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The Role of Ledge Nucleation/Migration in ''Omega'' Plate Thickening Behavior in Al-Cu-Mg-Ag Alloys
The thickening kinetics of {Omega} plates in an Al-4Cu-0.3Mg-0.2Ag (wt. %) alloy have been measured at 200 C, 250 C and 300 C using conventional transmission electron microscopy techniques. At all temperatures examined the thickening showed a linear dependence on time. At 200 C the plates remained less than 6nm in thickness after 1000h exposure. At temperatures above 200 C the thickening kinetics are greatly increased. Atomic resolution Z-contrast microscopy has been used to examine the structure and chemistry of the (001){sub {Omega}} {parallel} (111){sub {alpha}} interphase boundary in samples treated at each temperature. In all cases, two atomic layers of Ag and Mg segregation were found at the broad face of the plate. The risers of the growth ledges and the ends of the plates were free of segregation. No significant levels of Ag or Mg were detected inside the plate at any time. The necessary redistribution of Ag and Mg accompanying a migrating thickening ledge occurs at all temperatures and is not considered to play a decisive role in the excellent coarsening resistance exhibited by the {Omega} plates at temperatures up to 200 C. Plates transformed at 200 C rarely contained ledges and usually exhibited a strong vacancy …
Date:
March 16, 2001
Creator:
Hutchinson, C.R.
Object Type:
Article
System:
The UNT Digital Library
High Energy K(alpha) Radiography Using High-intensity, Short-pulse Lasers
We have performed experiments using Callisto, the Vulcan 100 TW and the Vulcan Petawatt high intensity lasers to understand the characteristics of high energy, K{alpha} x-ray sources and to implement workable radiography solutions at 20-100 keV. Our measurements show that the K{alpha} size from a simple foil target is larger than 60 {micro}m, far larger than the experiment resolution requirement. The total K{alpha} yield is independent of target thicknesses verifying that refluxing plays a major role in photon generation. Smaller radiating volumes emit brighter K{alpha} radiation. 1-D radiography experiments using small-edge-on foils resolved 10 {micro}m features with high contrast. We tested a variety of small volume 2-D point sources such as cones, wires, and embedded wires, measuring photon yields and comparing our measurements with predictions from hybrid-PIC LSP simulations. In addition to high-energy, high-resolution backlighters, future experiments will also need imaging detectors and diagnostic tools that are workable in the 20-100 keV energy range. An initial look at some of these detector issues is also presented.
Date:
November 16, 2005
Creator:
Park, H.; Izumi, N.; Key, M. H.; King, J. A.; Koch, J. A.; Landen, O. L. et al.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0297.0179]
Photograph taken for a story in the Oklahoma Times newspaper. Caption: "Crocheting afghans is one of the hobbies of Mrs. James De Angelo, president of the University of Oklahoma chapter of the Alpha Tau Omega Mothers and Wives Club."
Date:
October 16, 1972
Creator:
Miller, Joe
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Exploration of GaTe for Gamma Detectors
The layered III-VI semiconductor Gallium Telluride has potential for room temperature gamma ray spectroscopy applications due to its band gap of 1.67 eV, and average atomic number of 45:31 (Ga) and 52 (Te). The physical properties of GaTe are highly anisotropic due to covalent bonding within the layer and van der Waals bonding between layers. This work reports the results of surface and bulk processing, surface characterization, and electrical characterization of diodes formed on both the laminar and non-laminar GaTe surfaces. Alpha detection measurements were also performed.
Date:
November 16, 2007
Creator:
Conway, A. M.; Reinhardt, C. E.; Nikolic, R. J.; Nelson, A. J.; Wang, T. F.; Wu, K. J. et al.
Object Type:
Article
System:
The UNT Digital Library
X-ray Spectroscopy with Elliptical Crystals and Face-On Framing Cameras
X-ray spectrometers using elliptically bent crystals have desirable properties for applications requiring broad spectral coverage, good spectral resolution, and minimized source broadening. Previous work used custom-positioned film or microchannel plate detectors. They find it is also useful and cost-effective to field elliptical crystals in existing snouts on the face-on gated microchannel plate framing cameras commonly used at many facilities. they numerically explored the full design space (spectral range and resolution) of elliptical crystals compatible with the new MSPEC multipurpose spectrometer snout. They have tested at the Omega laser an elliptical RAP crystal with 174 mm focal length, 0.9885 eccentricity, and 4.6 degree inclination, viewing from 1.0 to at least 1.7 keV with E/dE of 300-500. A slit (2x mag) images 3 mm sources with 70 um spatial resolution.
Date:
April 16, 2004
Creator:
Heeter, R.; Emig, J.; Fournier, K.; Hansen, S.; May, M. & Young, B.
Object Type:
Article
System:
The UNT Digital Library
METALLURGY DIVISION ANNUAL PROGRESS REPORT FOR PERIOD ENDING SEPTEMBER 1, 1959
7 = 9 9 9 9 7 7 7 = 9 9 9 95 : > @ 9 ; 5 8 @ = K : . ighpurity Nb deformed by impact or slow compression at - 196 deg C. An apparent phase transformation was detected in high- purity Ga deformed at 4.2 deg K. The specific heat of the group IV-A metals and alloys of Zr-In and Zr-Sn were measured from 1.2 to 4.5 deg K. In the Zr-rich portion of the Zr-Ga phase diagram, the alpha / beta phase boundaries of Zr are depressed by additions of Ga and the beta phase decomposes by a eutectoid reaction. The Cd pressures of alpha - and beta - Zr alloys containing 1 to 11% Cd were measured between 1090 and 1325 deg K. Crystal structures of several unreported transition-metal fluorides, rare-earth hydrides and nitrides were determined. Progress in the study of phase transitions in beta -quenched Zr-Nb alloys aged below the eutectoid temperature is reported. A high-temperature investigation of the order-disorder phase transition of a Cu31 at.% Au alloy has revealed an intermediate periodic antiphase condition. A previously described x- raydiffraction technique for the measurement of the thickness and strain of …
Date:
December 16, 1959
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Redbird (Beaumont, Tex.), Vol. 19, No. 29, Ed. 1 Friday, May 16, 1969
Weekly newspaper from Lamar State College of Technology in Beaumont, Texas that includes local and campus news along with advertising.
Date:
May 16, 1969
Creator:
Ramsey, Mike
Object Type:
Newspaper
System:
The Portal to Texas History
The Redbird (Beaumont, Tex.), Vol. 7, No. 29, Ed. 1 Friday, May 16, 1958
Weekly newspaper from Lamar State College of Technology in Beaumont, Texas that includes local and campus news along with advertising.
Date:
May 16, 1958
Creator:
Barnes, Dorothy
Object Type:
Newspaper
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 54, No. 128, Ed. 1 Tuesday, April 16, 1968
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
April 16, 1968
Creator:
Winn, Barbara A.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Redbird (Beaumont, Tex.), Vol. 6, No. 8, Ed. 1 Friday, November 16, 1956
Weekly newspaper from Lamar State College of Technology in Beaumont, Texas that includes local and campus news along with advertising.
Date:
November 16, 1956
Creator:
Obenhaus, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 41, No. 67, Ed. 1 Thursday, December 16, 1954
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
December 16, 1954
Creator:
Wagner, Jo Ann
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Lamar Tech Redbird (Beaumont, Tex.), Vol. 13, No. 9, Ed. 1 Friday, November 16, 1962
Weekly newspaper from Lamar State College of Technology in Beaumont, Texas that includes local and campus news along with advertising.
Date:
November 16, 1962
Creator:
du Perier, Mary Anne
Object Type:
Newspaper
System:
The Portal to Texas History
The Campus Chat (Denton, Tex.), Vol. 35, No. 17, Ed. 1 Friday, November 16, 1951
Weekly student newspaper from the North Texas State College in Denton, Texas that includes local, state, and campus news along with advertising.
Date:
November 16, 1951
Creator:
Skidmore, Gerald
Object Type:
Newspaper
System:
The Portal to Texas History
The Redbird (Beaumont, Tex.), Vol. 21, No. 6, Ed. 1 Friday, October 16, 1970
Weekly newspaper from Lamar State College of Technology in Beaumont, Texas that includes local and campus news along with advertising.
Date:
October 16, 1970
Creator:
Ramsey, Mike
Object Type:
Newspaper
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 101, No. 14, Ed. 1 Wednesday, September 16, 2015
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
September 16, 2015
Creator:
Mussatto, Joe
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Redbird (Beaumont, Tex.), Vol. 18, No. 18, Ed. 1 Friday, February 16, 1968
Weekly newspaper from Lamar State College of Technology in Beaumont, Texas that includes local and campus news along with advertising.
Date:
February 16, 1968
Creator:
Goode, Charles
Object Type:
Newspaper
System:
The Portal to Texas History
The J-TAC (Stephenville, Tex.), Ed. 1 Thursday, January 16, 1986
Weekly student newspaper from Tarleton State University in Stephenville, Texas that includes local, state and campus news along with advertising.
Date:
January 16, 1986
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 10, No. 153, Ed. 1 Friday, April 16, 1926
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes local and campus news along with advertising.
Date:
April 16, 1926
Creator:
Cate, Roscoe
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The University Press (Beaumont, Tex.), Vol. 24, No. 8, Ed. 1 Friday, November 16, 1973
Weekly newspaper from Lamar University in Beaumont, Texas that includes local and campus news along with advertising.
Date:
November 16, 1973
Creator:
Irving, Rondah
Object Type:
Newspaper
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 99, No. 41, Ed. 1 Wednesday, October 16, 2013
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
October 16, 2013
Creator:
Margerum, Kyle
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Lone Star Lutheran (Seguin, Tex.), Vol. 50, No. 26, Ed. 1 Friday, May 16, 1969
Student newspaper from Texas Lutheran College in Seguin, Texas that includes news of interest to students and staff along with advertising.
Date:
May 16, 1969
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The H-SU Brand (Abilene, Tex.), Vol. 55, No. 5, Ed. 1, Tuesday, September 16, 1969
Weekly student newspaper from Hardin-Simmons University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
September 16, 1969
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Prospector (El Paso, Tex.), Vol. 29, No. 20, Ed. 1 Saturday, March 16, 1963
Weekly student newspaper from Texas Western College in El Paso, Texas that includes campus news and information along with advertising.
Date:
March 16, 1963
Creator:
Texas Western College
Object Type:
Newspaper
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 18, No. 56, Ed. 1 Wednesday, November 16, 1932
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes local and campus news along with advertising.
Date:
November 16, 1932
Creator:
Hill, Christine Squire
Object Type:
Newspaper
System:
The Gateway to Oklahoma History