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Measurement of the Inelastic Proton-Proton Cross-Section at sqrt{s}=7 TeV with the ATLAS Detector
None
Date:
June 5, 2013
Creator:
Aad, Georges
Object Type:
Article
System:
The UNT Digital Library
Pressure-induced isostructural transition in PdN2
We show that a synthesized Pd-N compound crystallize into the pyrite structure by comparison of experimental and calculated Raman intensities. The decreasing Raman intensities with decreasing pressure is explained by a closing of the fundamental band gap. We further discuss the experimental decomposition of this compound at 11 GPa in terms of an isostructural transition within the pyrite structure.
Date:
March 5, 2010
Creator:
Aberg, D; Erhart, P; Crowhurst, J; Zaug, J M; Goncharov, A F & Sadigh, B
Object Type:
Article
System:
The UNT Digital Library
RECERTIFICATION OF THE MODEL 9977 RADIOACTIVE MATERIAL PACKAGING
The Model 9977 Packaging was initially issued a Certificate of Compliance (CoC) by the Department of Energy’s Office of Environmental Management (DOE-EM) for the transportation of radioactive material (RAM) in the Fall of 2007. This first CoC was for a single radioactive material and two packing configurations. In the five years since that time, seven Addendums have been written to the Safety Analysis Report for Packaging (SARP) and five Letter Amendments have been written that have authorized either new RAM contents or packing configurations, or both. This paper will discuss the process of updating the 9977 SARP to include all the contents and configurations, including the addition of a new content, and its submittal for recertification.
Date:
June 5, 2013
Creator:
Abramczyk, G.; Bellamy, S.; Loftin, B. & Nathan, S.
Object Type:
Article
System:
The UNT Digital Library
PRECEDENTS FOR AUTHORIZATION OF CONTENTS USING DOSE RATE MEASUREMENTS
For the transportation of Radioactive Material (RAM) packages, the requirements for the maximum allowed dose rate at the package surface and in its vicinity are given in Title 10 of the Code of Federal Regulations, Section 71.47. The regulations are based on the acceptable dose rates to which the public, workers, and the environment may be exposed. As such, the regulations specify dose rates, rather than quantity of radioactive isotopes and require monitoring to confirm the requirements are met. 10CFR71.47 requires that each package of radioactive materials offered for transportation must be designed and prepared for shipment so that under conditions normally incident to transportation the radiation level does not exceed 2 mSv/h (200 mrem/h) at any point on the external Surface of the package, and the transport index does not exceed 10. Before shipment, the dose rate of the package is determined by measurement, ensuring that it conforms to the regulatory limits, regardless of any analyses. This is the requirement for all certified packagings. This paper discusses the requirements for establishing the dose rates when shipping RAM packages and the precedents for meeting these requirements by measurement.
Date:
June 5, 2012
Creator:
Abramczyk, G.; Bellamy, S.; Nathan, S. & Loftin, B.
Object Type:
Article
System:
The UNT Digital Library
Discovery of Very High Energy Gamma Rays from PKS 1424+240 and Multiwavelength Constraints on its Redshift
We report the first detection of very-high-energy (VHE) gamma-ray emission above 140GeV from PKS 1424+240, a BL Lac object with an unknown redshift. The photon spectrum above 140GeV measured by VERITAS is well described by a power law with a photon index of 3.8 {+-}0.5{sub stat} {+-} 0.3{sub syst} and a flux normalization at 200 GeV of (5.1 {+-} 0.9{sub stat} {+-} 0.5{sub syst}) x 10{sup -11} TeV{sup -1} cm{sup -2} s{sup -1}, where stat and syst denote the statistical and systematical uncertainty, respectively. The VHE flux is steady over the observation period between MJD 54881 and 55003 (2009 February 19 to June 21). Flux variability is also not observed in contemporaneous high energy observations with the Fermi Large Area Telescope (LAT). Contemporaneous X-ray and optical data were also obtained from the Swift XRT and MDM observatory, respectively. The broadband spectral energy distribution (SED) is well described by a one-zone synchrotron self-Compton (SSC) model favoring a redshift of less than 0.1. Using the photon index measured with Fermi in combination with recent extragalactic background light (EBL) absorption models it can be concluded from the VERITAS data that the redshift of PKS 1424+240 is less than 0.66.
Date:
April 5, 2012
Creator:
Acciari, V. A.; Aliu, E.; Arlen, T.; Aune, T.; Bautista, M.; Beilicke, M. et al.
Object Type:
Report
System:
The UNT Digital Library
Generalized molecular solvation in non-aqueous solutions by a single parameter implicit solvation scheme
Article presenting a systematic parametrization protocol for the Self-Consistent Continuum Solvation (SCCS) model resulting in optimized parameters for 67 non-aqueous solvents. The parametrization is based on a collection of ≈6000 experimentally measured partition coefficients, which were collected in the Solv@TUM database presented here. The accuracy of the optimized SCCS model is comparable to the well-known universal continuum solvation model (SMx) family of methods, while relying on only a single fit parameter and thereby largely reducing statistical noise.
Date:
August 3, 2018
Creator:
Acree, William E. (William Eugene); Hille, Christoph; Ringe, Stefan; Deimel, Martin; Kunkel, Christian; Reuter, Karsten et al.
Object Type:
Article
System:
The UNT Digital Library
Student Recital: 2017-03-05 – Evan O. Adams, composer; Grant A. Carrington, composer; Austin Poorbaugh, composer; Austin Simonds, composer; and John Snyder, composer
Recital performed at the UNT College of Music Voertman Hall.
Date:
April 5, 2017
Creator:
Adams, Evan O.; Carrington, Grant A.; Poorbaugh, Austin; Simonds, Austin & Snyder, John
Object Type:
Sound
System:
The UNT Digital Library
Attrition Resistant Fischer-Tropsch Catalysts Based on FCC Supports
Commercial spent fluid catalytic cracking (FCC) catalysts provided by Engelhard and Albemarle were used as supports for Fe-based catalysts with the goal of improving the attrition resistance of typical F-T catalysts. Catalysts with the Ruhrchemie composition (100 Fe/5 Cu/4.2 K/25 spent FCC on mass basis) were prepared by wet impregnation. XRD and XANES analysis showed the presence of Fe{sub 2}O{sub 3} in calcined catalysts. FeC{sub x} and Fe{sub 3}O{sub 4} were present in the activated catalysts. The metal composition of the catalysts was analyzed by ICP-MS. F-T activity of the catalysts activated in situ in CO at the same conditions as used prior to the attrition tests was measured using a fixed bed reactor at T = 573 K, P = 1.38 MPa and H{sub 2}:CO ratio of 0.67. Cu and K promoted Fe supported over Engelhard provided spent FCC catalyst shows relatively good attrition resistance (8.2 wt% fines lost), high CO conversion (81%) and C{sub 5}+ hydrocarbons selectivity (18.3%).
Date:
February 5, 2010
Creator:
Adeyiga, Adeyinka
Object Type:
Report
System:
The UNT Digital Library
Improving Conservation for First-Order System Least Squares Finite-Element Methods
None
Date:
September 5, 2012
Creator:
Adler, J H & Vassilevski, P S
Object Type:
Article
System:
The UNT Digital Library
Improved resolution of hydrocarbon structures and constitutional isomers in complex mixtures using Gas Chromatography-Vacuum Ultraviolet-Mass Spectrometry (GC-VUV-MS) (Supplementary Info)
Understanding the composition of complex hydrocarbon mixtures is important for environmental studies in a variety of fields, but many prevalent compounds cannot be confidently identified using traditional gas chromatography-mass spectrometry (GC-MS) techniques. This work uses vacuum-ultraviolet (VUV) ionization to elucidate the structures of a traditionally"unresolved complex mixture" by separating components by GC retention time, tR, and mass-to-charge ratio, m/Q, which are used to determine carbon number, NC, and the number of rings and double bonds, NDBE. Constitutional isomers are resolved based on tR, enabling the most complete quantitative analysis to date of structural isomers in an environmentally-relevant hydrocarbon mixture. Unknown compounds are classified in this work by carbon number, degree of saturation, presence of rings, and degree of branching, providing structural constraints. The capabilities of this analysis are explored using diesel fuel, in which constitutional isomer distribution patterns are shown to be reproducible between carbon numbers and follow predictable rules. Nearly half of the aliphatic hydrocarbon mass is shown to be branched, suggesting branching is more important in diesel fuel than previously shown. The classification of unknown hydrocarbons and the resolution of constitutional isomers significantly improves resolution capabilities for any complex hydrocarbon mixture.
Date:
September 5, 2011
Creator:
Aerosol Dynamics Inc.,; Aerodyne Research, Inc.,; Tofwerk AG, Thun, Switzerland; Isaacman, Gabriel; Wilson, Kevin R.; Chan, Arthur W. H. et al.
Object Type:
Article
System:
The UNT Digital Library
Giant cross-magnetic-field steps due to binary collisions between pair particles
Article explores giant cross-magnetic-field steps which occur as a result of positron-electron collisions. Within a constant magnetic field (e.g., 1 T), a collision between a positron and an electron can result in a correlated drift across the magnetic field for a continuous range of impact parameters. Within this range, drift distances orders of magnitude larger than that associated with like-charge collisions were observed by computer simulation.
Date:
March 5, 2015
Creator:
Aguirre, F. F. & Ordonez, Carlos A.
Object Type:
Article
System:
The UNT Digital Library
Giant increase in cross-magnetic-field transport rate as an electron-positron plasma cools
The article focuses on a study of an electron-positron plasma in thermal equilibrium within a uniform magnetic field using a classical trajectory Monte Carlo simulation. The cross-magnetic-field single-particle diffusion coefficient is evaluated as a function of the magnetic field strength and plasma temperature. The transport rate is found to increase by many orders of magnitude as the plasma temperature is lowered, for a magnetic field strength of 1 T. The sharp dependence on temperature is due to electrons and positrons becoming temporarily correlated and drifting across the magnetic field before dissociating.
Date:
October 5, 2017
Creator:
Aguirre, F. F. & Ordonez, Carlos A.
Object Type:
Article
System:
The UNT Digital Library
Trade Primer: Qs and As on Trade Concepts, Performance, and Policy
The 112th Congress has a full legislative and oversight agenda on international trade. The agenda may include considering legislation to implement pending free trade agreements with Panama, South Korea, and Colombia, enhanced enforcement of U.S. trade agreements, as well as oversight of the World Trade Organization's Doha Round and trade relations with China. This report provides information and context for many of these topics. The report is divided into four sections in a question-and-answer format: trade concepts, U.S. trade performance, formulation of U.S. trade policy, and trade and investment issues.
Date:
January 5, 2011
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
The Colony Courier-Leader (The Colony, Tex.), Vol. 32, No. 49, Ed. 1 Sunday, January 5, 2014
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
January 5, 2014
Creator:
Aldaz, Gina
Object Type:
Newspaper
System:
The Portal to Texas History
The Colony Courier-Leader (The Colony, Tex.), Vol. 33, No. 34, Ed. 1 Sunday, October 5, 2014
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
October 5, 2014
Creator:
Aldaz, Gina
Object Type:
Newspaper
System:
The Portal to Texas History
MAP training: combining meditation and aerobic exercise reduces depression and rumination while enhancing synchronized brain activity
This article discusses the efficacy of mental and physical (MAP) training in improving symptoms of depression and rumination in individuals with major depressive disorder (MDD).
Date:
October 5, 2015
Creator:
Alderman, Brandon L.; Olson, Ryan L.; Brush, Christopher J. & Shors, Tracey J.
Object Type:
Article
System:
The UNT Digital Library
Brown bag on iConference - 2013
This presentation was created for a brown bag luncheon about the 2013 iConference. It includes discussion on participants, the venues, programs, the role of the UNT Libraries, and reflections on the event.
Date:
March 5, 2013
Creator:
Alemneh, Daniel Gelaw
Object Type:
Presentation
System:
The UNT Digital Library
Gene by Disease Interaction on Orbitofrontal Gray Matter in Cocaine Addiction
Chronic cocaine use has been associated with structural deficits in brain regions having dopamine receptive neurons. However, the concomitant use of other drugs and common genetic variability in monoamine regulation present additional structural variability. We therefore examined variations in gray matter volume (GMV) as a function of lifetime drug use and the monoamine oxidase A (MAOA) genotype in cocaine use disorders (CUD) and healthy controls.
Date:
December 5, 2010
Creator:
Alia-Klein, N.; Alia-Klein, N.; Parvaz, M. A.; Woicik, P. A.; Konova, A.; Maloney, T. et al.
Object Type:
Article
System:
The UNT Digital Library
The FERMI@Elettra free-electron-laser source for coherent X-ray physics: photon properties, beam transport system, and applications
FERMI@Elettra is comprised of two free electron lasers (FELs) that will generate short pulses (tau ~;; 25 to 200 fs) of highly coherent radiation in the XUV and soft X-ray region. The use of external laser seeding together with a harmonic upshift scheme to obtain short wavelengths will give FERMI@Elettra the capability to produce high quality, longitudinal coherent photon pulses. This capability together with the possibilities of temporal synchronization to external lasers and control of the output photon polarization will open new experimental opportunities not possible with currently available FELs. Here we report on the predicted radiation coherence properties and important configuration details of the photon beam transport system. We discuss the several experimental stations that will be available during initial operations in 2011, and we give a scientific perspective on possible experiments that can exploit the critical parameters of this new light source.
Date:
April 5, 2010
Creator:
Allaria, Enrico; Callegari, Carlo; Cocco, Daniele; Fawley, William M.; Kiskinova, Maya; Masciovecchio, Claudio et al.
Object Type:
Article
System:
The UNT Digital Library
Erosion-Resistant Nanocoatings for Improved Energy Efficiency in Gas Turbines
The objective of this Stage Gate IV project was to test and substantiate the viability of an erosion‐resistant nanocoating for application on compressor airfoils for gas turbines in both industrial power generation and commercial aviation applications. To effectively complete this project, the National Energy Technology Laboratory’s Office of Research & Development teamed with MDS Coating Technologies Inc. (MCT), Delta Air Lines ‐ Technical Operations Division (Delta Tech Ops), and Calpine Corporation. The coating targeted for this application was MCT’s Next Generation Coating, version 4 (NGC‐v4 ‐ with the new registered trademark name of BlackGold®). The coating is an erosion and corrosion resistant composite nanostructured coating. This coating is comprised of a proprietary ceramic‐metallic nano‐composite construction which provides enhanced erosion resistance and also retains the aerodynamic geometry of the airfoils. The objective of the commercial aviation portion of the project was to substantiate the coating properties to allow certification from the FAA to apply an erosion‐resistant coating in a commercial aviation engine. The goal of the series of tests was to demonstrate that the durability of the airfoils is not affected negatively with the application of the NGC v4 coating. Tests included erosion, corrosion, vibration and fatigue. The results of the …
Date:
February 5, 2014
Creator:
Alman, David & Marcio, Duffles
Object Type:
Report
System:
The UNT Digital Library
Mount Pleasant Tribune (Mount Pleasant, Tex.), Vol. 144, No. 45, Ed. 1 Saturday, May 5, 2018
Semiweekly newspaper from Mount Pleasant, Texas that includes local, state, and national news along with advertising.
Date:
May 5, 2018
Creator:
Alsobrook, Bruce
Object Type:
Newspaper
System:
The Portal to Texas History
Design of An 18 MW Beam Dump for 500 GeV Electron/Positron Beams at An ILC
This article presents a report on the progress made in designing 18 MW water based Beam Dumps for electrons or positrons for an International Linear Collider (ILC). Multi-dimensional technology issues have to be addressed for the successful design of the Beam Dump. They include calculations of power deposition by the high energy electron/positron beam bunch trains, computational fluid dynamic analysis of turbulent water flow, mechanical design, process flow analysis, hydrogen/oxygen recombiners, handling of radioactive 7Be and 3H, design of auxiliary equipment, provisions for accident scenarios, remote window exchanger, radiation shielding, etc. The progress made to date is summarized, the current status, and also the issues still to be addressed.
Date:
July 5, 2012
Creator:
Amann, John; /SLAC; Arnold, Ray; /SLAC; Seryi, Andrei; /SLAC et al.
Object Type:
Article
System:
The UNT Digital Library
Amarillo College Requests for Legislative Appropriations: 2018 and 2019
Report submitted by Amarillo College to the Texas 85th regular legislature requesting appropriations to fund programming and activities. It includes an overview of the institution's goals, summaries of appropriations requests for fiscal years 2018 and 2019, and supporting documentation.
Date:
August 5, 2016
Creator:
Amarillo College
Object Type:
Book
System:
The Portal to Texas History
The First Day of a New Congress: A Guide to Proceedings on the Senate Floor
The Senate follows a well-established routine on the opening day of a new Congress. The proceedings include swearing in new members, administrative business, and the election of the president pro tempore, the constitutionally mandated officer elected to preside over the chamber in the absence of the Vice President. This report contains information on what is contained in the well-established routine.
Date:
December 5, 2014
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library