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118
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82
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48
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619 Matching Results
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Recovery of Uranium From High Grade Australian Rum Jungle Uranium Ore
The leaching behavior, thickening and filtering characteristics and recovery of uranium from high grade uranium ore from Rum Jungle, Northern Territory, Australia are described.
Date:
August 22, 1952
Creator:
George, D'Arcy R.
Object Type:
Report
System:
The UNT Digital Library
Improved Calibration Facility
Aid in redesign of the calibration facility in order to: 1. Reduce the rate of exposure for calibration personnel below 1 mr/hr; 2. Reduce the rate of exposure outside of the 3745 Building; 3. Reduce the risk of breaking radium sources; 4. Improve the efficiency of calibration procedures by: a. Allowing calibration to be done faster; b. Providing several calibration ranges which can operate simultaneously in the present space allowed; c. Allowing instrument survey work to proceed while calibration work is done. A well-type calibration installation is proposed and a brief description of the required shielding is included.
Date:
August 22, 1995
Creator:
Roesch, W. C.
Object Type:
Report
System:
The UNT Digital Library
Magnetic Core Tests for Pulsed Operation at 30 Nanoseconds Pulse Width
The magnetic properties of core materials ae investigated for a pulse width of 30 nanoseconds. Methods of testing which are necessitated by the sort pulse width are explained and the design of the pulser which is capable of 0.2 megawatt peak power is described. The data obtained if evaluated and presented for the various materials which were tested.
Date:
August 22, 1960
Creator:
Reeser, Gilbert A.
Object Type:
Report
System:
The UNT Digital Library
Cultivator Foot
Patent for a cultivator foot. This cultivator foot is designed to be a new kind of inexpensive, simple, and efficient cultivator foot.
Date:
August 22, 1922
Creator:
Dawson, Joseph E.
Object Type:
Patent
System:
The Portal to Texas History
Shutter for Motion-Picture Machines.
Patent for a shutter for motion picture cameras to eliminate flickering. Produced by stamping the device from sheet metal.
Date:
August 22, 1922
Creator:
Patureau, Arthur M.
Object Type:
Patent
System:
The Portal to Texas History
The Effects of Fast Neutrons on the Ability of Mice to Take Forced Exercise
From abstract: "In an attempt to gain some insight into the physiological condition of mice surviving massive doses of radiation, a study of their vitality was undertaken. It was assured that the ability of these animals to do forced work would be a measure of their vitality, Stimulating exposed animals to run in exercise wheels to their fullest capacity, has resulted in a demonstration of a striking vitality less during a post-irradiative period, when no other effects are demonstrable by gross examination. Mice subjected to a medium-lethal dose of fast neutrons show a continuous vitality loss over a 300 day period following exposure. Control animals show no appreciable loss of vitality up to about 8 months of age, after which a gradual loss can be noted, probably due to a normal gereologic process."
Date:
August 22, 1946
Creator:
Stapleton, G. K. & Curtis, H. J.
Object Type:
Report
System:
The UNT Digital Library
Plasma production and flow in ion beams
Space charge neutralization of ion beams results from plasma generated by the beam. The two dimensional flow of plasma to walls surrounding a beam is analyzed to provide spatial distributions. Negative ion beams receive particular attention; the results are applied to electron control in beams subject to post-acceleration.
Date:
August 22, 1977
Creator:
Hooper, Jr. E. B. & Willmann, P. A.
Object Type:
Report
System:
The UNT Digital Library
Computational Quantum Chemistry [Website]
This report contains the contents of a web page related to research on the development of quantum chemistry methods for computational thermochemistry and the application of quantum chemistry methods to problems in material chemistry and chemical sciences. Research programs highlighted include: Gaussian-2 theory; Density functional theory; Molecular sieve materials; Diamond thin-film growth from buckyball precursors; Electronic structure calculations on lithium polymer electrolytes; Long-distance electronic coupling in donor/acceptor molecules; and Computational studies of NOx reactions in radioactive waste storage.
Date:
August 22, 1997
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Texas Preventable Disease News, Volume 47, Number 33, August 22, 1987
Newsletter of the Texas Bureau of Disease Control and Epidemiology discussing the news, activities, and events of the organization and other information related to health in Texas.
Date:
August 22, 1987
Creator:
Texas. Bureau of Disease Control and Epidemiology.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Studies of time dependence of fields in TEVATRON superconducting dipole magnets
The time variation in the magnetic field of a model Tevatron dipole magnet at constant excitation current has been studied. Variations in symmetry allowed harmonic components over long time ranges show a log t behavior indicative of ''flux creep.'' Both short time range and long time range behavior depend in a detailed way on the excitation history. Similar effects are seen in the remnant fields present in full-scale Tevatron dipoles following current ramping. Both magnitudes and time dependences are observed to depend on details for the ramps, such as ramp rate, flattop duration, and number of ramps. In a few magnets, variations are also seen in symmetry unallowed harmonics. 9 refs., 10 figs.
Date:
August 22, 1988
Creator:
Hanft, R. W.; Brown, B. C.; Herrup, D. A.; Lamm, M. J.; McInturff, A. D. & Syphers, M. J.
Object Type:
Article
System:
The UNT Digital Library
Hohlraum-Driven Ignition-Like Double-Shell Implosion Experiments on Omega: Analysis and Interpretation
An experimental campaign to study hohlraum-driven ignition-like double-shell target performance using the Omega laser facility has begun. These targets are intended to incorporate as many ignition-like properties of the proposed National Ignition Facility (NIF) double-shell ignition design [1,2] as possible, given the energy constraints of the Omega laser. In particular, this latest generation of Omega double-shells is nominally predicted to produce over 99% of the (clean) DD neutron yield from the compressional or stagnation phase of the implosion as required in the NIF ignition design. By contrast, previous double-shell experience on Omega [3] was restricted to cases where a significant fraction of the observed neutron yield was produced during the earlier shock convergence phase where the effects of mix are deemed negligibly small. These new targets are specifically designed to have optimized fall-line behavior for mitigating the effects of pusher-fuel mix after deceleration onset and, thereby, providing maximum neutron yield from the stagnation phase. Experimental results from this recent Omega ignition-like double-shell implosion campaign show favorable agreement with two-dimensional integrated hohlraum simulation studies when enhanced (gold) hohlraum M-band (2-5 keV) radiation is included at a level consistent with observations.
Date:
August 22, 2003
Creator:
Amendt, P.; Robey, H. F.; Park, H. S.; Tipton, R. E.; Turner, R. E.; Milovich, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Applications of Computational Fluid Dynamics Simulations in Urban Environments and Experiments Designed to Aid the Development and Evaluation of these Models
Progress in development of CFD models has shown their great potential for prediction of air flow, heat dissipation, and dispersion of air pollutants in the urban environment. Work at Lawrence Livermore National Laboratory has progressed using the finite element code FEM3 which has been ''massively parallelized'' to produce flow fields and pollutant dispersion in a grid encompassing many city blocks and with high resolution. While it may be argued that urban CFD models are not yet economical for emergency response applications, there are many applications in assessments and air quality management where CFD models are unrivaled in the level of detail that they provide. We have conducted field experiments to define the flow field and air tracer dispersion around buildings as a means of critiquing and evaluating the CFD models. The first experiment, the ''B170 study'', was a study of flow field, turbulence, and tracer dispersion in separation zones around a complex, single building. The second was the URBAN 2000 experiment in downtown Salt Lake City where flow fields and tracers were studied in nested resolution from the single building scale up to larger scales of 25 city blocks, and out to 6 km. For the future an URBAN 2003 …
Date:
August 22, 2001
Creator:
Shinn, J & Gouveia, F J
Object Type:
Article
System:
The UNT Digital Library
April 2002 Working Group Meeting on Heavy Vehicle Aerodynamic Drag: Presentations and Summary of Comments and Conclusions
A Working Group Meeting on Heavy Vehicle Aerodynamic Drag was held at Lawrence Livermore National Laboratory on April 3 and 4, 2002. The purpose of the meeting was to present and discuss technical details on the experimental and computational work in progress and future project plans. Representatives from the Department of Energy (DOE) Office of Transportation Technology Office of Heavy Vehicle Technology (OHVT), Lawrence Livermore National Laboratory (LLNL), Sandia National Laboratories (SNL), NASA Ames Research Center, University of Southern California (USC), and California Institute of Technology (Caltech), Georgia Tech Research Institute (GTRI), and Argonne National Laboratory (ANL), Volvo Trucks, and Freightliner Trucks presented and participated in discussions. This report contains the technical presentations (viewgraphs) delivered at the Meeting, briefly summarizes the comments and conclusions, and outlines the future action items.
Date:
August 22, 2002
Creator:
Salari, K.; Dunn, T.; Ortega, J.; Yen-Nakafuji, D.; Browand, F.; Arcas, D. et al.
Object Type:
Report
System:
The UNT Digital Library
A Strategy to Assess Performance of Selected Low-Activity Waste Forms in an Integrated Disposal Facility
An overall strategy for evaluating the long-term performance of three waste forms being considered for supplemental treatment of low-activity waste at Hanford is discussed. The same computational framework used to conduct the 2001 ILAW performance assessment will be used for all three waste forms. Cast stone will be modeled with a diffusion-advection transport model and bulk vitrified glass and steam reformed LAW will be modeled with a reactive chemical transport simulator. The recommended laboratory testing to support the supplemental LAW form selection includes single-pass flow-through (SPFT), product consistency (PCT), and vapor hydration tests for glass, SPFT and PCT tests for steam reformed LAW forms, and ANS 16.1 tests for cast stone. These and potentially other laboratory tests for the selected waste form(s) would also be the basis for more detailed studies needed to support a comprehensive long-term performance assessment should one or more of these waste forms be selected for disposal in an integrated disposal facility.
Date:
August 22, 2003
Creator:
McGrail, B PETER.; Bacon, Diana H.; Serne, R JEFFREY. & Pierce, Eric M.
Object Type:
Report
System:
The UNT Digital Library
Stimulated Brillouin Scattering from Helium-Hydrogen Plasmas
An extensive study of the stimulated Brillouin scattering (SBS) in helium-hydrogen plasmas has been performed using a gas jet at the Janus Laser Facility. We observe three regions of reflectivity by varying the probe intensity from 10{sup 14} to 10{sup 16}: saturated region, linear region, and near SBS threshold region. In the linear regime, adding small amounts of H to a He plasma reduces the SBS reflectivity by a factor of 4.
Date:
August 22, 2003
Creator:
Froula, D. H.; Divol, L.; Price, D.; Gregori, G.; Williams, E. A. & Glenzer, S. H.
Object Type:
Article
System:
The UNT Digital Library
Experimental Studies of Simultaneous 351 nm and 527 nm Laser Beam Interactions in a Long Scalelength Plasma
We describe experiments investigating the simultaneous backscattering from 351 nm (3w) and 527 nm (2w) interaction beams in a long scalelength laser-produced plasma for intensities {le} 1 x 10{sup 15} W/cm{sup 2}. Measurements show comparable scattering fractions for both color probe beams. Time resolved spectra of stimulated Raman and Brillouin scattering (SRS and SBS) indicate the effects of laser intensity and smoothing as well as plasma composition and parameters on the scattering levels.
Date:
August 22, 2003
Creator:
Moody, J. D.; Divol, L.; Glenzer, S. H.; MacKinnon, A. J.; Froula, D. H.; Gregori, G. et al.
Object Type:
Article
System:
The UNT Digital Library
Unstable crack motion is predictable
Yoffe's linear theory of dynamic brittle fracture suggests that crack motion will be unstable beyond {approx}70% of the Rayleigh speed, a prediction that is not supported by experiment. We show by atomistic simulations that hyperelasticity, the elasticity of large strains, plays a governing role in the instability dynamics of brittle fracture. A simple scaling model based on an effective elastic modulus, coupled with Yoffe's solution, gives successful predictions for the onset speed of the crack instability.
Date:
August 22, 2004
Creator:
Abraham, F
Object Type:
Article
System:
The UNT Digital Library
Review of Geophysical Techniques to Define the Spatial Distribution of Subsurface Properties or Contaminants
This is a letter report to Fluor Hanford, Inc. The purpose of this report is to summarize state-of-the-art, minimally intrusive geophysical techniques that can be used to clarify subsurface geology, structure, moisture, and chemical composition. The technology review focused on geophysical characterization techniques that provide two- or three-dimensional information about the spatial distribution of subsurface properties and/or contaminants.
Date:
August 22, 2005
Creator:
Murray, Christopher J.; Last, George V. & Truex, Michael J.
Object Type:
Report
System:
The UNT Digital Library
Time-Reversal Acoustics and Maximum-Entropy Imaging
Target location is a common problem in acoustical imaging using either passive or active data inversion. Time-reversal methods in acoustics have the important characteristic that they provide a means of determining the eigenfunctions and eigenvalues of the scattering operator for either of these problems. Each eigenfunction may often be approximately associated with an individual scatterer. The resulting decoupling of the scattered field from a collection of targets is a very useful aid to localizing the targets, and suggests a number of imaging and localization algorithms. Two of these are linear subspace methods and maximum-entropy imaging.
Date:
August 22, 2001
Creator:
Berryman, James G.
Object Type:
Article
System:
The UNT Digital Library
Measurement of Heat Propagation in a Laser Produced Plasma
We present the observation of a nonlocal heat wave by measuring spatially and temporally resolved electron temperature profiles in a laser produced nitrogen plasma. Absolutely calibrated measurements have been performed by resolving the ion-acoustic wave spectra across the plasma volume with Thomson scattering. We find that the experimental electron temperature profiles disagree with flux-limited models, but are consistent with transport models that account for the nonlocal effects in heat conduction by fast electrons.
Date:
August 22, 2003
Creator:
Gregori, G.; Glenzer, S. H.; Knight, J.; Niemann, C.; Price, D.; Froula, D. H. et al.
Object Type:
Article
System:
The UNT Digital Library
Experimental Studies of Convection Effects in a Cryogenic NIF Ignition Target
We describe experiments which investigate convection effects on hydrogen ice layers in a transparent CH capsule suspended with a fill-tube. These experiments validate simulations which show that unmitigated convection from the hohlraum fill gas can produce significant distortions to the cryogenic hydrogen ice layer. Experimental results show good agreement with thermal simulations which include conduction and convection.
Date:
August 22, 2003
Creator:
Moody, J. D.; Sanchez, J. J.; Bittner, D. N.; Giedt, W. H.; London, R. L.; Sater, J. D. et al.
Object Type:
Article
System:
The UNT Digital Library
Deuterium Accelerator for Neutron Radiography
None
Date:
August 22, 2001
Creator:
Rusnak, Brian; Hall, James & Hibbard, Wilthea
Object Type:
Article
System:
The UNT Digital Library
High Bandwidth Short Stroke Rotary Fast Tool Servo
This paper presents the design and performance of a new rotary fast tool servo (FTS) capable of developing the 40 g's tool tip acceleration required to follow a 5 micron PV sinusoidal surface at 2 kHz with a planned accuracy of 50 nm, and having a full stroke of 50 micron PV at lower frequencies. Tests with de-rated power supplies have demonstrated a closed-loop unity-gain bandwidth of 2 kHz with 20 g's tool acceleration, and we expect to achieve 40 g's with supplies providing {+-} 16 Amp to the Lorentz force actuator. The use of a fast tool servo with a diamond turning machine for producing non-axisymmetric or textured surfaces on a workpiece is well known. Our new rotary FTS was designed to specifically accommodate fabricating prescription textured surfaces on 5 mm diameter spherical target components for High Energy Density Physics experiments on the National Ignition Facility Laser (NIF).
Date:
August 22, 2003
Creator:
Montesanti, R C & Trumper, D L
Object Type:
Article
System:
The UNT Digital Library
Experimental Investigation of the Effect of M-Band Preheating in Indirectly-Driven Double-Shell Implosions
Experimental results are presented from several series of experiments studying the effect of 2-4 keV M-shell radiation on the implosion of double-shell capsules on the Omega Laser at the Laboratory for Laser Energetics. In the First series of experiments, precision machined double-shell capsules implosions are performed. A discrepancy is observed between the experimentally measured M-band fraction and the simulated value. The application of a time-dependent multiplier to the simulated M-band level results in a decrease in predicted yield of 35% and a corresponding increase in the YoC to 20-35%. In order to further investigate this discrepancy, a series of ''M-Band driven'' targets has been designed. An oversized outer shell is used to preferentially allow the M-band radiation to drive the implosion of a CH-tamped glass inner shell. The inner shell radius-time history is measured and is shown to be consistent with the simulations using the time-dependent M-band multipliers. The spatial distribution of this M-band source is also varied using hohlraums of different length and adjusting the laser pointing accordingly. The resulting asymmetry of the inner shell implosion is diagnosed both by x-ray backlighting prior to shell collision and by core emission.
Date:
August 22, 2003
Creator:
Robey, H. F.; Amendt, P. A.; Park, H. S.; Landen, O. L.; Watt, R. G. & Varnum, W. S.
Object Type:
Article
System:
The UNT Digital Library