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UNT Libraries Government Documents Department
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213
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137
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34
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12
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8
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5
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5
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4
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4
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Jim Argo Collection
171
Congressional Research Service Reports
139
Texas Digital Newspaper Program
115
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84
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76
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48
Tocker Foundation Grant
33
Government Accountability Office Reports
32
University Photography Collection
32
Photographing UNT
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Results:
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Reduction of pertechnetate by acetohydroxamic acid: Formation of [TcNO(AHA)2(H2O)]+ and implications for the UREX process.
Reductive nitrosylation and complexation of ammonium pertechnetate by acetohydroxamic acid has been achieved in aqueous nitric and perchloric acid solutions. The kinetics of the reaction depend on the relative concentrations of the reaction components and are accelerated at higher temperatures. The reaction does not occur unless conditions are acidic. Analysis of the x-ray absorption fine structure spectroscopic data is consistent with a pseudo-octahedral geometry with the linear Tc-N-O bond typical of technetium nitrosyl compounds, and electron spin resonance spectroscopy is consistent with a the d{sup 5} Tc(II) nitrosyl complex. The nitrosyl source is generally AHA, but may be augmented by products of reaction with nitric acid. The resulting low-valency trans-aquonitrosyl(diacetohydroxamic)-technetium(II) complex (1) is highly soluble in water, extremely hydrophilic, and is not extracted by tri-n-butylphosphate in a dodecane diluent. Its extraction properties are not pH-dependent; titration studies indicate a single species from pH 4.5 down to -0.6 (calculated). This molecule is resistant to oxidation by H{sub 2}O{sub 2}, even at high pH, and can undergo substitution to form other technetium nitrosyl complexes. The formation of 1 may strongly impact the fate of technetium in the nuclear fuel cycle.
Date:
February 26, 2008
Creator:
1Harry Reid Center for Environmental Studies, Nuclear Science and Technology Division, University of Nevada, Las Vegas, Las Vegas, NV, 89154-4006; Gong, Cynthia-May S; Poineau, Frederic; Lukens, Wayne W & Czerwinski, Kenneth R.
Object Type:
Article
System:
The UNT Digital Library
Structure of the Lithosphere and Upper Mantle Across the Arabian Peninsula
None
Date:
August 26, 2008
Creator:
Al-Amri, A.; Rodgers, A.; Hansen, S.; Nyblade, A.; Park, Y. & Tkalcic, H.
Object Type:
Article
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 26, Ed. 1 Thursday, June 26, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
June 26, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
The Senate Select Committee on Ethics: A Brief History of Its Evolution and Jurisdiction
None
Date:
March 26, 2008
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Women in the United States Congress: 1917-2008
None
Date:
November 26, 2008
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Technical Letter Report - Analysis of Ultrasonic Data on Piping Cracks at Ignalina Nuclear Power Plant Before and After Applying a Mechanical Stress Improvement Process, JCN-N6319, Task 2
Pacific Northwest National Laboratory (PNNL) is assisting the United States Nuclear Regulatory Commission (NRC) in developing a position on the management of primary water stress corrosion cracking (PWSCC) in piping systems previously analyzed for leak-before-break (LBB). Part of this work involves determining whether inspections alone are sufficient or if inspections plus mitigation techniques are needed. The work described in this report addresses the reliability of ultrasonic phased-array (PA) examinations for inspection of cracks that have been subjected to the mitigation method of mechanical stress improvement process (MSIP). It is believed that stresses imparted during MSIP may make ultrasonic crack responses in piping welds more difficult to detect and accurately characterize. To explore this issue, data were acquired, both before and after applying MSIP, and analyzed from cracked areas in piping at the Ignalina Nuclear Power Plant (INPP) in Lithuania. This work was performed under NRC Project JCN-N6319, PWSCC in Leak-Before-Break Systems.
Date:
February 26, 2008
Creator:
Anderson, Michael T.; Cumblidge, Stephen E. & Crawford, Susan L.
Object Type:
Report
System:
The UNT Digital Library
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Standing Bear Museum and Education Center
Photograph of a scene at the Standing Bear Museum and Education Center.
Date:
July 26, 2008
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History