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An Extreme X-Ray Variability Event of a Weak-line Quasar
Article reports the discovery of an extreme X-ray flux rise (by a factor of ≳20) of the weak-line quasar Sloan Digital Sky Survey (SDSS) J153913.47+395423.4 (hereafter SDSS J1539+3954) at z = 1.935. SDSS J1539+3954 is the most-luminous object among radio-quiet type 1 active galactic nuclei (AGNs) where such dramatic X-ray variability has been observed.
Date:
February 3, 2020
Creator:
Ni, Q.; Brandt, W. N.; Yi, W.; Luo, B.; Timlin, J. D., III; Hall, P. B. et al.
System:
The UNT Digital Library
A Phosphonic Functionalized Biopolymer for the Sorption of Lanthanum (III) and Application in the Recovery of Rare Earth Elements
Authors of the article state that in the first step of their experiment, the sorption was investigated using La(III) ions before testing for the recovery of rare earth elements (REEs) from pretreated industrial acidic leachate. They infer that phosphonate groups participate in the sorption, and that the most effective sorption is at pH = 4.
Date:
February 3, 2023
Creator:
Hamza, Mohammed F.; Abdellah, Walid M.; Zaki, Doaa I.; Wei, Yuezhou; Althumayri, Khalid; Brostow, Witold, 1934- et al.
System:
The UNT Digital Library