Results 91 to 100 of about 83,297 (253)
Business Strategy and the Environment, Volume 35, Issue 1, Page 593-614, January 2026.ABSTRACT The circular economy is an approach to decouple economic growth from environmental impacts. In Europe, its development is driven by policies that guide market dynamics through regulations and by businesses innovating with new circular models.
Roger Nyffenegger +3 more
wiley +1 more source
A companion to a quasar at redshift 4.7 [PDF]
, 1996 There is a growing consensus that the emergence of quasars at high redshifts is related to the onset of galaxy formation, suggesting that the detection of concentrations of gas accompanying such quasars should provide clues about the early history of ...
AM Wolfe +27 more
core +2 more sources
A CSF Background Suppression Scheme in Arterial Spin Labeling MRI
NMR in Biomedicine, Volume 39, Issue 1, January 2026.Arterial spin labeling MRI suffers from signal instability due to CSF pulsation, which are not fully addressed by conventional tissue‐focused background suppression (BS). We developed a CSF BS scheme and demonstrated its advantages in both single‐ and multi‐delay ASL.
Zhiyi Hu +6 more
wiley +1 more source
Science, 1986 In the quarter century since the first optical identification of a "radio star" (3C 48), astronomers have come to general agreement that the underlying quasar energy source is accretion onto a massive black hole. There is much less agreement on the detailed physics of the processes by which this energy is converted to the forms observed, but this has ...
Trimble, Virginia, Woltjer, Lodewijk
openaire +4 more sources
SDSS J131339.98+515128.3: A new gravitationally lensed quasar selected based on near-infrared excess [PDF]
, 2007 We report the discovery of a new gravitationally lensed quasar, SDSS J131339.98+515128.3, at a redshift of 1.875 with an image separation of 1.24". The lensing galaxy is clearly detected in visible-light follow-up observations.
Inada, N. +4 more
core +5 more sources
Cherenkov Telescope Array Observatory: Die Zukunft der Gammaastronomie
Physik in unserer Zeit, Volume 57, Issue 1, Page 10-18, January 2026.Im Jahr 1989 hat das Wipple‐Observatorium die erste Quelle hochenergetischer Gammastrahlung entdeckt. 2002 waren dann sechs Quellen bekannt, 2024 schon mehr als 300. Und das ist immer noch lediglich die Spitze des Eisbergs in der jungen Geschichte der Gammaastronomie.
Daniela Hadasch, Daniel Mazin
wiley +1 more source
Discovery of a Radio-loud/Radio-quiet Binary Quasar [PDF]
, 1999 We report the discovery of a small separation quasar pair (z=0.586, O=18.4, 19.2, sep. = 2.3 arcsec) associated with the radio source FIRST J164311.3+315618 (S_1400 = 120 mJy).
Jackson N. +6 more
core +2 more sources
The Astrophysical JournalQuasars could serve as standard candles if the relation between their ultraviolet (UV) and X-ray luminosities can be accurately calibrated. Previously, we developed a model-independent method to calibrate quasar standard candles using the distance ...
Xiaolei Li +2 more
doaj +1 more source
Journal of Chemometrics, Volume 39, Issue 12, December 2025.ABSTRACT The COVID‐19 pandemic has highlighted the urgent need for rapid, accurate, and cost‐effective diagnostic alternatives to conventional methods such as RT‐qPCR and immunoassays. In this study, we explored the potential of vibrational spectroscopy, specifically near‐infrared (NIR) and mid‐infrared (MID) spectroscopy, for detecting SARS‐CoV‐2 ...
Fernanda F. S. Oliveira +7 more
wiley +1 more source
Effects of Biases in Virial Mass Estimation on Cosmic Synchronization of Quasar Accretion
, 2011 Recent work using virial mass estimates and the quasar mass-luminosity plane has yielded several new puzzles regarding quasar accretion, including a sub-Eddington boundary on most quasar accretion, near-independence of the accretion rate from properties ...
Begelman +27 more
core +1 more source