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449 Matching Results
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Diagnostics for the Biased Electrode Experiment on NSTX
A linear array of four small biased electrodes was installed in NSTX in an attempt to control the width of the scrape-off layer (SOL) by creating a strong local poloidal electric field. The set of electrodes were separated poloidally by a 1 cm gap between electrodes and were located slightly below the midplane of NSTX, 1 cm behind the RF antenna and oriented so that each electrode is facing approximately normal to the magnetic field. Each electrode can be independently biased to ±100 volts. Present power supplies limit the current on two electrodes to 30 amps the other two to 10 amps each. The effect of local biasing was measured with a set of Langmuir probes placed between the electrodes and another set extending radially outward from the electrodes, and also by the gas puff imaging diagnostic (GPI) located 1 m away along the magnetic field lines intersecting the electrodes. Two fast cameras were also aimed directly at the electrode array. The hardware and controls of the biasing experiment will be presented and the initial effects on local plasma parameters will be discussed.
Date:
March 20, 2009
Creator:
A.L. Roquemore, S.J. Zweben, C.E. Bush, R. Kaita, R. J. Marsalsa, and R.J. Maqueda
Object Type:
Article
System:
The UNT Digital Library
Search for b0(s) --> mu+ mu- and b0(d) --> mu+ mu- decays in p anti-p collisions at s**(1/2) = 1.96 tev
The authors report on a search for B{sub s}{sup 0} {yields} {mu}{sup +}{mu}{sup -} and B{sub d}{sup 0} {yields} {mu}{sup +}{mu}{sup -} decays in p{bar p} collisions at {radical}s = 1.96 TeV using 171 pb{sup -1} of data collected by the CDF II experiment at the Fermilab Tevatron Collider. The decay rates of these rare processes are sensitive to contributions from physics beyond the Standard Model. One event survives all the selection requirements, consistent with the background expectation. They derive branching ratio limits of {Beta}(B{sub s}{sup 0} {yields} {mu}{sup +}{mu}{sup -}) < 5.8 x 10{sup -7} and {Beta}(B{sub d}{sup 0} {yields} {mu}{sup +}{mu}{sup -}) < 1.5 x 10{sup -7} at 90% confidence level.
Date:
March 20, 2004
Creator:
Acosta, D.
Object Type:
Report
System:
The UNT Digital Library
Extraction of macro-molecule images in cryo-EM micrographs
Advances in Electron Microscopy and single-particle reconstruction have led to results at increasingly high resolutions. This has opened up the possibility of complete automation of single particle reconstruction. Main bottleneck in automation of single particle reconstruction is manual selection of particles in the micrograph. This paper describes a simple but efficient approach for segmentation of particle projections in the micrographs obtained using cryo-electron microscope. Changing the shape of objects to facilitate segmentation from the cluster and reconstructing its actual shape after isolation is successfully attempted. Both low-level and high-level processing techniques are used and the whole process is made automatic. Over 90 percent success in automatic particle picking is achieved. Several areas for improvement and future research directions are discussed.
Date:
March 20, 2003
Creator:
Adiga, Umesha P.S.; Malladi, Ravi & Glaeser, Robert M.
Object Type:
Report
System:
The UNT Digital Library
Finite Cosmology and a CMB Cold Spot
The standard cosmological model posits a spatially flat universe of infinite extent. However, no observation, even in principle, could verify that the matter extends to infinity. In this work we model the universe as a finite spherical ball of dust and dark energy, and obtain a lower limit estimate of its mass and present size: the mass is at least 5 x 10{sup 23}M{sub {circle_dot}} and the present radius is at least 50 Gly. If we are not too far from the dust-ball edge we might expect to see a cold spot in the cosmic microwave background, and there might be suppression of the low multipoles in the angular power spectrum. Thus the model may be testable, at least in principle. We also obtain and discuss the geometry exterior to the dust ball; it is Schwarzschild-de Sitter with a naked singularity, and provides an interesting picture of cosmogenesis. Finally we briefly sketch how radiation and inflation eras may be incorporated into the model.
Date:
March 20, 2006
Creator:
Adler, R. J.; Bjorken, J. D. & Overduin, J.M.
Object Type:
Report
System:
The UNT Digital Library
Trade and the Americas
None
Date:
March 20, 2003
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 12, Ed. 1 Thursday, March 20, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
March 20, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Doctoral Recital: 2006-03-20 – Anthony Allgeier, clarinet
Recital presented at the UNT College of Music Concert Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree
Date:
March 20, 2006
Creator:
Allgeier, Anthony
Object Type:
Sound
System:
The UNT Digital Library
Customer Satisfaction Assessment at the Pacific Northwest National Laboratory
The Pacific Northwest National Laboratory (PNNL) is developing and implementing a customer satisfaction assessment program (CSAP) to assess the quality of research and development provided by the laboratory. We present the customer survey component of the PNNL CSAP. The customer survey questionnaire is composed of 2 major sections, Strategic Value and Project Performance. The Strategic Value section of the questionnaire consists of 5 questions that can be answered with a 5 point Likert scale response. These questions are designed to determine if a project is directly contributing to critical future national needs. The Project Performance section of the questionnaire consists of 9 questions that can be answered with a 5 point Likert scale response. These questions determine PNNL performance in meeting customer expectations. Many approaches could be used to analyze customer survey data. We present a statistical model that can accurately capture the random behavior of customer survey data. The properties of this statistical model can be used to establish a "gold standard'' or performance expectation for the laboratory, and then assess progress. The gold standard is defined from input from laboratory management --- answers to 4 simple questions, in terms of the information obtained from the CSAP customer survey, …
Date:
March 20, 2000
Creator:
Anderson, Dale N. & Sours, Mardell L.
Object Type:
Report
System:
The UNT Digital Library
Coming to Washington, D.C.? Sources of Information on Temporary Housing
This report will introduce a newcomer to the Washington, D.C., metropolitan area to sources of general interest, neighborhoods, housing, and public transportation. The intended audience is congressional staff needing short-term or summer housing, although many of the sources given may also be helpful for those needing more than a three- to six-month lease. Sources suggested are often accessible by their Internet addresses.
Date:
March 20, 2003
Creator:
Anderson, J. Michael
Object Type:
Report
System:
The UNT Digital Library
Department of Defense Fuel Spending, Supply, Acquisition, and Policy
This report discusses various aspects of the Department of Defense's (DOD) fuel consumption and any resulting policy considerations for Congress.
Date:
March 20, 2009
Creator:
Andrews, Anthony
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 106, No. 295, Ed. 1 Sunday, March 20, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 20, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Measurement of the Relative Branching Fractions of Bbar to D/D*/D** l- nubar_l Decays in Events with a Fully Reconstructed B Meson
We determine the relative branching fractions of semileptonic B decays to charmed final states. The measurement is performed on the recoil from a fully reconstructed B meson in a sample of 362 million B{bar B} pairs collected at the {Upsilon}(4S) resonance with the BABAR detector. A simultaneous fit to a set of discriminating variables is performed on a sample of {bar B} {yields} DX{ell}{sup -}{bar {nu}}{sub {ell}} decays to determine the contributions from the different channels.
Date:
March 20, 2007
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Beam Position Monitoring with Cavity Higher Order Modes in the Superconducting Linac FLASH
FLASH (Free Electron Laser in Hamburg) is a user facility for a high intensity VUV-light source [1]. The radiation wavelength is tunable in the range from about 40 to 13 nm by changing the electron beam energy from 450 to 700 MeV. The accelerator is also a test facility for the European XFEL (X-ray Free Electron Laser) to be built in Hamburg [2] and the project study ILC (International Linear Collider) [3]. The superconducting TESLA technology is tested at this facility, together with other accelerator components.
Date:
March 20, 2007
Creator:
Baboi, N.; Molloy, S.; Eddy, N.; Frisch, J.; Hendrickson, L.; Hensler, O. et al.
Object Type:
Article
System:
The UNT Digital Library
Seismic Evaluation of Hydrocarbon Saturation in Deep-Water Reservoirs
The ''Seismic Evaluation of Hydrocarbon Saturation in Deep-Water Reservoirs'' (Grant/Cooperative Agreement DE-FC26-02NT15342) began September 1, 2002. During this second quarter: A Direct Hydrocarbon Indicator (DHI) symposium was held at UH; Current DHI methods were presented and forecasts made on future techniques; Dr. Han moved his laboratory from HARC to the University of Houston; Subcontracts were re-initiated with UH and TAMU; Theoretical and numerical modeling work began at TAMU; Geophysical Development Corp. agreed to provide petrophysical data; Negotiations were begun with Veritas GDC to obtain limited seismic data; Software licensing and training schedules were arranged with Paradigm; and Data selection and acquisition continues. The broad industry symposium on Direct Hydrocarbon Indicators was held at the University of Houston as part of this project. This meeting was well attended and well received. A large amount of information was presented, not only on application of the current state of the art, but also on expected future trends. Although acquisition of appropriate seismic data was expected to be a significant problem, progress has been made. A 3-D seismic data set from the shelf has been installed at Texas A&M University and analysis begun. Veritas GDC has expressed a willingness to provide data in the …
Date:
March 20, 2003
Creator:
Batzle, M.; Han, D-h; Gibson, R. & Djordjevic, O.
Object Type:
Report
System:
The UNT Digital Library
South Texas Catholic (Corpus Christi, Tex.), Vol. 44, No. 6, Ed. 1 Friday, March 20, 2009
Semi-monthly newspaper from Corpus Christi, Texas published by the Diocese of Corpus Christi that includes news of interest to Diocese members along with advertising.
Date:
March 20, 2009
Creator:
Beaton, Paula J.
Object Type:
Newspaper
System:
The Portal to Texas History
Country-of-Origin Labeling for Foods
This report briefly discusses the USDA's FY2006 appropriation, which postpones rules requiring many retailers to provide country-of-origin labeling (COOL) for fresh produce, red meats, and peanuts until September 30, 2008. The report also discusses related legislation.
Date:
March 20, 2006
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
Space Launch Vehicles: Government Activities, Commercial Competition, and Satellite Exports
This report various sides of the debate related to domestic launch services, such as satellite export issues, the development of new launch vehicles by the private sector, and whether tax incentives or loan guarantees should be created for companies attempting to develop lower-cost launch vehicles.
Date:
March 20, 2006
Creator:
Behrens, Carl E.
Object Type:
Report
System:
The UNT Digital Library
X-ray Polarization Measurements at Relativistic Laser Intensities
An effort has been started to measure the short pulse laser absorption and energy partition at relativistic laser intensities up to 10{sup 21} W/cm{sup 2}. Plasma polarization spectroscopy is expected to play an important role in determining fast electron generation and measuring the electron distribution function.
Date:
March 20, 2004
Creator:
Beiersdorfer, P; Shepherd, R; Mancini, R C; Chen, H; Dunn, J; Keenan, R et al.
Object Type:
Article
System:
The UNT Digital Library
NATO's 60th Anniversary Summit
This report provides an overview and analysis of the key issues to be discussed at the North Atlantic Treaty Organization's (NATO) April summit on April 3 and 4, 2009.
Date:
March 20, 2009
Creator:
Belkin, Paul; Ek, Carl; Mages, Lisa & Mix, Derek E.
Object Type:
Report
System:
The UNT Digital Library
Adaptive low Mach number simulations of nuclear flame microphysics
We introduce a numerical model for the simulation of nuclear flames in Type Ia supernovae. This model is based on a low Mach number formulation that analytically removes acoustic wave propagation while retaining the compressibility effects resulting from nuclear burning. The formulation presented here generalizes low Mach number models used in combustion that are based on an ideal gas approximation to the arbitrary equations of state such as those describing the degenerate matter found in stellar material. The low Mach number formulation permits time steps that are controlled by the advective time scales resulting in a substantial improvement in computational efficiency compared to a compressible formulation. We briefly discuss the basic discretization methodology for the low Mach number equations and their implementation in an adaptive projection framework. We present validation computations in which the computational results from the low Mach number model are compared to a compressible code and present an application of the methodology to the Landau-Darrieus instability of a carbon flame.
Date:
March 20, 2003
Creator:
Bell, J. B.; Day, M. S.; Rendleman, C. A.; Woosley, S. E. & Zingale, M. A.
Object Type:
Article
System:
The UNT Digital Library
Dispersion of Extensional and Torsional Waves in Porous Cylinders with Patchy Saturation
Laboratory experiments on wave propagation through saturated and partially saturated porous media have often been conducted on porous cylinders that were initially fully saturated and then allowed to dry while continuing to acquire data on the wave behavior. Since it is known that drying typically progresses from the outside to the inside, a sensible physical model of this process is concentric cylinders having different saturation levels--the simplest example being a fully dry outer cylindrical shell together with a fully wet inner cylinder. We use this model to formulate the equations for wave dispersion in porous cylinders for patchy saturation (i.e., drainage) conditions. In addition to multiple modes of propagation obtained numerically from these dispersion relations, we find two distinct analytical expressions for torsional wave modes.
Date:
March 20, 2002
Creator:
Berryman, J G & Pride, S R
Object Type:
Article
System:
The UNT Digital Library
Military Medical Care Services: Questions and Answers
None
Date:
March 20, 2003
Creator:
Best, Richard A., Jr.
Object Type:
Report
System:
The UNT Digital Library
A Directed Energy System for Defeat of Improvised Explosive Devices and Landmines
We describe a laser system, built in our laboratory at LLNL, that has near-term, effective applications in exposing and neutralizing improvised explosive devices and landmines. We discuss experiments with this laser, demonstrating excavation capabilities and relevant material interactions. Model results are also described.
Date:
March 20, 2006
Creator:
Boley, C.; Fochs, S.; Parker, J.; Rotter, M.; Rubenchik, A. & Yamamoto, R.
Object Type:
Article
System:
The UNT Digital Library
Air Force Aerial Refueling
This report considers the future of the U.S. tanker fleet for aerial refueling.
Date:
March 20, 2007
Creator:
Bolkcom, Christopher
Object Type:
Report
System:
The UNT Digital Library