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1,756
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765
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138
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107
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100
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72
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34
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26
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21
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The Black Academy of Arts and Letters Records
1,626
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Texas Digital Newspaper Program
349
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135
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76
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Development of warrants for installation of dual right-turn lanes at signalized intersections
"Right-turn lanes provide space for the deceleration and storage of right-turn vehicle, and separate turning vehicles from through movements. Dual right-turn lanes are increasingly used at urban intersections primarily for two reason: (1) to accommodate high right-turn demands and avoid turn-pocket overflows, and/or (2) to prevent right-turn vehicles that exit from a nearby upstream freeway off-ramp (on the left of the roadway) from abruptly changing too many lanes toward the right-turn lane at intersection."
Date:
April 2012
Creator:
Chen, Xiaoming & Li, Da
Object Type:
Report
System:
The Portal to Texas History
Development of ZnTe:Cu Contacts for CdTe Solar Cells: Cooperative Research and Development Final Report, CRADA Number CRD-08-320
The main focus of the work at NREL was on the development of Cu-doped ZnTe contacts to CdTe solar cells in the substrate configuration. The work performed under the CRADA utilized the substrate device structure used at NREL previously. All fabrication was performed at NREL. We worked on the development of Cu-doped ZnTe as well as variety of other contacts such as Sb-doped ZnTe, CuxTe, and MoSe2. We were able to optimize the contacts to improve device parameters. The improvement was obtained primarily through increasing the open-circuit voltage, to values as high as 760 mV, leading to device efficiencies of 7%.
Date:
April 1, 2012
Creator:
Dhere, R.
Object Type:
Report
System:
The UNT Digital Library
Diffraction Results from CDF
We present final results by the CDF II collaboration on diffractive W and Z production, report on the status of ongoing analyses on diffractive dijet production and on rapidity gaps between jets, and briefly summarize results obtained on exclusive production pointing to their relevance to calibrating theoretical models used to predict exclusive Higgs-boson production at the LHC.
Date:
April 1, 2012
Creator:
Goulianos, Konstantin
Object Type:
Article
System:
The UNT Digital Library
The Digital Squeeze: Libraries at the Crossroads: the Library Resource Guide Benchmark Study on 2012 Library Spending Plans
Access:
Use of this item is restricted to the UNT Community
The second annual benchmark study of library spending plans from Library Resource Guide explores the wide range of spending and priorities decision-making taking place in 2012 budgets for public, academic and special libraries. Includes year-to-year comparative data. Learn where peer institutions are focusing their scarce investments, based on a study of over 700 participating North American institutions.
Date:
April 2012
Creator:
McKendrick, Joseph
Object Type:
Book
System:
The UNT Digital Library
Disciplinary Rules and Procedures for Offenders
Document detailing the disciplinary rules and procedures for offenders in the custody of the Texas Department of Criminal Justice, Correctional Institutions Division.
Date:
April 2012
Creator:
Texas. Department of Criminal Justice.
Object Type:
Text
System:
The Portal to Texas History
Distributed Wind Case Study: Cross Island Farms, Wellesley Island, New York (Fact Sheet)
Installing a small wind turbine can sometimes be difficult due to economics, zoning issues, public perception, and other barriers. Persistence and innovation, however, can result in a successful installation. Dani Baker and David Belding own Cross Island Farms, a 102-acre certified organic farm on Wellesley Island in northern New York. In 2009, they took their interest in renewable energy to the next level by researching the logistics of a small wind installation on their land to make their farm even more sustainable. Their renewable energy system consists of one 10-kilowatt Bergey Excel wind turbine, a solar array, and a propane-powered generator. This case study describes funding for the project and the installation process.
Date:
April 1, 2012
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Diversity Partnership Success: Together We Will Achieve More
Advertisement and registration form for the HUB Procurement Connection Seminar and Expo in Austin, Texas on June 18, 2012.
Date:
April 2012
Creator:
Texas. Statewide Historically Underutilized Business Program.
Object Type:
Text
System:
The Portal to Texas History
Doctoral Recital: 2012-04-01 - Katie Jo Ross, soprano
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
April 1, 2012
Creator:
Ross, Katie Jo
Object Type:
Sound
System:
The UNT Digital Library
Doctoral Recital: 2012-04-01 - Rachel Madden, trumpet
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
April 1, 2012
Creator:
Madden, Rachel
Object Type:
Sound
System:
The UNT Digital Library
DOE-Imaging grant FG02-06ER15829, entitled "Developing Laser-Induced Re-Collision Electron Self-Diffraction" Brief summary of accomplishments
Our principal goal was the experimental demonstration of Laser-Induced Electron Diffraction (LIED). Key steps along the development of this experimental technique have been accomplished and reported in the publications listed in this brief report. We started with measuring 3D electron momenta spectra in aligned nitrogen and oxygen molecules. Chakra Maharjan (Ph.D. student of Lew Cocke) was a lead researcher on this project. Although Chakra succeeded in obtaining those spectra, we were scooped by the publication of identical results in Science by the NRC Ottawa group. Our results were never published as a refereed article, but became a part of Chakra's Ph.D. dissertation. That Science paper was the first experimental demonstration of Laser-Induced Electron Diffraction (LIED). Chakra also worked on wavelength dependence of 3D ATI spectra of atoms and molecules using tunable OPA pulses. Another Ph.D. student, Maia Magrakvelidze (her GRA was funded by the grant), started working on COLTRIMS experiments using OPA pulses (1800 nm wavelength). After some initial experiments it became apparent that COLTRIMS did not yield sufficient count rates of electrons in the high-energy part of the spectrum to see diffraction signatures with acceptable statistics (unfavorable scaling of the electron yield with laser wavelength was partly to blame). …
Date:
2012-04~
Creator:
Litvinyuk, Igor V. & Ben-Itzhak, Itzik
Object Type:
Report
System:
The UNT Digital Library
DOE-NE Light Water Reactor Sustainability Program and EPRI Long-Term Operations Program – Joint Research and Development Plan
Nuclear power has contributed almost 20% of the total amount of electricity generated in the United States over the past two decades. High capacity factors and low operating costs make nuclear power plants (NPPs) some of the most economical power generators available. Further, nuclear power remains the single largest contributor (nearly 70%) of non-greenhouse gas-emitting electric power generation in the United States. Even when major refurbishments are performed to extend operating life, these plants continue to represent cost-effective, low-carbon assets to the nation's electrical generation capability.
Date:
April 1, 2012
Creator:
Williams, Don
Object Type:
Report
System:
The UNT Digital Library
Does your child have special needs?: Help for Children with Special Needs from the Texas Birth Defects Registry
This pamphlet provides information about the programs and benefits available to children with special health care needs from the Texas Department of State Health Services, Texas Birth Defects Registry.
Date:
April 2012
Creator:
Texas. Department of State Health Services. Texas Birth Defects Registry.
Object Type:
Pamphlet
System:
The Portal to Texas History
Dynamometer Testing of a NW2200 Drivetrain: Cooperative Research and Development Final Report, CRADA Number CRD-10-394
Northern Power Systems specializes in direct drive wind turbine designs. CRADA CRD-10-394 involved testing the NW2200 wind turbine power train. Power train testing is important because it allows validation of the generator design and some control algorithms prior to installation on a tower, where this data would be more difficult and time consuming to collect. In an effort to keep the commercial product schedule on time, Northern Power requested testing support from the National Renewable Energy Laboratory for this testing. The test program was performed using NREL's 2.5 MW dynamometer test bed at the National Wind Technology Center near Boulder, CO.
Date:
April 1, 2012
Creator:
Wallen, R.
Object Type:
Report
System:
The UNT Digital Library
EBAC-DCC Analysis of World Data of pi N, gamma N, and N(e,e') Reactions
The development, results, and prospect of the Dynamical Coupled-Channels analysis at Excited Baryon Analysis Center (EBAC-DCC) are reported. In this contribution, we report on the development, results, and prospect of EBAC. The EBAC project has three components, as illustrated in Fig. 1. The first task is to perform a dynamical coupled-channels analysis of the world data of {pi}N, {gamma}*N {yields} {pi}N, {eta}N, {pi}{pi}N, K{Lambda}, K{Sigma}, {omega}N, {hor_ellipsis} to determine the meson-baryon partial-wave amplitudes. The second step is to develop a procedure to extract the N* parameters from the determined partial-wave amplitudes. The third step is to investigate the interpretations of the extracted N* properties in terms of the available hadron models and Lattice QCD.
Date:
April 1, 2012
Creator:
Hiroyuki Kamano,Tsung-Shung Lee
Object Type:
Article
System:
The UNT Digital Library
EC Transmission Line Risk Identification and Analysis
The purpose of this document is to assist in evaluating and planning for the cost, schedule, and technical project risks associated with the delivery and operation of the EC (Electron cyclotron) transmission line system. In general, the major risks that are anticipated to be encountered during the project delivery phase associated with the implementation of the Procurement Arrangement for the EC transmission line system are associated with: (1) Undefined or changing requirements (e.g., functional or regulatory requirements) (2) Underperformance of prototype, first unit, or production components during testing (3) Unavailability of qualified vendors for critical components Technical risks associated with the design and operation of the system are also identified.
Date:
April 1, 2012
Creator:
Bigelow, Tim S.
Object Type:
Report
System:
The UNT Digital Library
The ECHO, Volume 84, Number 3, April 2012
Monthly newspaper produced for inmates in the Texas criminal justice system containing news stories, policy updates, opinion pieces, creative works, and other information.
Date:
April 2012
Creator:
Texas. Department of Criminal Justice.
Object Type:
Newspaper
System:
The Portal to Texas History
EDS V25 containment vessel explosive qualification test report.
The V25 containment vessel was procured by the Project Manager, Non-Stockpile Chemical Materiel (PMNSCM) as a replacement vessel for use on the P2 Explosive Destruction Systems. It is the first EDS vessel to be fabricated under Code Case 2564 of the ASME Boiler and Pressure Vessel Code, which provides rules for the design of impulsively loaded vessels. The explosive rating for the vessel based on the Code Case is nine (9) pounds TNT-equivalent for up to 637 detonations. This limit is an increase from the 4.8 pounds TNT-equivalency rating for previous vessels. This report describes the explosive qualification tests that were performed in the vessel as part of the process for qualifying the vessel for explosive use. The tests consisted of a 11.25 pound TNT equivalent bare charge detonation followed by a 9 pound TNT equivalent detonation.
Date:
April 1, 2012
Creator:
Rudolphi, John Joseph
Object Type:
Report
System:
The UNT Digital Library
Efficient speaker verification using Gaussian mixture model component clustering.
In speaker verification (SV) systems that employ a support vector machine (SVM) classifier to make decisions on a supervector derived from Gaussian mixture model (GMM) component mean vectors, a significant portion of the computational load is involved in the calculation of the a posteriori probability of the feature vectors of the speaker under test with respect to the individual component densities of the universal background model (UBM). Further, the calculation of the sufficient statistics for the weight, mean, and covariance parameters derived from these same feature vectors also contribute a substantial amount of processing load to the SV system. In this paper, we propose a method that utilizes clusters of GMM-UBM mixture component densities in order to reduce the computational load required. In the adaptation step we score the feature vectors against the clusters and calculate the a posteriori probabilities and update the statistics exclusively for mixture components belonging to appropriate clusters. Each cluster is a grouping of multivariate normal distributions and is modeled by a single multivariate distribution. As such, the set of multivariate normal distributions representing the different clusters also form a GMM. This GMM is referred to as a hash GMM which can be considered to a …
Date:
April 1, 2012
Creator:
De Leon, Phillip L. (New Mexico State University, Las Cruces, NM) & McClanahan, Richard D.
Object Type:
Report
System:
The UNT Digital Library
Electrical Generation for More-Electric Aircraft Using Solid Oxide Fuel Cells
This report examines the potential for Solid-Oxide Fuel Cells (SOFC) to provide electrical generation on-board commercial aircraft. Unlike a turbine-based auxiliary power unit (APU) a solid oxide fuel cell power unit (SOFCPU) would be more efficient than using the main engine generators to generate electricity and would operate continuously during flight. The focus of this study is on more-electric aircraft which minimize bleed air extraction from the engines and instead use electrical power obtained from generators driven by the main engines to satisfy all major loads. The increased electrical generation increases the potential fuel savings obtainable through more efficient electrical generation using a SOFCPU. However, the weight added to the aircraft by the SOFCPU impacts the main engine fuel consumption which reduces the potential fuel savings. To investigate these relationships the Boeing 7878 was used as a case study. The potential performance of the SOFCPU was determined by coupling flowsheet modeling using ChemCAD software with a stack performance algorithm. For a given stack operating condition (cell voltage, anode utilization, stack pressure, target cell exit temperature), ChemCAD software was used to determine the cathode air rate to provide stack thermal balance, the heat exchanger duties, the gross power output for a …
Date:
April 1, 2012
Creator:
Whyatt, Greg A. & Chick, Lawrence A.
Object Type:
Report
System:
The UNT Digital Library
Electromagnetic polarizabilities: Lattice QCD in background fields
Chiral perturbation theory makes definitive predictions for the extrinsic behavior of hadrons in external electric and magnetic fields. Near the chiral limit, the electric and magnetic polarizabilities of pions, kaons, and nucleons are determined in terms of a few well-known parameters. In this limit, hadrons become quantum mechanically diffuse as polarizabilities scale with the inverse square-root of the quark mass. In some cases, however, such predictions from chiral perturbation theory have not compared well with experimental data. Ultimately we must turn to first principles numerical simulations of QCD to determine properties of hadrons, and confront the predictions of chiral perturbation theory. To address the electromagnetic polarizabilities, we utilize the background field technique. Restricting our attention to calculations in background electric fields, we demonstrate new techniques to determine electric polarizabilities and baryon magnetic moments for both charged and neutral states. As we can study the quark mass dependence of observables with lattice QCD, the lattice will provide a crucial test of our understanding of low-energy QCD, which will be timely in light of ongoing experiments, such as at COMPASS and HI gamma S.
Date:
April 1, 2012
Creator:
W. Detmold, B.C. Tiburzi, A. Walker-Loud
Object Type:
Article
System:
The UNT Digital Library
Electroproduction of $Λ$(1405)
The electroproduction of K{sup +} {Lambda}(1405) was studied by analyzing the E1F data set collected in Hall B at Jefferson Lab. The analysis utilized the decay channel {Sigma}{sup +} {pi}{sup -} of the {Lambda}(1405) and p{pi}{sup 0} of the {Sigma}{sup +}. Simulations of background, {Lambda}(1405) and {Lambda}(1520) production according to PDG values were performed by using standard CLAS analysis tools adapted for the E1F run. Fits of the acceptance-corrected simulations were made to the acceptance-corrected data to determine contributions from signal and background processes. The line shape of {Lambda}(1405) varies with the four momentum transfer, Q{sup 2}, and does not match the line shape based on PDG resonance parameters. It corresponds approximately to predictions of a recent two-pole meson-baryon picture of this state.
Date:
April 1, 2012
Creator:
Haiyun Lu, Reinhard Schumacher, Brian Raue, Marianna Gabrielyan
Object Type:
Article
System:
The UNT Digital Library
Employment After Retirement
This document contains information for of Teacher Retirement System of Texas members who are not yet retired, already retired, and disability retired.
Date:
April 2012
Creator:
Teacher Retirement System of Texas
Object Type:
Book
System:
The Portal to Texas History
Energy Implications of Retrofitting Retail Sector Rooftop Units with Stepped-Speed and Variable-Speed Functionality
Commercial retailers understand that retrofitting constant-speed RTU fan motors with stepped- or variable-speed alternatives could save significant energy in most U.S. climate zones. However, they lack supporting data, both real-world and simulation based, on the cost effectiveness and climate zone-specific energy savings associated with this measure. Thus, building managers and engineers have been unable to present a compelling business case for fan motor upgrades to upper management. This study uses whole-building energy simulation to estimate the energy impact of this type of measure so retailers can determine its economic feasibility.
Date:
April 1, 2012
Creator:
Studer, D.; Romero, R.; Herrmann, L. & Benne, K.
Object Type:
Report
System:
The UNT Digital Library
The Ennis Daily News (Ennis, Tex.), Ed. 1 Sunday, April 1, 2012
Daily newspaper from Ennis, Texas that includes local, state and national news along with advertising.
Date:
April 1, 2012
Creator:
Todaro, Nick
Object Type:
Newspaper
System:
The Portal to Texas History