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567 Matching 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
Observation of e^+e^- to \rho^+\rho^- near \sqrt{s}=10.58\gev
The authors report the first observation of e{sup +}e{sup -} {yields} {rho}{sup +}{rho}{sup -}, in a data sample of 379 fb{sup -1} collected with the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring at center-of-mass energies near {radical}s = 10.58 GeV. The authors measure a cross section of {sigma}(e{sup +}e{sup -} {yields} {rho}{sup +}{rho}{sup -}) = 19.5 {+-} 1.6(stat) {+-} 3.2(syst) fb. Assuming production through single-photon annihilation, there are three independent helicity amplitudes. They measure the ratios of their squared moduli to be |F{sub 00}|{sup 2} : |F{sub 10}|{sup 2} : |F{sub 11}|{sup 2} = 0.51 {+-} 0.14(stat) {+-} 0.07(syst) : 0.10 {+-} 0.04(stat) {+-} 0.01(syst) : 0.04 {+-} 0.03(stat) {+-} 0.01(syst). The |F{sub 00}|{sup 2} result is inconsistent with the prediction of 1.0 made by QCD models with a significance of 3.1 standard deviations including systematic uncertainties.
Date:
June 26, 2008
Creator:
Aubert, B.; Bona, M.; Karyotakis, Y.; Lees, J. P.; Poireau, V.; Prencipe, E. et al.
Object Type:
Article
System:
The UNT Digital Library
Iron-Based Amorphous Coatings Produced by HVOF Thermal Spray Processing-Coating Structure and Properties
The feasibility to coat large SNF/HLW containers with a structurally amorphous material (SAM) was demonstrated on sub-scale models fabricated from Type 316L stainless steel. The sub-scale model were coated with SAM 1651 material using kerosene high velocity oxygen fuel (HVOF) torch to thicknesses ranging from 1 mm to 2 mm. The process parameters such as standoff distance, oxygen flow, and kerosene flow, were optimized in order to improve the corrosion properties of the coatings. Testing in an electrochemical cell and long-term exposure to a salt spray environment were used to guide the selection of process parameters.
Date:
March 26, 2008
Creator:
Beardsley, M B
Object Type:
Article
System:
The UNT Digital Library
Food and Agricultural Imports from China
This report first provides information on the most recent Chinese-related food safety concern, the use of melamine in dairy ingredients. Following this section, the report provides data on U.S.-China trends in agricultural trade, examines U.S. programs to monitor the safety of imports, and reports on other recent Chinese food safety developments. It concludes with a brief discussion of the congressional role.
Date:
September 26, 2008
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
Temporary Restoration of Bull Trout Passage at Albeni Falls Dam, 2007 Progress Report.
None
Date:
January 26, 2008
Creator:
Bellgraph, Brian J. & Deters, Katherine A.
Object Type:
Report
System:
The UNT Digital Library
Bills and Resolutions: Examples of How Each Kind is Used
This report provides background information regarding the bill and joint resolution, which must be passed by both houses in identical form, then presented to the President for his approval or disapproval.
Date:
November 26, 2008
Creator:
Beth, Richard S.
Object Type:
Report
System:
The UNT Digital Library
Bills, Resolutions, Nominations, and Treaties: Characteristics, Requirements, and Uses
This report gives information about characteristics, requirements, and uses of Bills, Resolutions, Nominations, and Treaties.
Date:
November 26, 2008
Creator:
Beth, Richard S.
Object Type:
Report
System:
The UNT Digital Library
The Discharge Rule in the House: Principal Features and Uses
This report provides information about the Principal Features and Uses on Discharge Rule in the House. The discharge rule allows a measure to come to the floor of considerationeven if the committee of referral does not report it and the leadership does not schedule it.
Date:
November 26, 2008
Creator:
Beth, Richard S.
Object Type:
Report
System:
The UNT Digital Library
Nuclear Cooperation Agreement with Russia: Statutory Procedures for Congressional Consideration and Their Implementation
This report sketches the procedures prescribed by the Atomic Energy Act (AEA) for congressional action in relation to agreements of this kind.
Date:
November 26, 2008
Creator:
Beth, Richard S.
Object Type:
Report
System:
The UNT Digital Library
Federal Debt Management: Concepts, Options, and Policies (1945-2008). September 2008
This report provides a broad overview of Treasury debt management and examines changes in debt sales implemented by the Clinton and Bush Administrations.
Date:
September 26, 2008
Creator:
Bickley, James M.
Object Type:
Report
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 114, No. 38, Ed. 1 Wednesday, March 26, 2008
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
March 26, 2008
Creator:
Bridges, Steven W.
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 115, No. 21, Ed. 1 Wednesday, November 26, 2008
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
November 26, 2008
Creator:
Bridges, Steven W.
Object Type:
Newspaper
System:
The Portal to Texas History
Perry Daily Journal (Perry, Okla.), Vol. 116, No. 19, Ed. 1 Saturday, January 26, 2008
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 26, 2008
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 116, No. 40, Ed. 1 Tuesday, February 26, 2008
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 26, 2008
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 116, No. 60, Ed. 1 Wednesday, March 26, 2008
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 26, 2008
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 116, No. 82, Ed. 1 Saturday, April 26, 2008
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 26, 2008
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 116, No. 124, Ed. 1 Thursday, June 26, 2008
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 26, 2008
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 116, No. 147, Ed. 1 Saturday, July 26, 2008
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 26, 2008
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 116, No. 166, Ed. 1 Tuesday, August 26, 2008
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 26, 2008
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History