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7,234 Matching Results
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Measurements of inclusive $W+$jets production rates as a function of jet transverse momentum in $p\bar{p}$ collisions at $\sqrt{s}=1.96$~TeV
This Letter describes measurements of inclusive W({yields} e{nu}) + n jet cross sections (n = 1-4), presented as total inclusive cross sections and differentially in the n{sup th} jet transverse momentum. The measurements are made using data corresponding to an integrated luminosity of 4.2 fb{sup -1} collected by the D0 detector at the Fermilab Tevatron Collider, and achieve considerably smaller uncertainties on W+jets production cross sections than previous measurements. The measurements are compared to next-to-leading order perturbative QCD (pQCD) calculations in the n = 1-3 jet multiplicity bins and to leading order pQCD calculations in the 4-jet bin. The measurements are generally in agreement with pQCD predictions, although certain regions of phase space are identified where the calculations could be improved.
Date:
June 1, 2011
Creator:
Abazov, Victor Mukhamedovich; Abbott, Braden Keim; Acharya, Bannanje Sripath; Adams, Mark Raymond; Adams, Todd; Alexeev, Guennadi D. et al.
Object Type:
Article
System:
The UNT Digital Library
Measurement of the 8B Solar Neutrino Flux with KamLAND
We report a measurement of the neutrino-electron elastic scattering rate from {sup 8}B solar neutrinos based on a 123 kton-day exposure of KamLAND. The background-subtracted electron recoil rate, above a 5.5-MeV analysis threshold is 1.49 {+-} 0.14(stat) {+-} 0.17(syst) events per kton-day. Interpreted as due to a pure electron flavor flux with a {sup 8}B neutrino spectrum, this corresponds to a spectrum integrated flux of 2.77 {+-} 0.26(stat) {+-} 0.32(syst) x 10{sup 6} cm{sup -2}s{sup -1}. The analysis threshold is driven by {sup 208}Tl present in the liquid scintillator, and the main source of systematic uncertainty is due to background from cosmogenic {sup 11}Be. The measured rate is consistent with existing measurements and with standard solar model predictions which include matter-enhanced neutrino oscillation.
Date:
June 4, 2011
Creator:
Abe, S.; Furuno, K.; Gando, A.; Gando, Y.; Ichimura, K.; Ikeda, H. et al.
Object Type:
Article
System:
The UNT Digital Library
INDEPENDENT TECHNICAL ASSESSMENT OF MANAGEMENT OF STORMWATER AND WASTEWATER AT THE SEPARATIONS PROCESS RESEARCH UNIT (SPRU) DISPOSITION PROJECT, NEW YORK
The U.S. Department of Energy (DOE) is currently evaluating the water management procedures at the Separations Process Research Unit (SPRU). The facility has three issues related to water management that require technical assistance: (1) due to a excessive rainfall event in October, 2010, contaminated water collected in basements of G2 and H2 buildings. As a result of this event, the contractor has had to collect and dispose of water offsite; (2) The failure of a sump pump at a KAPL outfall resulted in a Notice of Violation issued by the New York State Department of Environment and Conservation (NYSDEC) and subsequent Consent Order. On-site water now requires treatment and off-site disposition; and (3) stormwater infiltration has resulted in Strontium-90 levels discharged to the storm drains that exceed NR standards. The contractor has indicated that water management at SPRU requires major staff resources (at least 50 persons). The purpose of this review is to determine if the contractor's technical approach warrants the large number of staff resources and to ensure that the technical approach is compliant and in accordance with federal, state and NR requirements.
Date:
June 27, 2011
Creator:
Abitz, R.; Jackson, D. & Eddy-Dilek, C.
Object Type:
Report
System:
The UNT Digital Library
SHIPMENT OF TWO DOE-STD-3013 CONTAINERS IN A 9977 TYPE B PACKAGE
The 9977 is a certified Type B Packaging authorized to ship uranium and plutonium in metal and oxide forms. Historically, the standard container for these materials has been the DOE-STD-3013 which was specifically designed for the long term storage of plutonium bearing materials. The Department of Energy has used the 9975 Packaging containing a single 3013 container for the transportation and storage of these materials. In order to reduce container, shipping, and storage costs, the 9977 Packaging is being certified for transportation and storage of two 3013 containers. The challenges and risks of this content and the 9977s ability to meet the Code of Federal Regulations for the transport of these materials are presented.
Date:
June 6, 2011
Creator:
Abramczyk, G.; Bellamy, S.; Loftin, B. & Nathan, S.
Object Type:
Article
System:
The UNT Digital Library
SHIPMENT OF NON-TRADITIONAL CONTENTS IN THE 9977 TYPE B PACKAGE
The 9977 is a certified Type B Packaging authorized to ship uranium and plutonium in metal and oxide forms. These materials are typically confined within metallic containers designed for ease of handling and to prevent the spread of contamination. The Pacific Northwest National Laboratory (PNNL) uses Pu and U sources for the training of domestic and international customs agents in the identification and detection of radioactive materials (RAM). These materials are packed in polycarbonate containers which permit the trainees to view the RAM. The safety basis was made to authorize the use of these unusual containers. The inclusion of the PNNL Training Source Contents into the 9977 Packaging imposed unique conditions previously unanalyzed. The use of polycarbonate as a content container material, while different from any configuration previously considered, does not raise any safety issues with the package which continues to operate with a large safety margin for temperatures, pressures, containment, dose rates, and subcriticality.
Date:
June 6, 2011
Creator:
Abramczyk, G.; Loftin, B.; Bellamy, S. & Nathan, S.
Object Type:
Article
System:
The UNT Digital Library
RECLAMATION OF RADIOACTIVE MATERIAL PACKAGING COMPONENTS
Radioactive material packages are withdrawn from use for various reasons; loss of mission, decertification, damage, replacement, etc. While the packages themselves may be decertified, various components may still be able to perform to their required standards and find useful service. The Packaging Technology and Pressurized Systems group of the Savannah River National Laboratory has been reducing the cost of producing new Type B Packagings by reclaiming, refurbishing, and returning to service the containment vessels from older decertified packagings. The program and its benefits are presented.
Date:
June 6, 2011
Creator:
Abramczyk, G.; Nathan, S.; Loftin, B. & Bellamy, S.
Object Type:
Article
System:
The UNT Digital Library
DAKOTA JAGUAR 2.1 user's Manual.
JAGUAR (JAva GUi for Applied Research) is a Java software tool providing an advanced text editor and graphical user interface (GUI) to manipulate DAKOTA (Design Analysis Kit for Optimization and Terascale Applications) input specifications. This document focuses on the features necessary for a user to use JAGUAR.
Date:
June 1, 2011
Creator:
Adams, Brian M.; Lefantzi, Sophia; Chan, Ethan & Ruthruff, Joseph R.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with John R. Ahlgren, June 1, 2011
The National Museum of the Pacific War presents an oral interview with John R. Ahlgren. In 1942, Ahlgren, a Navy communications officer, was assigned to Admiral Chester Nimitz's staff at Pearl Harbor. From 1946 to 1947 he was stationed in Russia and worked as a translator and attaché to the US Embassy in Moscow. Ahlgren left the service soon after his time in Moscow.
Date:
June 1, 2011
Creator:
Ahlgren, John R.
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with John R. Ahlgren, June 1, 2011
The National Museum of the Pacific War presents an oral interview with John R. Ahlgren. In 1942, Ahlgren, a Navy communications officer, was assigned to Admiral Chester Nimitz's staff at Pearl Harbor. From 1946 to 1947 he was stationed in Russia and worked as a translator and attaché to the US Embassy in Moscow. Ahlgren left the service soon after his time in Moscow.
Date:
June 1, 2011
Creator:
Ahlgren, John R.
Object Type:
Text
System:
The Portal to Texas History
Solubility of Phenothiazine in Water, Ethanol, and Propylene Glycol at (298.2 to 338.2) K and Their Binary and Ternary Mixtures at 298.2 K
Article on the solubility of phenothiazine in water, ethanol, and propylene glycol at (298.2 to 338.2) K and their binary and ternary mixtures at 298.2 K.
Date:
June 2, 2011
Creator:
Ahmadian, Somaieh; Panahi-Azar, Vahid; Fakhree, Mohammad Amin Abolghassemi; Acree, William E. (William Eugene) & Jouyban, Abolghasem
Object Type:
Article
System:
The UNT Digital Library
Effect of 3-D fields on divertor detachment and associated pedestal profiles in NSTX H-mode plasmas.
None
Date:
June 20, 2011
Creator:
Ahn, J W; Loarte, A; Maingi, R; McLean, A G; Canik, J M; Gray, T K et al.
Object Type:
Article
System:
The UNT Digital Library
The Need for Next Generation of Radiochemists in the USA
In 2009, the nuclear industry employed approximately 120,000 people. Nearly 38 percent of the nuclear industry force will be eligible to retire within the next five years. To maintain the current work force, the industry will need to hire approximately 25,000 more workers by 2015.1 The federal government will also need nuclear workers in the future in its laboratories, the military and government programs. There is a need not only for the entire nuclear community to work with the academia to recruit and train students in a standardized way for employment at nuclear facilities. Several strategies are taking place in the USA, as an example, an initiative developed at the Idaho National Laboratory (INL) is the Institute of Nuclear Science and Technology (INEST) with four Centers of Research and Education (COREs) selected to address some of the most challenging issues facing nuclear energy today: (1) Fuels and Materials, (2) Space Nuclear Research, (3) Fuel Cycle, and (4) Safety and Licensing. Another example is the development of a radiochemistry program at two universities: the University of Nevada Las Vegas (UNLV) and Washington State University (WSU) to attract the next generation work force. This paper will solely focus on the next generation …
Date:
June 1, 2011
Creator:
Akbarzadeh, Mansour; Bakhtiar, Steven & Paviet-Hartmann, Patricia
Object Type:
Article
System:
The UNT Digital Library
X-Ray Spectral Constraints for z ≈ 2 Massive Galaxies: The Identification of Reflection-Dominated Active Galactic Nuclei
This article uses the 4 Ms Chandra Deep Field-South survey to place direct constraints on the ubiquity of z ≈ 2 heavily obscured active galactic nuclei.
Date:
June 6, 2011
Creator:
Alexander, David M.; Bauer, Franz E.; Brandt, William Nielsen; Daddi, Emanuele; Hickox, Ryan; Lehmer, Bret et al.
Object Type:
Article
System:
The UNT Digital Library
Femtosecond spectroscopy with vacuum ultraviolet pulse pairs
We combine different wavelengths from an intense high-order harmonics source with variable delay at the focus of a split-mirror interferometer to conduct pump-probe experiments on gas-phase molecules. We report measurements of the time resolution (< 44fs) and spatial profiles (4 {micro}m x 12 {micro}m) at the focus of the apparatus. We demonstrate the utility of this two-color, high-order-harmonic technique by time resolving molecular hydrogen elimination from C{sub 2} H{sub 4} excited into its absorption band at 161nm.
Date:
June 17, 2011
Creator:
Allison, Tom; Wright, Travis; Stooke, Adam; Khurmi, Champak; van Tilborg, Jeroen; Liu, Yanwei et al.
Object Type:
Article
System:
The UNT Digital Library
Direct Air Capture of CO₂ with Chemicals
This report explores direct air capture (DAC) of carbon dioxide (CO₂) from the atmosphere with chemicals. DAC involves a system in which ambient air flows over a chemical sorbent that selectively removes the CO₂. The CO₂ is then released as a concentrated stream for disposal or reuse, while the sorbent is regenerated and the CO₂-depleted air is returned to the atmosphere.
Date:
June 1, 2011
Creator:
American Physical Society. Panel on Public Affairs
Object Type:
Report
System:
The UNT Digital Library
Nanosensors as Reservoir Engineering Tools to Map Insitu Temperature Distributions in Geothermal Reservoirs
The feasibility of using nanosensors to measure temperature distribution and predict thermal breakthrough in geothermal reservoirs is addressed in this report. Four candidate sensors were identified: melting tin-bismuth alloy nanoparticles, silica nanoparticles with covalently-attached dye, hollow silica nanoparticles with encapsulated dye and impermeable melting shells, and dye-polymer composite time-temperature indicators. Four main challenges associated with the successful implementation of temperature nanosensors were identified: nanoparticle mobility in porous and fractured media, the collection and detection of nanoparticles at the production well, engineering temperature sensing mechanisms that are both detectable and irreversible, and inferring the spatial geolocation of temperature measurements in order to map temperature distribution. Initial experiments were carried out to investigate each of these challenges. It was demonstrated in a slim-tube injection experiment that it is possible to transport silica nanoparticles over large distances through porous media. The feasibility of magnetic collection of nanoparticles from produced fluid was evaluated experimentally, and it was estimated that 3% of the injected nanoparticles were recovered in a prototype magnetic collection device. An analysis technique was tailored to nanosensors with a dye-release mechanism to estimate temperature measurement geolocation by analyzing the return curve of the released dye. This technique was used in a hypothetical …
Date:
June 15, 2011
Creator:
Ames, Morgan.
Object Type:
Report
System:
The UNT Digital Library
Compact Linear Accelerator Sources for Gamma-ray Generation
None
Date:
June 7, 2011
Creator:
Anderson, S. G.; Barty, C. P.; Beer, G.; Cross, R. R.; Ebbers, C. A.; Gibson, D. J. et al.
Object Type:
Article
System:
The UNT Digital Library
Historic Fishing Methods in American Samoa
Report discussing the historic fishing practices that are common place among American Samoans. Report includes fishing techniques, types of fishing, and variation between villages.
Date:
June 2011
Creator:
Armstrong, Karen; Herdich, David & Levine, Arielle
Object Type:
Report
System:
The UNT Digital Library
[Email from Steve Atkinson to Evans Harris, June 10, 2011]
Email from Steve Atkinson to Evans Harris discussing the GLBT Dallas history project.
Date:
June 10, 2011
Creator:
Atkinson, Steve
Object Type:
Letter
System:
The UNT Digital Library
Oil biodegradation and bioremediation: A tale of the two worst spills in U.S. history
None
Date:
June 1, 2011
Creator:
Atlas, R.M. & Hazen, T.C.
Object Type:
Article
System:
The UNT Digital Library
Measurement of |Vcb| and the Form-Factor Slope in Bbar -> Dlnu Decays in Events Tagged by a Fully Reconstructed B Meson
We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element |V{sub cb}| and the form-factor slope {rho}{sup 2} in {bar B} {yields} D{ell}{sup -} {bar {nu}}{sub {ell}} decays based on 460 million B{bar B} events recorded at the {Gamma}(4S) resonance with the BABAR detector. {bar B} {yields} D{ell}{sup -} {bar {nu}}{sub {ell}} decays are selected in events in which a hadronic decay of the second B meson is fully reconstructed. We measure the differential decay rate and determine G(1)|V{sub cb}| = (43.0 {+-} 1.9 {+-} 1.4) x 10{sup -3} and {rho}{sup 2} = 1.20 {+-}0.09 {+-} 0.04, where G(1) is the hadronic form factor at the point of zero recoil. We also determine the exclusive branching fractions and find {Beta}(B{sup -} {yields} D{sup 0} {ell}{sup -}{bar {nu}}{sub {ell}}) = (2.31 {+-} 0.08 {+-} 0.09)% and {Beta}(B{sup 0} {yields} D{sup +} {ell}{sup -} {bar {nu}}{sub {ell}}) = (2.23 {+-} 0.11 {+-} 0.11)%.
Date:
June 30, 2011
Creator:
Aubert, Bernard; Karyotakis, Y.; Lees, J. P.; Poireau, V.; Prencipe, E.; Prudent, X. et al.
Object Type:
Article
System:
The UNT Digital Library
Measurements of Charged Current Lepton Universality and |Vus| using Tau Lepton Decays to e- v v, __- v v, pi- v and K- v
Using 467 fb{sup -1} of e{sup +}e{sup -} annihilation data collected with the BABAR detector, they measure {Beta}({tau}{sup -} {yields} {mu}{sup -}{bar {nu}}{sub {mu}}{nu}{sub {tau}})/{Beta}({tau}{sup -} {yields} e{sup -} {bar {nu}}{sub e}{nu}{sub {tau}}) = (0.9796 {+-} 0.0016 {+-} 0.0036), {Beta}({tau}{sup -} {yields} {pi}{sup -} {nu}{sub {tau}})/{Beta}({tau}{sup -} {yields} e{sup -}{bar {nu}}{sub e}{nu}{sub {tau}}) = (0.5945 {+-} 0.0014 {+-} 0.0061), and {Beta}({tau}{sup -} {yields} K{sup -}{nu}{sub {tau}})/{Beta}({tau}{sup -} {yields} e{sup -}{bar {nu}}{sub e}{nu}{sub {tau}}) = (0.03882 {+-} 0.00032 {+-} 0.00057), where the uncertainties are statistical and systematic, respectively. From these precision {tau} measurements, they test the Standard Model assumption of {mu}-e and {tau}-{mu} charge current lepton universality and provide determinations of |V{sub us}| experimentally independent of the decay of a kaon.
Date:
June 30, 2011
Creator:
Aubert, Bernard; Karyotakis, Y.; Lees, J. P.; Poireau, V.; Prencipe, E.; Prudent, X. et al.
Object Type:
Article
System:
The UNT Digital Library
The Debt Limit: History and Recent Increases
This report discusses congress and its restrictions on federal debt. It further discusses about the recent economic slowdown that led sharply higher deficits in recent years, which led to series of debt limit increases.
Date:
June 1, 2011
Creator:
Austin, D. Andrew & Levit, Mindy R.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Morton Averack, June 30, 2011
The National Museum of the Pacific War presents an oral interview with Morton Averack. Averack joined the Office of Strategic Services (OSS) at the age of 16, having been recruited from his high school, the School of Aviation in New York, where he had already acquired drafting skills. He and a Japanese-American teenager worked together to map the city of Mukden. The last map of the city had been made in 1933, and the OSS was tasked with updating it as part of its efforts to know the whereabouts of General Wainwright. Averack and his partner worked 17-hour days, sleeping in cots beside their shared drafting board. They were granted a 24-hour leave only once every few weeks. Averack requested aerial photographs of certain areas, and after examining photographs under a stereoscope he would make additions to the map. The work was painstaking and exacting, and mistakes had to be bleached out after being drawn in India ink. After a year-and-a-half, the prisoner-of-war camp was finally located, and Wainwright was rescued. Averack’s work complete, he was discharged in late 1945. Despite never being granted the benefits of the GI Bill, he earned a degree in engineering and enjoyed a varied …
Date:
June 30, 2011
Creator:
Averack, Morton
Object Type:
Text
System:
The Portal to Texas History