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537 Matching Results
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The Altus Times (Altus, Okla.), Vol. 109, No. 158, Ed. 1 Monday, December 3, 2007
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 3, 2007
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Automobile and Light Truck Fuel Economy: The CAFE Standards
This report is on the Automobile and Light Truck Fuel Economy: The CAFE Standards.
Date:
December 3, 2007
Creator:
Yacobucci, Brent D. & Bamberger, Robert
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 87, No. 2, Ed. 1 Monday, December 3, 2007
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 3, 2007
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
Charmless Hadronic B Decays at BaBar
We report recent measurements of branching fractions and charge asymmetries of charmless hadronic B decays using the data collected with the BABAR detector at the PEP-II asymmetric energy e{sup +}e{sup -} collider.
Date:
December 3, 2007
Creator:
Mohanty, Gagan B. & Collaboration, for the BABAR
Object Type:
Article
System:
The UNT Digital Library
Circulation Myth Busters!
This presentation discusses circulation in the libraries and what the policies, processes, services, and resources are for the UNT Libraries circulation department.
Date:
December 3, 2007
Creator:
Leuzinger, Julie
Object Type:
Presentation
System:
The UNT Digital Library
Cold Dark Matter Substructure and Galactic Disks I: Morphological Signatures of Hierarchical SatelliteAccretion
We conduct a series of high-resolution, fully self-consistent dissipation less N-body simulations to investigate the cumulative effect of substructure mergers onto thin disk galaxies in the context of the {Lambda}CDM paradigm of structure formation. Our simulation campaign is based on a hybrid approach combining cosmological simulations and controlled numerical experiments. Substructure mass functions, orbital distributions, internal structures, and accretion times are culled directly from cosmological simulations of galaxy-sized cold dark matter (CDM) halos. We demonstrate that accretions of massive subhalos onto the central regions of host halos, where the galactic disk resides, since z {approx} 1 should be common occurrences. In contrast, extremely few satellites in present-day CDM halos are likely to have a significant impact on the disk structure. This is due to the fact that massive subhalos with small orbital pericenters that are most capable of strongly perturbing the disk become either tidally disrupted or suffer substantial mass loss prior to z = 0. One host halo merger history is subsequently used to seed controlled N-body experiments of repeated satellite impacts on an initially-thin Milky Way-type disk galaxy. These simulations track the effects of six dark matter substructures, with initial masses in the range {approx} (0.7-2) x 10{sup …
Date:
December 3, 2007
Creator:
Kazantzidis, Stelios; Bullock, James S.; Zentner, Andrew R.; Kravtsov, Andrey V. & Moustakas, Leonidas A.
Object Type:
Article
System:
The UNT Digital Library
Control of Laser Plasma Based Accelerators up to 1 GeV
This dissertation documents the development of a broadband electron spectrometer (ESM) for GeV class Laser Wakefield Accelerators (LWFA), the production of high quality GeV electron beams (e-beams) for the first time in a LWFA by using a capillary discharge guide (CDG), and a statistical analysis of CDG-LWFAs. An ESM specialized for CDG-LWFAs with an unprecedented wide momentum acceptance, from 0.01 to 1.1 GeV in a single shot, has been developed. Simultaneous measurement of e-beam spectra and output laser properties as well as a large angular acceptance (> {+-} 10 mrad) were realized by employing a slitless scheme. A scintillating screen (LANEX Fast back, LANEX-FB)--camera system allowed faster than 1 Hz operation and evaluation of the spatial properties of e-beams. The design provided sufficient resolution for the whole range of the ESM (below 5% for beams with 2 mrad divergence). The calibration between light yield from LANEX-FB and total charge, and a study on the electron energy dependence (0.071 to 1.23 GeV) of LANEX-FB were performed at the Advanced light source (ALS), Lawrence Berkeley National Laboratory (LBNL). Using this calibration data, the developed ESM provided a charge measurement as well. The production of high quality electron beams up to 1 GeV …
Date:
December 3, 2007
Creator:
Nakamura, Kei
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Damage threshold of inorganic solids under free-electron-laser irradiation at 32.5 nm wavelength
We exposed samples of B4C, amorphous C, chemical-vapor-deposition (CVD)-diamond C, Si, and SiC to single 25 fs-long pulses of 32.5 nm free-electron-laser radiation at fluences of up to 2.2 J/cm{sup 2}. The samples were chosen as candidate materials for x-ray free electron laser (XFEL) optics. We found that the threshold for surface-damage is on the order of the fluence required for thermal melting. For larger fluences, the crater depths correspond to temperatures on the order of the critical temperature, suggesting that the craters are formed by two-phase vaporization [1]. XFELs have the promise of producing extremely high-intensity ultrashort pulses of coherent, monochromatic radiation in the 1 to 10 keV regime. The expected high output fluence and short pulse duration pose significant challenges to the optical components, including radiation damage. It has not been possible to obtain direct experimental verification of the expected damage thresholds since appropriate x-ray sources are not yet available. FLASH has allowed us to study the interaction of high-fluence short-duration photon pulses with materials at the shortest wavelength possible to date. With these experiments, we have come closer to the extreme conditions expected in XFEL-matter interaction scenarios than previously possible.
Date:
December 3, 2007
Creator:
Hau-Riege, S.; London, R. A.; Bionta, R. M.; McKernan, M. A.; Baker, S. L.; Krzywinski, J. et al.
Object Type:
Report
System:
The UNT Digital Library
Defining and testing a granular continuum element
Continuum mechanics relies on the fundamental notion of amesoscopic volume "element" in which properties averaged over discreteparticles obey deterministic relationships. Recent work on granularmaterials suggests a continuum law may be inapplicable, revealinginhomogeneities at the particle level, such as force chains and slow cagebreaking. Here, we analyze large-scale Discrete-Element Method (DEM)simulations of different granular flows and show that a "granularelement" can indeed be defined at the scale of dynamical correlations,roughly three to five particle diameters. Its rheology is rather subtle,combining liquid-like dependence on deformation rate and solid-likedependence on strain. Our results confirm some aspects of classicalplasticity theory (e.g., coaxiality of stress and deformation rate),while contradicting others (i.e., incipient yield), and can guide thedevelopment of more realistic continuum models.
Date:
December 3, 2007
Creator:
Rycroft, Chris H.; Kamrin, Ken & Bazant, Martin Z.
Object Type:
Article
System:
The UNT Digital Library
Effects of Protective Plates and Stoplogs on Water Flow Through the Gleed Fish Screen Facility, April 2007 - September 2007.
In 2007, Pacific Northwest National Laboratory was asked by the U.S. Bureau of Reclamation to provide additional velocity measurements at Gleed fish screens site to support decisions on mitigating extreme flow fluctuations near the screens. The site consistently has had extreme water velocities in places and a strong back eddy at the downstream end in spring and summer. With the help of Washington Department of Fish and Wildlife staff, we measured the effects of different stoplog configurations behind the screens in May and July 2007. Protective metal plates in front of the trash racks were confirmed to be the cause of uneven and extreme water flow past the vertical traveling screens. Stoplogs were not sufficient to significantly reduce the effect of those metal plates on water velocities past and through the site. We provide a few suggestions including making it easier to raise and lower the metal plates and then adjusting them more often, constructing a new trash rack across the diversion entrance, and raising the control gate at the end of the site as long as possible in spring and during flood events.
Date:
December 3, 2007
Creator:
Chamness, Mickie
Object Type:
Report
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Monday, December 3, 2007
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 3, 2007
Creator:
Wilson, Chris
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Federal Land Ownership: Constitutional Authority and the History of Acquisition, Disposal, and Retention
None
Date:
December 3, 2007
Creator:
Alexander, Kristina & Gorte, Ross W.
Object Type:
Report
System:
The UNT Digital Library
Fuel Effects on a Low-Swirl Injector for Lean Premixed Gas Turbines
Laboratory experiments have been conducted to investigate the fuel effects on the turbulent premixed flames produced by a gas turbine low-swirl injector (LSI). The lean-blow off limits and flame emissions for seven diluted and undiluted hydrocarbon and hydrogen fuels show that the LSI is capable of supporting stable flames that emit < 5 ppm NO{sub x} ({at} 15% O{sub 2}). Analysis of the velocity statistics shows that the non-reacting and reacting flowfields of the LSI exhibit similarity features. The turbulent flame speeds, S{sub T}, for the hydrocarbon fuels are consistent with those of methane/air flames and correlate linearly with turbulence intensity. The similarity feature and linear S{sub T} correlation provide further support of an analytical model that explains why the LSI flame position does not change with flow velocity. The results also show that the LSI does not need to undergo significant alteration to operate with the hydrocarbon fuels but needs further studies for adaptation to burn diluted H{sub 2} fuels.
Date:
December 3, 2007
Creator:
Littlejohn, David; Littlejohn, David & Cheng, R.K.
Object Type:
Article
System:
The UNT Digital Library
Hearings in the U.S. Senate: A Guide for Preparation and Procedure
This report discusses hearings in the U.S. Senate and is divided into four main sections. This introduction addresses the role of hearings in the committee process, types of hearings, and broad organizational issues.
Date:
December 3, 2007
Creator:
Palmer, Betsy
Object Type:
Report
System:
The UNT Digital Library
In situ x-ray photoelectron spectroscopy studies of gas/solidinterfaces at near-ambient conditions
X-ray photoelectron spectroscopy (XPS) is a quantitative, chemically specific technique with a probing depth of a few angstroms to a few nanometers. It is therefore ideally suited to investigate the chemical nature of the surfaces of catalysts. Because of the scattering of electrons by gas molecules, XPS is generally performed under vacuum conditions. However, for thermodynamic and/or kinetic reasons, the catalyst's chemical state observed under vacuum reaction conditions is not necessarily the same as that of a catalyst under realistic operating pressures. Therefore, investigations of catalysts should ideally be performed under reaction conditions, i.e., in the presence of a gas or gas mixtures. Using differentially pumped chambers separated by small apertures, XPS can operate at pressures of up to 1 Torr, and with a recently developed differentially pumped lens system, the pressure limit has been raised to about 10 Torr. Here, we describe the technical aspects of high-pressure XPS and discuss recent applications of this technique to oxidation and heterogeneous catalytic reactions on metal surfaces.
Date:
December 3, 2007
Creator:
Bluhm, Hendrik; Havecker, Michael; Knop-Gericke, Axel; Kiskinova,Maya; Schlogl, Robert & Salmeron, Miquel
Object Type:
Article
System:
The UNT Digital Library
Internal Alignment of the SLD Vertex Detector
The tracking resolution and vertex finding capabilities of the SLD experiment depended upon a precise knowledge of the location and orientation of the elements of the SLD pixel vertex detector (VXD3) in 3D space. At the heart of the procedure described here to align the 96 CCDs is the matrix inversion technique of singular value decomposition (SVD). This tool was employed to unfold the detector geometry corrections from the track data in the VXD3. The algorithm was adapted to perform an optimal {chi}{sup 2} minimization by careful treatment of the track hit residual measurement errors. The tracking resolution obtained with the aligned geometry achieved the design performance. Comments are given on how this method could be used for other trackers.
Date:
December 3, 2007
Creator:
Jackson, D. J.; Wickens, F. J. & Su, D.
Object Type:
Article
System:
The UNT Digital Library
Is the U.S. Current Account Deficit Sustainable?
None
Date:
December 3, 2007
Creator:
Labonte, Marc
Object Type:
Report
System:
The UNT Digital Library
Long-Term US Industrial Energy Use and CO2 Emissions
We present a description and scenario results from our recently-developed long-term model of United States industrial sector energy consumption, which we have incorporated as a module within the ObjECTS-MiniCAM integrated assessment model. This new industrial model focuses on energy technology and fuel choices over a 100 year period and allows examination of the industrial sector response to climate policies within a global modeling framework. A key challenge was to define a level of aggregation that would be able to represent the dynamics of industrial energy demand responses to prices and policies, but at a level that remains tractable over a long time frame. In our initial results, we find that electrification is an important response to a climate policy, although there are services where there are practical and economic limits to electrification, and the ability to switch to a low-carbon fuel becomes key. Cogeneration of heat and power using biomass may also play a role in reducing carbon emissions under a policy constraint.
Date:
December 3, 2007
Creator:
Wise, Marshall A.; Sinha, Paramita; Smith, Steven J. & Lurz, Joshua P.
Object Type:
Report
System:
The UNT Digital Library
Lump-Sum Distributions Under the Pension Protection Act
None
Date:
December 3, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Nuclear Warheads: The Reliable Replacement Warhead Program and the Life Extension Program
None
Date:
December 3, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 92, No. 74, Ed. 1 Monday, December 3, 2007
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
December 3, 2007
Creator:
Zaman, Ashiq
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Quarantine and Isolation: Selected Legal Issues Relating to Employment
None
Date:
December 3, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Remaining Sites Verification Package for the 100-F-26:10, 1607-F3 Sanitary Sewer Pipelines (182-F, 183-F, and 151-F Sanitary Sewer Lines), Waste Site Reclassification Form 2007-028
The 100-F-26:10 waste site includes sanitary sewer lines that serviced the former 182-F, 183-F, and 151-F Buildings. In accordance with this evaluation, the verification sampling results support a reclassification of this site to Interim Closed Out. The results of verification sampling show that residual contaminant concentrations do not preclude any future uses and allow for unrestricted use of shallow zone soils. The results also demonstrate that residual contaminant concentrations are protective of groundwater and the Columbia River.
Date:
December 3, 2007
Creator:
Dittmer, L. M.
Object Type:
Report
System:
The UNT Digital Library
Remaining Sites Verification Package for the 1607-F4 Sanitary Sewer System, Waste Site Reclassification Form 2004-131
The 1607-F4 waste site is the former location of the sanitary sewer system that serviced the former 115-F Gas Recirculation Building. The system included a septic tank, drain field, and associated pipeline that were in use from 1944 to 1965. The 1607-F4 waste site received unknown amounts of sanitary sewage from the 115-F Gas Recirculation Building and may have potentially contained hazardous and radioactive contamination. In accordance with this evaluation, the verification sampling results support a reclassification of this site to Interim Closed Out. The results of verification sampling demonstrated that residual contaminant concentrations do not preclude any future uses and allow for unrestricted use of shallow zone soils. The results also showed that residual contaminant concentrations are protective of groundwater and the Columbia River.
Date:
December 3, 2007
Creator:
Dittmer, L. M.
Object Type:
Report
System:
The UNT Digital Library