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Aspects of the SrO-CuO-TiO2 Ternary System Related to the Deposition of SrTiO3 and Copper-Doped SrTiO3 Thin-Film Buffer Layers
YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} (YBCO) coated conductors are promising materials for large-scale superconductivity applications. One version of a YBCO coated conductor is based on ion beam assisted deposition (IBAD) of magnesium oxide (MgO) onto polycrystalline metal substrates. SrTiO{sub 3} (STO) is often deposited by physical vapor deposition (PVD) methods as a buffer layer between the YBCO and IBAD MgO due to its chemical stability and lattice mismatch of only {approx}1.5% with YBCO. In this work, some aspects of the stability of STO with respect to copper (Cu) and chemical solution deposition of STO on IBAD MgO templates were examined. Solubility limits of Cu in STO were established by processing Cu-doped STO powders by conventional bulk preparation techniques. The maximum solubility of Cu in STO was {approx}1% as determined by transmission electron microscopy (TEM) and Rietveld refinements of x-ray diffraction (XRD) data. XRD analysis, performed in collaboration with NIST, on powder compositions on the STO/SrCuO{sub 2} tie line did not identify any ternary phases. SrCu{sub 0.10}Ti{sub 0.90}O{sub y} buffer layers were prepared by pulsed laser deposition (PLD) and CSD on IBAD MgO flexible metallic textured tapes. TEM analysis of a {approx}100 nm thick SrCu{sub 0.10}Ti{sub 0.90}O{sub y} buffer layer deposited by …
Date:
December 20, 2004
Creator:
Ayala, A.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
ASSESSMENT OF GENOTOXIC ACTIVITY OF PETROLEUM HYDROCARBON-BIOREMEDIATED SOIL
The relationship between toxicity and soil contamination must be understood to develop reliable indicators of environmental restoration for bioremediation. Two bacterial rapid bioassays: SOS chromotest and umu-test with and without metabolic activation (S-9 mixture) were used to evaluate genotoxicity of petroleum hydrocarbon-contaminated soil following bioremediation treatment. The soil was taken from an engineered biopile at the Czor Polish oil refinery. The bioremediation process in the biopile lasted 4 years, and the toxicity measurements were done after this treatment. Carcinogens detected in the soil, polyaromatic hydrocarbons (PAHs), were reduced to low concentrations (2 mg/kg dry wt) by the bioremediation process. Genotoxicity was not observed for soils tested with and without metabolic activation by a liver homogenate (S-9 mixture). However, umu-test was more sensitive than SOS-chromotest in the analysis of petroleum hydrocarbon-bioremediated soil. Analytical results of soil used in the bioassays confirmed that the bioremediation process reduced 81 percent of the petroleum hydrocarbons including PAHs. We conclude that the combined test systems employed in this study are useful tools for the genotoxic examination of remediated petroleum hydrocarbon-contaminated soil.
Date:
October 20, 2004
Creator:
BRIGMON, ROBIN
Object Type:
Report
System:
The UNT Digital Library
High Efficiency Amorphous and Microcrystalline Silicon Based Double-Junction Solar Cells made with Very-High-Frequency Glow Discharge
We have achieved a total-area initial efficiency of 11.47% (active-area efficiency of 12.33%) on a-Si:H/μc-Si:H double-junction structure, where the intrinsic layer bottom cell was made in 50 minutes. On another device in which the bottom cell was made in 30 min, we achieved initial total-area efficiency of 10.58% (active-efficiency of 11.35%). We have shown that the phenomenon of ambient degradation of both μc-Si:H single-junction and a-Si:H/μc-Si:H double-junction cells can be attributed to impurity diffusion after deposition. Optimization of the plasma parameters led to alleviation of the ambient degradation. Appropriate current matching between the top and bottom component cells has resulted in a stable total-area efficiency of 9.7% (active-area efficiency of 10.42%) on an a-Si:H/μc-Si:H double-junction solar cell in which the deposition time for the μc-Si:H intrinsic layer deposition was of 30 min.
Date:
October 20, 2004
Creator:
Banerjee, Arindam
Object Type:
Report
System:
The UNT Digital Library
A fourth order accurate adaptive mesh refinement method forpoisson's equation
We present a block-structured adaptive mesh refinement (AMR) method for computing solutions to Poisson's equation in two and three dimensions. It is based on a conservative, finite-volume formulation of the classical Mehrstellen methods. This is combined with finite volume AMR discretizations to obtain a method that is fourth-order accurate in solution error, and with easily verifiable solvability conditions for Neumann and periodic boundary conditions.
Date:
August 20, 2004
Creator:
Barad, Michael & Colella, Phillip
Object Type:
Article
System:
The UNT Digital Library
Comparative genomic analysis reveals a distant liver enhancer upstream of the COUP-TFII gene
COUP-TFII is a central nuclear hormone receptor that tightly regulates the expression of numerous target lipid metabolism genes in vertebrates. However, it remains unclear how COUP-TFII itself is transcriptionally controlled since studies with its promoter and upstream region fail to recapitulate the genes liver expression. In an attempt to identify liver enhancers in the vicinity of COUP-TFII, we employed a comparative genomic approach. Initial comparisons between humans and mice of the 3,470kb gene poor region surrounding COUP-TFII revealed 2,023 conserved non-coding elements. To prioritize a subset of these elements for functional studies, we performed further genomic comparisons with the orthologous pufferfish (Fugu rubripes) locus and uncovered two anciently conserved non-coding sequences (CNS) upstream of COUP-TFII (CNS-62kb and CNS-66kb). Testing these two elements using reporter constructs in liver (HepG2) cells revealed that CNS-66kb, but not CNS-62kb, yielded robust in vitro enhancer activity. In addition, an in vivo reporter assay using naked DNA transfer with CNS-66kb linked to luciferase displayed strong reproducible liver expression in adult mice, further supporting its role as a liver enhancer. Together, these studies further support the utility of comparative genomics to uncover gene regulatory sequences based on evolutionary conservation and provide the substrates to better understand the …
Date:
August 20, 2004
Creator:
Baroukh, Nadine; Ahituv, Nadav; Chang, Jessie; Shoukry, Malak; Afzal, Veena; Rubin, Edward M. et al.
Object Type:
Article
System:
The UNT Digital Library
Integrated Design and Production Reference Integration with ArchGenXML V1.00
ArchGenXML is a tool that allows easy creation of Zope products through the use of Archetypes. The Integrated Design and Production Reference (IDPR) should be highly configurable in order to meet the needs of a diverse engineering community. Ease of configuration is key to the success of IDPR. The purpose of this paper is to describe a method of using a UML diagram editor to configure IDPR through ArchGenXML and Archetypes.
Date:
July 20, 2004
Creator:
Barter, R H
Object Type:
Report
System:
The UNT Digital Library
Defense Cleanup and Environmental Programs: Authorization and Appropriations for FY2005
This report provides background information on each defense-related environmental program, discusses key funding issues, and examines relevant provisions in authorization legislation and appropriations for FY2005.
Date:
December 20, 2004
Creator:
Bearden, David M.
Object Type:
Report
System:
The UNT Digital Library
High-resolution crystal spectrometer for the 10-60 (angstrom) EUV region
A vacuum crystal spectrometer with nominal resolving power approaching 1000 is described for measuring emission lines with wavelength in the extreme ultraviolet region up to 60 Angstroms. The instrument utilizes a flat octadecyl hydrogen maleate (OHM) crystal and a thin-window 1-D position-sensitive gas proportional detector. This detector employs a 1 {micro}m-thick 100 x8 mm{sup 2} aluminized polyimide window and operates at one atmosphere pressure. The spectrometer has been implemented on the Livermore electron beam ion traps. The performance of the instrument is illustrated in measurements of the newly discovered magnetic field-sensitive line in Ar{sup 8+}.
Date:
February 20, 2004
Creator:
Beiersdorfer, P; Brown, G V; Goddard, R & Wargelin, B J
Object Type:
Article
System:
The UNT Digital Library
X-ray Polarization Measurements at Relativistic Laser Intensities
An effort has been started to measure the short pulse laser absorption and energy partition at relativistic laser intensities up to 10{sup 21} W/cm{sup 2}. Plasma polarization spectroscopy is expected to play an important role in determining fast electron generation and measuring the electron distribution function.
Date:
March 20, 2004
Creator:
Beiersdorfer, P; Shepherd, R; Mancini, R C; Chen, H; Dunn, J; Keenan, R et al.
Object Type:
Article
System:
The UNT Digital Library
The Rice Thresher, Vol. 91, No. 20, Ed. 1 Friday, February 20, 2004
A weekly student newspaper from the Rice University in Houston, Texas that includes campus news and commentaries along with advertising.
Date:
February 20, 2004
Creator:
Berenson, Mark
Object Type:
Newspaper
System:
The Portal to Texas History
Reactive Transport Modeling of the Yucca Mountain Site, Nevada
The Yucca Mountain site has a dry climate and deep water table, with the repository located in the middle of an unsaturated zone approximately 600 m thick. Radionuclide transport processes from the repository to the water table are sensitive to the unsaturated zone flow field, as well as to sorption, matrix diffusion, radioactive decay, and colloid transport mechanisms. The unsaturated zone flow and transport models are calibrated against both physical and chemical data, including pneumatic pressure, liquid saturation, water potential, temperature, chloride, and calcite. The transport model predictions are further compared with testing specific to unsaturated zone transport: at Alcove 1 in the Exploratory Studies Facility (ESF), at Alcove 8 and Niche 3 of the ESF, and at the Busted Butte site. The models are applied to predict the breakthroughs at the water table for nonsorbing and sorbing radionuclides, with faults shown as the important paths for radionuclide transport. Daughter products of some important radionuclides, such as {sup 239}Pu and {sup 241}Am, have faster transport than the parents and must be considered in the unsaturated zone transport model. Colloid transport is significantly affected by colloid size, but only negligibly affected by lunetic declogging (reverse filtering) mechanisms. Unsaturated zone model uncertainties …
Date:
April 20, 2004
Creator:
Bodvarsson, G.
Object Type:
Article
System:
The UNT Digital Library
Storing Waste in Ceramic
Not all the nuclear waste destined for Yucca Mountain is in the form of spent fuel. Some of it will be radioactive waste generated from the production of nuclear weapons. This so-called defense waste exists mainly as corrosive liquids and sludge in underground tanks. An essential task of the U.S. high-level radioactive waste program is to process these defense wastes into a solid material--called a waste form. An ideal waste form would be extremely durable and unreactive with other repository materials. It would be simple to fabricate remotely so that it could be safely transported to a repository for permanent storage. What's more, the material should be able to tolerate exposure to intense radiation without degradation. And to minimize waste volume, the material must be able to contain high concentrations of radionuclides. The material most likely to be used for immobilization of radioactive waste is glass. Glasses are produced by rapid cooling of high-temperature liquids such that the liquid-like non-periodic structure is preserved at lower temperatures. This rapid cooling does not allow enough time for thermodynamically stable crystalline phases (mineral species) to form. In spite of their thermodynamic instability, glasses can persist for millions of years. An alternate to glass …
Date:
July 20, 2004
Creator:
Bourcier, W. L. & Sickafus, K.
Object Type:
Book
System:
The UNT Digital Library
Iraq: U.S. Military Operations and Costs
Iraq’s chemical, biological, and nuclear weapons programs, together with Iraqi long-range missile development and support for al-Queda terrorism, were the primary justifications put forward for military action. On March 17, 2003, President Bush issued an ultimatum demanding that Saddam Hussein and his sons depart from Iraq within 48 hours. On March 19, offensive operations began with air strikes against Iraqi leadership positions. By April 15, after 27 days of operations, coalition forces were in relative control of all major Iraqi cities and Iraqi political and military leadership had disintegrated. On May 1, 2003, President Bush declared an end to major combat operations. There was no use of chemical or biological (CB)weapons, and no CB or nuclear weapons stockpiles or production facilities have been found.
Date:
November 20, 2004
Creator:
Bowman, Steven R.
Object Type:
Report
System:
The UNT Digital Library
Carriers of the astronomical 2175 ? extinction feature
The 2175 {angstrom} extinction feature is by far the strongest spectral signature of interstellar dust observed by astronomers. Forty years after its discovery the origin of the feature and the nature of the carrier remain controversial. The feature is enigmatic because although its central wavelength is almost invariant its bandwidth varies strongly from one sightline to another, suggesting multiple carriers or a single carrier with variable properties. Using a monochromated transmission electron microscope and valence electron energy-loss spectroscopy we have detected a 5.7 eV (2175 {angstrom}) feature in submicrometer-sized interstellar grains within interplanetary dust particles (IDPs) collected in the stratosphere. The carriers are organic carbon and amorphous silicates that are abundant and closely associated with one another both in IDPs and in the interstellar medium. Multiple carriers rather than a single carrier may explain the invariant central wavelength and variable bandwidth of the astronomical 2175 {angstrom} feature.
Date:
July 20, 2004
Creator:
Bradley, J.; Dai, Z.; Ernie, R.; Browning, N.; Graham, G.; Weber, P. et al.
Object Type:
Article
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 109, No. 16, Ed. 1 Wednesday, October 20, 2004
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 20, 2004
Creator:
Bridges, G. Frank & Bridges, Georgie
Object Type:
Newspaper
System:
The Portal to Texas History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 88, No. 112, Ed. 1 Tuesday, January 20, 2004
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 20, 2004
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 89, No. 139, Ed. 1 Friday, February 20, 2004
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 20, 2004
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 89, No. 184, Ed. 1 Tuesday, April 20, 2004
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 20, 2004
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 89, No. 210, Ed. 1 Thursday, May 20, 2004
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 20, 2004
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 89, No. 236, Ed. 1 Sunday, June 20, 2004
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 20, 2004
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 89, No. 262, Ed. 1 Tuesday, July 20, 2004
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 20, 2004
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 89, No. 290, Ed. 1 Friday, August 20, 2004
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 20, 2004
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 90, No. 6, Ed. 1 Monday, September 20, 2004
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 20, 2004
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 90, No. 32, Ed. 1 Wednesday, October 20, 2004
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 20, 2004
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History