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A Comprehensive Study of Surface Chemistry for Application to Engine NOx Aftertreatment
This work focuses on developing a scientific understanding of the processes associated with NO{sub x} trap operation. NO{sub x} traps are the most advanced technology for achieving future emissions standards with diesel engines. Successful development of NO{sub x} traps will allow widespread use of diesel engines in light-duty vehicles, reducing oil imports by as much as 60%. Diesel engines have a high efficiency and low maintenance that makes them the ideal choice for transportation applications. Use of diesel engines in all light-duty vehicles would reduce oil consumption in the USA by 30% and oil imports by 60%, considerably improving our energy security. For heavy trucks, there is no viable alternative to diesel engines. Only diesel engines can provide the necessary high efficiency and long life. These benefits are offset by high emission of pollutants. Diesel engines have high emissions of NO{sub x} and particulate matter. Over the last 20 years, EPA has been reducing allowable emissions from diesel engines, and NO{sub x} emissions are scheduled to be cut by a factor of 10 over the next 7 years. The target NO{sub x} emissions for year 2010 is 0.20 g/hp-hr. This value is well below 1 g/hp-hr, which has been identified …
Date:
February 19, 2004
Creator:
Aceves, S M; Piggot, T; Pitz, W; Mundy, C; Kuo, W & Havstad, M
Object Type:
Report
System:
The UNT Digital Library
Spatial Analysis of Emissions Sources for HCCI Combustion at Low Loads Using a Multi-Zone Model
We have conducted a detailed numerical analysis of HCCI engine operation at low loads to investigate the sources of HC and CO emissions and the associated combustion inefficiencies. Engine performance and emissions are evaluated as fueling is reduced from typical HCCI conditions, with an equivalence ratio f = 0.26 to very low loads (f = 0.04). Calculations are conducted using a segregated multi-zone methodology and a detailed chemical kinetic mechanism for iso-octane with 859 chemical species. The computational results agree very well with recent experimental results. Pressure traces, heat release rates, burn duration, combustion efficiency and emissions of hydrocarbon, oxygenated hydrocarbon, and carbon monoxide are generally well predicted for the whole range of equivalence ratios. The computational model also shows where the pollutants originate within the combustion chamber, thereby explaining the changes in the HC and CO emissions as a function of equivalence ratio. The results of this paper contribute to the understanding of the high emission behavior of HCCI engines at low equivalence ratios and are important for characterizing this previously little explored, yet important range of operation.
Date:
February 20, 2004
Creator:
Aceves, S. M.; Flowers, D. L.; Espinosa-Loza, F.; Martinez-Frias, J.; Dec, J. E.; Sjoberg, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Observation of the narrow state x (3872) --> j/psi pi+ pi- in pbar p collisions at s**(1/2) = 1.96 tev
The authors report the observation of a narrow state decaying into J/{psi}{pi}{sup +}{pi}{sup -} and produced in 220 pb{sup -1} of {bar p}p collisions at {radical}s = 1.96 TeV in the CDF II experiment. They observe 730 {+-} 90 decays. The mass is measured to be 3871.3 {+-} 0.7(stat) {+-} 0.4(syst) MeV/c{sup 2}, with an observed width consistent with the detector resolution. This is in agreement with the recent observation by the Belle Collaboration of the X(3872) meson.
Date:
February 27, 2004
Creator:
Acosta, D.
Object Type:
Report
System:
The UNT Digital Library
Advisory Commission on Electronic Commerce
Home of the Advisory Commission on Electronic Commerce, created by Congress to produce recommendations on electronic commerce and tax policy, critical information age issues with global implications.
Date:
February 1, 2004
Creator:
Advisory Commission on Electronic Commerce
Object Type:
Website
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 5, Ed. 1 Thursday, February 5, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
February 5, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 5, Ed. 1 Thursday, February 12, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
February 12, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 6, Ed. 1 Thursday, February 19, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
February 19, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 8, Ed. 1 Thursday, February 26, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
February 26, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Oral History Interview with LeRoy Ellis Cox, February 5, 2004
Access:
Use of this item is restricted to the UNT Community
Interview with LeRoy Ellis Cox. The interview includes Cox's personal experiences about childhood and early adulthood in Texas, New Mexico, Arizona, and Colorado, World War-II-era Army Air Corps training in armaments and electronics, stateside service in the 303rd Bomb Group of the Eighth Air Force, aviation cadet training, serving as a B-25 instructor pilot, and as a DC-3 tow pilot for the glider program.
Date:
February 5, 2004
Creator:
Alexander, William J. & Cox, LeRoy E., 1919-
Object Type:
Book
System:
The UNT Digital Library
Oral History Interview with Douglas R. Crawford, February 25, 2004
Access:
Use of this item is restricted to the UNT Community
Interview with Air Force veteran Douglas R. "Roy" Crawford. The interview includes Crawford's personal experiences about early family life, joining the U.S. Army Air Forces, training as a bulldozer operator, removing radioactive debris from Hiroshima, training as a radar operator at Edwards Air Force Base, California, and working as the radar tracker when Major Chuck Yeager broke the sound barrier in the Bell X-1 on October 19, 1947. Additionally, Crawford talks about his assignments to Clark Air Force Base, Philippines, and Korea, as a forward air observer, his role as an airborne radar operator during the Bay of Pigs invasion and the Cuban Missile Crisis, his various activities with the NASA Space Program, and clandestine missions with the CIA and Air America over Cambodia during the Vietnam War.
Date:
February 25, 2004
Creator:
Alexander, William J. & Crawford, Douglas R., 1929-
Object Type:
Book
System:
The UNT Digital Library
Double-shell target design for the NIF: Noncryogenic ignition and nonlinear mix studies for Stockpile Stewardship
Double-shell ignition is complementary to the baseline approach by virtue of not requiring: (1) cryogenic preparation and fielding, (2) high-contrast pulse-shaping for shock-timing, and (3) demanding x-ray flux symmetry control. The use of simpler low-contrast pulse-shaping potentially allows more benign hohlraum conditions by reducing the risk of laser backscatter. In addition, the associated higher laser fluence threshold for optics damage initiation allows the possibility of more routine high-fluence shots with 2{omega} on the NIF. Based on LDRD-sponsored research in FY01-03 on NIF double-shell ignition target designs, the feasibility of this approach was advanced through both a highly successful implosion campaign on the Omega laser facility and a variety of design improvements for mitigating instability. The double-shell implosion campaign on Omega achieved the important milestone of repeatably demonstrating dominant primary (2.45 MeV) neutron production from the mix-susceptible compressional phase of a double-shell implosion, using fall-line design optimization and exacting fabrication standards. Showing effective control of fuel-pusher mix during final compression is an essential element for achieving ignition. In our studies to control mix by reducing hydrodynamic instability a new pathway for destructive Rayleigh-Taylor growth on the outer surface of the inner shell at ignition scales was identified. However, highly resolved multi-mode …
Date:
February 10, 2004
Creator:
Amendt, P
Object Type:
Report
System:
The UNT Digital Library
Southwest Retort, Volume 56, Number 6, February 2004
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
February 2004
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Asymmetric injection of cathodic arc plasma into a macroparticlefilter
The cathodic arc plasmas produced by cathode spots usuallyinclude macroparticles, which is undesirable for many applications. Acommon way of removing macroparticles is to use curved solenoid filterswhich guide the plasma from the source to the substrate. In this work, anarc source with relatively small cathode is used, limiting the possiblelocations of plasma production. The relative position of cathodic arcsource and macroparticle filtered was systematically varied and thefiltered plasma current was recorded. It was found that axis-symmetricplasma injection leads to maximum throughput only if an anode aperturewas used, which limited the plasma to near-axis flow by scraping offplasma at larger angles to the axis. When the anode aperture was removed,more plasma could enter the filter. In this case, maximum filtered ioncurrent was achieved when the plasma was injected off-axis, namely offsetin the direction where the filter is curved. Such behavior wasanticipated because the plasma column in the filter is known to beshifted by ExB and centrifugal drift as well as by non-axis-symmetriccomponents of the magnetic field in the filter entrance and exit plane.The data have implications for plasma transport variations caused bydifferent spot locations on cathodes that are not small compared to thefilter cross section.
Date:
February 11, 2004
Creator:
Anders, Andre & MacGill, Robert A.
Object Type:
Article
System:
The UNT Digital Library
White paper report on using nuclear reactors to search for a value of theta13
There has been superb progress in understanding the neutrino sector of elementary particle physics in the past few years. It is now widely recognized that the possibility exists for a rich program of measuring CP violation and matter effects in future accelerator {nu} experiments, which has led to intense efforts to consider new programs at neutrino superbeams, off-axis detectors, neutrino factories and beta beams. However, the possibility of measuring CP violation can be fulfilled only if the value of the neutrino mixing parameter {theta}{sub 13} is such that sin{sup 2} (2{theta}{sub 13}) greater than or equal to on the order of 0.01. The authors of this white paper are an International Working Group of physicists who believe that a timely new experiment at a nuclear reactor sensitive to the neutrino mixing parameter {theta}{sub 13} in this range has a great opportunity for an exciting discovery, a non-zero value to {theta}{sub 13}. This would be a compelling next step of this program. We are studying possible new reactor experiments at a variety of sites around the world, and we have collaborated to prepare this document to advocate this idea and describe some of the issues that are involved.
Date:
February 26, 2004
Creator:
Anderson, K.; Anjos, J. C.; Ayres, D.; Beacom, J.; Bediaga, I.; de Bellefon, A. et al.
Object Type:
Report
System:
The UNT Digital Library
Executive Summary-Final Technical Report
The primary goal since inception of this DOE grant award in 1991 to Wellman Laboratories of Photomedicine, Harvard Medical School, Massachusetts General Hospital, has been to support competitive research fellowships aimed at solving important medical problems, contributing significant new knowledge and/or technology. This approach was taken according to the original intent of the DOE program, to foster excellent centers for research and development of lasers and optics in medicine. Laser photomedicine broadly encompasses optical therapy and optical diagnostics, within any organ system. The research supported clearly reflects this breadth and depth.
Date:
February 18, 2004
Creator:
Anderson, R. R.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Tom Anderson, February 3, 2004
The National Museum of the Pacific War presents an oral interview with Tom Anderson. Anderson dropped out of college in 1941 and hitchhiked from Texas to San Diego. There he worked for Consolidated Aircraft, drafting plans for the B-32, B-36, and C-99. He then transferred to the Fort Worth plant, where he stayed until 1944, when he enlisted in the Navy. He was selected for radar technician training, and after boot camp he studied electronics in Chicago, followed by airborne radar training in Corpus Christi. He had a lifelong interest in flying and looked forward to his first duty assignment. But when the war ended in Japan, his radar conning class was cancelled and he was reassigned to the radar shop of CASU-5 at the Naval Air Station in San Diego. Anderson was discharged into the Armed Guard in March 1946, taking up work at the Fiscal and Disbursement Office of the Adjutant General at Camp Mabry. In 1950 he returned to school and joined the Army Reserves, retiring in 1966 as a lieutenant colonel.
Date:
February 3, 2004
Creator:
Anderson, Tom
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Tom Anderson, February 3, 2004
The National Museum of the Pacific War presents an oral interview with Tom Anderson. Anderson dropped out of college in 1941 and hitchhiked from Texas to San Diego. There he worked for Consolidated Aircraft, drafting plans for the B-32, B-36, and C-99. He then transferred to the Fort Worth plant, where he stayed until 1944, when he enlisted in the Navy. He was selected for radar technician training, and after boot camp he studied electronics in Chicago, followed by airborne radar training in Corpus Christi. He had a lifelong interest in flying and looked forward to his first duty assignment. But when the war ended in Japan, his radar conning class was cancelled and he was reassigned to the radar shop of CASU-5 at the Naval Air Station in San Diego. Anderson was discharged into the Armed Guard in March 1946, taking up work at the Fiscal and Disbursement Office of the Adjutant General at Camp Mabry. In 1950 he returned to school and joined the Army Reserves, retiring in 1966 as a lieutenant colonel.
Date:
February 3, 2004
Creator:
Anderson, Tom
Object Type:
Text
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 105, No. 274, Ed. 1 Sunday, February 1, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 1, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 105, No. 275, Ed. 1 Monday, February 2, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 2, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 105, No. 276, Ed. 1 Tuesday, February 3, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 3, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 105, No. 277, Ed. 1 Wednesday, February 4, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 4, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 105, No. 278, Ed. 1 Thursday, February 5, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 5, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 105, No. 279, Ed. 1 Friday, February 6, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 6, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 105, No. 280, Ed. 1 Sunday, February 8, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 8, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History