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[Studies of non-linear dynamics of dissipative systems]. [Final report, April 1, 1988--October 31, 1989]
In the period of this grant I worked on three main areas: (1) Symmetries in inviscid flow equations in one, two, and three dimensions and related nonlinear stability theorems for these flows; (2) applications of Hamiltonian mechanics to the problems of shallow water equations and internal wave dynamics in oceanic flows; and, (3) analysis of signals from chaotic systems with an eye toward learning how to build models of chaotic systems in nature.
Date:
September 10, 1990
Creator:
Abarbanel, D. I.
Object Type:
Report
System:
The UNT Digital Library
(Studies of non-linear dynamics of dissipative systems)
In the period of this grant I worked on three main areas: (1) Symmetries in inviscid flow equations in one, two, and three dimensions and related nonlinear stability theorems for these flows; (2) applications of Hamiltonian mechanics to the problems of shallow water equations and internal wave dynamics in oceanic flows; and, (3) analysis of signals from chaotic systems with an eye toward learning how to build models of chaotic systems in nature.
Date:
September 10, 1990
Creator:
Abarbanel, D.I.
Object Type:
Report
System:
The UNT Digital Library
Radiative higgs boson decays H {yields} f{anti f}{gamma}
Higgs boson radiative decays of the form H {r_arrow} f{ovr f}{gamma} are calculated in the Standard Model using the complete one-loop expressions for the decay amplitudes. Contributions to the radiative width from leptons and light quarks are given. We also present e{ovr e} invariant mass distributions for H {r_arrow} e{ovr e}{gamma}, which illustrate the importance of the photon pole contribution and the effects of the box diagrams. 4 refs., 6 figs.
Date:
October 10, 1996
Creator:
Abbasabadi, A.; Bowser-Chao, D.; Repko, W.W. & Dicus, D.A.
Object Type:
Report
System:
The UNT Digital Library
A Preliminary measurement of the gluon splitting rate into b\bar{b} pairs in hadronic Z0 decays
We present a measurement of the rate of gluon splitting into bottom quarks, g --> b anti-b, in hadronic Z<sup>0</sup> decays collected by SLD from 1996 to 1998. The analysis was performed by looking for secondary bottom production in 4-jet events of any primary avor. A topological vertex mass technique was used to tag the two jets with the smallest angle between them as b/anti-b. We obtained a rate of g --> b anti-b per hadronic event to be (3.07 ± 0.71(stat:) ± 0.66(syst:)) × 10³ (preliminary).
Date:
June 10, 1999
Creator:
Abe, Toshinori
Object Type:
Report
System:
The UNT Digital Library
[RE: Attached Letter and Invitation List]
Photocopy of a memo from Julie Abel, program associate at the Getty Center for Education in the Arts, to the Regional and California Institute Directors. The memo is in regards to an attached letter and invitation list of invitees to the regional funder's meeting, October 9th, 1993. The letter, dated August 9, 1993, is from Vicki Rosenberg, program officer of the Getty Center for Education in the Arts, to Bob Crow, executive director of the Amon G. Carter Foundation, inviting him to the meeting. The Center is hosting the meeting to recognize the partnerships that have grown over the past five years. Another letter, dated the same and also from Vicki Rosenberg is present, but addressed to Mark Constantine, consultant at Jessie Ball duPont Fund and has the same invitation.
Date:
August 10, 1993
Creator:
Abel, Julie
Object Type:
Letter
System:
The UNT Digital Library
[RE: Attached Letter and Invitation List]
Photocopy of a memo from Julie Abel, program associate at the Getty Center for Education in the Arts, to the Regional and California Institute Directors. The memo is in regards to an attached letter and invitation list of invitees to the regional funder's meeting, October 9th, 1993. The letter, dated August 9, 1993, is from Vicki Rosenberg, program officer of the Getty Center for Education in the Arts, to Bob Crow, executive director of the Amon G. Carter Foundation, inviting him to the meeting. The Center is hosting the meeting to recognize the partnerships that have grown over the past five years. Another letter, dated the same and also from Vicki Rosenberg is present, but addressed to Mark Constantine, consultant at Jessie Ball duPont Fund and has the same invitation.
Date:
August 10, 1993
Creator:
Abel, Julie
Object Type:
Letter
System:
The UNT Digital Library
III-Nitride Dry Etching - Comparison of Inductively Coupled Plasma Chemistries
A systematic study of the etch characteristics of GaN, AlN and InN has been performed with boron halides- (BI{sub 3} and BBr{sub 3}) and interhalogen- (ICl and IBr) based Inductively Coupled Plasmas. Maximum etch selectivities of -100:1 were achieved for InN over both GaN and AlN in the BI{sub 3} mixtures due to the relatively high volatility of the InN etch products and the lower bond strength of InN. Maximum selectivies of- 14 for InN over GaN and >25 for InN over AlN were obtained with ICl and IBr chemistries. The etched surface morphologies of GaN in these four mixtures are similar or better than those of the control sample.
Date:
November 10, 1998
Creator:
Abernathy, C.R.; Cho, H.; Donovan, S.M.; Hahn, Y-B.; Han, J.; Hays, D.C. et al.
Object Type:
Article
System:
The UNT Digital Library
[Abilene City Council Minutes: 1991]
Ledger containing minutes of the City Council in Abilene, Texas documenting the group's discussions and activities from January 10, 1991 to December 19, 1991.
Date:
1991-01-10/1991-12-19
Creator:
Abilene (Tex.)
Object Type:
Book
System:
The Portal to Texas History
A novel approach to highly dispersing catalytic materials in coal for gasification. Ninth quarterly report, October 1, 1991--December 31, 1991
This project seeks to develop a technique, based on coal surface properties, for highly dispersing catalysts in coal for gasification and to investigate the potential of using potassium carbonate and calcium acetate mixtures as catalysts for coal gasification. The lower cost and higher catalytic activity of the latter compound will produce economic benefits by reducing the amount of K{sub 2}CO{sub 3} required for high coal char reactivities. As was shown in previous reports, coal loading with potassium or calcium at different pHs produced CO{sub 2} gasification activities which increased in the order pH 6 > pH 10 {much_gt} pH 1. The current report shows that a similar trend was obtained when calcium and potassium were simultaneously loaded and char reaction times were less than about 75 min. Beyond this time, the coal impregnated with catalyst at pH 1 became more reactive, reaching 100% conversion after 1.5h. X-ray diffraction analysis suggest that the catalysts are well dispersed around pH 1 and 6 whereas reduced dispersion as obtained at pH 10. The reactivities are independent of the surface areas of the coals.
Date:
February 10, 1992
Creator:
Abotsi, G. M. K. & Bota, K. B.
Object Type:
Report
System:
The UNT Digital Library
A novel approach to highly dispersing catalytic materials in coal for gasification
This project seeks to develop a technique, based on coal surface properties, for highly dispersing catalysts in coal for gasification and to investigate the potential of using potassium carbonate and calcium acetate mixtures as catalysts for coal gasification. The lower cost and higher catalytic activity of the latter compound will produce economic benefits by reducing the amount of K{sub 2}CO{sub 3} required for high coal char reactivities. As was shown in previous reports, coal loading with potassium or calcium at different pHs produced CO{sub 2} gasification activities which increased in the order pH 6 > pH 10 {much gt} pH 1. The current report shows that a similar trend was obtained when calcium and potassium were simultaneously loaded and char reaction times were less than about 75 min. Beyond this time, the coal impregnated with catalyst at pH 1 became more reactive, reaching 100% conversion after 1.5h. X-ray diffraction analysis suggest that the catalysts are well dispersed around pH 1 and 6 whereas reduced dispersion as obtained at pH 10. The reactivities are independent of the surface areas of the coals.
Date:
February 10, 1992
Creator:
Abotsi, G.M.K. & Bota, K.B.
Object Type:
Report
System:
The UNT Digital Library
Analysis of Ignition Testing on K-West Basin Fuel
Approximately 2100 metric tons of spent nuclear fuel (SNF) discharged from the N-Reactor have been stored underwater at the K-Basins in the 100 Area of the Hanford Site. The spent fuel has been stored in the K-East Basin since 1975 and in the K-West Basin since 1981. Some of the SNF elements in these basins have corroded because of various breaches in the Zircaloy cladding that occurred during fuel discharge operations and/or subsequent handling and storage in the basins. Consequently, radioactive material in the fuel has been released into the basin water, and water has leaked from the K-East Basin into the soil below. To protect the Columbia River, which is only 380 m from the basins, the SNF is scheduled to be removed and transported for interim dry storage in the 200 East Area, in the central portion of the Site. However, before being shipped, the corroded fuel elements will be loaded into Multi-Canister OverPacks and conditioned. The conditioning process will be selected based on the Integrated Process Strategy (IPS) (WHC 1995), which was prepared on the basis of the dry storage concept developed by the Independent Technical Assessment (ITA) team (ITA 1994).
Date:
August 10, 1999
Creator:
Abrefah, J.; Huang, F.H.; Gerry, W.M.; Gray, W.J.; Marschman, S.C. & Thornton, T.A.
Object Type:
Report
System:
The UNT Digital Library
Analysis of Ignition Testing on K-West Basin Fuel
Ignition tests and analyses of damage/corroded N-Reactor spent nuclear fuel (SNF) were performed by Pacific Northwest National Laboratory as part of a series of studies on the deteriorating spent fuel in the Hanford K-Basins. The ignition temperature tests were conducted to assess tie pyrophoric properties of selected spent fuel elements from K-West Basin. The objective of these tests was to determine pyrophoric characteristics of samples cut from both damaged and undamaged regions of fhel elements. Furnace ignition tests were also petiormed on samples subjected to the conditioning process proposed by the Independent Technical Assessment and the Integrated Process Strategy to establish any significant effect on the SNF pyrophoric pefiormance parameters. Part of the analysis of the ignition data in this report was petiormed by FIuor Daniel Northwest. One of the safety issues being evaluated is the possibility of a fiel ignition during processing, handling, and transportation to the interim storage facility.
Date:
August 10, 1999
Creator:
Abrefah, John; Huang, Fan-Hsiung F.; Gerry, William M.; Gray, Walter J.; Marschman, Steven C. & Thornton, Thomas A.
Object Type:
Report
System:
The UNT Digital Library
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
Global Climate Change: Selected Legal Questions About the Kyoto Protocol
This report discusses the Kyoto Protocol and whether the United States is now legally bound by the Protocol, the legal implications of signing it, whether it could be implemented as an executive agreement without submission to the Senate, and whether the Protocol could be used as the legal basis for regulation of emissions even prior to ratification.
Date:
April 10, 1998
Creator:
Ackerman, David M.
Object Type:
Report
System:
The UNT Digital Library
”In God We Trust” on the Nation’s Coins and Currency and as the National Motto: History and Constitutionality
This report discusses the history of the use of the phrase "In God We Trust" on the national currency, and the constitutional legality of the practice.
Date:
July 10, 1996
Creator:
Ackerman, David M.
Object Type:
Report
System:
The UNT Digital Library
Jazz Faculty Recital: 1997-09-10 - John Adams, Dan Haerle, Fred Hamilton, Ed Soph, Mike Steinel
Access:
Use of this item is restricted to the UNT Community
A jazz faculty and guest artist recital performed at the UNT College of Music Kenton Hall.
Date:
September 10, 1997
Creator:
Adams, John; Haerle, Dan; Hamilton, Fred (Guitarist); Soph, Ed & Steinel, Mike
Object Type:
Sound
System:
The UNT Digital Library
Fiscal year 1999 waste information requirements document
The Waste Information Requirements Document (WIRD) has the following purposes: To describe the overall drivers that require characterization information and to document their source; To define how characterization is going to satisfy the drivers, close issues, and measure and report progress; and To describe deliverables and acceptance criteria for characterization. Characterization information is required to maintain regulatory compliance, perform operations and maintenance, resolve safety issues, and prepare for disposal of waste. Commitments addressing these requirements are derived from the Hanford Federal Facility Agreement and Consent Order, also known as the Tri-Party Agreement; the Recommendation 93-5 Implementation Plan (DOE-RL 1996a) to the Defense Nuclear Facilities Safety Board (DNFSB); and other requirement sources listed in Section 2.0. The Waste Information Requirements Document replaces the tank waste analysis plans and the tank characterization plan previously required by the Tri-Party Agreement, Milestone M-44-01 and M-44-02 series.
Date:
August 10, 1998
Creator:
Adams, M. R.
Object Type:
Report
System:
The UNT Digital Library
The Paducah Post (Paducah, Tex.), Vol. 84, No. 34, Ed. 1 Wednesday, October 10, 1990
Weekly newspaper from Paducah, Texas that includes local, state, and national news along with advertising.
Date:
October 10, 1990
Creator:
Adams, Patty
Object Type:
Newspaper
System:
The Portal to Texas History
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 status of APS, BESSRC, and NEET.
We present a brief summary of the current status of the Advanced Photon Source (APS) at Argonne National Laboratory and of the facilities at two of the APS sectors operated by the Basic Energy Sciences Synchrotrons Radiation Center (BESSRC). This is followed by a report on recent measurements at BESSRC on the phenomenon of Nuclear Excitation by Electronic Transition (NEET).
Date:
March 10, 1999
Creator:
Ahmad, I.; Dunford, R. W.; Esbensen, H.; Gemmell, D. S.; Kanter, E. P.; Kraessig, B. et al.
Object Type:
Article
System:
The UNT Digital Library
Reciprocal-Space Analysis of Compositional Modulation in Short-Period Superlattices Using Position-Sensitive X-Ray Detection
Epitaxial growth of AlAs-InAs short-period superlattices on (001) InP can lead to heterostructures exhibiting strong, quasi-periodic, lateral modulation of the alloy composition; transverse satellites arise in reciprocal space as a signature of the compositional modulation. Using an x-ray diffractometer equipped with a position-sensitive x-ray detector, we demonstrate reciprocal-space mapping of these satellites as an efficient, nondestructive means for detecting and characterizing the occurrence of compositional modulation. Systematic variations in the compositional modulation due to the structural design and the growth conditions of the short-period superlattice are characterized by routine mapping of the lateral satellites. Spontaneous compositional modulation occurs along the growth front during molecular-beam epitaxy of (AlAs) (InAs)n short-period superlattices. The modulation is quasi-periodic and forms a lateral superlattice superimposed on the intended SPS structure. Corresponding transverse satellites arise about each reciprocal lattice point, and x-ray diffraction can be routinely used to map their local reciprocal-space structure. The integrated intensity, spacing, orientation, and shape of these satellites provide a reliable means for nondestructively detecting and characterizing the compositional modulation in short-period superlattices. The analytical efficiency afforded by the use of a PSD has enabled detailed study of systematic vacations in compositional modulation as a function of the average composition, the …
Date:
November 10, 1998
Creator:
Ahrenkiel, S. P.; Follstaedt, D. M.; Lee, S. R.; Millunchick, J. M.; Norman, A. G.; Reno, J. L. et al.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0393.0431]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Edmond firefighters become familiarized with Medi Flight equipment during a recent visit by the service to an Edmond fire station."
Date:
September 10, 1990
Creator:
Aker, Joe
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Quarterly Technical Progress Report - Investigation of Syngas Interaction in Alcohol Synthesis Catalysts
This report presents the work done on " Investigation of Syngas Interaction in Alcohol Synthesis Catalysts" during the last quarter. The major activity during this period is on FTIR absorption studies of Co/Cr catalysts using CO as a probe molecule. Transition metals cobalt and copper play significant roles in the conversion of syngas (CO + H2 ) to liquid fuels. With a view to examine the nature of interaction between CO and metal, the FTIR spectra of CO adsorbed on Co-Cr2 O3 composites were investigated. The results indicate that as cobalt loading increases, the intensity of the CO adsorption bands increase and several vibrational modes seem to be promoted. Heat treatment of the sample revealed two distinct processes of adsorption. Bands due to physisorption disappeared while bands due to chemisorption not only increased in intensity but persisted even after desorption. It seems that the physisorption process is more active when the catalyst is fresh and is hindered when carbidic/carbonyl formations occur on the metal surfaces.
Date:
November 10, 1998
Creator:
Akundi, Murty A.
Object Type:
Report
System:
The UNT Digital Library