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DEVELOPMENT OF PLUTONIUM-BEARING FUEL MATERIALS. Progress Report for Period January 1 through March 31, 1962

Description: During this reporting period, particular effort was of aced on powder blending and pellet sintering studies prior to irradiation sample fabrication, and, subsequently, the production and characterization of the pellets slated for irradiation. Also, PuO/sub 2/ and UO/sub 2/-PuO/sub 2/ characterization studies were continued, and new techniques are being developed. Specifically, dynamic moisture pickup determinations on PuO/sub 2/ were made in moist air, N, and CO/ sub 2/ atmospheres using a reco… more
Date: October 31, 1962
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High-Temperature Research on Carbides for Fuel and Structural Applications.

Description: High temperature physico-chemical properties of refractory carbides for fuel and structural use were determined. Density and phases of vacuum hot pressed HfC, TaC, and ZrC are tabulated and the diffusion coefficients, lattice parameters, and thermodynamic properties of TaC and UC are given. (F.S.)
Date: October 31, 1969
Creator: White, J. F. & Juenke, E. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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4-D XRD for strain in many grains using triangulation

Description: Determination of the strains in a polycrystalline materialusing 4-D XRD reveals sub-grain and grain-to-grain behavior as a functionof stress. Here 4-D XRD involves an experimental procedure usingpolychromatic micro-beam X-radiation (micro-Laue) to characterizepolycrystalline materials in spatial location as well as with increasingstress. The in-situ tensile loading experiment measured strain in a modelaluminum-sapphire metal matrix composite using the Advanced Light Source,Beam-line 7.3.3. Micr… more
Date: December 31, 2006
Creator: Bale, Hrishikesh A.; Hanan, Jay C. & Tamura, Nobumichi
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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X-ray production with sub-picosecond laser pulses

Description: The interaction of intense, sub-picosecond laser pulses with solid targets produces intense picosecond x-ray pulses. With focused laser pulses of several 10 {sup 18} W/cm{sup 2}, He-like and H-like line radiation from targets such as aluminum and silicon has been produced. The energy conversion efficiency from the laser pulse energy to the 1--2 keV line x-rays is nearly one percent. The duration of the line x-ray radiation is of the order of ten picoseconds, although this may be an upper estima… more
Date: December 31, 1993
Creator: Schappert, G. T.; Cobble, J. A.; Fulton, R. D. & Kyrala, G. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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On diamond windows for high power synchrotron x-ray beams

Description: Recent advances in chemical vapor deposition (CVD) technology has made available thin, free-standing polycrystalline diamond foils that can be used as the window material on high heat load synchrotron x-ray beamlines. Diamond windows have many advantages that stem from the exceptionally attractive thermal, structural, and physical properties of diamond. Numerical simulations indicate that diamond windows can offer an attractive and at times the only alternative to beryllium windows for use on t… more
Date: December 31, 1991
Creator: Khounsary, A. M. & Kuzay, T. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A 200 kV fast rise time, low jitter, trigger system with magnetic pulse sharpener

Description: The DARHT Facility is being designed at Los Alamos National Laboratory to produce high resolution flash radiographs of hydrodynamic experiments. Two linear induction accelerators (LIA), each in the range of 16 to 20 MeV, will be used to produce intense bremsstrahlung X-ray pulses of short duration (60 ns flat top). Each LIA will produce a 3 kA, high brightness, electron beam using a 4 MeV injector and a series of 250 kV induction cells. Technology demonstration of key accelerator subsystems is … more
Date: December 31, 1993
Creator: Jaitly, N. C.; Ramrus, A.; Coleman, M. D.; Earley, L. M.; Downing, J. N.; Reisch, H. H. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ballistic impulse gauge

Description: This invention is comprised of a gauge for detecting the impulse generated in sample materials by X-rays or other impulse producing mechanisms which utilizes a pair of flat annular springs to support a plunger relative to a housing which may itself be supported by a pair of flat annular springs in a second housing. The plunger has a mounting plate mounted on one end and at the other, a position or velocity transducer is mounted. The annular springs consist of an outer ring and an inner ring wit… more
Date: December 31, 1992
Creator: Ault, S. K.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Many-body corrections in XAFS

Description: The importance of many-body effects in the theory of XAFS is reviewed. The dominant effects are inelastic losses: Extrinsic losses refer to inelastic losses in the propagation of the photoelectron and are treated using a complex, energy-dependent self-energy. The real part of the self-energy yields an important energy-dependent shift in the phase of the XAFS oscillations, while the imaginary part contributes to the mean-free-path. Intrinsic losses refer to losses associated with the creation of… more
Date: December 31, 1992
Creator: Rehr, J. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Characterization of porosity via secondary reactor. Quarterly technical progress report, 1 October 1992--31 December 1992

Description: In this quarterly technical Progress report, we summarize the progress which has been achieved with the development of the small angle scattering capability to be used in the current project. In particular, the following was accomplished during the reporting period. The parameter estimation code, MARQFIT, has been tested and is fully operational. The code has been applied to small angle neutron scattering (SANS) data on coals swollen with deuterated solvents. Application of the FPPS model to th… more
Date: December 31, 1992
Creator: Calo, J. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

X-ray amplifier energy deposition scaling with channeled propagation

Description: The spatial control of the energy deposited for excitation of an x-ray amplifier plays an important role in the fundamental scaling relationship between the required energy, the gain and the wavelength. New results concerning the ability to establish confined modes of propagation of sort pulse radiation of sufficiently high intensity in plasmas lead to a sharply reduced need for the total energy deposited, since the concentration of deposited power can be very efficiently organized.
Date: December 31, 1991
Creator: Boyer, K.; Luk, T. S. & McPherson, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Magnetic effects in anomalous dispersion

Description: Spectacular enhancements of magnetic x-ray scattering have been predicted and observed experimentally. These effects are the result of resonant phenomena closely related to anomalous dispersion, and they are strongest at near-edge resonances. The theory of these resonances will be developed with particular attention to the symmetry properties of the scatterer. While the phenomena to be discussed concern magnetic properties the transitions are electric dipole or electric quadrupole in character … more
Date: December 31, 1992
Creator: Blume, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Genome sequencing by direct imaging x-ray color holography. Appendix A

Description: Currently available techniques for sequencing DNA are inadequate for oligonucleotides of length greater than 600 nucleotides and are most effective in the 300 nucleotide range. Automated sequencers are now available which use, basically, the Sanger dideoxy termination method. The sequencing rates of these conventional methods are extremely low and involve very labor intensive procedures, requiring on the order of two man-years of effort for the determination of the sequence of a single 100 kilo… more
Date: December 31, 1989
Creator: Haddad, W.; Boyer, K.; Solem, J. C.; Rhodes, C. K. & Moriarty, R. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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X-ray tomographic image magnification process, system and apparatus therefor

Description: A computerized three-dimensional x-ray tomographic microscopy system is disclosed, comprising: (a) source means for providing a source of parallel x-ray beams; (b) staging means for staging and sequentially rotating a sample to be positioned in the path of the beams; (c) x-ray image magnifier means positioned in the path of the beams downstream from the sample; (d) detecting means for detecting the beams after being passed through and magnified by the image magnifier means; and (e) computing me… more
Date: December 31, 1991
Creator: Kinney, J. H.; Bonse, U. K.; Johnson, Q. C.; Nichols, M. C.; Saroyan, R. A.; Massey, W. N. et al.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Polarizing optics for the soft x-ray regime: Whispering-gallery mirrors and multilayer beamsplitters

Description: Two short-wavelength optical components are described. The first, the whispering-gallery mirror, uses many glancing-incidence reflections to deflect a beam through a large net angle. Because the Fresnel coefficient for each reflection depends upon the state of polarization, the whispering-gallery mirror can act both as a polarizer and as a birefringent element. The second, the multilayer polarizing beamsplitter, is a Brewster-angle reflector thin enough to allow partial partial transmission of … more
Date: December 31, 1991
Creator: Braud, J. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development of the MIT tabletop soft x-ray laser

Description: We have been developing a small-scale EUV laser facility at MIT with which we hope to observe gain in nickel-like molybdenum at 191 {angstrom}. The physics involved in the formation of laser gain is examined through the use of simple models, and optimum operating temperatures and electron densities are determined. The upper state population is determined primarily through a balance between direct collisional excitation to and from the upper laser state; the lower state population follows primar… more
Date: December 31, 1991
Creator: Hagelstein, P. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development and application of local 3-D x-ray CT reconstruction software for imaging critical regions in large ceramic turbine rotors

Description: Current 3-D X-ray CT imaging technology is limited in some cases by the size and sensitivity of the X-ray detector. This limitation can be overcome to some degree by the use of region-of-interest (ROI) reconstruction software when only part of a larger object need be examined. However, images produced from ROI data often exhibit severe density shading if they are reconstructed by unaltered 3-D X-ray CT algorithms (called Global methods here). These density artifacts can be so severe that low-co… more
Date: December 31, 1992
Creator: Sivers, E. A.; Holloway, D. L.; Ellingson, W. A. & Ling, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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