7,808 Matching Results

Search Results

prev Results: 73 - 96 next
open access

Induced Positron Annihiliation Investigation of Cadmium Zinc Telluride Crystal Microstructures

Description: Cadmium-Zinc-Telluride (CZT) crystals are used in semiconductor radiation detectors for the detection of x-ray and gamma radiation. However, production of detector grade crystals is difficult as small variations in compositional uniformity and primarily the zinc content can significantly affect the ability of the CZT crystal to function as a radiation detector. Currently there are no known nondestructive methods that can be used to identify detector grade crystals. The current test method is to… more
Date: June 1, 2005
Creator: Akers, D. W.
Partner: UNT Libraries Government Documents Department
open access

Development of a Novel Catalyst for NO Decomposition

Description: Air pollution arising from the emission of nitrogen oxides as a result of combustion taking place in boilers, furnaces and engines, has increasingly been recognized as a problem. New methods to remove NO{sub x} emissions significantly and economically must be developed. The current technology for post-combustion removal of NO is the selective catalytic reduction (SCR) of NO by ammonia or possibly by a hydrocarbon such as methane. The catalytic decomposition of NO to give N{sub 2} will be prefer… more
Date: March 31, 2005
Creator: Akyurtlu, Ates & Akyurtlu, Jale F
Partner: UNT Libraries Government Documents Department
open access

Development of a Novel Catalyst for NO Decomposition

Description: Air pollution arising from the emission of nitrogen oxides as a result of combustion taking place in boilers, furnaces and engines, has increasingly been recognized as a problem. New methods to remove NO{sub x} emissions significantly and economically must be developed. The current technology for post-combustion removal of NO is the selective catalytic reduction (SCR) of NO by ammonia or possibly by a hydrocarbon such as methane. The catalytic decomposition of NO to give N{sub 2} will be prefer… more
Date: June 27, 2005
Creator: Akyurtlu, Ates & Akyurtlu, Jale F.
Partner: UNT Libraries Government Documents Department
open access

Development of a Novel Catalyst for NO Decomposition

Description: Air pollution arising from the emission of nitrogen oxides as a result of combustion taking place in boilers, furnaces and engines, has increasingly been recognized as a problem. New methods to remove NOx emissions significantly and economically must be developed. The current technology for post-combustion removal of NO is the selective catalytic reduction (SCR) of NO by ammonia or possibly by a hydrocarbon such as methane. The catalytic decomposition of NO to give N{sub 2} will be preferable t… more
Date: September 29, 2005
Creator: Akyurtlu, Ates & Akyurtlu, Jale F.
Partner: UNT Libraries Government Documents Department
open access

Flow Mapping in a Gas-Solid Riser via Computer Automated Radioactive Particle Tracking (CARPT)

Description: Statement of the Problem: Developing and disseminating a general and experimentally validated model for turbulent multiphase fluid dynamics suitable for engineering design purposes in industrial scale applications of riser reactors and pneumatic conveying, require collecting reliable data on solids trajectories, velocities ? averaged and instantaneous, solids holdup distribution and solids fluxes in the riser as a function of operating conditions. Such data are currently not available on the sa… more
Date: June 4, 2005
Creator: Al-Dahhan, Muthanna; Dudukovic, Milorad P.; Bhusarapu, Satish; O'hern, Timothy J.; Trujillo, Steven & Prairie, Michael R.
Partner: UNT Libraries Government Documents Department
open access

Sensor Acquisition for Water Utilities: A Survey and Technology List

Description: The early detection of the deliberate biological and chemical contamination of water distribution systems is a necessary capability for securing the nation's water supply. Current and emerging early-detection technology capabilities and shortcomings need to be identified and assessed to provide government agencies and water utilities with an improved methodology for assessing the value of installing these technologies. The Department of Homeland Security (DHS) has tasked a multi-laboratory team… more
Date: March 7, 2005
Creator: Alai, M; Glascoe, L; Love, A; Johnson, M & Einfeld, W
Partner: UNT Libraries Government Documents Department
open access

Sensor Acquisition for Water Utilities: Survey, Down Selection Process, and Technology List

Description: The early detection of the biological and chemical contamination of water distribution systems is a necessary capability for securing the nation's water supply. Current and emerging early-detection technology capabilities and shortcomings need to be identified and assessed to provide government agencies and water utilities with an improved methodology for assessing the value of installing these technologies. The Department of Homeland Security (DHS) has tasked a multi-laboratory team to evaluat… more
Date: June 29, 2005
Creator: Alai, M; Glascoe, L; Love, A; Johnson, M & Einfeld, W
Partner: UNT Libraries Government Documents Department
open access

Smart Fuel Cell Operated Residential Micro-Grid Community

Description: To build on the work of year one by expanding the smart control algorithm developed to a micro-grid of ten houses; to perform a cost analysis; to evaluate alternate energy sources; to study system reliability; to develop the energy management algorithm, and to perform micro-grid software and hardware simulations.
Date: April 13, 2005
Creator: Alam, Mohammad S.
Partner: UNT Libraries Government Documents Department
open access

MODELING THE TRANSPORT AND CHEMICAL EVOLUTION OF ONSHORE AND OFFSHORE EMISSIONS AND THEIR IMPACT ON LOCAL AND REGIONAL AIR QUALITY USING A VARIABLE-GRID-RESOLUTION AIR QUALITY MODEL

Description: This second annual report summarizes the research performed from 17 April 2004 through 16 April 2005. Major portions of the research in several of the project's current eight tasks have been completed. We have successfully developed the meteorological inputs using the best possible modeling configurations, resulting in improved representation of atmospheric processes. The development of the variable-grid-resolution emissions model, SMOKE-VGR, is also completed. The development of the MAQSIP-VGR… more
Date: May 13, 2005
Creator: Alapaty, Kiran
Partner: UNT Libraries Government Documents Department
open access

Probing Dark Energy via Weak Gravitational Lensing with the Supernova Acceleration Probe (SNAP)

Description: SNAP is a candidate for the Joint Dark Energy Mission (JDEM) that seeks to place constraints on the dark energy using two distinct methods. The first, Type Ia SN, is discussed in a separate white paper. The second method is weak gravitational lensing, which relies on the coherent distortions in the shapes of background galaxies by foreground mass structures. The excellent spatial resolution and photometric accuracy afforded by a 2-meter space-based observatory are crucial for achieving the high… more
Date: August 8, 2005
Creator: Albert, J.; Aldering, G.; Allam, S.; Althouse, W.; Amanullah, R.; Annis, J. et al.
Partner: UNT Libraries Government Documents Department
open access

Seeing the Nature of the Accelerating Physics: It's a SNAP

Description: For true insight into the nature of dark energy, measurements of the precision and accuracy of the Supernova/Acceleration Probe (SNAP) are required. Precursor or scaled-down experiments are unavoidably limited, even for distinguishing the cosmological constant. They can pave the way for, but should not delay, SNAP by developing calibration, refinement, and systematics control (and they will also provide important, exciting astrophysics).
Date: August 5, 2005
Creator: Albert, J.; Aldering, G.; Allam, S.; Althouse, W.; Amanullah, R.; Annis, J. et al.
Partner: UNT Libraries Government Documents Department
open access

Supernova Acceleration Probe: Studying Dark Energy with Type Ia Supernovae

Description: The Supernova Acceleration Probe (SNAP) will use Type Ia supernovae (SNe Ia) as distance indicators to measure the effect of dark energy on the expansion history of the Universe. (SNAP's weak-lensing program is described in a separate White Paper.) The experiment exploits supernova distance measurements up to their fundamental systematic limit; strict requirements on the monitoring of each supernova's properties leads to the need for a space-based mission. Results from pre-SNAP experiments, whi… more
Date: August 8, 2005
Creator: Albert, J.; Aldering, G.; Allam, S.; Althouse, W.; Amanullah, R.; Annis, J. et al.
Partner: UNT Libraries Government Documents Department
open access

Supernova / Acceleration Probe: a Satellite Experiment to Study the Nature of the Dark Energy

Description: The Supernova/Acceleration Probe (SNAP) is a proposed space-based experiment designed to study the dark energy and alternative explanations of the acceleration of the Universe's expansion by performing a series of complementary systematics-controlled astrophysical measurements. We here describe a self-consistent reference mission design that can accomplish this goal with the two leading measurement approaches being the Type Ia supernova Hubble diagram and a wide-area weak gravitational lensing … more
Date: August 15, 2005
Creator: Aldering, G.; Althouse, W.; Amanullah, R.; Annis, J.; Astier, P.; Baltay, C. et al.
Partner: UNT Libraries Government Documents Department
open access

Achieve Continuous Injection of Solid Fuels into Advanced Combustion System Pressures

Description: The overall objective of this project is the development of a mechanical rotary-disk feeder, known as the Stamet Posimetric High Pressure Solids Feeder System, to feed dry granular coal continuously and controllably into pressurized environments of up to 35 kg/cm{sup 2} (500 psi). This was to be accomplished in two phases. The first task was to review materials handling experience in pressurized operations as it related to the target pressures for this project, and review existing coal preparat… more
Date: July 1, 2005
Creator: Aldred, Derek L. & Saunders, Timothy
Partner: UNT Libraries Government Documents Department
open access

Staggered-grid finite-difference acoustic modeling with the Time-Domain Atmospheric Acoustic Propagation Suite (TDAAPS).

Description: This document is intended to serve as a users guide for the time-domain atmospheric acoustic propagation suite (TDAAPS) program developed as part of the Department of Defense High-Performance Modernization Office (HPCMP) Common High-Performance Computing Scalable Software Initiative (CHSSI). TDAAPS performs staggered-grid finite-difference modeling of the acoustic velocity-pressure system with the incorporation of spatially inhomogeneous winds. Wherever practical the control structure of the co… more
Date: May 1, 2005
Creator: Aldridge, David Franklin; Collier, Sandra L. (U.S. Army Research Laboratory); Marlin, David H. (U.S. Army Research Laboratory); Ostashev, Vladimir E. (NOAA/Environmental Technology Laboratory); Symons, Neill Phillip & Wilson, D. Keith (U.S. Army Cold Regions Research Engineering Lab.)
Partner: UNT Libraries Government Documents Department
open access

Precision Electroweak Measurements on the Z Presonance

Description: The authors report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron-positron colliders SLC and LEP. the data consist of 17 million Z decays accumulated by the ALEPH, DELPHI, L3 and OPAL experiments at LEP, and 600 thousand Z decays by the SLD experiment using a polarized beam at SLC. The measurements include cross-sections, forward-backward asymmetries and polarized asymmetries. The mass and width of the Z boson, m{s… more
Date: September 8, 2005
Creator: Aleph,Delphi,L3,Opal,SLD , Collaborations
Partner: UNT Libraries Government Documents Department
open access

Electron Beam Ion Source Preinjector Project (EBIS) Conceptual Design Report.

Description: This report describes a new heavy ion pre-injector for the Relativistic Heavy Ion Collider (RHIC) based on a high charge state Electron Beam Ion Source (EBIS), a Radio Frequency Quadrupole (RFQ) accelerator, and a short Linear accelerator (Linac). The highly successful development of an EBIS at Brookhaven National Laboratory (BNL) now makes it possible to replace the present pre-injector that is based on an electrostatic Tandem with a reliable, low maintenance Linac-based pre-injector. Linac-ba… more
Date: September 1, 2005
Creator: Alessi, J.; Barton, D.; Beebe, E.; Gassner, D.; Grandinetti, R.; Hseuh, H. et al.
Partner: UNT Libraries Government Documents Department
open access

Use of Artificial Burrows by Burrowing Owls (Athene cunicularia) at the HAMMER Facility on the U.S. Department of Energy Hanford Site

Description: In 2003 the U.S. Department of Energy (DOE) constructed an Emergency Vehicle Operations Course (EVOC) at the Hazardous Material Management and Emergency Response Training and Education Center (HAMMER) in the southern portion of the Hanford Site. Preliminary surveys during 2001 identified an active burrowing owl (Athene cunicularia) burrow and three burrowing owls within the proposed development area. Burrowing owls were classified as a federal species of concern, a Washington State ?candidate? … more
Date: September 30, 2005
Creator: Alexander, Amanda K.; Sackschewsky, Michael R. & Duberstein, Corey A.
Partner: UNT Libraries Government Documents Department
open access

Final Report for 'An Abstract Job Handling Grid Service for Dataset Analysis'

Description: For Phase I of the Job Handling project, Tech-X has built a Grid service for processing analysis requests, as well as a Graphical User Interface (GUI) client that uses the service. The service is designed to generically support High-Energy Physics (HEP) experimental analysis tasks. It has an extensible, flexible, open architecture and language. The service uses the Solenoidal Tracker At RHIC (STAR) experiment as a working example. STAR is an experiment at the Relativistic Heavy Ion Collider (RH… more
Date: July 11, 2005
Creator: Alexander, David A.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen