Latest content added for UNT Digital Library Searchhttps://digital2.library.unt.edu/search/?t=fulltext&fq=untl_decade%3A2000-2009&sort=creator2019-01-23T12:54:46-06:00UNT LibrariesThis is a custom feed for searching UNT Digital Library SearchPerformance Demonstration Program Plan for Nondestructive Assay of Drummed Wastes for the TRU Waste Characterization Program2017-10-14T08:36:47-05:00https://digital.library.unt.edu/ark:/67531/metadc1013654/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1013654/"><img alt="Performance Demonstration Program Plan for Nondestructive Assay of Drummed Wastes for the TRU Waste Characterization Program" title="Performance Demonstration Program Plan for Nondestructive Assay of Drummed Wastes for the TRU Waste Characterization Program" src="https://digital.library.unt.edu/ark:/67531/metadc1013654/thumbnail/"/></a></p><p>Each testing and analytical facility performing waste characterization activities for the Waste Isolation Pilot Plant (WIPP) participates in the Performance Demonstration Program (PDP) to comply with the Transuranic Waste Acceptance Criteria for the Waste Isolation Pilot Plant (WAC) (DOE/WIPP-02-3122) and the Quality Assurance Program Document (QAPD) (CBFO-94-1012). The PDP serves as a quality control check for data generated in the characterization of waste destined for WIPP. Single blind audit samples are prepared and distributed to each of the facilities participating in the PDP. The PDP evaluates analyses of simulated headspace gases, constituents of the Resource Conservation and Recovery Act (RCRA), and transuranic (TRU) radionuclides using nondestructive assay (NDA) techniques.</p>Scaled Experimental Modeling of VHTR Plenum Flows2016-09-22T02:13:12-05:00https://digital.library.unt.edu/ark:/67531/metadc888727/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc888727/"><img alt="Scaled Experimental Modeling of VHTR Plenum Flows" title="Scaled Experimental Modeling of VHTR Plenum Flows" src="https://digital.library.unt.edu/ark:/67531/metadc888727/thumbnail/"/></a></p><p>Abstract The Very High Temperature Reactor (VHTR) is the leading candidate for the Next Generation Nuclear Power (NGNP) Project in the U.S. which has the goal of demonstrating the production of emissions free electricity and hydrogen by 2015. Various scaled heated gas and water flow facilities were investigated for modeling VHTR upper and lower plenum flows during the decay heat portion of a pressurized conduction-cooldown scenario and for modeling thermal mixing and stratification (“thermal striping”) in the lower plenum during normal operation. It was concluded, based on phenomena scaling and instrumentation and other practical considerations, that a heated water flow scale model facility is preferable to a heated gas flow facility and to unheated facilities which use fluids with ranges of density to simulate the density effect of heating. For a heated water flow lower plenum model, both the Richardson numbers and Reynolds numbers may be approximately matched for conduction-cooldown natural circulation conditions. Thermal mixing during normal operation may be simulated but at lower, but still fully turbulent, Reynolds numbers than in the prototype. Natural circulation flows in the upper plenum may also be simulated in a separate heated water flow facility that uses the same plumbing as the lower plenum model. However, Reynolds number scaling distortions will occur at matching Richardson numbers due primarily to the necessity of using a reduced number of channels connected to the plenum than in the prototype (which has approximately 11,000 core channels connected to the upper plenum) in an otherwise geometrically scaled model. Experiments conducted in either or both facilities will meet the objectives of providing benchmark data for the validation of codes proposed for NGNP designs and safety studies, as well as providing a better understanding of the complex flow phenomena in the plenums.</p>Development of Advanced Wear and Corrosion Resistant Systems Through Laser Surface Alloying and Materials Processing2015-10-18T18:40:23-05:00https://digital.library.unt.edu/ark:/67531/metadc740783/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc740783/"><img alt="Development of Advanced Wear and Corrosion Resistant Systems Through Laser Surface Alloying and Materials Processing" title="Development of Advanced Wear and Corrosion Resistant Systems Through Laser Surface Alloying and Materials Processing" src="https://digital.library.unt.edu/ark:/67531/metadc740783/thumbnail/"/></a></p><p>The stability of tungsten carbide particles in iron-rich and nickel-rich liquid during the laser surface alloying (LSA) process was investigated. Kinetic calculations indicate a rapid dissolution of tungsten carbide particles in iron-rich liquid, as compared with the dissolution rate in nickel-rich liquid. Optical microscopy indicated a heterogeneous microstructure around the tungsten particles that is in agreement with concentration gradients predicted by kinetic calculation. The work demonstrates the applicability of computational thermodynamics and kinetic models for the LSA process.</p>Pressure-induced Breaking of Equilibrium Flux Surfaces in the W7AS Stellarator2016-11-13T19:26:23-06:00https://digital.library.unt.edu/ark:/67531/metadc929772/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc929772/"><img alt="Pressure-induced Breaking of Equilibrium Flux Surfaces in the W7AS Stellarator" title="Pressure-induced Breaking of Equilibrium Flux Surfaces in the W7AS Stellarator" src="https://digital.library.unt.edu/ark:/67531/metadc929772/thumbnail/"/></a></p><p>Calculations are presented for two shots in the W7AS stellarator which differ only in the magnitude of the current in the divertor control coil, but have very different values of experimentally attainable β (<β> ≈ 2.7% versus <β> ≈ 1.8%). Equilibrium calculations find that a region of chaotic magnetic field line trajectories fills approximately the outer 1/3 of the cross-section in each of these configurations. The field lines in the stochastic region are calculated to behave as if the flux surfaces are broken only locally near the outer midplane and are preserved elsewhere. The calculated magnetic field line diffusion coefficients in the stochastic regions for the two shots are consistent with the observed differences in the attainable β, and are also consistent with the differences in the reconstructed pressure profiles.</p>Emittance Reduction between EBIS LINAC and Booster by Electron Beam Cooling - Is Single Pass Cooling Possible?2016-05-19T09:45:19-05:00https://digital.library.unt.edu/ark:/67531/metadc832632/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc832632/"><img alt="Emittance Reduction between EBIS LINAC and Booster by Electron Beam Cooling - Is Single Pass Cooling Possible?" title="Emittance Reduction between EBIS LINAC and Booster by Electron Beam Cooling - Is Single Pass Cooling Possible?" src="https://digital.library.unt.edu/ark:/67531/metadc832632/thumbnail/"/></a></p><p>N/A</p>Optical simulations of the ion beam emittance growth in different types of a gridded lens2016-05-19T09:45:19-05:00https://digital.library.unt.edu/ark:/67531/metadc846762/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc846762/"><img alt="Optical simulations of the ion beam emittance growth in different types of a gridded lens" title="Optical simulations of the ion beam emittance growth in different types of a gridded lens" src="https://digital.library.unt.edu/ark:/67531/metadc846762/thumbnail/"/></a></p><p>N/A</p>Cancellation of the Chromatic Effects with proper Field Profile2016-05-19T09:45:19-05:00https://digital.library.unt.edu/ark:/67531/metadc827387/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc827387/"><img alt="Cancellation of the Chromatic Effects with proper Field Profile" title="Cancellation of the Chromatic Effects with proper Field Profile" src="https://digital.library.unt.edu/ark:/67531/metadc827387/thumbnail/"/></a></p><p>N/A</p>Astrophysical Gyrokinetics: Kinetic and Fluid Turbulent Cascades In Magentized Weakly Collisional Plasmas2016-11-13T19:26:23-06:00https://digital.library.unt.edu/ark:/67531/metadc925684/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc925684/"><img alt="Astrophysical Gyrokinetics: Kinetic and Fluid Turbulent Cascades In Magentized Weakly Collisional Plasmas" title="Astrophysical Gyrokinetics: Kinetic and Fluid Turbulent Cascades In Magentized Weakly Collisional Plasmas" src="https://digital.library.unt.edu/ark:/67531/metadc925684/thumbnail/"/></a></p><p>This paper presents a theoretical framework for understanding plasma turbulence in astrophysical plasmas. It is motivated by observations of electromagnetic and density fluctuations in the solar wind, interstellar medium and galaxy clusters, as well as by models of particle heating in accretion disks. All of these plasmas and many others have turbulentmotions at weakly collisional and collisionless scales. The paper focuses on turbulence in a strong mean magnetic field. The key assumptions are that the turbulent fluctuations are small compared to the mean field, spatially anisotropic with respect to it and that their frequency is low compared to the ion cyclotron frequency. The turbulence is assumed to be forced at some system-specific outer scale. The energy injected at this scale has to be dissipated into heat, which ultimately cannot be accomplished without collisions. A kinetic cascade develops that brings the energy to collisional scales both in space and velocity. The nature of the kinetic cascade in various scale ranges depends on the physics of plasma fluctuations that exist there. There are four special scales that separate physically distinct regimes: the electron and ion gyroscales, the mean free path and the electron diffusion scale. In each of the scale ranges separated by these scales, the fully kinetic problem is systematically reduced to a more physically transparent and computationally tractable system of equations, which are derived in a rigorous way. In the "inertial range" above the ion gyroscale, the kinetic cascade separates into two parts: a cascade of Alfvenic fluctuations and a passive cascade of density and magnetic-fieldstrength fluctuations. The former are governed by the Reduced Magnetohydrodynamic (RMHD) equations at both the collisional and collisionless scales; the latter obey a linear kinetic equation along the (moving) field lines associated with the Alfvenic component (in the collisional limit, these compressive fluctuations become the slow and entropy modes of the conventional MHD). In the "dissipation range" below ion gyroscale, there are again two cascades: the kinetic-Alfven-wave (KAW) cascade governed by two fluid-like Electron Reduced Magnetohydrodynamic (ERMHD) equations and a passive cascade of ion entropy fluctuations both in space and velocity. The latter cascade brings the energy of the inertial-range fluctuations that was Landau-damped at the ion gyroscale to collisional scales in the phase space and leads to ion heating. The KAWenergy is similarly damped at the electron gyroscale and converted into electron heat. Kolmogorov-style scaling relations are derived for all of these cascades. The relationship between the theoretical models proposed in this paper and astrophysical applications and observations is discussed in detail.</p>Simulation of a Production Facility with an Automated Transport System2015-12-03T09:30:17-06:00https://digital.library.unt.edu/ark:/67531/metadc788537/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc788537/"><img alt="Simulation of a Production Facility with an Automated Transport System" title="Simulation of a Production Facility with an Automated Transport System" src="https://digital.library.unt.edu/ark:/67531/metadc788537/thumbnail/"/></a></p><p>A model was needed to assess material throughput and validate the conceptual design of a production facility, including equipment lists and layout. The initial desire was to use a commercially available discrete event simulation package. However, the available software was found to be too limited in capability. Database interface software was used to develop autonomous intelligent manufacturing workstations and material transporters. The initial Extend model used to assess material throughput and develop equipment lists for the preconceptual design effort was upgraded with software add-ons from Simulation Dynamics, Inc. (SDI). Use of the SDI database interface allowed the upgraded model to include: 1. a material mass balance at any level of detail required by the user, and 2. a transport system model that includes all transport system movements, time delays, and transfers between systems. This model will assist in evaluating transport system capacity, sensitive time delays in the system, and optimal operating strategies. An additional benefit of using the SDI database interface is dramatically improved run time performance. This allows significantly more runs to be completed to provide better statistics for overall plant performance. The model has all system and process parameters entered into sub-component accessible tables. All information for the manufactured items and process data is automatically generated and written to the database. The standard software is used for the movement of manufactured items between workstations, and for sequence and timing functions. Use of the database permits almost unlimited process control and data collection with an insignificant effect on run time.</p>EFFECTS OF XE ION IRRADIATION AND SUBSEQUENT ANNEALING ON THE PROPERTIES OF MAGNESIUM-ALUMINATE SPINEL2015-09-29T05:31:59-05:00https://digital.library.unt.edu/ark:/67531/metadc720544/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc720544/"><img alt="EFFECTS OF XE ION IRRADIATION AND SUBSEQUENT ANNEALING ON THE PROPERTIES OF MAGNESIUM-ALUMINATE SPINEL" title="EFFECTS OF XE ION IRRADIATION AND SUBSEQUENT ANNEALING ON THE PROPERTIES OF MAGNESIUM-ALUMINATE SPINEL" src="https://digital.library.unt.edu/ark:/67531/metadc720544/thumbnail/"/></a></p><p>Single crystals of magnesium-aluminate spinel MgAl{sub 2}O{sub 4} were irradiated with 340 keV Xe{sup 2} ions at {minus}173 C ({approximately} 100 K). A fluence of 1 x 10{sup 20} Xe/m{sup 2} created an amorphous layer at the surface of the samples. The samples were annealed for 1 h at different temperatures ranging from 130 C to 880 C. Recrystallization took place in the temperature interval between 610 C and 855 C. Transmission electron microscopy (TEM) images show two distinct layers near the surface: (1) a polycrystalline layer with columnar grain structure; and (2) a buried damaged layer epitaxial with the substrate. After annealing at 1100 C for 52 days, the profile of implanted Xe ions did not change, which means that Xe ions are not mobile in the spinel structure up to 1100 C. The thickness of the buried damaged layer decreased significantly in the 1100 C annealed sample comparing to the sample annealed for 1 h at 855 C.</p>Evaluation of the Cask Transportation Facility Modifications (CTFM) compliance to DOE order 6430.1A Project A.5 and A.62015-10-19T19:39:04-05:00https://digital.library.unt.edu/ark:/67531/metadc742163/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc742163/"><img alt="Evaluation of the Cask Transportation Facility Modifications (CTFM) compliance to DOE order 6430.1A Project A.5 and A.6" title="Evaluation of the Cask Transportation Facility Modifications (CTFM) compliance to DOE order 6430.1A Project A.5 and A.6" src="https://digital.library.unt.edu/ark:/67531/metadc742163/thumbnail/"/></a></p><p>This report was prepared to evaluate the compliance of CTFM to DOE Order 6430.1A. This document presents the results of an evaluation that was performed to assess compliance of the K West (KW) Cask Transportation Facility Modifications (CTFM) designs against applicable requirements of Department of Energy (DOE) Order 6430.1 A, General Design Criteria. This evaluation was grouped under two categories described as Cask Loadout System (CLS) and Cranes/Other Modifications.</p>Spent Nuclear Fuel (SNF) Project Cask and MCO Helium Purge System Design Review Completion Report Project A.5 and A.62015-10-19T19:39:04-05:00https://digital.library.unt.edu/ark:/67531/metadc735005/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc735005/"><img alt="Spent Nuclear Fuel (SNF) Project Cask and MCO Helium Purge System Design Review Completion Report Project A.5 and A.6" title="Spent Nuclear Fuel (SNF) Project Cask and MCO Helium Purge System Design Review Completion Report Project A.5 and A.6" src="https://digital.library.unt.edu/ark:/67531/metadc735005/thumbnail/"/></a></p><p>This report documents the results of the design verification performed on the Cask and Multiple Canister Over-pack (MCO) Helium Purge System. The helium purge system is part of the Spent Nuclear Fuel (SNF) Project Cask Loadout System (CLS) at 100K area. The design verification employed the ''Independent Review Method'' in accordance with Administrative Procedure (AP) EN-6-027-01.</p>FUTURE PLANS AT BNL: RHIC-II AND eRHIC.2016-09-22T02:13:12-05:00https://digital.library.unt.edu/ark:/67531/metadc886896/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc886896/"><img alt="FUTURE PLANS AT BNL: RHIC-II AND eRHIC." title="FUTURE PLANS AT BNL: RHIC-II AND eRHIC." src="https://digital.library.unt.edu/ark:/67531/metadc886896/thumbnail/"/></a></p><p>The development of future facilities relevant to the study of deep inelastic scattering at BNL is described.</p>Volatile organic compounds in indoor air: A review ofconcentrations measured in North America since 19902016-09-21T02:29:59-05:00https://digital.library.unt.edu/ark:/67531/metadc878750/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc878750/"><img alt="Volatile organic compounds in indoor air: A review ofconcentrations measured in North America since 1990" title="Volatile organic compounds in indoor air: A review ofconcentrations measured in North America since 1990" src="https://digital.library.unt.edu/ark:/67531/metadc878750/thumbnail/"/></a></p><p>Central tendency and upper limit concentrations of volatile organic compounds (VOCs) measured in indoor air are summarized and reviewed. Data were obtained from published cross-sectional studies of residential and office buildings conducted in North America from 1990through the present. VOC concentrations in existing residences reported in 12 studies comprise the majority of the data set. Central tendency and maximum concentrations are compared between new and existing residences and between existing residences and office buildings. Historical changes in indoor VOC concentrations since the Clean Air Act Amendments of 1990 are explored by comparing the current data set with two published reviews of previous data obtained primarily in the 1980s. These historical comparisons suggest average indoor concentrations of some toxic air contaminants, such as 1,1,1-trichloroethane have decreased.</p>Hydrogen Storage Properties of Magnesium Base Nanostructured Composite Materials2015-12-03T09:30:17-06:00https://digital.library.unt.edu/ark:/67531/metadc781808/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc781808/"><img alt="Hydrogen Storage Properties of Magnesium Base Nanostructured Composite Materials" title="Hydrogen Storage Properties of Magnesium Base Nanostructured Composite Materials" src="https://digital.library.unt.edu/ark:/67531/metadc781808/thumbnail/"/></a></p><p>In this work, nanostructured composite materials have been synthesized using the mechanical alloying process. The new materials produced have been investigated by X-ray diffraction (XRD), transition electron microscope (TEM), scanning electron microscope (SEM) and electron energy dispersion spectrum (EDS) for their phase compositions, crystal structure, grain size, particle morphology and the distribution of catalyst element. Hydrogen storage capacities and the hydriding-dehydriding kinetics of the new materials have been measured at different temperatures using a Sieverts apparatus. It is observed that mechanical alloying accelerates the hydrogenation kinetics of the magnesium based materials at low temperature, but a high temperature must be provided to release the absorbed hydrogen from the hydrided magnesium based materials. It is believed that the dehydriding temperature is largely controlled by the thermodynamic configuration of magnesium hydride. Doping Mg-Ni nano/amorphous composite materials with lanthanum reduces the hydriding and dehydriding temperature. Although the stability of MgH2 can not be easily reduced by ball milling alone, the results suggest the thermodynamic properties of Mg-Ni nano/amorphous composite materials can be alternated by additives such as La or other effective elements. Further investigation toward understanding the mechanism of additives will be rewarded.</p>Laser Hazard Analysis for Ultra-Fast Sub-Nanosecond, Mode-Locked Near Infrared Lasers Operated with Pulse Repetition Frequencies Above the Critical Frequency2015-10-18T18:40:23-05:00https://digital.library.unt.edu/ark:/67531/metadc740735/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc740735/"><img alt="Laser Hazard Analysis for Ultra-Fast Sub-Nanosecond, Mode-Locked Near Infrared Lasers Operated with Pulse Repetition Frequencies Above the Critical Frequency" title="Laser Hazard Analysis for Ultra-Fast Sub-Nanosecond, Mode-Locked Near Infrared Lasers Operated with Pulse Repetition Frequencies Above the Critical Frequency" src="https://digital.library.unt.edu/ark:/67531/metadc740735/thumbnail/"/></a></p><p>Ultra fast, sub-nanosecond (picosecond to femtosecond) duration, laser pulses present unique challenges when performing laser safety analysis involving mode-locked lasers, which operate at pulse repetition frequencies above the critical frequency in the near infrared wavelength bands. Two specific cases are presented, one such case that agrees and one that disagrees with the general rule on critical frequency. The results show that in all cases the appropriate maximum permissible exposure is always the smallest of the values calculated from ANSI rule 1, 2 and 3.</p>Power Technologies Energy Data Book - Third Edition2019-01-23T12:54:46-06:00https://digital.library.unt.edu/ark:/67531/metadc1408580/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1408580/"><img alt="Power Technologies Energy Data Book - Third Edition" title="Power Technologies Energy Data Book - Third Edition" src="https://digital.library.unt.edu/ark:/67531/metadc1408580/thumbnail/"/></a></p><p>This report, prepared by NREL's Energy Analysis Office, includes up-to-date information on power technologies, including complete technology profiles. The data book also contains charts on electricity restructuring, power technology forecasts, electricity supply, electricity capability, electricity generation, electricity demand, prices, economic indicators, environmental indicators, and conversion factors.</p>Search for Heavy, Long-Lived Neutralinos that Decay to Photons at CDF II Using Photon Timing2016-09-27T01:39:22-05:00https://digital.library.unt.edu/ark:/67531/metadc900889/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc900889/"><img alt="Search for Heavy, Long-Lived Neutralinos that Decay to Photons at CDF II Using Photon Timing" title="Search for Heavy, Long-Lived Neutralinos that Decay to Photons at CDF II Using Photon Timing" src="https://digital.library.unt.edu/ark:/67531/metadc900889/thumbnail/"/></a></p><p>The authors present the results of the first hadron collider search for heavy, long-lived neutralinos that decay via {tilde {chi}}{sub 1}{sup 0} {yields} {gamma}{tilde G} in gauge-mediated supersymmetry breaking models. Using an integrated luminosity of 570 {+-} 34 pb{sup -1} of p{bar p} collisions at {radical}s = 1.96 TeV, they select {gamma}+jet+missing transverse energy candidate events based on the arrival time of a high-energy photon at the electromagnetic calorimeter as measured with a timing system that was recently installed on the CDF II detector. They find 2 events, consistent with the background estimate of 1.3 {+-} 0.7 events. While the search strategy does not rely on model-specific dynamics, they set cross section limits and place the world-best 95% C.L. lower limit on the {tilde {chi}}{sub 1}{sup 0} mass of 101 GeV/c{sup 2} at {tau}{sub {tilde {chi}}{sub 1}{sup 0}} = 5 ns.</p>Measurement of Particle Production and Inclusive Differential Cross Sections in p anti-p Collisions at s**(1/2) = 1.96-TeV2016-11-13T19:26:23-06:00https://digital.library.unt.edu/ark:/67531/metadc927723/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc927723/"><img alt="Measurement of Particle Production and Inclusive Differential Cross Sections in p anti-p Collisions at s**(1/2) = 1.96-TeV" title="Measurement of Particle Production and Inclusive Differential Cross Sections in p anti-p Collisions at s**(1/2) = 1.96-TeV" src="https://digital.library.unt.edu/ark:/67531/metadc927723/thumbnail/"/></a></p><p>We report a set of measurements of particle production in inelastic p{bar p} collisions collected with a minimum-bias trigger at the Tevatron Collider with the CDF II experiment. The inclusive charged particle transverse momentum differential cross section is measured, with improved precision, over a range about ten times wider than in previous measurements. The former modeling of the spectrum appears to be incompatible with the high particle momenta observed. The dependence of the charged particle transverse momentum on the event particle multiplicity is analyzed to study the various components of hadron interactions. This is one of the observable variables most poorly reproduced by the available Monte Carlo generators. A first measurement of the event transverse energy sum differential cross section is also reported. A comparison with a PYTHIA prediction at the hadron level is performed. The inclusive charged particle differential production cross section is fairly well reproduced only in the transverse momentum range available from previous measurements. At higher momentum the agreement is poor. The transverse energy sum is poorly reproduced over the whole spectrum. The dependence of the charged particle transverse momentum on the particle multiplicity needs the introduction of more sophisticated particle production mechanisms, such as multiple parton interactions, in order to be better explained.</p>Search for the Rare Decays B^+ -> mu^+ mu^- K^+, B^0 -> mu^+ mu^- K^*0(892), and B^0_s -> mu^+ mu^- phi at CDF2016-09-27T01:39:22-05:00https://digital.library.unt.edu/ark:/67531/metadc893581/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc893581/"><img alt="Search for the Rare Decays B^+ -> mu^+ mu^- K^+, B^0 -> mu^+ mu^- K^*0(892), and B^0_s -> mu^+ mu^- phi at CDF" title="Search for the Rare Decays B^+ -> mu^+ mu^- K^+, B^0 -> mu^+ mu^- K^*0(892), and B^0_s -> mu^+ mu^- phi at CDF" src="https://digital.library.unt.edu/ark:/67531/metadc893581/thumbnail/"/></a></p><p>The authors search for b {yields} s{mu}{sup +}{mu}{sup -} transitions in B meson (B{sup +}, B{sup 0}, or B{sub s}{sup 0}) decays with 924 pb{sup -1} of p{bar p} collisions at {radical}s = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron. They find excesses with significances of 4.5, 2.9, and 2.4 standard deviations in the B{sup +} {yields} {mu}{sup +}{mu}{sup -}K{sup +}, B{sup 0} {yields} {mu}{sup +}{mu}{sup -}K*(892){sup 0}, and B{sub s}{sup 0} {yields} {mu}{sup +}{mu}{sup -}{phi} decay modes, respectively. Using B {yields} J/{psi}h (h - K{sup +}, K*(892){sup 0}, {phi}) decays as normalization channels, they report branching fractions for the previously observed B{sup +} and B{sup 0} decays as normalization channels, they report branching fractions for the previously observed B{sup +} and B{sup 0} decays, {Beta}(B{sup +} {yields} {mu}{sup +}{mu}{sup -}K{sup +}) = (0.59 {+-} 0.15 {+-} 0.04) x 10{sup -6}, and {Beta}(B{sup 0} {yields} {mu}{sup +}{mu}{sup -}K*(892){sup 0}) = (0.81 {+-} 0.30 {+-} 0.10) x 10{sup -6}, where the first uncertainty is statistical, and the second is systematic. These measurements are consistent with the world average results, and are competitive with the best available measurements. They set an upper limit on the relative branching fraction {Beta}(B{sub s}{sup 0}{yields}{mu}{sup +}{mu}{sup -}{phi})/{Beta}(B{sub s}{sup 0}{yields}J/{psi}{phi}) < 2.6(2.3) x 10{sup -3} at the 95(90)% confidence level, which is the most stringent to date.</p>Search for CP violation in semileptonic B(s)0 decays2016-11-13T19:26:23-06:00https://digital.library.unt.edu/ark:/67531/metadc933723/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc933723/"><img alt="Search for CP violation in semileptonic B(s)0 decays" title="Search for CP violation in semileptonic B(s)0 decays" src="https://digital.library.unt.edu/ark:/67531/metadc933723/thumbnail/"/></a></p><p>We have performed a search for CP violation in a sample of semileptonic B{sub s}{sup 0} decays corresponding to approximately 5 fb{sup -1} of data collected by the D0 detector in Run II at the Fermilab Tevatron Collider. A time-dependent fit to the distributions of the B{sub s}{sup 0} candidates yields the flavor-specific asymmetry a{sub fs}{sup s} = [-1.7 {+-} 9.1(stat){sub -2.3}{sup +1.2}(syst)] x 10{sup -3}. This is the most precise measurement to date of this CP violation parameter.</p>Measurement of the forward-backward charge asymmetry and extraction of $sin^2Theta^{eff}_W$ in $p\bar{p} \to Z/\gamma^{*}+X \to e^+e^-+X$ events produced at $\sqrt{s}=1.96$ TeV2016-09-27T01:39:22-05:00https://digital.library.unt.edu/ark:/67531/metadc901241/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc901241/"><img alt="Measurement of the forward-backward charge asymmetry and extraction of $sin^2Theta^{eff}_W$ in $p\bar{p} \to Z/\gamma^{*}+X \to e^+e^-+X$ events produced at $\sqrt{s}=1.96$ TeV" title="Measurement of the forward-backward charge asymmetry and extraction of $sin^2Theta^{eff}_W$ in $p\bar{p} \to Z/\gamma^{*}+X \to e^+e^-+X$ events produced at $\sqrt{s}=1.96$ TeV" src="https://digital.library.unt.edu/ark:/67531/metadc901241/thumbnail/"/></a></p><p>We present a measurement of the forward-backward charge asymmetry (A{sub FB}) in p{bar p} {yields} Z/{gamma}* + X {yields} e{sup +}e{sup -} + X events at a center-of-mass energy of 1.96 TeV using 1.1 fb{sup -1} of data collected with the D0 detector at the Fermilab Tevatron collider. A{sub FB} is measured as a function of the invariant mass of the electron-positron pair, and found to be consistent with the standard model prediction. We use the A{sub FB} measurement to extract the effective weak mixing angle sin{sup 2} {theta}{sub W}{sup eff} = 0.2327 {+-} 0.0018 (stat.) {+-} 0.0006 (syst.).</p>Measurement of the Lambda(b) lifetime in the exclusive decay Lambda(b) ---> J / psi Lambda2016-09-22T02:13:12-05:00https://digital.library.unt.edu/ark:/67531/metadc882058/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc882058/"><img alt="Measurement of the Lambda(b) lifetime in the exclusive decay Lambda(b) ---> J / psi Lambda" title="Measurement of the Lambda(b) lifetime in the exclusive decay Lambda(b) ---> J / psi Lambda" src="https://digital.library.unt.edu/ark:/67531/metadc882058/thumbnail/"/></a></p><p>We have measured the {lambda}{sub b} lifetime using the exclusive decay {lambda}{sub b}{yields}J/{psi}{lambda}, based on 1.2 fb{sup -1} of data collected with the D0 detector during 2002-2006. From 171 reconstructed {lambda}{sub b} decays, where the J/{psi} and {lambda} are identified via the decays J/{psi}{yields}{mu}{sup +}{mu}{sup -} and {lambda}{yields}p{pi}, we measured the {lambda}{sub b} lifetime to be {tau}({lambda}{sub b})=1.218{sub -0.115}{sup +0.130}(stat){+-}0.042(syst) ps. We also measured the B{sup 0} lifetime in the decay B{sup 0}{yields}J/{psi}({mu}{sup +}{mu}{sup -})K{sub S}{sup 0}({pi}{sup +}{pi}{sup -}) to be {tau}(B{sup 0})=1.501{sub -0.074}{sup +0.078}(stat){+-}0.050(syst) ps, yielding a lifetime ratio of {tau}({lambda}{sub b})/{tau}(B{sup 0})=0.811{sub -0.087}{sup +0.096}(stat){+-}0.034(syst = )</p>Measurement of the polarization of the $\Upsilon(1S)$ and $\Upsilon(2S)$ states in $p\bar{p}$ collisions at $\sqrt{s}=$1.96 TeV2016-09-27T01:39:22-05:00https://digital.library.unt.edu/ark:/67531/metadc894935/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc894935/"><img alt="Measurement of the polarization of the $\Upsilon(1S)$ and $\Upsilon(2S)$ states in $p\bar{p}$ collisions at $\sqrt{s}=$1.96 TeV" title="Measurement of the polarization of the $\Upsilon(1S)$ and $\Upsilon(2S)$ states in $p\bar{p}$ collisions at $\sqrt{s}=$1.96 TeV" src="https://digital.library.unt.edu/ark:/67531/metadc894935/thumbnail/"/></a></p><p>We present a study of the polarization of the {Upsilon}(1S) and {Upsilon}(2S) states using a 1.3 fb{sup -1} data sample collected by the D0 experiment in 2002-2006 during Run II of the Fermilab Tevatron Collider. We measure the polarization parameter {alpha} = ({sigma}{sub T} - 2{sigma}{sub L})/({sigma}{sub T} + 2{sigma}{sub L}), where {sigma}{sub T} and {sigma}{sub L} are the transversely and longitudinally polarized components of the production cross section, as a function of the transverse momentum (p{sub T}{sup {Upsilon}}) for the {Upsilon}(1S) and {Upsilon}(2S). Significant p{sub T}{sup {Upsilon}}-dependent longitudinal polarization is observed for the {Upsilon}(1S). A comparison with theoretical models is presented.</p>Measurement of the t anti-t production cross section in p anti-p collisions at s**(1/2) = 1.96 = TeV using kinematic characteristics of lepton + jets events2019-01-23T12:54:46-06:00https://digital.library.unt.edu/ark:/67531/metadc1415679/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1415679/"><img alt="Measurement of the t anti-t production cross section in p anti-p collisions at s**(1/2) = 1.96 = TeV using kinematic characteristics of lepton + jets events" title="Measurement of the t anti-t production cross section in p anti-p collisions at s**(1/2) = 1.96 = TeV using kinematic characteristics of lepton + jets events" src="https://digital.library.unt.edu/ark:/67531/metadc1415679/thumbnail/"/></a></p><p>We present a measurement of the top quark pair (t{bar t}) production cross section ({sigma}{sub t{bar t}}) in p{bar p} collisions at a center-of-mass energy of 1.96 TeV using 230 pb{sub -1} of data collected by the D0 detector at the Fermilab Tevatron Collider. We select events with one charged lepton (electron or muon), large missing transverse energy, and at least four jets, and extract the t{bar t} content of the sample based on the kinematic characteristics of the events. For a top quark mass of 175 GeV, we measure {sigma}{sub t{bar t}} = 6.7{sub -1.3}{sup +1.4}(stat){sub -1.1}{sup +1.6}(syst) {+-} 0.4(lumi)pb, in good agreement with the standard model prediction.</p>Measurement of the t anti-t production cross section in p anti-p collisions at s**(1/2) = 1.96-TeV using lepton + jets events with lifetime b-tagging2019-01-23T12:54:46-06:00https://digital.library.unt.edu/ark:/67531/metadc1404696/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1404696/"><img alt="Measurement of the t anti-t production cross section in p anti-p collisions at s**(1/2) = 1.96-TeV using lepton + jets events with lifetime b-tagging" title="Measurement of the t anti-t production cross section in p anti-p collisions at s**(1/2) = 1.96-TeV using lepton + jets events with lifetime b-tagging" src="https://digital.library.unt.edu/ark:/67531/metadc1404696/thumbnail/"/></a></p><p>We present a measurement of the top quark pair (t{bar t}) production cross section ({sigma}{sub t{bar t}}) in p{bar p} collisions at {radical}s = 1.96 TeV using 230 pb{sup -1} of data collected by the D0 experiment at the Fermilab Tevatron Collider. We select events with one charged lepton (electron or muon), missing transverse energy, and jets in the final state. We employ lifetime-based b-jet identification techniques to further enhance the t{bar t} purity of the selected sample. For a top quark mass of 175 GeV, we measure {sigma}{sub t{bar t}} = 8.6{sub -1.5}{sup +1.6}(stat. + syst.) {+-} 0.6 (lumi.) pb, in agreement with the standard model expectation.</p>Multivariate searches for single top quark production with the D0 detector2016-09-21T02:29:59-05:00https://digital.library.unt.edu/ark:/67531/metadc882771/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc882771/"><img alt="Multivariate searches for single top quark production with the D0 detector" title="Multivariate searches for single top quark production with the D0 detector" src="https://digital.library.unt.edu/ark:/67531/metadc882771/thumbnail/"/></a></p><p>We present a search for electroweak production of single top quarks in (p{bar p} {yields} t{bar b} + X) and t-channel (p{bar p} {yields} tq{bar b} + X) modes. We have analyzed 230 pb{sup -1} of data collected with the D0 detector at the Fermilab Tevatron collider at a center-of-mass energy of {radical}s = 1.96 TeV. Two separate analysis methods are used: neural networks and a cut-based analysis. No evidence for a single top quark signal is found. We set 95% confidence level upper limits on the production cross sections using Bayesian statistics, based on event counts and binned likelihoods formed from the neural network output. The limits from the neural network (cut-based) analysis are 6.4 pb (10.6 pb) in the s-channel and 5.0 pb (11.3 pb) in the t-channel.</p>A Precise measurement of the B0(s) lifetime2016-09-21T02:29:59-05:00https://digital.library.unt.edu/ark:/67531/metadc883367/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc883367/"><img alt="A Precise measurement of the B0(s) lifetime" title="A Precise measurement of the B0(s) lifetime" src="https://digital.library.unt.edu/ark:/67531/metadc883367/thumbnail/"/></a></p><p>The authors report a measurement of the B{sub s}{sup 0} lifetime in the semileptonic decay channel B{sub s}{sup 0} {yields} D{sub s}{sup -}{mu}{sup +}{nu}X (and its charge conjugate), using approximately 0.4 fb{sup -1} of data collected with the D0 detector during 2002-2004. They have reconstructed 5176 D{sub s}{sup -} {mu}{sup +} signal events, where the D{sub s}{sup -} is identified via the decay D{sub s}{sup 0} {yields} {phi}{pi}{sup -}, followed by {phi} {yields} K{sup +}K{sup -}. Using these events, they have measured the B{sub s}{sup 0} lifetime to be {tau}(B{sub s}{sup 0}) = 1.398 {+-} 0.044 (stat){sub -0.025}{sup +0.028}(syst) ps. This is the most precise measurement of the B{sub s}{sup 0} lifetime to date.</p>Production of WZ events in p anti-p collisions at s**(1/2) = 1.96-TeV and limits on anomalous WWZ couplings2019-01-23T12:54:46-06:00https://digital.library.unt.edu/ark:/67531/metadc1408194/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1408194/"><img alt="Production of WZ events in p anti-p collisions at s**(1/2) = 1.96-TeV and limits on anomalous WWZ couplings" title="Production of WZ events in p anti-p collisions at s**(1/2) = 1.96-TeV and limits on anomalous WWZ couplings" src="https://digital.library.unt.edu/ark:/67531/metadc1408194/thumbnail/"/></a></p><p>The authors present results from a search for WZ production with subsequent decay to {ell}{nu}{ell}'{bar {ell}}' ({ell} and {ell}' = e or {mu}) using 0.30 fb{sup -1} of data collected by the D0 experiment between 2002 and 2004 at the Tevatron. Three events with WZ decay characteristics are observed. With an estimated background of 0.71 {+-} 0.08 events, we measure the WZ production cross section to be 4.5{sub -2.6}{sup +3.8} pb, with a 95% C.L. upper limit of 13.3 pb. The 95% C.L. limits for anomalous WWZ couplings are found to be -2.0 < {Delta}{kappa}{sub Z} < 2.4 for form factor scale {Lambda} = 1 TeV, and -0.48 < {lambda}{sub Z} < 0.48 and -0.49 < {Delta}g{sub 1}{sup Z} < 0.66 for {Lambda} = 1.5 TeV.</p>Search for a Higgs boson produced in association with a Z boson in p anti-p collisions2016-09-22T02:13:12-05:00https://digital.library.unt.edu/ark:/67531/metadc888130/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc888130/"><img alt="Search for a Higgs boson produced in association with a Z boson in p anti-p collisions" title="Search for a Higgs boson produced in association with a Z boson in p anti-p collisions" src="https://digital.library.unt.edu/ark:/67531/metadc888130/thumbnail/"/></a></p><p>We describe a search for the standard model Higgs boson with a mass of 105 GeV/c{sup 2} to 145 GeV/c{sup 2} in data corresponding to an integrated luminosity of approximately 450 pb{sup -1} collected with the D0 detector at the Fermilab Tevatron p{bar p} collider at a center-of-mass energy of 1.96 TeV. The Higgs boson is required to be produced in association with a Z boson, and the Z boson is required to decay to either electrons or muons with the Higgs boson decaying to a b{bar b} pair. The data are well described by the expected background, leading to 95% confidence level cross section upper limits {sigma}p{bar p} {yields} ZH x B(H {yields} b{bar b}) in the range of 3.1 pb to 4.4 pb.</p>Search for excited muons in p anti-p collisions at s**(1/2) = 1.96- TeV2016-09-21T02:29:59-05:00https://digital.library.unt.edu/ark:/67531/metadc884106/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc884106/"><img alt="Search for excited muons in p anti-p collisions at s**(1/2) = 1.96- TeV" title="Search for excited muons in p anti-p collisions at s**(1/2) = 1.96- TeV" src="https://digital.library.unt.edu/ark:/67531/metadc884106/thumbnail/"/></a></p><p>We present the results of a search for the production of an excited state of the muon, {mu}*, in proton antiproton collisions at {radical}s = 1.96 TeV. The data have been collected with the D0 experiment at the Fermilab Tevatron Collider and correspond to an integrated luminosity of approximately 380 pb{sup -1}. We search for {mu}* in the process p{bar p} {yields} {mu}*{nu}, with the {mu}* subsequently decaying to a muon plus photon. No excess above the standard model expectation is observed in data. Interpreting our data in the context of a model that describes {mu}* production by four-fermion contact interactions and {mu}* decay via electroweak processes, we exclude production cross sections higher than 0.057 pb-0.112 pb at the 95% confidence level, depending on the mass of the excited muon. Choosing the scale for contact interactions to be {Lambda} = 1 TeV, excited muon masses below 618 GeV are excluded.</p>Search for neutral supersymmetric Higgs bosons in multijet events at s**(1/2) = 1.96-TeV2019-01-23T12:54:46-06:00https://digital.library.unt.edu/ark:/67531/metadc1405041/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1405041/"><img alt="Search for neutral supersymmetric Higgs bosons in multijet events at s**(1/2) = 1.96-TeV" title="Search for neutral supersymmetric Higgs bosons in multijet events at s**(1/2) = 1.96-TeV" src="https://digital.library.unt.edu/ark:/67531/metadc1405041/thumbnail/"/></a></p><p>We have performed a search for neutral Higgs bosons produced in association with bottom quarks in p{bar p} collisions, using 260 pb{sup -1} of data collected with the D0 detector in Run II of the Fermilab Tevatron Collider. The cross sections for these processes are enhanced in many extensions of the standard model (SM), such as in its minimal supersymmetric extension at large tan {beta}. The results of our analysis agree with expectations from the SM, and we use our measurements to set upper limits on the production of neutral Higgs bosons in the mass range of 90 to 150 GeV.</p>Search for supersymmetry via associated production of charginos and neutralinos in final states with three leptons2019-01-23T12:54:46-06:00https://digital.library.unt.edu/ark:/67531/metadc1412036/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1412036/"><img alt="Search for supersymmetry via associated production of charginos and neutralinos in final states with three leptons" title="Search for supersymmetry via associated production of charginos and neutralinos in final states with three leptons" src="https://digital.library.unt.edu/ark:/67531/metadc1412036/thumbnail/"/></a></p><p>None</p>The Low-Income Home Energy Assistance Program: How are State Allotments Determined?2016-06-02T05:26:07-05:00https://digital.library.unt.edu/ark:/67531/metadc847550/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc847550/"><img alt="The Low-Income Home Energy Assistance Program: How are State Allotments Determined?" title="The Low-Income Home Energy Assistance Program: How are State Allotments Determined?" src="https://digital.library.unt.edu/ark:/67531/metadc847550/thumbnail/"/></a></p><p>This report discusses the Low-Income Home Energy Assistance Program (LIHEAP), which is a block grant program under which the federal government provides states annual grants to operate multi-component home energy assistance programs for needy households.</p>Radiological Dose Calculations for Fusion Facilities2016-09-22T02:13:12-05:00https://digital.library.unt.edu/ark:/67531/metadc877269/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc877269/"><img alt="Radiological Dose Calculations for Fusion Facilities" title="Radiological Dose Calculations for Fusion Facilities" src="https://digital.library.unt.edu/ark:/67531/metadc877269/thumbnail/"/></a></p><p>This report summarizes the results and rationale for radiological dose calculations for the maximally exposed individual during fusion accident conditions. Early doses per unit activity (Sieverts per TeraBecquerel) are given for 535 magnetic fusion isotopes of interest for several release scenarios. These data can be used for accident assessment calculations to determine if the accident consequences exceed Nuclear Regulatory Commission and Department of Energy evaluation guides. A generalized yearly dose estimate for routine releases, based on 1 Terabecquerel unit releases per radionuclide, has also been performed using averaged site parameters and assumed populations. These routine release data are useful for assessing designs against US Environmental Protection Agency yearly release limits.</p>Anode Sheath Switching in a Carbon Nanotube Arc Plasma2016-11-13T19:26:23-06:00https://digital.library.unt.edu/ark:/67531/metadc935475/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc935475/"><img alt="Anode Sheath Switching in a Carbon Nanotube Arc Plasma" title="Anode Sheath Switching in a Carbon Nanotube Arc Plasma" src="https://digital.library.unt.edu/ark:/67531/metadc935475/thumbnail/"/></a></p><p>The anode ablation rate is investigated as a function of anode diameter for a carbon nanotube arc plasma. It is found that anomalously high ablation occurs for small anode diameters. This result is explained by the formation of a positive anode sheath. The increased ablation rate due to this positive anode sheath could imply greater production rate for carbon nanotubes.</p>Electric Transmission: Approaches for Energizing a Sagging Industry2016-03-19T13:57:26-05:00https://digital.library.unt.edu/ark:/67531/metadc813011/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc813011/"><img alt="Electric Transmission: Approaches for Energizing a Sagging Industry" title="Electric Transmission: Approaches for Energizing a Sagging Industry" src="https://digital.library.unt.edu/ark:/67531/metadc813011/thumbnail/"/></a></p><p>This report discusses factors that have contributed to the lack of new transmission capacity and some of the resulting issues. This report reviews approaches being taken to address the lack of investment in transmission infrastructure and transmission congestion.</p>Electric Utility Regulatory Reform: Issues for the 109th Congress2016-01-13T14:26:20-06:00https://digital.library.unt.edu/ark:/67531/metadc795552/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc795552/"><img alt="Electric Utility Regulatory Reform: Issues for the 109th Congress" title="Electric Utility Regulatory Reform: Issues for the 109th Congress" src="https://digital.library.unt.edu/ark:/67531/metadc795552/thumbnail/"/></a></p><p>This report discusses regulation issues affecting electricity today. Comprehensive electricity legislation may involve several components: Public Utility Holding Company Act (PUHCA) reform, PURPA's requirement that utilities purchase power from qualifying facilities (QFs), and reliability.</p>Electricity: The Road Toward Restructuring2005-06-11T06:47:01-05:00https://digital.library.unt.edu/ark:/67531/metacrs4437/<p><a href="https://digital.library.unt.edu/ark:/67531/metacrs4437/"><img alt="Electricity: The Road Toward Restructuring" title="Electricity: The Road Toward Restructuring" src="https://digital.library.unt.edu/ark:/67531/metacrs4437/thumbnail/"/></a></p><p>The Public Utility Holding Company Act of 1935 (PUHCA) and the Federal Power Act (FPA) were enacted to eliminate unfair practices and other abuses by electricity and gas holding companies by requiring federal control and regulation of interstate public utility holding companies. Comprehensive energy legislation has passed the House and Senate. The House passed H.R. 6 on April 11, 2003. On July 31, 2003, the Senate suspended debate on S. 14, inserted the text of H.R. 4 (107th Congress) as a substitute, and passed H.R. 6. A conference agreement was reached November 17, 2003, and passed by the House the next day. H.R. 6 includes an electricity title that would, in part, repeal PUHCA, would prospectively repeal the mandatory purchase requirement under PURPA, and would create an electric reliability organization. On June 15, 2004, H.R. 4503, a comprehensive energy policy bill, passed the House.</p>Electric Utility Infrastructure Vulnerabilities: Transformers, Towers, and Terrorism2016-03-19T13:57:26-05:00https://digital.library.unt.edu/ark:/67531/metadc807647/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc807647/"><img alt="Electric Utility Infrastructure Vulnerabilities: Transformers, Towers, and Terrorism" title="Electric Utility Infrastructure Vulnerabilities: Transformers, Towers, and Terrorism" src="https://digital.library.unt.edu/ark:/67531/metadc807647/thumbnail/"/></a></p><p>None</p>Ideas and concepts for diagnosis of performance and evaluation of data reliability based upon ARSA state-of-health (SOH) data2015-09-12T06:31:14-05:00https://digital.library.unt.edu/ark:/67531/metadc707638/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc707638/"><img alt="Ideas and concepts for diagnosis of performance and evaluation of data reliability based upon ARSA state-of-health (SOH) data" title="Ideas and concepts for diagnosis of performance and evaluation of data reliability based upon ARSA state-of-health (SOH) data" src="https://digital.library.unt.edu/ark:/67531/metadc707638/thumbnail/"/></a></p><p>At the current time, the Pacific Northwest National Laboratory (PNNL) prototype for the Automated Radioxenon Sampler/Analyzer (ARSA) automatically transmits, on a daily basis, a subset of all state-of-health (SOH) data in an e-mail data file to a limited number of recipients. These variables represent what were considered the most critical physical parameters for the ARSA's operation at the beginning of the field demonstration in Freiburg, Germany. Operators at PNNL perform a daily review of the information in the data file for anomalous operational conditions as evidenced by sensor readings. The initial review is easily implemented by plotting the various sensor data versus time and looking for gross deviations in the periodicity of the variables compared to previous sample sensor data. After viewing the 24-hr graphical plots, if necessary, a review is conducted of the tabular data of specific sensor anomalies. In most cases, the experience has been that when there is an ARSA operational problem the data file will have multiple sensor readings that reflect some aspect of the problem.</p>Ideas and Concepts for Diagnosis of Performance and Evaluation of Data Reliability Based Upon ARSA State-of-Health (SOH) Data2019-01-12T16:41:59-06:00https://digital.library.unt.edu/ark:/67531/metadc1394418/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1394418/"><img alt="Ideas and Concepts for Diagnosis of Performance and Evaluation of Data Reliability Based Upon ARSA State-of-Health (SOH) Data" title="Ideas and Concepts for Diagnosis of Performance and Evaluation of Data Reliability Based Upon ARSA State-of-Health (SOH) Data" src="https://digital.library.unt.edu/ark:/67531/metadc1394418/thumbnail/"/></a></p><p>At the current time the Pacific Northwest National Laboratory (PNNL) prototype for the Automated Radioxenon Sampler/Analyzer (ARSA) automatically transmits, on a daily basis, a subset of all state-of-health (SOH) data in an e-mail data file to a limited distribution of participants.</p>Abilene Philharmonic Playbill: April 6-May 4, 20022015-07-06T21:42:26-05:00https://texashistory.unt.edu/ark:/67531/metapth623064/<p><a href="https://texashistory.unt.edu/ark:/67531/metapth623064/"><img alt="Abilene Philharmonic Playbill: April 6-May 4, 2002" title="Abilene Philharmonic Playbill: April 6-May 4, 2002" src="https://texashistory.unt.edu/ark:/67531/metapth623064/thumbnail/"/></a></p><p>Program for an Abilene Philharmonic concert that ran from April 6th to May 4th during the 51st season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.</p>Abilene Philharmonic Playbill: April 2-May 7, 20052015-07-06T21:42:26-05:00https://texashistory.unt.edu/ark:/67531/metapth623309/<p><a href="https://texashistory.unt.edu/ark:/67531/metapth623309/"><img alt="Abilene Philharmonic Playbill: April 2-May 7, 2005" title="Abilene Philharmonic Playbill: April 2-May 7, 2005" src="https://texashistory.unt.edu/ark:/67531/metapth623309/thumbnail/"/></a></p><p>Program for an Abilene Philharmonic concert that ran from April 2nd to May 7th during the 55th season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.</p>Abilene Philharmonic Playbill: April 22, 20062015-07-06T21:42:26-05:00https://texashistory.unt.edu/ark:/67531/metapth623084/<p><a href="https://texashistory.unt.edu/ark:/67531/metapth623084/"><img alt="Abilene Philharmonic Playbill: April 22, 2006" title="Abilene Philharmonic Playbill: April 22, 2006" src="https://texashistory.unt.edu/ark:/67531/metapth623084/thumbnail/"/></a></p><p>Program for an Abilene Philharmonic concert that ran on April 22nd (Pop III) during the 56th season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.</p>Measurement of direct photon emission in the K(L) ---> pi+ pi- gamma decay mode2016-09-21T02:29:59-05:00https://digital.library.unt.edu/ark:/67531/metadc882788/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc882788/"><img alt="Measurement of direct photon emission in the K(L) ---> pi+ pi- gamma decay mode" title="Measurement of direct photon emission in the K(L) ---> pi+ pi- gamma decay mode" src="https://digital.library.unt.edu/ark:/67531/metadc882788/thumbnail/"/></a></p><p>In this paper the KTeV collaboration reports the analysis of 112.1 x 10{sup 3} candidate K{sub L} {yields} {pi}{sup +}{pi}{sup -}{gamma} decays including a background of 671 {+-} 41 events with the objective of determining the photon production mechanisms intrinsic to the decay process. These decays have been analyzed to extract the relative contributions of the Cp violating bremsstrahlung process and the CP conserving M1 and CP violating E1 direct photon emission processes. The M1 direct photon emission amplitude and its associated vector form factor parameterized as |{bar g}{sub M1}|(1 + a{sub 1}/a{sub 2}/(M{sub {rho}}{sup 2}-M{sub K}{sup 2}) + 2M{sub K}E{sub {gamma}}) have been measured to be |{bar g}{sub M1}| = 1.198 {+-} 0.035(stat) {+-} 0.086(syst) and a{sub 1}/a{sub 2} = =0.738 {+-} 0.007(stat) {+-} 0.018(syst) GeV{sup 2}/c{sup 2} respectively. An upper limit for the CP violating E1 direct emission amplitude |g{sub E1}| {le} 0.1 (90%CL) has been found. The overall ratio of direct photon emission (DE) to total photon emission including the bremsstrahlung process (IB) has been determined to be DE/(DE + IB) = 0.689 {+-} 0.021 for E{sub {gamma}} {ge} 20 MeV.</p>Air to Blood Distribution of Volatile Organic Compounds: A Linear Free Energy Analysis2014-07-18T11:30:51-05:00https://digital.library.unt.edu/ark:/67531/metadc307096/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc307096/"><img alt="Air to Blood Distribution of Volatile Organic Compounds: A Linear Free Energy Analysis" title="Air to Blood Distribution of Volatile Organic Compounds: A Linear Free Energy Analysis" src="https://digital.library.unt.edu/ark:/67531/metadc307096/thumbnail/"/></a></p><p>Article on air to blood distribution of volatile organic compounds and a linear free energy analysis.</p>Air to Muscle and Blood/Plasma to Muscle Distribution of Volatile Organic Compounds and Drugs: Linear Free Energy Analyses2014-10-23T12:02:27-05:00https://digital.library.unt.edu/ark:/67531/metadc406343/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc406343/"><img alt="Air to Muscle and Blood/Plasma to Muscle Distribution of Volatile Organic Compounds and Drugs: Linear Free Energy Analyses" title="Air to Muscle and Blood/Plasma to Muscle Distribution of Volatile Organic Compounds and Drugs: Linear Free Energy Analyses" src="https://digital.library.unt.edu/ark:/67531/metadc406343/thumbnail/"/></a></p><p>Article on air to muscle and blood/plasma to muscle distribution of volatile organic compounds and drugs and linear free energy analyses.</p>Correlation and Prediction of Partition Coefficients from the Gas Phase and from Water to Alkan-1-ols2014-07-07T08:20:43-05:00https://digital.library.unt.edu/ark:/67531/metadc306053/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc306053/"><img alt="Correlation and Prediction of Partition Coefficients from the Gas Phase and from Water to Alkan-1-ols" title="Correlation and Prediction of Partition Coefficients from the Gas Phase and from Water to Alkan-1-ols" src="https://digital.library.unt.edu/ark:/67531/metadc306053/thumbnail/"/></a></p><p>Article discussing correlation and prediction of partition coefficients from the gas phase and from water to alkan-1-ols.</p>Polycube Oxidation and Factors Affecting the Concentrations of Gaseous Products2019-01-23T12:54:46-06:00https://digital.library.unt.edu/ark:/67531/metadc1408966/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1408966/"><img alt="Polycube Oxidation and Factors Affecting the Concentrations of Gaseous Products" title="Polycube Oxidation and Factors Affecting the Concentrations of Gaseous Products" src="https://digital.library.unt.edu/ark:/67531/metadc1408966/thumbnail/"/></a></p><p>The degraded polycube samples were tested in air and argon/oxygen atmospheres to determine the effect of size increase on the flammable gases concentrations. Within the size range tested, the flammable gas generation rate increases with increasing size but the extrapolation of the data to actual processing polycube size yielded flammable gas species concentration in the off-gas stream below the lower flammable limit of all the major gas species identified. Extreme surface area increase with a powder sample showed no significant effect on the flammable gas generation rate. The polycube went through the thermal stabilization process by undergoing both pyrolysis and oxidation generating at the end a plutonium oxide powder that showed unmeasurable weight change at 1273 K.</p>