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Influence of shockwave obliquity on deformation twin formation in Ta
Energetic loading subjects a material to a 'Taylor wave' (triangular wave) loading profile that experiences an evolving balance of hydrostatic (spherical) and deviatoric stresses. While much has been learned over the past five decades concerning the propensity of deformation twinning in samples shockloaded using 'square-topped' profiles as a function of peak stress, achieved most commonly via flyer plate loading, less is known concerning twinning propensity during non-I-dimensional sweeping detonation wave loading. Systematic small-scale energetically-driven shock loading experiments were conducted on Ta samples shock loaded with PEFN that was edge detonated. Deformation twinning was quantified in post-mortem samples as a function of detonation geometry and radial position. In the edge detonated loading geometry examined in this paper, the average volume fraction of deformation twins was observed to drastically increase with increasing shock obliquity. The results of this study are discussed in light of the formation mechanisms of deformation twins, previous literature studies of twinning in shocked materials, and modeling of the effects of shock obliquity on the evolution of the stress tensor during shock loading.
Date:
January 1, 2009
Creator:
Gray, George T., III; Livescu, V.; Cerreta, E. K.; Mason, T. A.; Maudlin, P. J. & Bingert, J. F.
Object Type:
Article
System:
The UNT Digital Library
Remote Detection of Radioactive Plumes Using Millimeter Wave Technology
The reprocessing of spent nuclear fuel, a common method for manufacturing weapons-grade special nuclear materials, is accompanied by the release of fi ssion products trapped within the fuel. One of these fi ssion products is a radioactive isotope of Krypton (Kr-85); a pure β- emitter with a half-life of 10.72 years. Due to its chemical neutrality and relatively long half life, nearly all of the Kr-85 is released into the surrounding air during reprocessing, resulting in a concentration of Kr-85 near the source that is several orders of magnitude higher than the typical background (atmospheric) concentrations. This high concentration of Kr-85 is accompanied by a proportionately high increase in air ionization due to the release of beta radiation from Kr-85 decay. Millimeter wave (MMW) sensing technology can be used to detect the presence of Kr-85 induced plumes since a high concentration of ions in the air increases the radar cross section due to a combination of atmospheric phenomena. Possible applications for this technology include the remote sensing of reprocessing activities across national borders bolstering global anti-proliferation initiatives. The feasibility of using MMW radar technology to uniquely detect the presence of Kr-85 can be tested using commercial ion generators or sealed …
Date:
January 1, 2009
Creator:
Barnowski, Ross; Chien, Haul-Te & Gopalsami, Nachappa
Object Type:
Article
System:
The UNT Digital Library
An Analysis of Testing Requirements for Fluoride Salt Cooled High Temperature Reactor Components
This report provides guidance on the component testing necessary during the next phase of fluoride salt-cooled high temperature reactor (FHR) development. In particular, the report identifies and describes the reactor component performance and reliability requirements, provides an overview of what information is necessary to provide assurance that components will adequately achieve the requirements, and then provides guidance on how the required performance information can efficiently be obtained. The report includes a system description of a representative test scale FHR reactor. The reactor parameters presented in this report should only be considered as placeholder values until an FHR test scale reactor design is completed. The report focus is bounded at the interface between and the reactor primary coolant salt and the fuel and the gas supply and return to the Brayton cycle power conversion system. The analysis is limited to component level testing and does not address system level testing issues. Further, the report is oriented as a bottom-up testing requirements analysis as opposed to a having a top-down facility description focus.
Date:
November 1, 2009
Creator:
Holcomb, David Eugene; Cetiner, Mustafa Sacit; Flanagan, George F; Peretz, Fred J & Yoder, Graydon L., Jr.
Object Type:
Report
System:
The UNT Digital Library
Terrestrial Carbon Sequestration - Science for Enhancement and Implementation
It is time to re-evaluate all available options that might not be permanent yet have the potential to buy time, bridging to a future when new energy system technologies and a transformed energy infrastructure can fully address the climate challenge. Terrestrial sequestration is one option large enough to make a contribution in the coming decades using proven land management methods and with the possibility that new technologies could significantly enhance the opportunity. Here we review progress on key scientific, economic, and social issues; postulate the extent to which new technologies might significantly enhance terrestrial sequestration potential; and address remaining research needs.
Date:
January 1, 2009
Creator:
Post, Wilfred M; Amonette, James; Birdsey, Richard A.; Garten Jr, Charles T; Graham, Robin Lambert; Izaurralde, Dr. R. Cesar et al.
Object Type:
Book
System:
The UNT Digital Library
Perry Daily Journal (Perry, Okla.), Vol. 117, No. 233, Ed. 1 Tuesday, December 1, 2009
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 1, 2009
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 117, No. 64, Ed. 1 Wednesday, April 1, 2009
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 1, 2009
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 117, No. 86, Ed. 1 Friday, May 1, 2009
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 1, 2009
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Oral History Interview with Jonathan Forbes, December 1, 2009
Access:
Use of this item is restricted to the UNT Community
Interview with Jonathan Forbes, Canadian-born immigrant to Plano, Texas, as part of the DFW Metroplex Immigrants Oral History Project. The interview includes Forbes' personal experiences of childhood and education in Halifax, Nova Scotia, and dealing with the U.S. immigration and customs bureaucracy. Forbes also talks about his parent's decision to immigrate to the U.S., the similarities and differences of life in Canada and the U.S., his perception of changes due to 9/11 attacks, his intention to remain in the U.S. and gain citizenship, and views on contemporary political issues.
Date:
December 1, 2009
Creator:
Truxal, Luke & Forbes, Jonathan
Object Type:
Book
System:
The UNT Digital Library
Oral History Interview with Gudrun Raschen, November 1, 2009
Access:
Use of this item is restricted to the UNT Community
Transcript of an interview with Gudrun Raschen, a German-born immigrant to Denton, Texas, and adjunct professor of Music at Texas Woman's University. Raschen shares concerning her childhood, and education in Kiel and Hamburg, Germany; family history; parents' move to South Africa; own move to South Africa; discovery of the cello and decision to study it seriously; involvement in anti-apartheid movement; decision to move to the U.S. for graduate school; attraction of UNT Doctorate of Musical Arts program; first impressions of the U.S. and of Denton; comparison and contrast of life in Germany, South Africa, and the U.S.; plans for the future.
Date:
November 1, 2009
Creator:
Schnur, Abra & Raschen, Gudrun
Object Type:
Book
System:
The UNT Digital Library
Garber Billings News (Garber, Okla.), Vol. 109, No. 48, Ed. 1 Thursday, October 1, 2009
Weekly newspaper from Garber, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 1, 2009
Creator:
Hogan, Vickie Lee
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 117, No. 172, Ed. 1 Tuesday, September 1, 2009
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 1, 2009
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 117, No. 193, Ed. 1 Thursday, October 1, 2009
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 1, 2009
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 117, No. 129, Ed. 1 Wednesday, July 1, 2009
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 1, 2009
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 117, No. 151, Ed. 1 Saturday, August 1, 2009
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 1, 2009
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Mercedes Enterprise (Mercedes, Tex.), Vol. 101, No. 13, Ed. 1 Wednesday, April 1, 2009
Weekly newspaper from Mercedes, Texas that includes local, state, and national news along with advertising.
Date:
April 1, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Mercedes Enterprise (Mercedes, Tex.), Vol. 101, No. 26, Ed. 1 Wednesday, July 1, 2009
Weekly newspaper from Mercedes, Texas that includes local, state, and national news along with advertising.
Date:
July 1, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 103, No. 70, Ed. 1 Tuesday, September 1, 2009
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
September 1, 2009
Creator:
Cartwright, Brian & Velvin, Candace E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 103, No. 96, Ed. 1 Tuesday, December 1, 2009
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
December 1, 2009
Creator:
Cartwright, Brian & Velvin, Candace E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 103, No. 35, Ed. 1 Friday, May 1, 2009
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
May 1, 2009
Creator:
Cartwright, Brian & Velvin, Candace E.
Object Type:
Newspaper
System:
The Portal to Texas History
Brady Standard-Herald and Heart of Texas News (Brady, Tex.), Ed. 1 Wednesday, April 1, 2009
Weekly newspaper from Brady, Texas that includes local, state, and national news along with advertising.
Date:
April 1, 2009
Creator:
Stewart, James E.
Object Type:
Newspaper
System:
The Portal to Texas History
Brady Standard-Herald and Heart of Texas News (Brady, Tex.), Ed. 1 Wednesday, July 1, 2009
Weekly newspaper from Brady, Texas that includes local, state, and national news along with advertising.
Date:
July 1, 2009
Creator:
Stewart, James E.
Object Type:
Newspaper
System:
The Portal to Texas History
Lexington Leader (Lexington, Tex.), Vol. 13, No. 597, Ed. 1 Thursday, October 1, 2009
Weekly newspaper from Lexington, Texas that includes local, state, and national news along with advertising.
Date:
October 1, 2009
Creator:
Terrell, Cindy
Object Type:
Newspaper
System:
The Portal to Texas History
Citizens' Advocate (Coppell, Tex.), Vol. 25, No. 18, Ed. 1 Friday, May 1, 2009
Weekly newspaper from Coppell, Texas that includes local, state, and national news along with advertising.
Date:
May 1, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History