Results 1 to 10 of about 5,154 (184)
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
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Symposium - International Astronomical Union, 1983 The evidence for the evolution of the intergalactic clouds that produce the Lyman-alpha absorption lines in the spectra of QSOs is reviewed. The recent detection of OVI in clouds that produce both Lyman-alpha and Lyman-beta absorption lines is discussed.
B. A. Peterson
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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
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Resolved imaging and spectroscopy of QSOs [PDF]
Symposium - International Astronomical Union, 1986 We have obtained direct images and off-nuclear spectra for five QSOs having a wide range of radio, optical and X-ray luminosity. Four objects show absorption features identified with stars in a host galaxy, and off-nuclear changes in emission line wavelengths.
Paul Hickson, J. B. Hutchings
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QSO search by slitless spectroscopy [PDF]
Symposium - International Astronomical Union, 1986 Sandage and I have obtained “grism” plates that redundantly cover one square degree fields centered on ten Selected Areas. We used a grating-prism in the converging beam of the Mayall 4-meter telescope prime focus to photograph 1580 A·mm−1 slitless spectra to a limit of about B = 21.5 (cf. Hoag and Smith 1977).
A. A. Hoag
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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
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The 2dF-SDSS LRG and QSO Survey: the spectroscopic QSO catalogue [PDF]
Monthly Notices of the Royal Astronomical Society, 2009 We present the final spectroscopic QSO catalogue from the 2dF-SDSS LRG (luminous red galaxy) and QSO (2SLAQ) survey. This is a deep, 18 < g < 21.85 (extinction corrected), sample aimed at probing in detail the faint end of the broad line active galactic nuclei luminosity distribution at z≲ 2.6 .
Lance Miller +31 more
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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
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QSO Absorption Lines from QSO
The Astrophysical Journal, 2006 Accepted for publication in ApJ Letters.
Gordon T. Richards +10 more
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The QSO Evolution Derived from the HBQS and Other Complete QSO Surveys [PDF]
The Astronomical Journal, 1997 Submitted to AJ, 14 pages: LaTex file ass2pp4.sty, 2 tabels: ass2pp4.sty.
LA FRANCA, Fabio, Cristiani S.
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