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K2CsSb Cathode Development
K{sub 2}CsSb is an attractive photocathode for high current applications. With a quantum efficiency of >4% at 532nm and >10% at 355nm, it is the only cathode to have demonstrated an average current of 35mA in an accelerator environment We describe ongoing cathode development work. for the energy recovery linac being constructed at BNL Several cathodes have been created on both copper and stainless steel substrates, and their spatial uniformity and spectral response have been characterized. Preliminary lifetime measurements have been performed at high average current densities (>1 mA/mm{sup 2}).
Date:
October 1, 2008
Creator:
Smedley, J.; Rao, T. & Wang, E.
Object Type:
Article
System:
The UNT Digital Library
Land Use Classification
This document is intended to describe and depict how land use classifications are made under the Texas Risk Reduction Plan (TRRP) rule.
Date:
October 2008
Creator:
Texas Commission on Environmental Quality
Object Type:
Text
System:
The Portal to Texas History
LDRD final report on synthesis of shape-and size-controlled platinum and platinum alloy nanostructures on carbon with improved durability.
This project is aimed to gain added durability by supporting ripening-resistant dendritic platinum and/or platinum-based alloy nanostructures on carbon. We have developed a new synthetic approach suitable for directly supporting dendritic nanostructures on VXC-72 carbon black (CB), single-walled carbon nanotubes (SWCNTs), and multi-walled carbon nanotubes (MWCNTs). The key of the synthesis is to creating a unique supporting/confining reaction environment by incorporating carbon within lipid bilayer relying on a hydrophobic-hydrophobic interaction. In order to realize size uniformity control over the supported dendritic nanostructures, a fast photocatalytic seeding method based on tin(IV) porphyrins (SnP) developed at Sandia was applied to the synthesis by using SnP-containing liposomes under tungsten light irradiation. For concept approval, one created dendritic platinum nanostructure supported on CB was fabricated into membrane electrode assemblies (MEAs) for durability examination via potential cycling. It appears that carbon supporting is essentially beneficial to an enhanced durability according to our preliminary results.
Date:
October 1, 2008
Creator:
Shelnutt, John Allen; Garcia, Robert M.; Song, Yujiang; Moreno, Andres M. & Stanis, Ronald J.
Object Type:
Report
System:
The UNT Digital Library
LINACS FOR FUTURE MUON FACILITIES
Future Muon Colliders (MC) and Neutrino Factories (NF) based on muon storage rings will require innovative linacs to: produce the muons, cool them, compress longi-tudinally and ‘shape’ them into a beam and finally to rap-idly accelerate them to multi-GeV (NF) and TeV (MC) energies. Each of these four linac applications has new requirements and opportunities that follow from the na-ture of the muon in that it has a short lifetime (τ = 2.2 μsec) in its own rest frame, it is produced in a tertiary process into a large emittance, and its electron, photon, and neutrino decay products can be more than an annoy-ance. As an example, for optimum performance, the linac repetition rates should scale inversely with the laboratory lifetime of the muon in its storage ring, something as high as 1 kHz for a 40 GeV Neutrino Factory or as low as 20 Hz for a 5 TeV Muon Collider. A superconducting 8 GeV Linac capable of CW operation is being studied as a ver-satile option for muon production [1] for colliders, facto-ries, and muon beams for diverse purposes. A linac filled with high pressure hydrogen gas and imbedded in strong magnetic fields has been proposed to rapidly …
Date:
October 1, 2008
Creator:
Slawomir Bogacz, Rolland Johnson
Object Type:
Article
System:
The UNT Digital Library
The Llano News (Llano, Tex.), Vol. 122, No. 1, Ed. 1 Wednesday, October 1, 2008
Weekly newspaper from Llano, Texas that includes local, state, and national news along with advertising.
Date:
October 1, 2008
Creator:
Stephenson, Jimmy
Object Type:
Newspaper
System:
The Portal to Texas History
Lone Star Ink: Exploring Texas through Historic Newspapers, 1860-1922: Grant Materials
These grant materials were prepared for the National Digital Newspaper Program, a project funded by the National Endowment for the Humanities (NEH) to provide access to historic American Newspapers. The Library of Congress serves as the technical adviser for the NDNP. The Award funded digitization of Texas historical newspapers. For the grant, UNT served as the lead institution and partnered with the Center for American History at the University of Texas. This proposal was funded for $399,790.
Date:
October 2008
Creator:
Belden, Dreanna & Hartman, Cathy Nelson
Object Type:
Text
System:
The UNT Digital Library
Lucasfilm, Save Energy Now (SEN) Data Center Assessment Summary
This assessment summary describes how the industrial Technologies Program helped Lucasfilm to find ways to improve the efficiency of its data center by performing a Save Energy Now energy assessment.
Date:
October 1, 2008
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Mannford Eagle (Mannford, Okla.), Vol. 25, No. 127, Ed. 1 Wednesday, October 1, 2008
Weekly newspaper from Mannford, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 1, 2008
Creator:
Hughes, Dustin
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Mapping mesoscale heterogeneity in the plastic deformation of a copper single crystal
The work reported here is part of a 'multiscale characterization' study of heterogeneous deformation patterns in metals. A copper single crystal was oriented for single slip in the (111)[{bar 1}01] slip system and tested to {approx}10% strain in roughly uniaxial compression. The macroscopic strain field was monitored during the test by optical 'image correlation'. The strain field was measured on orthogonal surfaces, one of which (the x-face) was oriented perpendicular to [1{bar 2}1] and contained the [{bar 1}01] direction of the preferred slip system. The macroscopic strain developed in an inhomogeneous pattern of broad, crossed shear bands in the x-face. One, the primary band, lay parallel to (111). The second, the 'conjugate' band, was oriented perpendicular to (111) with an overall ({bar 1}01) habit that contains no common slip plane of the fcc crystal. The mesoscopic deformation pattern was explored with selected area diffraction, using a focused synchrotron radiation polychromatic beam with a resolution of 1-3 {micro}m. Areas within the primary, conjugate and mixed (primary + conjugate) strain regions of the x-face were identified and mapped for their orientation, excess defect density and shear stress. The mesoscopic defect structure was concentrated in broad, somewhat irregular primary bands that lay nominally …
Date:
October 1, 2008
Creator:
Magid, K. R.; Florando, J.N.; Lassila, D.H.; Leblanc, M. M.; Tamura, N. & Morris, J. W., Jr.
Object Type:
Article
System:
The UNT Digital Library
Materials and Component Development for Advanced Turbine Systems
In order to meet the 2010-2020 DOE Fossil Energy goals for Advanced Power Systems, future oxy-fuel and hydrogen-fired turbines will need to be operated at higher temperatures for extended periods of time, in environments that contain substantially higher moisture concentrations in comparison to current commercial natural gas-fired turbines. Development of modified or advanced material systems, combined with aerothermal concepts are currently being addressed in order to achieve successful operation of these land-based engines. To support the advanced turbine technology development, the National Energy Technology Laboratory (NETL) has initiated a research program effort in collaboration with the University of Pittsburgh (UPitt), and West Virginia University (WVU), working in conjunction with commercial material and coating suppliers as Howmet International and Coatings for Industry (CFI), and test facilities as Westinghouse Plasma Corporation (WPC) and Praxair, to develop advanced material and aerothermal technologies for use in future oxy-fuel and hydrogen-fired turbine applications. Our program efforts and recent results are presented.
Date:
October 1, 2008
Creator:
Alvin, M. A.; Pettit, F.; Meier, G.; Yanar, N.; Chyu, M.; Mazzotta, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Matrix solution to longitudinal impedance of multi-layer circular structures
A matrix method in which radial wave propagation is treated in analogy to longitudinal transmission lines is presented and applied to finding the longitudinal coupling impedance of axially symmetric multi-layer beam tubes. The method is demonstrated in the case of a Higher Order Mode ferrite absorber with an inserted coated ceramic beam tube. The screening of the ferrite damping properties by the dielectric beam tube is discussed.
Date:
October 1, 2008
Creator:
Hahn,H.
Object Type:
Report
System:
The UNT Digital Library
Measurement of the top-antitop quark pair differential cross section with respect to the invariant mass of the pair in proton-antiproton collisions at a center of mass energy of 1.96 TeV
I present a measurement of the t{bar t} differential cross section, d{sigma}/dM{sub t{bar t}}, in p{bar p} collisions at {radical}s = 1.96 TeV using 2.7 fb{sup -1} of CDF II data. I find that d{sigma}/dM{sub t{bar t}} is consistent with the Standard Model expectation, as modeled by PYTHIA with CTEQ5L parton distribution functions. I set limits on the ratio {kappa}/M{sub Pl} in the Randall-Sundrum model by looking for Kaluza Klein gravitons which decay to top quarks. I find {kappa}/M{sub Pl} > 0.16 at the 95% confidence level.
Date:
October 1, 2008
Creator:
Bridgeman, Alice
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Measurements and searches with top quarks
In 1995 the last missing member of the known families of quarks, the top quark, was discovered by the CDF and D0 experiments at the Tevatron, a proton-antiproton collider at Fermilab near Chicago. Until today, the Tevatron is the only place where top quarks can be produced. The determination of top quark production and properties is crucial to understand the Standard Model of particle physics and beyond. The most striking property of the top quark is its mass--of the order of the mass of a gold atom and close to the electroweak scale--making the top quark not only interesting in itself but also as a window to new physics. Due to the high mass, much higher than of any other known fermion, it is expected that the top quark plays an important role in electroweak symmetry breaking, which is the most prominent candidate to explain the mass of particles. In the Standard Model, electroweak symmetry breaking is induced by one Higgs field, producing one additional physical particle, the Higgs boson. Although various searches have been performed, for example at the Large Electron Positron Collider (LEP), no evidence for the Higgs boson could yet be found in any experiment. At the …
Date:
October 1, 2008
Creator:
Peters, Reinhild Yvonne & U., /Wuppertal
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Measurements and Studies of Secondary Electron Emission of Diamond Amplified Photocathode
The Diamond Amplified Photocathode (DAP) is a novel approach to generating electrons. By following the primary electron beam, which is generated by traditional electron sources, with an amplifier, the electron beam available to the eventual application is increased by 1 to 2 orders of magnitude in current. Diamond has a very wide band gap of 5.47eV which allows for a good negative electron affinity with simple hydrogenation, diamond can hold more than 2000MV/m field before breakdown. Diamond also provides the best rigidity among all materials. These two characters offer the capability of applying high voltage across very thin diamond film to achieve high SEY and desired emission phase. The diamond amplifier also is capable of handling a large heat load by conduction and sub-nanosecond pulse input. The preparation of the diamond amplifier includes thinning and polishing, cleaning with acid etching, metallization, and hydrogenation. The best mechanical polishing available can provide high purity single crystal diamond films with no less than 100 {micro}m thickness and <15 nm Ra surface roughness. The ideal thickness for 700MHz beam is {approx}30 {micro}m, which requires further thinning with RIE or laser ablation. RIE can achieve atomic layer removal precision and roughness eventually, but the time …
Date:
October 1, 2008
Creator:
Wu, Q.
Object Type:
Report
System:
The UNT Digital Library
Measurements and Studies of Secondary Electron Emission of Diamond Amplified Photocathode
N/A
Date:
October 1, 2008
Creator:
Q., Wu
Object Type:
Report
System:
The UNT Digital Library
Measuring OutdoorAir Intake Rates Using Electronic Velocity Sensors at Louvers and Downstream of Airflow Straighteners
Practical and accurate technologies are needed for continuously measuring and controlling outdoor air (OA) intake rates in commercial building heating, ventilating, and air conditioning (HVAC) systems. This project evaluated two new measurement approaches. Laboratory experiments determined that OA flow rates were measurable with errors generally less than 10percent using electronic air velocity probes installed between OA intake louver blades or at the outlet face of louvers. High accuracy was maintained with OA flow rates as low as 15percent of the maximum for the louvers. Thus, with this measurement approach HVAC systems do not need separate OA intakes for minimum OA supply. System calibration parameters are required for each unique combination of louver type and velocity sensor location but calibrations are not necessary for each system installation. The research also determined that the accuracy of measuring OA flow rates with velocity probes located in the duct downstream of the intake louver was not improved by installing honeycomb airflow straighteners upstream of the probes. Errors varied with type of upstream louver, were as high as 100percent, and were often greater than 25percent. In conclusion, use of electronic air velocity probes between the blades of OA intake louvers or at the outlet face …
Date:
October 1, 2008
Creator:
Fisk, William; Sullivan, Douglas; Cohen, Sebastian & Han, Hwataik
Object Type:
Report
System:
The UNT Digital Library
Megagauss field generation for high-energy-density plasma science experiments.
There is a need to generate magnetic fields both above and below 1 megagauss (100 T) with compact generators for laser-plasma experiments in the Beamlet and Petawatt test chambers for focused research on fundamental properties of high energy density magnetic plasmas. Some of the important topics that could be addressed with such a capability are magnetic field diffusion, particle confinement, plasma instabilities, spectroscopic diagnostic development, material properties, flux compression, and alternate confinement schemes, all of which could directly support experiments on Z. This report summarizes a two-month study to develop preliminary designs of magnetic field generators for three design regimes. These are, (1) a design for a relatively low-field (10 to 50 T), compact generator for modest volumes (1 to 10 cm3), (2) a high-field (50 to 200 T) design for smaller volumes (10 to 100 mm3), and (3) an extreme field (greater than 600 T) design that uses flux compression. These designs rely on existing Sandia pulsed-power expertise and equipment, and address issues of magnetic field scaling with capacitor bank design and field inductance, vacuum interface, and trade-offs between inductance and coil designs.
Date:
October 1, 2008
Creator:
Rovang, Dean Curtis; Struve, Kenneth William & Porter, John Larry Jr.
Object Type:
Report
System:
The UNT Digital Library
The Mercedes Enterprise (Mercedes, Tex.), Vol. 100, No. 40, Ed. 1 Wednesday, October 1, 2008
Weekly newspaper from Mercedes, Texas that includes local, state, and national news along with advertising.
Date:
October 1, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
MI Gap Clearing Kicker Magnet Design Review
The kicker system requirements were originally conceived for the NOvA project. NOvA is a neutrino experiment located in Minnesota. To achieve the desired neutrino flux several upgrades are required to the accelerator complex. The Recycler will be used as a proton pre-injector for the Main Injector (MI). As the Recycler is the same size as the MI, it is possible to do a single turn fill ({approx}11 {micro}sec), minimizing the proton injection time in the MI cycle and maximizing the protons on target. The Recycler can then be filled with beam while the MI is ramping to extract beam to the target. To do this requires two new transfer lines. The existing Recycler injection line was designed for 10{pi} pbar beams, not the 20{pi} proton beams we anticipate from the Booster. The existing Recycler extraction line allows for proton injection through the MI, while we want direct injection from the Booster. These two lines will be decommissioned. The new injection line from the MI8 line into the Recycler will start at 848 and end with injection kickers at RR104. The new extraction line in the RR30 straight section will start with a new extraction kicker at RR232 and end with …
Date:
October 1, 2008
Creator:
Jensen, Chris
Object Type:
Report
System:
The UNT Digital Library
Microfabricated wire arrays for Z-pinch.
Microfabrication methods have been applied to the fabrication of wire arrays suitable for use in Z. Self-curling GaAs/AlGaAs supports were fabricated as an initial route to make small wire arrays (4mm diameter). A strain relief structure that could be integrated with the wire was designed to allow displacements of the anode/cathode connections in Z. Electroplated gold wire arrays with integrated anode/cathode bus connections were found to be sufficiently robust to allow direct handling. Platinum and copper plating processes were also investigated. A process to fabricate wire arrays on any substrate with wire thickness up to 35 microns was developed. Methods to handle and mount these arrays were developed. Fabrication of wire arrays of 20mm diameter was demonstrated, and the path to 40mm array fabrication is clear. With some final investment to show array mounting into Z hardware, the entire process to produce a microfabricated wire array will have been demonstrated.
Date:
October 1, 2008
Creator:
Spahn, Olga Blum; Rowen, Adam M.; Cich, Michael Joseph; Peake, Gregory Merwin; Arrington, Christian L.; Nash, Thomas J. et al.
Object Type:
Report
System:
The UNT Digital Library
[Minutes for the TXSSAR Board of Managers Meeting: October 25, 2008]
Minutes from a meeting of the TXSSAR Board of Managers, held from October 25, 2008, at the Hilton Garden Inn, Temple, Texas, including a summary of activities and business discussed. The meeting was called to order by President Harry Fife in the Salon C & D in the Hilton Garden Inn.
Date:
October 2008
Creator:
Sons of the American Revolution. Texas Society.
Object Type:
Text
System:
The UNT Digital Library
Modified MTS MRB500 Catalyst Performance Test
An experiment was conducted to determine if the oxygen supply in a CuO catalyst considered for use in the TMIST-2 irradiation test would be sufficient to convert all the hydrogen isotopes coming from the irradiation test to water. A mixture of 2% H2 in Ar was supplied to a modified MRB 500 stack m onitor from Mound Techology Solutions, Miamisburg, OH. It was found that the catalyst could convert 3.75E-03 moles of H2 before losing its effectiveness. Conversion was found to begin at a catalyst temperature of about 220 deg C and to be fully effective at about 300 deg C.
Date:
October 1, 2008
Creator:
Longhurst, Glen R. & Pawelko, Robert J.
Object Type:
Report
System:
The UNT Digital Library
Monolithic Fuel Fabrication Process Development at the Idaho National Laboratory
Within the Reduced Enrichment for Research and Test Reactors (RERTR) program directed by the US Department of Energy (DOE), UMo fuel-foils are being developed in an effort to realize high density monolithic fuel plates for use in high-flux research and test reactors. Namely, targeted are reactors that are not amenable to Low Enriched Uranium (LEU) fuel conversion via utilization of high density dispersion-based fuels, i.e. 8-9 gU/cc. LEU conversion of reactors having a need for >8-9 gU/cc fuel density will only be possible by way of monolithic fuel forms. The UMo fuel foils under development afford fuel meat density of ~16 gU/cc and thus have the potential to facilitate LEU conversions without any significant reactor-performance penalty. Two primary challenges have been established with respect to UMo monolithic fuel development; namely, fuel element fabrication and in-reactor fuel element performance. Both issues are being addressed concurrently at the Idaho National Laboratory. An overview is provided of the ongoing monolithic UMo fuel development effort at the Idaho National Laboratory (INL); including development of complex/graded fuel foils. Fabrication processes to be discussed include: UMo alloying and casting, foil fabrication via hot rolling, fuel-clad interlayer application via co-rolling and thermal spray processes, clad bonding via …
Date:
October 1, 2008
Creator:
Moore, Glenn A.; Rice, Francine J.; Woolstenhulme, Nicolas E.; SwanK, W. David; Haggard, DeLon C.; Jue, Jan-Fong et al.
Object Type:
Article
System:
The UNT Digital Library
Multi-Scale Multi-Dimensional Li-Ion Battery Model for Better Design and Management
The developed model used is to provide a better understanding and help answer engineering questions about improving the design, operational strategy, management, and safety of cells.
Date:
October 1, 2008
Creator:
Kim, G.-H. & Smith, K.
Object Type:
Presentation
System:
The UNT Digital Library