Partner
UNT Libraries Government Documents Department
2,482
Oklahoma Historical Society
43
UNT Libraries
43
UNT Libraries Special Collections
43
Sterling Municipal Library
11
National Museum of the Pacific War/Admiral Nimitz Foundation
10
Oklahoma State Firefighters Museum
10
Sweetwater/Nolan County City-County Library
9
Carl Albert Congressional Research and Studies Center
6
Livingston Municipal Library
5
50 More
Collection
Office of Scientific & Technical Information Technical Reports
2,397
Texas Digital Newspaper Program
143
Oklahoma Digital Newspaper Program
61
Congressional Research Service Reports
55
Tocker Foundation Grant
47
The Greensheet
31
LGBT Collections
30
Texas Stonewall Democratic Caucus Papers (The Dallas Way)
26
Government Accountability Office Reports
13
The Baytown Sun
11
91 More
Degree Department
Degree Discipline
Degree Level
Country
States
Decade
Year
Month
Day
Language
2,759 Matching Results
Results open in a new window/tab.
Assess the Efficacy of an Aerial Distant Observer Tool Capable of Rapid Analysis of Large Sections of Collector Fields, FY 2008 CSP Milestone Report, September 2008
We assessed the feasibility of developing an aerial Distant Observer optical characterization tool for collector fields in concentrating solar power plants.
Date:
February 1, 2009
Creator:
Jorgensen, G.; Burkholder, F.; Gray, A. & Wendelin, T.
Object Type:
Report
System:
The UNT Digital Library
Searches for new physics in the tt-bar events at CDF
The authors review the latest results on searches for physics beyond the Standard Model in the top quark sector at CDF Run II in a data sample with integrated luminosity up to 2.8 fb{sup -1}. Since its discovery, the top quark has appeared to be a very special object. It is distinguished by its large mass ({approx} 170 GeV) close to the scale of electroweak symmetry breaking (EWSB), and a Yukawa coupling surprisingly close to one (0.98). Is the top quark mass generated by the Higgs mechanism as the Standard Model (SM) predicts, or does it play a more fundamental role in the EWSB? How would physics beyond the standard model (SM) affect top quark properties? Searches for new physics (NP) should provide answers to the many open questions left by the SM. In these proceedings they present the latest CDF results on the searches for exotic decay modes of the top quark, as well as the production and decay of new particles into final states with a top quark pair. The analyses of the Run II data are performed with approximately 30 times the statistics of the Run I top quark discovery.
Date:
January 1, 2009
Creator:
Loginov, Andrey & U., /Yale
Object Type:
Article
System:
The UNT Digital Library
Chromaticity tracking with a phase modulation/demodulation technique in the Tevatron
The Tevatron chromaticity tracker (CT) has been successfully commissioned and is now operational. The basic idea behind the CT is that when the phase of the Tevatron RF is slowly modulated, the beam momentum is also modulated. This momentum modulation is coupled transversely via chromaticity to manifest as a phase modulation on the betatron tune. And so by phase demodulating the betatron tune, the chromaticity can be recovered. However, for the phase demodulation to be successful, it is critical that the betatron tune be a coherent signal that can be easily picked up by a phase detector. This is easily done because the Tevatron has a phase locked loop based tune tracker which coherently excites the beam at the betatron tune.
Date:
January 1, 2009
Creator:
Tan, C.Y.
Object Type:
Article
System:
The UNT Digital Library
Gearbox Modeling and Load Simulation of a Baseline 750-kW Wind Turbine Using State-of-the-Art Simulation Codes
This report discusses the causes for premature wind turbine gearbox failure and determining a method for revealing the missing loading conditions relevant to the gearbox design process.
Date:
February 1, 2009
Creator:
Oyague, F.
Object Type:
Report
System:
The UNT Digital Library
Analysis of the Reuse of Uranium Recovered from the Reprocessing of Commercial LWR Spent Fuel
This report provides an analysis of the factors involved in the reuse of uranium recovered from commercial light-water-reactor (LWR) spent fuels (1) by reenrichment and recycling as fuel to LWRs and/or (2) by recycling directly as fuel to heavy-water-reactors (HWRs), such as the CANDU (registered trade name for the Canadian Deuterium Uranium Reactor). Reuse is an attractive alternative to the current Advanced Fuel Cycle Initiative (AFCI) Global Nuclear Energy Partnership (GNEP) baseline plan, which stores the reprocessed uranium (RU) for an uncertain future or attempts to dispose of it as 'greater-than-Class C' waste. Considering that the open fuel cycle currently deployed in the United States already creates a huge excess quantity of depleted uranium, the closed fuel cycle should enable the recycle of the major components of spent fuel, such as the uranium and the hazardous, long-lived transuranic (TRU) actinides, as well as the managed disposal of fission product wastes. Compared with the GNEP baseline scenario, the reuse of RU in the uranium fuel cycle has a number of potential advantages: (1) avoidance of purchase costs of 11-20% of the natural uranium feed; (2) avoidance of disposal costs for a large majority of the volume of spent fuel that is …
Date:
February 1, 2009
Creator:
DelCul, Guillermo D; Trowbridge, Lee D; Renier, John-Paul; Ellis, Ronald James; Williams, Kent Alan; Spencer, Barry B et al.
Object Type:
Report
System:
The UNT Digital Library
Measurement of B_s Oscillations and CP Violation Results from D0
We present a measurement of the B{sub s}{sup 0} - B{sub s}{sup 0} oscillation frequency, {Delta}m{sub s}, using a combination of semi-leptonic and hadronic B{sub s} decay candidates selected from data collected by the D0 Experiment at the Fermilab Tevatron. We also present several results on CP violation, including an improved measurement of the B{sub s} CP-violating phase from a flavor-tagged analysis of B{sub s}{sup 0} {yields} J/{psi} + {phi} decays.
Date:
January 1, 2009
Creator:
Ellison, John & /UC, Riverside
Object Type:
Article
System:
The UNT Digital Library
Comparative Analysis of Natural Convection Flows Simulated by both the Conservation and Incompressible Forms of the Navier-Stokes Equations in a Differentially-Heated Square Cavity
This report illustrates a comparative study to analyze the physical differences between numerical simulations obtained with both the conservation and incompressible forms of the Navier-Stokes equations for natural convection flows in simple geometries. The purpose of this study is to quantify how the incompressible flow assumption (which is based upon constant density advection, divergence-free flow, and the Boussinesq gravitational body force approximation) differs from the conservation form (which only assumes that the fluid is a continuum) when solving flows driven by gravity acting upon density variations resulting from local temperature gradients. Driving this study is the common use of the incompressible flow assumption in fluid flow simulations for nuclear power applications in natural convection flows subjected to a high heat flux (large temperature differences). A series of simulations were conducted on two-dimensional, differentially-heated rectangular geometries and modeled with both hydrodynamic formulations. From these simulations, the selected characterization parameters of maximum Nusselt number, average Nusselt number, and normalized pressure reduction were calculated. Comparisons of these parameters were made with available benchmark solutions for air with the ideal gas assumption at both low and high heat fluxes. Additionally, we generated body force, velocity, and divergence of velocity distributions to provide a basis …
Date:
January 1, 2009
Creator:
Martineau, Richard C.; Berry, Ray A.; Esteve, Aurélia; Hamman, Kurt D.; Knoll, Dana A.; Park, Ryosuke et al.
Object Type:
Report
System:
The UNT Digital Library
Targeted and comprehensive space-environment sensors: description and recommendations
We discuss the roles of the two classes of space-environment sensors on operational space systems: (1) Targeted sensors capable of measuring the environment and effects at a level sufficient for providing situational awareness for the host spacecraft and (2) Comprehensive sensors capable of providing detailed environment measurements that can be mapped to a broad region of near-Earth space, providing global situational awareness and quantitative characterization of the environment. Our purpose is to show the usefulness of a heterogeneous architecture with both classes of sensors for the near-term and long-term needs of National Security Space
Date:
January 1, 2009
Creator:
Reeves, Geoffrey; O'Brien, Paul; Mazur, Joe & Ginet, Gregory
Object Type:
Report
System:
The UNT Digital Library
Investigations of the small-scale thermal behavior of sol-gel thermites.
Sol-gel thermites, formulated from nanoporous oxides and dispersed fuel particles, may provide materials useful for small-scale, intense thermal sources, but understanding the factors affecting performance is critical prior to use. Work was conducted on understanding the synthesis conditions, thermal treatments, and additives that lead to different performance characteristics in iron oxide sol-gel thermites. Additionally, the safety properties of sol-gel thermites were investigated, especially those related to air sensitivity. Sol-gel thermites were synthesized using a variety of different techniques and there appear to be many viable routes to relatively equivalent thermites. These thermites were subjected to several different thermal treatments under argon in a differential scanning calorimeter, and it was shown that a 65 C hold for up to 200 minutes was effective for the removal of residual solvent, thus preventing boiling during the final thermal activation step. Vacuum-drying prior to this heating was shown to be even more effective at removing residual solvent. The addition of aluminum and molybdenum trioxide (MoO{sub 3}) reduced the total heat release per unit mass upon exposure to air, probably due to a decrease in the amount of reduced iron oxide species in the thermite. For the thermal activation step of heat treatment, three different …
Date:
February 1, 2009
Creator:
Warren, Mial E.; Farrow, Matthew & Tappan, Alexander Smith
Object Type:
Report
System:
The UNT Digital Library
SunLine Transit Agency Fuel Cell Transit Bus: Fourth Evaluation Report (Report and Appendices)
This report describes operations at SunLine Transit Agency for a prototype fuel cell bus and five new compressed natural gas (CNG) buses. This is the fourth evaluation report for this site, and it describes results and experiences from April 2008 through October 2008. These results are an addition to those provided in the previous three evaluation reports.
Date:
January 1, 2009
Creator:
Chandler, K. & Eudy, L.
Object Type:
Report
System:
The UNT Digital Library
Performance of an MPI-only semiconductor device simulator on a quad socket/quad core InfiniBand platform.
This preliminary study considers the scaling and performance of a finite element (FE) semiconductor device simulator on a capacity cluster with 272 compute nodes based on a homogeneous multicore node architecture utilizing 16 cores. The inter-node communication backbone for this Tri-Lab Linux Capacity Cluster (TLCC) machine is comprised of an InfiniBand interconnect. The nonuniform memory access (NUMA) nodes consist of 2.2 GHz quad socket/quad core AMD Opteron processors. The performance results for this study are obtained with a FE semiconductor device simulation code (Charon) that is based on a fully-coupled Newton-Krylov solver with domain decomposition and multilevel preconditioners. Scaling and multicore performance results are presented for large-scale problems of 100+ million unknowns on up to 4096 cores. A parallel scaling comparison is also presented with the Cray XT3/4 Red Storm capability platform. The results indicate that an MPI-only programming model for utilizing the multicore nodes is reasonably efficient on all 16 cores per compute node. However, the results also indicated that the multilevel preconditioner, which is critical for large-scale capability type simulations, scales better on the Red Storm machine than the TLCC machine.
Date:
January 1, 2009
Creator:
Shadid, John Nicolas & Lin, Paul Tinphone
Object Type:
Report
System:
The UNT Digital Library
Economic Development Benefits from Wind Energy in Nebraska: A Report for the Nebraska Energy Office (Revised)
This report focuses on the economic development impacts estimated from building and operating 7,800 MW of new wind power in Nebraska. This level of development is on the scale envisioned in the Department of Energy (DOE) report 20% Wind Energy by 2030. A practical first step to building 7,800 of wind is completing 1,000 MW. We also include the estimated economic impacts to Nebraska from building 1,000 MW of wind power. Our primary analysis indicates that the development and construction of approximately 7,800 MW of wind energy in Nebraska by 2030 will support 20,600 to 36,500 annual full-time equivalents (AFTE). In addition, operating the full 7,800 MW of wind energy could support roughly 2,000 to 4,000 full-time workers throughout the operating life of the wind facilities (LFTE). Nebraska's economy is estimated to see an average annual boost in economic activity ranging from $140 million to $260 million solely from construction and development related activities between 2011 and 2030. An additional boost of $250 - $442 million annually is estimated from operating 7,800 MW of wind capacity.
Date:
June 1, 2009
Creator:
Lantz, E.
Object Type:
Report
System:
The UNT Digital Library
Potential for Reducing Blade-Tip Acoustic Emissions for Small Wind Turbines: June 1, 2007 - July 31, 2008
This report provides results of wind tunnel aroacoustic tests conducted on a small wind turbine blade in the open-jet test section of the Georgia Tech Research Institute Flight Simulation Facility.
Date:
February 1, 2009
Creator:
Migliore, P.
Object Type:
Report
System:
The UNT Digital Library
Providing Reliability Services through Demand Response: A Prelimnary Evaluation of the Demand Response Capabilities of Alcoa Inc.
Demand response is the largest underutilized reliability resource in North America. Historic demand response programs have focused on reducing overall electricity consumption (increasing efficiency) and shaving peaks but have not typically been used for immediate reliability response. Many of these programs have been successful but demand response remains a limited resource. The Federal Energy Regulatory Commission (FERC) report, 'Assessment of Demand Response and Advanced Metering' (FERC 2006) found that only five percent of customers are on some form of demand response program. Collectively they represent an estimated 37,000 MW of response potential. These programs reduce overall energy consumption, lower green house gas emissions by allowing fossil fuel generators to operate at increased efficiency and reduce stress on the power system during periods of peak loading. As the country continues to restructure energy markets with sophisticated marginal cost models that attempt to minimize total energy costs, the ability of demand response to create meaningful shifts in the supply and demand equations is critical to creating a sustainable and balanced economic response to energy issues. Restructured energy market prices are set by the cost of the next incremental unit of energy, so that as additional generation is brought into the market, the …
Date:
February 1, 2009
Creator:
Starke, Michael R; Kirby, Brendan J; Kueck, John D; Todd, Duane; Caulfield, Michael & Helms, Brian
Object Type:
Report
System:
The UNT Digital Library
Error Reduction for Weigh-In-Motion
Federal and State agencies need certifiable vehicle weights for various applications, such as highway inspections, border security, check points, and port entries. ORNL weigh-in-motion (WIM) technology was previously unable to provide certifiable weights, due to natural oscillations, such as vehicle bouncing and rocking. Recent ORNL work demonstrated a novel filter to remove these oscillations. This work shows further filtering improvements to enable certifiable weight measurements (error < 0.1%) for a higher traffic volume with less effort (elimination of redundant weighing).
Date:
January 1, 2009
Creator:
Hively, Lee M; Abercrombie, Robert K; Scudiere, Matthew B & Sheldon, Frederick T
Object Type:
Report
System:
The UNT Digital Library
Investigation of multi-layer thin films for energy storage.
We investigate here the feasibility of increasing the energy density of thin-film capacitors by construction of a multi-layer capacitor device through ablation and redeposition of the capacitor materials using a high-power pulsed ion beam. The deposition experiments were conducted on the RHEPP-1 facility at Sandia National Laboratories. The dielectric capacitor filler material was a composition of Lead-Lanthanum-Zirconium-Titanium oxide (PLZT). The energy storage can be increased by using material of intrinsically high dielectric constant, and constructing many thin layers of this material. For successful device construction, there are a number of challenging requirements including correct stoichiometric and crystallographic composition of the deposited PLZT. This report details some success in satisfying these requirements, even though the attempt at device manufacture was unsuccessful. The conclusion that 900 C temperatures are necessary to reconstitute the deposited PLZT has implications for future manufacturing capability.
Date:
January 1, 2009
Creator:
Renk, Timothy Jerome & Monson, Todd
Object Type:
Report
System:
The UNT Digital Library
Effect of Intake Air Filter Condition on Vehicle Fuel Economy
The U.S. Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy and the U.S. Environmental Protection Agency (EPA) jointly maintain a fuel economy website (www.fueleconomy.gov), which helps fulfill their responsibility under the Energy Policy Act of 1992 to provide accurate fuel economy information [in miles per gallon (mpg)] to consumers. The site provides information on EPA fuel economy ratings for passenger cars and light trucks from 1985 to the present and other relevant information related to energy use such as alternative fuels and driving and vehicle maintenance tips. In recent years, fluctuations in the price of crude oil and corresponding fluctuations in the price of gasoline and diesel fuels have renewed interest in vehicle fuel economy in the United States. (User sessions on the fuel economy website exceeded 20 million in 2008 compared to less than 5 million in 2004 and less than 1 million in 2001.) As a result of this renewed interest and the age of some of the references cited in the tips section of the website, DOE authorized the Oak Ridge National Laboratory (ORNL) Fuels, Engines, and Emissions Research Center (FEERC) to initiate studies to validate and improve these tips. This report documents a …
Date:
February 1, 2009
Creator:
Norman, Kevin M; Huff, Shean P & West, Brian H
Object Type:
Report
System:
The UNT Digital Library
Search for admixture of scalar top quarks in the t anti-t lepton+jets final state at s**(1/2) = 1.96-TeV
A search for pair production of the lightest supersymmetric partner of the top quark, {tilde t}{sub 1}, is performed in the lepton+jets channel using 0.9 fb{sup -1} of data collected by the D0 experiment. Kinematic differences between {tilde t}{sub 1}{bar {tilde t}}{sub 1} and the dominant top quark pair production background are used to separate the two processes. First limits from Run II of the Fermilab Tevatron Collider for the scalar top quark decaying to a chargino and a b quark ({tilde t}{sub 1} {yields} {tilde {chi}}{sub 1}{sup +} b) are obtained for scalar top quark masses of 130-190 GeV and chargino masses of 90-150 GeV.
Date:
January 1, 2009
Creator:
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T. et al.
Object Type:
Article
System:
The UNT Digital Library
Physics design of front ends for superconducting ion linacs
Superconducting (SC) technology is the only option for CW linacs and is also an attractive option for pulsed linacs. SC cavities are routinely used for proton and H{sup -} beam acceleration above 185 MeV. Successful development of SC cavities covering the lower velocity range (down to 0.03c) is a very strong basis for the application of SC structures in the front ends of high energy linacs. Lattice design and related high-intensity beam physics issues in a {approx}400 MeV linac that uses SC cavities will be presented in this talk. In particular, axially-symmetric focusing by SC solenoids provides strong control of beam space-charge and a compact focusing lattice. As an example, we discuss the SC front-end of the H{sup -} linac for the FNAL Proton Driver.
Date:
January 1, 2009
Creator:
Ostroumov, P. N. & Carneiro, J. P.
Object Type:
Article
System:
The UNT Digital Library
Next Generation Nuclear Plant Project Technology Development Roadmaps: The Technical Path Forward
This document presents the Next Generation Nuclear Plant (NGNP) Systems, Subsystems, and Components, establishes a baseline for the current technology readiness status, and provides a path forward to achieve increasing levels of technical maturity.
Date:
January 1, 2009
Creator:
Collins, John
Object Type:
Report
System:
The UNT Digital Library
Studies on Backside Al-Contact Formation in Si Solar Cells: Fundamental Mechanisms; Preprint
This paper describes our investigations on the formation of back contacts in screen-printed solar cells, and how most requirements of a good back contact can be met by a suitable process.
Date:
February 1, 2009
Creator:
Sopori, B.; Mehta, V.; Rupnowski, P.; Moutinho, H.; Shaikh, A.; Khadilkar, C. et al.
Object Type:
Article
System:
The UNT Digital Library
Graphite oxidation modeling for application in MELCOR.
The Arrhenius parameters for graphite oxidation in air are reviewed and compared. One-dimensional models of graphite oxidation coupled with mass transfer of oxidant are presented in dimensionless form for rectangular and spherical geometries. A single dimensionless group is shown to encapsulate the coupled phenomena, and is used to determine the effective reaction rate when mass transfer can impede the oxidation process. For integer reaction order kinetics, analytical expressions are presented for the effective reaction rate. For noninteger reaction orders, a numerical solution is developed and compared to data for oxidation of a graphite sphere in air. Very good agreement is obtained with the data without any adjustable parameters. An analytical model for surface burn-off is also presented, and results from the model are within an order of magnitude of the measurements of burn-off in air and in steam.
Date:
January 1, 2009
Creator:
Gelbard, Fred
Object Type:
Report
System:
The UNT Digital Library
Generation Interconnection Policies and Wind Power: A Discussion of Issues, Problems, and Potential Solutions
This report describes the adoption and implementation of FERC Order 2003 and the reasons for the sharp rise in generation interconnection filings in recent years.
Date:
January 1, 2009
Creator:
Porter, K.; Fink, S.; Mudd, C. & DeCesaro, J.
Object Type:
Report
System:
The UNT Digital Library
Thermochemical Process Development Unit: Researching Fuels from Biomass, Bioenergy Technologies (Fact Sheet)
The Thermochemical Process Development Unit (TCPDU) at the National Renewable Energy Laboratory (NREL) is a unique facility dedicated to researching thermochemical processes to produce fuels from biomass.
Date:
January 1, 2009
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library