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2,061 Matching Results
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Using Visualization in Cockpit Decision Support Systems
Beamline 7.2 of the Advanced Light Source (ALS) at the Lawrence Berkeley National Laboratory (LBNL) is a beam diagnostics system that uses the synchrotron radiation emitted by a dipole magnet. It consists of two branches; in the first one the x-ray portion of the radiation is used in a pinhole camera system for measuring the transverse profile of the beam. The second branch is equipped with an x-ray beam position monitor (BPM) and with a multipurpose port where the visible and the far-infrared part of the radiation can be used for various applications such as bunch length measurements and IR coherent synchrotron radiation experiments. The pinhole system has been operating successfully since the end of 2003. The installation of the second branch has been completed recently and the results of its commissioning are presented in this paper together with examples of beam measurements performed at BL 7.2.
Date:
July 1, 2005
Creator:
Aragon, Cecilia R.
Object Type:
Article
System:
The UNT Digital Library
Using Visualization in Cockpit Decision Support Systems
In order to safely operate their aircraft, pilots must makerapid decisions based on integrating and processing large amounts ofheterogeneous information. Visual displays are often the most efficientmethod of presenting safety-critical data to pilots in real time.However, care must be taken to ensure the pilot is provided with theappropriate amount of information to make effective decisions and notbecome cognitively overloaded. The results of two usability studies of aprototype airflow hazard visualization cockpit decision support systemare summarized. The studies demonstrate that such a system significantlyimproves the performance of helicopter pilots landing under turbulentconditions. Based on these results, design principles and implicationsfor cockpit decision support systems using visualization arepresented.
Date:
July 1, 2005
Creator:
Aragon, Cecilia R.
Object Type:
Article
System:
The UNT Digital Library
Using Visual Analytics to Maintain Situation Awareness in Astrophysics
We present a novel collaborative visual analytics application for cognitively overloaded users in the astrophysics domain. The system was developed for scientists needing to analyze heterogeneous, complex data under time pressure, and then make predictions and time-critical decisions rapidly and correctly under a constant influx of changing data. The Sunfall Data Taking system utilizes severalnovel visualization and analysis techniques to enable a team of geographically distributed domain specialists to effectively and remotely maneuver a custom-built instrument under challenging operational conditions. Sunfall Data Taking has been in use for over eighteen months by a major international astrophysics collaboration (the largest data volume supernova search currently in operation), and has substantially improved the operational efficiency of its users. We describe the system design process by an interdisciplinary team, the system architecture, and the results of an informal usability evaluation of the production system by domain experts in the context of Endsley?s three levels of situation awareness.
Date:
July 1, 2008
Creator:
Aragon, Cecilia R.; Poon, Sarah S.; Aldering, Gregory S.; Thomas, Rollin C. & Quimby, Robert
Object Type:
Article
System:
The UNT Digital Library
Optical relative calibration and stability monitoring for the Auger fluorescence detector
The stability of the fluorescence telescopes of the Pierre Auger Observatory is monitored with the optical relative calibration setup. Optical fibers distribute light pulses to three different diffuser groups within the optical system. The total charge per pulse is measured for each pixel and compared with reference calibration measurements. This allows monitoring the short and long term stability with respect of the relative timing between pixels and the relative gain for each pixel. The designs of the LED calibration unit (LCU) and of the Xenon flash lamp used for relative calibration, are described and their capabilities to monitor the stability of the telescope performances are studied. We report the analysis of relative calibration data recorded during 2004. Fluctuations in the relative calibration constants provide a measure of the stability of the FD.
Date:
July 1, 2005
Creator:
Aramo, Carla; Brack, J.; Caruso, R.; D'Urso, D.; Fazio, D.; Fonte, R. et al.
Object Type:
Article
System:
The UNT Digital Library
ES-3100: A New Generation Shipping Container for Bulk Highly Enriched Uranium and Other Fissile Materials
The U.S. Department of Energy (DOE) National Nuclear Security Administration (NNSA) is shipping bulk quantities of surplus fissile materials, primarily highly enriched uranium (HEU), over the next 15 to 20 years for disposition purposes. The U.S. Department of Transportation (DOT) specification 6M container is the package of choice for most of these shipments. However, the 6M does not conform to the Type B packaging requirements in the ''Code of Federal Regulations'' (10CFR71) and, for that reason, is being phased out for use in the secure transportation system of DOE. BWXT Y-12 is currently developing a package to replace the DOT 6M container for HEU disposition shipping campaigns. The new package is based on state-of-the-art, proven, and patented insulation technologies that have been successfully applied in the design of other packages. The new package, designated the ES-3100, will have a 50% greater capacity for HEU than the 6M and will be easier to use. Engineering analysis on the new package includes detailed dynamic impact finite element analysis (FEA). This analysis gives the ES-3100 a high probability of complying with regulatory requirements.
Date:
July 1, 2004
Creator:
Arbital, J.G.; Byington, G.A. & Tousley, D.R.
Object Type:
Article
System:
The UNT Digital Library
ZFITTER: A Semi-analytical program for fermion pair production in e+ e- annihilation, from version 6.21 to version 6.42
ZFITTER is a Fortran program for the calculation of fermion pair production and radiative corrections at high energy e{sup +}e{sup -} colliders; it is also suitable for other applications where electroweak radiative corrections appear. ZFITTER is based on a semi-analytical approach to the calculation of radiative corrections in the Standard Model. They present a summary of new features of the ZFITTER program version 6.42 compared to version 6.21. The most important additions are: (1) some higher-order QED corrections to fermion pair production, (2) electroweak one-loop corrections to atomic parity violation, (3) electroweak one-loop corrections to {bar {nu}}{sub e}{nu}{sub e} production, (4) electroweak two-loop corrections to the W boson mass and the effective weak mixing angle.
Date:
July 1, 2005
Creator:
Arbuzov, A. B.; Awramik, M.; Czakon, M.; Freitas, A.; Grunewald, M. W.; Monig, K. et al.
Object Type:
Article
System:
The UNT Digital Library
Assessing the Efficiency of US Electricity Markets
None
Date:
July 1, 2001
Creator:
Arciniegas, Ismael E.; Barrett, Chris & Marathe, Achla
Object Type:
Article
System:
The UNT Digital Library
The effect of specific anion adsorption on the electrochemical behavior of ultrathin Pd films deposited on Pt(111) in acid solution
None
Date:
July 1, 2002
Creator:
Arenz, M.; Stamenkovic, V.; Schmidt, T.J.; Wandelt, K.; Ross, P.N. & Markovic, N.M.
Object Type:
Article
System:
The UNT Digital Library
Renewable Energy Water Pumping Systems Handbook; Period of Performance: April 1--September 1, 2001
Water is one of the most basic necessities of rural development. This book provides valuable information on how renewable energy technologies can be used for irrigation, livestock watering, and domestic water supplies. This report emphasizes wind and solar energy resources, and hybrid water pumping systems.
Date:
July 1, 2004
Creator:
Argaw, N.
Object Type:
Report
System:
The UNT Digital Library
Renewable Energy for Water Pumping Applications In Rural Villages; Period of Performance: April 1, 2001--September 1, 2001
This report introduces conventional and renewable energy sources for water pumping applications in rural villages by reviewing the technologies and illustrating typical applications. As energy sources for water pumping, the report discusses diesel/gasoline/kerosene engines, grid power supplies, traditional windmills, electrical wind turbines, and PV.
Date:
July 1, 2003
Creator:
Argaw, N.; Foster, R. & Ellis, A.
Object Type:
Report
System:
The UNT Digital Library
Top quark mass and properties at the Tevatron
We present recent analyses of top quark properties performed at Run II of the Tevatron. Measurements of the top quark mass, branching ratios and W boson helicity inside top quark decays are covered.
Date:
July 1, 2005
Creator:
Arguin, Jean-Francois & U., /Toronto
Object Type:
Article
System:
The UNT Digital Library
NOVEL COMPOSITE HYDROGEN-PERMEABLE MEMBRANES FOR NON-THERMAL PLASMA REACTORS FOR THE DECOMPOSITION OF HYDROGEN SULFIDE
The goal of this experimental project is to design and fabricate a reactor and membrane test cell to dissociate hydrogen sulfide (H{sub 2}S) in a non-thermal plasma and recover hydrogen (H{sub 2}) through a superpermeable multi-layer membrane. Superpermeability of hydrogen atoms (H) has been reported by some researchers using membranes made of Group V transition metals (niobium, tantalum, vanadium, and their alloys), although it has yet to be confirmed in this study. Experiments involving methane conversion reactions were conducted with a preliminary pulsed corona discharge reactor design in order to test and improve the reactor and membrane designs using a non-toxic reactant. This report details the direct methane conversion experiments to produce hydrogen, acetylene, and higher hydrocarbons utilizing a co-axial cylinder (CAC) corona discharge reactor, pulsed with a thyratron switch. The reactor was designed to accommodate relatively high flow rates (655 x 10{sup -6} m{sup 3}/s) representing a pilot scale easily converted to commercial scale. Parameters expected to influence methane conversion including pulse frequency, charge voltage, capacitance, residence time, and electrode material were investigated. Conversion, selectivity and energy consumption were measured or estimated. C{sub 2} and C{sub 3} hydrocarbon products were analyzed with a residual gas analyzer (RGA). In order …
Date:
July 1, 2004
Creator:
Argyle, Morris D.; Ackerman, John F.; Muknahallipatna, Suresh; Hamann, Jerry C.; Legowski, Stanislaw; Zhang, Ji-Jun et al.
Object Type:
Report
System:
The UNT Digital Library
Exclusion limits on the WIMP-nucleon cross section from the first run of the Cryogenic Dark Matter Search in the Soudan Underground Laboratory
The Cryogenic Dark Matter Search (CDMS-II) employs low-temperature Ge and Si detectors to seek Weakly Interacting Massive Particles (WIMPs) via their elastic scattering interactions with nuclei. Simultaneous measurements of both ionization and phonon energy provide discrimination against interactions of background particles. For recoil energies above 10 keV, events due to background photons are rejected with > 99.99% efficiency. Electromagnetic events very near the detector surface can mimic nuclear recoils because of reduced charge collection, but these surface events are rejected with > 96% efficiency by using additional information from the phonon pulse shape. Efficient use of active and passive shielding, combined with the 2090 m.w.e. overburden at the experimental site in the Soudan mine, makes the background from neutrons negligible for this first exposure. All cuts are determined in a blind manner from in situ calibrations with external radioactive sources without any prior knowledge of the event distribution in the signal region. Resulting efficiencies are known to {approx}10%. A single event with a recoil of 64 keV passes all of the cuts and is consistent with the expected misidentification rate of surface-electron recoils. Under the assumptions for a standard dark matter halo, these data exclude previously unexplored parameter space for …
Date:
July 1, 2005
Creator:
Armel-Funkhouser, M. S.; /UC, Berkeley; Attisha, M. J.; U., /Case Western Reserve; Bailey, C. N.; U., /Case Western Reserve et al.
Object Type:
Article
System:
The UNT Digital Library
Test results for 320 nm and 390 nm remote sensing sources using a 150 mJ, 100 Hz repetition rate, injection-seeded diode-pumped Nd:YAG slab-laser developed by Coherent Technologies, Inc.
This report describes results of tests using a laser system designed by Coherent Technologies, Inc., in conjunction with Sandia developed nonlinear optics technology. Test results are described for three different optical parametric oscillators built at Sandia. The report concludes with recommendations for future work.
Date:
July 1, 2005
Creator:
Armstrong, Darrell Jewell
Object Type:
Report
System:
The UNT Digital Library
The Hutto Business Update (Hutto, Tex.), Vol. 1, No. 5, Ed. 1 Friday, July 1, 2005
Monthly newsletter focusing on information for and about the business community in Hutto, Texas, along with advertising.
Date:
July 1, 2005
Creator:
Arnett, Mahlon E., II
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Hutto Business Update (Hutto, Tex.), Vol. 2, No. 4, Ed. 1 Saturday, July 1, 2006
Bimonthly newsletter focusing on information for and about the business community in Hutto, Texas, along with advertising.
Date:
July 1, 2006
Creator:
Arnett, Mahlon E., II
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Development of an EMAT in-Line Inspection System for Detection, Discrimination, and Grading of Stress Corrosion Cracking in Pipelines Progress Report
This report describes progress, experiments, and results for a project to develop a pipeline inline inspection tool that uses electromagnetic acoustic transducers (EMATs) to detect and grade stress corrosion cracking (SCC). There is a brief introduction that gives background material about EMATs and relevant previous Tuboscope work toward a tool. This work left various choices about the modes and transducers for this project. The experimental section then describes the lab systems, improvements to these systems, and setups and techniques to narrow the choices. Improvements, which involved transducer matching networks, better magnetic biasing, and lower noise electronics, led to improved signal to noise (SNR) levels. The setups permitted transducer characterizations and interaction measurements in plates with man-made cracks, pipeline sections with SCC, and a full pipe with SCC. The latter were done with a moveable and compact EMAT setup, called a lab mouse, which is detailed. Next, the results section justifies the mode and transducer choices. These were for magnetostrictive EMATs and the use of EMAT launched modes: SH0 (at 2.1 MHz-mm) and SV1 (at 3.9 MHz-mm). This section then gives details of measurements on these modes. The measurements consisted of signal to noise ratio, insertion loss, magnetic biasing sensitivities crack …
Date:
July 1, 2003
Creator:
Aron, Jeff; Jon Gore, Roger Dalton; Eaton, Stuart; Bowles, Adrian; Thomas, Owen & Jarman, Tim
Object Type:
Report
System:
The UNT Digital Library
Measurement of sigma(p anti-p -> t anti-t) in the tau + jets channel by the D� experiment at Run II of the Tevatron Collider
The top quark is the heaviest and most mysterious of the known elementary particles. Therefore, careful study of its production rate and other properties is of utmost importance for modern particle physics. The Tevatron is the only facility currently capable of studying top quark properties by on-shell production. Measurement of the top quark pair production cross section is one of the major goals of the Tevatron Run II physics program. It provides an excellent test of QCD at energies exceeding 100 GeV. We report on a new measurement of p{bar p} {yields} t{bar t} production at {radical} = 1.96 TeV using 350 pb{sup -1} of data collected with the D0 detector between 2002 and 2005. We focus on the final state where a W boson from one of the top quarks decays into a {tau} lepton and its associated neutrino, while the other decays into a quark-antiquark pair. We aim to select those events in which the {tau} lepton subsequently decays to one or three charged hadrons, zero or more neutral hadrons and a tau neutrino (the charge conjugate processes are implied in all of the above). The observable signature thus consists of a narrow calorimeter shower with associated track(s) …
Date:
July 1, 2008
Creator:
Arov, Mikhail
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
COST-EFFECTIVE METHOD FOR PRODUCING SELF SUPPORTED PALLADIUM ALLOY MEMBRANES FOR USE IN EFFICIENT PRODUCTION OF COAL DERIVED HYDROGEN
None
Date:
July 1, 2006
Creator:
Arps, J.
Object Type:
Report
System:
The UNT Digital Library
The Central laser facility at the Pierre Auger Observatory
The Central Laser Facility is located near the middle of the Pierre Auger Observatory in Argentina. It features a UV laser and optics that direct a beam of calibrated pulsed light into the sky. Light scattered from this beam produces tracks in the Auger optical detectors which normally record nitrogen fluorescence tracks from cosmic ray air showers. The Central Laser Facility provides a ''test beam'' to investigate properties of the atmosphere and the fluorescence detectors. The laser can send light via optical fiber simultaneously to the nearest surface detector tank for hybrid timing analyses. We describe the facility and show some examples of its many uses.
Date:
July 1, 2005
Creator:
Arqueros, F.; Bellido, J.; Covault, C.; D'Urso, D.; Di Giulio, C.; Facal, P. et al.
Object Type:
Article
System:
The UNT Digital Library
INL Capabilities For Nuclear Data Measurements Using The Argonne Intense Pulsed Neutron Source Facility
The relevant facts concerning the Argonne National Laboratory – Intense Pulsed Neutron Source (ANL/IPNS) and the Idaho National Laboratory (INL) apparatus for use at the ANL/IPNS facility to measure differential neutron interaction cross sections of interest for advanced reactor physics applications are presented. The INL apparatus, which consists of an array of multiple types of multiple detectors operated in coincidence, signal electronics, and a data acquisition system, is presented as an application of new means and methods to measure the relevant parameters described. The immediate measurement goals involve measurement of neutron induced interaction cross sections for 240Pu and 242Pu with 241Pu, 241Am, with measurements for other nuclides of interest for advanced reactor physics applications to follow later. Specific uncertainties and error limits are presented and methods for controlling these uncertainties are described. The post experiment analysis using data sorts and data selection from a large, self-consistent data set to produce spectra that will be analyzed for direct results and used to determine cross sections is also discussed.
Date:
July 1, 2005
Creator:
Aryaeinejad, R.; Nigg, D. W.; Janssens, R.V.F.; Micklich, B. J.; Ter-Akopian, G. & Cole, J. D.
Object Type:
Article
System:
The UNT Digital Library
SEARCH FOR THE LEPTON FLAVOR VIOLATING DECAY AO / HO YIELDS T+- M-+ AT HADRON COLLIDERS.
None
Date:
July 1, 2002
Creator:
Assamagan, Kétévi Adiklé; Deandrea, Aldo & Delsart, Pierre-Antoine
Object Type:
Report
System:
The UNT Digital Library
Diffractive J/Psi Production
This work presents measurements of two diffractive production ratio for heavy flavour physics with the use of a reconstructed J/{psi} {yields} {mu}{sup +}{mu}{sup -} sample in p{bar p} collisions at {radical}s = 1.96 TeV using the D0 detector at Fermilab Tevatron. These events were selected using the Luminosity Monitor detectors, the calorimeter system and the muon system in a pseudo-rapidity region with range 2.7 {le} |{eta}| {le} 4.4. The measured ratio were estimated to be N{sub diff}{sup J/{psi}}/N{sub total}{sup J/{psi}} = (1.74 {+-} 0.16(stat) {+-} 0.13(syst))% e N{sub diff}{sup b}/N{sub total}{sup b} = (0.79 {+-} 0.11(stat) {+-} 0.23(syst))%.
Date:
July 1, 2007
Creator:
Assis Jesus, Ana Carolina & U., /Rio de Janeiro Federal
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Low Cost Glass and Glass-Ceramic Substrates for Thin-Film Silicon Solar Cells: Final Subcontract Report, 25 January 2001
This report describes how Cornell University researchers developed several low-cost and simple barrier layers and tested their effectiveness both analytically (by SIMS) and by evaluating the electrical characteristics of devices fabricated on barrier-coated substrates. Devices fabricated included both majority-carrier devices (thin-film transistors) and minority-carrier devices (p-i-n junction diodes simulating solar cells) using various deposition techniques including the chemical vapor deposition of polysilicon from silane at low pressures (at Cornell University) and from dichlorosilane at atmospheric pressure (cooperation with Neudeck at Purdue University). The structure of the films deposited was investigated by using TEM and X-ray analysis. The performance of the minority- and majority-carrier devices fabricated on barrier-coated glass ceramic substrates was found to be identical to devices fabricated on control substrates of oxidized silicon and fused silica.
Date:
July 1, 2002
Creator:
Ast, D.; Nemchuk, N. & Krasula, S.
Object Type:
Report
System:
The UNT Digital Library