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789 Matching Results
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[News Clip: Justin Obit]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
February 27, 2001, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Lightning House]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story about house damages due to a lightning.
Date:
February 27, 2001, 4:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: P-Military Bush]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story about an accident with the US navy, international relations with dictator Saddam Hussain, and spy Robert Hansen's betrayal.
Date:
February 27, 2001
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Springsteen]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story about a concert in New Jersey.
Date:
February 27, 2001, 4:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Toddler Fall]
B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
February 27, 2001, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
North Korea's Nuclear Weapons Program
None
Date:
February 27, 2001
Creator:
Niksch, Larry A.
Object Type:
Report
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 84, No. 111, Ed. 1 Tuesday, February 27, 2001
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 27, 2001
Creator:
McFall, Amy
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Open and Closed Magnetic Confinement Systems: Is There a Fundamental Difference in Their Transport Properties?
The results of five decades of experimental investigations of open-ended and closed magnetic confinement geometries are examined to see if intrinsic topology-dependent differences in their cross-field transport can be discerned. The evidence strongly supports a picture in which closed systems (stellarators, tokamaks, reversed-field pinches, etc.) are in all cases studied to date characterized by some level of plasma turbulence, leading to substantial deviations from purely classical cross-field transport. This transport is often describable as a Bohm-like scaling with plasma temperature and magnetic field intensity. By contrast, open systems have in many significant examples been able to approach closely to classically predicted cross-field transport, including cases where the transport appeared to be more than five orders of magnitude slower than the Bohm-diffusion rate. To explain these differences the following tentative hypothesis is put forward: The differences arise from two sources: (1) differences in the instability driving terms arising from free-energy sources, such as current flow along the field lines, etc. and, (2) differences in the nature of the boundary conditions for the various unstable waves that may be stimulated by these free energy sources within the plasma. By analogy with a laser, closed systems, with their flux tubes returning on themselves, …
Date:
February 27, 2001
Creator:
Post, R F
Object Type:
Article
System:
The UNT Digital Library
Optical spectroscopy of strongly correlated electron systems
In this thesis, both time-resolved, nonlinear optical spectroscopy and linear spectroscopy are used to investigate the interactions and dynamics of elementary excitations in strongly correlated electron systems. In the first part, we investigate the renormalization of magnetic elementary excitations in the transition metal oxide Cr{sub 2}O{sub 3}. We have created a non-equilibrium population of antiferromagnetic spin waves and characterized its dynamics, using frequency- and time-resolved optical spectroscopy of the exciton-magnon transition. We observed a time-dependent pump-probe line shape, which results from excitation induced renormalization of the spin wave band structure. We present a model that reproduces the basic characteristics of the data, in which we postulate the optical nonlinearity to be dominated by interactions with long-wavelength spin waves, and the dynamics due to spin wave thermalization. Using linear spectroscopy, coherent third-harmonic generation and pump-probe experiments, we measured the optical properties of the charge-transfer (CT) gap exciton in Sr{sub 2}CuO{sub 2}Cl{sub 2}, an undoped model compound for high-temperature superconductors. A model is developed which explains the pronounced temperature dependence and newly observed Urbach tail in the linear absorption spectrum by a strong, phonon-mediated coupling between the charge-transfer exciton and ligand field excitations of the Cu atoms. The third-order nonlinear optical susceptibility …
Date:
February 27, 2001
Creator:
Schumacher, Andreas B.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Optimization of Surfactant Mixtures and Their Interfacial Behavior for Advanced Oil Recovery
The goal of this report is to develop improved extraction processes to mobilize and produce the oil left untapped using conventional techniques. Current chemical schemes for recovering the residual oil have been in general less than satisfactory. High cost of the processes as well as significant loss of chemicals by adsorption on reservoir materials and precipitation has limited the utility of chemical-flooding operations. There is a need to develop cost-effective, improved reagent schemes to increase recovery from domestic oil reservoirs. The goal of the report was to develop and evaluate novel mixtures of surfactants for improved oil recovery.
Date:
February 27, 2001
Creator:
Somasundaran, Prof. P.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Mary Margaret Hall Doyen, February 27, 2001
Interview with Mary Margaret Hall Doyen from Kerrville, Texas. The interview includes her stories of her family businesses and life in Kerrville.
Date:
February 27, 2001
Creator:
Doyen, Mary Margaret Hall; Bethel, Ann & Snodgrass, Clarabelle
Object Type:
Video
System:
The Portal to Texas History
A physical approach to protein structure prediction: CASP4 results
None
Date:
February 27, 2001
Creator:
Crivelli, Silvia; Eskow, Elizabeth; Bader, Brett; Lamberti, Vincent; Byrd, Richard; Schnabel, Robert et al.
Object Type:
Article
System:
The UNT Digital Library
R-MATRIX RESONANCE ANALYSIS AND STATISTICAL PROPERTIES OF THE RESONANCE PARAMETERS OF 233U IN THE NEUTRON ENERGY RANGE FROM THERMAL TO 600 eV
The R-matrix resonance analysis of experimental neutron transmission and cross sections of {sup 233}U, with the Reich-Moore Bayesian code SAMMY, was extended up to the neutron energy of 600 eV by taking advantage of new high resolution neutron transmission and fission cross section measurements performed at the Oak Ridge Electron Linear Accelerator (ORELA). The experimental data base is described. In addition to the microscopic data (time-of-flight measurements of transmission and cross sections), some experimental and evaluated integral quantities were included in the data base. Tabulated and graphical comparisons between the experimental data and the SAMMY calculated cross sections are given. The ability of the calculated cross sections to reproduce the effective multiplication factors k{sub eff} for various thermal, intermediate, and fast systems was tested. The statistical properties of the resonance parameters were examined and recommended values of the average s-wave resonance parameters are given.
Date:
February 27, 2001
Creator:
Leal, L.C.
Object Type:
Report
System:
The UNT Digital Library
Radial Patterns of Instability and Transport in JT-60U Internal Transport Barrier Discharges
One class of internal transport barrier discharges in the JT-60U tokamak is characterized by two relatively flatter regions of the pressure separated by a region with very large pressure gradient. Linear growth rates for toroidal drift-type modes are calculated for discharges in this class, without and with sheared E x B rotation effects. For cases with fully-developed barriers, the results with rotation are consistent with a picture in which the radial electric field generated in part by the steep pressure gradient causes local stabilization, and thus reduction of the local anomalous transport, which allows the steep pressure gradient to persist. If rotation is omitted from the calculation for these cases, or if rotation is included for cases without barriers or with partially developed barriers, the unstable region spreads into the steep pressure gradient region.
Date:
February 27, 2001
Creator:
Rewoldt, G.; Hill, K.W.; Nazikian, R.; Tang, W.M.; Shirai, H; Sakamoto, Y. et al.
Object Type:
Report
System:
The UNT Digital Library
Rains County Leader (Emory, Tex.), Vol. 113, No. 37, Ed. 1 Tuesday, February 27, 2001
Weekly newspaper from Emory, Texas that includes local, state, and national news along with advertising.
Date:
February 27, 2001
Creator:
Hill, Earl Clyde, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
Responsive Copolymers for Enhanced Petroleum Recovery
The objectives of this work was to: synthesize responsive copolymer systems; characterize molecular structure and solution behavior; measure rheological properties of aqueous fluids in fixed geometry flow profiles; and to tailor final polymer compositions for in situ rheology control under simulated conditions. This report focuses on the synthesis and characterization of novel stimuli responsive copolymers, the investigation of dilute polymer solutions in extensional flow and the design of a rheometer capable of measuring very dilute aqueous polymer solutions at low torque.
Date:
February 27, 2001
Creator:
McCormick, C. & Hester, R.
Object Type:
Report
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 85, No. 142, Ed. 1 Tuesday, February 27, 2001
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 27, 2001
Creator:
Quinnelly, Lorrie J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Statistical Scalability Analysis of Communication Operations in Distributed Applications
Current trends in high performance computing suggest that users will soon have widespread access to clusters of multiprocessors with hundreds, if not thousands, of processors. This unprecedented degree of parallelism will undoubtedly expose scalability limitations in existing applications, where scalability is the ability of a parallel algorithm on a parallel architecture to effectively utilize an increasing number of processors. Users will need precise and automated techniques for detecting the cause of limited scalability. This paper addresses this dilemma. First, we argue that users face numerous challenges in understanding application scalability: managing substantial amounts of experiment data, extracting useful trends from this data, and reconciling performance information with their application's design. Second, we propose a solution to automate this data analysis problem by applying fundamental statistical techniques to scalability experiment data. Finally, we evaluate our operational prototype on several applications, and show that statistical techniques offer an effective strategy for assessing application scalability. In particular, we find that non-parametric correlation of the number of tasks to the ratio of the time for individual communication operations to overall communication time provides a reliable measure for identifying communication operations that scale poorly.
Date:
February 27, 2001
Creator:
Vetter, J S & McCracken, M O
Object Type:
Article
System:
The UNT Digital Library
Surface Figure Metrology for CELT Primary Mirror Segments
The University of California and California Institute of Technology are currently studying the feasibility of building a 30-m segmented ground based optical telescope called the California Extremely Large Telescope (CELT). The early ideas for this telescope were first described by Nelson and Mast and more recently refined by Nelson. In parallel, concepts for the fabrication of the primary segments were proposed by Mast, Nelson and Sommargren where high risk technologies were identified. One of these was the surface figure metrology needed for fabricating the aspheric mirror segments. This report addresses the advanced interferometry that will be needed to achieve 15nm rms accuracy for mirror segments with aspheric departures as large as 35mm peak-to-valley. For reasons of cost, size, measurement consistency and ease of operation we believe it is desirable to have a single interferometer that can be universally applied to each and every mirror segment. Such an instrument is described in this report.
Date:
February 27, 2001
Creator:
Sommargren, G; Phillion, D; Seppala, L & Lerner, S
Object Type:
Report
System:
The UNT Digital Library
Tax Activity in the 106th Congress
None
Date:
February 27, 2001
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Tiger (San Antonio, Tex.), Vol. 52, No. 5, Ed. 1 Tuesday, February 27, 2001
Monthly student newspaper from St. Philip's College in San Antonio, Texas that includes campus news along with advertising.
Date:
February 27, 2001
Creator:
Candia, Patti; Christine, Glynis & Agold, Cynthia
Object Type:
Newspaper
System:
The Portal to Texas History
Time Scaling of the Rates of Produced Fluids in Laboratory Displacements
In this report, the use of an asymptotic method, based on the time scaling of the ratio of produced fluids, to infer the relative permeability exponent of the displaced phase near its residual saturation, for immiscible displacements in laboratory cores was proposed. Sufficiently large injection rates, the existence of a power law can be detected, and its exponent inferred, by plotting in an appropriate plot the ratio of the flow rates of the two fluids at the effluent for some time after breakthrough.
Date:
February 27, 2001
Creator:
Laroche, Catherine; Chen, Min; Yortsos, Yanis C. & Kamath, Jairam
Object Type:
Report
System:
The UNT Digital Library
University of Alabama v. Garrett: Federalism Limits on the Americans with Disabilities Act
None
Date:
February 27, 2001
Creator:
Jones, Nancy Lee
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 103, No. 310, Ed. 1 Wednesday, February 27, 2002
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 27, 2002
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History