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2,020 Matching Results
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0.7-eV GaInAs Junction for a GaInP/GaAs/GaInAs(1-eV)/GaInAs(0.7-eV) Four-Junction Solar Cell: Preprint
We discuss recent developments in III-V multijunction solar cells, focusing on adding a fourth junction to the Ga0.5In0.5P/GaAs/Ga0.75In0.25As inverted three-junction cell. This cell, grown inverted on GaAs so that the lattice-mismatched Ga0.75In0.25As third junction is the last one grown, has demonstrated 38% efficiency, and 40% is likely in the near future. To achieve still further gains, a lower-bandgap GaxIn1-xAs fourth junction could be added to the three-junction structure for a four-junction cell whose efficiency could exceed 45% under concentration. Here, we present the initial development of the GaxIn1-xAs fourth junction. Junctions of various bandgaps ranging from 0.88 to 0.73 eV were grown, in order to study the effect of the different amounts of lattice mismatch. At a bandgap of 0.88 eV, junctions were obtained with very encouraging {approx}80% quantum efficiency, 57% fill factor, and 0.36 eV open-circuit voltage. The device performance degrades with decreasing bandgap (i.e., increasing lattice mismatch). We model the four-junction device efficiency vs. fourth junction bandgap to show that an 0.7-eV fourth-junction bandgap, while optimal if it could be achieved in practice, is not necessary; an 0.9-eV bandgap would still permit significant gains in multijunction cell efficiency while being easier to achieve than the lower-bandgap junction.
Date:
May 1, 2006
Creator:
Friedman, D. J.; Geisz, J. F.; Norman, A. G.; Wanlass, M. W. & Kurtz, S. R.
Object Type:
Article
System:
The UNT Digital Library
100 Area and 300 Area Component of the RCBRA Fall 2005 Data Compilation
The purpose of this report is to provide a brief description of the sampling approaches, a description of the samples collected, and the results for the Fall 2005 sampling event. This report presents the methods and results of the work to support the 100 Area and 300 Area Component of the River Corridor Baseline Risk Assessment.
Date:
May 30, 2006
Creator:
Queen, J.M.
Object Type:
Report
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 35, No. 30, Ed. 1 Friday, May 5, 2006
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
May 5, 2006
Creator:
Waltman, Erin
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
2010 Census: Census Bureau Generally Follows Selected Leading Acquisition Planning Practices, but Continued Management Attention Is Needed to Help Ensure Success
A letter report issued by the Government Accountability Office with an abstract that begins "For the 2010 Census, the U.S. Census Bureau (Bureau) is making the most extensive use of contractors in its history to supply a number of mission-critical functions and technologies. Because of the critical role that contractors will play in the 2010 Census, GAO reviewed the Bureau's acquisition planning process. Specifically GAO's objectives were to (1) determine the status of the Bureau's major decennial contracts, and (2) evaluate the extent to which the Bureau is using selected leading practices to manage its acquisition planning for these contracts."
Date:
May 18, 2006
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
21st Century Locomotive Technology: Quarterly Technical Status Report 13 DOE/AL68284-TSR13
Upgrades and calibrations were performed on the single cylinder engine. Production of a baseline engine performance dataset has started using GE Evolution engine hardware, including the production unit pump fuel system. Long-term tests of battery cells energized at room temperature were performed. Hybrid energy storage capabilities were added to the fuel optimizer.
Date:
May 9, 2006
Creator:
Salasoo, Lembit & Topinka, Jennifer
Object Type:
Report
System:
The UNT Digital Library
[22nd Annual Summer Youth Arts Institute Performance Video]
Video footage from The Black Academy of Arts and Letters recorded during the 20th annual Summer Youth Arts Institute performance held on June 12, 2004. The theme of the year's program is remembering the past while celebrating the future with performers from ages ranging from elementary to high school students. Groups include bands, orchestras, dancers, handbell choirs and speakers. Various administrators speak throughout the performance as they reset the stage about the program and notable volunteers.
Date:
May 10, 2006
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
S. 2557, “Oil and Gas Industry Antitrust Act of 2006”: Brief Legal Analysis
This report analyzes ways to improve antitrust laws through S.557. These include, but are not limited to: mitigating regional shortages of oil petroleum and natural gas products, creating a federal task force to analyze information-sharing in the industry, and make U.S. antitrust laws applicable to the Organization of Petroleum Exporting Countries (OPEC).
Date:
May 12, 2006
Creator:
Rubin, Janice E.
Object Type:
Report
System:
The UNT Digital Library
[2nd Annual Weekend Festival of Black Dance, performance tape]
Video recording from The Black Academy of Arts and Letters recorded during their 2nd annual weekend festival of black dance held over the weekend of May 10-11, 2006. The footage shows the performance held on May 11th with Legends of West Africa dancers and drummers performing
Date:
May 11, 2006
Creator:
Boyd, Kenneth
Object Type:
Video
System:
The UNT Digital Library
[2nd Annual Weekend Festival of Black Dance, tape 1 of 2]
Video recording from The Black Academy of Arts and Letters recorded during their 2nd annual weekend festival of black dance held over the weekend of May 10-11, 2006. The footage shows the performance held on May 11th with Legends of West Africa dancers and drummers performing the first act. The tape ends with the beginning of the intermission.
Date:
May 11, 2006
Creator:
King, Curtis
Object Type:
Video
System:
The UNT Digital Library
[2nd Annual Weekend Festival of Black Dance, tape 2 of 2]
Video recording from The Black Academy of Arts and Letters recorded during their 2nd annual weekend festival of black dance held over the weekend of May 10-11, 2006. The footage shows the performance held on May 11th begins directly after the intermission with the second act of the Dallas Black Dance Theatre. The tape ends with brief post-performance audience interviews.
Date:
May 11, 2006
Creator:
Legends of West Africa; Dallas Black Dance Theatrre & King, Curtis
Object Type:
Video
System:
The UNT Digital Library
30th Actinide Separations Conference, PNNL-SA-50126
Program booklet for the 30th Actinide Separations Conference. Contains agenda and abstracts for 27 poster and 38 oral presentations to be made during the 3-day meeting, May 23-25, 2006.
Date:
May 25, 2006
Creator:
Delegard, Calvin H.
Object Type:
Article
System:
The UNT Digital Library
An Ab Initio Approach Towards Engineering Fischer-Tropsch Surface Chemistry
One of the greatest societal challenges over the next decade is the production of cheap, renewable energy for the 10 billion people that inhabit the earth. This will require the development of various different energy sources potentially including fuels derived from methane, coal, and biomass and alternatives sources such as solar, wind and nuclear energy. One approach will be to synthesize gasoline and other fuels from simpler hydrocarbons such as CO derived from methane or other U.S. based sources such as coal. Syngas (CO and H{sub 2}) can be readily converted into higher molecular weight hydrocarbons through Fischer-Tropsch synthesis. Fischer-Tropsch synthesis involves the initiation or activation of CO and H{sub 2} bonds, the subsequent propagation steps including hydrogenation and carbon-carbon coupling, followed by chain termination reactions. Commercially viable catalysts include supported Co and Co-alloys. Over the first two years of this project we have used ab initio methods to determine the adsorption energies for all reactants, intermediates, and products along with the overall reaction energies and their corresponding activation barriers over the Co(0001) surface. Over the third year of the project we developed and advanced an ab initio-based kinetic Monte Carlo simulation code to simulate Fischer Tropsch synthesis. This report …
Date:
May 7, 2006
Creator:
Neurock, Matthew & Walthall, David A.
Object Type:
Report
System:
The UNT Digital Library
Absolute Measurement of Electron Cloud Density in a Positively-Charged Particle Beam
Clouds of stray electrons are ubiquitous in particle accelerators and frequently limit the performance of storage rings. Earlier measurements of electron energy distribution and flux to the walls provided only a relative electron cloud density. We have measured electron accumulation using ions expelled by the beam. The ion energy distribution maps the depressed beam potential and gives the dynamic cloud density. Clearing electrode current reveals the static background cloud density, allowing the first absolute measurement of the time-dependent electron cloud density during the beam pulse.
Date:
May 18, 2006
Creator:
Covo, M K; Molvik, A W; Friedman, A; Vay, J; Seidl, P A; Logan, B G et al.
Object Type:
Article
System:
The UNT Digital Library
An AC dipole for the Tevatron - Initial tests
None
Date:
May 1, 2006
Creator:
Miyamoto, Ryoichi; Kopp, Sacha; Jansson, Andreas & Syphers, Mike
Object Type:
Article
System:
The UNT Digital Library
AC Transit Demos Three Prototype Fuel Cell Buses
Fact sheet describes the study being conducted on fuel cell buses at AC Transit.
Date:
May 1, 2006
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Acceptance and use of corporal punishment among parents of biologic and non-biologic children.
Objective: Differences between biologic and non-biologic parents' acceptance and use of ordinary corporal punishment and use of explaining/reasoning as a disciplinary tool are examined from a sociobiological theoretical perspective. Method: Cross tabulations are used on data from a national survey conducted by the Gallup Organization in 1995. Results: Contrary to predictions, differences between biologic and non-biologic parents' acceptance of ordinary corporal punishment and the use of explaining/reasoning are not statistically significant. In addition, biologic parents are found to use ordinary corporal punishment significantly more often than non-biologic parents. Conclusions: The sociobiological theoretical perspective likely underestimates the influence of culture and social structure on parent-child interactions.
Date:
May 2006
Creator:
Hall, Ellie Tiedeman
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Accuracy of Self-Reported Height, Weight, and Calculated BMI and Resulting FITNESSGRAM® Healthy Fitness Zone Classification
Access:
Use of this item is restricted to the UNT Community
The determination of adiposity in adolescents is often assessed with calculations of body mass indices (BMI). Researchers often obtain these measurements from self-reported (SR) values. The purpose of this study was to determine the accuracy of SR height, weight, and calculated BMI (from height and weight). SR and actual measured (ME) BMI values were compared with standards from the FITNESSGRAM® Healthy Fitness Zone (HFZ) classifications. SR height and calculated BMI were found to be accurate while SR weight was, on average, underreported by 4.77 lbs. Because of these errors in SR height and weight, accuracy of classification into the FITNESSGRAM® HFZ was compromised. Consequently, it is important that researchers ascertain actual values of height and weight when measuring adolescents rather than use those from self-reports.
Date:
May 2006
Creator:
Rowell, Chelsie Joyce
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Accurate Method for Forward and Reverse Bias Curve Fitting of TPV I-V Data
None
Date:
May 11, 2006
Creator:
Danielson, L. & Depoy, D.
Object Type:
Report
System:
The UNT Digital Library
Accurate phylogenetic classification of DNA fragments based onsequence composition
Metagenome studies have retrieved vast amounts of sequenceout of a variety of environments, leading to novel discoveries and greatinsights into the uncultured microbial world. Except for very simplecommunities, diversity makes sequence assembly and analysis a verychallenging problem. To understand the structure a 5 nd function ofmicrobial communities, a taxonomic characterization of the obtainedsequence fragments is highly desirable, yet currently limited mostly tothose sequences that contain phylogenetic marker genes. We show that forclades at the rank of domain down to genus, sequence composition allowsthe very accurate phylogenetic 10 characterization of genomic sequence.We developed a composition-based classifier, PhyloPythia, for de novophylogenetic sequence characterization and have trained it on adata setof 340 genomes. By extensive evaluation experiments we show that themethodis accurate across all taxonomic ranks considered, even forsequences that originate fromnovel organisms and are as short as 1kb.Application to two metagenome datasets 15 obtained from samples ofphosphorus-removing sludge showed that the method allows the accurateclassification at genus level of most sequence fragments from thedominant populations, while at the same time correctly characterizingeven larger parts of the samples at higher taxonomic levels.
Date:
May 1, 2006
Creator:
McHardy, Alice C.; Garcia Martin, Hector; Tsirigos, Aristotelis; Hugenholtz, Philip & Rigoutsos, Isidore
Object Type:
Article
System:
The UNT Digital Library
Action Without Meeting Motions
Document listing the three motions made during the WASP Board of Directors meeting held in Nashville, TN on March 25, 2006.
Date:
May 10, 2006
Creator:
unknown
Object Type:
Report
System:
The Portal to Texas History
Adhesion and Thin-Film Module Reliability
None
Date:
May 1, 2006
Creator:
McMahon, T. J. & Jorgensen, G. J.
Object Type:
Presentation
System:
The UNT Digital Library
Adhesion and Thin-Film Module Reliability: Preprint
Among the infrequently measured but essential properties for thin-film (T-F) module reliability are the interlayer adhesion and cohesion within a layer. These can be cell contact layers to glass, contact layers to the semiconductor, encapsulant to cell, glass, or backsheet, etc. We use an Instron mechanical testing unit to measure peel strengths at 90{sup o} or 180{sup o} and, in some cases, a scratch and tape pull test to evaluate inter-cell layer adhesion strengths. We present peel strength data for test specimens laminated from the three T-F technologies, before and after damp heat, and in one instance at elevated temperatures. On laminated T-F cell samples, failure can occur uniformly at any one of the many interfaces, or non-uniformly across the peel area at more than one interface. Some peel strengths are << 1 N/mm. This is far below the normal Instron mechanical testing unit Instron mechanical testing unit; glass interface values of >10 N/mm. We measure a wide range of adhesion strengths and suggest that adhesion measured under higher temperature and relative humidity conditions is more relevant for module reliability.
Date:
May 1, 2006
Creator:
McMahon, T. J. & Jorgensen, G. J.
Object Type:
Article
System:
The UNT Digital Library
The Adoption and Use of Electronic Information Resources by a Non-Traditional User Group: Automotive Service Technicians.
The growing complexity of machines has led to a concomitant increase in the amount and complexity of the information needed by those charged with servicing them. This, in turn, has led to a need for more robust methods for storing and distributing information and for a workforce more sophisticated in its use of information resources. As a result, the service trades have "professionalized," adopting more rigorous academic standards and developing ongoing certification programs. The current paper deals with the acceptance of advanced electronic information technology by skilled service personnel, specifically, automotive service technicians. The theoretical basis of the study is Davis' technology acceptance model. The purpose of the study is to determine the effects of three external factors on the operation of the model: age, work experience, and education/certification level. The research design is in two parts, beginning with an onsite observation and interviews to establish the environment. During the second part of the research process a survey was administered to a sample of automotive service technicians. Results indicated significant inverse relationships between age and acceptance and between experience and acceptance. A significant positive relationship was shown between education, particularly certification, and acceptance.
Date:
May 2006
Creator:
Almquist, Arne J.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Advanced CIDI Emission Control System Development
Ford Motor Company, with ExxonMobil and FEV, participated in the Department of Energy's (DOE) Ultra-Clean Transportation Fuels Program with the goal to develop an innovative emission control system for light-duty diesel vehicles. The focus on diesel engine emissions was a direct result of the improved volumetric fuel economy (up to 50%) and lower CO2 emissions (up to 25%) over comparable gasoline engines shown in Europe. Selective Catalytic Reduction (SCR) with aqueous urea as the NOx reductant and a Catalyzed Diesel Particulate Filter (CDPF) were chosen as the primary emission control system components. The program expected to demonstrate more than 90% durable reduction in particulate matter (PM) and NOx emissions on a light-duty truck application, based on the FTP-75 drive cycle. Very low sulfur diesel fuel (<15 ppm-wt) enabled lower PM emissions, reduced fuel economy penalty due to the emission control system and improved long-term system durability. Significant progress was made toward a durable system to meet Tier 2 Bin 5 emission standards on a 6000 lbs light-duty truck. A 40% reduction in engine-out NOx emissions was achieved with a mid-size prototype diesel engine through engine recalibration and increased exhaust gas recirculation. Use of a rapid warm-up strategy and urea SCR …
Date:
May 31, 2006
Creator:
Lambert, Christine
Object Type:
Report
System:
The UNT Digital Library