Results 101 to 110 of about 458,069 (259)
Bias in C IV-based quasar black hole mass scaling relationships from reverberation mapped samples [PDF]
arXiv, 2015 The masses of the black holes powering quasars represent a fundamental parameter of active galaxies. Estimates of quasar black hole masses using single-epoch spectra are quite uncertain, and require quantitative improvement. We recently identified a correction for C IV $\lambda$1549-based scaling relationships used to estimate quasar black hole masses ...
arxiv
NGC 2579 and the carbon and oxygen abundance gradients beyond the solar circle [PDF]
, 2013 We present deep echelle spectrophotometry of the Galactic HII region NGC 2579. The data have been taken with the Very Large Telescope Ultraviolet-Visual Echelle Spectrograph in the 3550--10400 \AA\ range. This object, which has been largely neglected, shows however a rather high surface brightness, a high ionization degree and is located at a ...
arxiv +1 more source
A spectrophotometric study of blood group A-specific substance isolated from hog gastric mucosa [PDF]
, 1948 A study of the ultraviolet absorption spectra of preparations of blood group A-specific substance isolated from hog gastric mucin supports the view that group A substance, and probably group O substance, has little specific absorption in this spectral ...
Holzman, George, Niemann, Carl
core
Voyager Ultraviolet Spectrometers calibration and the heliosphere neutrals composition: reassessment [PDF]
arXiv, 2016 The Voyagers (V) 1 and 2 Ultraviolet Spectrometers (UVS) data harvest covers outer planets encounters, heliosphere sky-background measurements, and stellar spectrophotometry. Because their operation period overlaps with many ultraviolet missions, the V1 and V2 UVS calibration with other spectrometers are invaluable.
arxiv
An Atlas of Galaxy Spectral Energy Distributions from the Ultraviolet to the Mid-Infrared [PDF]
, 2013 We present an atlas of 129 spectral energy distributions for nearby galaxies, with wavelength coverage spanning from the UV to the mid-infrared. Our atlas spans a broad range of galaxy types, including ellipticals, spirals, merging galaxies, blue compact dwarfs and luminous infrared galaxies.
arxiv +1 more source
Improved ultraviolet spectrophotometry of serum theophylline.
Clinical Chemistry, 1978 Abstract We present an improved method for ultraviolet spectrophotometry of theophylline in serum. We studied various extraction techniques aimed at eliminating interferences from co-extractable serum constituents. In the resulting modified procedure, 1 ml of serum is required and a salt-solvent pair of ammonium sulfate and chloroform ...
K Blum, P Carter, J E Wallace
openaire +3 more sources
Carbon abundances and radial gradients in NGC300 and other nearby spiral galaxies [PDF]
arXiv, 2014 We present preliminary results of deep echelle spectrophotometry of a sample of HII regions along the disk of the Scd galaxy NGC300 obtained with the Ultraviolet and Visual Echelle Spectrograph (UVES) at the Very Large Telescope (VLT) with the aim of detect and measure very faint OII and CII permitted lines.
arxiv
Ultraviolet ISM Diagnostics for Star-Forming Galaxies I. Tracers of Metallicity and Extinction [PDF]
, 2015 We have observed a sample of 14 nearby ($z \sim 0.03$) star-forming blue compact galaxies in the rest-frame far-UV ($\sim1150-2200 \AA$) using the Cosmic Origins Spectrograph on the Hubble Space Telescope. We have also generated a grid of stellar population synthesis models using the Starburst99 evolutionary synthesis code, allowing us to compare ...
arxiv +1 more source
A Study of the Near-Ultraviolet Spectrum of Vega
, 2005 UV, optical, and near-IR spectra of Vega have been combined to test our understanding of stellar atmospheric opacities, and to examine the possibility of constraining chemical abundances from low-resolution UV fluxes.
Alejandro Garcia‐Gil +21 more
core +2 more sources
Green Chemistry Letters and Reviews, 2020 The biogenic synthesis of silver nanoparticles (AgNPs) using Aloe fleurentiniorum extract and antibacterial activity of the synthesized AgNPs were investigated.
Saleh H. Salmen, Sulaiman Ali Alharbi
doaj +1 more source