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Chemical thermodynamic representations of <PuO/sub 2-x> and <U/sub 1-z/Pu/sub z/O/sub w/>
All available oxygen potential-temperature-composition data for the calcium fluorite-structure <PuO/sub 2-x/> phase were retrieved from the literature and utilized in the development of a binary solid solution representation of the phase. The data and phase relations are found to be best described by a solution of (Pu/sub 4/3/O/sub 2/) and (PuO/sub 2/) with a temperature dependent interaction energy. The fluorite-structure <U/sub 1-z/Pu/sub z/O/sub w/> is assumed to be represented by a combination of the binaries <PuO/sub 2-x/> and <UO/sub 2+-x/>, and thus treated as a solution of (Pu/sub 4/3/O/sub 2/), (PuO/sub 2/), (UO/sub 2/), and either (U/sub 2/O/sub 4/./sub 5/) or (U/sub 3/O/sub 7/). The resulting equations well reproduce the large amount of oxygen potential-temperature-composition data for the mixed oxide system, all of which were also retrieved from the literature. These models are the first that appear to display the appropriate oxygen potential-temperature-composition and phase relation behavior over the entire range of existence for the phases. 39 refs., 10 figs., 3 tabs.
Date:
January 1, 1984
Creator:
Besmann, Theodore M. & Lindemer, Terrence B.
System:
The UNT Digital Library
Measurement of the production cross section for W-bosons in association with jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
None
Date:
June 11, 2013
Creator:
Aad, Georges
System:
The UNT Digital Library
Production of Mesons by the 184-inch Berkeley Cyclotron
The authors have observed tracks which they believe to be due to mesons in photographic plates placed near a target bombarded by 380 Mev alpha particles. For a 10-minute exposure in the cyclotron, about 50 meson tracks are found along the 3-inch edge of a photographic plate. The mass has been determined by measuring the bending in the magnetic field and the range in emulsion. From the first 50 meson tracks measured they find a mass of 313 {+-} 16 electron masses. It is highly probable that these mesons are the heavy mesons described by Lattes, Occhialini, and Powell.
Date:
January 1, 1948
Creator:
Gardner, Eugene & Lattes, C. M. G.
System:
The UNT Digital Library
Reservoir fracture mapping using microearthquakes: Austin chalk, Giddings field, TX and 76 field, Clinton Co., KY
Patterns of microearthquakes detected downhole defined fracture orientation and extent in the Austin chalk, Giddings field, TX and the 76 field, Clinton Co., KY. We collected over 480 and 770 microearthquakes during hydraulic stimulation at two sites in the Austin chalk, and over 3200 during primary production in Clinton Co. Data were of high enough quality that 20%, 31% and 53% of the events could be located, respectively. Reflected waves constrained microearthquakes to the stimulated depths at the base of the Austin chalk. In plan view, microearthquakes defined elongate fracture zones extending from the stimulation wells parallel to the regional fracture trend. However, widths of the stimulated zones differed by a factor of five between the two Austin chalk sites, indicating a large difference in the population of ancillary fractures. Post-stimulation production was much higher from the wider zone. At Clinton Co., microearthquakes defined low-angle, reverse-fault fracture zones above and below a producing zone. Associations with depleted production intervals indicated the mapped fractures had been previously drained. Drilling showed that the fractures currently contain brine. The seismic behavior was consistent with poroelastic models that predicted slight increases in compressive stress above and below the drained volume.
Date:
November 1, 1996
Creator:
Phillips, W. S.; Rutledge, J. T.; Gardner, T. L.; Fairbanks, T. D.; Miller, M. E. & Schuessler, B. K.
System:
The UNT Digital Library
Turn-by-Turn Analysis of Proton and Gold Beams at Injection in the AGS Booster.
In this paper we describe the latest version of a program we have used for several years to acquire and analyze turn-by-turn data from pick-up electrodes in the AGS Booster during injection. The program determines several parameters of the injected beam including the tunes and the position and angle of the incoming beam. Examples are given for both proton and gold injection.
Date:
March 29, 1999
Creator:
Gardner, C.; Ahrens, L. & Williams, N.
System:
The UNT Digital Library
A standardized approach for determining radiological sabotage targets
The US Department of Energy has required radiological sabotage vulnerability assessments to be conducted for years. However, the exact methodology to be used in this type of analysis still remains somewhat elusive. Therefore, there is tremendous variation in the methodologies and assumptions used to determine release levels and doses potentially affecting the health and safety of the public. In some cases, there are three orders of magnitude difference in results for dispersal of similar materials under similar meteorological conditions. To address this issue, the authors have developed an approach to standardizing radiological sabotage target analysis that starts by addressing basic assumptions and then directs the user to some recommended computerized analytical tools. Results from different dispersal codes are also compared in this analysis.
Date:
July 1, 1993
Creator:
Gardner, B. H. & Snell, M. K.
System:
The UNT Digital Library
The Instructor-Free Training Department
Today`s skills will be obsolete in the year 2000. That workforce will require a much higher degree of technical sophistication and adaptability. Enormous demands will be made of DOE contractor training departments even as federal deficit reduction actions increasingly restrict resources and as the emergence of electronic performance support systems appear to diminish the need for training. True training will still be required but they must, and can, train better, faster, and cheaper. These goals are attainable by implementing the implications of performance-based training and by focusing on learning instead of on teaching. (Indeed, ability to learn efficiently and rapidly will be the premier talent in the next century.) Training Departments must dedicate themselves to changing performance, not to teaching classes. The best training department of the future will have no {open_quotes}instructors{close_quotes}. Trainingforce 2000 will look and function much differently.
Date:
November 1, 1993
Creator:
Gardner, P. R. & Sanford, D. E.
System:
The UNT Digital Library
K-shell x-ray production cross sections of selected elements from Ti to Y for 0.5- to 2.5-MeV alpha-particle bombardment
This article discusses K-shell x-ray production cross sections of Ti, V, Cr, Fe, Ni, Cu, Zn, Ga, As, Se, Rb, Sr, and Y for 0.5- to 2.5-MeV alpha particles.
Date:
May 1975
Creator:
McDaniel, Floyd Del. (Floyd Delbert), 1942-; Gray, Tom J. & Gardner, R. K.
System:
The UNT Digital Library
Synthesis, Characterization, and Catalytic Activity of Sulfided Silico-Alumino-Titanate (Si-Al-Ti) Mixed Oxides Xerogels Supported Ni-Mo Catalyst
Layered semicrystalline silico-alumino-titanate (Si-Al-Ti) mixed oxides were synthesized by a modified sol-gel method with hydrothermal synthesis temperatures less than 200 C and autogenic pressure. The solid products are semicrystalline materials with a surface area of 136-367 m{sup 2}/g and a monomodal pore size distribution with an average pore diameter of 3.6-4.7 nrn. The catalytic activity for pyrene hydrogenation in a batch reactor at 300 C and 500 psig was determined for sulfided Ni-Mo supported on the Si-Al-Ti mixed oxide. The activity was a function of the support composition the heat treatment before and after loading the active metals, the addition of organic templates, and different methods of metal loading. The most active sulfided Ni-Mo/Si-Al-Ti catalyst has an activity in the same range as the commercial catalyst, Shell 324, but the metal loading is 37% less than the commercial catalyst.
Date:
February 24, 1999
Creator:
Al-Adwani, H. A.; Anthony, R. G.; Gardner, T. J. & Thammachote, N.
System:
The UNT Digital Library
National RF Test Facility as a multipurpose development tool
Additions and modifications to the National RF Test Facility design have been made that (1) focus its use for technology development for future large systems in the ion cyclotron range of frequencies (ICRF), (2) expand its applicability to technology development in the electron cyclotron range of frequencies (ECRF) at 60 GHz, (3) provide a facility for ELMO Bumpy Torus (EBT) 60-GHz ring physics studies, and (4) permit engineering studies of steady-state plasma systems, including superconducting magnet performance, vacuum vessel heat flux removal, and microwave protection. The facility will continue to function as a test bed for generic technology developments for ICRF and the lower hybrid range of frequencies (LHRF). The upgraded facility is also suitable for mirror halo physics experiments.
Date:
January 1, 1983
Creator:
McManamy, T. J.; Becraft, W. R.; Berry, L. A.; Blue, C. W.; Gardner, W. L.; Haselton, H. H. et al.
System:
The UNT Digital Library
Measurement of the p - anti-p ---> W gamma + X cross section at s**(1/2) = 1.96-TeV and WW gamma anomalous coupling limits
The WW{gamma} triple gauge boson coupling parameters are studied using p{bar p} {yields} {ell}{nu}{gamma} + X({ell} = e, {mu}) events at {radical}s = 1.96 TeV. The data were collected with the D0 detector from an integrated luminosity of 162 pb{sup -1} delivered by the Fermilab Tevatron Collider. The cross section times branching fraction for p{bar p} {yields} W({gamma}) + X {yields} {ell}{nu}{gamma} + X with E{sub T}{sup {gamma}} > 8 GeV and {Delta}R{sub {ell}{gamma}} > 0.7 is 14.8 {+-} 1.6(stat) {+-} 1.0(syst) {+-} 1.0(lum) pb. The one-dimensional 95% confidence level limits on anomalous couplings are -0.88 < {Delta}{kappa}{sub {gamma}} < 0.96 and -0.20 < {lambda}{sub {gamma}} < 0.20.
Date:
March 1, 2005
Creator:
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T. et al.
System:
The UNT Digital Library
Overcoming Depolarizing Resonances in the AGS With Two Helical Partial Snakes
Dual partial snake scheme has provided polarized proton beams with 1.5 x 10{sup 11} intensity and 65% polarization for the Relativistic Heavy Ion Collider (RHIC) spin program. To overcome the residual polarization loss due to horizontal resonances in the Brookhaven Alternating Gradient Synchrotron (AGS), a new string of quadrupoles have been added. The horizontal tune can then be set in the spin tune gap generated by the two partial snakes, such that horizontal resonances can also be avoided. This paper presents the accelerator setup and preliminary results.
Date:
June 25, 2007
Creator:
Huang, H.; Ahrens, L.; Bai, M.; Brown, K. A.; Gardner, C. J.; Glenn, J. W. et al.
System:
The UNT Digital Library
[Clipping: 'Our Daring Young Women': WWII role models guide women pilots]
Photocopy of an clipping on the legacy of Women Airforce Service Pilots, their contributions to World War II, and their eventual fight to gain veteran status.
Date:
November 1984
Creator:
Watson, Liz
System:
The Portal to Texas History
United States-Russia exchange visits
The Department of Energy, under a government-to-government program, hosted the first visit with the Russian Federation to exchange information and technologies for special nuclear material control, accounting, and physical protection at a plutonium storage facility. The Russian specialists toured a storage facility at the Hanford Site near Richland, Washington, and were shown the physical protection and materials control systems that DOE employs to protect excess nuclear materials. Technical discussions included topics associated with protective forces and their operation, perimeter and interior intrusion detection and assessment equipment/systems, vulnerability assessment demonstrations, and the vault monitoring and materials control systems. In October, the Russian Federation hosted a reciprocal visit to the Mayak Enterprise civil plutonium storage facility, previously known as Chelyabinsk-65. The US specialists participated in technical discussions on the protection and control of plutonium and supported an evaluation of safeguards and security at the Mayak storage facility.
Date:
September 1, 1995
Creator:
Desmond, W. J.; Czajkowski, A. F.; Zack, N. R.; Martin, H. R.; Gardner, B.; Schlegel, S. et al.
System:
The UNT Digital Library
Conversion-electron experiment to characterize the decay of the /sup 237/Np shape isomer
Conversion electrons from the decay of low-lying levels of /sup 237/Np have been measured to detect the population of these levels by gamma-ray decay of the /sup 237/Np shape isomer. Analysis of the 208-keV transition L conversion-electron peak gives an upper limit of about 17 ..mu..b for the population of the 3/2/sup -/ 267-keV level in /sup 237/Np from the shape isomer decay. Model calculations are compared with the measured limit. Improvements are suggested for this experiment. 9 refs., 4 figs.
Date:
December 8, 1987
Creator:
Henry, E. A.; Becker, J. A.; Bauer, R. W.; Gardner, D. G.; Decman, D. J.; Meyer, R. A. et al.
System:
The UNT Digital Library
Setup and performance of RHIC for the 2008 run with deuteron-gold collisions.
This year (2008) deuterons and gold ions were collided in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) for the first time since 2003. The setup and performance of the collider for the 2008 run is reviewed with a focus on improvements that have led to an order of magnitude increase in luminosity over that achieved in the 2003 run.
Date:
June 23, 2008
Creator:
Gardner,C.; Abreu, N.P.; Ahren, L.; Alessi, J.; Bai, M. & al., et
System:
The UNT Digital Library
Measurement of the Inclusive $W^\pm$ and Z/Gamma Cross Sections in the Electron and Muon Decay Channels in $Pp$ Collisions at $\sqrt{s}=7$ TeV with the ATLAS Detector
None
Date:
May 29, 2013
Creator:
Aad, Georges
System:
The UNT Digital Library
Normalized emittance of SITEX negative ion source
An emittance measurement employing two techniques are being made on SITEX. To this end, a 2-D calculation was performed to design the accelerator in order to reduce electric field abberations. The calculated normalized emittance is 6 x 10/sup -4/ IIcm mrad for an angular divergence theta/sub RMS/ approx. = 0.28/sup 0/. Status of the experimental findings are presented and a comparison made to the calculated value which will yield the ion sputter energy.
Date:
January 1, 1983
Creator:
Stirling, W. L.; Dagenhart, W. K.; Whealton, J. H. & Donaghy, J. J.
System:
The UNT Digital Library
Nuclear engineering laboratory self regulated power oscillation experiments at the Health Physics Research Reactor
Self regulated power oscillation experiments with a variety of initial conditions have been performed with the ORNL Health Physics Research Reactor (HPRR) by undergraduate nuclear engineering students from The University of Tennessee for several years. These experiments demonstrate the coupling between reactor kinetics and heat transfer and show how the temperature coefficient of reactivity affects reactor behavior. A model that consists of several coupled first order nonlinear differential equations is used to calculate the temperature of the core center and surface and power as a function of time which are compared with the experimental data; also, the model is also used to study the effects of various model parameters and initial conditions on the amplitude, frequency and damping of the power and temperature oscillations. A previous paper presented some limited experimental results and demonstrated the correspondence between a simple point model and the experimental data. This paper presents the results of experiments for: (1) the initial power fixed at 9 kW with central core temperatures of 300/sup 0/F and 500/sup 0/F, annd (2) the initial central core temperature fixed at 500/sup 0/F with initial powers of 6 and 8 kW.
Date:
January 1, 1983
Creator:
Miller, L. F.; Mihalczo, J. T.; Bailiff, E. G.; Woody, N. D. & Gardner, G. D.
System:
The UNT Digital Library
MIMD massively parallel methods for engineering and science problems
MIMD massively parallel computers promise unique power and flexibility for engineering and scientific simulations. In this paper we review the development of a number of software methods and algorithms for scientific and engineering problems which are helping to realize that promise. We discuss new domain decomposition, load balancing, data layout and communications methods applicable to simulations in a broad range of technical field including signal processing, multi-dimensional structural and fluid mechanics, materials science, and chemical and biological systems.
Date:
August 1, 1993
Creator:
Camp, W. J. & Plimpton, S. J.
System:
The UNT Digital Library
High intensity proton operation at the Brookhaven AGS accelerator complex
With the completion of the AGS rf upgrade, and the implementation of a transition {open_quotes}jump{close_quotes}, all of accelerator systems were in place in 1994 to allow acceleration of the proton intensity available from the AGS Booster injector to AGS extraction energy and delivery to the high energy users. Beam commissioning results with these new systems are presented. Progress in identifying and overcoming other obstacles to higher intensity are given. These include a careful exploration of the stopband strengths present on the AGS injection magnetic porch, and implementation of the AGS single bunch transverse dampers throughout the acceleration cycle.
Date:
August 1, 1994
Creator:
Ahrens, L. A.; Blaskiewicz, M.; Bleser, E.; Brennan, J. M.; Gardner, C.; Glenn, J. W. et al.
System:
The UNT Digital Library
Image Tool
ImageTool is a software package developed at Bechtel Nevada, Los Alamos Operations. This team has developed a set of analysis tools, in the form of image processing software used to evaluate camera calibration data. Performance measures are used to identify capabilities and limitations of a camera system, while establishing a means for comparing systems. The camera evaluations are designed to provide system performance, camera comparison and system modeling information. This program is used to evaluate digital camera images. ImageTool provides basic image restoration and analysis features along with a special set of camera evaluation tools which are used to standardize camera system characterizations. This process is started with the acquisition of a well-defined set of calibration images. Image processing algorithms provide a consistent means of evaluating the camera calibration data. Performance measures in the areas of sensitivity, noise, and resolution are used as a basis for comparing camera systems and evaluating experimental system performance. Camera systems begin with a charge-coupled device (CCD) camera and optical relay system and may incorporate image intensifiers, electro-static image tubes, or electron bombarded charge-coupled devices (EBCCDs). Electro-optical components provide fast shuttering and/or optical gain to camera systems. Camera types evaluated include gated intensified cameras and …
Date:
January 2001
Creator:
Baker, S. A.; Gardner, S. D.; Rogers, M. L.; Sanders, F. & Tunnell, T. W.
System:
The UNT Digital Library
Nonoxide ceramic interactions with uranium or carbon. [Reaction of BN, TiN, HfC, CeS, or Ce2S3 with U, C, BeO, W, or Y2O3]
The interaction of possible nonoxide containment materials (including boron nitride, titanium nitride, hafnium carbide, and two cerium sulfides) with uranium or carbon has been examined by thermal analysis techniques. Additionally, nonoxide-ceramic interaction with beryllia, tungsten, or yttria was investigated. Hafnium carbide is the least reactive nonoxide ceramic tested.
Date:
October 16, 1978
Creator:
Holcombe, C.E.
System:
The UNT Digital Library
Development and testing of the ORNL/PLT neutral beam lines for the Princeton Large Torus
Four neutral beam lines have been designed, constructed, and tested by the Oak Ridge National Laboratory (ORNL) in cooperation with the Princeton Plasma Physics Laboratory (PPPL) for application on the Princeton Large Torus (PLT) at PPPL. Two neutral beam lines are counterinjectors and two are coinjectors for a total neutral beam power of greater than 3 MW at 40 keV and up to 300 msec. Each beam line utilizes a 40-kV times 60-A modified duoPIGatron ion source with a close-coupled, 1.0-m long gas cell. Species ratios produced by the ion source are 84:13:3:E: E/2:E/3 for H/sup 0/ components delivered to the torus. The arc efficiency is less than 1 kW of arc power per ampere of beam current. Gas efficiency is approximately 50 percent with a total gas throughput of approximately 20 T-l/sec including supplemental gas to the gas cell. Two LHe cryocondensation pumps are used, one in the ion source tank with a speed of approximately 400,000 l/sec and the other in the drift tube with a speed of approximately 20,000 l/sec. The first beam line has been operated on PLT and has delivered 500 kW to the tokamak calorimeter for 150 msec. Initial heating results at 400 kW …
Date:
January 1, 1977
Creator:
Dagenhart, W. K.; Gardner, W. L.; Haselton, H. H.; Menon, M. M.; Schechter, D. E.; Stirling, W. L. et al.
System:
The UNT Digital Library