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1,990 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
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
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
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 Wind Turbine Program Next Generation Turbine Development Project: June 17, 1997--April 30, 2005
This document reports the technical results of the Next Generation Turbine Development Project conducted by GE Wind Energy LLC. This project is jointly funded by GE and the U.S. Department of Energy's National Renewable Energy Laboratory.The goal of this project is for DOE to assist the U.S. wind industry in exploring new concepts and applications of cutting-edge technology in pursuit of the specific objective of developing a wind turbine that can generate electricity at a levelized cost of energy of $0.025/kWh at sites with an average wind speed of 15 mph (at 10 m height).
Date:
May 1, 2006
Creator:
GE Wind Energy, LLC
Object Type:
Report
System:
The UNT Digital Library
Afghanistan: Elections, Constitution, and Government
In 2004 and 2005, Afghanistan adopted a permanent constitution and elected a president and a parliament. The parliament is emerging as a significant force in Afghan politics, as shown in debate over a new cabinet proposed in March 2006. However, insurgent violence continues to threaten Afghan stability. See CRS Report RL30588, Afghanistan: Post-War Governance, Security, and U.S. Policy, by Kenneth Katzman.
Date:
May 1, 2006
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
AGC-1 Irradiation Experiment Test Plan
The Advanced Graphite Capsule (AGC) irradiation test program supports the acquisition of irradiated graphite performance data to assist in the selection of the technology to be used for the VHTR. Six irradiations are planned to investigate compressive creep in graphite subjected to a neutron field and obtain irradiated mechanical properties of vibrationally molded, extruded, and iso-molded graphites for comparison. The experiments will be conducted at three temperatures: 600, 900, and 1200°C. At each temperature, two different capsules will be irradiated to different fluence levels, the first from 0.5 to 4 dpa and the second from 4 to 7 dpa. AGC-1 is the first of the six capsules designed for ATR and will focus on the prismatic fluence range.
Date:
May 1, 2006
Creator:
Bratton, R. L.
Object Type:
Report
System:
The UNT Digital Library
The Age, Volume 28, Number 5, May 2006
Monthly publication containing information related to Chambers County, Texas, including current events of the Chambers County Historical Commission, the Wallisville Heritage Park, and the Chambers County historical and genealogical societies; reprinted newspaper articles about county events and citizens; and historical news and records.
Date:
May 2006
Creator:
Wallisville Heritage Park (Organization)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
AGS-less RIA with FFAG Accelerators
N/A
Date:
May 1, 2006
Creator:
Ruggiero, Alessandro G.
Object Type:
Report
System:
The UNT Digital Library
Air Tightness of US Homes: Model Development
Air tightness is an important property of building envelopes. It is a key factor in determining infiltration and related wall-performance properties such as indoor air quality, maintainability and moisture balance. Air leakage in U.S. houses consumes roughly 1/3 of the HVAC energy but provides most of the ventilation used to control IAQ. The Lawrence Berkeley National Laboratory has been gathering residential air leakage data from many sources and now has a database of more than 100,000 raw measurements. This paper uses that database to develop a model for estimating air leakage as a function of climate, building age, floor area, building height, floor type, energy-efficiency and low-income designations. The model developed can be used to estimate the leakage distribution of populations of houses.
Date:
May 1, 2006
Creator:
Sherman, Max H.
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 107, No. 332, Ed. 1 Monday, May 1, 2006
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 1, 2006
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
AMANDA Observations Constrain the Ultrahigh Energy Neutrino Flux
A number of experimental techniques are currently being deployed in an effort to make the first detection of ultra-high energy cosmic neutrinos. To accomplish this goal, techniques using radio and acoustic detectors are being developed, which are optimally designed for studying neutrinos with energies in the PeV-EeV range and above. Data from the AMANDA experiment, in contrast, has been used to place limits on the cosmic neutrino flux at less extreme energies (up to {approx}10 PeV). In this letter, we show that by adopting a different analysis strategy, optimized for much higher energy neutrinos, the same AMANDA data can be used to place a limit competitive with radio techniques at EeV energies. We also discuss the sensitivity of the IceCube experiment, in various stages of deployment, to ultra-high energy neutrinos.
Date:
May 1, 2006
Creator:
Halzen, Francis & Hooper, Dan
Object Type:
Article
System:
The UNT Digital Library
Americans With Disabilities: 2002
This report presents information on the number and characteristics of individuals with disabilities and is based on data collected in wave 5 of the 2001 Panel of the Survey of Income and Program Participation (SIPP).
Date:
May 2006
Creator:
Steinmetz, Erika
Object Type:
Text
System:
The UNT Digital Library
Amorphous Transparent Conducting Oxides (TCOs) Deposited at T 100<= ..deg.. C
The summary of this report is that amorphous InZnO (a-IZO) is a very versatile TCO with: (1) low process temperatures ({approx} 100 C); (2) easy to make by sputtering; (3) excellent optical and electronic properties; (4) very smooth etchable films; and (5) remarkable thermal processing stability.
Date:
May 1, 2006
Creator:
Perkins, J.; van Hest, M.; Teplin, C.; Alleman, J.; Dabney, M.; Gedvilas, L. et al.
Object Type:
Presentation
System:
The UNT Digital Library
Analog signal pre-processing for the Fermilab Main Injector BPM upgrade
An analog signal pre-processing scheme was developed, in the framework of the Fermilab Main Injector Beam Position Monitor (BPM) Upgrade, to interface BPM pickup signals to the new digital receiver based read-out system. A key component is the 8-channel electronics module, which uses separate frequency selective gain stages to acquire 53 MHz bunched proton, and 2.5 MHz anti-proton signals. Related hardware includes a filter and combiner box to sum pickup electrode signals in the tunnel. A controller module allows local/remote control of gain settings and activation of gain stages, and supplies test signals. Theory of operation, system overview, and some design details are presented, as well as first beam measurements of the prototype hardware.
Date:
May 1, 2006
Creator:
Saewert, A. L.; Rapisarda, S. M. & Wendt, M.
Object Type:
Article
System:
The UNT Digital Library
Analyses of Wind Energy Impact on WFEC System Operations: Preprint
Article for the Journal of Solar Energy Engineering which analyzes system and wind energy data recorded by WFEC and evaluates the effects of wind energy on system operations.
Date:
May 1, 2006
Creator:
Wan, Y. & Liao, J. R.
Object Type:
Article
System:
The UNT Digital Library
Analysis of emittance growth in the Fermilab Booster
Multi-particle simulations are performed to study emittance growth in the Fermilab Booster. Analysis shows that the source of vertical emittance growth comes mostly from random errors in skew quadrupoles in the presence of a strong transverse space-charge force. [1] Random errors in dipole rolls and the Montague resonance do contribute but to lesser extent. The effect of random errors in the quadrupoles is small because the betatron envelope tunes are reasonably far away from the half-integer stopband.
Date:
May 1, 2006
Creator:
Ng, K. Y.; Huang, X. & Lee, S. Y.
Object Type:
Article
System:
The UNT Digital Library
Analysis of enhanced tan(beta) corrections in MFV GUT scenarios
Long-range forces between macroscopic objects are mediated by light particles that interact with the electrons or nucleons, and include spin-dependent static components as well as spin- and velocity-dependent components. We parametrize the long-range potential between two fermions assuming rotational invariance, and find 16 different components. Applying this result to electrically neutral objects, we show that the macroscopic potential depends on 72 measurable parameters. We then derive the potential induced by the exchange of a new gauge boson or spinless particle, and compare the limits set by measurements of macroscopic forces to the astrophysical limits on the couplings of these particles.
Date:
May 1, 2006
Creator:
Lunghi, Enrico; Porod, Werner & Vives, Oscar
Object Type:
Article
System:
The UNT Digital Library
Analysis of salt and casing fracture mechanisms during cavern integrity testing for SPR salt caverns.
None
Date:
May 1, 2006
Creator:
Ehgartner, Brian L. & Sobolik, Steven Ronald
Object Type:
Report
System:
The UNT Digital Library
An Analytical Study of Robert Muczynski's Second Piano Trio
The purpose of this study is to provide scholastic research on Robert Muczynski's Second Piano Trio (1975) by presenting his biographical background, discussing influences and his musical style, and analyzing the work. Robert Muczynski (b.1929), a composer-pianist of Polish descent, studied with Alexander Tcherepnin (1899-1977). From traditional forms and techniques, he fashioned his own unique and innovative compositional style. The second piano trio, in particular, was deeper and more complex in its conception and affect than previous compositions. The first movement Andante molto opening leads to an allegro section, and the somber second movement builds to a heavy climax. The third movement is highly rhythmic and dramatically driven. Chapter I outlines the purpose of the study and the composer's biography. Chapter II describes Muczynski's compositional influences and the evolution of his musical language. Emphasis in this respect will be placed on the pedagogical role of Alexander Therepnin, as well as the important connections between Prokofiev, Tcherepnin and Muczynski. An exploration of other elements that have informed Muczynski's style is offered. Chapter III details the circumstances, general characteristics, and compositional technique of the Second Piano Trio. Detailed analysis of all three movements will be provided, with particular attention paid to aspects …
Date:
May 2006
Creator:
Oh, Eun Jun
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library