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The Effects of Irradiation on Some Binary Alloys of Thorium-Plutonium and Zirconium-Plutonium

Description: A specimen of cast thorium-5 wt% plutonium and one of thorium-10 wt% plutonium were irradiated to total atom burnups of 1.9 and 2.6%, respectively, at maximum fuel temperatures of approximately 450 deg C. Both alloys displayed excellent dimensional stability with volume increases of 0.8 and 1.2% per atom per cent burnup, respectively. Three cold-rolled specimens of zirconium-5 wt% plutonium and one cold-rolled specimen of zirconium-7 wt% plutonium were also irradiated. The zirconium- plutonium … more
Date: July 1, 1962
Creator: Horak, J. A.; Kittel, J. H. & Rhude, H. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mechanical transport in two-dimensional networks of fractures

Description: The objectives of this research are to evaluate directional mechanical transport parameters for anisotropic fracture systems, and to determine if fracture systems behave like equivalent porous media. The tracer experiments used to measure directional tortuosity, longitudinal geometric dispersivity, and hydraulic effective porosity are conducted with a uniform flow field and measurements are made from the fluid flowing within a test section where linear length of travel is constant. Since fluid … more
Date: April 1, 1984
Creator: Endo, H.K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Transient Temperature Distributions in a Thermally Orthotropic Plate With Non-Uniform Surface Heating

Description: ent temperature variation in a thermally orthotropic plate which is subjected to an arbitrary heating rate distribution along one face with all other surfaces being insulated. Dimensionless temperature histories and distributions determined from this solution are presented for the special, but representative, case of a linearly varying heating rate distribution on plates with varying degrees of thermal orthotropy. These results establish quantitatively the value of a material with high planar a… more
Date: June 1, 1961
Creator: Hornbaker, David Ross
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Angular distributions of photoelectrons and non-thermal photoions from atoms and molecules. [Review]

Description: During the last ten years, photoelectron angular distributions have been used extensively to study the dynamics of the photoionization process in atoms and molecules. Some major advances in this body of work are reviewed with special emphasis on results emerging since the last Conference on VUV Radiation Physics three years ago. By far the greatest progress has occurred for atoms, where interest is focussed on improving zero-order (Hartree-Slater, Cooper-Zare) understanding of the asymmetry par… more
Date: January 1, 1977
Creator: Dehmer, J. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Magnetic multilayer interface anisotropy

Description: Ni/Mo and Ni/V multilayer magnetic anisotropy has been investigated as a function of Ni layer thickness, frequency and temperature. Variable frequency ferromagnetic resonance (FMR) measurements show, for the first time, significant frequency dependence associated with the multilayer magnetic anisotropy. The thickness dependence allows one to extract the interface contribution from the total anisotropy. Temperature dependant FMR (9 GHz) and room temperature magnetization indicate that strain bet… more
Date: January 1, 1991
Creator: Pechan, M. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fundamentals of wetting and spreading with emphasis on soldering

Description: Soldering is often referred to as a mature technology whose fundamentals were established long ago. Yet a multitude of soldering problems persist, not the least of which are related to the wetting and spreading of solder. The Buff-Goodrich approach to thermodynamics of capillarity is utilized in a review of basic wetting principles. These thermodynamics allow a very compact formulation of capillary phenomena which is used to calculate various meniscus shapes and wetting forces. These shapes and… more
Date: January 1, 1991
Creator: Yost, F. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Anisotropy of oxygen tracer diffusion in YBa sub 2 Cu sub 3 O sub 7-. delta. single crystals

Description: The crystal structure of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} strongly suggests that the diffusion of oxygen in this material will be highly anisotropic, with diffusion in the ab plane being much faster than diffusion parallel to the c axis, and this has been assumed in most analyses of diffusion in YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}. The present data confirm this hypothesis; the diffusion coefficient in the ab plane is several orders of magnitude greater than the diffusion coefficient along th… more
Date: September 1, 1989
Creator: Rothman, S. J.; Routbort, J. L.; Liu, J.-Z.; Downey, J. W.; Thompson, L. J.; Fang, Y. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fractal behavior of single-particle trajectories and isosets in isotropic and anisotropic fluids

Description: Molecular dynamics simulations for a variety of systems in 2 spatial dimensions reveal fractual behavior associated with trajectories and isosets of single particle motion. The fractual dimensions of trajectories and isosets are 2 and 0.5, respectively, irrespective of the nature of the interparticle interaction or thermodynamic state of the system. Recently, we have investigated the fractual behavior of diffusing Ag ions in the superionic phase of Ag/sub 2/S. MD calculations have shown that th… more
Date: August 1, 1985
Creator: Kalia, R.K.; Vashishta, P. & de Leeuw, S.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Mossbauer effect and neutron diffraction study of the anomalous lattice behavior of U/sub 6/Fe

Description: Neutron diffraction and /sup 57/Fe Moessbauer effect measurements have been made on the exchange-enhanced superconductor U/sub 6/Fe. The neutron diffraction results indicate a pronounced anisotropy in the thermal expansion of the unit cell and an anomalous temperature dependence for the c-axis component of the total Debye-Waller factor of Fe below 100K. The Moessbauer effect measurements show non-Debye behavior in the mean-squared displacement of Fe, with phonon hardening occurring below 100K. … more
Date: June 1, 1985
Creator: Vaishnava, P. P.; Dwight, A. E.; Kimball, C. W.; Jorgensen, J. D. & Fradin, F. Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Uranium nitride: a cubic antiferromagnet with anisotropic critical behavior

Description: Highly anisotropic critical scattering associated with the transition at T/sub N/ = 49.5 K to the type-I antiferromagnetic structure has been observed in uranium nitride. The transverse susceptibility is found to be unobservably small. The longitudinal susceptibility diverges at T/sub N/ and its anisotropy shows that the spins within the (001) ferromagnetic sheets of the (001) domain are much more highly correlated than they are with the spins lying in adjacent (001) sheets. The correlation ran… more
Date: November 1, 1977
Creator: Buyers, W. J. L.; Holden, T. M.; Svensson, E. C. & Lander, G. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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New Method to Determine the Independent Shear Moduli of Transversely Isotropic Materials

Description: A new and simple method is presented to determine the independent shear moduli of transversely isotropic materials. The method is tested on Green River Formation oil shale, one of such materials. The method is applicable for linear and nonlinear elastic materials. Mathematical formulation, derivation and solution are given, and test apparatus and results are presented. Comparison with other approximate results and acoustical methods are made. Confirmation of the test method with materials havin… more
Date: January 1, 1980
Creator: Chong, K. P.; Chen, J. L.; Uenishi, K. & Smith, J. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Statistical fracture mechanics approach to the strength of brittle rock

Description: Statistical fracture mechanics concepts used in the past for rock are critically reviewed and modifications are proposed which are warranted by (1) increased understanding of fracture provided by modern fracture mechanics and (2) laboratory test data both from the literature and from this research. Over 600 direct and indirect tension tests have been performed on three different rock types; Stripa Granite, Sierra White Granite and Carrara Marble. In several instances assumptions which are commo… more
Date: June 1, 1981
Creator: Ratigan, J.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fusion reaction spectra produced by anisotropic fast ions in the PLT tokamak

Description: For beam-target fusion reactions, collimated measurements of the energy spectrum of one of the reaction products can provide information on the degree of anisotropy of the reacting beam ions. Measurements of the spectrum of 15 MeV protons produced by reactions between energetic /sup 3/He ions and relatively cold deuterons during fast wave minority heating in the PLT tokamak indicate that the velocity distribution of fast /sup 3/He ions is peaked perpendicular to the tokamak magnetic field.
Date: February 1, 1984
Creator: Heidbrink, W. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Measurement of the large-scale anisotropy of the cosmic background radiation at 3mm

Description: A balloon-borne differential radiometer has measured the large-scale anisotropy of the cosmic background radiation (CBR) with high sensitivity. The antenna temperature dipole anistropy at 90 GHz (3 mm wavelength) is 2.82 +- 0.19 mK, corresponding to a thermodynamic anistropy of 3.48 +- mK for a 2.7 K blackbody CBR. The dipole direction, 11.3 +- 0.1 hours right ascension and -5.7/sup 0/ +- 1.8/sup 0/ declination, agrees well with measurements at other frequencies. Calibration error dominates mag… more
Date: December 1, 1983
Creator: Epstein, G.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Misspecification of trend in spatial random-function interpolation with application to oxidant mapping. Technical report No. 28

Description: In epidemiological studies of the effects of air pollution it is desirable to obtain estimates of the exposure to various pollutants of persons living throughout a geographical region under study. It is typically the case that pollution levels are measured at only a few locations. The problems of interpolating these values and of determining the accuracy of interpolation are amenable to analysis by way of spatial stochastic models. Such models can lead to an optimal interpolation technique, in … more
Date: September 1, 1979
Creator: Faith, Ray & Sheshinski, Ruth
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Special core analysis for western tight sands. Project 61031 annual report, August 1, 1980-July 31, 1981

Description: This report presents the results of laboratory investigations of low-permeability sandstones at the Institute of Gas Technology (IGT), Chicago. The core samples used in these studies were from the following wells: (1) Mapco RBU 11-17F well from the Uinta Basin, Utah; and (2) PTS 24-19 Federal from Sublette County, Wyoming. Core samples from the Greater Green River Basin in Wyoming were also used in some of the experiments. Permeability to gas was measured as a function of pore pressure, confini… more
Date: January 1, 1982
Creator: Sampath, K. & Rose, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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