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Shock-induced alpha-omega structural phase transformation of titanium: A molecular-dynamics study
None
Date:
March 15, 2004
Creator:
Sadigh, B; Lenosky, T; Oppelstrup, T; Minich, R & Gilmer, G
Object Type:
Article
System:
The UNT Digital Library
[Calibration methods for neutron diagnostics at Omega]. DOE/NLUF final report
The investigation of Calibration Methods for Neutron Diagnostics at Omega is still underway. The data shown here is a compilation of measurements taken at Omega during the time of the grant. The data set has been updated with additional information taken this year. The neutron yield from an ICF event was determined by measuring the activity of an aluminum sample activated by target-produced DT neutrons. The radioactive nuclei {sup 24}Na and {sup 27}Mg, which were produced via the {sup 27}Al(n,{alpha}){sup 24}Na and {sup 27}Al(n,p){sup 27}Mg direct reactions, beta decay to excited states of {sup 24}Mg and {sup 27}Al respectively. These excited states then emitted gamma rays as the nuclei de-excite to their respective ground states. The gamma rays are detected and counted. From their numbers the neutron yield is determined.
Date:
January 15, 1998
Creator:
Padalino, S.
Object Type:
Report
System:
The UNT Digital Library
FY12 LLNL OMEGA Experimental Programs
None
Date:
November 15, 2012
Creator:
Heeter, R.; Fournier, K.; Baker, K.; Celliers, P.; Fratanduono, D.; Hawreliak, J. et al.
Object Type:
Report
System:
The UNT Digital Library
In-situ spatially resolved x-ray diffraction mapping of the alpha to beta to alpha transformation in commercially pure titanium arc welds
Spatially Resolved X-Ray Diffraction (SRXRD) is used to map the {alpha}{r_arrow}{beta}{r_arrow}{alpha} phase transformation in the heat affected zone (HAZ) of commercially pure titanium gas tungsten arc welds. In-situ SRXRD experiments were conducted on arc welds using a 200 pm diameter x-ray beam at Stanford Synchrotron Radiation Laboratory (SSRL). A map was created which identifies six HAZ microstructural regions that exist between the liquid weld pool and the base metal during welding. The first region is single phase {beta}-Ti that forms in a 2- to 3-mm band adjacent to the liquid weld pool. The second region is back transformed {alpha}-Ti that forms behind the portion of the HAZ where {beta}-Ti was once present at higher temperatures. The third region is completely recrystallized {alpha}-Ti that forms in a 2- to 3-mm band surrounding the single phase {beta}-Ti region. Recrystallized {alpha}-Ti was observed by itself and also with varying amounts of {beta}-Ti. The fourth region of the weld is the partially transformed zone where {alpha}-Ti and {beta}-Ti coexist during welding. The fifth region is directly behind the partially transformed zone and consists of a mixture of recrystallized and back transformed {alpha}-Ti The sixth region is farthest from the weld pool and consists of …
Date:
May 15, 1998
Creator:
Elmer, J. W., LLNL
Object Type:
Article
System:
The UNT Digital Library
Particle deposition in human and canine tracheobronchial casts
The aim of this work is to measure deposition patterns and efficiencies of aerosol particles within realistic, single-pathway physical models of the tracheobronchial airways of humans and experimental animals over a range of particle sizes for a variety of respiratory modes and rates. This will provide data needed to assess the dose to the bronchial epithelium from inhaled radon progeny. In the current year theoretical studies based on a developing flow model were extended. We concluded that although the developing flow model is better predictor of the data than assumption of parabolic flow, the predicated deposition is significantly lower than that predicted by our best fit equation. The mass size dispersion of particles classified according to their electrical mobilities was also studies. For the conditions tested, doubly charged particles constituted 9--13% of the total particle number concentration and 24--48% of the total mass concentration. We demonstrated that the multiply charged particles are effectively removed, and nearly monodisperse particles produced, if an impactor is placed in the aerosol generation system. A condensation aerosol generator was constructed and tested for the production of high concentrations of radioactively tagged aerosol particles with diameters from 0.2 to 10{mu}m. 9 refs.
Date:
January 15, 1991
Creator:
Cohen, B.S.
Object Type:
Report
System:
The UNT Digital Library
A Study of the Mechanisms of Heat Treatment of Zirconium-Base Alloys : Status Report, July 1, 1955 - February 29, 1956
The kinetics of transformation of zirconium binary alloys is being pursued. Mechanical property variation as a function of transformation if also being investigated. Zirconium-tin and zirconium-titanium alloys transform very rapidly when quenched from the beta field. These alloys have, generally speaking, been demonstrated to be not amenable to heat treatment in the normal sense of the word. Eutectoid alloys, principally zirconium-molybdenum alloys, have shown a definite response to heat treatment in terms of mechanical property variation. An embrittling agent, probably "omega" phase, is suspect at this time for the brittleness observed in certain molybdenum alloys and the very high hardness levels reached in other alloys such as zirconium-niobium and zirconium-thorium. Work to establish the existence of omega phase is in progress and, it is hoped, suggestions for avoiding the brittle condition associated with it will be forthcoming.
Date:
March 15, 1956
Creator:
Domagala, R. F. & Levinson, David W.
Object Type:
Report
System:
The UNT Digital Library
Ideal ballooning modes in axisymmetric mirror machines
A simple code is described that finds marginally stable (..omega../sup 2/ = 0) ballooning-type MHD modes, localized about a field line in an axisymmetric, open-ended, plasma confinement device. The equations are based on a lower bound for the perturbed energy delta W, derived by W. Newcomb from the ideal MHD energy principle, and are cast in the form of a Ricatti equation for the first derivative of the eigenfunction, with the open boundary conditions that this derivative vanish at the plasma boundary down each field line. The input to the code is the two-dimensional shape of a field line, the field strength B(s), and parameters to define pressure profiles throughout the system. The objective is to find the highest plasma pressures for which the given line is MHD-stable.
Date:
December 15, 1980
Creator:
Baldwin, D.E.; McNamara, B. & Willmann, P.
Object Type:
Report
System:
The UNT Digital Library
High resolution interface nanochemistry and structure. Progress report, December 1, 1994--November 30, 1995
Progress is described in the following research areas concerned with high resolution interface nanochemistry and structure: ceramic interfaces and grain boundaries; metal/alpha (6H)-SiC(0001) interfaces; oxygen distributions in monolithic silicon carbide; SiC/nitride and metal on nitride interfaces; and interface synthesis.
Date:
August 15, 1995
Creator:
Carpenter, R.W.
Object Type:
Report
System:
The UNT Digital Library
Special Zirconium Alloys. Report No. 18 (Summary) for January 1, 1956- October 31, 1957
Tensile properties amd impact strengths were determined for iodide Zr, sponge Zr, and alloys based on both grades of metal, containing nominally 1.5% M. Sheet specimens, welded and unwelded, were tested. Tensile properties were established at room temperature and 300 deg C. Impact strength values were measured at --100 deg , R.T., 100 deg , 200 deg , and 300 deg C. These (alpha) materials generally exhibited a lack of heat treatability, litile or no deterioration of properties due to welding, and essentially no indication of impact transition temperature. Tensile strength and impact behavior were established for alloys based on iodide zirconium containing 15% Nb, 15% Nb + 2% Pd, 15% Nb + 2% Pt, 15% Nb + 1% Fe, and a binary sponge zirconium + 15% Hb alloy. High strength levels could be established by proper heat treatment. The presence of Pd, Ft, or Fe seemed to delay the formation of the embrittiing agent as determined by hardness and resistivity vs time of anneal curves for these alloys. uth)
Date:
October 15, 1957
Creator:
Domagala, R. F. & Levinson, D. W.
Object Type:
Report
System:
The UNT Digital Library
The Redbird (Beaumont, Tex.), Vol. 13, No. 14, Ed. 1 Friday, February 15, 1963
Weekly newspaper from Lamar State College of Technology in Beaumont, Texas that includes local and campus news along with advertising.
Date:
February 15, 1963
Creator:
du Perier, Mary Anne
Object Type:
Newspaper
System:
The Portal to Texas History
The Redbird (Beaumont, Tex.), Vol. 7, No. 9, Ed. 1 Friday, November 15, 1957
Weekly newspaper from Lamar State College of Technology in Beaumont, Texas that includes local and campus news along with advertising.
Date:
November 15, 1957
Creator:
Barnes, Dorothy
Object Type:
Newspaper
System:
The Portal to Texas History
The Redbird (Beaumont, Tex.), Vol. 22, No. 6, Ed. 1 Friday, October 15, 1971
Weekly newspaper from Lamar University in Beaumont, Texas that includes local and campus news along with advertising.
Date:
October 15, 1971
Creator:
Galiano, Julian
Object Type:
Newspaper
System:
The Portal to Texas History
The J-TAC (Stephenville, Tex.), Vol. 43, No. 4, Ed. 1 Tuesday, October 15, 1963
Weekly student newspaper from Tarleton State College in Stephenville, Texas that includes local, state and campus news along with advertising.
Date:
October 15, 1963
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Ranger (San Antonio, Tex.), Vol. 42, No. 7, Ed. 1 Friday, December 15, 1967
Bi-weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.
Date:
December 15, 1967
Creator:
San Antonio College
Object Type:
Newspaper
System:
The Portal to Texas History
The Redbird (Beaumont, Tex.), Vol. 15, No. 12, Ed. 1 Friday, January 15, 1965
Weekly newspaper from Lamar State College of Technology in Beaumont, Texas that includes local and campus news along with advertising.
Date:
January 15, 1965
Creator:
Isaac, C. V. Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
The Prospector (El Paso, Tex.), Vol. 35, No. 49, Ed. 1 Tuesday, April 15, 1969
Semiweekly student newspaper from the University of Texas at El Paso that includes campus news and information along with advertising.
Date:
April 15, 1969
Creator:
University of Texas at El Paso
Object Type:
Newspaper
System:
The Portal to Texas History
The Redbird (Beaumont, Tex.), Vol. 19, No. 9, Ed. 1 Friday, November 15, 1968
Weekly newspaper from Lamar State College of Technology in Beaumont, Texas that includes local and campus news along with advertising.
Date:
November 15, 1968
Creator:
Magnus, C. Lynn
Object Type:
Newspaper
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 23, No. 26, Ed. 1 Friday, October 15, 1937
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
October 15, 1937
Creator:
Purdy, Millard
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Daily (Norman, Okla.), Vol. 8, No. 164, Ed. 1 Tuesday, April 15, 1924
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes local and campus news along with advertising.
Date:
April 15, 1924
Creator:
Webb, Guy P.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Daily (Norman, Okla.), Vol. 23, No. 74, Ed. 1 Wednesday, January 15, 1947
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
January 15, 1947
Creator:
Marchant, Peg
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Rambler (Fort Worth, Tex.), Vol. 40, No. 10, Ed. 1 Tuesday, November 15, 1966
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
November 15, 1966
Creator:
Marley, Trudy
Object Type:
Newspaper
System:
The Portal to Texas History
The Optimist (Abilene, Tex.), Vol. 64, No. 7, Ed. 1, Friday, October 15, 1976
Weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
October 15, 1976
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The J-TAC (Stephenville, Tex.), Vol. 182, No. 7, Ed. 1 Thursday, October 15, 2009
Weekly student newspaper from Tarleton State University in Stephenville, Texas that includes local, state and campus news along with advertising.
Date:
October 15, 2009
Creator:
Cedeno, Michael
Object Type:
Newspaper
System:
The Portal to Texas History
The Redbird (Beaumont, Tex.), Vol. 16, No. 5, Ed. 1 Friday, October 15, 1965
Weekly newspaper from Lamar State College of Technology in Beaumont, Texas that includes local and campus news along with advertising.
Date:
October 15, 1965
Creator:
Oglethorpe, Bonnie
Object Type:
Newspaper
System:
The Portal to Texas History