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Determining thermal diffusivity and defect attributes in ceramic matrix composites by infrared imaging.
Ceramic matrix composites are being developed for numerous high temperature applications, including rotors and combustors for advanced turbine engines, heat exchanger and hot-gas filters for coal gasification plants. Among the materials of interest are silicon-carbide-fiber-reinforced-silicon-carbide (SiC{sub (f)}/SiC), silicon-carbide-fiber-reinforced-silicon-nitride (SiC{sub (f)}/Si{sub 3}N{sub 4}), aluminum-oxide-reinforced-alumina (Al{sub 2}O{sub 3(f)}/Al{sub 2}O{sub 3}), etc. In the manufacturing of these ceramic composites, the conditions of the fiber/matrix interface are critical to the mechanical and thermal behavior of the component. Defects such as delaminations and non-uniform porosity can directly effect the performance. A nondestructive evaluation (NDE) method, developed at Argonne National Laboratory has proved beneficial in analyzing as-processed conditions and defect detection created during manufacturing. This NDE method uses infrared thermal imaging for fill-field quantitative measurement of the distribution of thermal diffusivity in large components. Intensity transform algorithms have been used for contrast enhancement of the output image. Nonuniformity correction and automatic gain control are used to dynamically optimize video contrast and brightness, providing additional resolution in the acquired images. Digital filtering, interpolation, and least-squares-estimation techniques have been incorporated for noise reduction and data acquisition. The Argonne NDE system has been utilized to determine thermal shock damage, density variations, and variations in fiber coating in a full …
Date:
December 5, 1997
Creator:
Ahuja, S.; Ellingson, W. A.; Koehl, E. R. & Stuckey, J.
Object Type:
Article
System:
The UNT Digital Library
The Boerne Star (Boerne, Tex.), Vol. 93, No. 62, Ed. 1 Tuesday, August 5, 1997
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
August 5, 1997
Creator:
Aldridge, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 93, No. 71, Ed. 1 Friday, September 5, 1997
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
September 5, 1997
Creator:
Aldridge, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 93, No. 97, Ed. 1 Friday, December 5, 1997
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
December 5, 1997
Creator:
Aldridge, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Radiation damage of a glass-bonded zeolite waste form using ion irradiation.
Glass-bonded zeolite is being considered as a candidate ceramic waste form for storing radioactive isotopes separated from spent nuclear fuel in the electrorefining process. To determine the stability of glass-bonded zeolite under irradiation, transmission electron microscope samples were irradiated using high energy helium, lead, and krypton. The major crystalline phase of the waste form, which retains alkaline and alkaline earth fission products, loses its long range order under both helium and krypton irradiation. The dose at which the long range crystalline structure is lost is about 0.4 dpa for helium and 0.1 dpa for krypton. Because the damage from lead is localized in such a small region of the sample, damage could not be recognized even at a peak damage of 50 dpa. Because the crystalline phase loses its long range structure due to irradiation, the effect on retention capacity needs to be further evaluated.
Date:
December 5, 1997
Creator:
Allen, T. R. & Storey, B. G.
Object Type:
Article
System:
The UNT Digital Library
Analysis of Enriched Uranium and Weapons Plutonium Reloads for PWRs Using BRACC
Comparisons of the multicycle results demonstrate that the correlation coefficients based on the CASMO3 data were implemented correctly and that the Linear Reactivity Model is acceptably accurate for missed reloads containing both uranium and weapons plutonium fuel. The expanded set of correlation coefficients make BRACC a useful tool for performing multi-cycle in-core fuel management studies of PWR cores containing weapons plutonium.
Date:
June 5, 1997
Creator:
Alonso, G. & Parish, T. A.
Object Type:
Article
System:
The UNT Digital Library
Investigation of moisture-induced embrittlement of iron aluminides. Final report
Iron-aluminum alloys with 28 at.% Al and 5 at.% Cr were shown to be susceptible to hydrogen embrittlement by exposure to both gaseous hydrogen and water vapor. This study examined the effect of the addition of zirconium and carbon on the moisture-induced hydrogen embrittlement of an Fe{sub 3}Al,Cr alloy through the evaluation of tensile properties and fatigue crack growth resistance in hydrogen gas and moisture-bearing air. Susceptibility to embrittlement was found to vary with the zirconium content while the carbon addition was found to only affect the fracture toughness. Inherent fatigue crack growth resistance and fracture toughness, as measured in an inert environment, was found to increase with the addition of 0.5 at.% Zr. The combined addition of 0.5 at.% Zr and carbon only increased the fracture toughness. The addition of 1 at.% Zr and carbon was found to have no effect on the crack growth rate when compared to the base alloy. Susceptibility to embrittlement in moisture-bearing environments was found to decrease with the addition of 0.5 at.% Zr. In gaseous hydrogen, the threshold value of the Zr-containing alloys was found to increase above that found in the inert environment while the crack growth resistance was much lower. By …
Date:
June 5, 1997
Creator:
Alven, D. A. & Stoloff, N.S .
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Ray Amstutz, April 5, 1997
The National Museum of the Pacific War presents an oral interview with Ray Amstutz. Amstutz joined the Army Reserve (Student Training Corps) while in college at the University of Tulsa. On May 8, 1943 he was inducted and went to Fort Sill, Oklahoma for processing and then to Camp Maxie, Paris, Texas for three months basic training. The Army sent him back to school at the University of Oklahoma where he finished one semester. From there, he went to Camp Claiborne in Louisiana where they were trained to lay pipelines, maintain and repair engines, construct tanks, maintain pumps, etc. Amstutz's unit was put aboard a train, shipped to Oakland, California and put aboard a Liberty ship which sailed for Milne Bay, New Guinea; this was August/September 1944. He provides a nice description of the environment aboard ship for the 18 days it took to get to New Guinea. From there, they moved to Ora Bay and started unloading their equipment at Buna where major battles had already taken place. In Buna, they went inland, built a little dam on a river, laid suction pipe down into it, set up some pumps, and laid pipeline back to the docks; filling up …
Date:
April 5, 1997
Creator:
Amstutz, Ray
Object Type:
Sound
System:
The Portal to Texas History
University Press (Beaumont, Tex.), Vol. 74, No. 2, Ed. 1 Friday, September 5, 1997
Semiweekly newspaper from Lamar University in Beaumont, Texas that includes local, national, and campus news along with advertising.
Date:
September 5, 1997
Creator:
Andris, Tonya
Object Type:
Newspaper
System:
The Portal to Texas History
University Press (Beaumont, Tex.), Vol. 74, No. 19, Ed. 1 Wednesday, November 5, 1997
Semiweekly newspaper from Lamar University in Beaumont, Texas that includes local, national, and campus news along with advertising.
Date:
November 5, 1997
Creator:
Andris, Tonya
Object Type:
Newspaper
System:
The Portal to Texas History
Exchange-spring behavior in epitaxial hard/soft magnetic bilayer films.
We present results on the magnetic reversal process in epitaxial Sm-Co (1{bar 1}00)/TM (TM = Fe, Co) bilayer films prepared via magnetron sputtering onto Cr-buffered single-crystal MgO substrates. The magnetically hard Sm-Co films have 20-T uniaxial anisotropy and coercivities >3 T at room temperature. The magnetization of the soft layer is pinned at the interface to the hard-magnet layer and switches reversibly as expected for an exchange-spring magnet. With increasing soft layer thickness, the coercive field of the hard layer becomes significantly less than that of a single layer. We also present numerical solutions of a one-dimensional model that provide the spin configuration for each atomic layer. Comparison of the experimental results with the model simulations indicates that the exchange-spring behavior of our bilayer films can be understood from the intrinsic parameters of the hard and soft layers.
Date:
December 5, 1997
Creator:
Bader, S. D.; Fullerton, E. E.; Grimsditch, M.; Jiang, J. S. & Sowers, C. H.
Object Type:
Article
System:
The UNT Digital Library
Growth and characterization of epitaxial fcc Fe wedges on diamond (100).
Epitaxial Fe wedges with a thickness gradation from 0--20 {angstrom} were grown on diamond(100) at room temperature, subsequently annealed, and investigated with reflection high-energy electron diffraction and the surface magneto-optical Kerr effect. The results indicate that for <5 monolayer thicknesses the Fe grows on C(100) as smooth, epitaxial fcc films, which are not ferromagnetic, but that thicker films undergo a transition to become rough and the ordinary bcc ferromagnetic phase.
Date:
December 5, 1997
Creator:
Bader, S. D.; Keavneu, D. J.; Keune, W.; Li, D. & Pearson, J.
Object Type:
Article
System:
The UNT Digital Library
W-320 waste retrieval sluicing system transfer line flushing volume and frequency calculation
The calculations contained in this analysis document establish the technical basis for the volume, frequency, and flushing fluid to be utilized for routine Waste Retrieval Sluicing System (WRSS) process line flushes. The WRSS was installed by Project W-320, Tank 24 I-C-106 Sluicing. The double contained pipelines being flushed have 4 inch stainless steel primary pipes. The flushes are intended to prevent hydrogen build up in the transfer lines and to provide ALARA conditions for maintenance personnel.
Date:
November 5, 1997
Creator:
Bailey, J. W.
Object Type:
Report
System:
The UNT Digital Library
First use of a laser-driven polarized H/D target at the IUCF cooler.
The HERMES Laser-Driven Target Task Force (Argonne, Erlangen and Illinois) is charged with developing a polarized H/D target for use in the HERA ring at DESY. Rapid progress was made in the beginning of 1996, leading us to the decision to test the target in a realistic experimental environment. In particular, polarizations of 0.6 and flows above 10{sup 18} atoms{center_dot}s{sup {minus}1} have been achieved on the bench. The laser-driven target and a simple detector system are currently installed in Cooler storage ring at the Indiana University Cyclotron Facility in order to test its applicability to nuclear physics experiments. Target polarizations are being measured using the {rvec H}(p, p) and {rvec D}(p, p) reactions. Initial tests were reasonably successful and the target is well along toward becoming viable for nuclear physics.
Date:
December 5, 1997
Creator:
Bailey, K.; Brack, J.; Cadman, R. V.; Cummings, W. J.; Fedchak, J.; Fox, B. et al.
Object Type:
Article
System:
The UNT Digital Library
Hydrodynamic instability in strong media
This paper reviews the All Russian Scientific Research Institute of Experimental Physics open publications on hydrodynamic instability in strong media.
Date:
March 5, 1997
Creator:
Bakhrakh, S.M.; Drennov, O.B. & Kovalev, N.P.
Object Type:
Report
System:
The UNT Digital Library
News Bulletin (Castroville, Tex.), Vol. 38, No. 23, Ed. 1 Thursday, June 5, 1997
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
June 5, 1997
Creator:
Barnes, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Brady Handgun Violence Prevention Act
None
Date:
August 5, 1997
Creator:
Bea, Keith
Object Type:
Report
System:
The UNT Digital Library
Structure and electrochemical potential simulation for the cathode material Li(1+x)V(3)O(8).
The structure and electrochemical potential of monoclinic Li{sub 1+x}V{sub 3}O{sub 8} were calculated within the local-density-functional-theory framework by use of plane-wave-pseudopotential methods. Special attention was given to the compositions 1+x=1.2 and 1+x=4, for which x-ray diffraction structure refinements are available. The calculated low-energy configuration for 1+x=4 is consistent with the three Li sites identified in x-ray diffraction measurements and predicts the position of the unobserved Li. The location of the tetrahedrally coordinated Li in the calculated low-energy configuration for 1+x=1.5 is consistent with the structure measured by x-ray diffraction for Li{sub 1.2}V{sub 3}O{sub 8}. Calculations were also performed for the two monoclinic phases at intermediate Li compositions, for which no structural information is available. Calculations at these compositions are based on hypothetical Li configurations suggested by the ordering of vacancy energies for Li{sub 4}V{sub 3}O{sub 8} and tetrahedral site energies in Li{sub 1.5}V{sub 3}O{sub 8}. The internal energy curves for the two phases cross near 1+x=3. Predicted electrochemical potential curves agree well with experiment.
Date:
December 5, 1997
Creator:
Benedek, R.; Thackeray, M. M. & Yang, L. H.
Object Type:
Article
System:
The UNT Digital Library
Definition and means of maintaining the criticality prevention design features portion of the PFP safety envelope
This document summarizes existing criticality safety evaluations and identifies design features that are considered to be one of the two contingencies required to prevent exceeding the criticality limit of 0.95 k eff in the Plutonium Finishing Plant.
Date:
February 5, 1997
Creator:
Bergquist, G. G.
Object Type:
Report
System:
The UNT Digital Library
Research and development for the declassification productivity initiative. Quarterly report, January 1997--August 1997
The highlight for the first quarter was the presentation of research progress and findings at the DPI Symposium on March 5, 1997. Since that presentation, additional progress was slowed down due to the decreased budget funding for year two, and consequently, the decrease in time-effort of the principal investigators. This report summarizes the progress in each of the topical areas to date. A research article has been prepared for publication for the Optical Character Recognition project; two progress reports are included for the Logical Analysis project; and two progress reports for the Knowledge Representation project. Research activities for the Tipster Technology project will resume this fall.
Date:
March 5, 1997
Creator:
Bessonet, C.G. de
Object Type:
Report
System:
The UNT Digital Library
Performance of a diode-end-pumped Yb:YAG laser
Using an end-pumped technology developed at LLNL we have demonstrated a Yb:YAG laser capable of delivering up to 434 W of CW power and 280 W of Q-switched power. In addition, we have frequency doubled the output to 515 nm using a dual crystal scheme to produce 76 W at 10 kHz in a 30 ns pulse length.
Date:
May 5, 1997
Creator:
Bibeau, C.; Beach, R.; Ebbers, C. & Emanuel, M.
Object Type:
Article
System:
The UNT Digital Library
Modified ring stretch tensile testing of Zr-1Nb cladding.
In a round robin effort between the US Nuclear Regulatory Commission, Institut de Protection et de Surete Nucleaire in France, and the Russian Research Centre-Kurchatov Institute, Argonne National Laboratory conducted 16 modified ring stretch tensile tests on unirradiated samples of Zr-1Nb cladding, which is used in Russian VVER reactors. Tests were conducted at two temperatures (25 and 400 C) and two strain rates (0.001 and 1 s{sup {minus}1}). At 25 C and 0.001 s{sup {minus}1}, the yield strength (YS), ultimate tensile strength (UTS), uniform elongation (UE), and total elongation (TE) were 201 MPa, 331 MPa, 18.2%, and 57.6%, respectively. At 400 C and 0.001 s{sup {minus}1}, the YS, UTS, UE, and TE were 109 MPa, 185 MPa, 15.4%, and 67.7%, respectively. Finally, at 400 C and 1 s{sup {minus}1}, the YS, UTS, UE, and TE were 134 MPa, 189 MPa, 18.9%, and 53.4%, respectively. The high strain rate tests at room temperature were not successful. Test results proved to be very sensitive to the amount of lubrication used on the inserts; because of the large contact area between the inserts and specimen, too little lubrication leads to significantly higher strengths and lower elongations being reported. It is also important to …
Date:
December 5, 1997
Creator:
Billone, M. C.; Chung, H. M.; Cohen, A. B.; Majumdar, S.; Neimark, L. A. & Ruther, W. E.
Object Type:
Article
System:
The UNT Digital Library
The Harper Herald (Harper, Tex.), Vol. 69, No. 30, Ed. 1 Tuesday, August 5, 1997
Weekly newspaper from Harper, Texas that includes local, state, and national news along with advertising.
Date:
August 5, 1997
Creator:
Bishop, Karen
Object Type:
Newspaper
System:
The Portal to Texas History
DOE integrated safeguards and security (DISS) system a nation-wide distributed information system for personnel security
DISS uses secure client-server and relational database technology across open networks to address the problems of security clearance request processing and tracking of security clearances for the Department of energy. The system supports the entire process from data entry by the prospective clearance holders through tracking of all DOE clearances, and use of standard DOE badges in automated access control systems throughout the DOE complex.
Date:
June 5, 1997
Creator:
Block, B.
Object Type:
Article
System:
The UNT Digital Library