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664 Matching Results
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Savannah River Ecology Laboratory FY2006 Annual Technical Progress Report
FY2006 annual report of research conducted by the Savannah River Ecology Laboratory, a research unit of the University of Georgia operating on the Savannah River Site in Aiken, County, SC.
Date:
October 23, 2006
Creator:
Bertsch, Paul M.
Object Type:
Report
System:
The UNT Digital Library
Factors influencing timing resolution in a commercial LSO PETcamera
The CPS Accel is a commercial PET camera based on a block detector with 64 LSO scintillator crystals (each 6.75 x 6.75 x 25 mm)read out with 4 photomultiplier tubes. The excellent timing resolution of LSO suggests that this camera might be used for time-of-flight (TOF) PET, thereby reducing the statistical noise significantly. Although the Accel achieves 3 ns coincidence resolution (a factor of two better than BGO-based PET cameras), its timing resolution is nearly an order of magnitude worse than that demonstrated with individual LSO crystals. This paper quantifies the effect on the timing of each component in the Accel timing chain to identify which components most limit the camera's timing resolution. The components in the timing chain are: the scintillator crystal, the photomultiplier tube (PMT), the constant fraction discriminator (CFD), and the time to digital converter (TDC). To measure the contribution of each component, we construct a single crystal test system with high-performance versions of these components. This system achieves 221 ps fwhm coincidence timing resolution, which is used as a baseline measurement. One of the high-performance components is replaced by a production component, the coincidence timing resolution is re-measured, and the difference between measurements is the contribution …
Date:
October 23, 2004
Creator:
Moses, William W. & Ullisch, Marcus
Object Type:
Article
System:
The UNT Digital Library
PERFORMANCE TESTING OF SPRING ENERGIZED C-RINGS FOR USE IN RADIOACTIVE MATERIAL PACKAGINGS CONTAINING TRITIUM
This paper describes the sealing performance testing and results of silver-plated inconel Spring Energized C-Rings used for tritium containment in radioactive shipping packagings. The test methodology used follows requirements of the American Society of Mechanical Engineers (ASME) summarized in ASME Pressure Vessel Code (B&PVC), Section V, Article 10, Appendix IX (Helium Mass Spectrometer Test - Hood Technique) and recommendations by the American National Standards Institute (ANSI) described in ANSI N14.5-1997. The tests parameters bound the predicted structural and thermal responses from conditions defined in the Code of Federal Regulations 10 CFR 71. The testing includes an evaluation of the effects of pressure, temperature, flange deflection, surface roughness, permeation, closure torque, torque sequencing and re-use on performance of metal C-Ring seals.
Date:
October 23, 2007
Creator:
Blanton, P & Kurt Eberl, K
Object Type:
Article
System:
The UNT Digital Library
Development of a Generator to Power ATP-Driven Molecular Motors
Here, we report a maximum ATP synthesis rate of 193 nmol/min/mg for thermophilic F{sub 1}F{sub 0}. This rate is somewhat lower than the previously observed maximum rate of 500-700 nmol/min/mg (Pitard et al., 1996). However, ATP synthesis rates vary considerably with experimental conditions, and our observed rates compare favorably with the wide range of rates (40-700 nmol/min/mg) observed by these authors. Future research will focus on maximizing the ATP synthesis rate by adjusting environmental conditions, including the lipid and cholesterol composition of the proteoliposomes.
Date:
October 23, 2002
Creator:
Montemagno, Carlo
Object Type:
Report
System:
The UNT Digital Library
Subcycle Dynamics in the Laser Ionization of Molecules
The time and momentum distributions of electron emission from a molecule during a single laser cycle are calculated by solving a two-dimensional time-dependent Schr{umlt o}dinger equation. The momentum distributions strongly depend on the orbital symmetry and orientation of the molecular axis. Field-induced internal dynamics of the molecule can shift electron emission and recollision times through a large part of the laser cycle, which leads to corresponding variations of high-harmonic emission times and to the appearance of even harmonics.
Date:
October 23, 2007
Creator:
Xie, X. H.; Wickenhauser, M.; Boutu, W.; Merdji, H.; Salieres, P. & Scrinzi, A.
Object Type:
Article
System:
The UNT Digital Library
Extremely Fast Acceleration of Cosmic Rays in a Supernova Remnant
Galactic cosmic rays (CRs) are widely believed to be accelerated by shock waves associated with the expansion of supernova ejecta into the interstellar medium. A key issue in this long-standing conjecture is a theoretical prediction that the interstellar magnetic field can be substantially amplified at the shock of a young supernova remnant (SNR) through magnetohydrodynamic waves generated by cosmic rays. Here we report a discovery of the brightening and decay of X-ray hot spots in the shell of theSNRRXJ1713.723946 on a one-year timescale. This rapid variability shows that the X-rays are produced by ultrarelativistic electrons through a synchrotron process and that electron acceleration does indeed take place in a strongly magnetized environment, indicating amplification of the magnetic field by a factor of more than 100. The X-ray variability also implies that we have witnessed the ongoing shock-acceleration of electrons in real time. Independently, broadband X-ray spectrometric measurements of RXJ1713.723946 indicate that electron acceleration proceeds in the most effective ('Bohm-diffusion') regime. Taken together, these two results provide a strong argument for acceleration of protons and nuclei to energies of 1 PeV (10{sup 15} eV) and beyond in young supernova remnants.
Date:
October 23, 2007
Creator:
Uchiyama, Y.; Aharonian, F. A.; Tanaka, T.; Takahashi, T. & Maeda, Y.
Object Type:
Article
System:
The UNT Digital Library
Recommendations for Addressing Axial Burnup in the PWR Burnup Credit Analyses
This report presents studies performed to support the development of a technically justifiable approach for addressing the axial-burnup distribution in pressurized-water reactor (PWR) burnup-credit criticality safety analyses. The effect of the axial-burnup distribution on reactivity and proposed approaches for addressing the axial-burnup distribution are briefly reviewed. A publicly available database of profiles is examined in detail to identify profiles that maximize the neutron multiplication factor, k{sub eff}, assess its adequacy for PWR burnup credit analyses, and investigate the existence of trends with fuel type and/or reactor operations. A statistical evaluation of the k{sub eff} values associated with the profiles in the axial-burnup-profile database was performed, and the most reactive (bounding) profiles were identified as statistical outliers. The impact of these bounding profiles on k{sub eff} is quantified for a high-density burnup credit cask. Analyses are also presented to quantify the potential reactivity consequence of loading assemblies with axial-burnup profiles that are not bounded by the database. The report concludes with a discussion on the issues for consideration and recommendations for addressing axial burnup in criticality safety analyses using burnup credit for dry cask storage and transportation.
Date:
October 23, 2002
Creator:
Wagner, J. C.
Object Type:
Report
System:
The UNT Digital Library
Final Report: Closeout of the Award NO. DE-FG02-98ER62618 (M.S. Fox-Rabinovitz, P.I.)
The final report describes the study aimed at exploring the variable-resolution stretched-grid (SG) approach to decadal regional climate modeling using advanced numerical techniques. The obtained results have shown that variable-resolution SG-GCMs using stretched grids with fine resolution over the area(s) of interest, is a viable established approach to regional climate modeling. The developed SG-GCMs have been extensively used for regional climate experimentation. The SG-GCM simulations are aimed at studying the U.S. regional climate variability with an emphasis on studying anomalous summer climate events, the U.S. droughts and floods.
Date:
October 23, 2006
Creator:
Fox-Rabinovitz, M. S.
Object Type:
Report
System:
The UNT Digital Library
The Wylie News (Wylie, Tex.), Vol. 55, No. 22, Ed. 1 Wednesday, October 23, 2002
Weekly newspaper from Wylie, Texas that includes local, state and national news along with advertising.
Date:
October 23, 2002
Creator:
Engbrock, Chad B.
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 43, Ed. 1 Thursday, October 23, 2008
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
October 23, 2008
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
Cooper Review (Cooper, Tex.), Vol. 123, No. 43, Ed. 1 Thursday, October 23, 2003
Weekly newspaper from Cooper, Texas that includes local, state, and national news along with advertising.
Date:
October 23, 2003
Creator:
Pinson, Beth
Object Type:
Newspaper
System:
The Portal to Texas History
Lexington Observer (Lexington, Okla.), Vol. 13, No. 29, Ed. 1 Thursday, October 23, 2008
Weekly newspaper from Lexington, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 23, 2008
Creator:
Edwards, Olvis
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Comanche Chief (Comanche, Tex.), No. 26, Ed. 1 Thursday, October 23, 2008
Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.
Date:
October 23, 2008
Creator:
Wilkerson, James C., III
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 43, Ed. 1 Thursday, October 23, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
October 23, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Rains County Leader (Emory, Tex.), Vol. 114, No. 20, Ed. 1 Tuesday, October 23, 2001
Weekly newspaper from Emory, Texas that includes local, state, and national news along with advertising.
Date:
October 23, 2001
Creator:
Hill, Earl Clyde, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 121, No. 85, Ed. 1 Thursday, October 23, 2003
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
October 23, 2003
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
[Vincent Cook Performing on Stage]
Photograph taken of Vincent Cook performing in a boxing ring on stage.
Date:
[2009-10-23..2009-10-24]
Creator:
Dukes, Kevin
Object Type:
Photograph
System:
The UNT Digital Library
[Vincent Cook Performing on Stage]
Photograph taken of Vincent Cook holding his hands towards his face on stage.
Date:
[2009-10-23..2009-10-24]
Creator:
Dukes, Kevin
Object Type:
Photograph
System:
The UNT Digital Library
Limits on a muon flux from Kaluza-Klein dark matter annihilations in the Sun from the IceCube 22-string detector
A search for muon neutrinos from Kaluza-Klein dark matter annihilations in the Sun has been performed with the 22-string configuration of the IceCube neutrino detector using data collected in 104.3 days of live-time in 2007. No excess over the expected atmospheric background has been observed. Upper limits have been obtained on the annihilation rate of captured lightest Kaluza-Klein particle (LKP) WIMPs in the Sun and converted to limits on the LKP-proton cross-sections for LKP masses in the range 250 - 3000 GeV. These results are the most stringent limits to date on LKP annihilation in the Sun.
Date:
October 23, 2009
Creator:
Collaboration, IceCube; Abbasi, R. & al., et
Object Type:
Article
System:
The UNT Digital Library
Neutral Pion Production in Au+Au Collisions at sqrt sNN = 200 GeV
The results of mid-rapidity (0 < y < 0.8) neutral pion spectra over an extended transverse momentum range (1 < p{sub T} < 12 GeV/c) in {radical}s{sub NN} = 200 GeV Au+Au collisions, measured by the STAR experiment, are presented. The neutral pions are reconstructed from photons measured either by the STAR Barrel Electro-Magnetic Calorimeter (BEMC) or by the Time Projection Chamber (TPC) via tracking of conversion electron-positron pairs. Our measurements are compared to previously published {pi}{sup {+-}} and {pi}{sup 0} results. The nuclear modification factors R{sub CP} and R{sub AA} of {pi}{sup 0} are also presented as a function of p{sub T}. In the most central Au+Au collisions, the binary collision scaled {pi}{sup 0} yield at high p{sub T} is suppressed by a factor of about 5 compared to the expectation from the yield of p+p collisions. Such a large suppression is in agreement with previous observations for light quark mesons and is consistent with the scenario that partons suffer considerable energy loss in the dense medium formed in central nucleus-nucleus collisions at RHIC.
Date:
October 23, 2009
Creator:
STAR Collaboration
Object Type:
Article
System:
The UNT Digital Library
RECONSTRUCTION OF DOSE TO THE RESIDENTS OF OZERSK FROM THE OPERATION OF THE MAYAK PRODUCTION ASSOCIATION: 1948-2002: Progress Report on Project 1.4
This Progress Report for Project 1.4 of the U.S.–Russia Joint Coordinating Committee on Radiation Effects Research continues in the abbreviated format of providing details only on the work accomplished during this six-month reporting period.
Date:
October 23, 2009
Creator:
Mokrov, Y.; Rovny, Sergey I.; Anspaugh, L. R. & Napier, Bruce A.
Object Type:
Report
System:
The UNT Digital Library
[Vincent Cook Posing with Unidentified Man]
Photograph taken of Vincent Cook posing with an unidentified person.
Date:
[2009-10-23..2009-10-24]
Creator:
Dukes, Kevin
Object Type:
Photograph
System:
The UNT Digital Library
[Vincent Cook Performing on Stage]
Photograph taken of Vincent Cook performing on stage.
Date:
[2009-10-23..2009-10-24]
Creator:
Dukes, Kevin
Object Type:
Photograph
System:
The UNT Digital Library
[Vincent Cook Performing on Stage]
Photograph taken of Vincent Cook performing inside a boxing ring on stage.
Date:
[2009-10-23..2009-10-24]
Creator:
Dukes, Kevin
Object Type:
Photograph
System:
The UNT Digital Library