Results 1 to 10 of about 58,921 (147)

Synchrotron macro-ATR-FTIR: a powerful technique for analyzing changes in plant cell chemical composition after surfactant exposure. [PDF]

Plant J
Significance Statement Studies on how surfactants affect plant leaf surfaces mainly focus on droplet behavior, while their impact on leaf chemistry remains unclear. Using synchrotron macro‐ATR‐FTIR, we provide a fast and non‐destructive advanced method for leaf surface analysis and chemical mapping.
Tran TLC, Klein AR, Vongsvivut J, Wang Y, Kong L, Yang W, Cahill D.   +6 more
europepmc   +2 more sources

Characterization of an MR-compatible motion platform for quality assurance of motion-compensated treatments on the 1.5 T MR-linac. [PDF]

Med Phys
Abstract Background Novel motion‐compensated treatment techniques on the MR‐linac can address adverse intra‐fraction motion effects. These techniques involve beam gating or intra‐fraction adaptations of the treatment plan based on real‐time magnetic resonance imaging (MRI) performed during treatment.
Oolbekkink S, Borman PTS, Wolthaus JWH, van Asselen B, van Lier ALHMW, Dunn S, Koenig GR, Hartman N, Kheirkhah N, Raaymakers BW, Fast MF.   +10 more
europepmc   +2 more sources

Discovery of spectacular quasar-driven superbubbles in red quasars. [PDF]

Sci Adv, 2023
Quasar-driven outflows on galactic scales are a routinely invoked ingredient for galaxy formation models. We report the discovery of ionized gas nebulae surrounding three luminous red quasars at z ~ 0.4 from Gemini integral field unit observations.
Shen L, Liu G, He Z, Zakamska NL, Glikman E, Greene JE, Hu W, Mou G, Wylezalek D, Rupke DSN.   +9 more
europepmc   +4 more sources

Commissioning of a motion management system for a 1.5T Elekta Unity MR-Linac: A single institution experience. [PDF]

J Appl Clin Med Phys
Abstract Purpose This work describes a single institution experience of commissioning a real‐time target tracking and beam control system, known as comprehensive motion management, for a 1.5 T Elekta MR‐Linac. Methods Anatomical tracking and radiation beam control were tested using the MRI4D Quasar motion phantom.
Smith BR, St-Aubin J, Hyer DE.
europepmc   +2 more sources

Quantifying the dosimetric accuracy of expiration-gated stereotactic lung radiotherapy. [PDF]

Med Phys
Abstract Background In stereotactic body radiotherapy, a form of motion management is often applied to mobile lung tumors. Gated radiotherapy is such form of motion management in which the radiation beam is switched on or off depending on the actual tumor position.
Hoffmans D, Remmerts de Vries I, Dahele M, Verbakel W.   +3 more
europepmc   +2 more sources

Quasar Clustering and the Lifetime of Quasars [PDF]

The Astrophysical Journal, 2001
ApJ Accepted (Feb 2001). 30 pages, 8 embedded ps figures, AASTEX5. Added discussion of quasar luminosity evolution. Also available at http://www.ociw.edu/~martini/pubs/
Paul Martini, Paul Martini, David H. Weinberg   +2 more
openaire   +4 more sources

Quasars Probing Quasars. X. The Quasar Pair Spectral Database [PDF]

The Astrophysical Journal Supplement Series, 2018
Abstract The rare close projection of two quasars on the sky provides the opportunity to study the host galaxy environment of a foreground quasar in absorption against the continuum emission of a background quasar. For over a decade the “Quasars probing quasars” series has utilized this technique to further the understanding of galaxy ...
J. Xavier Prochaska, B. Chehade, Stephanie Bartle, M. A. DiPompeo, Joseph R. Findlay, Tom Shanks, Michele Fumagalli, Joseph F. Hennawi, Joseph F. Hennawi, Adam D. Myers, Marie Wingyee Lau, Kate H. R. Rubin   +11 more
openaire   +8 more sources

Binary quasars [PDF]

Monthly Notices of the Royal Astronomical Society, 1999
Quasar pairs are either physically distinct binary quasars or the result of gravitational lensing. The majority of known pairs are in fact lenses, with a few confirmed as binaries, leaving a population of objects that have not yet been successfully classified.
Mortlock, D, Webster, Rachel L, Francis, Paul   +2 more
openaire   +5 more sources

THE PROPERTIES OF QUASAR HOSTS AT THE PEAK OF THE QUASAR ACTIVITY [PDF]

The Astrophysical Journal, 2009
We present near-infrared imaging obtained with ESO VLT/ISAAC of a sample of 16 low luminosity radio-quiet quasars at the epoch around the peak of the quasar activity (2 < z < 3), aimed at investigating their host galaxies. For 11 quasars, we are able to detect the host galaxies and derive their properties, while for the other five quasars, upper ...
Kotilainen J. K., Falomo R., Decarli R., TREVES, ALDO, Uslenghi M., Scarpa R.   +5 more
openaire   +5 more sources

The Reddest Quasars [PDF]

The Astrophysical Journal, 2002
In a survey of quasar candidates selected by matching the FIRST and 2MASS catalogs, we have found two extraordinarily red quasars. FIRST J013435.7-093102 is a 1 Jy source at z=2.216 and has B-K > 10, while FIRST J073820.1+275045 is a 2.5 mJy source at z=1.985 with B-K = 8.4.
Mark Lacy, Mark Lacy, Richard L. White, Michael D. Gregg, Michael D. Gregg, David J. Helfand, Robert H. Becker, Robert H. Becker, Michael S. Brotherton, Eilat Glikman   +9 more
openaire   +3 more sources