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539 Matching Results
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Characterization of the Radiation Shielding Properties of US andRussian EVA Suits
Reported herein are results from the Eril Research, Inc.(ERI) participationin the NASA Johnson Space Center sponsored studycharacterizing the radiation shielding properties of the two types ofspace suit that astronauts are wearing during the EVA on-orbit assemblyof the International Space Station (ISS). Measurements using passivedetectors were carried out to assess the shielding properties of the USEMU Suit and the Russian Orlan-M suit during irradiations of the suitsand a tissue equivalent phantom to monoenergetic proton and electronbeams at the Loma Linda University Medical Center (LLUMC). Duringirradiations of 6 MeV electrons and 60 MeV protons, absorbed dose as afunction of depth was measured using TLDs exposed behind swatches of thetwo suit materials and inside the two EVA helmets. Considerable reductionin electron dosewas measured behind all suit materials in exposures to 6MeV electrons. Slowing of the proton beam in the suit materials led to anincrease in dose measured in exposures to 60 MeV protons. During 232 MeVproton irradiations, measurements were made with TLDs and CR-39 PNTDs atfive organ locations inside a tissue equivalent phantom, exposed bothwith and without the two EVA suits. The EVA helmets produce a 13 to 27percent reduction in total dose and a 0 to 25 percent reduction in doseequivalent when …
Date:
October 26, 2001
Creator:
Benton, E. R.; Benton, E. V. & Frank, A. L.
Object Type:
Report
System:
The UNT Digital Library
Laser Beam Propagation through Inertial Confinement Fusion Hohlraum Plasmas
A study of the relevant laser-plasma interaction processes has been performed in long-scale length plasmas that emulate the plasma conditions in indirect drive inertial confinement fusion targets. Experiments in this high-temperature (T{sub e} = 3.5 keV), dense (n{sub e} = 0.5 - 1 x 10{sup -3}) hohlraum plasma have demonstrated that blue 351-nm laser beams produce less than 1% total backscatter resulting in transmission greater than 90% for ignition relevant laser intensities (I < 2 x 10{sup 15} W cm{sup -2}). The bulk plasma conditions have been independently characterized using Thomson scattering where the peak electron temperatures are shown to scale with the hohlraum heater beam energy in the range from 2 keV to 3.5 keV. This feature has allowed us to determine the thresholds for both backscattering and filamentation instabilities; the former measured with absolutely calibrated full aperture backscatter and near backscatter diagnostics and the latter with a transmitted beam diagnostics. Comparing the experimental results with detailed gain calculations for the onset of significant laser scattering processes shows that these results are relevant for the outer beams in ignition hohlraum experiments corresponding to a gain threshold for stimulated Brillouin scattering of 15. By increasing the gas fill density in …
Date:
October 26, 2006
Creator:
Froula, D. H.; Divol, L.; Meezan, N. B.; DIxit, S.; Neumayer, P.; Moody, J. D. et al.
Object Type:
Article
System:
The UNT Digital Library
Development of Semiconductor Imaging Detectors for a Si/CdTe Compton Camera
None
Date:
October 26, 2007
Creator:
Watanabe, S.; Takeda, S.; Ishikawa, S. N.; Odaka, H.; Ushio, M.; Tanaka, T. et al.
Object Type:
Article
System:
The UNT Digital Library
Performance Study of Si/CdTe Semiconductor Compton Telescopes With Monte Carlo Simulation
None
Date:
October 26, 2007
Creator:
Odaka, H.; Takeda, S.; /JAXA, Tokyo /Tokyo U.; Watanabe, S.; /JAXA, Tokyo; Ishikawa, S.N. et al.
Object Type:
Article
System:
The UNT Digital Library
Final Technical Report
The Georgia Institute of Technology’s Industrial Assessment Center (GT IAC) has a long history working on the IAC program with over 30 years of experience in meeting the IAC program’s goals in a very effective manner since beginning participation in the IAC program’s predecessor, the EADC, in 1977. During the last four year contract period, October 1, 2002 through September 31, 2006, the GT IAC continued this work with the assessments of eighty nine (89) industrial facilities. These assessments resulted in the reported implemented savings of forty eight thousand (48,000,000) kWh of electricity and seven hundred and fifty thousand (750,000) MMBtu of natural gas. The total calculated cost savings from the recommendations implemented was five and a half million dollars ($5,500,000). These savings reoccur annually. However, this cost savings is the total of various recommendations that were calculated during 2002 to 2006. During this time period, energy prices were almost always lower than current energy prices. If you adjust the cost savings number to account for current energy prices, the cost savings would exceed nine million dollars ($9,000,000) reoccurring annually. Beyond the reduction of industrial energy consumption and the cost savings benefit, education has also been an important element of …
Date:
October 26, 2007
Creator:
Meffert, Bill & Soderlund, Matthew, R
Object Type:
Report
System:
The UNT Digital Library
Action Memorandum for General Decommissioning Activities under the Idaho Cleanup Project
This Action Memorandum documents the selected alternative to perform general decommissioning activities at the Idaho National Laboratory (INL) under the Idaho Cleanup Project (ICP). Preparation of this Action Memorandum has been performed in accordance with the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), as amended by the "Superfund Amendments and Reauthorization Act of 1986", and in accordance with the "National Oil and Hazardous Substances Pollution Contingency Plan". An engineering evaluation/cost analysis (EE/CA) was prepared and released for public comment and evaluated alternatives to accomplish the decommissioning of excess buildings and structures whose missions havve been completed.
Date:
October 26, 2006
Creator:
Reno, S. L.
Object Type:
Report
System:
The UNT Digital Library
Mutagenic Potency of Food-Derived Heterocyclic Amines
The understanding of mutagenic potency has been primarily approached using ''quantitative structure activity relationships'' (QSAR). Often this method allows the prediction of mutagenic potency of the compound based on its structure. But it does not give the underlying reason why the mutagenic activities differ. We have taken a set of heterocyclic amine structures and used molecular dynamic calculations to dock these molecules into the active site of a computational model of the cytochrome P-450 1A1 enzyme. The calculated binding strength using Boltzman distribution constants was then compared to the QSAR value (HF/6-31G* optimized structures) and the Ames/Salmonella mutagenic potency. Further understanding will only come from knowing the complete set of mutagenic determinants. These include the nitrenium ion half-life, DNA adduct half-life, efficiency of repair of the adduct, and ultimately fixation of the mutation through cellular processes. For two isomers, PhIP and 3-Me-PhIP, we showed that for the 100-fold difference in the mutagenic potency a 5-fold difference can be accounted for by differences in the P450 oxidation. The other factor of 20 is not clearly understood but is downstream from the oxidation step. The application of QSAR (chemical characteristics) to biological principles related to mutagenesis is explored in this report.
Date:
October 26, 2006
Creator:
Felton, J S; Knize, M G; Wu, R W; Colvin, M E; Hatch, F T & Malfatti, M A
Object Type:
Article
System:
The UNT Digital Library
Final Technical Report
Executive Summary The document contains Final Technical Report on the Industrial Assessment Center Program at Loyola Marymount University in Los Angeles, covering the contract period of 9/1/2002 to 11/30/2006, under the contract DE-FC36-02GO 12073. The Report describes six required program tasks, as follows: TASK 1 is a summary of the assessments performed over the life of the award: 77 assessments were performed, 595 AR were recommended, covering a very broad range of manufacturing plants. TASK 2 is a description of the efforts to promote and increase the adoption of assessment recommendations and employ innovative methods to assist in accomplishing these goals. The LMU IAC has been very successful in accomplishing the program goals, including implemented savings of $5,141,895 in energy, $10,045,411 in productivity and $30,719 in waste, for a total of $15,218,025. This represents 44% of the recommended savings of $34,896,392. TASK 3 is a description of the efforts promoting the IAC Program and enhancing recruitment efforts for new clients and expanded geographic coverage. LMU IAC has been very successful recruiting new clients covering Southern California. Every year, the intended number of clients was recruited. TASK 4 describes the educational opportunities, training, and other related activities for IAC students. A …
Date:
October 26, 2007
Creator:
Oppenheim, Bohdan W. & Marloth, Rudolf
Object Type:
Report
System:
The UNT Digital Library
Ultra-wide Range Gamma Detector System for Search and Locate Operations
Collecting debris samples following a nuclear event requires that operations be conducted from a considerable stand-off distance. An ultra-wide range gamma detector system has been constructed to accomplish both long range radiation search and close range hot sample collection functions. Constructed and tested on a REMOTEC Andros platform, the system has demonstrated reliable operation over six orders of magnitude of gamma dose from 100's of uR/hr to over 100 R/hr. Functional elements include a remotely controlled variable collimator assembly, a NaI(Tl)/photomultiplier tube detector, a proprietary digital radiation instrument, a coaxially mounted video camera, a digital compass, and both local and remote control computers with a user interface designed for long range operations. Long range sensitivity and target location, as well as close range sample selection performance are presented.
Date:
October 26, 2005
Creator:
Odell, D. Mackenzie Odell; Harpring, Larry J.; Moore, Frank S. Jr.; French, Phillip J. & Gordon, John R.
Object Type:
Article
System:
The UNT Digital Library
Metrics and Benchmarks for Energy Efficiency in Laboratories
A wide spectrum of laboratory owners, ranging from universities to federal agencies, have explicit goals for energy efficiency in their facilities. For example, the Energy Policy Act of 2005 (EPACT 2005) requires all new federal buildings to exceed ASHRAE 90.1-2004 1 by at least 30 percent. The University of California Regents Policy requires all new construction to exceed California Title 24 2 by at least 20 percent. A new laboratory is much more likely to meet energy efficiency goals if quantitative metrics and targets are explicitly specified in programming documents and tracked during the course of the delivery process. If efficiency targets are not explicitly and properly defined, any additional capital costs or design time associated with attaining higher efficiencies can be difficult to justify. The purpose of this guide is to provide guidance on how to specify and compute energy efficiency metrics and benchmarks for laboratories, at the whole building as well as the system level. The information in this guide can be used to incorporate quantitative metrics and targets into the programming of new laboratory facilities. Many of these metrics can also be applied to evaluate existing facilities. For information on strategies and technologies to achieve energy efficiency, …
Date:
October 26, 2007
Creator:
Mathew, Paul
Object Type:
Report
System:
The UNT Digital Library
Development of Double-Sided Silicon Strip Detectors (DSSD) for a Compton Telescope
None
Date:
October 26, 2007
Creator:
Takeda, S.; Watanabe, S.; Tanaka, T.; Nakazawa, K.; Takahashi, T.; Fukazawa, Y. et al.
Object Type:
Article
System:
The UNT Digital Library
LATEST RESULTS FROM MINOS.
Among the goals of the MINOS experiment are the test of the {nu}{sub {mu}} {yields} {nu}{sub {tau}} oscillation and the search for sub-dominant {nu}{sub {mu}} {yields} {nu}{sub {tau}} oscillations. The former proceeds by a {nu}{sub {mu}} ''disappearance'' analysis while the latter would involve the ''appearance'' of {nu}{sub e} interactions in a predominantly {nu}{sub {mu}} beam. The disappearance of muon neutrinos is described by P({nu}{sub {mu}} {yields} {mu}{sub {mu}}) = 1 - sin{sup 2} 2{theta}{sub 23} sin{sup 2} (1.27 {Delta} m{sub 23}{sup 2} L/E) in the two-flavor approximation where {theta}{sub 23} is the angle between the second row and third column of the neutrino mixing matrix, {Delta}m{sub 23}{sup 2} = m{sub 2}{sup 2}-m{sub 3}{sup 2} (eV{sup 2}), L is the neutrino flight distance in km and E is the neutrino energy in GeV. A generic disappearance experiment compares a measured muon neutrino energy spectrum at a fixed baseline to the known energy spectrum of muon neutrino beam to extract the oscillation parameters sin{sup 2} 2{theta} which controls the overall magnitude of the disappearance and {Delta}m{sup 2} which controls the energy dependence.
Date:
October 26, 2006
Creator:
JAFFE,D.E.
Object Type:
Article
System:
The UNT Digital Library
Proceedings of the North Aleutian Basin information status and research planning meeting.
The North Aleutian Basin Planning Area of the Minerals Management Service (MMS) is a large geographic area with significant ecological and natural resources. The Basin includes most of the southeastern part of the Bering Sea continental shelf including all of Bristol Bay. The area supports important habitat for a wide variety of species and globally significant habitat for birds and marine mammals including federally listed species. Villages and communities of the Alaska Peninsula and other areas bordering or near the Basin rely on its natural resources (especially commercial and subsistence fishing) for much of their sustenance and livelihood. The offshore area of the North Aleutian Basin is considered to have important hydrocarbon reserves, especially natural gas. In 2006, the MMS released a draft proposed program, Outer Continental Shelf Oil and Gas Leasing Program, 2007-2012 and an accompanying draft programmatic environmental impact statement (EIS). The draft proposed program identified two lease sales proposed in the North Aleutian Basin in 2010 and 2012, subject to restrictions. The area proposed for leasing in the Basin was restricted to the Sale 92 Area in the southwestern portion. Additional EISs will be needed to evaluate the potential effects of specific lease actions, exploration activities, and …
Date:
October 26, 2007
Creator:
LaGory, K. E.; Krummel, J. R.; Hayse, J. W.; Hlohowskyj, I.; Stull, E. A.; Gorenflo, L. et al.
Object Type:
Report
System:
The UNT Digital Library
Parallel Clustering Algorithms for Structured AMR
We compare several different parallel implementation approaches for the clustering operations performed during adaptive gridding operations in patch-based structured adaptive mesh refinement (SAMR) applications. Specifically, we target the clustering algorithm of Berger and Rigoutsos (BR91), which is commonly used in many SAMR applications. The baseline for comparison is a simplistic parallel extension of the original algorithm that works well for up to O(10{sup 2}) processors. Our goal is a clustering algorithm for machines of up to O(10{sup 5}) processors, such as the 64K-processor IBM BlueGene/Light system. We first present an algorithm that avoids the unneeded communications of the simplistic approach to improve the clustering speed by up to an order of magnitude. We then present a new task-parallel implementation to further reduce communication wait time, adding another order of magnitude of improvement. The new algorithms also exhibit more favorable scaling behavior for our test problems. Performance is evaluated on a number of large scale parallel computer systems, including a 16K-processor BlueGene/Light system.
Date:
October 26, 2005
Creator:
Gunney, B T; Wissink, A M & Hysom, D A
Object Type:
Article
System:
The UNT Digital Library
In-Orbit Performance of the Hard X-Ray Detector on Borad Suzaku
The in-orbit performance and calibration of the Hard X-ray Detector (HXD) on board the X-ray astronomy satellite Suzaku are described. Its basic performances, including a wide energy bandpass of 10-600 keV, energy resolutions of {approx}4 keV (FWHM) at 40 keV and {approx}11% at 511 keV, and a high background rejection efficiency, have been confirmed by extensive in-orbit calibrations. The long-term gains of PIN-Si diodes have been stable within 1% for half a year, and those of scintillators have decreased by 5-20%. The residual non-X-ray background of the HXD is the lowest among past non-imaging hard X-ray instruments in energy ranges of 15-70 and 150-500 keV. We provide accurate calibrations of energy responses, angular responses, timing accuracy of the HXD, and relative normalizations to the X-ray CCD cameras using multiple observations of the Crab Nebula.
Date:
October 26, 2007
Creator:
Kokubun, Motohide; Makishima, Kazuo; Takahashi, Tadayuki; Murakami, Toshio; Tashiro, Makoto; Fukazawa, Yasushi et al.
Object Type:
Article
System:
The UNT Digital Library
Investigation of Generation, Acceleration, Transport and Final Focusing of High-Intensity Heavy Ion Beams from Sources to Targets
Under the auspices of the research grant, the Intense Beam Theoretical Research Goup at Massachusetts Institute of Technology's Plasma Science and Fusion Center made significant contributions in a number of important areas in the HIF and HEDP research, including: (a) Derivation of rms envelope equations and study of rms envelope dynamics for high-intensity heavy ion beams in a small-aperture AG focusing transport systems; (b) Identification of a new mechanism for chaotic particle motion, halo formation, and beam loss in high-intensity heavy ion beams in a small-aperture AG focusing systems; Development of elliptic beam theory; (d) Study of Physics Issues in the Neutralization Transport Experiment (NTX).
Date:
October 26, 2006
Creator:
Chen, Chiping
Object Type:
Report
System:
The UNT Digital Library
The EPA Office of Environmental Justice Small Grants Program
This report is an inventory of the profiles of the Environmental Justice Small Grants awarded for FY 2003. It shows each regions grants awards depending on socioeconomic balance, diversity of recipients, and sustainability of benefits.
Date:
October 26, 2004
Creator:
United States. Environmental Protection Agency.
Object Type:
Report
System:
The UNT Digital Library
Steady-State Flammable Gas Release Rate Calculation and Lower Flammability Level Evaluation for Hanford Tank Waste
Assess the steady-state flammability level at normal and off-normal ventilation conditions. The methodology of flammability analysis for Hanford tank waste is developed. The hydrogen generation rate model was applied to calculate the gas generation rate for 177 tanks. Flammability concentrations and the time to reach 25% and 100% of the lower flammability limit, and the minimum ventilation rate to keep from 100 of the LFL are calculated for 177 tanks at various scenarios.
Date:
October 26, 2007
Creator:
Hu, T. A.
Object Type:
Report
System:
The UNT Digital Library
Demonstration Assessment of Light-Emitting Diode (LED) Freezer Case Lighting in Albertsons Grocery in Eugene, OR
SSL GATEWAY demonstration report of freeezer case lighitng retrofit to LED lighiting in Eugene, OR
Date:
October 26, 2009
Creator:
Richman, Eric E. & Tuenge, Jason R.
Object Type:
Report
System:
The UNT Digital Library
STEADY STATE FLAMMABLE GAS RELEASE RATE CALCULATION AND LOWER FLAMMABILITY LEVEL EVALUATION FOR HANFORD TANK WASTE
This report assesses the steady state flammability level under off normal ventilation conditions in the tank headspace for 28 double-shell tanks (DST) and 149 single shell-tanks (SST) at the Hanford Site. Flammability was calculated using estimated gas release rates, Le Chatelier's rule, and lower flammability limits of fuels in an air mixture. This revision updates the hydrogen generation rate input data for all 177 tanks using waste composition information from the Best Basis Inventory Detail Report (data effective as of August 4,2008). Assuming only barometric breathing, the shortest time to reach 25% of the lower flammability limit is 11 days for DSTs (i.e., tank 241-AZ-10l) and 36 days for SSTs (i.e., tank 241-B-203). Assuming zero ventilation, the shortest time to reach 25% of the lower flammability limit is 10 days for DSTs (i.e., tank 241-AZ-101) and 34 days for SSTs (i.e., tank 241-B-203).
Date:
October 26, 2009
Creator:
JE, MEACHAM
Object Type:
Report
System:
The UNT Digital Library
San Antonio Register (San Antonio, Tex.), Vol. 69, No. 19, Ed. 1 Thursday, October 26, 2000
Weekly newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
October 26, 2000
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Lexington Observer (Lexington, Okla.), Vol. 11, No. 28, Ed. 1 Thursday, October 26, 2006
Weekly newspaper from Lexington, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 26, 2006
Creator:
Edwards, Olvis
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Ranger (San Antonio, Tex.), Vol. 82, No. 7, Ed. 1 Friday, October 26, 2007
Weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.
Date:
October 26, 2007
Creator:
San Antonio College
Object Type:
Newspaper
System:
The Portal to Texas History
Sanger Courier (Sanger, Tex.), Vol. 102, No. 1, Ed. 1 Thursday, October 26, 2000
Weekly newspaper from Sanger, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 26, 2000
Creator:
Hardy, Lisa
Object Type:
Newspaper
System:
The Portal to Texas History