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Year
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Day
Accessing tri-gluon correlations in the nucleon via the singlespin asymmetry in open charm production
We calculate the single transverse-spin asymmetry for open charm production in pp collisions within the QCD collinear factorization approach. We include contributions from both twist-three quark-gluon and tri-gluon correlation functions. We find that the quark-gluon correlation functions alone generate only a very small asymmetry for open charm production in the kinematic region of current interest at RHIC, so that the observation of any significant single-spin asymmetry would be a clear indication of the presence of tri-gluon correlations inside a polarized proton. We furthermore demonstrate that the tri-gluon contribution could be very different for the production of D and \bar{D} mesons. These features make the single spin asymmetry in open charm production in polarized pp collisions at RHIC an excellent probe of tri-gluon correlation functions.
Date:
November 14, 2008
Creator:
Kang, Zhong-Bo; Qiu, Jian-Wei; Vogelsang, Werner & Yuan, Feng
Object Type:
Article
System:
The UNT Digital Library
Unconventional Magnetism in Low Carrier Density Systems and Nanoparticle Composites
Under the auspices of this funding, we have developed a program to synthesize and characterize highly monodispersed magnetic nanoparticles. We have been particularly interested in the origin of the exchange bias effect, which occurs in compound nanoparticles with a ferromagnetic core and an antiferromagnetic shell, and have mostly focused on Co/CoO core-shell nanoparticles. The exchange bias effect involves exchange coupling between the core moment and the antiferromagnetic shell which stabilizes the core moment, which would otherwise be quickly reorienting in ferromagnetic particles of this size.
Date:
June 14, 2008
Creator:
Aronson, Meigan C
Object Type:
Report
System:
The UNT Digital Library
TRITIUM AGING EFFECTS ON THE FRACTURE TOUGHNESS PROPERTIES OF FORGED STAINLESS STEEL
The fracture toughness properties of Type 21-6-9 stainless steel were measured for forgings in the unexposed, hydrogen-exposed, and tritium-exposed-and-aged conditions. Fracture toughness samples were cut from conventionally-forged and high-energy-rate-forged forward-extruded cylinders and mechanically tested at room temperature using ASTM fracture-toughness testing procedures. Some of the samples were exposed to either hydrogen or tritium gas (340 MPa, 623 K) prior to testing. Tritium-exposed samples were aged for up to seven years and tested periodically in order to measure the effect on fracture toughness of {sup 3}He from radioactive tritium decay. The results show that hydrogen-exposed and tritium-exposed samples had lower fracture- toughness values than unexposed samples and that fracture toughness decreased with increasing decay {sup 3}He content. Forged steels were more resistant to the embrittling effects of tritium and decay {sup 3}He than annealed steels, although their fracture-toughness properties depended on the degree of sensitization that occurred during processing. The fracture process was dominated by microvoid nucleation, growth and coalescence; however, the size and spacing of microvoids on the fracture surfaces were affected by hydrogen and tritium with the lowest-toughness samples having the smallest microvoids and finest spacing.
Date:
April 14, 2008
Creator:
Morgan, M
Object Type:
Article
System:
The UNT Digital Library
Remaining Sites Verification Package for the 1607-F1 Sanitary Sewer System (124-F-1) and the 100-F-26:8 (1607-F1) Sanitary Sewer Pipelines Waste Sites, Waste Site Reclassification Form 2005-004
The 100-F-26:8 waste site consisted of the underground pipelines that conveyed sanitary waste water from the 1701-F Gatehouse, 1709-F Fire Station, and the 1720-F Administrative Office to the 1607-F1 septic tank. The site has been remediated and presently exists as an open excavation. In accordance with this evaluation, the verification sampling results support a reclassification of this site to Interim Closed Out. The results of verification sampling demonstrated that residual contaminant concentrations do not preclude any future uses and allow for unrestricted use of shallow zone soils. The results also showed that residual contaminant concentrations are protective of groundwater and the Columbia River.
Date:
March 14, 2008
Creator:
Dittmer, L. M.
Object Type:
Report
System:
The UNT Digital Library
Lessons learned at 208K: Towards Debugging Millions of Cores
Petascale systems will present several new challenges to performance and correctness tools. Such machines may contain millions of cores, requiring that tools use scalable data structures and analysis algorithms to collect and to process application data. In addition, at such scales, each tool itself will become a large parallel application--already, debugging the full Blue-Gene/L (BG/L) installation at the Lawrence Livermore National Laboratory requires employing 1664 tool daemons. To reach such sizes and beyond, tools must use a scalable communication infrastructure and manage their own tool processes efficiently. Some system resources, such as the file system, may also become tool bottlenecks. In this paper, we present challenges to petascale tool development, using the Stack Trace Analysis Tool (STAT) as a case study. STAT is a lightweight tool that gathers and merges stack traces from a parallel application to identify process equivalence classes. We use results gathered at thousands of tasks on an Infiniband cluster and results up to 208K processes on BG/L to identify current scalability issues as well as challenges that will be faced at the petascale. We then present implemented solutions to these challenges and show the resulting performance improvements. We also discuss future plans to meet the debugging …
Date:
April 14, 2008
Creator:
Lee, G L; Ahn, D H; Arnold, D C; de Supinski, B R; Legendre, M; Miller, B P et al.
Object Type:
Article
System:
The UNT Digital Library
Low-Temperature Martensitic and Pressure-Induced Delta to Alpha-Prime Phase Transformations in a Pu-Ga Alloy
None
Date:
March 14, 2008
Creator:
Schwartz, A J; Wall, M A; Farber, D L; Moore, K T & Blobaum, K M
Object Type:
Article
System:
The UNT Digital Library
Solving a million equations
None
Date:
March 14, 2008
Creator:
Decker, D
Object Type:
Report
System:
The UNT Digital Library
Greensheet (Houston, Tex.), Vol. 39, No. 20, Ed. 1 Thursday, February 14, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
February 14, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 174, Ed. 1 Wednesday, May 14, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
May 14, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 434, Ed. 1 Tuesday, October 14, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
October 14, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 21, Ed. 1 Thursday, February 14, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
February 14, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 332, Ed. 1 Thursday, August 14, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
August 14, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 433, Ed. 1 Tuesday, October 14, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
October 14, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 70, Ed. 1 Friday, March 14, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
March 14, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 333, Ed. 1 Thursday, August 14, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
August 14, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 490, Ed. 1 Friday, November 14, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
November 14, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Voting in the Senate: Forms and Requirements
This report provides an overview of the forms and requirements needed in voting in the Senate.
Date:
March 14, 2008
Creator:
Oleszek, Walter
Object Type:
Report
System:
The UNT Digital Library
Port Aransas South Jetty (Port Aransas, Tex.), Vol. 38, No. 33, Ed. 1 Thursday, August 14, 2008
Weekly newspaper from Port Aransas, Texas that includes local, state and national news along with extensive advertising.
Date:
August 14, 2008
Creator:
Judson, Mary Henkel
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 72, Ed. 1 Friday, March 14, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
March 14, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 492, Ed. 1 Friday, November 14, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
November 14, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Optimist (Abilene, Tex.), Vol. 97, No. 24, Ed. 1 Friday, November 14, 2008
Bi-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
November 14, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Ranger (San Antonio, Tex.), Vol. 82, No. 19, Ed. 1 Friday, March 14, 2008
Weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.
Date:
March 14, 2008
Creator:
San Antonio College
Object Type:
Newspaper
System:
The Portal to Texas History
The Wild and Scenic Rivers Act and Federal Water Rights
This report discusses federal authority over water, and federal “reserved” and non-reserved water rights. It discusses water rights under the Wild and Scenic Rivers Act and water rights provisions within specific designations.
Date:
January 14, 2008
Creator:
Brougher, Cynthia
Object Type:
Report
System:
The UNT Digital Library
The Endangered Species Act and Claims of Property Rights “Takings
This report discusses Endangered Species Act (ESA) that has long been one of the major flash points in the “property rights” debate. This report first outlines the ESA provisions most relevant to the act's impacts on private property, then surveys the major ESA-relevant principles of Fifth Amendment takings law, and finally discusses the court decisions adjudicating whether government measures based on the ESA effect a taking of property under the Fifth Amendment.
Date:
January 14, 2008
Creator:
Meltz, Robert
Object Type:
Report
System:
The UNT Digital Library