1,422 Matching Results

Search Results

prev Results: 97 - 120 next
open access

Quantum geometry and gravitational entropy

Description: Most quantum states have wavefunctions that are widely spread over the accessible Hilbert space and hence do not have a good description in terms of a single classical geometry. In order to understand when geometric descriptions are possible, we exploit the AdS/CFT correspondence in the half-BPS sector of asymptotically AdS_5 x S5 universes. In this sector we devise a"coarse-grained metric operator" whose eigenstates are well described by a single spacetime topology and geometry. We s… more
Date: May 29, 2007
Creator: Simon, Joan; Balasubramanian, Vijay; Czech, Bart Iomiej; Larjo, Klaus; Marolf, Donald & Simon, Joan
Partner: UNT Libraries Government Documents Department
open access

Recent Work in Multiphase Flow at NETL

Description: No abstract - only slideshow attached
Date: October 29, 2007
Creator: Syamlal, Madhava
Partner: UNT Libraries Government Documents Department
open access

Rap1 integrates tissue polarity, lumen formation, and tumorigenicpotential in human breast epithelial cells

Description: Maintenance of apico-basal polarity in normal breast epithelial acini requires a balance between cell proliferation, cell death, and proper cell-cell and cell-extracellular matrix signaling. Aberrations in any of these processes can disrupt tissue architecture and initiate tumor formation. Here we show that the small GTPase Rap1 is a crucial element in organizing acinar structure and inducing lumen formation. Rap1 activity in malignant HMT-3522 T4-2 cells is appreciably higher than in S1 cells,… more
Date: September 29, 2006
Creator: Itoh, Masahiko; Nelson, Celeste M.; Myers, Connie A. & Bissell,Mina J.
Partner: UNT Libraries Government Documents Department
open access

PARTNERSHIP FOR THE DEVELOPMENT OF NEXT GENERATION SIMULATION TOOLS TO EVALUATE CEMENTITIOUS BARRIERS AND MATERIALS USED IN NUCLEAR APPLICATION - 8388

Description: The US DOE has initiated a multidisciplinary cross cutting project to develop a reasonable and credible set of tools to predict the structural, hydraulic and chemical performance of cement barriers used in nuclear applications over extended time frames (e.g., > 100 years for operating facilities and > 1000 years for waste management). A partnership that combines DOE, NRC, academia, private sector, and international expertise has been formed to accomplish the project objectives by integrat… more
Date: January 29, 2008
Creator: Langton, C & Richard Dimenna, R
Partner: UNT Libraries Government Documents Department
open access

LIGHT INDUCED TELLURIUM ENRICHMENT ON CDZNTE CRYSTALSURFACES DETECTED BY RAMAN SPECTROSCOPY

Description: Synthetic CdZnTe or 'CZT' crystals can be grown under controlled conditions to produce high quality crystals to be used as room temperature radiation detectors. Even the best crystal growth methods result in defects, such as tellurium secondary phases, that affect the crystal's performance. In this study, CZT crystals were analyzed by micro Raman spectroscopy. The growth of Te rich areas on the surface was induced by low powered lasers. The growth was observed versus time with low power Raman s… more
Date: October 29, 2007
Creator: Hawkins, S; Eliel Villa-Aleman, E; Martine Duff, M & Douglas02 Hunter, D
Partner: UNT Libraries Government Documents Department
open access

Inertial Fusion Energy's Role in Developing the Market for High Power Laser Diodes

Description: Production-cost models for high-power laser-diodes indicate systems of 10GW peak power coupled with facilitization of semi-conductor manufacturing capacity could yield costs below $0.02/Watt. This is sufficient to make IFE competitive with other nuclear power technologies.
Date: November 29, 2007
Creator: Ladran, A. L.; Ault, E. R.; Beach, R. J.; Campbell, J. H.; Erlandson, A. C.; Felker, A. J. et al.
Partner: UNT Libraries Government Documents Department
open access

Modelling of e-cloud build-up in grooved vacuum chambers usingPOSINST

Description: Use of grooved vacuum chambers have been suggested as a wayto limitelectron cloud accumulation in the ILC-DR. We report onsimulations carried out using an augmented version of POSINST, accountingfor e-cloud dynamics in the presence of grooves, and make contact withprevious estimates of an effective secondary electron yield for groovedsurfaces.
Date: June 29, 2007
Creator: Venturini, Marco; Celata, C.; Furman, Miguel; Vay, Jean-Luc & Pivi, Mauro
Partner: UNT Libraries Government Documents Department
open access

Semiconductor Quantum Rods as Single Molecule FluorescentBiological Labels

Description: In recent years, semiconductor quantum dots have beenapplied with great advantage in a wide range of biological imagingapplications. The continuing developments in the synthesis of nanoscalematerials and specifically in the area of colloidal semiconductornanocrystals have created an opportunity to generate a next generation ofbiological labels with complementary or in some cases enhanced propertiescompared to colloidal quantum dots. In this paper, we report thedevelopment of rod shaped semicond… more
Date: May 29, 2006
Creator: Fu, Aihua; Gu, Weiwei; Boussert, Benjamine; Koski, Kristie; Gerion, Daniele; Manna, Liberato et al.
Partner: UNT Libraries Government Documents Department
open access

Solar Resource and Meteorological Assessment Project (SOLRMAP)

Description: The purpose of this collaborative project between NREL and industry is: (1) provide high quality solar measurements in support of deploying Concentrating Solar Thermal projects; and (2) provide NREL with research-quality data sets for refining solar models and developing solar forecasting capabilities. The benefits of this project are: (1) lends NREL credibility to data sets used for economic analyses and commercial justification; (2) helps minimize costly mistakes in estimating capacity and ec… more
Date: October 29, 2008
Creator: Wilcox, S.
Partner: UNT Libraries Government Documents Department
open access

In situ laser heating and radial synchrotron X-ray diffraction ina diamond anvil cell

Description: We report a first combination of diamond anvil cell radialx-ray diffraction with in situ laser heating. The laser-heating setup ofALS beamline 12.2.2 was modified to allow one-sided heating of a samplein a diamond anvil cell with an 80 W yttrium lithium fluoride laser whileprobing the sample with radial x-ray diffraction. The diamond anvil cellis placed with its compressional axis vertical, and perpendicular to thebeam. The laser beam is focused onto the sample from the top while thesample is p… more
Date: June 29, 2007
Creator: Kunz, Martin; Caldwell, Wendel A.; Miyagi, Lowell & Wenk,Hans-Rudolf
Partner: UNT Libraries Government Documents Department
open access

OPTIMIZING RADIOLOGICAL MONITOR SITING OVER THE CONTINENTAL U.S.

Description: The US Environmental Protection Agency (EPA) is installing a network of sensors in the US to monitor background radiation and elevated radiation levels expected from a possible nuclear incident. The network (RadNet) of 180 fixed sensors is intended to provide a basic estimate of the radiation level throughout the US and enhanced accuracy near population centers. This report discusses one of the objective methods for locating these monitors based on criteria outlined by the EPA. The analysis emp… more
Date: October 29, 2007
Creator: Chen, K; Robert Buckley, R; Robert Kurzeja, R; Lance Osteen, L & Saleem Salaymeh, S
Partner: UNT Libraries Government Documents Department
open access

Keck Observations of the 2002-2003 Jovian Ring Plane Crossing

Description: We present new observations of Jupiter's ring system at a wavelength of 2.2 {micro}m obtained with the 10-m W. M. Keck telescopes on three nights during a ring plane crossing: UT 19 December 2002, and 22 and 26 January 2003. We used conventional imaging, plus adaptive optics on the last night. Here we present detailed radial profiles of the main ring, halo and gossamer rings, and interpret the data together with information extracted from radio observations of Jupiter's synchrotron radiation. T… more
Date: November 29, 2007
Creator: de Pater, I.; Showalter, M. R. & Macintosh, B. A.
Partner: UNT Libraries Government Documents Department
open access

Modeling Estimated Personnel Needs for a Potential Foot and Mouth Disease Outbreak

Description: Foot and Mouth disease (FMD) is a highly infectious and contagious viral disease affecting cloven-hoofed livestock that was last detected in the United States (US) in 1929. The prevalence of FMD in other countries, as well as the current potential for this virus to be used as a form of agroterrorism, has made preparations for a potential FMD outbreak a national priority. To assist in the evaluation of national preparedness, all 50 states were surveyed via e-mail, telephone and web search to obt… more
Date: January 29, 2008
Creator: Simmons, K & Hullinger, P
Partner: UNT Libraries Government Documents Department
open access

Comparison of kinetic and equilibrium reaction models insimulating the behavior of porous media

Description: In this study we compare the use of kinetic and equilibriumreaction models in the simulation of gas (methane) hydrate behavior inporous media. Our objective is to evaluate through numerical simulationthe importance of employing kinetic versus equilibrium reaction modelsfor predicting the response of hydrate-bearing systems to externalstimuli, such as changes in pressure and temperature. Specifically, we(1) analyze and compare the responses simulated using both reactionmodels for natural gas pro… more
Date: November 29, 2006
Creator: Kowalsky, Michael B. & Moridis, George J.
Partner: UNT Libraries Government Documents Department
open access

Plasma Performance Improvement with Lithium-Coated Plasma-Facing Components in NSTX

Description: Lithium as a plasma-facing material has many attractive features, including a reduction in the recycling of hydrogenic species and the potential for withstanding high heat and neutron fluxes in fusion reactors. Recent NSTX experiments have shown, for the first time, significant and recurring benefits of lithium coatings on plasma-facing components (PFC's) to the performance of divertor plasmas in both L- and H- mode confinement regimes heated by high-power neutral beams. They included decreases… more
Date: September 29, 2008
Creator: Kaita, R., et. al.
Partner: UNT Libraries Government Documents Department
open access

Calibration of symmetric and non-symmetric errors for interferometry of ultra-precise imaging systems

Description: The azimuthal Zernike coefficients for shells of Zernike functions with shell numbers n<N may be determined by making measurements at N equally spaced rotational positions. However, these measurements do not determine the coefficients of any of the purely radial Zernike functions. Label the circle that the azimuthal Zernikes are measured in as circle A. Suppose that the azimuthal Zernike coefficients for n<N are also measured in a smaller circle B which is inside circle A but offset so th… more
Date: June 29, 2005
Creator: Phillion, D. W.; Sommargren, G. E.; Johnson, M. A.; Decker, T. A.; Taylor, J. S.; Gomie, Y et al.
Partner: UNT Libraries Government Documents Department
open access

A pulsed-laser calibration system for the laser backscatter diagnostics at the Omega laser

Description: A calibration system has been developed that allows a direct determination of the sensitivity of the laser backscatter diagnostics at the Omega laser. A motorized mirror at the target location redirects individual pulses of a mJ-class laser onto the diagnostic to allow the in-situ measurement of the local point response of the backscatter diagnostics. Featuring dual wavelength capability at the 2nd and 3rd harmonic of the Nd:YAG laser, both spectral channels of the backscatter diagnostics can b… more
Date: April 29, 2008
Creator: Neumayer, P.; Sorce, C.; Froula, D. H.; Rekow, V.; Loughman, K.; Knight, R. et al.
Partner: UNT Libraries Government Documents Department
open access

EBIS preinjector construction status

Description: A new heavy ion preinjector is presently under construction at Brookhaven National Laboratory. This preinjector uses an Electron Beam Ion Source (EBIS), and an WQ and IH Linac, both operating at 100.625 MHz, to produce 2 MeV/u ions of any species for use, after further acceleration, at the Relativistic Heavy Ion Collider, and the NASA Space Radiation Laboratory. Among the increased capabilities provided by this preinjector are the ability to produce ions of any species, and the ability to switc… more
Date: September 29, 2008
Creator: Alessi,J.; Barton, D.; Beebe, E.; Bellavia, S.; Gould, O.; Kponou, A. et al.
Partner: UNT Libraries Government Documents Department
open access

THE NEED FOR A NEW JOINING TECHNOLOGY FOR THE CLOSURE WELDING OF RADIOACTIVE MATERIALS CONTAINERS

Description: One of the activities associated with cleanup throughout the Department of Energy (DOE) complex is packaging radioactive materials into storage containers. Much of this work will be performed in high-radiation environments requiring fully remote operations, for which existing, proven systems do not currently exist. These conditions demand a process that is capable of producing acceptable (defect-free) welds on a consistent basis; the need to perform weld repair, under fully-remote operations, c… more
Date: October 29, 2008
Creator: GR, CANNELL; BE, HILL & GJ, GRANT
Partner: UNT Libraries Government Documents Department
open access

Using a Quasipotential Transformation for Modeling Diffusion Media inPolymer-Electrolyte Fuel Cells

Description: In this paper, a quasipotential approach along with conformal mapping is used to model the diffusion media of a polymer-electrolyte fuel cell. This method provides a series solution that is grid independent and only requires integration along a single boundary to solve the problem. The approach accounts for nonisothermal phenomena, two-phase flow, correct placement of the electronic potential boundary condition, and multilayer media. The method is applied to a cathode diffusion medium to explor… more
Date: August 29, 2008
Creator: Weber, Adam Z. & Newman, John
Partner: UNT Libraries Government Documents Department
open access

3D culture models of normal and malignant breast epithelial cells

Description: This report describes a robust and generalized method for the clustering of various human breast cell lines in 3D and describes the preparation of cellular extracts from these cultures for molecular analysis.
Date: December 29, 2006
Creator: Lee, Genee Y.; Kenny, Paraic A.; Lee, Eva H. & Bissell, Mina J.
Partner: UNT Libraries Government Documents Department
open access

Impedance and Single Bunch Instability Calculations for the ILCDamping Ring

Description: An important action item for the damping rings of theInternational Linear Collider (ILC) is to compute the broad-bandimpedance and, from it, the threshold to the microwave instability. Wereport on the status of our study and provide a preliminary estimate ofthe instability threshold based on impedance models developed sofar.
Date: June 29, 2007
Creator: Venturini, Marco; Bane, Karl; Heifets, Sam; Li, Zhenhai; Ng, Cho; Novokhatski, Alexander et al.
Partner: UNT Libraries Government Documents Department
open access

High Relaxivity Gadolinium Hydroxypyridonate-Viral Capsid Conjugates: Nano-sized MRI Contrast Agents

Description: High relaxivity macromolecular contrast agents based on the conjugation of gadolinium chelates to the interior and exterior surfaces of MS2 viral capsids are assessed. The proton nuclear magnetic relaxation dispersion (NMRD) profiles of the conjugates show up to a five-fold increase in relaxivity, leading to a peak relaxivity (per Gd{sup 3+} ion) of 41.6 mM{sup -1}s{sup -1} at 30 MHz for the internally modified capsids. Modification of the exterior was achieved through conjugation to flexible l… more
Date: August 29, 2007
Creator: Meux, Susan C.; Datta, Ankona; Hooker, Jacob M.; Botta, Mauro; Francis, Matthew B.; Aime, Silvio et al.
Partner: UNT Libraries Government Documents Department
open access

On The Electronic Configuration in Pu

Description: X-Ray Absorption Spectroscopy (XAS) and Photoelectron Spectroscopy (PES) have been performed upon highly radioactive samples, particularly Plutonium, at the Advanced Light Source in Berkeley, CA, USA. First results from alpha and delta Plutonium are reported as well as a detailed analysis of sample quality.
Date: January 29, 2007
Creator: Tobin, J G; Soderlind, P; Landa, A; Moore, K T; Schwartz, A J; Chung, B W et al.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen