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Numerical simulatin of supernova-relevant laser-driven hydro experiments on OMEGA
In ongoing experiments performed on the OMEGA laser [J. M. Soures et al., Phys. Plasmas 5, 2108 (1996)] at the University of Rochester Laboratory for Laser Energetics (LLE), nanosecond laser pulses are used to drive strong blast waves into two-layer targets. Perturbations on the interface between the two materials are unstable to the Richtmyer-Meshkov instability as a result of shock transit and the Rayleigh-Taylor instability during the deceleration-phase behind the shock front. These experiments are designed to produce a strongly shocked interface whose evolution is a scaled version of the unstable hydrogen-helium interface in core-collapse supernovae such as SN 1987A. The ultimate goal of this research is to develop an understanding of the effect of hydrodynamic instabilities and the resulting transition to turbulence on supernovae observables that remain as yet unexplained. The authors are, at present, particularly interested in the development of the Rayleigh-Taylor instability through the late nonlinear stage, the transition to turbulence, and the subsequent transport of material within the turbulent region. In this paper, the results of numerical simulations of 2D single and multimode experiments are presented. These simulations are run using the 2D Arbitrary Lagrangian Eulerian (ALE) radiation hydrodynamics code CALE [R. T. Barton, Numerical Astrophysics …
Date:
February 10, 2004
Creator:
Leibrandt, D; Robey, H F; Edwards, M J; Braun, D G; Miles, A R & Drake, R P
Object Type:
Article
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 87, No. 100, Ed. 1 Tuesday, February 10, 2004
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 10, 2004
Creator:
King, Christopher R.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 111, No. 27, Ed. 1 Tuesday, February 10, 2004
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 10, 2004
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Proposed Holistic Strategy for the Closure of F-Area, A Large Nuclear Industrial Complex at the Savannah River Site, South Carolina
F-Area is a large nuclear complex located near the center of the Department of Energy's (DOEs) Savannah River Site in South Carolina. The present closure strategy for F-Area is based on established SRS protocol for a site-specific, graded approach to deactivation and decommissioning. Uncontaminated facilities will be closed under the National Environmental Policy Act (NEPA). Facilities requiring removal or in-situ disposition of residual chemical and/or radiological inventories will be decommissioned under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). The F-Area Tank Farm, which is permitted under the Clean Water Act, will be closed in accordance with an industrial wastewater closure plan. F-Area closure will also involve the near- and long-term remediation of contaminated soil and groundwater resources. The proposed holistic F-Area closure strategy would enhance the existing project-specific SRS closure protocol by incorporating a comprehensive area-wide groundwater modeling tool, or Composite Analysis. The use of this methodology would allow for the assessment of the relative impacts of individual projects, as well as the cumulative effect of all F-Area closure actions, on area groundwater resources. Other critical elements of the proposed strategy include (i) the consistent use of site-specific Risk Assessments (RAs) and Performance Assessments (PAs), (ii) the closer …
Date:
February 10, 2004
Creator:
SHEDROW, CB
Object Type:
Article
System:
The UNT Digital Library
Rains County Leader (Emory, Tex.), Vol. 116, No. 35, Ed. 1 Tuesday, February 10, 2004
Weekly newspaper from Emory, Texas that includes local, state, and national news along with advertising.
Date:
February 10, 2004
Creator:
Hill, Earl Clyde, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 89, No. 130, Ed. 1 Tuesday, February 10, 2004
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 10, 2004
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Sealy News (Sealy, Tex.), Vol. 117, No. 12, Ed. 1 Tuesday, February 10, 2004
Semiweekly newspaper from Sealy, Texas that includes local, state, and national news along with advertising.
Date:
February 10, 2004
Creator:
Griffin, Joanie & Horecka, Bobby
Object Type:
Newspaper
System:
The Portal to Texas History
[Students around Sigma Lambda Beta table]
A photograph of students seated at the Sigma Lambda Beta table during a banquet sponsored by the UNT Multicultural Center. There are place settings, napkins, flowers, and a card with the fraternity's name on it.
Date:
February 10, 2004
Creator:
University of North Texas. Multicultural Center.
Object Type:
Photograph
System:
The UNT Digital Library
TPV Network Sensitivity: A Simulation Study
A viable thermophotovoltaic power conversion system requires an electrically connected network of diodes that is designed to be fault tolerant for a prescribed power rating and generator life. This paper describes simulation studies investigating the sensitivity of various series/parallel network configurations to diode variability. The results show the effect of diode mismatch and reverse breakdown behavior on network performance.
Date:
February 10, 2004
Creator:
Vell, J. L.; Oppenlander, J. E.; Gaes, W. S.; Siganporia, D. M. & Danielson, L. R.
Object Type:
Report
System:
The UNT Digital Library
U.S. Public Diplomacy: State Department and the Broadcasting Board of Governors Expand Efforts in the Middle East but Face Significant Challenges
Testimony issued by the General Accounting Office with an abstract that begins "The terrorist attacks of September 11, 2001, were a dramatic reminder of the importance of our need to cultivate a better public opinion of the United States abroad. Yet recent opinion research indicates that foreign publics, especially in countries with large Muslim populations, view the United States unfavorably. GAO issued two studies in 2003 that examined changes in U.S. public diplomacy resources and programs since September 11 within the State Department (State) and the Broadcasting Board of Governors (BBG); the U.S. government's strategies for its public diplomacy programs and how it measures their effectiveness; and the challenges that remain in executing U.S. public diplomacy efforts. Although the studies did not focus exclusively on the Middle East, they identified systemic problems that would apply to public diplomacy activities there."
Date:
February 10, 2004
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Visa Waiver Program
None
Date:
February 10, 2004
Creator:
Siskin, Alison
Object Type:
Report
System:
The UNT Digital Library
Votes Other than Favorably on Judicial Nominations, 1939-2003
Judicial nominations are submitted to the Senate by the President. Once a nomination is submitted, the Senate refers it to the Judiciary Committee. Either the Senate or the Senate Judiciary Committee may choose not to act when considering the nomination. If the Judiciary Committee does act and schedules a vote on a nominee, any of four motions can be made.
Date:
February 10, 2004
Creator:
Sollenberger, Mitchel A.
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 82, No. 39, Ed. 1 Saturday, January 10, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
January 10, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Effect of the electrostatic plasma lens on the emittance of ahigh-current heavy ion beam
We describe measurements we have made of the emittance of a high-current, moderate-energy ion beam after transport through a permanent-magnet electrostatic plasma lens. The results indicate the absence of emittance growth due to the lens, when the lens is adjusted for optimal beam focusing. The measured emittance for a 16 keV Cu{sup 2+} ion beam formed by a vacuum arc ion source was about 0.4 {pi} {center_dot} mm {center_dot} mrad at a beam current of 50 mA rising more-or-less linearly to 1.5 {pi} {center_dot} mm {center_dot} mrad at 250 mA, and was conserved in beam transport through the lens. These results have significance for the application of high-current ion sources and the electrostatic plasma lens to particle accelerator injection.
Date:
January 10, 2004
Creator:
Chekh, Yu.; Goncharov, A.; Protsenko, I. & Brown, I.G.
Object Type:
Article
System:
The UNT Digital Library
[Jefferson Davis Hospital, (arched entry detail in pediment above main façade basement)]
Photograph of the Jefferson Davis Hospital in Houston, Texas.
Date:
January 10, 2004
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Jefferson Davis Hospital, (main entry portico veiw west)]
Photograph of the Jefferson Davis Hospital in Houston, Texas.
Date:
January 10, 2004
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Jefferson Davis Hospital, (main (west) façade view west)]
Photograph of the Jefferson Davis Hospital in Houston, Texas.
Date:
January 10, 2004
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[Jefferson Davis Hospital, (view of hospital and boiler building west from I-45)]
Photograph of the Jefferson Davis Hospital in Houston, Texas.
Date:
January 10, 2004
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
MICROSTRUCTURAL FEATURES AFFECTING PROPERTIES AND AGING OF TRITIUM-EXPOSED AUSTENTIC STAINLESS STEEL
A project to implement a life-cycle engineering approach to tritium reservoirs has been initiated through the DOE - Technology Investment Projects. The first task in the project was to develop a comprehensive list of microstructural features that impact the aging performance of the tritium reservoirs. Each of the participating sites (SRNL, SNL, LANL, KCP) independently developed a list of features deemed integral to tritium reservoir performance based upon operational and design experience. An integrated list of features was ultimately developed by the project team that could be included in the modeling process. The features of interest were chosen based upon their impact on the following key factors in controlling crack growth: (1) the H/He solubility or diffusivity within the materials, (2) the stress/strain state at the crack tip, (3) material threshold for crack extension, and (4) microstructure based fracture distance, commonly estimated by grain size for intergranular fracture. Wherever possible, key references were identified to substantiate the effects on the tritium embrittlement phenomenon of the various microstructural features. Each of these features was chosen based upon their impact to the cracking phenomenon of interest. The features chosen were typically associated with orientation, morphology, and distribution of phases and inclusions, grain …
Date:
January 10, 2004
Creator:
Subramanian, K & Michael Morgan, M
Object Type:
Report
System:
The UNT Digital Library