Results 71 to 80 of about 150,777 (255)
Planta Daninha, 2007 Objetivou-se com este trabalho verificar a quebra de dormência, utilizando ácido sulfúrico (H2SO4) e escarificação mecânica, e o efeito da luz na germinação das espécies Euphorbia heterophylla, Ipomoea nil, Sida glaziovii e Brachiaria plantaginea.
F.L. Salvador +4 more
doaj +1 more source
Energies, 2023 To restrain the environmental impact of modern SI engines, igniters must guarantee stable combustions with low cycle-to-cycle variability in extreme operating conditions (high EGR, ultra-lean), via high energy release in the combustion chamber.
Roberto Martinelli +5 more
doaj +1 more source
Letter: Note on the Luminosity Distance [PDF]
General Relativity and Gravitation, 2004 We re-derive a formula relating the areal and luminosity distances, entirely in the framework of the classical Maxwell theory, assuming a geometric-optics type condition.
Grzegorz Wyleżek +2 more
openaire +4 more sources
TOWARD THE STANDARD POPULATION SYNTHESIS MODEL OF THE X-RAY BACKGROUND: EVOLUTION OF X-RAY LUMINOSITY AND ABSORPTION FUNCTIONS OF ACTIVE GALACTIC NUCLEI INCLUDING COMPTON-THICK POPULATIONS [PDF]
, 2014 We present the most up to date X-ray luminosity function (XLF) and absorption function of active galactic nuclei (AGNs) over the redshift range from 0 to 5, utilizing the largest, highly complete sample ever available obtained from surveys performed with
Y. Ueda +4 more
semanticscholar +1 more source
The bolometric luminosities of stars [PDF]
Symposium - International Astronomical Union, 1997 The total energy emitted by a star is one of its basic parameters. It is also one of the most difficult to determine, requiring space-based as well as ground-based measurements of the absolute flux from stars. We review the current status of these observations in the ultraviolet, visible, and near infrared, and estimate the uncertainties of the ...
Jeffrey W. Percival, Robert Bless
openaire +3 more sources
THE EVOLUTION OF THE GALAXY REST-FRAME ULTRAVIOLET LUMINOSITY FUNCTION OVER THE FIRST TWO BILLION YEARS [PDF]
, 2014 We present a robust measurement and analysis of the rest-frame ultraviolet (UV) luminosity functions at z = 4–8. We use deep Hubble Space Telescope imaging over the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey/GOODS fields, the Hubble ...
S. Finkelstein +28 more
semanticscholar +1 more source
Luminosity to the Eddington luminosity ratio in AGN
, 1996 LaTex file, uses epsfig, 4 pages, 5 Postscript figures, contribution to 2nd INTEGRAL Workshop, "The Transparent Universe", St.
Czerny, B., Witt, H. J., Zycki, P. T.
openaire +2 more sources
The cepheid luminosity scale [PDF]
Space Science Reviews, 1980 The distances of clusters containing classical Cepheids are central to the calibration of the period-luminosity relation. As a step in improving the reliability of the calibration, uvbys photometry was obtained for B stars in eight of these clusters. These data were then used to determine the distances of the clusters and, thus, the absolute magnitudes
openaire +4 more sources
A remarkably flat relationship between the average star formation rate and AGN luminosity for distant X-ray AGN. [PDF]
, 2015 In this study, we investigate the relationship between the star formation rate (SFR) and AGN luminosity (LAGNLAGN) for ∼2000 X-ray detected AGN.
F. Stanley +8 more
semanticscholar +1 more source
THE GALAXY UV LUMINOSITY FUNCTION BEFORE THE EPOCH OF REIONIZATION [PDF]
Proceedings of the International Astronomical Union, 2015 We present a model for the evolution of the galaxy ultraviolet (UV) luminosity function (LF) across cosmic time where star formation is linked to the assembly of dark matter halos under the assumption of a mass-dependent, but redshift-independent ...
C. Mason, M. Trenti, T. Treu
semanticscholar +1 more source