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1,725 Matching Results
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Analysis of Fuel Cell Vehicles Hybridization and Implications for Energy Storage Devices
Presents an analysis of hybridization and implications energy storage devices concerning fuel cell vehicles.
Date:
June 1, 2004
Creator:
Zolot, M.; Markel, T. & Pesaran, A.
Object Type:
Presentation
System:
The UNT Digital Library
Analysis of KEK-ATF optics and coupling using LOCO
LOCO is a computer code for analysis of the linear optics in a storage ring based on the closed orbit response to steering magnets. The analysis provides information on focusing errors, BPM gain and rotation errors, and local coupling. Here, we discuss the details of the LOCO implementation at the KEK-ATF Damping Ring, and report the initial results. Some of the information obtained, for example on the BPM gain and coupling errors, has not previously been determined. We discuss the possibility of using the data provided by the LOCO analysis to reduce the vertical emittance of the ATF beam.
Date:
June 30, 2004
Creator:
Wolski, Andrzej; Woodley, Mark D.; Nelson, Janice & Ross, Marc C.
Object Type:
Article
System:
The UNT Digital Library
Analysis of Recombination Processes in 0.5-0.6 eV Epitaxial GaInAsSb Lattice-matched to GaSb
This work summarizes recent data on minority carrier lifetime in n- and p-type double heterostructures (DHs) of 0.5-0.6 eV GaInAsSb confined with GaSb and AlGaAsSb cap layers. Recombination times were measured by time-resolved photoluminescence (TRPL) and by optical frequency response (OFR) to sinusoidal excitation. It was shown that one of the mechanisms responsible for interface recombination in GaSb/GaInAsSb/GaSb DHs is thermionic emission of carriers over the heterobarrier. Considerable improvement of carrier confinement was obtained with 1 eV AlGaAsSb cap layers. Optimization of the epitaxial growth resulted in a recombination velocity at GaInAsSb/AlGaAsSb interface as low as 30 cm/s.
Date:
June 9, 2004
Creator:
Donetsky, D.; Anikeev, S.; Gu, N.; Belenky, G.; Luryi, S.; Wang, C. A. et al.
Object Type:
Report
System:
The UNT Digital Library
Analysis of Recombination Processes in 0.5 - 0.6eV Epitaxial GaInAsSb Lattice-Matched to GaSb
After a brief introduction and work motivation, static and dynamic methods for minority carrier lifetime measurements will be compared. Data on recombination velocity at heterointerfaces for both p-type and n-type quaternaries will be summarized. Radiative recombination and effect of photon recycling will be considered in detail.
Date:
June 7, 2004
Creator:
Donetsky, D.; Anikeev, S.; Ning, G.; Belenky, G.; Luryi, S.; Wang, C. A. et al.
Object Type:
Report
System:
The UNT Digital Library
Analytical Modeling of Wave Generation by the Borehole OrbitalVibrator Source
The orbital vibrator source (a fluid-coupled shear wave source) has many unique properties that are useful for cross-well, single-well, and borehole-to-surface imaging of both P- (compressional)and S-(shear) wave velocities of reservoir rocks. To this day, however, no standard models for this source have been established, and the mechanism of wave generation and the characteristics of wave field around the source are not well understood yet. In this article, we develop both two and three-dimensional analytical models of the orbital vibrator source, which allow us to examine the source characteristics such as radiation patterns, frequency-dependence of the wave energy, and guided-wave generation. These models are developed in the frequency-wave number domain using the partial wave expansion of the wavefield within and outside the borehole. The results show that the developed models successfully reproduce many characteristics of orbital vibrator source that have been observed in the field, including formation property-dependent vibrator amplitudes, uniform isotropic shear wave radiation pattern, and small tube-wave generation.
Date:
June 28, 2004
Creator:
Nakagawa, Seiji & Daley, Thomas M.
Object Type:
Article
System:
The UNT Digital Library
Annotation of the Clostridium Acetobutylicum Genome
The genome sequence of the solvent producing bacterium Clostridium acetobutylicum ATCC824, has been determined by the shotgun approach. The genome consists of a 3.94 Mb chromosome and a 192 kb megaplasmid that contains the majority of genes responsible for solvent production. Comparison of C. acetobutylicum to Bacillus subtilis reveals significant local conservation of gene order, which has not been seen in comparisons of other genomes with similar, or, in some cases, closer, phylogenetic proximity. This conservation allows the prediction of many previously undetected operons in both bacteria.
Date:
June 9, 2004
Creator:
Daly, M. J.
Object Type:
Report
System:
The UNT Digital Library
Annual Birding & Nature Festivals of Texas: 2004-2005
Annual guide listing festivals in the state of Texas that are related to birds or other wildlife, providing descriptions, dates, and contact information.
Date:
June 2004
Creator:
Texas. Parks and Wildlife Department.
Object Type:
Pamphlet
System:
The Portal to Texas History
Annual Radioactive Waste Tank Inspection Program - 2003
Aqueous radioactive wastes from Savannah River Site (SRS) separations and vitrification processes are contained in large underground carbon steel tanks. Inspections made during 2003 to evaluate these vessels and other waste handling facilities along with evaluations based on data from previous inspections are the subject of this report. The 2003 inspection program revealed that the structural integrity and waste confinement capability of the Savannah River Site waste tanks remained unchanged from 2002. A total of 4249 photographs were made, 1178 visual and video inspections were performed, and 12 helium leak tests were conducted. Ultrasonic testing was performed on five High Level Waste Tanks in accordance with approved inspection plans that met the In-Service Inspection Program requirements.
Date:
June 3, 2004
Creator:
West, William
Object Type:
Report
System:
The UNT Digital Library
Anode Fall Formation in a Hall Thruster
As was reported in our previous work, accurate, nondisturbing near-anode measurements of the plasma density, electron temperature, and plasma potential performed with biased and emissive probes allowed the first experimental identification of both electron-repelling (negative anode fall) and electron-attracting (positive anode fall) anode sheaths in Hall thrusters. An interesting new phenomenon revealed by the probe measurements is that the anode fall changes from positive to negative upon removal of the dielectric coating, which appears on the anode surface during the course of Hall thruster operation. As reported in the present work, energy dispersion spectroscopy analysis of the chemical composition of the anode dielectric coating indicates that the coating layer consists essentially of an oxide of the anode material (stainless steel). However, it is still unclear how oxygen gets into the thruster channel. Most importantly, possible mechanisms of anode fall formation in a Hall thruster with a clean and a coated anodes are analyzed in this work; practical implication of understanding the general structure of the electron-attracting anode sheath in the case of a coated anode is also discussed.
Date:
June 29, 2004
Creator:
Dorf, Leonid A.; Raitses, Yevgeny F.; Smirnov, Artem N. & Fisch, Nathaniel J.
Object Type:
Report
System:
The UNT Digital Library
Answering the Call to Spiritual (Urban) Renewal - Part 1
Lecture given Saturday, June 26, 2004 at Abilene Christian University: "The socio-cultural usefulness of today's church is debatable. Many urban centers lie in virtual ruins. Can the church afford to absolve itself from the process of healing the malaise? Classes will examine the predicament and consider potential strategies for authentic inner-city spiritual renewal."
Date:
June 26, 2004
Creator:
Jarman, Leonard
Object Type:
Sound
System:
The Portal to Texas History
Answering the Call to Spiritual (Urban) Renewal - Part 2
Lecture given Saturday, June 26, 2004 at Abilene Christian University: "The socio-cultural usefulness of today's church is debatable. Many urban centers lie in virtual ruins. Can the church afford to absolve itself from the process of healing the malaise? Classes will examine the predicament and consider potential strategies."
Date:
June 26, 2004
Creator:
Jarman, Leonard
Object Type:
Sound
System:
The Portal to Texas History
Antenna-coupled bolometer arrays using transition-edgesensors
We describe the development of an antenna-coupled bolometer array for use in a Cosmic Microwave Background polarization experiment. Prototype single pixels using double-slot dipole antennas and integrated microstrip band defining filters have been built and tested. Preliminary results of optical testing and simulations are presented. A bolometer array design based on this pixel will also be shown and future plans for application of the technology will be discussed.
Date:
June 8, 2004
Creator:
Myers, Michael J.; Ade, Peter; Engargiola, Greg; Holzapfel,William; Lee,Adrian T.; O'Brient, Roger et al.
Object Type:
Article
System:
The UNT Digital Library
Anti-Money Laundering: Issues Concerning Depository Institution Regulatory Oversight
Testimony issued by the General Accounting Office with an abstract that begins "The U.S. government's framework for preventing, detecting, and prosecuting money laundering has been expanding through additional pieces of legislation since its inception in 1970 with the Bank Secrecy Act (BSA). The purpose of the BSA is to prevent financial institutions from being used as intermediaries for the transfer or deposit of money derived from criminal activity and to provide a paper trail for law enforcement agencies in their investigations of possible money laundering. The most recent changes arose in October 2001 with the passage of the USA PATRIOT Act, which, among other things, extends antimoney laundering (AML) requirements to other financial service providers previously not covered under the BSA. GAO was asked to testify on its previous work and the ongoing work it is doing for the Senate Committee on Banking, Housing, and Urban Affairs on the depository institution regulators' BSA examination and enforcement process."
Date:
June 3, 2004
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Antimony Based III-V Thermophotovoltaic Devices
Antimony-based III-V thermophotovoltaic (TPV) cells are attractive converters for systems with low radiator temperature around 1100 to 1700 K, since these cells potentially can be spectrally matched to the thermal source. Cells under development include GaSb and the lattice-matched GaInAsSb/GaSb and InPAsSb/InAs quaternary systems. GaSb cell technology is the most mature, owing in part to the relative ease in preparation of the binary alloy compared to quaternary GaInAsSb and InPAsSb alloys. Device performance of 0.7-eV GaSb cells exceeds 90% of the practical limit. GaInAsSb TPV cells have been the primary focus of recent research, and cells with energy gap E{sub g} ranging from {approx}0.6 to 0.49 eV have been demonstrated. Quantum efficiency and fill factor approach theoretical limits. Open-circuit voltage factor is as high as 87% of the practical limit for the higher-E{sub g} cells, but degrades to below 80% with decreasing E{sub g} of the alloy, which might be due to Auger recombination. InPAsSb cells are the least studied, and a cell with E{sub g} = 0.45-eV has extended spectral response out to 4.3 {micro}m. This paper briefly reviews the main contributions that have been made for antimonide-based TPV cells, and suggests additional studies for further performance enhancements.
Date:
June 9, 2004
Creator:
Wang, C. A.
Object Type:
Report
System:
The UNT Digital Library
Aperture studies for the Fermilab AP2 anti-proton line
The AP2 beamline transports anti-protons from the production target to the Debuncher ring. The observed aperture is smaller than that estimated from linear, on-energy optics. We have investigated possible reasons for the aperture limitation and have identified possible sources,including residual vertical dispersion from alignment errors and chromatic effects due to very large chromatic lattice functions. Some experiments have already been performed to study these effects. We present results of the experimental and theoretical studies and possible remedies.
Date:
June 23, 2004
Creator:
Reichel, Ina; Placidi, Massimo; Zisman, Mike; Gollwitzer, Keith & Werkema, Steve
Object Type:
Article
System:
The UNT Digital Library
Application of Advanced Gamma Ray Detection Concepts Combined with Real-time Compton Suppression for Nondestructive, Gamma Ray Characterization of Remote-handled Waste
Nondestructive gamma ray characterization of remote-handled waste is significantly complicated by the presence of Compton scattering in the detector and waste matrix produced by the intense cesium gamma ray. This research seeks to understand the photophysics of a new type of inorganic scintillation gamma ray detector, optimize the combination of this gamma ray detector with a Compton guard detector, develop new Monte Carlo solution algorithms for modeling Compton scattering in the waste, and to model the real time intensity of cesium produced Compton scattering. A successful research program will provide the fundamental information needed to design and develop advanced Compton spectrometers for assay of remote handled waste and new higher sensitivity spectrometers for environmental measurements.
Date:
June 1, 2004
Creator:
McIlwain, Michael
Object Type:
Report
System:
The UNT Digital Library
Applications of X-Ray Lasers Utilizing Plasmas that are only a Few Times Ionised
With the advent of tabletop X-ray lasers that operate at high repetition rate more emphasis is being put on finding useful applications for these lasers. The 14.7 nm Ni-like Pd X-ray laser at Lawrence Livermore National Laboratory is being used to do many interferometer experiments. As detailed quantitative comparisons are done between experiments and code simulations it is clear that some of the assumptions used to analyze the experiments need to be modified as one explores plasmas that are only a few times ionized. In the case of aluminium plasmas that have been analyzed with interferometers there has been some unusual behavior where the fringe lines bend the wrong way. In this work we will discuss how the index of refraction for aluminium is far more complicated than generally assumed because there are significant contributions to the index from the continuum and line structure of the bound electrons that can dominate the free electron contribution and even cause the index to be greater than one. We will also discuss some potential applications of the high repetition rate Ne-like Ar X-ray laser at 46.9 nm. In particular we will present modeling that shows how the Ar laser could be used to …
Date:
June 9, 2004
Creator:
Nilsen, Joseph & Scofield, James H
Object Type:
Article
System:
The UNT Digital Library
Appropriations for FY2004: Interior and Related Agencies
This report provides appropriations of Interior and Related Agencies for FY2004.
Date:
June 10, 2004
Creator:
Vincent, Carol Hardy & Boren, Susan
Object Type:
Report
System:
The UNT Digital Library
The Aqueous Thermodynamics and Complexation Reactions of Anionic Silica and Uranium Species to High Concentration
Highly basic tank wastes contain several important radionuclides, including 90Sr, 99Tc, and 60Co, as well as actinide elements (i.e., isotopes of U, Pu, and Am). These highly basic tank wastes are known to have leaked into the vadose zone at the Hanford Site. Upon entering the sediments in the vadose zone, the highly basic solutions dissolve large concentrations of silica from the silica and aluminosilicate minerals present in the subsurface. These dissolution reactions alter the chemical composition of the leaking solutions, transforming them from a highly basic (as high 2M NaOH) solution into a pore solution with a very high concentration of dissolved silica and a significantly reduced pH. This moderately basic (pH 9 to 11), high-silica solution has the potential to complex radionuclides and move through the subsurface. Such strong radionuclide complexation is a currently unconsidered transport vector that has the potential to expedite radionuclide transport through the vad ose zone. These strong complexation effects have the ability to significantly alter current conceptual models of contaminant migration beneath leaking tanks. In this project, we are determining the aqueous thermodynamics and speciation of dissolved silica and silica-radionuclide complexes to high silica concentration. We are also initiating studies of U(VI) speciation …
Date:
June 1, 2004
Creator:
Felmy, Andrew R.
Object Type:
Report
System:
The UNT Digital Library
Archaeological Excavation Report for Proposed Well 199-K-131 in Support of the 100-KR-4 Pump-and-Treat Project
An archaeological excavation was conducted at the site of proposed groundwater monitoring well 199-K-131 in support of the 100-KR-4 Pump-and-Treat Project between June 2 and 3, 2004. Excavations confirmed that there were no intact cultural deposits at the proposed well location. This report was prepared to document the findings of the test excavation.
Date:
June 22, 2004
Creator:
Woody, Dave M. & Prendergast-Kennedy, Ellen L.
Object Type:
Report
System:
The UNT Digital Library
The Archer Advocate (Holliday, Tex.), Vol. 2, No. 10, Ed. 1 Wednesday, June 9, 2004
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
June 9, 2004
Creator:
Thomas, John
Object Type:
Newspaper
System:
The Portal to Texas History
The Archer Advocate (Holliday, Tex.), Vol. 2, No. 11, Ed. 1 Wednesday, June 16, 2004
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
June 16, 2004
Creator:
Thomas, John
Object Type:
Newspaper
System:
The Portal to Texas History
The Archer Advocate (Holliday, Tex.), Vol. 2, No. 12, Ed. 1 Wednesday, June 23, 2004
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
June 23, 2004
Creator:
Thomas, John
Object Type:
Newspaper
System:
The Portal to Texas History
The Archer Advocate (Holliday, Tex.), Vol. 2, No. 13, Ed. 1 Wednesday, June 30, 2004
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
June 30, 2004
Creator:
Thomas, John
Object Type:
Newspaper
System:
The Portal to Texas History