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11,805 Matching Results
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Grub-Plow.
Patent for a grub plow with a better cutter, which can be adjusted to different depths of soil.
Date:
August 15, 1911
Creator:
Gardner, Eli J. & Odem, David
Object Type:
Patent
System:
The Portal to Texas History
Geologic map of the Sulphur Springs Area, Valles Caldera Geothermal System, New Mexico
The geologic and tectonic setting and geology of Sulphur Springs Area are described. Geologic faults, sheared or brecciated rock, volcanic vents, geothermal wells, hydrothermal alteration, springs, thermal springs, fumaroles, and geologic deposits are indicated on the map. (MHR)
Date:
December 1, 1980
Creator:
Goff, F.E. & Gardner, J.N.
Object Type:
Report
System:
The UNT Digital Library
ACTL: evaluated neutron activation cross section library-evaluation techniques and reaction index. [Tables, 10/sup -10/ to 20 MeV]
A library of evaluated neutron-induced activation cross sections (ACTL) was compiled. The library covers incident neutron energies from 10/sup -10/ to 20 MeV. General descriptions of the evaluation methods and an index to the evaluated cross sections are presented. 21 references.
Date:
October 17, 1978
Creator:
Gardner, M.A. & Howerton, R.J.
Object Type:
Report
System:
The UNT Digital Library
Use of gamma ray strength functions for predicting the neutron capture cross section of /sup 88/Y
The present study indicates that the estimation of the gamma-ray strength function is the approach least subject to error when unmeasured capture cross sections are to be computed. An estimate is given for the /sup 88/..gamma..(n,..gamma..) cross section.
Date:
July 29, 1977
Creator:
Gardner, D. G. & Gardner, M. A.
Object Type:
Report
System:
The UNT Digital Library
Some tools of the trade we`ve developed for our cross-section calculations
A number of compute codes have been modified or developed, both main-frame and PC. Seven codes, of which three are discussed in some detail. The later are: a controller-driven, double-precision version of the coupled-channel code ECIS; the latest version of STAPRE, a precompound plus Hauser-Feshbach nuclear reaction code; and NUSTART, a PC code that analyzes large sets of discrete nuclear levels and the multipole transitions among them. All main-frame codes are now being converted to the UNICOS operating system.
Date:
November 1, 1992
Creator:
Gardner, D. G. & Gardner, M. A.
Object Type:
Article
System:
The UNT Digital Library
Difficulties with inferring neutron cross sections from charged-particle reactions
We have investigated problems associated with inferring cross sections for neutron reactions on unstable nuclei in the mass-90 region from charged-particle reactions on nearby stable targets. We conclude that effects due to precompound evaporation, isospin, and multiple reaction paths severely limit the circumstances under which charged-particle studies may be directly and easily converted to neutron cross sections of useful accuracy. 4 refs., 2 figs.
Date:
May 7, 1985
Creator:
Gardner, D. G. & Gardner, M. A.
Object Type:
Article
System:
The UNT Digital Library
Setup and Performance of the Rhic Injector Accelerators for the 2005 Run With Copper Ions.
Copper ions for the 2005 run [1] of the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) are accelerated in the Tandem, Booster and AGS prior to injection into RHIC. The setup and performance of these accelerators with copper are reviewed in this paper.
Date:
May 16, 2005
Creator:
Ahrens, L.; Alessi, J. & Gardner, C. J.
Object Type:
Article
System:
The UNT Digital Library
Continued study of the parameterization of the El gamma-ray strength function
The parameterization of the magnitude and the energy dependence of the E1 gamma-ray strength function for the calculation of neutron- and proton-induced capture cross sections and capture gamma-ray spectra is investigated. The energy-dependent Breit-Wigner (EDBW) is reparameterized incorporating a more general expression for the Breit-Wigner line shape. Evaluation of the reparameterized E1 gamma-ray strength function is discussed. (WHK)
Date:
June 19, 1981
Creator:
Gardner, M. A. & Gardner, D. G.
Object Type:
Article
System:
The UNT Digital Library
Calculated neutron capture cross sections for the ground states and isomers of /sup 93/ /sup 94/ and /sup 95/Nb. [Resolved resonance region to 4 MeV, strength functions, statistical model]
Neutron-induced capture cross sections for the ground states and first isomeric states of /sup 93/Nb, /sup 94/Nb and /sup 95/Nb were studied from the resolved resonance region to 4 MeV via statistical model calculations. The production of isomers was included. Inelastic scattering cross sections and gamma-ray production spectra were also calculated. The anti GAMMA/ sub ..gamma..//D ratios were derived from gamma-ray strength function systematics. Total capture cross sections on the ground states are found to be within a factor of two of each other. Capture cross sections on the isomeric targets are important as well, not only because of their magnitude but also because of the significant population of these isomeric levels by inelastic scattering. 10 references.
Date:
September 1, 1978
Creator:
Gardner, M. A. & Gardner, D. G.
Object Type:
Article
System:
The UNT Digital Library
Importance of level structure in nuclear reaction cross-section calculations. Revision 1
It is shown that level-density expressions cannot adequately represent or substitute for level structure information when making calculations of the Hauser-Feshbach type for cross sections or isomer-ratios for nuclei in the first few MeV above their ground state. It is stated that such discrete level information should include both experimentally confirmed and theoretically predicted levels. The utility of discrete level information to optimize level density calculations, to compute isomer ratios, in deriving dipole strength functions, and in the analysis of primary gamma ray spectra is emphasized, especially for nuclei far from the line of stability. 29 refs., 12 figs., 6 tabs. (DWL)
Date:
November 7, 1985
Creator:
Gardner, M. A. & Gardner, D. G.
Object Type:
Article
System:
The UNT Digital Library
Calculated cross sections for production and destruction of some long-lived nuclides of importance in fusion energy applications
Knowledge of the production and destruction of long-lived species via neutrons, photons, and charged-particles is required in many fusion energy applications, such as reactor first-wall and blanket design, radioactive waste management, etc. Here we describe our calculational results for the production, via the (n,2n) reaction, of the following long-lived species: {sup 150}Eu(t{sub 1/2} = 36 y), {sup 152}Eu(t{sub 1/2} = 13 y), and {sup 192m2}Ir(t{sub 1/2} = 241 y). Some comments on calculations that we`ve made for destruction reactions of these species are also included.
Date:
July 8, 1993
Creator:
Gardner, M. A. & Gardner, D. G.
Object Type:
Article
System:
The UNT Digital Library
Properties of thermally contracting tantalum tungstates. [Ta/sub 22/W/sub 4/O/sub 67/, Ta/sub 2/WO/sub 8/, Ta/sub 16/W/sub 18/O/sub 94/]
None
Date:
February 22, 1977
Creator:
Holcombe, Jr., C. E.; Smith, D. D.; Richards, H. L. & Lore, J. D.
Object Type:
Report
System:
The UNT Digital Library
Some limitations of detailed balance for inverse reaction calculations in the astrophysical p-process
p-Process modeling of some rare but stable proton-rich nuclei requires knowledge of a variety of neutron, charged particle, and photonuclear reaction rates at temperatures of 2 to 3 {times} 10{sup 9} {degrees}K. Detailed balance is usually invoked to obtain the stellar photonuclear rates, in spite of a number of well-known constraints. In this work we attempt to calculate directly the stellar rates for ({gamma},n) and ({gamma},{alpha}) reactions on {sup 151}Eu. These are compared with stellar rates obtained from detailed balance, using the same input parameters for the stellar (n,{gamma}) and ({alpha},{gamma}) reactions on {sup 150}Eu and {sup 147}Pm, respectively. The two methods yielded somewhat different results, which will be discussed along with some sensitivity studies. 16 refs., 7 figs.
Date:
December 5, 1990
Creator:
Gardner, D. G. & Gardner, M. A.
Object Type:
Article
System:
The UNT Digital Library
Preliminary evaluation of neutron capture cross sections for /sup 144/Sm, /sup 145/Sm and /sup 145/Pm
We have made preliminary neutron-capture cross-section calculations of the Hauser-Feshbach type for the isotopes /sup 144/Sm, /sup 145/Sm, and /sup 145/Pm to investigate the production of radioactive /sup 145/Pm by neutron capture on the stable isotope /sup 144/Sm. The calculations were made for incident neutron energies from 2.5 MeV to about 1/sup -4/ or 10/sup -5/ MeV, wherever the first unbound resonance was estimated to occur in each case. At that energy, the calculated value was reduced by a somewhat arbitrary factor, and the excitation function extended down to thermal energy using a (E/sub n/)/sup -1/2/ energy dependence. Since very large uncertainties are associated with the position and magnitude of the first unbound resonance and the subsequent extrapolation back to thermal energy, the cross sections in this low-energy region should not be considered more accurate than +- a factor of 10. For incident neutron energies above each step, the calculations represent an average through the separated and overlapping resonance regions and may be accurate to better than +- a factor of 2. 18 refs., 7 figs., 5 tabs.
Date:
February 13, 1986
Creator:
Gardner, D. G. & Gardner, M. A.
Object Type:
Report
System:
The UNT Digital Library
EVALUATION OF SIX ZIRCALOY-CLAD U-2 w/o Zr ALLOY TUBES MADE FOR IRRADIATION IN THE VBWR TEST LOOP
Enriched U-Zr power tubes with various component sleeves, seals, and plates were evaluated for testing in the General Electric Test Reactor. The evaluation data are tabulated. (J. R. D.)
Date:
June 10, 1959
Creator:
Kaufman, D.F. & Richmond, W.J.
Object Type:
Report
System:
The UNT Digital Library
Three-dimensional radiation transport hydrodynamics
None
Date:
July 1, 1994
Creator:
Fyfc, D. E.; Dahlburg, J. P.; Gardner, J. H. & Haan, S. W.
Object Type:
Report
System:
The UNT Digital Library
Capture cross section and gamma-ray spectrum calculations for medium-weight nuclei. [Double-peak, energy-dependent Breit-Wigner model]
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 cross-section data, and the calculation of the observed hardness in the capture gamma-ray spectra. For nuclei at or near the closed, N = 50 shell, however, the double-peak assumption breaks down. In these cases, good results are still obtained if the same set of model parameters is applied, except that the E1 strength function is formulated in terms of the first, narrower peak. 8 figures.
Date:
November 14, 1979
Creator:
Gardner, M. A. & Gardner, D. G.
Object Type:
Article
System:
The UNT Digital Library
ORNL 150 keV neutral beam test facility
The 150 keV neutral beam test facility provides for the testing and development of neutral beam injectors and beam systems of the class that will be needed for the Tokamak Fusion Test Reactor (TFTR) and The Next Step (TNS). The test facility can simulate a complete beam line injection system and can provide a wide range of experimental operating conditions. Herein is offered a general description of the facility's capabilities and a discussion of present system performance.
Date:
January 1, 1977
Creator:
Gardner, W.L.; Kim, J.; Menon, M.M. & Schilling, G.
Object Type:
Article
System:
The UNT Digital Library
Search for W-prime boson production in the top quark decay channel
We present a search for the production of a new heavy gauge boson W' that decays to a top quark and a bottom quark. We have analyzed 230 pb{sup -1} of data collected with the D0 detector at the Fermilab Tevatron collider at a center-of-mass energy of 1.96 TeV. No significant excess of events is found in any region of the final state invariant mass distribution. We set upper limits on the production cross section of W bosons at the 95% confidence level for several different W' boson masses. We exclude masses below 610 GeV for a W' boson with standard-model-like couplings, below 630 GeV for a W' boson with right-handed couplings that is allowed to decay to both leptons and quarks, and below 670 GeV for a W' boson with right-handed couplings that is only allowed to decay to quarks.
Date:
July 1, 2006
Creator:
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T. et al.
Object Type:
Article
System:
The UNT Digital Library
Report for Evaluation of Canonical SNP Taqman Assays to Detect Biothreat Agents and Environmental Samples for DHS
None
Date:
May 3, 2011
Creator:
Jaing, C; Hinkley, A; Gardner, S & Thissen, J
Object Type:
Report
System:
The UNT Digital Library
Surface hydrology, sediment transport dynamics, and remote sensing of disturbed watersheds in a humid temperature region
The specific objectives of this research are to quantify relationships between surface spectral properties and infiltration capacity explore the interaction between surface hydrology and basin morphology, specifically drainage network morphology, and develop a comprehensive process-response model for drainage basin evolution. This research examines the response of the drainage network and drainage basin water discharge to changes in the dominant processes that control infiltration and runoff, namely macropore network development. Infiltration, the primary regulator of runoff, is analyzed with respect to surface spectral characteristics and drainage basin water discharge. Changes in basin discharge measured on a storm event basis in the field are supplemented with simulated discharge events using a distributed hydrologic model. The hydrologic model is evaluated and parameterized by means of a detailed sensitivity analysis. The response of drainage basin water discharge to charges in infiltration properties of minesoils, and the inferred runoff process, and drainage network morphology is examined. The threshold discharge, or stream power, for sediment entrainment and the implications for changes in sediment discharge through time is also discussed. Ritter and Gardner conclude with a process-response model for drainage basin evolution, with implications for natural drainage basin response to climate change. Finally, basic rainfall-runoff relationships developed …
Date:
October 1, 1991
Creator:
Gardner, T.W. & Miller, A.C.
Object Type:
Report
System:
The UNT Digital Library
Pulsed laser stereo photography of electrically exploded bridges
A technique is described for obtaining short exposure (approximately 8 ns) high resolution photomicrographs of electrically exploded bridges using a pulsed laser for bridge illumination and band-pass filters to eliminate the intense self light. Two cameras are described, one for a small field of view (approximately 1 mm) and one for a relatively large field of view (approximately 20 mm). A carbon disulfide cell and a fiber-optic light guide are used to essentially eliminate speckle, which normally limits the resolution of laser photographs of diffuse surfaces. A series of photomicrographs showing the detailed burst characteristics of both flat and round bridges are shown.
Date:
January 1, 1976
Creator:
Seitz, W. L. & Gardner, S. D.
Object Type:
Article
System:
The UNT Digital Library
Initial Assessment of Time of Travel and Mixing through Gulf Island Pond and the Lower Androscoggin River, Maine
From purpose and scope: The purpose of this interim report is to describe the unconventional methods required to analyze time-of-travel data in this reservoir and the regulated section of the Lower Androscoggin River.
Date:
1983
Creator:
Parker, Gene W. & Hunt, Gardner S.
Object Type:
Report
System:
The UNT Digital Library
Optical assessment of large marine particles: development of an imaging and analysis sytem for quantifying large particle distributions and fluxes. Annual report, 1992-1993
The central goal of DOE`s Ocean Margin Program (OMP) is 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 (Program Announcement, 1991). A major component of the OMP will be to measure carbon flux on the shelf and across the shelf to the slope and open ocean. We are developing a video and optical instrument package (LAPS: Large Aggregate Profiling System) and the analytical techniques to precisely 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 (diameters > 0.5 mm), is thought to be the major pathway of material flux in the ocean (McCave, 1975; Asper, 1987; Walsh and Gardner, 1992). Our goal is to use aggregate abundance and size spectrum data along with the CTD, beam attenuation and fluorescence data collected with our instrument package to collect data rapidly, repeatedly and accurately such that it is both linkable to carbon flux and usable in biophysical models. Additionally, measurements of particle flux will be made with sediment traps deployed on the continental slope in conjunction …
Date:
May 1, 1994
Creator:
Walsh, I. D. & Gardner, W. D.
Object Type:
Report
System:
The UNT Digital Library