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Experimental Investigation of the Root Cause Mechanism and Effectiveness of Mitigating Actions for Axial Offset Anomaly in Pressurized Water Reactors
Axial offset anomaly (AOA) in pressurized water reactors refers to the presence of a significantly larger measured negative axial offset deviation than predicted by core design calculations. The neutron flux depression in the upper half of high-power rods experiencing significant subcooled boiling is believed to be caused by the concentration of boron species within the crud layer formed on the cladding surface. Recent investigations of the root-cause mechanism for AOA [1,2] suggest that boron build-up on the fuel is caused by precipitation of lithium metaborate (LiBO2) within the crud in regions of subcooled boiling. Indirect evidence in support of this hypothesis was inferred from operating experience at Callaway, where lithium return and hide-out were, respectively, observed following power reductions and power increases when AOA was present. However, direct evidence of lithium metaborate precipitation within the crud has, heretofore, not been shown because of its retrograde solubility. To this end, this investigation has been undertaken in order to directly verify or refute the proposed root-cause mechanism of AOA, and examine the effectiveness of possible mitigating actions to limit its impact in high power PWR cores.
Date:
July 2, 2005
Creator:
Abdel-Khalik, Said
Object Type:
Report
System:
The UNT Digital Library
Measurements of Transverse Energy Distributions in Au+Au Collisions at {radical}s{sub NN} = 200 GeV
Transverse energy (E{sub T}) distributions have been measured for Au+Au collisions at {radical}s{sub NN} = 200 GeV by the STAR collaboration at RHIC. E{sub T} is constructed from its hadronic and electromagnetic components, which have been measured separately. E{sub T} production for the most central collisions is well described by several theoretical models whose common feature is large energy density achieved early in the fireball evolution. The magnitude and centrality dependence of E{sub T} per charged particle agrees well with measurements at lower collision energy, indicating that the growth in E{sub T} for larger collision energy results from the growth in particle production. The electromagnetic fraction of the total E{sub T} is consistent with a final state dominated by mesons and independent of centrality.
Date:
July 2, 2004
Creator:
Adams, J.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D.; Arkhipkin, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Parallel Computation of Intergrated Electronmagnetic, Thermal and Structural Effects for Accelerator Cavities
The successful operation of accelerator cavities has to satisfy both rf and mechanical requirements. It is highly desirable that electromagnetic, thermal and structural effects such as cavity wall heating and Lorentz force detuning in superconducting rf cavities can be addressed in an integrated analysis. Based on the SLAC parallel finite-element code infrastructure for electromagnetic modeling, a novel multi-physics analysis tool has been developed to include additional thermal and mechanical effects. The parallel computation enables virtual prototyping of accelerator cavities on computers, which would substantially reduce the cost and time of a design cycle. The multi-physics tool is applied to the LCLS rf gun for electromagnetic, thermal and structural analyses.
Date:
July 2, 2008
Creator:
Akcelik, V.; Candel, A.; Kabel, A.; Lee, L. Q.; Li, Z.; Ng, C. K. et al.
Object Type:
Article
System:
The UNT Digital Library
Folksonomy
This Tech Talk presentation explores Folksonomy. The author explores some of the more common aspects of folksonomies in the context of Web 2.0.
Date:
July 2, 2008
Creator:
Alemneh, Daniel Gelaw
Object Type:
Presentation
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 28, No. 26, Ed. 1 Thursday, July 2, 2009
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
July 2, 2009
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Oral History Interview with Harlan W. Crouse, July 2, 2004
Access:
Use of this item is restricted to the UNT Community
Interview with Army veteran Harlan W. Crouse, including personal experiences about combat in the Philippines during World War II, the Japanese surrender in Yokohama Harbor, and being present during the post-war U.S. occupation of Japan.
Date:
July 2, 2004
Creator:
Alexander, William J. & Crouse, Harlan W., 1926-
Object Type:
Book
System:
The UNT Digital Library
Substructure of High-pT Jets at the LHC
We study high-p{sub T} jets from QCD and from highly-boosted massive particles such as tops, W,Z and Higgs, and argue that infrared-safe observables can help reduce QCD backgrounds. Jets from QCD are characterized by different patterns of energy flow compared to the products of highly-boosted heavy particle decays, and we employ a variety of jet shapes, observables restricted to energy flow within a jet, to explore this difference. Results from Monte Carlo generators and arguments based on perturbation theory support the discriminating power of the shapes we refer to as planar flow and angularities. We emphasize that for massive jets, these and other observables can be analyzed perturbatively.
Date:
July 2, 2008
Creator:
Almeida, L.G.; Lee, S.J.; Perez, G.; Sterman, G.; Sung, I. & Virzi, J.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 106, No. 80, Ed. 1 Friday, July 2, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 2, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The United States and Europe: Current Issues
The United States and Europe share a long and intertwined history. Both sides of the Atlantic face a common set of international concerns, have few other comparable partners, and share a deep economic relationship. Despite much improvement in overall relations since the divisive debate over Iraq policy, several foreign policy and trade disputes remain. This report examines the current state of the transatlantic relationship and key issues that may have implications for U.S. interests in the second session of the 110th Congress.
Date:
July 2, 2008
Creator:
Archick, Kristin
Object Type:
Report
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 94, No. 164, Ed. 1 Thursday, July 2, 2009
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
July 2, 2009
Creator:
Atkinson, Luke
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
[Letter from Donnis Baggett to the TDNA Directors, July 2, 2004]
Letter from Donnis Baggett to the TDNA Directors, on July 2, 2004 with the subject Board Appointments. The letter begins by stating that two directors serving on the TDNA board have resigned effective immediately. Larry Rose, president and publisher of the Corpus Christi Caller-Times is retiring, and Jack Pate, president and publisher of the San Angelo Standard-Times is moving to Indiana. Due to the significance of a full-staff, Baggett states that it is important to fill the two board positions immediately. As President of TDNA, Baggett has nominated two individuals to fill the board openings with the boards approval.
Date:
July 2, 2004
Creator:
Baggett, Donnis
Object Type:
Letter
System:
The UNT Digital Library
[Response form from Donnis Baggett, July 2, 2004]
Response form from Donnis Baggett to the TDNA Directors in regard to two directors serving on the TDNA board having resigned. Due to the significance of a full-staff, Baggett states that it is important to fill the two board positions immediately. As President of TDNA, Baggett has nominated two individuals to fill the board openings with the boards approval and to respond with their decision.
Date:
July 2, 2004
Creator:
Baggett, Donnis
Object Type:
Text
System:
The UNT Digital Library
Low-budget muon source
Generation of muon beams with protons on a current-carrying target followed by a lithium lens and a quadrupole decay channel is considered. A 8 GeV proton beam from the Fermilab Booster is used to provide a muon beam for the MUCOOL experiment for ionization cooling demonstration. The proposed scheme can also be used to create muon beams with a fraction of a 1 GeV proton beam of the Spallation Neutron Source. Monte Carlo simulations of the entire system are performed. For both cases optimization of the target and matching lithium lens is done. It is shown that such a set followed by an inexpensive decay channel based on quadrupole magnets with and without RF cavities provides a rather intense bunched muon beam.
Date:
July 2, 2001
Creator:
Balbekov, Valeri I. & Mokhov, Nikolai V.
Object Type:
Article
System:
The UNT Digital Library
U.S. Virgin Islands Emergency Management and Homeland Security Statutory Authorities Summarized
This report is one of a series that profiles the emergency management and homeland security statutory authorities of the 50 states, the District of Columbia, the Commonwealth of the Northern Mariana Islands, the Commonwealth of Puerto Rico, and three territories (American Samoa, Guam, and the U.S. Virgin Islands). Each profile identifies the more significant elements of state statutes, generally as codified. This report focuses on the U.S. Virgin Islands.
Date:
July 2, 2004
Creator:
Bea, Keith; Runyon, L. Cheryl & Warnock, Kae M.
Object Type:
Report
System:
The UNT Digital Library
Wisconsin Emergency Management and Homeland Security Statutory Authorities Summarized
This report is one of a series that profiles the emergency management and homeland security statutory authorities of the 50 states, the District of Columbia, the Commonwealth of the Northern Mariana Islands, the Commonwealth of Puerto Rico, and three territories (American Samoa, Guam, and the U.S. Virgin Islands). Each profile identifies the more significant elements of state statutes, generally as codified. This report focuses on the state of Wisconsin.
Date:
July 2, 2004
Creator:
Bea, Keith; Runyon, L. Cheryl & Warnock, Kae M.
Object Type:
Report
System:
The UNT Digital Library
Animal Identification and Meat Traceability
None
Date:
July 2, 2004
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
Lifetime of the 1s2p {sup 1}P{sub 1} Excited Level in Fe{sup 24+}
Measurements of the spectrum of Fe{sup 24+} in the 1.845 {angstrom} to 1.885 {angstrom} range obtained on the EBIT-I electron beam ion trap at Lawrence Livermore National Laboratory were used for determining the radiative lifetime of the ls2p {sup 1}P{sub 1} excited state. The spectrum contains electric dipole forbidden transitions at 1.855{angstrom} (''x'') and 1.868{angstrom} (''z'') whose lineshape is well represented by a Gaussian line profile and is assumed to be due primarily to Doppler and instrumental broadening. The Gaussian contribution is assumed to be the same for all lines in the spectrum. This assumption simplifies the problem when considering a more complex combination of broadening mechanisms. For allowed transitions such as 1s2p {sup 1}P{sub 1} {yields} 1s{sup 2} {sup 1}S{sub 0}, ''w'', at 1.850 {angstrom} we assume a Voigt profile. In the simplest case this combines both natural (Lorentzian) and Doppler (Gaussian) broadening effects which contribute to the width of the spectral line. With the Gaussian contribution determined from lines ''x'' and ''z'', deconvolving the Gaussian from the Voigt profile gives the natural line width. This then is directly related to the radiative lifetime of the 1s2p {sup 1}P{sub 1} excited level.
Date:
July 2, 2002
Creator:
Beiersdorfer, P; Graf, A; Harris, C L; Hwang, D Q & Neill, P A
Object Type:
Article
System:
The UNT Digital Library
Troop Levels in the Afghan and Iraq Wars, FY2001-FY2012: Cost and Other Potential Issues
In February and March 2009, the Obama Administration announced its overall plans to increase troop levels in Afghanistan and decrease troop levels in Iraq for 2009 through 2011. Using several Department of Defense (DOD) data reports, this report describes, analyzes, and estimates deployed troop strength from the 9/11 attacks to FY2012 to provide Congress with a tool to assess current and future DOD war funding requests; implications for the U.S. military presence in the region; and deployment burdens on individual service members and each of the services.
Date:
July 2, 2009
Creator:
Belasco, Amy
Object Type:
Report
System:
The UNT Digital Library
The importance of cytosolic glutamine synthetase in nitrogen assimilation and recycling
Glutamine synthetase assimilates ammonium into amino acids, thus it is a key enzyme for nitrogen metabolism. The cytosolic isoenzymes of glutamine synthetase assimilate ammonium derived from primary nitrogen uptake and from various internal nitrogen recycling pathways. In this way, cytosolic glutamine synthetase is crucial for the remobilization of protein-derived nitrogen. Cytosolic glutamine synthetase is encoded by a small family of genes that are well conserved across plant species. Members of the cytosolic glutamine synthetase gene family are regulated in response to plant nitrogen status, as well as to environmental cues, such as nitrogen availability and biotic/abiotic stresses. The complex regulation of cytosolic glutamine synthetase at the transcriptional to post-translational levels is key to the establishment of a specific physiological role for each isoenzyme. The diverse physiological roles of cytosolic glutamine synthetase isoenzymes are important in relation to current agricultural and ecological issues.
Date:
July 2, 2009
Creator:
Bernard, S. M. & Habash, D. Z.
Object Type:
Article
System:
The UNT Digital Library
Iraq: Oil and Gas Legislation, Revenue Sharing, and U.S. Policy
This report reviews policy proposals and interim contracts, analyzes the positions of various Iraqi political actors, and discusses potential implications for U.S. foreign policy goals in Iraq.
Date:
July 2, 2008
Creator:
Blanchard, Christopher M.
Object Type:
Report
System:
The UNT Digital Library
Army Aviation: The RAH-66 Comanche Helicopter Issue
Although it has been a high priority Army program, a number of factors have complicated the RAH-66 Comanche program. Since its inception, the program has been restructured several times–postponing the initial operational capability (IOC) and increasing overall program costs. Presently, there is debate within the Army regarding whether the program should be reduced significantly to make funds available to pursue other modernization priorities.
Date:
July 2, 2003
Creator:
Bolkcom, Christopher
Object Type:
Report
System:
The UNT Digital Library
Potential F-22 Raptor Export to Japan
This report discusses issues surrounding Japan's interest in purchasing the F-22A Raptor aircraft from the United States. Although the export of the plane is now prohibited by U.S. law, Congress has recently and may again consider repealing this ban.
Date:
July 2, 2007
Creator:
Bolkcom, Christopher & Chanlett-Avery, Emma
Object Type:
Report
System:
The UNT Digital Library
300 AREA URANIUM CONTAMINATION
{sm_bullet} Uranium fuel production {sm_bullet} Test reactor and separations experiments {sm_bullet} Animal and radiobiology experiments conducted at the. 331 Laboratory Complex {sm_bullet} .Deactivation, decontamination, decommissioning,. and demolition of 300 Area facilities
Date:
July 2, 2009
Creator:
Borghese, J. V.
Object Type:
Article
System:
The UNT Digital Library
Polymer Growth Rate in a Wire Chamber with Oxygen,Water, or Alcohol Gas Additives
The rate of polymer growth on wires was measured in a wire chamber while the chamber was aged initially with helium-isobutane (80:20) gas, and then with either oxygen, water, or alcohol added to the gas. At the completion of the aging process for each gas mixture, the carbon content on the wires was measured in a SEM/EDX instrument. The same physical wires were used in all the gas mixtures, allowing measurement of polymer build up or polymer depletion by each gas additive. It is found that the rate of polymer growth is not changed by the presence of oxygen, water or alcohol. Conjecture that oxygen reduces breakdown by removing polymer deposits on field wires is negated by these measurements. Instead, it appears that the reduced breakdown is due to lower resistance in the polymer from oxygen ions being transported into the polymer. It is also observed that field wires bombarded by the electrons in the SEM and then placed back into the chamber show an abundance of single electrons being emitted, indicating that electron charge is stored in the polymer layer and that a high electric field is necessary to remove the charge.
Date:
July 2, 2008
Creator:
Boyarski, Adam
Object Type:
Article
System:
The UNT Digital Library