40 Matching Results

Search Results

Results: 1 - 24 next
open access

Latin America and the Caribbean: Fact Sheet on Leaders and Elections

Description: This fact sheet tracks the current heads of government in Central and South America, Mexico, and the Caribbean. It provides the dates of the last and next elections for the head of government and the national independence date for each country.
Date: June 2, 2010
Creator: Gomez-Granger, Julissa & Sullivan, Mark P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Haitian Economy and the HOPE Act

Description: In December 2006, the 109th Congress passed the Haitian Hemispheric Opportunity through Partnership Encouragement Act of 2006 (HOPE I) to assist Haiti with expanding its apparel trade as a way to help stimulate economic growth and employment. This report analyzes the evolution of the HOPE Act as it relates to U.S. trade policy, the Haitian economy, and post-earthquake reconstruction efforts.
Date: June 2, 2010
Creator: Hornbeck, J. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Deuterium Retention in NSTX with Lithium Conditioning

Description: High (≈ 90%) deuterium retention was observed in NSTX gas balance measurements both withand without lithiumization of the carbon plasma facing components. The gas retained in ohmic discharges was measured by comparing the vessel pressure rise after a discharge to that of a gasonly pulse with the pumping valves closed. For neutral beam heated discharges the gas input and gas pumped by the NB cryopanels were tracked. The discharges were followed by outgassing of deuterium that reduced the retenti… more
Date: June 2, 2010
Creator: C.H. Skinner, J.P. Allain, W. Blanchard, H.W. Kugel, R. Maingi, L. Roquemore, V. Soukhanovskii, C.N. Taylor
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Dependence of Band Renormalization Effect on the Number of Copper-oxide Layers in Tl-based Copper-oxide Superconductor using Angle-resolved Photoemission Spectroscopy

Description: Here we report the first angle-resolved photoemission measurement on nearly optimally doped multilayer Tl-based superconducting cuprates (Tl-2212 and Tl-1223) and a comparison study to single-layer (Tl-2201) compound. A kink in the band dispersion is found in all three compounds but exhibits different momentum dependence for the single-layer and multilayer compounds, reminiscent to that of Bi-based cuprates. This layer number dependent renormalization effect strongly implies that the spin-reson… more
Date: June 2, 2010
Creator: Lee, Wei-Sheng
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Nodal Quasiparticle in Pseudogapped Colossal Magnetoresistive Manganites

Description: A characteristic feature of the copper oxide high-temperature superconductors is the dichotomy between the electronic excitations along the nodal (diagonal) and antinodal (parallel to the Cu-O bonds) directions in momentum space, generally assumed to be linked to the d-wave symmetry of the superconducting state. Angle-resolved photoemission measurements in the superconducting state have revealed a quasiparticle spectrum with a d-wave gap structure that exhibits a maximum along the antinodal dir… more
Date: June 2, 2010
Creator: Mannella, N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Fingerprinting Communication and Computation on HPC Machines

Description: How do we identify what is actually running on high-performance computing systems? Names of binaries, dynamic libraries loaded, or other elements in a submission to a batch queue can give clues, but binary names can be changed, and libraries provide limited insight and resolution on the code being run. In this paper, we present a method for"fingerprinting" code running on HPC machines using elements of communication and computation. We then discuss how that fingerprint can be used … more
Date: June 2, 2010
Creator: Peisert, Sean
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Open Automated Demand Response Technologies for Dynamic Pricing and Smart Grid

Description: We present an Open Automated Demand Response Communications Specifications (OpenADR) data model capable of communicating real-time prices to electricity customers. We also show how the same data model could be used to for other types of dynamic pricing tariffs (including peak pricing tariffs, which are common throughout the United States). Customers participating in automated demand response programs with building control systems can respond to dynamic prices by using the actual prices as input… more
Date: June 2, 2010
Creator: Ghatikar, Girish; Mathieu, Johanna L.; Piette, Mary Ann & Kiliccote, Sila
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Design Report of the Baseline for PEP-X: an Ultra-Low Emittance Storage Ring

Description: Over the past year, we have worked out a baseline design for PEP-X, as an ultra-low emittance storage ring that could reside in the existing 2.2-km PEPII tunnel. The design features a hybrid lattice with double bend achromat (DBA) cells in two arcs and theoretical minimum emittance (TME) cells in the remaining four arcs. Damping wigglers are used to reduce the horizontal emittance to 86 pm-rad at zero current for a 4.5 GeV electron beam. At a design current of 1.5 A, the horizontal emittance in… more
Date: June 2, 2010
Creator: Bane, Karl; Bertsche, Kirk; Cai, Yunhai; Chao, Alex; Corbett, Willian; Fox, John et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Comments on large-N volume independence

Description: We study aspects of the large-N volume independence on R{sup 3} X L{sup {Gamma}}, where L{sup {Gamma}} is a {Gamma}site lattice for Yang-Mills theory with adjoint Wilson-fermions. We find the critical number of lattice sites above which the center-symmetry analysis on L{sup {Gamma}} agrees with the one on the continuum S{sup 1}. For Wilson parameter set to one and {Gamma}{>=}2, the two analyses agree. One-loop radiative corrections to Wilson-line masses are finite, reminiscent of the UV-inse… more
Date: June 2, 2010
Creator: Poppitz, Erich; U., /Toronto; Unsal, Mithat & /SLAC /Stanford U., Phys. Dept.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

IDENTIFICATION OF APPROPRIATE QUALIFICATION TESTING AND END-OF-LIFE WASTE STORAGE CONSIDERATIONS FOR DEEP BED SAND FILTERS

Description: Deep bed sand (DBS) filters have filtered radioactive particulates at two United States Department of Energy (DOE) sites since 1948. Some early DBS filters experienced issues with chemical attack on support tiles, requiring significant repairs. Designs of DBS filters constructed since 1970 paid greater attention to chemical compatibility, resulting in decades of reliable performance since 1975.
Date: June 2, 2010
Creator: Matthews, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

SALTSTONE 1QCY10 TCLP RESULTS

Description: The Saltstone Production Facility (SPF) receives waste from Tank 50H for treatment. In the first quarter of the 2010 calendar year (1QCY10), Tank 50H accepted transfers of approximately 32 kgal from the Effluent Treatment Project (ETP), approximately 10 kgal from Tank 710 - the H-Canyon General Purpose Evaporator, approximately 32 kgal from the H-Canyon Super Kukla campaign, and approximately 26 kgal from the Modular Caustic Side Solvent Extraction Unit (MCU) Decontaminated Salt Solution Hold T… more
Date: June 2, 2010
Creator: Reigel, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Identification of the Charge Carriers in Cerium Phosphate Ceramics

Description: The total conductivity of Sr-doped cerium orthophosphate changes by nearly two orders of magnitude depending on the oxygen and hydrogen content of the atmosphere. The defect model for the system suggests that this is because the identity of the dominant charge carrier can change from electron holes to protons when the sample is in equilibrium with air vs. humidified hydrogen. In this work are presented some preliminary measurements that can help to clarify this exchange between carriers. The co… more
Date: June 2, 2010
Creator: Ray, Hannah L. & Jonghe, Lutgard C. De
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Transition in Electron Transport in a Cylindrical Hall Thruster

Description: Through the use of high-speed camera and Langmuir probe measurements in a cylindrical Hall thruster, we report the discovery of a rotating spoke of increased plasma density and light emission which correlates with increased electron transport across the magnetic field. As cathode electron emission is increased, a sharp transition occurs where the spoke disappears and electron transport decreases. This suggests that a significant fraction of the electron current might be directed through the spo… more
Date: June 2, 2010
Creator: Parker, J. B.; Raitses, Y. & Fisch, N. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nanoscale Electronic Inhomogeneity in In_2Se_3 Nanoribbons Revealed by Microwave Impedance Microscopy

Description: Driven by interactions due to the charge, spin, orbital, and lattice degrees of freedom, nanoscale inhomogeneity has emerged as a new theme for materials with novel properties near multiphase boundaries. As vividly demonstrated in complex metal oxides and chalcogenides, these microscopic phases are of great scientific and technological importance for research in hightemperature superconductors, colossal magnetoresistance effect, phase-change memories, and domain switching operations. Direct ima… more
Date: June 2, 2010
Creator: Lai, K.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Theory of Fano Resonances in Graphene: The Kondo effect probed by STM

Description: We consider the theory of Kondo effect and Fano factor energy dependence for magnetic impurity (Co) on graphene. We have performed a first principles calculation and find that the two dimensional E{sub 1} representation made of d{sub xz}, d{sub yz} orbitals is likely to be responsible for the hybridization and ultimately Kondo screening for cobalt on graphene. There are few high symmetry sites where magnetic impurity atom can be adsorbed. For the case of Co atom in the middle of hexagon of carb… more
Date: June 2, 2010
Creator: Wehling, T.O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Annealing a Follow-up Program: Improvement of the Dark Energy Figure of Merit for Optical Galaxy Cluster Surveys

Description: The precision of cosmological parameters derived from galaxy cluster surveys is limited by uncertainty in relating observable signals to cluster mass. We demonstrate that a small mass-calibration follow-up program can significantly reduce this uncertainty and improve parameter constraints, particularly when the follow-up targets are judiciously chosen. To this end, we apply a simulated annealing algorithm to maximize the dark energy information at fixed observational cost, and find that optimal… more
Date: June 2, 2010
Creator: Wu, Hao-Yi; Rozo, Eduardo & Wechsler, Risa H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

FINITE ELEMENT ANALYSIS OF BULK TRITIUM SHIPPING PACKAGE

Description: The Bulk Tritium Shipping Package was designed by Savannah River National Laboratory. This package will be used to transport tritium. As part of the requirements for certification, the package must be shown to meet the scenarios of the Hypothetical Accident Conditions (HAC) defined in Code of Federal Regulations Title 10 Part 71 (10CFR71). The conditions include a sequential 30-foot drop event, 30-foot dynamic crush event, and a 40-inch puncture event. Finite Element analyses were performed to … more
Date: June 2, 2010
Creator: Jordan, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

ARPES studies of the electronic structure of LaOFe(P,As)

Description: We report a comparison study of LaOFeP and LaOFeAs, two parent compounds of recently discovered iron-pnictide superconductors, using angle-resolved photoemission spectroscopy. Both systems exhibit some common features that are very different from well-studied cuprates. In addition, important differences have also been observed between these two ferrooxypnictides. For LaOFeP, quantitative agreement can be found between our photoemission data and the LDA band structure calculations, suggesting th… more
Date: June 2, 2010
Creator: Analytis, J.G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Hierarchy of Electronic Properties of Chemically Derived and Pristine Graphene Probed by Microwave Imaging

Description: Local electrical imaging using microwave impedance microscope is performed on graphene in different modalities, yielding a rich hierarchy of the local conductivity. The low-conductivity graphite oxide and its derivatives show significant electronic inhomogeneity. For the conductive chemical graphene, the residual defects lead to a systematic reduction of the microwave signals. In contrast, the signals on pristine graphene agree well with a lumped-element circuit model. The local impedance infor… more
Date: June 2, 2010
Creator: Kundhikanjana, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Doping dependence of the coupling of electrons to bosonic modes in the single-layer high-temperature Bi2Sr2CuO6 superconductor

Description: A recent highlight in the study of high-Tc superconductors is the observation of band renormalization or self-energy effects on the quasiparticles. This is seen in the form of kinks in the quasiparticle dispersions as measured by photoemission and interpreted as signatures of collective bosonic modes coupling to the electrons. Here we compare for the first time the self-energies in an optimally doped and strongly overdoped, nonsuperconducting single-layer Bi-cuprate (Bi{sub 2}Sr{sub 2}CuO{sub 6… more
Date: June 2, 2010
Creator: Meevasana, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

All Metal Iron Core For A Low Aspect Ratio Tokamak

Description: A novel concept for incorporating a iron core transformer within a axisymmetric toroidal plasma containment device with a high neutron flux is described. This design enables conceptual design of low aspect ratio devices which employ standard transformer-driven plasma startup by using all-metal high resistance separators between the toroidal field windings. This design avoids the inherent problems of a multiturn air core transformer which will inevitably suffer from strong neutron bombardment an… more
Date: June 2, 2010
Creator: Gates, D. A.; Jun, C.; Zatz, I. & Zolfaghari, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

STM imaging of electronic waves on the surface of Bi2Te3: topologically protected surface states and hexagonal warping effects

Description: Scanning tunneling spectroscopy studies on high-quality Bi{sub 2}Te{sub 3} crystals exhibit perfect correspondence to ARPES data, hence enabling identification of different regimes measured in the local density of states (LDOS). Oscillations of LDOS near a step are analyzed. Within the main part of the surface band oscillations are strongly damped, supporting the hypothesis of topological protec- tion. At higher energies, as the surface band becomes concave, oscillations appear which disperse w… more
Date: June 2, 2010
Creator: Alpichshev, Zhanybek; /SIMES, Stanford /SLAC /Stanford U., Phys. Dept.; Analytis, J. G.; /SIMES, Stanford /SLAC /Stanford U., Phys. Dept.; Chu, J. H.; Fisher, I. R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Unconventional Electronic Reconstruction in Undoped (Ba,Sr)Fe2As2 Across the Spin Density Wave Transition

Description: Through a systematic high-resolution angle-resolved photoemission study of the iron pnictide compounds (Ba,Sr)Fe{sub 2}As{sub 2}, we show that the electronic structures of these compounds are significantly reconstructed across the spin density wave transition, which cannot be described by a simple folding scenario of conventional density wave ordering. Moreover, we find that LDA calculations with an incorporated suppressed magnetic moment of 0.5{mu}{sub B} can match well the details in the reco… more
Date: June 2, 2010
Creator: Yi, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen