Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"ORNL"”.
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A comparison of three computational phantoms for calibration of a radiation portal monitor used for measurement of internal contamination.
… of Florida – Oak Ridge National Laboratories (UF-ORNL) stylized phantom, and the International Commission on Radiological Protection (ICRP) adult male voxel phantom. A percent difference ranging from 10-15% and 25-30% was observed at high energies (100-2000 keV) for the UF-ORNL and voxel …
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Effect of Chemistry on the Transformation of Austenite to Martensite for Intercritically Austempered Ductile Iron
… Neutron Source at Oak Ridge National Laboratory (ORNL). Both diffraction and tensile data were collected and synced using the VDRIVE software (a proprietary ORNL software package). The single peak fit method was employed in the analysis of the diffraction data. In this thesis, the stress and …
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Experimental approaches for the production of thorium-229
… Reactor (HFIR) at Oak Ridge National Laboratory (ORNL) and 2) the fast neutron irradiation of a 230Th target in a particle accelerator. This thesis outlines several experiments completed at ORNL to test the feasibility and preparation procedures for these two production methods. First, we …
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A NEW MEASUREMENT OF THE NEUTRON MULTIPLICITY EMITTED IN 252Cf SPONTANEOUS FISSION
… Reactor (HFIR) at Oak Ridge national Laboratory (ORNL). The PROSPECT antineutrino detector (AD) provided excellent background rejection due to its segmented design and use of 6Li-loaded liquid scintillator for a neutron capture target. By tracking the neutron capture lifetime from cosmogenic …
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Fuel processing simulation tool for liquid-fueled nuclear reactors
… simulation results obtained with ChemTRITON at ORNL. The average 232Th feed rate obtained is the current work is 2.40 kg/d, which is consistent with ORNL results (2.45 kg/d). This simulation showed that the online fission product extraction and online refueling with 232Th allowed the MSBR to …
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Reconsideration of Inherent Neutron Sources in Liquid Fuel of Molten Salt Reactors
… cross-sections and compared to original ORNL 0.5 mb cross-section, which was for beryllium-9 salt component only. Recalculated reaction rates are markedly greater than original MSRE rates in fresh (unaged) fuel salt.
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Thermal, Electrical, and Structural Analysis of Graphite Foam
… was developed at Oak Ridge National Laboratory (ORNL) by Dr. James Klett and license was granted to POCO Graphite, Inc. to manufacture and market the product as PocoFoam. Unlike many processes currently used to manufacture carbon foams, this process yields a highly graphitic structure and …
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Considerations in the design and operation of synchrotron radiation beamlines (including a discussion on the properties of synchrotron radiation
… Laboratory (NRL) and the Oak Ridge National Lab (ORNL). The major optical components of these beamlines are reviewed in regards to their function and their flexibility. A detailed analysis is performed on the NRL X-ray collimating mirror. The mirror is treated as an elastically bent beam. …
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Deidentification of Face Videos in Naturalistic Driving Scenarios
… is conducted using a large-scale dataset from ORNL, enabling the quantification of errors associated with head movements, mouth movements, eye movements, and other human factors cues. Additionally, qualitative analysis using metrics such as PERCLOS (Percentage of Eye Closure) and human …
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Modeling and Predicting Incidence: Critical Systems Failures and Flu Infection Cases
… with Oak Ridge National Laboratory (ORNL) and working on the real CI networks provided by them, we find that HotSpots helps solve what-if scenarios. By using the digital surveillance data reported by the Centers for Disease Control and Prevention (CDC), we carry on experiments and …
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Structural limitations of additively manufactured building panels
… BAAM using the design constraints laid out by ORNL. Strict limitations in terms of possible print path required changes to the geometry of the structure that increased deflection under loading by a factor of 10. Tensile tests in accordance with ISO 527-2 were run on samples of rPET printed on …
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Modeling Light Duty Vehicle Emissions Based on Instantaneous Speed and Acceleration Levels
… collected at the Oak Ridge National Laboratory (ORNL) that included fuel consumption and emission rate measurements (CO, HC, and NOx) for five light-duty vehicles (LDVs) and three light-duty trucks (LDTs) as a function of the vehicle's instantaneous speed and acceleration levels. The hybrid …
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Thermal-hydraulic analysis of innovative fuel configurations for the sodium fast reactor
… RELAP5-3D subchannel model was applied to the ORNL 19-pin test, and it was found that the code could predict the measured outlet temperature distribution with a maximum error of -8%.
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Development of a Minichannel Compact Primary Heat Exchanger for a Molten Salt Reactor
… and tested at Oak Ridge National Laboratory (ORNL) in the 1960's, but recent technological advancements now allow for new components, such as heat exchangers, to be created for the next generation of MSR's and molten salt-cooled reactors. The primary (fuel salt-to-secondary salt) heat …
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On-line refueling for the advanced high temperature reactor
… developed at Oak Ridge National Laboratory (ORNL) and based on the use of graphite as moderator, TRISO particles as fuel and FLiBe as coolant. The AHTR reference design is based on a traditional batch refueling approach, which requires to shut down the reactor and replace/reshuffle a certain …
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Finite element simulation of creep behavior in enhanced refractory material for glass furnace
… materials, Oak Ridge National Laboratory (ORNL) is utilizing High Density Infrared (HDI) technology. This technology, which is relatively new to materials processing, is increasingly being researched in the development of coatings and surface modifications for refractory materials.;This …
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Numerical solution of multiple front phase change problems for modeling ice thermal storage systems
… data from Oak Ridge National Laboratory (ORNL) for Calmac and Baltimore Air Coil (BAC) ice thermal storage systems which have counter flow arrangements. The predicted and measured results for the brine exit temperatures and load profiles are in good agreement throughout most of the charge …
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Estimation of coping time in pressurized water reactors for accident tolerant fuel claddings
… work, and the Oak Ridge National Laboratory (ORNL) model based on experimental results of ORNL's work. The results showed that ATF claddings increase the coping time and produce less hydrogen compared to Zircaloy cladding under the considered BDBAs scenarios.
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Gamma and neutron dose profiles near a Cf-252 brachytherapy source
… in 2002 at the Oak Ridge National Laboratory (ORNL). The combination of small size and large activity of these Cf-252 sources makes them suitable to be used with the conventional high-dose-rate (HDR) remote afterloading systems for interstitial brachytherapy. A recent in-water calibration …
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Integrated fuel performance and thermal-hydraulic sub-channel models for analysis of sodium fast reactors
… data from the Oak Ridge National Laboratory (ORNL) 19-Pin Bundle, the Toshiba 37-Pin Bundle, and the Westinghouse Advanced Reactors Division (WARD) 61-Pin Bundle. Important topics that were addressed for coupling the codes include the following. The importance of azimuthal effects in the fuel …
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