic properties of the genetic algebras associated with ξ(a)-QSOs.
Farrukh Mukhamedov +3 more
doaj +2 more sources
CompaGB: An open framework for genome browsers comparison [PDF]
BMC Research Notes, 2011 Background Tools to visualize and explore genomes hold a central place in genomics and the diversity of genome browsers has increased dramatically over the last few years.
Chiapello Hélène +4 more
doaj +2 more sources
Fine Classification of QSOs and Seyferts for Activity Types Based on SDSS Spectroscopy
Frontiers in Astronomy and Space Sciences, 2021 Using the SDSS spectroscopy, we have carried out fine optical spectral classification for activity types for 710 AGN candidates. These objects come from a larger sample of some 2,500 candidate AGN using pre-selection by various samples; bright objects of
A. M. Mickaelian +3 more
doaj +1 more source
Applied Sciences, 2021 This paper presents isomorphic circuits of voltage-mode (VM) non-inverting bandpass filters (NBPFs) and VM quadrature sinusoidal oscillators (QSOs) with independent amplitude control functionality.
San-Fu Wang +3 more
doaj +1 more source
Independent analysis of μδ data of ILS and INDLS catalogs to obtain the spin of the bright Gaia DR2 reference frame [PDF]
Serbian Astronomical Journal, 2021 The Gaia DR2 reference frame should be without relative rotation to the quasars (QSOs) and consistent with the International Celestial Reference System (ICRS).
Damljanović G. +2 more
doaj +1 more source
Harnessing Unresolved Lensed Quasars: The Mathematical Foundation of the Fluctuation Curve
The Astrophysical Journal, 2023 Strong gravitational lensed quasars (QSOs) have emerged as powerful and novel cosmic probes as they can deliver crucial cosmological information, such as a measurement of the Hubble constant, independent of other probes. Although the upcoming LSST survey
Satadru Bag +3 more
doaj +1 more source
A Bias-free Cosmological Analysis with Quasars Alleviating H 0 Tension
The Astrophysical Journal Supplement Series, 2023 Cosmological models and their parameters are widely debated because of theoretical and observational mismatches of the standard cosmological model, especially the current discrepancy between the value of the Hubble constant, H _0 , obtained by Type Ia ...
Aleksander Łukasz Lenart +4 more
doaj +1 more source
The Astrophysical Journal, 2023 The recent discovery of enormous Ly α nebulae (ELANe), characterized by physical extents >200 kpc and Ly α luminosities >10 ^44 erg s ^−1 , provides a unique opportunity to study the intergalactic medium and circumgalactic medium in distant galaxies ...
Jessica S. Li +10 more
doaj +1 more source
On the Nature of Soft X-ray Weak Quasi-Stellar Objects [PDF]
, 1999 Recent studies of QSOs with ROSAT suggest the existence of a significant population of Soft X-ray Weak QSOs (SXW QSOs) where the soft X-ray flux is ~ 10-30 times smaller than in typical QSOs.
A. Laor +16 more
core +3 more sources
Polarization of Broad Absorption Line QSOs I. A Spectropolarimetric Atlas [PDF]
, 1999 We present a spectropolarimetric survey of 36 broad absorption line quasi-stellar objects (BAL QSOs). The continuum, absorption trough, and emission line polarization of BAL QSOs yield clues about their structure.
A. R. Martel +11 more
core +3 more sources