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452 Matching Results

Start Over Decade 2000-2009 Year 2009 Day 24th

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Results: 1 - 24 of 452 next

(open access)

Transatlantic Regulatory Cooperation: Background and Analysis

This report is intended to serve as an introduction and primer on a complicated, broad, and often highly technical set of issues.

Date: August 24, 2009

Creator: Ahearn, Raymond J.

Object Type: Report

System: The UNT Digital Library

(open access)

Timpson & Tenaha News (Timpson, Tex.), Vol. 28, No. 38, Ed. 1 Thursday, September 24, 2009

Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.

Date: September 24, 2009

Creator: Alexander, Nancy

Object Type: Newspaper

System: The Portal to Texas History

(open access)

Timpson & Tenaha News (Timpson, Tex.), Vol. 29, No. 51, Ed. 1 Thursday, December 24, 2009

Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.

Date: December 24, 2009

Creator: Alexander, Nancy

Object Type: Newspaper

System: The Portal to Texas History

(open access)

Electrical Signal Path Study and Component Assay for the MAJORANA N-Type Segmented Contact Detector

The purpose of the present electrical signal path study is to explore the various issues related to the deployment of highly-segmented low-background Ge detectors for the MAJORANA double-beta decay experiment. A significant challenge is to simultaneously satisfy competing requirements for the mechanical design, electrical readout performance, and radiopurity specifications from the MAJORANA project. Common to all rare search experiments, there is a very stringent limit on the acceptable radioactivity level of all the electronics components involved. Some of the findings are summarized in this report.

Date: February 24, 2009

Creator: Amman, Mark; Bergevin, Marc; Chan, Yuen-Dat; Detwiler, Jason A.; Fujikawa, Brian .; Lesko, Kevin T. et al.

Object Type: Report

System: The UNT Digital Library

(open access)

High quality ZnO:Al transparent conducting oxide films synthesized by pulsed filtered cathodic arc deposition

Aluminum-doped zinc oxide, ZnO:Al or AZO, is a well-known n-type transparent conducting oxide with great potential in a number of applications currently dominated by indium tin oxide (ITO). In this study, the optical and electrical properties of AZO thin films deposited on glass and silicon by pulsed filtered cathodic arc deposition are systematically studied. In contrast to magnetron sputtering, this technique does not produce energetic negative ions, and therefore ion damage can be minimized. The quality of the AZO films strongly depends on the growth temperature while only marginal improvements are obtained with post-deposition annealing. The best films, grown at a temperature of about 200?C, have resistivities in the low to mid 10-4 Omega cm range with a transmittance better than 85percent in the visible part of the spectrum. It is remarkable that relatively good films of small thickness (60 nm) can be fabricated using this method.

Date: April 24, 2009

Creator: Anders, Andre; Lim, Sunnie H.N.; Yu, Kin Man; Andersson, Joakim; Rosen, Johanna; McFarland, Mike et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Characterizing the Properties of Clusters of Galaxies As a Function of Luminosity and Redshift

Abstract: We report the application of the new Monte Carlo method, Smoothed Particle Inference (SPI, described in a pair of companion papers), towards analysis and interpretation of X-ray observations of clusters of galaxies with the XMM-Newton satellite. Our sample consists of publicly available well-exposed observations of clusters at redshifts z > 0.069, totaling 101 objects. We determine the luminosity and temperature structure of the X-ray emitting gas, with the goal to quantify the scatter and the evolution of the L{sub X} - T relation, as well as to investigate the dependence on cluster substructure with redshift. This work is important for the establishment of the potential robustness of mass estimates from X-ray data which in turn is essential towards the use of clusters for measurements of cosmological parameters. We use the luminosity and temperature maps derived via the SPI technique to determine the presence of cooling cores, via measurements of luminosity and temperature contrast. The L{sub X}-T relation is investigated, and we confirm that L{sub X} {proportional_to} T{sup 3}. We find a weak redshift dependence ({proportional_to} (1 + z){sup {beta}{sub LT}}, {beta}{sub LT} = 0.50 {+-} 0.34), in contrast to some Chandra results. The level of dynamical activity is established …

Date: February 24, 2009

Creator: Andersson, K.; Peterson, J. R.; Madejski, G. & Goobar, A.

Object Type: Article

System: The UNT Digital Library

Master's Recital: 2009-02-27 - Nicholas Arbolino, oboe

Access: Use of this item is restricted to the UNT Community

Recital presented at the UNT College of Music Conert Hall in partial fulfillment of the Master of Music (MM) degree.

Date: February 24, 2009

Creator: Arbolino, Nicholas

Object Type: Sound

System: The UNT Digital Library

My InfoQuest and the Handheld Librarian

This presentation discusses My InfoQuest, a service that lets you text a question to a librarian and receive a quick response on your mobile device.

Date: October 24, 2009

Creator: Avery, Elizabeth Fuseler

Object Type: Presentation

System: The UNT Digital Library

(open access)

On the Performance of an Algebraic Multigrid Solver on Multicore Clusters

Algebraic multigrid (AMG) solvers have proven to be extremely efficient on distributed-memory architectures. However, when executed on modern multicore cluster architectures, we face new challenges that can significantly harm AMG's performance. We discuss our experiences on such an architecture and present a set of techniques that help users to overcome the associated problems, including thread and process pinning and correct memory associations. We have implemented most of the techniques in a MultiCore SUPport library (MCSup), which helps to map OpenMP applications to multicore machines. We present results using both an MPI-only and a hybrid MPI/OpenMP model.

Date: November 24, 2009

Creator: Baker, A.; Schulz, M. & Yang, U. M.

Object Type: Article

System: The UNT Digital Library

(open access)

A New Class of Non-Linear, Finite-Volume Methods for Vlasov Simulation

Methods for the numerical discretization of the Vlasov equation should efficiently use the phase space discretization and should introduce only enough numerical dissipation to promote stability and control oscillations. A new high-order, non-linear, finite-volume algorithm for the Vlasov equation that discretely conserves particle number and controls oscillations is presented. The method is fourth-order in space and time in well-resolved regions, but smoothly reduces to a third-order upwind scheme as features become poorly resolved. The new scheme is applied to several standard problems for the Vlasov-Poisson system, and the results are compared with those from other finite-volume approaches, including an artificial viscosity scheme and the Piecewise Parabolic Method. It is shown that the new scheme is able to control oscillations while preserving a higher degree of fidelity of the solution than the other approaches.

Date: November 24, 2009

Creator: Banks, J W & Hittinger, J A

Object Type: Article

System: The UNT Digital Library

(open access)

High Level Trigger Configuration and Handling of Trigger Tables in the CMS Filter Farm

The CMS experiment at the CERN Large Hadron Collider is currently being commissioned and is scheduled to collect the first pp collision data in 2008. CMS features a two-level trigger system. The Level-1 trigger, based on custom hardware, is designed to reduce the collision rate of 40 MHz to approximately 100 kHz. Data for events accepted by the Level-1 trigger are read out and assembled by an Event Builder. The High Level Trigger (HLT) employs a set of sophisticated software algorithms, to analyze the complete event information, and further reduce the accepted event rate for permanent storage and analysis. This paper describes the design and implementation of the HLT Configuration Management system. First experiences with commissioning of the HLT system are also reported.

Date: November 24, 2009

Creator: Bauer, G.; Behrens, U.; Boyer, V.; Branson, J.; Brett, A.; Cano, E. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

First Step Towards a Non-Adiabatic Description of the Fission Process Based on the Generator Coordinate Method

Among the different theoretical approaches able to describe fission, microscopic ones can help us in the understanding of this process, as they have the advantage of describing the nuclear structure and the dynamics in a consistent manner. The sole input of the calculations is the nucleon-nucleon interaction. Such a microscopic time-dependent and quantum mechanical formalism has already been used, based on the Gaussian Overlap Approximation of the Generator Coordinate Method with the adiabatic approximation, to analyze the collective dynamics of low-energy fission in {sup 238}U. However, at higher energies, a few MeV above the barrier, the adiabatic approximation doesn't seem valid anymore. Indeed, manifestations of proton pair breaking have been observed in {sup 238}U and {sup 239}U for an excitation energy of 2.3 MeV above the barrier. Taking the intrinsic excitations into account during the fission process will enable us to determine the coupling between collective and intrinsic degrees of freedom, in particular from saddle to scission. Guidelines of the new formalism under development are presented and some preliminary results on overlaps between non excited and excited states are discussed.

Date: November 24, 2009

Creator: Bernard, R; Goutte, H; Gogny, D; Dubray, N & Lacroix, D

Object Type: Article

System: The UNT Digital Library

(open access)

Intelligence Issues for Congress

None

Date: July 24, 2009

Creator: Best, Richard A. Jr.

Object Type: Report

System: The UNT Digital Library

(open access)

Intelligence Authorization Legislation: Status and Challenges

This report assesses the effects of the absence of intelligence authorization legislation since FY2005. Since FY2005, no annual intelligence authorization bill has been enacted. Although the National Security Act requires intelligence activities to be specifically authorized, this requirement has been satisfied in recent years by one-sentence catch-all provisions in defense appropriations acts authorizing intelligence activities.

Date: February 24, 2009

Creator: Best, Richard A., Jr.

Object Type: Report

System: The UNT Digital Library

(open access)

Polarimeters and Energy Spectrometers for the ILC Beam Delivery System

This article gives an overview of current plans and issues for polarimeters and energy spectrometers in the Beam Delivery System of the ILC. It is meant to serve as a useful reference for the Detector Letter of Intent documents currently being prepared. Concepts for high precision polarization and energy measurements exist. These concepts have resulted in detailed system layouts that are included in the RDR description for the Beam Delivery System. The RDR includes both upstream and downstream polarimeters and energy spectrometers for both beams. This provides needed complementarity and redundancy for achieving the precision required, with adequate control and demonstration of systematic errors. The BDS polarimeters and energy spectrometers need to be a joint effort of the ILC BDS team and the Detector collaborations, with collaboration members responsible for the performance and accuracy of the measurements. Details for this collaboration and assigning of responsibilities remain to be worked out. There is also a demonstrated need for Detector physicists to play an active role in the design and evaluation of accelerator components that impact beam polarization and beam energy capabilities, including the polarized source and spin rotator systems. A workshop was held in 2008 on ILC Polarization and Energy measurements, …

Date: February 24, 2009

Creator: Boogert, S.; Hildreth, M.; Kafer, D.; List, J.; Monig, K.; Moffeit, K. C. et al.

Object Type: Report

System: The UNT Digital Library

(open access)

Uncertainty Quantification Approaches for Advanced Reactor Analyses.

The original approach to nuclear reactor design or safety analyses was to make very conservative modeling assumptions so as to ensure meeting the required safety margins. Traditional regulation, as established by the U. S. Nuclear Regulatory Commission required conservatisms which have subsequently been shown to be excessive. The commission has therefore moved away from excessively conservative evaluations and has determined best-estimate calculations to be an acceptable alternative to conservative models, provided the best-estimate results are accompanied by an uncertainty evaluation which can demonstrate that, when a set of analysis cases which statistically account for uncertainties of all types are generated, there is a 95% probability that at least 95% of the cases meet the safety margins. To date, nearly all published work addressing uncertainty evaluations of nuclear power plant calculations has focused on light water reactors and on large-break loss-of-coolant accident (LBLOCA) analyses. However, there is nothing in the uncertainty evaluation methodologies that is limited to a specific type of reactor or to specific types of plant scenarios. These same methodologies can be equally well applied to analyses for high-temperature gas-cooled reactors and to liquid metal reactors, and they can be applied to steady-state calculations, operational transients, or severe accident …

Date: March 24, 2009

Creator: Briggs, L. L.

Object Type: Report

System: The UNT Digital Library