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464 Matching Results
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Theory of high-{Tc} superconducting cuprates based on experimental evidence
A model of superconductivity in layered high-temperature superconducting cuprates is proposed, based on the extended saddle point singularities in the electron spectrum, weak screening of the Coulomb interaction and phonon-mediated interaction between electrons plus a small short-range repulsion of Hund's, or spin-fluctuation, origin. This permits to explain the large values of {Tc}, features of the isotope effect on oxygen and copper, the existence of two types of the order parameter, the peak in the inelastic neutron scattering, the positive curvature of the upper critical field, as function of temperature etc.
Date:
December 10, 1999
Creator:
Abrikosov, A. A.
Object Type:
Article
System:
The UNT Digital Library
Hybrid and conventional hydrogen engine vehicles that meet EZEV emissions
In this paper, a time-dependent engine model is used for predicting hydrogen engine efficiency and emissions. The model uses basic thermodynamic equations for the compression and expansion processes, along with an empirical correlation for heat transfer, to predict engine indicated efficiency. A friction correlation and a supercharger/turbocharger model are then used to calculate brake thermal efficiency. The model is validated with many experimental points obtained in a recent evaluation of a hydrogen research engine. A The validated engine model is then used to calculate fuel economy and emissions for three hydrogen-fueled vehicles: a conventional, a parallel hybrid, and a series hybrid. All vehicles use liquid hydrogen as a fuel. The hybrid vehicles use a flywheel for energy storage. Comparable ultra capacitor or battery energy storage performance would give similar results. This paper analyzes the engine and flywheel sizing requirements for obtaining a desired level of performance. The results indicate that hydrogen lean-burn spark-ignited engines can provide a high fuel economy and Equivalent Zero Emission Vehicle (EZEV) levels in the three vehicle configurations being analyzed.
Date:
December 10, 1996
Creator:
Aceves, S. M. & Smith, J. R.
Object Type:
Article
System:
The UNT Digital Library
Molten salt oxidation for treating low-level mixed wastes
MS0 is a promising alternative to incineration for the treatment of a variety of organic wastes. Lawrence Livermore National Laboratory (LLNL) has prepared a facility (please see the photo attached) in which an integrated pilot-scale MS0 treatment system is being tested and demonstrated. The system consists of a MS0 vessel with a dedicated off-gas treatment system, a salt recycle system, feed preparation equipment, and a ceramic final waste forms immobilization system. The MSO/off-gas system has been operational since December 1997. The salt recycle system and the ceramic final forms immobilization became operational in May and August 1998, respectively. We have tested the MS0 facility with various organic feeds, including chlorinated solvents; tributyl phosphate/kerosene, PCB-contaminated waste oils & solvents, booties, plastic pellets, ion exchange resins, activated carbon, radioactive-spiked organics, and well-characterized low- level liquid mixed wastes. MS0 is a versatile technology for hazardous waste treatment and may be a solution to many waste disposal problems. In this paper we will present our operational experience with MS0 and also discuss its process capabilities as well as performance data with different feeds.
Date:
December 10, 1998
Creator:
Adamson, M G; Ford, T D; Foster, K G; Hipple, D L; Hopper, R W & Hsu, P C
Object Type:
Article
System:
The UNT Digital Library
The Boerne Star (Boerne, Tex.), Vol. 92, No. 90, Ed. 1 Tuesday, December 10, 1996
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
December 10, 1996
Creator:
Aldridge, Leon & D'Amico, Rob
Object Type:
Newspaper
System:
The Portal to Texas History
Development and evaluation of high resolution quadrupole mass analyzer and an inductively coupled plasma-Mach disk
By definition a plasma is an electrically conducting gaseous mixture containing a significant concentration of cations and electrons. The Inductively Coupled Plasma (ICP) is an electrodeless discharge in a gas at atmospheric pressure. This discharge is an excellent one for vaporizing, atomizing, and ionizing elements. The early development of the ICP began in 1942 by Babat and then by Reed in the early 1960s. This was then followed by the pioneering work of Fassel and coworkers in the late 1960s. Commercial ICP spectrometers were introduced in the mid 1970s. A major breakthrough in the area of ICP took place in the early 1980s when the ICP was shown to be an excellent ion source for mass spectrometry.
Date:
December 10, 1999
Creator:
Amad, Ma'an Hazem
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
[Photograph 2012.201.B0361B.0039]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Assistant Attorney General Neal Leader shows off part of his political memorabilia collection - including delegate ribbons from the 1905 statehood convention in Guthrie and from the Oklahoma delegation to the 1908 Democratic National Convention in Denver."
Date:
December 10, 1992
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
PERFORMANCE CONFIRMATION FOR AN MGDS AT YUCCA MOUNTAIN
None
Date:
December 10, 1997
Creator:
BRENT THOMSON, CARL VECCHIONE
Object Type:
Report
System:
The UNT Digital Library
B-physics at CDF
During the 1988/1989 run at the Fermilab Tevatron, the CDF detector collected {approx equal}4.1 pb{sup {minus}1} of p{bar p} data at {radical}s = 1.8 TeV. The main goals of this run being physics at high p{sub t}, the CDF trigger was tuned'' for maximizing signals from Z{sup 0}s, Ws, t-quarks, etc. As such, compared to the high p{sub t} physics, the b-physics program was of secondary importance other than that which would be used for background calculations. Also, CDF had no vertex chamber capability for seeing displaced vertices. However, significant b-quark, physics results are evident in two data samples; inclusive electrons and inclusive J/{psi} where J/{psi} {yields} {mu}{sup +}{mu}{sup {minus}}. We can then ask ourselves, given all this, why is it that CDF is able to do b-quark physics The answer is that nature has been kind enough to provide b-quarks at an extremely high rate at the Tevatron. The production cross-section for b{bar b} production is quite large. In the rest of this paper, I will try to specify the goals for b-physics using the inclusive electrons and J/{psi} signals for the 1988/1989 data set. I will then provide a brief look at the data, and will finish with …
Date:
December 10, 1990
Creator:
Baden, A.R. (Harvard Univ., Cambridge, MA (USA))
Object Type:
Article
System:
The UNT Digital Library
U.S. Environmental Protection Agency Clean Air Act notice of construction for spent nuclear fuel project - hot conditioning system annex, project W-484
This notice of construction (NOC) provides information regarding the source and the estimated quantity of potential airborne radionuclide emissions resulting from the operation of the Hot Conditioning System (HCS) Annex. The construction of the HCS Annex is scheduled to conunence on or about December 1996, and will be completed when the process equipment begins operations. This document serves as a NOC pursuant to the requirements of 40 Code of Federal Regulations (CFR) 61 for the HCS Annex. About 80 percent of the U.S. Department of Energy`s spent nuclear fuel (SNF) inventory is stored under water in the Hanford Site K Basins. Spent nuclear fuel in the K West Basin is contained in closed canisters, while the SNF in the K East Basin is contained in open canisters, which allows release of corrosion products to the K East Basin water. Storage of the current inventory in the K Basins was originally intended to be on an as-needed basis to sustain operation of the N Reactor while the Plutonium-Uranium Extraction (PUREX) Plant was refurbished and restarted. The decision in December 1992 to deactivate the PUREX Plant left approximately 2, 1 00 MT (2,300 tons) of uranium, as part of 1133 N Reactor …
Date:
December 10, 1996
Creator:
Baker, S. K.
Object Type:
Report
System:
The UNT Digital Library
News Bulletin (Castroville, Tex.), Vol. 39, No. 50, Ed. 1 Thursday, December 10, 1998
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
December 10, 1998
Creator:
Barnes, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
The Department of Energy’s Spallation Neutron Source Project: Description and Issues
This report describes the SNS's management, project costs, schedule, site selection, and funding, and discusses issues raised by some congressional critics of the project, such as management problems, potential cost overruns, and schedule delays.
Date:
December 10, 1999
Creator:
Barth, Kai-Henrik
Object Type:
Report
System:
The UNT Digital Library
Radiation monitor reporting requirements
Within High-Level Waste Management (HLWM), CAMs and VAMPs are currently considered Class B equipment, therefore, alarm conditions associated with the CAMs and VAMPs result in an Unusual Occurrence or Off-Normal notification and subsequent occurrence reporting. Recent equipment difficulties associated with Continuous Air Monitors (CAMs) and Victoreen Area Radiation Monitors (VAMPs) have resulted in a significant number of notification reports. These notification have the potential to decrease operator sensitivity to the significance of specific CAM and VAMP failures. Additionally, the reports are extremely costly and are not appropriate as a means for tracking and trending equipment performance. This report provides a technical basis for a change in Waste Management occurrence reporting categorization for specific CAM and VAMP failure modes.
Date:
December 10, 1993
Creator:
Bates, W. F.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0091.0472]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Birds in public view at the Oklahoma City Zoo include the Red-faced Liocichia."
Date:
December 10, 1993
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0091.0685]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Birds in public view at the Oklahoma City zoo include the Red-faced Liochichia, the Trumpeter Swan, and the African Pygmy Goose."
Date:
December 10, 1993
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0386.0122]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "OKC Mayor's Ron Norick and Santa Claus wave to children and parents attending the Mayor's Christmas party at the Myriad Saturday morning."
Date:
December 10, 1994
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0386.0123]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "STEVEN LOVE, 21 months old, sitting on his mother's lap (PAM) , is startled to find one of Santa's reindeers, Rudolph, sitting next to him at the Mayor's Christmas as Party at the Myriad Saturday morning ."
Date:
December 10, 1994
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1008.0575]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
December 10, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1030.0841]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
December 10, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1357.0631]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
December 10, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1357.0632]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
December 10, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Characterization of electrical resistivity as a function of temperature in the Mo-Si-B system
Measurements of electrical resistivity as a function of temperature from 25 to 1,500 C were conducted on polycrystalline samples in the Mo-Si-B system. Single phase, or nearly single phase, samples were prepared for the following phases: Mo{sub 3}Si, Mo{sub 5}SiB{sub 2}, Mo{sub 5}Si{sub 3}B{sub x}, MoB, MoSi{sub 2}, and Mo{sub 5}Si{sub 3}. Thesis materials all exhibit resistivity values within a narrow range(4--22 x 10{sup {minus}7}{Omega}-m), and the low magnitude suggests these materials are semi-metals or low density of states metals. With the exception of MoSi{sub 2}, all single phase materials in this study were also found to have low temperature coefficient of resistivity(TCR) values. These values ranged from 2.10 x 10{sup {minus}10} to 4.74 x 10{sup {minus}10}{Omega}-m/{degree} C, and MoSi{sub 2} had a TCR of 13.77 x 10{sup {minus}10}{Omega}-m/{degree} C. The results from the single phase sample measurements were employed in a natural log rule-of-mixtures model to relate the individual phase resistivity values to those of multiphase composites. Three Mo-Si-B phase regions were analyzed: the binary Mo{sub 5}Si{sub 3}-MoSi{sub 2} system, the ternary phase field Mo{sub 5}Si{sub 3}B{sub x}MoB-MoSi{sub 2}, and the Mo{sub 3}Si-Mo{sub 5}SiB{sub 2}-Mo{sub 5} Si{sub 3}B{sub x} ternary region. The experimental data for samples in each of …
Date:
December 10, 1999
Creator:
Beckman, Sarah E.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Rains County Leader (Emory, Tex.), Vol. 105, No. 26, Ed. 1 Thursday, December 10, 1992
Weekly newspaper from Emory, Texas that includes local, state, and national news along with advertising.
Date:
December 10, 1992
Creator:
Becknell, Kathleen Hill
Object Type:
Newspaper
System:
The Portal to Texas History
An example of a United States Nuclear Research Center
Under the likely scenario in which public support for nuclear energy remains low and fossil fuels continue to be abundant and cheap, government supported nuclear research centers must adapt their missions to ensure that they tackle problems of current significance. It will be critical to be multidisciplinary, to generate economic value, and to apply nuclear competencies to current problems. Addressing problems in nuclear safety, D and D, nuclear waste management, nonproliferation, isotope production are a few examples of current needs in the nuclear arena. Argonne's original mission, to develop nuclear reactor technology, was a critical need for the U.S. in 1946. It would be wise to recognize that this mission was a special instance of a more general one--to apply unique human and physical capital to long term, high risk technology development in response to society's needs. International collaboration will enhance the collective chances for success as the world moves into the 21st century.
Date:
December 10, 1999
Creator:
Bhattacharyya, S. K.
Object Type:
Article
System:
The UNT Digital Library
[Bigler Family Videos, No. 6 - Christmas Holiday 1990]
This home movie footage excerpt includes footage of the family Christmas tree and baby Christopher talking about Santa Claus and telling his mom what he wants for Christmas.
Date:
December 10, 1990
Creator:
Bigler
Object Type:
Video
System:
The Portal to Texas History