Silicon Detector Letter of Intent (open access)

Silicon Detector Letter of Intent

This document presents the current status of SiD's effort to develop an optimized design for an experiment at the International Linear Collider. It presents detailed discussions of each of SiD's various subsystems, an overview of the full GEANT4 description of SiD, the status of newly developed tracking and calorimeter reconstruction algorithms, studies of subsystem performance based on these tools, results of physics benchmarking analyses, an estimate of the cost of the detector, and an assessment of the detector R&D needed to provide the technical basis for an optimised SiD.
Date: May 26, 2010
Creator: Aihara, H.; Burrows, P. & Oreglia, M.
Object Type: Report
System: The UNT Digital Library
Fermi surface of SrFe2P2 determined by de Haas-van Alphen effect (open access)

Fermi surface of SrFe2P2 determined by de Haas-van Alphen effect

We report measurements of the Fermi surface (FS) of the ternary iron-phosphide SrFe{sub 2}P{sub 2} using the de Haas-van Alphen effect. The calculated FS of this compound is very similar to SrFe{sub 2}As{sub 2}, the parent compound of the high temperature superconductors. Our data show that the Fermi surface is composed of two electron and two hole sheets in agreement with bandstructure calculations. Several of the sheets show strong c-axis warping emphasizing the importance of three-dimensionality in the non-magnetic state of the ternary pnictides. We find that the electron and hole pockets have a different topology, implying that this material does not satisfy a ({pi},{pi}) nesting condition.
Date: May 26, 2010
Creator: Analytis, J.G.
Object Type: Article
System: The UNT Digital Library
Quantum Oscillations in the Parent pnictide BaFe2As2 : Itinerant Electrons in the Reconstructed State (open access)

Quantum Oscillations in the Parent pnictide BaFe2As2 : Itinerant Electrons in the Reconstructed State

We report quantum oscillation measurements that enable the direct observation of the Fermi surface of the low temperature ground state of BaFe{sub 2}As{sub 2}. From these measurements we characterize the low energy excitations, revealing that the Fermi surface is reconstructed in the antiferromagnetic state, but leaving itinerant electrons in its wake. The present measurements are consistent with a conventional band folding picture of the antiferromagnetic ground state, placing important limits on the topology and size of the Fermi surface.
Date: May 26, 2010
Creator: Analytis, J.G.
Object Type: Article
System: The UNT Digital Library
Mechanics of Individual, Isolated Vortices in a Cuprate Superconductor (open access)

Mechanics of Individual, Isolated Vortices in a Cuprate Superconductor

None
Date: May 26, 2010
Creator: Auslaender, O.M.
Object Type: Article
System: The UNT Digital Library
INDEPENDENT VERIFICATION REVIEW AND SURVEY of the Argonne National Laboratory Building 301 Footprint (open access)

INDEPENDENT VERIFICATION REVIEW AND SURVEY of the Argonne National Laboratory Building 301 Footprint

INDEPENDENT VERIFICATION REVIEW AND SURVEY of the Argonne National Laboratory Building 301 Footprint, Argonne Illinois 5061-SR-01-0
Date: May 26, 2010
Creator: Bailey, E.N.
Object Type: Report
System: The UNT Digital Library
Molecular Assemblies, Genes and Genomics Integrated Efficiently (MAGGIE) (open access)

Molecular Assemblies, Genes and Genomics Integrated Efficiently (MAGGIE)

Final report on MAGGIE. We set ambitious goals to model the functions of individual organisms and their community from molecular to systems scale. These scientific goals are driving the development of sophisticated algorithms to analyze large amounts of experimental measurements made using high throughput technologies to explain and predict how the environment influences biological function at multiple scales and how the microbial systems in turn modify the environment. By experimentally evaluating predictions made using these models we will test the degree to which our quantitative multiscale understanding wilt help to rationally steer individual microbes and their communities towards specific tasks. Towards this end we have made substantial progress towards understanding evolution of gene families, transcriptional structures, detailed structures of keystone molecular assemblies (proteins and complexes), protein interactions, biological networks, microbial interactions, and community structure. Using comparative analysis we have tracked the evolutionary history of gene functions to understand how novel functions evolve. One level up, we have used proteomics data, high-resolution genome tiling microarrays, and 5' RNA sequencing to revise genome annotations, discover new genes including ncRNAs, and map dynamically changing operon structures of five model organisms: For Desulfovibrio vulgaris Hildenborough, Pyrococcus furiosis, Sulfolobus solfataricus, Methanococcus maripaludis and Haiobacterium salinarum …
Date: May 26, 2011
Creator: Baliga, Nitin S.
Object Type: Report
System: The UNT Digital Library
A Twisted Ladder: Relating the Fe Superconductors to the High Tc Cuprates (open access)

A Twisted Ladder: Relating the Fe Superconductors to the High Tc Cuprates

We construct a 2-leg ladder model of an Fe-pnictide superconductor and discuss its properties and relationship with the familiar 2-leg cuprate model. Our results suggest that the underlying pairing mechanism for the Fe-pnictide superconductors is similar to that for the cuprates.
Date: May 26, 2010
Creator: Berg, E.
Object Type: Article
System: The UNT Digital Library
Director of National Intelligence Statutory Authorities: Status and Proposals (open access)

Director of National Intelligence Statutory Authorities: Status and Proposals

This report discusses the Director of National Intelligence (DNI) position created by the Intelligence Reform and Terrorism Prevention Act of 2004 (P.L. 108-458). It includes an overview of the authorities granted to the DNI by legislation in 2004 and later as well as the varying opinions of Congress regarding new DNI authorities, as well as related legislation from FY2010 through FY2012.
Date: May 26, 2010
Creator: Best, Richard A., Jr. & Cumming, Alfred
Object Type: Report
System: The UNT Digital Library
House and Senate Chaplains: An Overview (open access)

House and Senate Chaplains: An Overview

This report provides an overview of the House and Senate chaplains.
Date: May 26, 2011
Creator: Brudnick, Ida A.
Object Type: Report
System: The UNT Digital Library
Financial Regulatory Reform: Consumer Financial Protection Proposals (open access)

Financial Regulatory Reform: Consumer Financial Protection Proposals

This report provides a brief summary of the Consumer Financial Protection Agency Act of 2009 (the CFPA Act or the Act) and delineates some of the substantive differences between it and H.R. 4173, Title IV, as it passed the House, and S. 3217, Title X, as it passed the Senate. It then analyzes some of the policy implications of the proposal, focusing on the separation of safety and soundness regulation from consumer protection, financial innovation, and the scope of regulation. The report then raises some questions regarding state law preemption, sources of funding, and rulemaking procedures that the Act does not fully answer.
Date: May 26, 2010
Creator: Carpenter, David H. & Jickling, Mark
Object Type: Report
System: The UNT Digital Library
Quantum Oscillation Studies of the Fermi Surface of LaFePO (open access)

Quantum Oscillation Studies of the Fermi Surface of LaFePO

We review recent experimental measurements of the Fermi surface of the iron-pnictide superconductor LaFePO using quantum oscillation techniques. These studies show that the Fermi surface topology is close to that predicted by first principles density functional theory calculations, consisting of quasi-twodimensional electron-like and hole-like sheets. The total volume of the two hole sheets is almost equal to that of the two electron sheets, and the hole and electron Fermi surface sheets are close to a nesting condition. No evidence for the predicted three dimensional pocket arising from the Fe d{sub z}{sup 2} band is found. Measurements of the effective mass suggest a renormalisation of around two, close to the value for the overall band renormalisation found in recent angle resolved photoemission measurements.
Date: May 26, 2010
Creator: Carrington, A.
Object Type: Article
System: The UNT Digital Library
Army Corps of Engineers Water Resource Projects: Authorization and Appropriations (open access)

Army Corps of Engineers Water Resource Projects: Authorization and Appropriations

This report summarizes congressional authorization and appropriations processes for the U.S. Army Corps of Engineers. It also discusses agency activities under general authorities.
Date: May 26, 2010
Creator: Carter, Nicole T. & Stern, Charles V.
Object Type: Report
System: The UNT Digital Library
Search for lepton flavor violating decay τ<sup>-</sup> →ℓ<sup>-</sup>ℓ<sup>+</sup>ℓ<sup>-</sup>ℓ = e, μ at BaBar (open access)

Search for lepton flavor violating decay τ<sup>-</sup> →ℓ<sup>-</sup>ℓ<sup>+</sup>ℓ<sup>-</sup>ℓ = e, μ at BaBar

The Standard Model (SM) is one of the most tested and verified physical theories of all time, present experimental observations are consistent with SM expectations. On the other hand SM can not explain many physical observations: the cosmological observations possibly infer the presence of dark matter which is clearly beyond the SM expectations; the SM Higgs model, while explaining the generation of fermion masses, can not explain the hierarchy problem and a non natural fine tuning of SM is needed to cancel out quadratic divergences in the Higgs boson mass. New physics (NP) beyond SM should hence be investigated: rising the energy above NP processes thresholds, and detecting new particles or new effects not predicted by the standard model directly, is one of the possible approaches; another approach is to make precision measurements of well known processes or looking for rare processes which involve higher order contribution from NP processes, this approach need higher luminosities with respect to the previous approach but lower beam energies. Search for Lepton Flavor Violation (LFV) in charged lepton decays is promising: neutrino physics provides indeed a clear and unambiguous evidence of LFV in the neutral lepton sector via mixing processes, which have been observed …
Date: May 26, 2010
Creator: Cervelli, Alberto
Object Type: Thesis or Dissertation
System: The UNT Digital Library
North Korea: U.S. Relations, Nuclear Diplomacy, and Internal Situation (open access)

North Korea: U.S. Relations, Nuclear Diplomacy, and Internal Situation

This report provides background information on the nuclear negotiations over North Korea's nuclear weapons program that began in the early 1990s under the Clinton Administration. It also provides information on other concerns that the U.S. has with North Korea, and discusses U.S. engagement activities with North Korea.
Date: May 26, 2010
Creator: Chanlett-Avery, Emma & Taylor, Mi Ae
Object Type: Report
System: The UNT Digital Library
Monitoring Spent or Reprocessed Nuclear Fuel Using Fast Neutrons (open access)

Monitoring Spent or Reprocessed Nuclear Fuel Using Fast Neutrons

None
Date: May 26, 2011
Creator: Chapline, G F; Nakae, L F; Snyderman, N; Verbeke, J M & Wurtz, R
Object Type: Article
System: The UNT Digital Library
Automatic Thread-Level Parallelization in the Chombo AMR Library (open access)

Automatic Thread-Level Parallelization in the Chombo AMR Library

The increasing on-chip parallelism has some substantial implications for HPC applications. Currently, hybrid programming models (typically MPI+OpenMP) are employed for mapping software to the hardware in order to leverage the hardware?s architectural features. In this paper, we present an approach that automatically introduces thread level parallelism into Chombo, a parallel adaptive mesh refinement framework for finite difference type PDE solvers. In Chombo, core algorithms are specified in the ChomboFortran, a macro language extension to F77 that is part of the Chombo framework. This domain-specific language forms an already used target language for an automatic migration of the large number of existing algorithms into a hybrid MPI+OpenMP implementation. It also provides access to the auto-tuning methodology that enables tuning certain aspects of an algorithm to hardware characteristics. Performance measurements are presented for a few of the most relevant kernels with respect to a specific application benchmark using this technique as well as benchmark results for the entire application. The kernel benchmarks show that, using auto-tuning, up to a factor of 11 in performance was gained with 4 threads with respect to the serial reference implementation.
Date: May 26, 2011
Creator: Christen, Matthias; Keen, Noel; Ligocki, Terry; Oliker, Leonid; Shalf, John; Van Straalen, Brian et al.
Object Type: Report
System: The UNT Digital Library
Topological change of the Fermi surface in ternary iron-pnictides with reduced c/a ratio: A dHvA study of CaFe2P2 (open access)

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
The Help America Vote Act and Elections Reform: Overview and Issues (open access)

The Help America Vote Act and Elections Reform: Overview and Issues

This report provides an overview of the Help America Vote Act and Elections reform, including their issues.
Date: May 26, 2011
Creator: Coleman, Kevin J. & Fischer, Eric A.
Object Type: Report
System: The UNT Digital Library
EPA and the Army Corps' Proposed "Waters of the United States" Rule: Congressional Response and Options (open access)

EPA and the Army Corps' Proposed "Waters of the United States" Rule: Congressional Response and Options

This report discusses four legislative options that Congress could consider to halt or redirect the Environmental Protection Agency and the Army Corps of Engineer's proposed "waters of the United States" rule: the Congressional Review Act, appropriations bill limitations, targeted legislation, and broad amendments to the Clean Water Act. Each option faces a steep path to enactment.
Date: May 26, 2015
Creator: Copeland, Claudia
Object Type: Report
System: The UNT Digital Library
QUALIFICATION OF THE SAVANNAH RIVER SITE 252CF SHUFFLER FOR RECEIPT VERIFICATION MEASUREMENTS OF MIXED U-PU OXIDES STORED IN 9975 SHIPPING CONTAINERS (open access)

QUALIFICATION OF THE SAVANNAH RIVER SITE 252CF SHUFFLER FOR RECEIPT VERIFICATION MEASUREMENTS OF MIXED U-PU OXIDES STORED IN 9975 SHIPPING CONTAINERS

To extend their ability to perform accountability and verification measurements of {sup 235}U in a U-Pu oxide matrix, the K-Area Material Storage facility commissioned the development and construction of a Passive/Active {sup 252}Cf Shuffler. A series of {sup 252}Cf, PuO{sub 2}, and U-Pu oxide standards, in addition to a single U{sub 3}O{sub 8} standard, were measured to characterize and calibrate the shuffler. Accompanying these measurements were simulations using MCNP5/MCNPX, aimed at isolating the neutron countrate contributions for each of the isotopes present. Two calibration methods for determining the {sup 235}U content in mixed UPu oxide were then developed, yielding comparable results. The first determines the {sup 235}U mass by estimating the {sup 239}Pu/{sup 235}U ratio-dependent contributions from the primary delayed neutron contributors. The second defines an average linear response based on the {sup 235}U and {sup 239}Pu mass contents. In each case, it was observed that self-shielding due to {sup 235}U mass has a large influence on the observed rates, requiring bounds on the applicable limits of each calibration method.
Date: May 26, 2011
Creator: Dubose, F.
Object Type: Article
System: The UNT Digital Library
State, Foreign Operations and Related Programs: Fiscal Year 2017 Budget and Appropriations (open access)

State, Foreign Operations and Related Programs: Fiscal Year 2017 Budget and Appropriations

This report provides an overview and highlights of the State Department Foreign Operations and Related Appropriations request with an account-by-account comparison of the FY2017 request to the House and Senate committee-passed bills and FY2016 estimates in Appendix A. Appendix B provides the International Affairs 150 function funding levels.
Date: May 26, 2017
Creator: Epstein, Susan B.; Lawson, Marian L. & Gill, Cory R.
Object Type: Report
System: The UNT Digital Library
Surrogate Approaches for Neutron Capture (open access)

Surrogate Approaches for Neutron Capture

None
Date: May 26, 2010
Creator: Escher, J E; Dietrich, F S & Scielzo, N D
Object Type: Article
System: The UNT Digital Library
Plasma Mass Filters For Nuclear Waste Reprocessing (open access)

Plasma Mass Filters For Nuclear Waste Reprocessing

Practical disposal of nuclear waste requires high-throughput separation techniques. The most dangerous part of nuclear waste is the fission product, which contains the most active and mobile radioisotopes and produces most of the heat. We suggest that the fission products could be separated as a group from nuclear waste using plasma mass filters. Plasmabased processes are well suited to separating nuclear waste, because mass rather than chemical properties are used for separation. A single plasma stage can replace several stages of chemical separation, producing separate streams of bulk elements, fission products, and actinoids. The plasma mass filters may have lower cost and produce less auxiliary waste than chemical processing plants. Three rotating plasma configurations are considered that act as mass filters: the plasma centrifuge, the Ohkawa filter, and the asymmetric centrifugal trap.
Date: May 26, 2011
Creator: Fetterman, Abraham J. & Fisch, Nathaniel J.
Object Type: Report
System: The UNT Digital Library
Promoting Global Internet Freedom: Policy and Technology (open access)

Promoting Global Internet Freedom: Policy and Technology

This report provides information about federal and private sector efforts to promote and support global Internet freedom, a description of Internet freedom legislation from the 112th Congress, and suggestions for further reading on this topic. Two appendixes describe censorship and circumvention technologies.
Date: May 26, 2011
Creator: Figliola, Patricia Moloney
Object Type: Report
System: The UNT Digital Library