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Variational formulation of the Gardner's restacking algorithm
The incompressibility of the phase flow of Hamiltonian wave-plasma interactions restrains the class of realizable wave-driven transformations of the particle distribution. After the interaction, the distribution remains composed of the original phase-space elements, or local densities, which are only rearranged (''restacked'') by the wave. A variational formalism is developed to study the corresponding limitations on the energy and momentum transfer. A case of particular interest is a toroidal plasma immersed in a dc magnetic field. The restacking algorithm by Gardner [Phys. Fluids 6, 839 (1963)] is formulated precisely. The minimum energy state for a plasma with a given current is determined
Date:
April 26, 2004
Creator:
Dodin, I. Y. & Fisch, N. J.
Object Type:
Report
System:
The UNT Digital Library
Formaldehyde Absorption toward W51
We have measured formaldehyde (H{sub 2}CO) absorption toward the HII region complex W51A (G49.5-0.4) in the 6 cm and 2 cm wavelength rotational transitions with angular resolution of approximately 4 inch. The continuum HII region shows a large, previously undetected shell structure 5.5 pc along the major axis. We observe no H{sub 2}CO emission in regions of low continuum intensity. The absorption, converted to optical depth, shows a higher degree of clumping than previous maps at lower resolution. The good S/N of the maps allows accurate estimation of the complicated line profiles, showing some of the absorbing clouds to be quite patchy. We list the properties of the opacity spectra for a number of positions both in the clumps and in the more diffuse regions of the absorbing clouds, and derive column densities for the 1{sub 11} and 2{sub 12} rotational levels of ortho-formaldehyde.
Date:
April 1, 1988
Creator:
Kogut, A.; Smoot, G. F.; Bennett, C. L. & Petuchowski, S. J.
Object Type:
Article
System:
The UNT Digital Library
Texas Attorney General Opinion: C-416
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Travel expense of State employees in returning to headquarters daily or on weekends.
Date:
April 6, 1965
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Optical assessment of large marine particles: Development of an imaging and analysis system for quantifying large particle distributions and fluxes. Final report, June 1992--May 1996
The central goal of DOE`s Ocean Margin Program (OMP) has been to determine whether continental shelves are quantitatively significant in removing carbon dioxide from the atmosphere and isolating it via burial in sediments or exporting it to the open ocean. The overall objective of this work within OMP was to develop an instrument package to measure the large aggregate population of particles in the shelf/slope environment at a rate sufficient to integrate the observed particle distributions into the coupled physical and biogeochemical models necessary to understand the shelf and slope as a system. Pursuant to this the authors have developed a video and optical instrument package (LAPS: Large Aggregate Profiling System) and assembled the computer and software methods to routinely measure a wide spectrum of the large aggregate population of particles in the shelf/slope environment. This particle population, encompassing the `marine snow` size particles (dia. > 0.5 mm), is thought to be the major pathway of material flux in the ocean. The instrument package collects aggregate abundance and size spectrum data using two video camera/strobe subsystems with a third subsystem collecting CTD, beam attenuation and fluorescence data. Additionally, measurements of particle flux were made with sediment traps deployed on the …
Date:
April 1, 1997
Creator:
Walsh, I. D. & Gardner, W. D.
Object Type:
Report
System:
The UNT Digital Library
Notes on Switching between Proton and gold Operation in Booster and AGS
N/A
Date:
April 1, 2000
Creator:
Ahrens, L. A. & Gardner, C. J.
Object Type:
Report
System:
The UNT Digital Library
Recess Appointments Made by President George W. Bush
None
Date:
April 15, 2009
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Neutron reactions on $sup 239$U
None
Date:
April 24, 1975
Creator:
Gardner, D. G.
Object Type:
Report
System:
The UNT Digital Library
Preliminary Results on the Kinetic Behavior of Water Boiler Reactors
None
Date:
April 15, 1957
Creator:
Hetrick, D. L.; Flora, J. W.; Gardner, E. L.; Moskowitz, B. R.; Muller, D. R.; Remley, M. E. et al.
Object Type:
Report
System:
The UNT Digital Library
Scientific drilling in the Valles caldera magma-hydrothermal system, New Mexico
None
Date:
April 1, 1994
Creator:
Goff, F.; Gardner, J. N.; Heiken, G. & Hulen, J. B.
Object Type:
Report
System:
The UNT Digital Library
Current status of fast-neutron-capture calculations
This work is primarily concerned with the calculation of neutron capture cross sections and capture gamma-ray spectra, in the framework of the Hauser-Feshbach statistical model and for neutrons from the resonance region up to several MeV. An argument is made that, for applied purposes such as constructing evaluated cross-section libraries, nonstatistical capture mechanisms may be completely neglected at low energies and adequately approximated at high energies in a simple way. The use of gamma-ray strength functions to obtain radiation widths is emphasized. Using the reaction /sup 89/Y + n as an example, the problems encountered in trying to construct a case that could be run equivalently on two different nuclear reaction codes are illustrated, and the effects produced by certain parameter variations are discussed.
Date:
April 15, 1982
Creator:
Gardner, D. G.
Object Type:
Article
System:
The UNT Digital Library
Report on the Carpenter Ridge District, Dolores Plateau Area, Colorado: [Figures and Calculations]
Index maps, detail figures, columnar sections, and calculation tables for the Carpenter Ridge District.
Date:
April 12, 1988
Creator:
Miller, Gardner B.
Object Type:
Report
System:
The UNT Digital Library
HAMMER COURSEWARE MANAGEMENT SYSTEM (CMS) SYSTEM DEVELOPMENT AND IMPLEMENTATION
HAMMER Courseware Management System (HAMMERCMS) is the official name of the system Fluor Hanford, Inc., uses to facilitate development of, deliver, and track training presented in some electronic form (mainly, web-based training) to Hanford Site employees, subcontractors, and vendors.
Date:
April 28, 2006
Creator:
GARDNER, P.R.
Object Type:
Article
System:
The UNT Digital Library
Physical and Mechanical Metallurgy Studies on Delta-Stabilized Plutonium- Gallium Alloys
None
Date:
April 1, 1965
Creator:
Gardner, H. R.
Object Type:
Report
System:
The UNT Digital Library
Mining Program: Bureau of Mines Oil-Shale Project, Rifle, Colorado
Report issued by the Bureau of Mines on the development of efficient mining methods for producing oil shale. Characteristics of the oil shale deposits of the Green River are presented. The results of core drilling and sampling in this area are also listed. This report includes tables, illustrations, maps, and photographs.
Date:
April 1948
Creator:
Gardner, E. D.
Object Type:
Report
System:
The UNT Digital Library
SUDOKU A STORY & A SOLVER
Sudoku, also known as Number Place, is a logic-based placement puzzle. The aim of the puzzle is to enter a numerical digit from 1 through 9 in each cell of a 9 x 9 grid made up of 3 x 3 subgrids (called ''regions''), starting with various digits given in some cells (the ''givens''). Each row, column, and region must contain only one instance of each numeral. Completing the puzzle requires patience and logical ability. Although first published in a U.S. puzzle magazine in 1979, Sudoku initially caught on in Japan in 1986 and attained international popularity in 2005. Last fall, after noticing Sudoku puzzles in some newspapers and magazines, I attempted a few just to see how hard they were. Of course, the difficulties varied considerably. ''Obviously'' one could use Trial and Error but all the advice was to ''Use Logic''. Thinking to flex, and strengthen, those powers, I began to tackle the puzzles systematically. That is, when I discovered a new tactical rule, I would write it down, eventually generating a list of ten or so, with some having overlap. They served pretty well except for the more difficult puzzles, but even then I managed to develop an …
Date:
April 1, 2006
Creator:
GARDNER, P.R.
Object Type:
Article
System:
The UNT Digital Library
Prompt Gamma-Ray Neutron Activation Analysis (PGNAA) for Elemental Analysis
This research project was to improve the prompt gamma-ray neutron activation analysis (PGNAA) measurement approach for bulk analysis, oil well logging, and small sample thermal enutron bean applications.
Date:
April 11, 2006
Creator:
Gardner, Robin P.
Object Type:
Report
System:
The UNT Digital Library
Bioinformatics for Diagnostics, Forensics, and Virulence Characterization and Detection
We summarize four of our group's high-risk/high-payoff research projects funded by the Intelligence Technology Innovation Center (ITIC) in conjunction with our DHS-funded pathogen informatics activities. These are (1) quantitative assessment of genomic sequencing needs to predict high quality DNA and protein signatures for detection, and comparison of draft versus finished sequences for diagnostic signature prediction; (2) development of forensic software to identify SNP and PCR-RFLP variations from a large number of viral pathogen sequences and optimization of the selection of markers for maximum discrimination of those sequences; (3) prediction of signatures for the detection of virulence, antibiotic resistance, and toxin genes and genetic engineering markers in bacteria; (4) bioinformatic characterization of virulence factors to rapidly screen genomic data for potential genes with similar functions and to elucidate potential health threats in novel organisms. The results of (1) are being used by policy makers to set national sequencing priorities. Analyses from (2) are being used in collaborations with the CDC to genotype and characterize many variola strains, and reports from these collaborations have been made to the President. We also determined SNPs for serotype and strain discrimination of 126 foot and mouth disease virus (FMDV) genomes. For (3), currently >1000 probes …
Date:
April 5, 2005
Creator:
Gardner, S & Slezak, T
Object Type:
Article
System:
The UNT Digital Library
Report for Detection of Biothreat Agents and Environmental Samples using the LLNL Virulence Array for DHS
None
Date:
April 18, 2011
Creator:
Jaing, C; Gardner, S; McLoughlin, K; Thissen, J & Jackson, P
Object Type:
Report
System:
The UNT Digital Library
Observations on an aileron-flutter instability encountered on a 45 degree swept-back wing in transonic and supersonic flight
Report presenting a flight test of a supersonic research pilotless aircraft in which large-amplitude aileron oscillations, most likely aileron compressibility flutter, were encountered in the transonic and supersonic speed ranges. Results regarding power-on flight and coasting flight are provided.
Date:
April 11, 1947
Creator:
Pitkin, Marvin; Gardner, William N. & Curfman, Howard J., Jr.
Object Type:
Report
System:
The UNT Digital Library
Characterization of Vadose Zone Sediments Below the TX Tank Farm: Probe Holes C3830, C3831, C3832 and 299-W10-27
Pacific Northwest National Laboratory performed detailed analyses on vadose zone sediments from within Waste Management Area T-TX-TY. This report contains all the geologic, geochemical, and selected physical characterization data collected on vadose zone sediment recovered from three probe holes (C3830, C3831, and C3832) in the TX Tank Farm, and from borehole 299-W-10-27. Sediments from borehole 299-W-10-27 are considered to be uncontaminated sediments that can be compared with contaminated sediments. This report also presents our interpretation of the sediment lithologies, the vertical extent of contamination, the migration potential of the contaminants, and the likely source of the contamination in the vadose zone and groundwater below the TX Tank Farm. Sediment from the probe holes was analyzed for: moisture, radionuclide and carbon contents;, one-to-one water extracts (soil pH, electrical conductivity, cation, trace metal, and anion data), and 8 M nitric acid extracts. Overall, our analyses showed that common ion exchange is a key mechanism that influences the distribution of contaminants within that portion of the vadose zone affected by tank liquor. We did not observe significant indications of caustic alteration of the sediment mineralogy or porosity, or significant zones of slightly elevated pH values in the probe holes. The sediments do show …
Date:
April 1, 2004
Creator:
Serne, R JEFFREY.; Bjornstad, Bruce N.; Horton, Duane G.; Lanigan, David C.; Lindenmeier, Clark W.; Lindberg, Michael J. et al.
Object Type:
Report
System:
The UNT Digital Library
Dark Matter Constraints from a Cosmic Index of Refraction
The dark-matter candidates of particle physics invariably possess electromagnetic interactions, if only via quantum fluctuations. Taken en masse, dark matter can thus engender an index of refraction which deviates from its vacuum value. Its presence is signaled through frequency-dependent effects: the real part yields dispersive effects in propagation, and the imaginary part yields such in attenuation. We discuss theoretical constraints on the expansion of the index of refraction with frequency, the physical interpretation of the terms, and the particular observations needed to isolate its coefficients. This, with the advent of new opportunities to view gamma-ray bursts at cosmological distance scales, gives us a new probe of dark matter. As a first application we use the time delay determined from radio afterglow observations of gamma-ray bursts to limit the charge-to-mass ratio of dark matter to |{var_epsilon}|/M < 1.8 x 10{sup -5} eV{sup -1} at 95% CL.
Date:
April 1, 2009
Creator:
Gardner, Susan & Latimer, David C.
Object Type:
Article
System:
The UNT Digital Library
A Limited Correlation of Atmospheric Sounding Data and Turbulence Experienced by Rocket-Powered Models
Note presenting an analysis and comparison of atmospheric turbulence as experienced by rocket-powered models and temperature lapse-rate data obtained from rawinsonde soundings in 38 cases by using an assumed temperature lapse-rate stability boundary as a basis for comparison. A limited correlation has been obtained which indicates that atmospheric conditions classified as being unstable will generally be turbulent, but a marginal or stable classification does not necessarily indicate smooth air.
Date:
April 1957
Creator:
Mason, Homer P. & Gardner, William N.
Object Type:
Report
System:
The UNT Digital Library
Preparation and evaluation of novel hydrous metal oxide (HMO)-supported noble metal catalysts
Hydrous Metal Oxides (HMOs) are chemically synthesized materials that, because of their high cation exchange capacity, possess a unique ability to allow the preparation of highly dispersed supported-metal catalyst precursors with high metal loadings. This study evaluates high weight loading Rh/HMO catalysts with a wide range of HMO support compositions, including hydrous titanium oxide (HTO), silica-doped hydrous titanium oxide (HTO:Si), hydrous zirconium oxide (HZO), and silica-doped hydrous zirconium oxide (HZO:Si), against conventional oxide-supported Rh catalysts with similar weight loadings and support chemistries. Catalyst activity measurements for a structure-sensitive model reaction (n-butane hydrogenolysis) as a function of catalyst activation conditions show superior activity and stability for the ZrO{sub 2}, HZO, and HZO:Si supports, although all of the Rh/HMO catalysts have high ethane selectivity indicative of high Rh dispersion. For the TiO{sub 2}-, HTO-, and HTO:Si supported Rh catalysts, a significant loss of both catalyst activity and Rh dispersion is observed at more aggressive activation conditions, consistent with TiO{sub x} migration associated with SMSI phenomena. Of all the Rh/HMO catalysts, the Rh/HZO:Si catalysts appear to offer the best tradeoff in terms of high Rh dispersion, high activity, and high selectivity.
Date:
April 1, 1998
Creator:
Gardner, Timothy J.; McLaughlin, Linda I.; Evans, Lindsey R. & Datye, Abhaya K.
Object Type:
Report
System:
The UNT Digital Library
Examination of the pathways from soil to man for plutonium
The data available on resuspension and ingestion as pathways of plutonium from soil to man were reviewed and a recommended limit based upon a conservative interpretation of the National Council on Radiation Protection and Measurements (NCRP) recommendations for limiting values was derived. Wind resuspension appeared to be the least limiting value with mechanical resuspension and pica in children among the more important. Ingestion of foodstuffs could also be an important pathway if it is assumed that all food is produced in the contaminated area.
Date:
April 1, 1977
Creator:
Healy, J. W.
Object Type:
Report
System:
The UNT Digital Library