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557 Matching Results
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Use of inelastic analysis in cask design
In this paper, the advantages and disadvantages of inelastic analysis are discussed. Example calculations and designs showing the implications and significance of factors affecting inelastic analysis are given. From the results described in this paper it can be seen that inelastic analysis provides an improved method for the design of casks. It can also be seen that additional code and standards work is needed to give designers guidance in the use of inelastic analysis. Development of these codes and standards is an area where there is a definite need for additional work. The authors hope that this paper will help to define the areas where that need is most acute.
Date:
May 15, 2000
Creator:
AMMERMAN,DOUGLAS J. & BREIVIK,NICOLE L.
Object Type:
Article
System:
The UNT Digital Library
ALARA Analysis of Radiological Control Criteria Associated with Alternatives for Disposal of Hazardous Wastes
This ALARA analysis of Radiological Control Criteria (RCC) considers alternatives to continued storage of certain DOE mixed wastes. It also considers the option of treating hazardous wastes generated by DOE facilities, which have a very low concentration of radionuclide contaminants, as purely hazardous waste. Alternative allowable contaminant levels examined correspond to doses to an individual ranging from 0.01 mrem/yr to 10 to 20 mrem/yr. Generic waste inventory data and radionuclide source terms are used in the assessment. Economic issues, potential health and safety issues, and qualitative factors relating to the use of RCCs are considered.
Date:
May 15, 2002
Creator:
Aaberg, Rosanne L.; Bilyard, Gordon R.; Branch, Kristi M.; Lavender, Jay C. & Miller, Peter L.
Object Type:
Report
System:
The UNT Digital Library
Fermi LAT Observations of the Vela Pulsar
None
Date:
May 15, 2009
Creator:
Abdo, Aous A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /SLAC; Atwood, W.B.; /UC, Santa Cruz et al.
Object Type:
Article
System:
The UNT Digital Library
Fermi Discovery of Gamma-Ray Emission from NGC 1275
We report the discovery of high-energy (E > 100 MeV) {gamma}-ray emission from NGC 1275, a giant elliptical galaxy lying at the center of the Perseus cluster of galaxies, based on observations made with the Large Area Telescope (LAT) of the Fermi Gamma-ray Space Telescope. The positional center of the {gamma}-ray source is only {approx}3{prime} away from the NGC 1275 nucleus, well within the 95% LAT error circle of {approx}5{prime}. The spatial distribution of {gamma}-ray photons is consistent with a point source. The average flux and power-law photon index measured with the LAT from 2008 August 4 to 2008 December 5 are F{sub {gamma}} = (2.10 {+-} 0.23) x 10{sup -7} ph (>100 MeV) cm{sup -2} s{sup -1} and {Gamma} = 2.17 {+-} 0.05, respectively. The measurements are statistically consistent with constant flux during the four-month LAT observing period. Previous EGRET observations gave an upper limit of F{sub {gamma}} < 3.72 x 10{sup -8} ph (>100 MeV) cm{sup -2} s{sup -1} to the {gamma}-ray flux from NGC 1275. This indicates that the source is variable on timescales of years to decades, and therefore restricts the fraction of emission that can be produced in extended regions of the galaxy cluster. Contemporaneous …
Date:
May 15, 2009
Creator:
Abdo, Aous A.; Ackermann, M.; Ajello, M.; Asano, K.; Baldini, L.; Ballet, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Fermi Large Area Telescope Bright Gamma-ray Source List
Following its launch in 2008 June, the Fermi Gamma-ray Space Telescope (Fermi) began a sky survey in August. The Large Area Telescope (LAT) on Fermi in three months produced a deeper and better resolved map of the {gamma}-ray sky than any previous space mission. We present here initial results for energies above 100 MeV for the 205 most significant (statistical significance greater than {approx}10{sigma}) {gamma}-ray sources in these data. These are the best characterized and best localized point-like (i.e., spatially unresolved) {gamma}-ray sources in the early mission data.
Date:
May 15, 2009
Creator:
Abdo, Aous A.; Ackermann, M.; Ajello, M.; Atwood, W. B.; Axelsson, M.; Baldini, L. et al.
Object Type:
Article
System:
The UNT Digital Library
Bright AGN Source List from the First Three Months of the Fermi Large Area Telescope All-Sky Survey
None
Date:
May 15, 2009
Creator:
Abdo, Aous A.; Ackermann, M.; Ajello, M.; Atwood, W.B.; Axelsson, M.; Baldini, L. et al.
Object Type:
Article
System:
The UNT Digital Library
Fermi/LAT Discovery of Gamma-Ray Emission From the Flat-Spectrum Radio Quasar PKS 1454-354
None
Date:
May 15, 2009
Creator:
Abdo, Aous A.; Ackermann, M.; Atwood, W. B.; Axelsson, M.; Baldini, L.; Ballet, J. et al.
Object Type:
Article
System:
The UNT Digital Library
The Fermi Gamma Ray Space Telescope discovers the Pulsar in the Young Galactic Supernova-Remnant CTA 1
Energetic young pulsars and expanding blast waves (supernova remnants, SNRs) are the most visible remains after massive stars, ending their lives, explode in core-collapse supernovae. The Fermi Gamma-Ray Space Telescope has unveiled a radio quiet pulsar located near the center of the compact synchrotron nebula inside the supernova remnant CTA 1. The pulsar, discovered through its gamma-ray pulsations, has a period of 316.86 ms, a period derivative of 3.614 x 10{sup -13} s s{sup -1}. Its characteristic age of 10{sup 4} years is comparable to that estimated for the SNR. It is conjectured that most unidentified Galactic gamma ray sources associated with star-forming regions and SNRs are such young pulsars.
Date:
May 15, 2009
Creator:
Abdo, Aous A.; Ackermann, M.; Atwood, W.B.; Baldini, L.; Ballet, J.; Barbiellini, G. et al.
Object Type:
Article
System:
The UNT Digital Library
Discovery of Pulsed Gamma Rays from the Young Radio Pulsar PSR J1028-5819 with the Fermi Large Area Telescope
Radio pulsar PSR J1028-5819 was recently discovered in a high-frequency search (at 3.1 GHz) in the error circle of the Energetic Gamma-Ray Experiment Telescope (EGRET) source 3EG J1027-5817. The spin-down power of this young pulsar is great enough to make it very likely the counterpart for the EGRET source. We report here the discovery of {gamma}-ray pulsations from PSR J1028-5819 in early observations by the Large Area Telescope (LAT) on the Fermi Gamma-Ray Space Telescope. The {gamma}-ray light curve shows two sharp peaks having phase separation of 0.460 {+-} 0.004, trailing the very narrow radio pulse by 0.200 {+-} 0.003 in phase, very similar to that of other known {gamma}-ray pulsars. The measured {gamma}-ray flux gives an efficiency for the pulsar of {approx}10-20% (for outer magnetosphere beam models). No evidence of a surrounding pulsar wind nebula is seen in the current Fermi data but limits on associated emission are weak because the source lies in a crowded region with high background emission. However, the improved angular resolution afforded by the LAT enables the disentanglement of the previous COS-B and EGRET source detections into at least two distinct sources, one of which is now identified as PSR J1028-5819.
Date:
May 15, 2009
Creator:
Abdo, Aous A.; Ackermann, M.; Atwood, W.B.; Baldini, L.; Ballet, J.; Barbiellini, Guido et al.
Object Type:
Article
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 20, Ed. 1 Thursday, May 15, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
May 15, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Tests and Calibration of the NIF Neutron Time of Flight Detectors
The National Ignition Facility (NIF) Neutron Time of Flight (NTOF) diagnostic will measure neutron yield and ion temperature in all NIF campaigns in DD, DT, and THD* implosions. The NIF NTOF diagnostic is designed to measure neutron yield from 109 to 2 x 1019. The NTOF consists of several detectors of varying sensitivity located on the NIF at about 5 m and 20 m from the target. Production, testing, and calibration of the NIF NTOF detectors have begun at the Laboratory for Laser Energetics (LLE). Operational tests of the NTOF detectors were performed on several facilities including the OMEGA laser at LLE and the Titan laser at Lawrence Livermore National Laboratory (LLNL). Neutron calibrations were carried out on the OMEGA laser. Results of the NTOF detectors tests and calibration will be presented. *(D = deuterium, T = tritium, H = hydrogen)
Date:
May 15, 2008
Creator:
Ali, Z. A.; Glebov, V. Yu.; Cruz, M.; Duffy, T.; Stoeckl, C.; Roberts, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Groundwater Level Status Report for 2005 Los Alamos National Laboratory
The status of groundwater level monitoring at Los Alamos National Laboratory (LANL) in 2005 is provided in this report. The Groundwater Level Monitoring Project was instituted in 2005 to provide a framework for the collection and processing of quality controlled groundwater level data. This report summarizes groundwater level data for 137 monitoring wells, including 41 regional aquifer wells, 22 intermediate wells, and 74 alluvial wells. Pressure transducers were installed in 118 monitoring wells for continuous monitoring of groundwater levels. Time-series hydrographs of groundwater level data are presented along with pertinent construction and location information for each well.
Date:
May 15, 2006
Creator:
Allen, S. P. & Koch, R. J.
Object Type:
Report
System:
The UNT Digital Library
Container Refurbishment Cycle Time Reduction (CTR) Project
In mid-1999, a Cycle Time Reduction (CTR) project was initiated by senior management to improve the overall efficiency of the Container Refurbishment process. A cross-functional team was formed by the Industrial Engineering Services group within Product Certification Organization to evaluate the current process and to propose necessary changes for improvement. The CTR team efforts have resulted in increased productivity equaling approximately $450K per year. The effort also significantly reduced the wait time required necessary to start assembly work on the shop floor. Increasing daily production time and identifying delays were key team goals. Following is a brief summary of accomplishments: (A) Productivity Improvements: (1) Reduced Radcon survey time for empty containers: (i) 50% at 9720-3 (ii) 67% at 9204-2 and (iii) 100% at 9212; (2) Eliminated container inspections at 9720-3; (3) Reduced charged time (includes hands-on labor and support functions) per empty container by 25%; (4) Reduced cycle time to refurbish a container by 25%. (Dramatic wait time reduction -Assembly); (5) Reduced the time for 9212 to receive empty, refurbished containers by 67-80%; (6) Reduced the time for 9204-2E to receive empty, refurbished containers from 1 day to immediate; (7) Implemented software to track time charged per container for continuous …
Date:
May 15, 2000
Creator:
Aloi, Tim; Anthony, Perry; Blair, Tom; Forester, Celina; Hall, Ken; Hawk, Todd et al.
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 107, No. 38, Ed. 1 Sunday, May 15, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 15, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Nucleon momentum distributions from a modified scaling analysis of inclusive electron-nucleus scattering.
Inclusive electron scattering from nuclei at low momentum transfer (corresponding to x {ge} 1) and moderate Q{sup 2} is dominated by quasifree scattering from nucleons. In the impulse approximation, the cross section can be directly connected to the nucleon momentum distribution via the scaling function F(y). The breakdown of the y-scaling assumptions in certain kinematic regions have prevented extraction of nucleon momentum distributions from such a scaling analysis. With a slight modification to the y-scaling assumptions, it is found that scaling functions can be extracted which are consistent with the expectations for the nucleon momentum distributions.
Date:
May 15, 2002
Creator:
Arrington, J.
Object Type:
Article
System:
The UNT Digital Library
The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
The Large Area Telescope (Fermi/LAT, hereafter LAT), the primary instrument on the Fermi Gamma-ray Space Telescope (Fermi) mission, is an imaging, wide field-of-view (FoV), high-energy {gamma}-ray telescope, covering the energy range from below 20 MeV to more than 300 GeV. The LAT was built by an international collaboration with contributions from space agencies, high-energy particle physics institutes, and universities in France, Italy, Japan, Sweden, and the United States. This paper describes the LAT, its preflight expected performance, and summarizes the key science objectives that will be addressed. On-orbit performance will be presented in detail in a subsequent paper. The LAT is a pair-conversion telescope with a precision tracker and calorimeter, each consisting of a 4 x 4 array of 16 modules, a segmented anticoincidence detector that covers the tracker array, and a programmable trigger and data acquisition system. Each tracker module has a vertical stack of 18 (x, y) tracking planes, including two layers (x and y) of single-sided silicon strip detectors and high-Z converter material (tungsten) per tray. Every calorimeter module has 96 CsI(Tl) crystals, arranged in an eight-layer hodoscopic configuration with a total depth of 8.6 radiation lengths, giving both longitudinal and transverse information about the energy deposition …
Date:
May 15, 2009
Creator:
Atwood, W. B.; /UC, Santa Cruz; Abdo, Aous A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. et al.
Object Type:
Article
System:
The UNT Digital Library
Meso-scale machining capabilities and issues
Meso-scale manufacturing processes are bridging the gap between silicon-based MEMS processes and conventional miniature machining. These processes can fabricate two and three-dimensional parts having micron size features in traditional materials such as stainless steels, rare earth magnets, ceramics, and glass. Meso-scale processes that are currently available include, focused ion beam sputtering, micro-milling, micro-turning, excimer laser ablation, femto-second laser ablation, and micro electro discharge machining. These meso-scale processes employ subtractive machining technologies (i.e., material removal), unlike LIGA, which is an additive meso-scale process. Meso-scale processes have different material capabilities and machining performance specifications. Machining performance specifications of interest include minimum feature size, feature tolerance, feature location accuracy, surface finish, and material removal rate. Sandia National Laboratories is developing meso-scale electro-mechanical components, which require meso-scale parts that move relative to one another. The meso-scale parts fabricated by subtractive meso-scale manufacturing processes have unique tribology issues because of the variety of materials and the surface conditions produced by the different meso-scale manufacturing processes.
Date:
May 15, 2000
Creator:
BENAVIDES,GILBERT L.; ADAMS,DAVID P. & YANG,PIN
Object Type:
Article
System:
The UNT Digital Library
CONTROL OF DYNAMIC APERTURE FOR SYNCHROTRON LIGHT SOURCES.
A summary of how modern analytical and numerical techniques enable one to construct a realistic model of state-of-the-art synchrotron light sources is provided. The effects of engineering tolerances and radiation are included in a self-consistent manner. An approach for utilizing these tools to develop an effective strategy for the design and control of the dynamic aperture for such dynamical systems is also outlined.
Date:
May 15, 2005
Creator:
BENGTSSON, J.
Object Type:
Article
System:
The UNT Digital Library
Pre-launch Estimates for GLAST Sensitivity to Dark Matter Annihilation Signals
We investigate the sensitivity of the Gamma-ray Large Area Space Telescope (GLAST) to indirectly detect weakly interacting massive particles (WIMPs) through the {gamma}-ray signal that their pair annihilation produces. WIMPs are among the favorite candidates to explain the compelling evidence that about 80% of the mass in the Universe is non-baryonic dark matter (DM). They are serendipitously motivated by various extensions of the standard model of particle physics such as Supersymmetry and Universal Extra Dimensions (UED). With its unprecedented sensitivity and its very large energy range (20 MeV to more than 300 GeV) the main instrument on board the GLAST satellite, the Large Area Telescope (LAT), will open a new window of discovery. As our estimates show, the LAT will be able to detect an indirect DM signature for a large class of WIMP models given a cuspy profile for the DM distribution. Using the current state of the art Monte Carlo and event reconstruction software developed within the LAT collaboration, we present preliminary sensitivity studies for several possible sources inside and outside the Galaxy. We also discuss the potential of the LAT to detect UED via the electron/positron channel. Diffuse background modeling and other background issues that will be …
Date:
May 15, 2009
Creator:
Baltz, E. A.; Berenji, B.; Bertone, G.; Bergstrom, L.; Bloom, E.; Bringmann, T. et al.
Object Type:
Article
System:
The UNT Digital Library
The Strategic Petroleum Reserve: History, Perspectives, and Issues
None
Date:
May 15, 2008
Creator:
Bamberger, Robert
Object Type:
Report
System:
The UNT Digital Library
Energy transfer properties and mechanisms [Ion-imaging measurements of the collision step-size distribution]. Final report
None
Date:
May 15, 2000
Creator:
Barker, John R.
Object Type:
Report
System:
The UNT Digital Library
Radiation Chemistry 2008 Gordon Research Conference - July 6-11, 2008
Radiation Chemistry is chemistry initiated by ionizing radiation: i.e. photons or particles with energy sufficient to create charge pairs and/or free radicals in a medium. The important transients include conduction band electrons and 'holes', excitons, ionic and neutral free radicals, highly excited states, and solvated electrons. Effects of radiation span timescales from the energy deposition in femtoseconds, through geminate recombination in picoseconds and nanoseconds, to fast radical chemistry in microseconds and milliseconds, and ultimately to processes like cancer occurring decades later. The radiation sources used to study these processes likewise run from femtosecond lasers to nanosecond accelerators to years of gamma irradiation. As a result the conference has a strong interdisciplinary flavor ranging from fundamental physics to clinical biology. While the conference focuses on fundamental science, application areas highlighted in the present conference will include nuclear power, polymer processing, and extraterrestrial chemistry.
Date:
May 15, 2009
Creator:
Bartels, David M.
Object Type:
Article
System:
The UNT Digital Library
Exemptions from Environmental Law for the Department of Defense: Background and Issues for Congress
This report provides Background and Issues for Congress on Exemptions from Environmental Law for the Department of Defense. several environmental statutes contain national security exemptions which is a department of defense can obtain on a case by case basis.
Date:
May 15, 2007
Creator:
Bearden, David M.
Object Type:
Report
System:
The UNT Digital Library
South Texas Catholic (Corpus Christi, Tex.), Vol. 44, No. 10, Ed. 1 Friday, May 15, 2009
Semi-monthly newspaper from Corpus Christi, Texas published by the Diocese of Corpus Christi that includes news of interest to Diocese members along with advertising.
Date:
May 15, 2009
Creator:
Beaton, Paula J.
Object Type:
Newspaper
System:
The Portal to Texas History