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Development of a Novel Catalyst for NO Decomposition
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 preferable to the SCR process because it will eliminate the costs and operating problems associated with the use of an external reducing species. The most promising decomposition catalysts are transition metal (especially copper)-exchanged zeolites, perovskites, and noble metals supported on metal oxides such as alumina, silica, and ceria. The main shortcoming of the noble metal reducible oxide (NMRO) catalysts is that they are prone to deactivation by oxygen. It has been reported that catalysts containing tin oxide show oxygen adsorption behavior that may involve hydroxyl groups attached to the tin oxide. This is different than that observed with other noble metal-metal oxide combinations, which have the oxygen adsorbing on the noble metal and subsequently spilling over to the metal oxide. This observation …
Date:
October 22, 2004
Creator:
Akyurtlu, Ates & Akyurtlu, Jale F.
Object Type:
Report
System:
The UNT Digital Library
Development of a Novel Catalyst for NO Decomposition
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 preferable to the SCR process because it will eliminate the costs and operating problems associated with the use of an external reducing species. The most promising decomposition catalysts are transition metal (especially copper)-exchanged zeolites, perovskites, and noble metals supported on metal oxides such as alumina, silica, and ceria. The main shortcoming of the noble metal reducible oxide (NMRO) catalysts is that they are prone to deactivation by oxygen. It has been reported that catalysts containing tin oxide show oxygen adsorption behavior that may involve hydroxyl groups attached to the tin oxide. This is different than that observed with other noble metal-metal oxide combinations, which have the oxygen adsorbing on the noble metal and subsequently spilling over to the metal oxide. This observation …
Date:
May 1, 2004
Creator:
Akyurtlu, Ates & Akyurtlu, Jale F.
Object Type:
Report
System:
The UNT Digital Library
Sandia National Laboratories Laboratory Directed Research and Development Program Annual Report: 2003
None
Date:
July 30, 2004
Creator:
Al-Ayat, R
Object Type:
Report
System:
The UNT Digital Library
Evaporative Evolution of a Na-Cl-NO3-K-Ca-SO4-Mg-Si Brine at 95(degree)C: Experiments and Modeling relevant to Yucca Mountain, Nevada, USA
A synthetic Topopah Spring Tuff water representative of one type of pore water at Yucca Mountain, Nevada (USA) was evaporated at 95 C in a series of experiments to determine the geochemical controls for brines that may form on, and possibly impact upon the long-term integrity of waste containers and drip shields at the designated high-level, nuclear-waste repository. Solution chemistry, condensed vapor chemistry, and precipitate mineralogy were used to identify important chemical divides and to validate geochemical calculations of evaporating water chemistry using a high temperature Pitzer thermodynamic database. The water evolved towards a complex ''sulfate type'' brine that contained about 45 mol% Na, 40 mol% Cl, 9 mol% NO{sub 3}, 5 mol% K, and less than 1 mol% each of SO{sub 4}, Ca, Mg, {Sigma}CO{sub 2}(aq), F, and Si. All measured ions in the condensed vapor phase were below detection limits. The mineral precipitates identified were halite, anhydrite, bassanite, niter and nitratine. Trends in the solution composition and identification of CaSO{sub 4} solids suggest that fluorite, carbonate, sulfate, and magnesium-silicate precipitation control the aqueous solution composition of sulfate type waters by removing fluoride, calcium, and magnesium during the early stages of evaporation. In most cases, the high temperature Pitzer …
Date:
August 24, 2004
Creator:
Alai, M; Sutton, M & Carroll, S A
Object Type:
Article
System:
The UNT Digital Library
Guest Artist Recital: 2004-11-04 - Marie-Claire Alain, organ
Access:
Use of this item is restricted to the UNT Community
Recital performed at UNT Main Auditorium on November 4, 2004 at 8:00 pm.
Date:
November 4, 2004
Creator:
Alain, Marie-Claire
Object Type:
Sound
System:
The UNT Digital Library
Relaxation nuclear magnetic resonance imaging (R-NMRI) of desiccation in M9787 silicone pads.
The production and aging of silicone materials remains an important issue in the weapons stockpile due to their utilization in a wide variety of components and systems within the stockpile. Changes in the physical characteristics of silicone materials due to long term desiccation has been identified as one of the major aging effects observed in silicone pad components. Here we report relaxation nuclear magnetic resonance imaging (R-NMRI) spectroscopy characterization of the silica-filled and unfilled polydimethylsiloxane (PDMS) and polydiphenylsiloxane (PDPS) copolymer (M9787) silicone pads within desiccating environments. These studies were directed at providing additional details about the heterogeneity of the desiccation process. Uniform NMR spin-spin relaxation time (T2) images were observed across the pad thickness indicating that the drying process is approximately uniform, and that the desiccation of the M9787 silicone pad is not a H2O diffusion limited process. In a P2O5 desiccation environment, significant reduction of T2 was observed for the silica-filled and unfilled M9787 silicone pad for desiccation up to 225 days. A very small reduction in T2 was observed for the unfilled copolymer between 225 and 487 days. The increase in relative stiffness with desiccation was found to be higher for the unfilled copolymer. These R-NMRI results are …
Date:
June 1, 2004
Creator:
Alam, Todd M; Cherry, Brian Ray & Alam, Mary Kathleen
Object Type:
Report
System:
The UNT Digital Library
Quantification of ammonia binding sites in Davison (Type 3A) zeolite desiccant : a solid-state Nitrogen-15 MAS NMR spectroscopy investigation.
The quantitative analysis of ammonia binding sites in the Davison (Type 3A) zeolite desiccant using solid-state {sup 15}N MAS NMR spectroscopy is reported. By utilizing 15N enriched ammonia ({sup 15}NH{sub 3}) gas, the different adsorption/binding sites within the zeolite were investigated as a function of NH{sub 3} loading. Using {sup 15}N MAS NMR multiple sites were resolved that have distinct cross-polarization dynamics and chemical shift behavior. These differences in the {sup 15}N NMR were used to characterize the adsorption environments in both the pure 3A zeolite and the silicone-molded forms of the desiccant.
Date:
January 1, 2004
Creator:
Alam, Todd Michael; Holland, Gregory P. & Cherry, Brian Ray
Object Type:
Report
System:
The UNT Digital Library
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
This semiannual report summarizes the research performed from 17 April through 16 October 2004. Major portions of the research in several of the project's current eight tasks have been completed, and the results obtained are briefly presented. We have successfully developed the meteorological inputs using the best possible modeling configurations, resulting in improved representation of atmospheric processes. Ingestion of satellite-derived sea surface temperatures in conjunction with the use of our new surface data assimilation technique have resulted in largely improved meteorological inputs to drive the MAQSIP-VGR. The development of the variable-grid-resolution emissions model, SMOKE-VGR, is also largely complete. We expect to develop the final configuration of the SMOKE-VGR during the upcoming reporting period. We are in the process of acquiring the newly released emissions database and offshore emissions data sets to update our archives. The development of the MAQSIP-VGR has been completed and a test run was performed to ensure the functionality of this air quality model. During the upcoming reporting period, we expect to perform the first MAQSIP-VGR simulations over the Houston-Galveston region to study the roles of the meteorology, offshore emissions, and chemistry-transport interactions that determine the temporal and spatial evolution of ozone and its precursors.
Date:
October 16, 2004
Creator:
Alapaty, Kiran
Object Type:
Report
System:
The UNT Digital Library
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
None
Date:
May 17, 2004
Creator:
Alapaty, Kiran
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Kenneth Alberding, June 2, 2004
The National Museum of the Pacific War presents an interview with Kenneth Alberding. Alberding joined the Army Air Forces in January of 1943. He completed navigation training, and also worked in the photo lab printing publicity photos of cadets. He completed radio school in April of 1944 in Traux Field, Madison, Wisconsin. He worked in the Headquarters unit, 456th Squadron, as a radio mechanic on B-29s. He remained in the US throughout the war and was discharged in January of 1946.
Date:
June 2, 2004
Creator:
Alberding, Kenneth
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Kenneth Alberding, June 2, 2004
The National Museum of the Pacific War presents an interview with Kenneth Alberding. Alberding joined the Army Air Forces in January of 1943. He completed navigation training, and also worked in the photo lab printing publicity photos of cadets. He completed radio school in April of 1944 in Traux Field, Madison, Wisconsin. He worked in the Headquarters unit, 456th Squadron, as a radio mechanic on B-29s. He remained in the US throughout the war and was discharged in January of 1946.
Date:
June 2, 2004
Creator:
Alberding, Kenneth
Object Type:
Text
System:
The Portal to Texas History
The Keystone, Fall 2004
Semiannual newsletter of the Special Collections at the Texas State University Alkek Library discussing news, and events related to the Collections' staff, acquisitions, exhibitions, and other relevant topics.
Date:
Autumn 2004
Creator:
Albert B. Alkek Library. Special Collections.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Keystone, Spring 2004
Semiannual newsletter of the Special Collections at the Texas State University Alkek Library discussing news, and events related to the Collections' staff, acquisitions, exhibitions, and other relevant topics.
Date:
Spring 2004
Creator:
Albert B. Alkek Library. Special Collections.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Boundary Layer Cloudiness Parameterizations Using ARM Observations
This study used DOE ARM data and facilities to: (1) study macroscopic properties of continental stratus clouds at SGP and the factors controlling these properties, (2) develop a scientific basis for understanding the processes responsible for the formation of boundary layer clouds using ARM observations in conjunction with simple parametric models and LES, and (3) evaluate cumulus cloud characteristics retrieved from the MMCR operating at TWP-Nauru. In addition we have used high resolution 94 GHz observations of boundary layer clouds and precipitation to: (1) develop techniques for using high temporal resolution Doppler velocities to study large-eddy circulations and turbulence in boundary layer clouds and estimate the limitations of using current and past MMCR data for boundary layer cloud studies, (2) evaluate the capability and limitations of the current MMCR data for estimating reflectivity, vertical velocities, and spectral under low- signal-to-noise conditions associated with weak no n-precipitating clouds, (3) develop possible sampling modes for the new MMCR processors to allow for adequate sampling of boundary layer clouds, and (4) retrieve updraft and downdraft structures under precipitating conditions.
Date:
September 15, 2004
Creator:
Albrecht, Bruce
Object Type:
Report
System:
The UNT Digital Library
Microchannel Cooled Edge Cladding to Establish an Adiabatic Boundary Condition in a Slab Laser
The present invention provides an edge cladding for a slab laser, the edge cladding comprising a cooling channel system therein.
Date:
May 18, 2004
Creator:
Albrecht, Georg F.; Beach, Raymond J. & Solarz, Richard W.
Object Type:
Text
System:
The UNT Digital Library
The neutrino factory and beta beam experiments and development
The long-term prospects for fully exploring three-flavor mixing in the neutrino sector depend upon an ongoing and increased investment in the appropriate accelerator R&D. Two new concepts have been proposed that would revolutionize neutrino experiments, namely the Neutrino Factory and the Beta Beam facility. These new facilities would dramatically improve our ability to test the three-flavor mixing framework, measure CP violation in the lepton sector, and perhaps determine the neutrino mass hierarchy, and, if necessary, probe extremely small values of the mixing angle {theta}{sub 13}. The stunning sensitivity that could be achieved with a Neutrino Factory is described, together with our present understanding of the corresponding sensitivity that might be achieved with a Beta Beam facility. In the Beta Beam case, additional study is required to better understand the optimum Beta Beam energy, and the achievable sensitivity. Neither a Neutrino Factory nor a Beta Beam facility could be built without significant R&D. An impressive Neutrino Factory R&D effort has been ongoing in the U.S. and elsewhere over the last few years and significant progress has been made towards optimizing the design, developing and testing the required accelerator components, and significantly reducing the cost. The recent progress is described here.
Date:
November 1, 2004
Creator:
Albright, C.; Barger, V.; Beacom, J. F.; Berg, J. S.; Black, E.; Blondel, A. et al.
Object Type:
Report
System:
The UNT Digital Library
Neutrino Factory and Beta Beam Experiments and Development.
The long-term prospects for fully exploring three-flavor mixing in the neutrino sector depend upon an ongoing and increased investment in the appropriate accelerator R&D. Two new concepts have been proposed that would revolutionize neutrino experiments, namely the Neutrino Factory and the Beta Beam facility. These new facilities would dramatically improve our ability to test the three-flavor mixing framework, measure CP violation in the lepton sector, and perhaps determine the neutrino mass hierarchy, and, if necessary, probe extremely small values of the mixing angle {theta}{sub 13}. The stunning sensitivity that could be achieved with a Neutrino Factory is described, together with our present understanding of the corresponding sensitivity that might be achieved with a Beta Beam facility. In the Beta Beam case, additional study is required to better understand the optimum Beta Beam energy, and the achievable sensitivity. Neither a Neutrino Factory nor a Beta Beam facility could be built without significant R&D. An impressive Neutrino Factory R&D effort has been ongoing in the U.S. and elsewhere over the last few years and significant progress has been made towards optimizing the design, developing and testing the required accelerator components, and significantly reducing the cost. The recent progress is described here. There …
Date:
September 21, 2004
Creator:
Albright, C.; Berg, J. S.; Fernow, R.; Gallardo, J.; Kahn, S.; Kirk, H. et al.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Albert Albritton, June 15, 2004
The National Museum of the Pacific War presents an interview with Albert Albritton. Albritton joined the Navy in 1937. He served aboard the USS Dobbin (AD-3). They were present during the attack on Pearl Harbor on 7 December 1941. At the time of the attack the Dobbin was moored northeast of Ford Island. After the attack, they picked up survivors and took the wounded to shore. Albritton participated in the Korean War and was discharged in 1957.
Date:
June 15, 2004
Creator:
Albritton, Albert
Object Type:
Text
System:
The Portal to Texas History
Supernova/Acceleration Probe: A Satellite Experiment to Study the Nature of the Dark Energy
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 Universes 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 survey. This design has been optimized to first order and is now under study for further modification and optimization. A 2-m three-mirror anastigmat wide-field telescope feeds a focal plane consisting of a 0.7 square-degree imager tiled with equal areas of optical CCDs and near infrared sensors, and a high efficiency low-resolution integral field spectrograph. The instrumentation suite provides simultaneous discovery and light-curve measurements of supernovae and then can target individual objects for detailed spectral characterization. The SNAP mission will discover thousands of Type Ia supernovae out to z = 3 and will obtain high-signal-to-noise calibrated light-curves and spectra for a subset of > 2000 supernovae at redshifts between z = 0.1 and 1.7 in a northern field and in a southern field. A wide-field survey covering one thousand square degrees in both northern and …
Date:
May 12, 2004
Creator:
Aldering, G.; Althouse, W.; Amanullah, R.; Annis, J.; Astier, P.; Baltay, C. et al.
Object Type:
Article
System:
The UNT Digital Library
Radiation dose measurements of the insertion devices using radiachromic film dosimeters.
The Advanced Photon Source (APS) uses Nd-Fe-B permanent magnets in the insertion devices to produce x-rays for scientific research [1,2]. Earlier investigations have exhibited varying degrees of demagnetization of these magnets [3] due to irradiation from electron beams [4,5,6], {sup 60}Co {gamma}-rays [5], and high-energy neutrons [7,8]. Radiation-induced demagnetization has been observed in the APS insertion devices [9] and was first measured in December of 2001. Partial demagnetization has also been observed in insertion devices at the European Synchrotron Radiation Facility (ESRF) [4,6], where Nd-Fe-B permanent magnets are also used. Growing concern for the lifetime of APS insertion devices, as well as the permanent magnets that will be used in next-generation, high-power light sources, like the FEL [10,11], resulted from the partial demagnetization observations made at both facilities. This concern in relation to radiation-induced demagnetization spurred a long-term project to measure and analyze the absorbed doses received by the APS insertion devices. The project required a reliable photon high-dose dosimetry technique capable of measuring absorbed doses greater than 10{sup 6} rad, which was not readily available at the APS. Through a collaboration with the National Institute of Standards and Technology (NIST), one such technique using radiachromic films was considered, tested, …
Date:
May 25, 2004
Creator:
Alderman, J.; Semones, E. & Job, P. K.
Object Type:
Report
System:
The UNT Digital Library
FINAL REPORT FORMER RADIATION WORKER MEDICAL SURVEILLANCE PROGRAM AT ROCKY FLATS For Department of Energy Programs
The Former Radiation Worker Medical Surveillance Program at Rocky Flats was conducted in Arvada, CO, by Oak Ridge Associated Universities through the Oak Ridge Institute for Science and Education under DOE Contract DE-AC05-00OR22750. Objectives of the program were to obtain information on the value of medical surveillance among at-risk former radiation workers and to provide long-term internal radiation dosimetry information to the scientific community. This program provided the former radiation workers of the Rocky Flats Environmental Technology Site (formerly Rocky Flats Plant) an opportunity to receive follow-up medical monitoring and a re-evaluation of their internal radiation dose. The former Rocky Flats radiation worker population is distinctive because it was a reasonably stable work force that received occupational exposures, at times substantial, over several decades. This report reflects the summation of health outcomes, statistical analyses, and dose assessment information on former Rocky Flats radiation workers to the date of study termination as of March 2004.
Date:
November 1, 2004
Creator:
Aldrich, Joe M.
Object Type:
Report
System:
The UNT Digital Library
Small Column Ion Exchange Analysis for Removal of Cesium from SRS Low Curie Salt Solutions Using Crystalline Silicotitanate (CST) Resin
Savannah River Technology Center (SRTC) researchers modeled ion exchange removal of cesium from dissolved salt waste solutions. The results assist in evaluating proposed configurations for an ion exchange process to remove residual cesium from low curie waste streams. A process for polishing (i.e., removing small amounts) of cesium may prove useful should supernate draining fail to meet the Low Curie Salt (LCS) target limit of 0.1 Ci of Cs-137 per gallon of salt solution. Cesium loading isotherms and column breakthrough curves for Low Curie dissolved salt solutions were computed to provide performance predictions for various column designs.
Date:
April 20, 2004
Creator:
Aleman, Sebastian E. & Hamm, L. L.
Object Type:
Report
System:
The UNT Digital Library
The 'Texas Register' Web-Site Creations and Related Processes: Revised Report - 2003
Report on the Texas Register, a weekly publication by the Office of the Secretary of State. This report discusses a partnership between the University of North Texas (UNT) Libraries and the Office of the Secretary of State to insure permanent storage and public access to the non-current electronic files of the Texas Register.
Date:
2004
Creator:
Alemneh, Daniel Gelaw
Object Type:
Report
System:
The UNT Digital Library
The Redemptive Challenge in Isaiah's Charge
Lecture given Saturday, June 26, 2004 at Abilene Christian University: "Isaiah's charge in Isaiah 6 concerns preaching (until no one can bear to hear another thing, until no one will hear another thing, until there is no hope, until the hearts of the people are so hard they will never turn). However, with the heart of a lover, God sent Isaiah because 'if they did hear,' they 'might' turn. And if they turned, He 'would forgive.'"
Date:
June 26, 2004
Creator:
Alexander, Karen
Object Type:
Sound
System:
The Portal to Texas History