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The Senate Select Committee on Ethics: A Brief History of Its Evolution and Jurisdiction
None
Date:
March 26, 2008
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Southwest Retort, Volume 60, Number 7, March 2008
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
March 2008
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Nuclear Engineering Enrollments and Degrees Survey, 2007 Data
The survey includes degrees granted between September 1, 2006, and August 1, 2007, and fall 2007 enrollments. Thirty-one academic programs reported having nuclear engineering programs during 2007, and data was obtained for all thirty-one.
Date:
March 1, 2008
Creator:
Analysis and Evaluation, Science Education Programs
Object Type:
Report
System:
The UNT Digital Library
Student Recital: 2008-03-28 - Jonathan Anderson, composer
Access:
Use of this item is restricted to the UNT Community
A student recital presented at the UNT College of Music Concert Hall.
Date:
March 28, 2008
Creator:
Anderson, Jonathan
Object Type:
Sound
System:
The UNT Digital Library
Survey of the ATLAS Pixel Detector Components
This document provides a description of the survey performed on different componentsof the ATLAS Pixel Detector at different stages of its assembly.
Date:
March 19, 2008
Creator:
Andreazza, Attilio; Kostyukhim, Vadim & Madaras, Ronald
Object Type:
Report
System:
The UNT Digital Library
Nuclear Fuel Reprocessing: U.S. Policy Development
This report discusses the reprocessing of nuclear fuel that refers to the chemical separation of fissionable uranium and plutonium from irradiated nuclear fuel.
Date:
March 27, 2008
Creator:
Andrews, Anthony
Object Type:
Report
System:
The UNT Digital Library
Fischer-Tropsch Fuels from Coal, Natural Gas, and Biomass: Background and Policy
This report provides background information and policy analysis regarding the ways to develop that directly and indirectly convert coal into liquid fuel.
Date:
March 27, 2008
Creator:
Andrews, Anthony & Logan, Jeffrey
Object Type:
Report
System:
The UNT Digital Library
Temperature dependence of the interface moments in Co2MnSi thin films
X-ray magnetic circular dichroism (XMCD) is utilized to explore the temperature dependence of the interface moments in Co{sub 2}MnSi (CMS) thin films capped with aluminium. By increasing the thickness of the capping layer we demonstrate enhanced interface sensitivity of the measurements and the existence of a thin Mn oxide layer at the CMS/Al interface even when a thick capping layer is used. We show that for well ordered L2{sub 1} CMS films there is no significant variation in either the Co or Mn interface moments as a function of temperature. However, a dramatic reduction in the interface moments at low temperature is observed in a disordered CMS film that is likely to be caused by increased Mn-Mn antiferromagnetic coupling. It is suggested that for ordered L2{sub 1} CMS films the temperature dependence of the tunneling magnetoresistance is not related to changes in the interface moments. However, the existence of residual Mn oxide at the CMS/barrier interface could be a contributing factor.
Date:
March 15, 2008
Creator:
Arenholz, Elke; Telling, N.; Keatley, P.; Shelford, L.; Arenholz, E.; van der Laan, G. et al.
Object Type:
Article
System:
The UNT Digital Library
X-ray absorption study of the electronic structure of Mn-doped amorphous Si
The electronic structure of Mn in amorphous Si (a-Mn{sub x}Si{sub 1?x}) is studied by X-ray absorption spectroscopy at the Mn L{sub 3,2} edges for x = 0.005-0.18. Except the x = 0.005 sample, which shows a slight signature of Mn{sup 2+} atomic multiplets associated with a local Mn moment, all samples have broad and featureless L{sub 3,2} absorption peaks, corresponding to an itinerant state for all 3d electrons. The broad X-ray absorption spectra exclude the possibility of a localized 3d moment and explain the unexpectedly quenched Mn moment in this magnetically-doped amorphous semiconductor. Such a fully delocalized d state of Mn dopant in Si has not been previously suggested.
Date:
March 8, 2008
Creator:
Arenholz, Elke; Zeng, Li; Huegel, A.; Helgren, E.; Hellman, F.; Piamonteze, C. et al.
Object Type:
Article
System:
The UNT Digital Library
Ferromagnetism and suppression of metallic clusters in Fe implanted ZnO -- a phenomenon related to defects?
We investigated ZnO(0001) single crystals annealed in high vacuum with respect to their magnetic properties and cluster formation tendency after implant-doping with Fe. While metallic Fe cluster formation is suppressed, no evidence for the relevance of the Fe magnetic moment to the observed ferromagnetism was found. The latter along with the cluster suppression is discussed with respect to defects in the ZnO host matrix, since the crystalline quality of the substrates was lowered due to the preparation as observed by x-ray diffraction.
Date:
March 12, 2008
Creator:
Arenholz, Elke; Zhou, S.; Potzger, K.; Talut, G.; Reuther, H.; Kuepper, K. et al.
Object Type:
Article
System:
The UNT Digital Library
Master's Recital: 2008-03-24 - Ian Argys, jazz guitar
Access:
Use of this item is restricted to the UNT Community
Recital presented at the UNT College of Music Kenton Hall in partial fulfillment of the Master of Music (MM) degree.
Date:
March 24, 2008
Creator:
Argys, Ian
Object Type:
Sound
System:
The UNT Digital Library
The Hutto Business Update (Hutto, Tex.), Vol. 4, No. 1, Ed. 1 Saturday, March 1, 2008
Newsletter focusing on information for and about the business community in Hutto, Texas, along with advertising.
Date:
March 1, 2008
Creator:
Arnett, Mahlon E., II
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
B, D and K Decays
The present report documents the results of Working Group 2: B, D and K decays, of the workshop on Flavor in the Era of the LHC, held at CERN from November 2005 through March 2007. With the advent of the LHC, we will be able to probe New Physics (NP) up to energy scales almost one order of magnitude larger than it has been possible with present accelerator facilities. While direct detection of new particles will be the main avenue to establish the presence of NP at the LHC, indirect searches will provide precious complementary information, since most probably it will not be possible to measure the full spectrum of new particles and their couplings through direct production. In particular, precision measurements and computations in the realm of flavor physics are expected to play a key role in constraining the unknown parameters of the Lagrangian of any NP model emerging from direct searches at the LHC. The aim of Working Group 2 was twofold: on one hand, to provide a coherent, up-to-date picture of the status of flavor physics before the start of the LHC; on the other hand, to initiate activities on the path towards integrating information on NP …
Date:
March 7, 2008
Creator:
Artuso, M.; Asner, D. M.; Ball, P.; Baracchini, E.; Bell, G.; Beneke, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Shillapoo Wildlife Area 2007 Follow-up HEP Report.
In April and May 2007 the Regional HEP Team (RHT) conducted a follow-up HEP analysis on the Egger (612 acres) and Herzog (210 acres) parcels located at the north end of the Shillapoo Wildlife Area. The Egger and Herzog parcels have been managed with Bonneville Power Administration funds since acquired in 1998 and 2001 respectively. Slightly more than 936 habitat units (936.47) or 1.14 HUs per acre was generated as an outcome of the 2007 follow-up HEP surveys. Results included 1.65 black-capped chickadee HUs, 280.57 great blue heron HUs, 581.45 Canada goose HUs, 40 mallard HUs, and 32.80 mink HUs. Introduction A follow-up Habitat Evaluation Procedures (HEP) (USFWS 1980) analysis was conducted by the Columbia Basin Fish and Wildlife Authority's (CBFWA) Regional HEP Team (RHT) during April and May 2007 to document changes in habitat quality and to determine the number of habitat units (HUs) to credit Bonneville Power Administration (BPA) for providing operation and maintenance (O&M) funds since WDFW acquired the parcels. The 2007 follow-up HEP evaluation was limited to Shillapoo Wildlife Area (SWA) parcels purchased with Bonneville Power Administration funds. D. Budd (pers. comm.) reported WDFW purchased the 612 acre Egger Farms parcel on November 2, 1998 for …
Date:
March 1, 2008
Creator:
Ashley, Paul R.
Object Type:
Report
System:
The UNT Digital Library
Search for CP Violation in Neutral D Meson Cabibbo-suppressedThree-body Decays
Using 385 fb{sup -1} of e{sup +}e{sup -} collision data collected at center-of-mass energies around 10.6 GeV, we search for time-integrated CP violation in the Cabibbo-suppressed decays D{sup 0}/{bar D}{sup 0} {yields} {pi}{sup -}{pi}{sup +}{pi}{sup 0} and D{sup 0}/{bar D}{sup 0} {yields} K{sup -}K{sup +}{pi}{sup 0} with both model-independent and model-dependent methods. Measurements of the asymmetries in amplitudes of flavor states and CP eigenstates provide constraints on theories beyond the Standard Model, some of which predict CP violation in amplitudes at the 1% level or higher. We find no evidence of CP violation and hence no conflict with the Standard Model.
Date:
March 11, 2008
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Measurement of the tau- to eta pi-pi+pi-nu tau Branching Fraction and a Search for a Second-Class Current in the tau- to eta'(958)pi-nu tau Decay
The {tau}{sup -} {yields} {eta}{pi}{sup -}{pi}{sup +}{pi}{sup -}{nu}{sub {tau}} decay with the {eta} {yields} {gamma}{gamma} mode is studied using 384 fb{sup -1} of data collected by the BABAR detector. The branching fraction is measured to be (1.60 {+-} 0.05 {+-} 0.11) x 10{sup -4}. It is found that {tau}{sup -} {yields} f{sub 1}(1285){pi}{sup -} {nu}{sub {tau}} {yields} {eta}{pi}{sup -}{pi}{sup +}{pi}{sup -}{nu}{sub {tau}} is the dominant decay mode with a branching fraction of (1.11 {+-} 0.06 {+-} 0.05) x 10{sup -4}. The first error on the branching fractions is statistical and the second systematic. In addition, a 90% confidence level upper limit on the branching fraction of the {tau}{sup -} {yields} {eta}{prime}(958){pi}{sup -}{nu}{sub {tau}} decay is measured to be 7.2 x 10{sup -6}. This last decay proceeds through a second-class current and is expected to be forbidden in the limit of isospin symmetry.
Date:
March 24, 2008
Creator:
Aubert, B.; Bona, M.; Boutigny, D.; Karyotakis, Y.; Lees, J. P.; Poireau, V. et al.
Object Type:
Article
System:
The UNT Digital Library
Measurement of the Spin of the $\Xi(1530)$ Resonance
The properties of the {Xi}(1530) resonance are investigated in the {Lambda}{sub c}{sup +} {yields} {Xi}{sup -}{pi}{sup +}K{sup +} decay process. The data sample was collected with the BABAR detector at the SLAC PEP-II asymmetric-energy e{sup +}e{sup -} collider operating at center of mass energies 10.58 and 10.54 GeV. The corresponding integrated luminosity is approximately 230 fb{sup -1}. The spin of the {Xi}(1530) is established to be 3/2. The existence of an S-wave amplitude in the {Xi}{sup -}{pi}{sup +} system is inferred, and its interference with the {Xi}(1530)0 amplitude provides the first clear demonstration of the Breit-Wigner phase motion expected for the {Xi}(1530). The P{sub 1}(cos {theta}{sub {Xi}{sup -}}) Legendre polynomial moment indicates the presence of a significant S-wave amplitude for {Xi}{sup -}{pi}{sup +} mass values above 1.6 GeV/c{sup 2}, and a dip in the mass distribution at approximately 1.7 GeV/c{sup 2} is interpreted as due to coherent addition of a {Xi}(1690){sup 0} contribution to this amplitude. This would imply J{sup P} = 1/2{sup -} for the {Xi}(1690). Attempts at fitting the {Xi}(1530){sup 0} lineshape yield unsatisfactory results, and this failure is attributed to interference effects associated with the amplitudes describing the K{sup +}{pi}{sup +} and/or {Xi}{sup -}K{sup +} systems.
Date:
March 25, 2008
Creator:
Aubert, B.; Bona, M.; Karyotakis, Y.; Lees, J. P.; Poireau, V.; Prudent, X. et al.
Object Type:
Article
System:
The UNT Digital Library
The Budget for Fiscal Year 2009
This report consists of the budget for fiscal year 2009.
Date:
March 19, 2008
Creator:
Austin, D. Andrew
Object Type:
Report
System:
The UNT Digital Library
Using Perturbed QR Factorizations To Solve Linear Least-Squares Problems
We propose and analyze a new tool to help solve sparse linear least-squares problems min{sub x} {parallel}Ax-b{parallel}{sub 2}. Our method is based on a sparse QR factorization of a low-rank perturbation {cflx A} of A. More precisely, we show that the R factor of {cflx A} is an effective preconditioner for the least-squares problem min{sub x} {parallel}Ax-b{parallel}{sub 2}, when solved using LSQR. We propose applications for the new technique. When A is rank deficient we can add rows to ensure that the preconditioner is well-conditioned without column pivoting. When A is sparse except for a few dense rows we can drop these dense rows from A to obtain {cflx A}. Another application is solving an updated or downdated problem. If R is a good preconditioner for the original problem A, it is a good preconditioner for the updated/downdated problem {cflx A}. We can also solve what-if scenarios, where we want to find the solution if a column of the original matrix is changed/removed. We present a spectral theory that analyzes the generalized spectrum of the pencil (A*A,R*R) and analyze the applications.
Date:
March 21, 2008
Creator:
Avron, Haim; Ng, Esmond G. & Toledo, Sivan
Object Type:
Article
System:
The UNT Digital Library
POTENTIAL FOR HYDROGEN BUILDUP IN HANFORD SEALED AIR FILLED NUCLEAR STORAGE VESSELS
None
Date:
March 11, 2008
Creator:
BE, HEY
Object Type:
Report
System:
The UNT Digital Library
Environmental Tests of the Flight GLAST LAT Tracker Towers
The Gamma-ray Large Area Space telescope (GLAST) is a gamma-ray satellite scheduled for launch in 2008. Before the assembly of the Tracker subsystem of the Large Area Telescope (LAT) science instrument of GLAST, every component (tray) and module (tower) has been subjected to extensive ground testing required to ensure successful launch and on-orbit operation. This paper describes the sequence and results of the environmental tests performed on an engineering model and all the flight hardware of the GLAST LAT Tracker. Environmental tests include vibration testing, thermal cycles and thermal-vacuum cycles of every tray and tower as well as the verification of their electrical performance.
Date:
March 12, 2008
Creator:
Bagagli, R.; Baldini, L.; Bellazzini, R.; Barbiellini, G.; Belli, F.; Borden, T. et al.
Object Type:
Article
System:
The UNT Digital Library
Work Function Changes Induced by Charged Adsorbates: Origin of the Polarity Asymmetry
Article discussing work function changes induced by charged adsorbates and the origin of the polarity asymmetry.
Date:
March 28, 2008
Creator:
Bagus, Paul S.; Käfer, Daniel; Witte, Gregor & Wöll, Christof
Object Type:
Article
System:
The UNT Digital Library
Oklahoma Firefighter (Oklahoma City, Okla.), Vol. 25, No. 2, Ed. 1 Saturday, March 1, 2008
Monthly periodical from Oklahoma City, Oklahoma published by and for members of the Oklahoma State Firefighters Association that includes news and information along with advertising.
Date:
March 1, 2008
Creator:
Bain, Chris
Object Type:
Journal/Magazine/Newsletter
System:
The Gateway to Oklahoma History
Faculty Recital: 2008-03-27 - Tony Baker, trombone
Access:
Use of this item is restricted to the UNT Community
Recital performed at the UNT College of Music Concert Hall.
Date:
March 27, 2008
Creator:
Baker, Tony (Trombonist) & van Schalkwyk, Willem
Object Type:
Sound
System:
The UNT Digital Library