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The Ultraviolet-To-Mid-Infrared Spectral Energy Distribution of Weak Emission Line Quasars
This article presents Spitzer Space Telescope photometry of 18 Sloan Digital Sky Survey quasars which have weak or undetectable high-ionization emission lines in their rest-frame ultraviolet spectra.
Date:
September 23, 2011
Creator:
Lane, Ryan A.; Shemmer, Ohad; Diamond-Stanic, Aleksandar M.; Fan, Xiaohui; Anderson, Scott F.; Brandt, William Nielsen et al.
Object Type:
Article
System:
The UNT Digital Library
Free-Text Collection-Level Metadata in Large-Scale Digital Libraries: A Comparative Content Analysis [Presentation]
This presentation includes audio/video media and discusses metadata. This presentation reports results of the study that used an in-depth comparative content analysis to assess free-text collection-level subject metadata in three large-scale digital cultural heritage aggregations in the United States and Europe.
Date:
September 23, 2011
Creator:
Zavalina, Oksana
Object Type:
Video
System:
The UNT Digital Library