Results 121 to 130 of about 111,891 (295)

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, Wen Shi, Yifan Gou, Zihan Wang, Vivek S. Yedavalli, Doris D. Lin, Hanzhang Lu   +6 more
wiley   +1 more source

VODKA-JWST: Synchronized Growth of Two Supermassive Black Holes in a Massive Gas Disk? A 3.8 kpc Separation Dual Quasar at Cosmic Noon with the NIRSpec Integral Field Unit

The Astrophysical Journal
The search for dual supermassive black holes (SMBHs) is of immense interest in modern astrophysics. Galaxy mergers may fuel and produce SMBH pairs. Actively accreting SMBH pairs are observed as dual quasars, which are vital probes of SMBH growth.
Yuzo Ishikawa, Nadia L. Zakamska, Yue Shen, Xin Liu, Yu-Ching Chen, Hsiang-Chih Hwang, Andrey Vayner, David S. N. Rupke, Sylvain Veilleux, Dominika Wylezalek, Arran C. Gross, Swetha Sankar, Nadiia Diachenko   +12 more
doaj   +1 more source

Optical spectroscopy of faint gigahertz peaked spectrum sources [PDF]

, 1999
We present spectroscopic observations of a sample of faint Gigahertz Peaked Spectrum (GPS) radio sources drawn from the Westerbork Northern Sky Survey (WENSS). Redshifts have been determined for 19 (40%) of the objects.
A. G. de Bruyn, Baker, Baldwin, Baldwin, De Vries, Dressler, Fanti, Fanti, G. K. Miley, H. J. A. Röttgering, Hook, I. A. G. Snellen, Kinney, Lawrence, M. N. Bremer, Mushotzky, O'dea, O'dea, O'dea, O'dea, O'dea, Osmer, Osterbrock, Owsianik, R. T. Schilizzi, Readhead, Rengelink, Snellen, Snellen, Snellen, Snellen, Snellen, Snellen, Stanghellini, Stanghellini, Wilkes, Wills, Worthey   +37 more
core   +4 more sources

A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies. I. Galaxy Mergers and Quasar Activity [PDF]

, 2007
We develop a model for the cosmological role of mergers in the evolution of starbursts, quasars, and spheroidal galaxies. By combining theoretically well-constrained halo and subhalo mass functions as a function of redshift and environment with empirical
P. Hopkins, L. Hernquist, T. J. Cox, D. Keres̆   +3 more
semanticscholar   +1 more source

Dust Emission in an Accretion-rate-limited Sample of z ≳ 6 Quasars [PDF]

Astrophysical Journal, 2018
We present Atacama Large Millimeter Array 1 mm observations of the rest-frame far-infrared (FIR) dust continuum in 27 quasars at redshifts 6.0 ≲ z < 6.7.
B. Venemans, R. Decarli, F. Walter, E. Bañados, F. Bertoldi, Xiaohui Fan, E. Farina, C. Mazzucchelli, D. Riechers, H. Rix, Ran Wang, Yujin Yang   +11 more
semanticscholar   +1 more source

Machine Learning–Driven Near‐ and Mid‐Infrared Chemometrics for Rapid, Cost‐Effective COVID‐19 Screening in Dried Plasma

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, Wilson J. Cardoso, Luiz F. P. Ramos, Túlio R. Freitas, Priscilla S. Filgueiras, Rafaella F. Q. Grenfell, Reinaldo F. Teófilo, Adriano de Paula Sabino   +7 more
wiley   +1 more source

Quasars at 25

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

Localized Energy Absorption through LaB6 Surface Modification of PA12 Enables Enhanced Tensile Performance in Diode Laser PBF‐LB

Chemistry–Methods, Volume 5, Issue 12, November 2025.
LaB6 surface modification of PA12 enables efficient NIR diode laser PBF‐LB processing, with enhanced tensile strength and tailored microstructures achieved at minimal additionaly energy. By reducing the need for high filler content, this approach expands the options and performance levels of advanced industrial‐grade polymer additive manufacturing. The
Nadine Stratmann, Michael Willeke, Simon Leupold, Kateryna Loza, Arne Lüddecke, Arno Kwade, Michael Schmidt, Stephan Barcikowski, Anna Rosa Ziefuss   +8 more
wiley   +1 more source

Quasars in the 2MASS Second Incremental Data Release

, 2001
Using the 2MASS Second Incremental Data Release, we have searched for near infrared counterparts to 13214 quasars from the Veron-Cetty & Veron(2000) catalog.
Baker J., Francis P., Nelson B., Patrick B. Hall, Smith P. S., Veron-Cetty M. P., Wayne A. Barkhouse   +6 more
core   +3 more sources

Modeling Quasar UV/Optical Variability with the Corona-heated Accretion-disk Reprocessing (CHAR) Model [PDF]

, 2020
Mouyuan Sun, Yongquan Xue, Hengxiao Guo, Junxian Wang, W. N. Brandt, Jonathan R. Trump, Zhicheng He, Tong Liu, Jianfeng Wu, Haikun Li   +9 more
openalex   +1 more source