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2,284 Matching Results
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Measurement of Inclusive Jet And Dijet Cross Sections in Proton-Proton Collisions at 7 TeV Centre-Of-Mass Energy with the ATLAS Detector
None
Date:
June 17, 2013
Creator:
Aad, G.
Object Type:
Article
System:
The UNT Digital Library
The On-Orbit Calibrations for the Fermi Large Area Telescope
The Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope began its on-orbit operations on June 23, 2008. Calibrations, defined in a generic sense, correspond to synchronization of trigger signals, optimization of delays for latching data, determination of detector thresholds, gains and responses, evaluation of the perimeter of the South Atlantic Anomaly (SAA), measurements of live time, of absolute time, and internal and spacecraft boresight alignments. Here we describe on-orbit calibration results obtained using known astrophysical sources, galactic cosmic rays, and charge injection into the front-end electronics of each detector. Instrument response functions will be described in a separate publication. This paper demonstrates the stability of calibrations and describes minor changes observed since launch. These results have been used to calibrate the LAT datasets to be publicly released in August 2009.
Date:
November 17, 2011
Creator:
Abdo, Aous A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. et al.
Object Type:
Article
System:
The UNT Digital Library
Pulsed Gamma-Rays From the Millisecond Pulsar J0030+0451 with the Fermi Large Area Telescope
We report the discovery of gamma-ray pulsations from the nearby isolated millisecond pulsar PSR J0030+0451 with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST). This discovery makes PSR J0030+0451 the second millisecond pulsar to be detected in gamma-rays after PSR J0218+4232, observed by the EGRET instrument on the Compton Gamma Ray Observatory. The spin-down power {dot E} = 3.5 x 10{sup 33} ergs s{sup -1} is an order of magnitude lower than the empirical lower bound of previously known gamma-ray pulsars. The emission profile is characterized by two narrow peaks, respectively 0.07 {+-} 0.01 and 0.08 {+-} 0.02 wide, separated by 0.44 {+-} 0.02 in phase. The first gamma-ray peak falls 0.15 {+-} 0.01 after the main radio peak. The pulse shape is similar to that of the 'normal' gamma-ray pulsars. An exponentially cut-off power-law fit of the emission spectrum leads to an integral photon flux above 100 MeV of (6.76 {+-} 1.05 {+-} 1.35) x 10{sup -8} cm{sup -2} s{sup -1} with cut-off energy (1.7 {+-} 0.4 {+-} 0.5) GeV. Based on its parallax distance of (300 {+-} 90) pc, we obtain a gamma-ray efficiency L{sub {gamma}}/{dot E} {approx_equal} 15% for the conversion of …
Date:
November 17, 2011
Creator:
Abdo, Aous A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Atwood, W.B.; /UC, Santa Cruz et al.
Object Type:
Article
System:
The UNT Digital Library
Forward Instrumentation for ILC Detectors
None
Date:
June 17, 2013
Creator:
Abramowicz, H.; Abusleme, A.; Afanaciev, K.; Aguilar, J.; Ambalathankandy, P.; Bambade, P. et al.
Object Type:
Article
System:
The UNT Digital Library
Normal Conducting Radio Frequency X-Band Deflecting Cavity Fabrication and Validation
None
Date:
October 17, 2013
Creator:
Agustsson, R.; Faillace, L.; Murokh, A.; Storms, S.; Rosenzweig, J.; Alesini, D. et al.
Object Type:
Article
System:
The UNT Digital Library
U.S.-EU Trade and Economic Relations: Key Policy Issues for the 112th Congress
This report examines the trade relations between the United States, the European Union, and China.
Date:
February 17, 2011
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
The Future of the Eurozone and U.S. Interests
Seventeen of the European Union's 27 member states share an economic and monetary union (EMU) with the euro as a single currency. These countries are effectively referred to as the Eurozone. What has become known as the Eurozone crisis began in early 2010 when financial markets were shaken by heightened concerns that the fiscal positions of a number of Eurozone countries, beginning with Greece, were unsustainable. This report provides background information and analysis on the future of the Eurozone in six parts, including discussions on the origins and design challenges of the Eurozone, proposals to define the Eurozone crisis, possible scenarios for the future of the Eurozone, and the implications of the Eurozone crisis for U.S. economic and political interests.
Date:
January 17, 2012
Creator:
Ahearn, Raymond J.; Jackson, James K.; Mix, Derek E. & Nelson, Rebecca M.
Object Type:
Report
System:
The UNT Digital Library
Limits on Large Extra Dimensions Based on Observations of Neutron Stars with the Fermi-LAT
We present limits for the compactification scale in the theory of Large Extra Dimensions (LED) proposed by Arkani-Hamed, Dimopoulos, and Dvali. We use 11 months of data from the Fermi Large Area Telescope (Fermi-LAT) to set gamma ray flux limits for 6 gamma-ray faint neutron stars (NS). To set limits on LED we use the model of Hannestad and Raffelt (HR) that calculates the Kaluza-Klein (KK) graviton production in supernova cores and the large fraction subsequently gravitationally bound around the resulting NS. The predicted decay of the bound KK gravitons to {gamma}{gamma} should contribute to the flux from NSs. Considering 2 to 7 extra dimensions of the same size in the context of the HR model, we use Monte Carlo techniques to calculate the expected differential flux of gamma-rays arising from these KK gravitons, including the effects of the age of the NS, graviton orbit, and absorption of gamma-rays in the magnetosphere of the NS. We compare our Monte Carlo-based differential flux to the experimental differential flux using maximum likelihood techniques to obtain our limits on LED. Our limits are more restrictive than past EGRET-based optimistic limits that do not include these important corrections. Additionally, our limits are more stringent …
Date:
August 17, 2012
Creator:
Ajello, M.; Baldini, L.; Barbiellini, G.; Bastieri, D.; Bechtol, K.; Bellazzini, R. et al.
Object Type:
Article
System:
The UNT Digital Library
Compton scattering sources and applications at LLNL
None
Date:
August 17, 2010
Creator:
Albert, F.; Anderson, S. G.; Anderson, G.; Bayramian, A.; Betts, S. M.; Cross, R. R. et al.
Object Type:
Article
System:
The UNT Digital Library
PSEC Fast Timing Test
None
Date:
June 17, 2013
Creator:
Albrow, Michael; Ramberg, Erik; Ronzhin, Anatoly; Ertley, Camden; Frsich, Henry; Genat, Jean-Francois et al.
Object Type:
Report
System:
The UNT Digital Library
Gray Wolves Under the Endangered Species Act (ESA): Distinct Population Segments and Experimental Populations
This report analyzes the Endangered Species Act (ESA) as it applies to gray wolf wolves and, in particular, to their treatment as experimental populations (Ex Pops) and distinct population segments (DPSs).
Date:
August 17, 2011
Creator:
Alexander, Kristina & Corn, M. L.
Object Type:
Report
System:
The UNT Digital Library
ESTIMATING IMPURITIES IN SURPLUS PLUTONIUM FOR DISPOSITION
The United States holds at least 61.5 metric tons (MT) of plutonium that is permanently excess to use in nuclear weapons programs, including 47.2 MT of weapons-grade plutonium. Surplus inventories will be stored safely by the Department of Energy (DOE) and then transferred to facilities that will prepare the plutonium for permanent disposition. The Savannah River National Laboratory (SRNL) operates a Feed Characterization program for the Office of Fissile Materials Disposition of the National Nuclear Security Administration and the DOE Office of Environmental Management. Many of the items that require disposition are only partially characterized, and SRNL uses a variety of techniques to predict the isotopic and chemical properties that are important for processing through the Mixed Oxide Fuel Fabrication Facility and alternative disposition paths. Recent advances in laboratory tools, including Prompt Gamma Analysis and Peroxide Fusion treatment, provide data on the existing inventories that will enable disposition without additional, costly sampling and destructive analysis.
Date:
July 17, 2013
Creator:
Allender, J. & Moore, E.
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
Renewable Energy Certificate Program
This project was primarily to develop and implement a curriculum which will train undergraduate and graduate students at the University seeking a degree as well as training for enrollees in a special certification program to prepare individuals to be employed in a broad range of occupations in the field of renewable energy and energy conservation. Curriculum development was by teams of Saint Francis University Faculty in the Business Administration and Science Departments and industry experts. Students seeking undergraduate and graduate degrees are able to enroll in courses offered within these departments which will combine theory and hands-on training in the various elements of wind power development. For example, the business department curriculum areas include economic modeling, finance, contracting, etc. The science areas include meteorology, energy conversion and projection, species identification, habitat protection, field data collection and analysis, etc.
Date:
July 17, 2012
Creator:
Andersen, Gwendolyn S.
Object Type:
Report
System:
The UNT Digital Library
Integrated Genome-Based Studies of Shewanella Ecophysiology
Integration of bioinformatics and experimental techniques was applied to mapping and characterization of the key components (pathways, enzymes, transporters, regulators) of the core metabolic machinery in Shewanella oneidensis and related species with main focus was on metabolic and regulatory pathways involved in utilization of various carbon and energy sources. Among the main accomplishments reflected in ten joint publications with other participants of Shewanella Federation are: (i) A systems-level reconstruction of carbohydrate utilization pathways in the genus of Shewanella (19 species). This analysis yielded reconstruction of 18 sugar utilization pathways including 10 novel pathway variants and prediction of > 60 novel protein families of enzymes, transporters and regulators involved in these pathways. Selected functional predictions were verified by focused biochemical and genetic experiments. Observed growth phenotypes were consistent with bioinformatic predictions providing strong validation of the technology and (ii) Global genomic reconstruction of transcriptional regulons in 16 Shewanella genomes. The inferred regulatory network includes 82 transcription factors, 8 riboswitches and 6 translational attenuators. Of those, 45 regulons were inferred directly from the genome context analysis, whereas others were propagated from previously characterized regulons in other species. Selected regulatory predictions were experimentally tested. Integration of this analysis with microarray data revealed overall …
Date:
December 17, 2012
Creator:
Andrei L. Osterman, Ph.D.
Object Type:
Report
System:
The UNT Digital Library
The First Development of an EPICS Control System for the IAC Accelerators
None
Date:
October 17, 2013
Creator:
Andrews, Anthony; Kim, Y.; Eckman, C.; Hunt, A.; Wells, D. & Kim, K.
Object Type:
Article
System:
The UNT Digital Library
U.S. Farm Commodity Support: An Overview of Selected Programs
This report provides an overview of federal farm commodity support programs administered by the U.S. Department of Agriculture (USDA) and possible issues for Congress to consider regarding them.
Date:
April 17, 2018
Creator:
Angadjivand, Sahar
Object Type:
Report
System:
The UNT Digital Library
Europe’s Migration Crisis
None
Date:
July 17, 2015
Creator:
Archick, Kristin & Margesson, Rhoda
Object Type:
Report
System:
The UNT Digital Library
Temporary Protected Status: Current Immigration Policy and Issues
This report is a brief overview of current policies regarding temporary protected status (TPS), which is relief from removal under the Immigration and Nationality Act (INA). It includes information about humanitarian migrants, temporary protected status, other blanket forms of relief, nationalities receiving protections, and issues with TPS, as well as recent legislation.
Date:
January 17, 2017
Creator:
Argueta, Carla N.
Object Type:
Report
System:
The UNT Digital Library
Auction-Rate Securities
This report discusses auction-rate securities (ARSs), which most are long-term bonds, although some ARS are structured as preferred shares and so have no maturities.
Date:
July 17, 2012
Creator:
Austin, D. Andrew
Object Type:
Report
System:
The UNT Digital Library
Circular A-76 and the Moratorium on DOD Competitions: Background and Issues for Congress
This report discusses the current moratorium on the conduct of Department of Defense (DOD) public-private competitions under Office of Management and Budget (OMB) Circular A-76 and issues for Congress.
Date:
January 17, 2012
Creator:
Bailey Grasso, Valerie
Object Type:
Report
System:
The UNT Digital Library
Wakefield Calculations for the LCLS in Multbunch Operation
Normally the Linac Coherent Light Source (LCLS) operates in single-bunch mode, sending a bunch of up to 250 pC charge at 120 Hz through the linac and the undulator, and the resulting FEL radiation into one of the experimental hutches. With two bunches per rf pulse, each pulse could feed either two experiments or one experiment in a pump-probe type configuration. Two-bunch FEL operation has already been briefly tested at the LCLS, and works reasonably well, although not yet routinely. In this report we study the longitudinal and transverse long-range (bunch-to-bunch) wakefields of the linacs and their effects on LCLS performance in two-bunch mode, which is initially the most likely scenario. The longitudinal wake changes the average energy at the second bunch, and the transverse wake misaligns the second bunch (in transverse phase space) in the presence of e.g. transverse injection jitter or quad misalignments. Finally, we extend the study to consider the LCLS with trains of up to 20 bunches per rf pulse. In the LCLS the bunch is created in an rf gun, and then passes in sequence through Linac 0, Linac 1, Linac X, Bunch Compressor 1 (BC 1), Linac 2, BC 2, Linac 3, and finally …
Date:
October 17, 2011
Creator:
Bane, K.
Object Type:
Article
System:
The UNT Digital Library
Estimates of Power Radiated by the Beam in Bends of LCLS-II
None
Date:
December 17, 2013
Creator:
Bane, K. L. F. & Emma, P.
Object Type:
Report
System:
The UNT Digital Library
B to tau Leptonic and Semileptonic Decays
Decays of B mesons to states involving {tau} leptons can be used as a tool to search for the effects of new physics, such as those involving a charged Higgs boson. The experimental status of the decays B {yields} {tau}{nu} and B {yields} D{sup (*)}{tau}{nu} is discussed, together with limits on new physics effects from current results. Leptonic and semileptonic decays of B mesons into states involving {tau} leptons remain experimentally challenging, but can prove a useful tool for constraining Standard Model parameters, and also offer to constrain the effects of any new physics that may exist including the presence of a charged Higgs boson.
Date:
November 17, 2011
Creator:
Barrett, M. & U., /Brunel
Object Type:
Article
System:
The UNT Digital Library