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Topological change of the Fermi surface in ternary iron-pnictides with reduced c/a ratio: A dHvA study of CaFe2P2
We report a de Haas-van Alphen effect study of the Fermi surface of CaFe{sub 2}P{sub 2} using low temperature torque magnetometry up to 45 T. This system is a close structural analogue of the collapsed tetragonal non-magnetic phase of CaFe{sub 2}As{sub 2}. We find the Fermi surface of CaFe{sub 2}P{sub 2} to differ from other related ternary phosphides in that its topology is highly dispersive in the c-axis, being three-dimensional in character and with identical mass enhancement on both electron and hole pockets ({approx} 1.5). The dramatic change in topology of the Fermi surface suggests that in a state with reduced (c/a) ratio, when bonding between pnictogen layers becomes important, the Fermi surface sheets are unlikely to be nested.
Date:
May 26, 2010
Creator:
Coldea, Amalia I.; Andrew, C. M. J.; U., /Bristol; Analytis, J. G.; /SIMES, Stanford /SLAC /Stanford U., Phys. Dept.; McDonald, R. D. et al.
Object Type:
Article
System:
The UNT Digital Library
EU-U.S. Economic Ties: Framework, Scope, and Magnitude
This report provides background information and analysis of the U.S.-EU economic relationship for Members of the 111th Congress as they contemplate the costs and benefits of closer U.S. economic ties with the EU. It examines the economic and political framework of the relationship and the scope and magnitude of the ties based on data from various sources. In addition, the report analyzes the implications these factors have for U.S. economic policy toward the EU. The report will be revised as events warrant.
Date:
July 26, 2010
Creator:
Cooper, William H.
Object Type:
Report
System:
The UNT Digital Library
Animal Waste and Hazardous Substances: Current Laws and Legislative Issues
The animal sector of agriculture has undergone major changes in the last several decades: organizational changes within the industry to enhance economic efficiency have resulted in larger confined production facilities that often are geographically concentrated. These changes, in turn, have given rise to concerns over the management of animal wastes and potential impact on environmental quality.
Date:
July 26, 2010
Creator:
Copeland, Claudia
Object Type:
Report
System:
The UNT Digital Library
Federal Rulemaking: The Role of the Office of Information and Regulatory Affairs
This report discusses the paperwork Reduction Act of 1980. It also discusses Possible legislative issues involving OIRA.
Date:
January 26, 2010
Creator:
Copeland, Curtis W.
Object Type:
Report
System:
The UNT Digital Library
The Endangered Species Act: A Primer
This report discusses the major provisions of the Endangered Species Act, both domestic and international, and also discusses some of the background issues, such as extinction in general, and the effectiveness of the statute.
Date:
January 26, 2010
Creator:
Corn, M. Lynne; Alexander, Kristina & Buck, Eugene H.
Object Type:
Report
System:
The UNT Digital Library
No Prejudice in Space
We present a summary of recent results obtained from a scan of the 19-dimensional parameter space of the pMSSM and its implications for dark matter searches. We have generated a large set of points in parameter space (which we call 'models') for the 19-parameter CP-conserving pMSSM, where MFV has been assumed. We subjected these models to numerous experimental and theoretical constraints to obtain a set of {approx}68 K models which are consistent with existing data. We attempted to be somewhat conservative in our implementation of these constraints; in particular we only demanded that the relic density of the LSP not be greater than the measured value of {Omega}H{sup 2} for non-baryonic dark matter, rather than assuming that the LSP must account for the entire observed relic density. Examining the properties of the neutralinos in these models, we find that many are relatively pure gauge eigenstates with Higgsinos being the most common, followed by Winos. The relative prevalence of Higgsino and Wino LSPs leads many of our models to have a chargino as nLSP, often with a relatively small mass splitting between this nLSP and the LSP; this has important consequences in both collider and astroparticle phenomenology. We find that, in …
Date:
August 26, 2010
Creator:
Cotta, R. C.; Gainer, J. S.; Hewett, J. L. & Rizzo, T. G.
Object Type:
Article
System:
The UNT Digital Library
'Dynamical Supersymmetry Breaking, with Flavor'
We explore calculable models with low-energy supersymmetry where the flavor hierarchy is generated by quark and lepton compositeness, and where the composites emerge from the same sector that dynamically breaks supersymmetry. The observed pattern of Standard Model fermion masses and mixings is obtained by identifying the various generations with composites of different dimension in the ultraviolet. These 'single-sector' supersymmetry breaking models give rise to various spectra of soft masses which are, in many cases, quite distinct from what is commonly found in models of gauge or gravity mediation. In typical models which satisfy all flavor-changing neutral current constraints, both the first and second generation sparticles have masses of order 20 TeV, while the stop mass is a few TeV. In other cases, all sparticles obtain masses of order a few TeV predominantly from gauge mediation, even though the first two generations are composite.
Date:
August 26, 2010
Creator:
Craig, Nathaniel; Essig, Rouven; Franco, Sebastian; Kachru, Shamit & Torroba, Gonzalo
Object Type:
Article
System:
The UNT Digital Library
Congressional Liaison Offices of Selected Federal Agencies
This list of about 150 congressional liaison offices is intended to help congressional offices in placing telephone calls and addressing correspondence to government agencies. In each case, the information was supplied by the agency itself and is current as of the date of publication. Entries are arranged alphabetically in four sections: legislative branch; judicial branch; executive branch; and agencies, boards, and commissions.
Date:
October 26, 2010
Creator:
Crane-Hirsch, Audrey Celeste
Object Type:
Report
System:
The UNT Digital Library
Senior Recital: 2010-06-26 - Caitlin Cribbs, viola
Access:
Use of this item is restricted to the UNT Community
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Bachelor of Music (BM) degree.
Date:
June 26, 2010
Creator:
Cribbs, Caitlin
Object Type:
Sound
System:
The UNT Digital Library
The House of Representatives Apportionment Formula: An Analysis of Proposals for Change and Their Impact on States
This report examines the methods and formulas used to reapportion seats in the House of Representatives following a Census. Although modern Congresses have rarely considered the issue of the formula used in the calculations, this report describes apportionment options from which Congress could choose and the criteria that each method satisfies.
Date:
August 26, 2010
Creator:
Crocker, Royce
Object Type:
Report
System:
The UNT Digital Library
Effects of Temperature and Contamination on Mpcms Electrodes in 241-Ay-101 and 241-an-107 Tank Waste Simulants
This report documents the results of tests designed to characterize the relationship between temperature and the measured potential of electrodes installed on multi-probe corrosion monitoring systems in waste tanks. This report also documents the results of tests designed to demonstrate the impact of liquid in-leakage into electrode bodies as well as the contamination of primary reference electrodes by diffusion through the electrode tip.
Date:
March 26, 2010
Creator:
Dahl, M. M.; Philo, S. L.; Edgemon, G. L.; Bell, J. L. S. & Moore, C. G.
Object Type:
Report
System:
The UNT Digital Library
EXAMINATION OF SHIPPING PACKAGES 9975-01968, 9975-04353 AND 9975-06870
Three 9975 shipping packages were examined to investigate the non-conforming condition of an axial air gap greater than 1 inch. This condition typically indicates the presence of excess moisture in the fiberboard overpack, and may be accompanied by degradation in the fiberboard properties. In the case of these three packages, no excess moisture was present, and the fiberboard was not visibly degraded. However, the lower fiberboard assembly from 9975-06870 was separated into two pieces. The lead shield from 9975-04353 was heavily corroded, while the shield from 9975-01968 had very little corrosion. In the case of 9975-06870, the shield was covered by a stainless steel sleeve, and the condition of the lead was not observed. No other conditions of concern were observed in these three packages.
Date:
April 26, 2010
Creator:
Daugherty, W.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Harold DeYoung, June 26, 2010
The National Museum of the Pacific War presents an interview with Harold DeYoung. DeYoung joined the Navy around mid-1942. He trained in radio and submarine cable telegraphy. In March of 1945 DeYoung was assigned to replace the cable station in Manila, which had been destroyed by the Japanese. He was discharged in late 1945.
Date:
June 26, 2010
Creator:
DeYoung, Harold
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Harold DeYoung, June 26, 2010
The National Museum of the Pacific War presents an interview with Harold DeYoung. DeYoung joined the Navy around mid-1942. He trained in radio and submarine cable telegraphy. In March of 1945 DeYoung was assigned to replace the cable station in Manila, which had been destroyed by the Japanese. He was discharged in late 1945.
Date:
June 26, 2010
Creator:
DeYoung, Harold
Object Type:
Text
System:
The Portal to Texas History
SXR Continuum Radiation Transmitted Through Metallic Filters: An Analytical Approach To Fast Electron Temperature Measurements
A new set of analytic formulae describes the transmission of soft X-ray (SXR) continuum radiation through a metallic foil for its application to fast electron temperature measurements in fusion plasmas. This novel approach shows good agreement with numerical calculations over a wide range of plasma temperatures in contrast with the solutions obtained when using a transmission approximated by a single-Heaviside function [S. von Goeler, Rev. Sci. Instrum., 20, 599, (1999)]. The new analytic formulae can improve the interpretation of the experimental results and thus contribute in obtaining fast teperature measurements in between intermittent Thomson Scattering data.
Date:
August 26, 2010
Creator:
Delgado-Aparicio, L.; Tritz, K.; Kramer, T.; Stutman, D.; Finkentha, M.; Hill, K. et al.
Object Type:
Report
System:
The UNT Digital Library
Proceedings of RIKEN BNL Research Center Workshop: P- and CP-odd Effects in Hot and Dense Matter
This volume contains the proceedings of the RBRC/CATHIE workshop on 'P- and CP-odd Effects in Hot and Dense Matter' held at the RIKEN-BNL Research Center on April 26-30, 2010. The workshop was triggered by the experimental observation of charge correlations in heavy ion collisions at RHIC, which were predicted to occur due to local parity violation (P- and CP-odd fluctuations) in hot and dense QCD matter. This experimental result excited a significant interest in the broad physics community, inspired a few alternative interpretations, and emphasized the need for a deeper understanding of the role of topology in QCD vacuum and in hot and dense quark-gluon matter. Topological effects in QCD are also closely related to a number of intriguing problems in condensed matter physics, cosmology and astrophysics. We therefore felt that a broad cross-disciplinary discussion of topological P- and CP-odd effects in various kinds of matter was urgently needed. Such a discussion became the subject of the workshop. Specific topics discussed at the workshop include the following: (1) The current experimental results on charge asymmetries at RHIC and the physical interpretations of the data; (2) Quantitative characterization of topological effects in QCD matter including both analytical (perturbative and non-perturbative using …
Date:
April 26, 2010
Creator:
Deshpande, A.; Fukushima, K.; Kharzeev, D.; Warringa, H. & Voloshin, S.
Object Type:
Report
System:
The UNT Digital Library
Faculty Recital: 2010-09-26 - Linda Di Fiore, mezzo-soprano, and Elvia Puccinelli, piano
Access:
Use of this item is restricted to the UNT Community
A faculty recital performed at the UNT College of Music Recital Hall.
Date:
September 26, 2010
Creator:
Di Fiore, Linda
Object Type:
Sound
System:
The UNT Digital Library
'Micromanaging de Sitter holography'
We develop tools to engineer de Sitter vacua with semi-holographic duals, using elliptic fibrations and orientifolds to uplift Freund-Rubin compactifications with CFT duals. The dual brane construction is compact and constitutes a microscopic realization of the dS/dS correspondence, realizing d-dimensional de Sitter space as a warped compactification down to (d-1)-dimensional de Sitter gravity coupled to a pair of large-N matter sectors. This provides a parametric microscopic interpretation of the Gibbons-Hawking entropy. We illustrate these ideas with an explicit class of examples in three dimensions, and describe ongoing work on four-dimensional constructions. The Gibbons-Hawking entropy of the de Sitter horizon [1] invites a microscopic interpretation and a holographic formulation of inflating spacetimes. Much progress was made in the analogous problem in black hole physics using special black holes in string theory whose microstates could be reliably counted, such as those analyzed in [2,3]; this led to the AdS/CFT correspondence [4]. In contrast, a microscopic understanding of the entropy of de Sitter space is more difficult for several reasons including its potential dynamical connections to other backgrounds (metastability), the absence of a non-fluctuating timelike boundary, and the absence of supersymmetry. In this paper, we develop a class of de Sitter constructions in …
Date:
August 26, 2010
Creator:
Dong, Xi; Horn, Bart; /SLAC /Stanford U., Phys. Dept. /Santa Barbara, KITP; Silverstein, Eva; /Santa Barbara, KITP /SLAC /Stanford U., Phys. Dept.; Torroba, Gonzalo et al.
Object Type:
Article
System:
The UNT Digital Library
Extraterritorial Application of American Criminal Law
Crime is ordinarily proscribed, tried, and punished according to the laws of the place where it occurs. American criminal law applies beyond the geographical confines of the United States, however, under certain limited circumstances. A surprising number of federal criminal statutes have extraterritorial application, but prosecutions have been few. This may be because when extraterritorial criminal jurisdiction does exist, practical and legal complications, and sometimes diplomatic considerations, may counsel against its exercise.
Date:
March 26, 2010
Creator:
Doyle, Charles
Object Type:
Report
System:
The UNT Digital Library
[Jazz at the Muse Photograph UNTA_AR0797-160-003-0001]
Photograph taken during a Jazz at the Muse event, featuring Bobby Sparks and Keith Anderson, sponsored by The Black Academy of Arts and Letters in Dallas, Texas.
Date:
April 26, 2010
Creator:
Dukes, Kevin
Object Type:
Photograph
System:
The UNT Digital Library
[Jazz at the Muse Photograph UNTA_AR0797-160-003-0002]
Photograph taken during a Jazz at the Muse event, featuring Bobby Sparks and Keith Anderson, sponsored by The Black Academy of Arts and Letters in Dallas, Texas.
Date:
April 26, 2010
Creator:
Dukes, Kevin
Object Type:
Photograph
System:
The UNT Digital Library
[Jazz at the Muse Photograph UNTA_AR0797-160-003-0003]
Photograph taken during a Jazz at the Muse event, featuring Bobby Sparks and Keith Anderson, sponsored by The Black Academy of Arts and Letters in Dallas, Texas.
Date:
April 26, 2010
Creator:
Dukes, Kevin
Object Type:
Photograph
System:
The UNT Digital Library
[Jazz at the Muse Photograph UNTA_AR0797-160-003-0004]
Photograph taken during a Jazz at the Muse event, featuring Bobby Sparks and Keith Anderson, sponsored by The Black Academy of Arts and Letters in Dallas, Texas.
Date:
April 26, 2010
Creator:
Dukes, Kevin
Object Type:
Photograph
System:
The UNT Digital Library
[Jazz at the Muse Photograph UNTA_AR0797-160-003-0005]
Photograph taken during a Jazz at the Muse event, featuring Bobby Sparks and Keith Anderson, sponsored by The Black Academy of Arts and Letters in Dallas, Texas.
Date:
April 26, 2010
Creator:
Dukes, Kevin
Object Type:
Photograph
System:
The UNT Digital Library