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Unquenched Studies Using the Truncated Determinant Algorithm
A truncated determinant algorithm is used to study the physical effects of the quark eigenmodes associated with eigenvalues below 420 MeV. This initial high statistics study focuses on coarse (6{sup 4}) lattices (with O(a{sup 2}) improved gauge action), light internal quark masses and large physical volumes. Three features of full QCD are examined: topological charge distributions, string breaking as observed in the static energy and the eta prime mass.
Date:
November 29, 2001
Creator:
A. Duncan, E. Eichten and H. Thacker
Object Type:
Article
System:
The UNT Digital Library
QUIET DIRECT SIMULATION OF PLASMAS
None
Date:
November 1, 2001
Creator:
ALBRIGHT, B. J.; DAUGHTON, W. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
A High-Performance VME-Based Acquisition System for Positron Emission Mammography
A prototype for a practical and economical breast imaging system for cancer detection is currently under development at Jefferson Lab. The latest advances in bright, fast, crystal scintillators, compact position-sensitive photomultipliers (PSPMT), and high-performance digitizing and readout electronics are being used to develop a compact imager based on Positron Emission Tomography (PET). To facilitate the performance demands of the detector as well as the high number of readout channels, the data acquisition system is built around an intelligent, self-contained, VME form-factor.
Date:
November 1, 2001
Creator:
Abbott, D.J.; Weisenberger, A.; Majewski, S.; Kieper, D.; Kross, B.; Popov, V. et al.
Object Type:
Article
System:
The UNT Digital Library
Education Vouchers: Constitutional Issues and Cases
This report details the constitutional standards that currently apply to indirect aid programs and summarizes all of the pertinent state and federal court decisions, including the Ohio case that will be heard by the Supreme Court. On September 25, 2001, the Supreme Court agreed to review a case raising the controversial issue of the constitutionality of education vouchers. In Zelman v. Simmons-Harris the Sixth Circuit held Ohio’s Pilot Scholarship Program, which provided up to $2500 to help low-income students in Cleveland’s public schools attend private schools in the city, to violate the establishment of religion clause of the First Amendment.
Date:
November 15, 2001
Creator:
Ackerman, David M.
Object Type:
Report
System:
The UNT Digital Library
Sulfur Polymer Stabilization/Solidification (Spss) Treatability of Los Alamos National Laboratory Mercury Waste.
Brookhaven National Laboratory's Sulfur Polymer Stabilization/Solidification (SPSS) process was used to treat approximately 90kg of elemental mercury mixed waste from Los Alamos National Laboratory. Treatment was carried out in a series of eight batches using a 1 ft{sup 3} pilot-scale mixer, where mercury loading in each batch was 33.3 weight percent. Although leach performance is currently not regulated for amalgamated elemental mercury (Hg) mixed waste, Toxicity Characteristic Leach Procedure (TCLP) testing of SPSS treated elemental mercury waste indicates that leachability is readily reduced to below the TCLP limit of 200 ppb (regulatory requirement following treatment by retort for wastes containing > 260 ppb Hg), and with process optimization, to levels less than the stringent Universal Treatment Standard (UTS) limit of 25 ppb that is applied to waste containing < 260 ppm Hg. In addition, mercury-contaminated debris, consisting of primary glass and plastic containers, as well as assorted mercury thermometers, switches, and labware, was first reacted with SPSS components to stabilize the mercury contamination, then macroencapsulated in the molten SPSS product. This treatment was done by vigorous agitation of the sulfur polymer powder and the comminuted debris. Larger plastic and metal containers were reacted to stabilize internal mercury contamination, and then …
Date:
November 1, 2001
Creator:
Adams, J. W. & Kalb, P. D.
Object Type:
Report
System:
The UNT Digital Library
Ensemble: 2001-11-08 - African Percussion Ensemble
Access:
Use of this item is restricted to the UNT Community
Ensemble performance at the UNT College of Music Concert Hall.
Date:
November 8, 2001
Creator:
African Percussion Ensemble
Object Type:
Sound
System:
The UNT Digital Library
Trade and the Americas
None
Date:
November 9, 2001
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Structure and spectroscopy of transcurium nuclei.
The stability of the superheavy elements depends on the shell corrections which are governed by the single-particle spectra. Ideally one would like to experimentally determine the single-particle levels in the superheavy nuclei but the production of only a few atoms of these nuclides precludes such measurements. One therefore has to identify single-particle levels in the heaviest nuclei which are available in at least nanoCurie amounts. They have studied the structure of such heavy nuclei in the Z=98 region and identified many single-particle states. In particular, they have studied the structure of {sup 251}Cf and {sup 249}Bk by measuring the radiations emitted in the {alpha} decay of {sup 255}Fm and {sup 253}Es. These single-particle spectra can be used to test theoretical models for superheavy elements.
Date:
November 9, 2001
Creator:
Ahmad, I.
Object Type:
Article
System:
The UNT Digital Library
GEM-type detectors using LIGA and etchable glass technologies
Gas electron multipliers (GEMS) have been made by a deep X-ray lithography technique (LIGA process) using synchrotron radiation on polymethylmethacrylate (PMMA) and by UV processes using a UV etchable glass. Gain, stability and rate capability for these detectors are described.The LIGA detectors described consist of PMMA sheets of various thicknesses, 125mm to 350mm, and have 150mm x 150mm square holes spaced with a pitch of 300mm. Thin copper electrodes are plated on the top and bottom surfaces using a Damascene method, followed by electroless plating of the copper onto a palladium-tin base layer. For various thicknesses of PMMA measurements have been made of absolute gain vs. voltage, time stability of gain, and rate capability. The operating gas mixture was usually Ar/CO2 (70/30) gas, but some tests were also done using P10 gas. We also made GEM-like detectors using the UV etchable glass called Foturan, patterned by exposure to UV light and subsequent etching. A few measurements using these detectors will be reported, including avalanche gain and time stability.
Date:
November 2, 2001
Creator:
Ahn, S. K.; Kim, J. G.; Perez-Mendez, V.; Chang, S.; Jackson, K. H.; Kadyk, J. A. et al.
Object Type:
Article
System:
The UNT Digital Library
SO(10) SUSY GUT model with a U(1) x Z2 x Z2 flavor s
An SO(10) SUSY GUT model which leads to maximal atmospheric neutrino mixing and the LMA solar neutrino solution, developed in collaboration with S.M. Barr, is briefly described. Since the model is quantitatively predictive, it can be used to assess the need for a neutrino factory, as shown in collaboration with S. Geer.
Date:
November 1, 2001
Creator:
Albright, Carl H.
Object Type:
Article
System:
The UNT Digital Library
Versatile Data Acquisition and Controls for EPICS using VME-based FPGAs
Field Programmable Gate Arrays (FPGAs) have provided versatile VME based data acquisition and control systems with minimal development times for the Thomas Jefferson National Accelerator Facility (Jefferson Lab). FPGAs have been used to interface with VME controllers using both standard A16 and A24 address modes. VME vector-interrupt capability has also been implemented for timing issues in some applications. FPGA designs have additionally been used to provide controls for various systems by interfacing with Analog to Digital Converters (DAC), interlocks, and other drive signals. These controls can be molded to the individual needs of each system and can provide operators with indicators and controls in EPICS via a VME interface. This allows the developer to choose components and make specifications that are not available commercially. Jefferson Lab has begun developing standard FPGA libraries that result in quick turnaround times and inexpensive designs. There have been approximately eight VME based FPGA designs implanted in one department at Jefferson Lab and they are becoming more widespread. FPGAs continue to become larger and faster enabling systems to be incorporated on one integrated circuit. Inherently, FPGAs can process data faster than many microprocessors due to the small processing overhead associated with a custom FPGA design. …
Date:
November 1, 2001
Creator:
Allison, Trent & Flood, Roger
Object Type:
Article
System:
The UNT Digital Library
HYBRIDIZATION AND PRESSURE EFFECTS IN UTX COMPOUNDS
None
Date:
November 1, 2001
Creator:
Alsmadi, A. M.; Sechovsky, V.; Lacerda, A. H.; Prokes, K.; Kamarad, J.; Brück, E. et al.
Object Type:
Article
System:
The UNT Digital Library
Major Leadership Election Contests in the House of Representatives, 94th - 107th Congresses
None
Date:
November 30, 2001
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Major Leadership Election Contests in the Senate: A 27-Year Survey
None
Date:
November 14, 2001
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Southwest Retort, Volume 54, Number 3, November 2001
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
November 2001
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Newsletter of the Texas Chapter of the American Fisheries Society, Volume 27, Number 3, Fall 2001
Newsletter of the Texas Chapter of the American Fisheries Society containing information about the organization, membership, and field of aquaculture and ecosystem management.
Date:
November 2001
Creator:
American Fisheries Society. Texas Chapter.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Tracings, Volume 19, Number 2, November 2001
Newsletter of the the Anderson County Genealogical Society containing genealogical information such as generation charts, family histories, and lists of records (births, deaths, church records, etc.).
Date:
November 2001
Creator:
Anderson County Genealogical Society
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Interactions of proteins in aqueous ammonium-sulfate solutions:Mixtures of lysozyme and ovalbumin
We present a three-dimensional, time-dependent simulation of a laboratory-scale rod-stabilized premixed turbulent V-flame. The simulations are performed using an adaptive time-dependent low Mach number model with detailed chemical kinetics and a mixture model for differential species diffusion. The algorithm is based on a second-order projection formulation and does not require an explicit sub grid model for turbulence or turbulence chemistry interaction. Adaptive mesh refinement is used to dynamically resolve the flame and turbulent structures. Here, we briefly discuss the numerical procedure and present detailed comparisons with experimental measurements showing that the computation is able to accurately capture the basic flame morphology and associated mean velocity field. Finally, we discuss key issues that arise in performing these types of simulations and the implications of these issues for using computation to form a bridge between turbulent flame experiments and basic combustion chemistry.
Date:
November 10, 2001
Creator:
Anderson, Camille O.; Prausnitz, John M. & Blanch, Harvey W.
Object Type:
Report
System:
The UNT Digital Library
Failure of Stadard Optical Models to Reproduce Neutron Total Cross Section Difference in the W Isotopes
Recently cross section differences among the isotopes{sup 182,184,186}W have been measured as part of a study of total cross sections in the 5-560 MeV energy range. These measurements show oscillations up to 150 mb between 5 and 100 MeV. Spherical and deformed phenomenological optical potentials with typical radial and isospin dependences show very small oscillations, in disagreement with the data. In a simple Ramsauer model, this discrepancy can be traced to a cancellation between radial and isospin effects. Understanding this problem requires a more detailed model that incorporates a realistic description of the neutron and proton density distributions. This has been done with results of Hartree-Fock-Bogolyubov calculations using the Gogny force, together with a microscopic folding model employing a modification of the JLM potential as an effective interaction. This treatment yields a satisfactory interpretation of the observed total cross section differences.
Date:
November 1, 2001
Creator:
Anderson, J. D.; Bauer, R. W.; Dietrich, F. S.; Grimes, S. M.; Finlay, R. W.; Abfalterer, W. P. et al.
Object Type:
Article
System:
The UNT Digital Library
SEPARATION OF CO2 FROM FLUE GASES BY CARBON-MULTIWALL CARBON NANOTUBE MEMBRANES
Multiwalled carbon nanotubes (MWNT) were found to be an effective separation media for removing CO{sub 2} from N{sub 2}. The separation mechanism favors the selective condensation of CO{sub 2} from the flowing gas stream. Significant uptakes of CO{sub 2} were measured at 30 C, 150 C and 300 C over the pressure range 0.5 to 5 bar. No measurable uptake of nitrogen was found for this range of conditions. The mass uptake of CO{sub 2} by MWNT was found to increase with increasing temperature. A packed bed of MWNT completely removed CO{sub 2} from a flowing stream of CO{sub 2}/N{sub 2}, and exhibited rapid uptake kinetics for CO{sub 2}.
Date:
November 1, 2001
Creator:
Andrews, Rodney
Object Type:
Report
System:
The UNT Digital Library
Individuals with Disabilities Education Act (IDEA): Identification and Misidentification of Children with Disabilities
This report discusses issues related to the identification and misidentification of children with disabilities.
Date:
November 20, 2001
Creator:
Apling, Richard N.
Object Type:
Report
System:
The UNT Digital Library
Joseph H. Williams Tallgrass Prairie Preserve
Photograph of a scene during the Annual Buffalo roundup, at the Joseph H. Williams Tallgrass Prairie Preserve.
Date:
November 13, 2001
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Joseph H. Williams Tallgrass Prairie Preserve
Photograph of a scene during the Annual Buffalo roundup, at the Joseph H. Williams Tallgrass Prairie Preserve.
Date:
November 13, 2001
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Joseph H. Williams Tallgrass Prairie Preserve
Photograph of a scene during the Annual Buffalo roundup, at the Joseph H. Williams Tallgrass Prairie Preserve.
Date:
November 13, 2001
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History