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2,310 Matching Results
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Growth of CZT using additionally zone-refined raw materials
N/A
Date:
August 12, 2012
Creator:
A., Bolotnikov; James, Ralph; Knuteson, David J.; Berghmans, Andre; Kahler, David; Wagner, Brian et al.
Object Type:
Article
System:
The UNT Digital Library
Semi-analytical description of the modular section of the coherent electron cooling via integral transforms
N/A
Date:
May 12, 2013
Creator:
A., Elizarov & Litvinenko, V.
Object Type:
Article
System:
The UNT Digital Library
Device and technique for in-situ coating of the RHIC cold bore vacuum tubes with thick OFHC
N/A
Date:
May 12, 2013
Creator:
A., Hershcovitch; Blaskiewicz, M.; Brennan, J. M.; Chawla, A.; Custer, A.; Erickson, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Studies of the Performance of the ATLAS Detector Using Cosmic-Ray Muons
None
Date:
June 12, 2013
Creator:
Aad, G.
Object Type:
Article
System:
The UNT Digital Library
Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at sqrt(S(NN))= 2.76 TeV with the ATLAS Detector at the LHC
None
Date:
June 12, 2013
Creator:
Aad, Georges
Object Type:
Article
System:
The UNT Digital Library
Study of multi-muon events produced in p anti-p interactions at s**(1/2) = 1.96-TeV
We report the results of a study of multi-muon events produced at the Fermilab Tevatron collider and acquired with the CDF II detector using a dedicated dimuon trigger. The production cross section and kinematics of events in which both muon candidates are produced inside the beam pipe of radius 1.5 cm are successfully modeled by known processes which include heavy flavor production. In contrast, we are presently unable to fully account for the number and properties of the remaining events, in which at least one muon candidate is produced outside of the beam pipe, in terms of the same understanding of the CDF II detector, trigger, and event reconstruction.
Date:
June 12, 2010
Creator:
Aaltonen, T.; Phys., /Helsinki Inst. of; Adelman, J.; /Chicago U., EFI; Alvarez Gonzalez, B.; Phys., /Cantabria Inst. of et al.
Object Type:
Article
System:
The UNT Digital Library
Texas Safety Action Report
Report regarding immediate and future actions to improve safety for Texans related to mass shootings and other attacks, and including explanations of relevant executive orders.
Date:
September 12, 2019
Creator:
Abbott, Greg, 1957-
Object Type:
Report
System:
The Portal to Texas History
Boosted Objects: A Probe of Beyond the Standard Model Physics
We present the report of the hadronic working group of the BOOST2010 workshop held at the University of Oxford in June 2010. The first part contains a review of the potential of hadronic decays of highly boosted particles as an aid for discovery at the LHC and a discussion of the status of tools developed to meet the challenge of reconstructing and isolating these topologies. In the second part, we present new results comparing the performance of jet grooming techniques and top tagging algorithms on a common set of benchmark channels. We also study the sensitivity of jet substructure observables to the uncertainties in Monte Carlo predictions.
Date:
June 12, 2012
Creator:
Abdesselam, A.; U., /Oxford; Kuutmann, E.Bergeaas; /DESY; Bitenc, U.; U., /Freiburg et al.
Object Type:
Article
System:
The UNT Digital Library
Detection of a Spectral Break in the Extra Hard Component of GRB 090926A
None
Date:
June 12, 2012
Creator:
Ackermann, M.; Ajello, M.; Asano, K.; Axelsson, M.; Baldini, L.; Ballet, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Predictive Science Panel Unclassified Report, LLNL Meeting
None
Date:
September 12, 2013
Creator:
Adams, M
Object Type:
Report
System:
The UNT Digital Library
Confirmatory Survey Report for the Section 4 Area at the Rio Algom Ambrosia Lake Facility New Mexico
The objectives of the confirmatory survey were to verify that remedial actions were effective in meeting established release criteria and that documentation accurately and adequately described the final radiological conditions of the RAM Ambrosia Lake, Section 4 Areas.
Date:
February 12, 2010
Creator:
Adams, W. C.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of Performance, Reliability, and Risk for High Peak Power RF Sources from S-band through X-band for Advanced Accelerator Applications
None
Date:
December 12, 2012
Creator:
Adolphsen, C.; Jensen, A.; Pearson, C.; Sprehn, D. W.; Vlieks, A. E.; Wang, F. et al.
Object Type:
Article
System:
The UNT Digital Library
A Compact X-Band Linac for an X-Ray FEL
With the growing demand for FEL light sources, cost issues are being reevaluated. To make the machines more compact, higher frequency room temperature linacs are being considered, specifically ones using C-band (5.7 GHz) rf technology, for which 40 MV/m gradients are achievable. In this paper, we show that an X-band (11.4 GHz) linac using the technology developed for NLC/GLC can provide an even lower cost solution. In particular, stable operation is possible at gradients of 100 MV/m for single bunch operation and 70 MV/m for multibunch operation. The concern, of course, is whether the stronger wakefields will lead to unacceptable emittance dilution. However, we show that the small emittances produced in a 250 MeV, low bunch charge, LCLS-like S-band injector and bunch compressor can be preserved in a multi-GeV X-band linac with reasonable alignment tolerances. The successful lasing and operation of the LCLS [1] has generated world-wide interest in X-ray FELs. The demand for access to such a light source by researchers eager to harness the capabilities of this new tool far exceeds the numbers that can be accommodated, spurring plans for additional facilities. Along with cost, spatial considerations become increasingly important for a hard X-ray machine driven by a …
Date:
September 12, 2011
Creator:
Adolphsen, Chris; Huang, Zhirong; Bane, Karl L. F.; Li, Zenghai; Zhou, Feng; Wang, Faya et al.
Object Type:
Article
System:
The UNT Digital Library
Collaborative Research: ARM observations for the development and evaluation of models and parameterizations of cloudy boundary layers
This is a collaborative project with Dr. Ping Zhu at Florida International University. It was designed to address key issues regarding the treatment of boundary layer cloud processes in climate models with UM’s research focusing on the analyses of ARM cloud radar observations from MMCR and WACR and FIU’s research focusing on numerical simulations of boundary layer clouds. This project capitalized on recent advancements in the ARM Millimeter Cloud Radar (MMCR) processing and the development of the WACR (at the SGP) to provide high temporal and spatial resolution Doppler cloud radar measurements for characterizing in-cloud turbulence, large-eddy circulations, and high resolution cloud structures of direct relevance to high resolution numerical modeling studies. The principal focus of the observational component of this collaborative study during this funding period was on stratocumulus clouds over the SGP site and fair-weather cumuli over the Nauru site. The statistical descriptions of the vertical velocity structures in continental stratocumulus clouds and in the Nauru shallow cumuli that are part of this study represents the most comprehensive observations of the vertical velocities in boundary layer clouds to date and were done in collaboration with Drs. Virendra Ghate and Pavlos Kollias.
Date:
July 12, 2013
Creator:
Albrecht, Bruce
Object Type:
Report
System:
The UNT Digital Library
Commissioning of the EBIS-based heavy ion preinjector at Brookhaven
The status is presented of the commissioning of a new heavy ion preinjector at Brookhaven National Laboratory. This preinjector uses an Electron Beam Ion Source (EBIS), and an RFQ and IH Linac, both operating at 100.625 MHz, to produce 2 MeV/u ions of any species for use, after further acceleration, at the Relativistic Heavy Ion Collider (RHIC) and the NASA Space Radiation Laboratory (NSRL). Among the increased capabilities provided by this preinjector are the ability to produce ions of any species, and the ability to switch between multiple species in 1 second, to simultaneously meet the needs of both science programs. For initial setup, helium beam from EBIS was injected and circulated in the Booster synchrotron. Following this, accelerated Au{sup 32+} and Fe{sup 20+} beams were transported to the Booster injection point, fulfilling DOE requirements for project completion.
Date:
September 12, 2010
Creator:
Alessi, J.; Beebe, E.; Binello, S.; Hoff, L.; Kondo, K.; Lambiase, R. et al.
Object Type:
Article
System:
The UNT Digital Library
The Lacey Act: Protecting the Environment by Restricting Trade
This report looks at the history and applications of the Lacey Act. As it stands now the Act, via a 2008 amendment, allows the U.S. to enforce the laws of other countries as well. One currently proposed legislation would limit application of the law to specific wood products, while another would eliminate any reference to violations of foreign laws and end criminal prosecutions for violating the act.
Date:
April 12, 2012
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
Ergonomics in the Biosciences
None
Date:
April 12, 2010
Creator:
Alexandre, Melanie
Object Type:
Report
System:
The UNT Digital Library
It's On: Early Interpretations of ATLAS Results in Jets and Missing Energy
The first search for supersymmetry from ATLAS with 70 nb{sup -1} of integrated luminosity extends the Tevatron's reach for colored particles that decay into jets plus missing transverse energy. For gluinos that decay directly or through a one step cascade into the LSP and two jets, the mass range m{sub {bar g}} {le} 205 GeV is disfavored by the ATLAS searches, regardless of the mass of the LSP. In some cases the coverage extends up to m{sub {bar g}} {approx_equal} 295 GeV, already surpassing the Tevatron's reach for compressed supersymmetry spectra.
Date:
August 12, 2011
Creator:
Alves, Daniele S. M.; Izaguirre, Eder & Wacker, Jay G.
Object Type:
Article
System:
The UNT Digital Library
Poker Face of Inelastic Dark Matter: Prospects at Upcoming Direct Detection Experiments
The XENON100 and CRESST experiments will directly test the inelastic dark matter explanation for DAMA's 8.9{sigma} anomaly. This article discusses how predictions for direct detection experiments depend on uncertainties in quenching factor measurements, the dark matter interaction with the Standard Model and the halo velocity distribution. When these uncertainties are accounted for, an order of magnitude variation is found in the number of expected events at CRESST and XENON100. The process of testing the DAMA anomaly highlights many of the challenges inherent to direct detection experiments. In addition to determining the properties of the unknown dark matter particle, direct detection experiments must also consider the unknown flux of the incident dark matter, as well as uncertainties in converting a signal from one target nucleus to another. The predictions for both the CRESST 2009 run and XENON100 2010 run show an order of magnitude uncertainty. The nuclear form factor for {sup 184}W, when combined with additional theoretical and experimental uncertainties, will likely prevent CRESST from refuting the iDM hypothesis with an exposure of {Omicron}(100 kg-d) in a model-independent manner. XENON100, on the other hand, will be able to make a definitive statement about a spin-independent, inelastically scattering dark matter candidate. Still, …
Date:
August 12, 2011
Creator:
Alves, Daniele S.M.; Lisanti, Mariangela; /SLAC /Stanford U., Phys. Dept.; Wacker, Jay G. & /SLAC
Object Type:
Article
System:
The UNT Digital Library
Demonstration of a 17 cm robust carbon fiber deformable mirror for adaptive optics
Carbon-fiber reinforced polymer (CFRP) composite is an attractive material for fabrication of optics due to its high stiffness-to-weight ratio, robustness, zero coefficient of thermal expansion (CTE), and the ability to replicate multiple optics from the same mandrel. We use 8 and 17 cm prototype CFRP thin-shell deformable mirrors to show that residual CTE variation may be addressed with mounted actuators for a variety of mirror sizes. We present measurements of surface quality at a range of temperatures characteristic of mountaintop observatories. For the 8 cm piece, the figure error of the Al-coated reflective surface under best actuator correction is {approx}43 nm RMS. The 8 cm mirror has a low surface error internal to the outer ring of actuators (17 nm RMS at 20 C and 33 nm RMS at -5 C). Surface roughness is low (< 3 nm P-V) at a variety of temperatures. We present new figure quality measurements of the larger 17 cm mirror, showing that the intra-actuator figure error internal to the outer ring of actuators (38 nm RMS surface with one-third the actuator density of the 8 cm mirror) does not scale sharply with mirror diameter.
Date:
September 12, 2011
Creator:
Ammons, S. M.; Hart, M.; Coughenour, B.; Romeo, R.; Martin, R. & Rademacher, M.
Object Type:
Article
System:
The UNT Digital Library
Wind prediction with multiple guide stars reduces tomographic errors and expands MOAO field of regard
None
Date:
July 12, 2012
Creator:
Ammons, S. M.; Poyneer, L.; Gavel, D.; Kupke, R.; Max, C. E. & Johnson, L.
Object Type:
Article
System:
The UNT Digital Library
Microarcsecond relative astrometry from the ground with a diffractive pupil
None
Date:
July 12, 2012
Creator:
Ammons, S. Mark; Bendek, Eduardo A.; Guyon, Olivier; Macintosh, Bruce & Savransky, Dmitry
Object Type:
Article
System:
The UNT Digital Library
Two-Dimensional Dirac Fermions in a Topological Insulator: Transport in the Quantum Limit
Pulsed magnetic fields of up to 55T are used to investigate the transport properties of the topological insulator Bi{sub 2}Se{sub 3} in the extreme quantum limit. For samples with a bulk carrier density of n = 2.9 x 10{sup 16} cm{sup -3}, the lowest Landau level of the bulk 3D Fermi surface is reached by a field of 4T. For fields well beyond this limit, Shubnikov-de Haas oscillations arising from quantization of the 2D surface state are observed, with the {nu} = 1 Landau level attained by a field of {approx} 35T. These measurements reveal the presence of additional oscillations which occur at fields corresponding to simple rational fractions of the integer Landau indices.
Date:
August 12, 2011
Creator:
Analytis, J. G.; McDonald, R. D.; Riggs, S. C.; Chu, J.-H.; Boebinger, G. S. & Fisher, I. R.
Object Type:
Article
System:
The UNT Digital Library
Nuclear Power Plant Design and Seismic Safety Considerations
This report presents some of the general design concepts of operating nuclear power plants in order to discuss design considerations for seismic events. This report does not attempt to conclude whether one design is inherently safer or less safe than another plant. Nor does it attempt to conclude whether operating nuclear power plants are at any greater or lesser risk from earthquakes given recent updates to seismic data and seismic hazard maps.
Date:
January 12, 2012
Creator:
Andrews, Anthony & Folger, Peter
Object Type:
Report
System:
The UNT Digital Library