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Barrier Coatings for Refractory Metals and Superalloys
In the closed working fluid loop of the proposed Prometheus space nuclear power plant (SNPP), there is the potential for reaction of core and plant structural materials with gas phase impurities and gas phase transport of interstitial elements between superalloy and refractory metal alloy components during service. Primary concerns are surface oxidation, interstitial embrittlement of refractory metals and decarburization of superalloys. In parallel with kinetic investigations, this letter evaluates the ability of potential coatings to prevent or impede communication between reactor and plant components. Key coating requirements are identified and current technology coating materials are reviewed relative to these requirements. Candidate coatings are identified for future evaluation based on current knowledge of design parameters and anticipated environment. Coatings were identified for superalloys and refractory metals to provide diffusion barriers to interstitial transport and act as reactive barriers to potential oxidation. Due to their high stability at low oxygen potential, alumina formers are most promising for oxidation protection given the anticipated coolant gas chemistry. A sublayer of iridium is recommended to provide inherent diffusion resistance to interstitials. Based on specific base metal selection, a thin film substrate--coating interdiffusion barrier layer may be necessary to meet mission life.
Date:
February 23, 2006
Creator:
Sabol, SM; Randall, BT; Edington, JD; Larkin, CJ & Close, BJ
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 76, Ed. 1 Thursday, February 23, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 23, 2006
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Beyond Boltzmann-Gibbs statistics: Maximum entropy hyperensemblesout-of-equilibrium
What is the best description that we can construct of athermodynamic system that is not in equilibrium, given only one, or afew, extra parameters over and above those needed for a description ofthe same system at equilibrium? Here, we argue the most appropriateadditional parameter is the non-equilibrium entropy of the system, andthat we should not attempt to estimate the probability distribution ofthe system, but rather the metaprobability (or hyperensemble) that thesystem is described by a particular probability distribution. The resultis an entropic distribution with two parameters, one a non-equilibriumtemperature, and the other a measure of distance from equilibrium. Thisdispersion parameter smoothly interpolates between certainty of acanonical distribution at equilibrium and great uncertainty as to theprobability distribution as we move away from equilibrium. We deducethat, in general, large, rare fluctuations become far more common as wemove away from equilibrium.
Date:
February 23, 2006
Creator:
Crooks, Gavin E.
Object Type:
Article
System:
The UNT Digital Library
The Canadian Record (Canadian, Tex.), Vol. 116, No. 8, Ed. 1 Thursday, February 23, 2006
Weekly newspaper from Canadian, Texas that includes local, state and national news along with some advertising.
Date:
February 23, 2006
Creator:
Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
[Cassandra Berry addressing banquet attendees]
A photograph of Cassandra Berry at a podium during a banquet at the Equity and Diversity Conference at UNT. Berry is introducing actor B. D. Wong to the group and Wong is sitting at a table near the front of the room.
Date:
February 23, 2006
Creator:
University of North Texas. Multicultural Center.
Object Type:
Photograph
System:
The UNT Digital Library
[Cassandra Berry and B. D. Wong holding plaque]
A photograph of Cassandra Berry and B. D. Wong during the Equity and Diversity Conference at UNT. Berry is handing Wong a plaque honoring him as an "Ally" through the Equity and Diversity department. They are standing on the stage together and a podium and a stool are positioned in front of them.
Date:
February 23, 2006
Creator:
University of North Texas. Multicultural Center.
Object Type:
Photograph
System:
The UNT Digital Library
[Cassandra Berry and B.D. Wong laughing on stage]
A photograph of Cassandra Berry and B. D. Wong at the 2006 UNT Equity and Diversity Conference. They are standing on stage for a talk and Berry is behind the podium while Wong is taking a basketball out of a bag beside her.
Date:
February 23, 2006
Creator:
University of North Texas. Multicultural Center.
Object Type:
Photograph
System:
The UNT Digital Library
[Cassandra Berry and B. D. Wong laughing on stage]
A photograph of B. D. Wong and Christina Berry during the Equity and Diversity Conference at UNT. They are standing on the stage together for a presentation in which Wong receives thank you gifts from UNT. Berry is behind a podium and Wong is holding a white basketball that has been signed by multiple people; they are both laughing. There is also a UNT bag on the stool in front of Wong.
Date:
February 23, 2006
Creator:
University of North Texas. Multicultural Center.
Object Type:
Photograph
System:
The UNT Digital Library
[Cassandra Berry introducing B. D. Wong at banquet]
A photograph of Cassandra Berry at a podium during a banquet at the Equity and Diversity Conference at UNT. Berry is introducing actor B. D. Wong to the group and Wong is sitting at a table near the front of the room.
Date:
February 23, 2006
Creator:
University of North Texas. Multicultural Center.
Object Type:
Photograph
System:
The UNT Digital Library
[Cassandra Berry on stage behind a podium]
A photograph of Cassandra Berry at a podium during the Equity and Diversity Conference at UNT. Berry is on a stage and is wearing a black dress with a colorful patterned shawl over it. There is also a stool next to the podium.
Date:
February 23, 2006
Creator:
University of North Texas. Multicultural Center.
Object Type:
Photograph
System:
The UNT Digital Library
[Cassandra Berry presenting basketball to B. D. Wong]
A photograph of B. D. Wong and Christina Berry during the Equity and Diversity Conference at UNT. They are standing on the stage together for a presentation in which Wong receives thank you gifts from UNT. Berry is behind a podium and is laughing while Wong is holding a white basketball that has been signed by multiple people. There is also a UNT bag on the stool in front of him.
Date:
February 23, 2006
Creator:
University of North Texas. Multicultural Center.
Object Type:
Photograph
System:
The UNT Digital Library
Civil Charges in Corporate Scandals
This report lists civil suits filed by federal regulatory agencies charging individuals and corporations with violations related to these scandals.
Date:
February 23, 2006
Creator:
Jickling, Mark & Janov, Paul H.
Object Type:
Report
System:
The UNT Digital Library
Comanche Chief (Comanche, Tex.), No. 43, Ed. 1 Thursday, February 23, 2006
Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.
Date:
February 23, 2006
Creator:
Wilkerson, James C., III
Object Type:
Newspaper
System:
The Portal to Texas History
Comparison of two- and three-dimensional simulations of miscible Rayleigh-Taylor instability
A comparison of two-dimensional and three-dimensional high-resolution numerical large-eddy simulations of planar, miscible Rayleigh-Taylor instability flows are presented. The resolution of the three-dimensional simulation is sufficient to attain a fully turbulent state. A number of different statistics from the mixing region (e.g., growth rates, PDFs, mixedness measures, and spectra) are used to demonstrate that two-dimensional flow simulations differ substantially from the three-dimensional one. It is found that the two-dimensional flow grows more quickly than its three-dimensional counterpart at late times, develops larger structures, and is much less well mixed. These findings are consistent with the concept of inverse cascade in two-dimensional flow, as well as the influence of a reduced effective Atwood number on miscible flow.
Date:
February 23, 2006
Creator:
Cabot, W
Object Type:
Article
System:
The UNT Digital Library
[Deborah, Mary, and Sue at podium]
A photograph of Deborah Leliaert, Mary Finley, and Sue Young at a podium during the Equity and Diversity Conference at UNT. Leliaert and Young have their arms around Finley who is standing between them and there is a fake tree visible behind them.
Date:
February 23, 2006
Creator:
University of North Texas. Multicultural Center.
Object Type:
Photograph
System:
The UNT Digital Library
Definitions of Insurance and Related Information
Correspondence issued by the Government Accountability Office with an abstract that begins "This letter concerns a variety of issues related to identifying a universal definition of insurance and the challenges associated with doing so. We briefed congressional staff on the preliminary results of our work on June 24, 2005, and on our final results on November 29, 2005. Specifically, we provided information on (1) the elements that are commonly part of definitions of insurance, (2) a few products not universally defined as insurance or regulated across the states by their insurance departments, (3) possible regulatory implications of developing separate definitions for insurance products covering insurance risks in more than one category, (4) current developments in statutory and financial accounting communities in re-evaluating their guidelines for measuring risk transfer in reinsurance contracts, and (5) certain circumstances when finite risk contracts are used."
Date:
February 23, 2006
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Double Retort System for Materials Compatibility Testing
With Naval Reactors (NR) approval of the Naval Reactors Prime Contractor Team (NRPCT) recommendation to develop a gas cooled reactor directly coupled to a Brayton power conversion system as the Space Nuclear Power Plant (SNPP) for Project Prometheus (References a and b) there was a need to investigate compatibility between the various materials to be used throughout the SNPP. Of particular interest was the transport of interstitial impurities from the nickel-base superalloys, which were leading candidates for most of the piping and turbine components to the refractory metal alloys planned for use in the reactor core. This kind of contamination has the potential to affect the lifetime of the core materials. This letter provides technical information regarding the assembly and operation of a double retort materials compatibility testing system and initial experimental results. The use of a double retort system to test materials compatibility through the transfer of impurities from a source to a sink material is described here. The system has independent temperature control for both materials and is far less complex than closed loops. The system is described in detail and the results of three experiments are presented.
Date:
February 23, 2006
Creator:
Munne, V. & Carelli, E. V.
Object Type:
Report
System:
The UNT Digital Library
[Dr. Paul Leung and B. D. Wong on stage]
A photograph of RSWA professor Dr. Paul Leung and actor B. D. Wong during the Equity and Diversity Conference at UNT. Leung is standing behind a podium and Wong is sitting on a stool with his legs crossed under him. They are both looking out to the audience.
Date:
February 23, 2006
Creator:
University of North Texas. Multicultural Center.
Object Type:
Photograph
System:
The UNT Digital Library
[Dr. Paul Leung and B. D. Wong together on stage]
A photograph of RSWA professor Dr. Paul Leung and actor B. D. Wong during the Equity and Diversity Conference at UNT. Leung is standing behind a podium and Wong is sitting on a stool with his legs crossed under him. They are both looking out to the audience.
Date:
February 23, 2006
Creator:
University of North Texas. Multicultural Center.
Object Type:
Photograph
System:
The UNT Digital Library
The Dublin Citizen (Dublin, Tex.), Vol. 16, No. 26, Ed. 1 Thursday, February 23, 2006
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
February 23, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Electra Star-News (Electra, Tex.), Vol. 99, No. 28, Ed. 1 Thursday, February 23, 2006
Weekly newspaper from Electra, Texas that includes local, state, and national news along with advertising.
Date:
February 23, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Emergency Preparedness and Response: Some Issues and Challenges Associated with Major Emergency Incidents
Testimony issued by the Government Accountability Office with an abstract that begins "This testimony discusses the challenges of effective emergency preparedness for, response to, and recovery from major emergencies, including catastrophic incidents. Effective emergency preparedness and response for major events requires the coordinated planning and actions of multiple players from multiple first responder disciplines, jurisdictions, and levels of government as well as nongovernmental entities. Effective emergency preparedness and response requires putting aside parochialism and working together prior to and after an emergency incident. September 11, 2001 fundamentally changed the context of emergency management preparedness in the United States, including federal involvement in preparedness and response. The biggest challenge in emergency preparedness is getting effective cooperation in planning, exercises, and capability assessment and building across first responder disciplines and intergovernmental lines. DHS has developed several policy documents designed to define the federal government's role in supporting state and local first responders in emergencies, implement a uniform incident command structure across the nation, and identify performance standards that can be used in assessing state and local first responder capabilities. Realistic exercises are a key component of testing and assessing emergency plans and first responder capabilities, and the Hurricane PAM planning exercise demonstrated …
Date:
February 23, 2006
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Ensemble: 2006-02-23 – One O'Clock Lab Band
Access:
Use of this item is restricted to the UNT Community
Jazz concert performed at the UNT College of Music Winspear Hall.
Date:
February 23, 2006
Creator:
One O'Clock Lab Band
Object Type:
Sound
System:
The UNT Digital Library
The Exon-Florio National Security Test for Foreign Investment
The proposed acquisition of major operations in six major U.S. ports by Dubai Ports World and of Unocal by the China National Offshore Oil Corporation sparked intense concerns among some Members of Congress and the public and has reignited the debate over what role foreign acquisitions play in U.S. national security. The United States actively promotes internationally the national treatment of foreign firms. Several Members of Congress have introduced various measures during the 2nd Session of the 109th Congress that can be grouped into four major areas: those that deal specifically with the proposed Dubai Ports World acquisition; those that focus more generally on foreign ownership of U.S. ports; those that would amend the CFIUS process; and those that would amend the Exon-Florio process.
Date:
February 23, 2006
Creator:
Jackson, James K.
Object Type:
Report
System:
The UNT Digital Library