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Quantitative study of mixing in annular and raschig ring filled tanks

Description: A quantitative study of mixing, which utilized the exit age distribution theory, has been completed for bench-scale annular and raschig ring filled tanks, in addition to a pilot-scale annular tank. A study of mixing and fluid flow in a full-scale, single-entry, raschig ring filled tank also was initiated. Results showed the bench-scale raschig ring filled tank approached plug-flow (no mixing) behavior. In a bench-scale annular tank, regardless of whether fluid entered tangentially or nontangent… more
Date: July 14, 1980
Creator: Fredrickson, M. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Capture cross section and gamma-ray spectrum calculations for medium-weight nuclei. [Double-peak, energy-dependent Breit-Wigner model]

Description: A double-peak, energy-dependent Breit-Wigner model of the E1 gamma-ray strength function was applied to nuclei from As to Rh, to predict their neutron capture cross sections and capture gamma-ray spectra. A consistent set of model parameters was obtained in this mass region to describe the step in the low-energy tail of the E1 strength function. This step allows agreement with photonuclear data at high energies, the correct GAMMA/sub gamma/ to be obtained for agreement with neutron capture cros… more
Date: November 14, 1979
Creator: Gardner, M. A. & Gardner, D. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Equilibrium panel surface temperatures in the SNAP-2 instrument compartment

Description: By equating net radiation to space to I/sup 2/R heating in the SNAP-2 instrument compartments, and neglecting internal radiation between compartments, the panel surface equilibrium temperatures were computed for hot and cold temperature extremes. These extremes are defined by: (1) cold - pre-start phase in the shade, (2) hot - full power phase facing the sun. The results of the heat balances for hottest and coldest cases are presented graphically. These figures relate the equilibrium surface te… more
Date: September 14, 1962
Creator: Gresho, P. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Integrated system of production of neutronics and photonics calculational constants. Volume 21, Part A. Maxwell-averaged reaction rates (sigma v-bar) for selecteed reactions between ions with atomic mass less than or equal to 11

Description: Maxwell-averaged reaction rates (sigma v-bar) are presented for 24 interactions between /sup 1/H, /sup 2/H, /sup 3/H, /sup 3/He, /sup 4/He, /sup 6/Li, /sup 7/Li, /sup 10/B, and /sup 11/B ions. The reactions rates are calculated by use of the evaluated data of the LLL Evaluated Nuclear Data Library (ENDL). 5 figures, 5 tables.
Date: February 14, 1979
Creator: Howerton, Robert J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Transient two-dimensional flow in porous media

Description: The transient flow of an isothermal ideal gas from the cavity formed by an underground nuclear explosion is investigated. A two-dimensional finite element method is used in analyzing the gas flow. Numerical results of the pressure distribution are obtained for both the stemming column and the surrounding porous media.
Date: September 14, 1979
Creator: Sharpe, L. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Energy deposition by high energy protons: comparison of theory and experiment. [HETC computer code]

Description: The ability of the HETC computer code to calculate energy deposited by proton beams of 0.8 to 28.5 GeV in composite targets was evaluated by comparing calculated results with experimental data. The experimental assembly consisted of /sup 238/U shower plates separated by an air gap from a CH/sub 2///sup 238/U detector plate. For protons in the range 0.8 to 5 GeV, HETC data on energy deposited can be considered accurate to a few tens of percent or better for the shower-plate part of the assembly … more
Date: May 14, 1980
Creator: Loewe, W. E. & Pollock, C. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Nonlinear hydrodynamics. Lecture 9

Description: A very sophisticated method for calculating the stability and pulsations of stars which make contact with actual observations of the stellar behavior, hydrodynamic calculations are very simple in principle. Conservation of mass can be accounted for by having mass shells that are fixed with their mass for all time. Motions of these shells can be calculated by taking the difference between the external force of gravity and that from the local pressure gradient. The conservation of energy can be c… more
Date: March 14, 1983
Creator: Cox, A. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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First order comparison of numerical calculation and two different turtle input schemes to represent a SLC defocusing magnet

Description: Correcting the dispersion function in the SLC north arc it turned out that backleg-windings (BLW) acting horizontally as well as BLW acting vertically have to be used. In the latter case the question arose what is the best representation of a defocusing magnet with excited BLW acting in the vertical plane for the computer code TURTLE. Two different schemes, the 14.-scheme and the 20.-scheme were studied and the TURTLE output for one ray through such a magnet compared with the numerical solution… more
Date: July 14, 1983
Creator: Jaeger, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Engineered Barrier System performance requirements systems study report. Revision 02

Description: This study evaluates the current design concept for the Engineered Barrier System (EBS), in concert with the current understanding of the geologic setting to assess whether enhancements to the required performance of the EBS are necessary. The performance assessment calculations are performed by coupling the EBS with the geologic setting based on the models (some of which were updated for this study) and assumptions used for the 1995 Total System Performance Assessment (TSPA). The need for enha… more
Date: January 14, 1997
Creator: Balady, M. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Calculation of thermal diffuse scattering

Description: The authors developed a computer program to calculate the thermal diffuse scattering (TDS) intensity distribution for single crystal specimens in a diffractometer with no energy analysis. They assumed that the phonon frequencies are approximated by those of elastic waves and that the elastic constants, density and lattice parameters of the system under study are known. The results of the calculations were compared to experimental data obtained for single crystals of Si, diamond and NiAl at the … more
Date: July 14, 1997
Creator: Wakabayashi, N.; Nicklow, R. M.; Child, H. R.; Smith, H. G.; Fernandez-Baca, J. A.; Katano, S. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Final Report on Advanced Steel Reheat Furnaces Research and Development

Description: The purpose of this report is to present the results of two phases of a three-phase project to develop and evaluate an Advanced Steel Reheat Furnace (SSRF) concept which incorporates two proven and commercialized technologies, oxy-fuel enriched air (OEA) combustion and gas reburning (GR). The combined technologies aim to improve furnace productivity with higher flame radiant heat transfer in the heating zones of a steel reheat furnace while controlling potentially higher NOx emissions from thes… more
Date: January 14, 1999
Creator: Nguyen, Q.; Koppang, R.; Maly, P.; Moyeda, D. & Li, X.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Gradient-driven diffusion using dual control volume grand canonical molecular dynamics

Description: The dual control volume grand canonical molecular dynamics (DCV-GCMD) method, designed to enable the dynamic simulation of a system with a steady state chemical potential gradient is first briefly reviewed. A new, novel implementation of the method which enables the establishment of a steady state chemical potential gradient in a multicomponent system without having to insert or delete one of the components is then presented and discussed.
Date: June 14, 1998
Creator: Thompson, A. M.; Ford, D. M. & Heffelfinger, G. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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f{sub B} and f{sub B{sub s}} using NRQCD

Description: The authors present results from a calculation of f{sub B} and f{sub B{sub s}} in the quenched approximation. The heavy quark is simulated using an O(1/M{sup 2}) improved NRQCD action, and the tadpole improved clover action is used for the light quarks. The axial current includes the O(1/M) corrections in one-loop perturbation theory and the O(1/M{sup 2}) ones at tree-level. The authors find f{sub B}=152(11)({sup +8}{sub {minus}12})(9)(6) MeV, f{sub B{sub s}}=181(8)({sup +7}{sub {minus}0})(11)(… more
Date: July 14, 1998
Creator: Bhattacharya, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Theoretical Energy Release of Thermites, Intermetallics, and Combustible Metals

Description: Thermite mixtures, intermetallic reactants, and metal fuels have long been used in pyrotechnic applications. Advantages of these systems typically include high energy density, high combustion temperature, and a wide range of gas production. They generally exhibit high temperature stability and possess insensitive ignition properties. For the specific applications of humanitarian demining and disposal of unexploded ordnance, these pyrotechnic formulations offer additional benefits. The combinati… more
Date: May 14, 1999
Creator: Fischer, S.H. & Grubelich, M.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Model Etch Profiles for Ion Energy Distribution Functions in an Inductively Coupled Plasma Reactor

Description: Rectangular trench profiles are modeled with analytic etch rates determined from measured ion distribution functions. The pattern transfer step for this plasma etch is for trilayer lithography. Argon and chlorine angular ion energy distribution functions measured by a spherical collector ring analyzer are fit to a sum of drifting Maxwellian velocity distribution functions with anisotropic temperatures. The fit of the model ion distribution functions by a simulated annealing optimization procedu… more
Date: December 14, 1998
Creator: Abraham-Shrauner, B.; Chen, W. & Woodworth, J.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Localized hole effects in inner-shell excitation

Description: Ab initio calculations of valence shell ionization potentials have shown that orbital relaxation and correlation differences usually make contributions of comparable magnitude. In marked contrast to this observation is the situation for deep core ionization, where correlation differences (approx. 1 eV) play a relatively minor role compared to orbital relaxation (approx. 20 eV). Theoretical calculations have shown that this relaxation is most easily described if the 1s-vacancy created by a K-she… more
Date: October 14, 1983
Creator: Rescigno, T. N. & Orel, A. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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