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An Improved Direct Measurement of Leptonic Coupling Asymmetries with Polarized Z{sup 0}'s
We report new direct measurements of the Z{sup 0}-lepton coupling asymmetry parameters A{sub e}, A{sub {mu}} and A{sub r}, with polarized Z{sup 0}'s collected by the SLD detector at the SLAC Linear Collider. The parameters are extracted from the measurement of the left-right-forward-backward asymmetries for each lepton species. The 1996, 1997 and 1998 SLD runs are included in this analysis and combined with published data from the 1993-95 runs. Preliminary results are A{sub e} = 0.1558 {+-} 0.0064, A{sub {mu}} = 0.137 {+-} 0.016 and A{sub {tau}} = 0.142 {+-} 0.016. If lepton universality is assumed, a combined asymmetry parameter A{sub l} = 0.1523 {+-} 0.0057 results. This translates into an effective weak mixing angle sin{sup 2} {theta}{sub W}{sup eff} = 0.23085 {+-} 0.00073 at the Z{sup 0} resonance.
Date:
August 3, 1999
Creator:
Abe, Toshinori
Object Type:
Report
System:
The UNT Digital Library
Analysis of compression behavior of a [011] Ta single crystal with orientation imaging microscopy and crystal plasticity
High-purity tantalum single crystal cylinders oriented with [011] parallel to the cylinder axis were deformed 10, 20, and 30 percent in compression. The engineering stress-strain curve exhibited an up-turn at strains greater than {approximately}20% while the samples took on an ellipsoidal shape during testing, elongated along the [100] direction with almost no dimensional change along [0{bar 1}1]. Two orthogonal planes were selected for characterization using Orientation Imaging Microscopy (OIM): one plane containing [100] and [011] (longitudinal) and the other in the plane containing [0{bar 1}1] and [011] (transverse). OIM revealed patterns of alternating crystal rotations that develop as a function of strain and exhibit evolving length scales. The spacing and magnitude of these alternating misorientations increases in number density and decreases in spacing with increasing strain. Classical crystal plasticity calculations were performed to simulate the effects of compression deformation with and without the presence of friction. The calculated stress-strain response, local lattice reorientations, and specimen shape are compared with experiment.
Date:
February 3, 1999
Creator:
Adams, B. L.; Campbell, G. H.; King, W. E.; Lassila, D. H.; Stolken, J. S.; Sun, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Comparison of the total cross sections measurements of CDF and E811
The total cross section at {radical}s = 1.8 TeV has been measured by three groups (CDF, E710, and E811). We think that CDF should quote results based only on our own measurement. We also indicate how to compare cross sections measured by both CDF and D0.
Date:
March 3, 1999
Creator:
Albrow, M.; Beretvas, A.; Nodulman, L. & Giromini, P.
Object Type:
Report
System:
The UNT Digital Library
ISCR annual report FY 1998
Advances in scientific computing research have never been more vital to the core missions of Lawrence Livermore National Laboratory than they are today. These advances are evolving so rapidly, and over such a broad front of computational science, that to remain on the leading edge, the Laboratory must collaborate with many academic centers of excellence. In FY 1998, ISCR dramatically expanded its interactions with academia through collaborations, visiting faculty, guests and a seminar series. The pages of this annual report summarize the activities of the 63 faculty members and 34 students who participated in ISCR collaborative activities during FY 1998. The 1998 ISCR call for proposals issued by the University Collaborative Research Program (UCRP) resulted in eight awards made by the University of California Office of the President to research teams at UC San Diego, UC Davis, UC Los Angeles, and UC Berkeley. These projects are noted. ISCR is now part of the Laboratory�s Center for Applied Scientific Computing (CASC). Many CASC scientists participate actively in ISCR�University collaborations, as noted. The eight collaborations shown represent innovative research efforts supported by ISCR in FY 1998. Abstracts discussing each of these collaborations begin on page 79. The Accelerated Strategic Computing Initiative (ASCI) …
Date:
May 3, 1999
Creator:
Alchorn, A & Fitzgerald, J M
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Leslie W. Bray, Jr., March 3, 1999
Access:
Use of this item is restricted to the UNT Community
Interview with Army Air Forces veteran Leslie W. Bray, Jr. The interview includes Bray's personal experiences about the China-Burma-India Theater during World War II, youth during the Great Depression, flight training, being designated as the commander of the 16th Combat Cargo Squadron, stationing at Sylhet, India as part of his assignment to the CBI Theater, supplying the British 14th Army in Burma, flying difficulties due to weather conditions, various transfers, and flying "The Hump." Bray also talks about his early aspirations to become an aviator, initial failures to pass the Air Forces physical examination, his assignment to Troop Carrier Command, flying C-47s with the 1st Troop Carrier Group, his appointment as assistant group operations officer for the 10th Troop Carrier Group, Air Force School of Applied Tactics, the training of replacement units at various Air Force installations, the deactivation of the 16th Combat Cargo Squadron, and his postwar Air Force career and retirement as a general officer.
Date:
March 3, 1999
Creator:
Alexander, William J. & Bray, Leslie W., Jr.
Object Type:
Book
System:
The UNT Digital Library
Oral History Interview with Rudy Kiehne, March 3, 1999
Access:
Use of this item is restricted to the UNT Community
Interview with Rudy Kiehne, a Navy veteran, concerning his experiences while aboard the battleship USS Maryland during the Japanese attack at Pearl Harbor on December 7, 1941.
Date:
March 3, 1999
Creator:
Alexander, William J. & Kiehne, Rudy, 1919-
Object Type:
Book
System:
The UNT Digital Library
Oral History Interview with Roy D. Much, February 3, 1999
Access:
Use of this item is restricted to the UNT Community
Transcript of an interview with Roy D. Much, Army veteran (987th Field Artillery Battalion), concerning his experiences in the European Theater during World War II. Much discusses his pre-war education and employment; basic training in the artillery, Camp Bowie, Brownwood, Texas, 1942; and general comments about his experiences at Normandy, Saint-Lô, liberation of Paris, Huertgen Forest, Remagen Bridge, Battle of the Bulge, and the liberation of Czechoslovakia.
Date:
February 3, 1999
Creator:
Alexander, William J. & Much, Roy D.
Object Type:
Book
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 97, Ed. 1 Wednesday, February 3, 1999
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 3, 1999
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 117, Ed. 1 Wednesday, March 3, 1999
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
March 3, 1999
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Tanks Focus Area (TFA) Site Needs Assessment FY 1999
This report documents the process used by the Tanks Focus Area (TFA) to analyze and develop responses to technology needs submitted by five major U.S. Department of Energy (DOE) sites with radioactive tank waste problems, and the initial results of the analysis. The sites are the Hanford Site, Idaho National Engineering and Environmental Laboratory (INEEL), Oak Ridge Reservation (ORR), Savannah River Site (SRS), and West Valley Demonstration Project (WVDP). This is the fifth edition of the TFA site needs assessment. As with previous editions, this edition serves to provide the basis for accurately defining the TFA program for the upcoming fiscal year (FY), and adds definition to the program for up to 4 additional outyears. Therefore, this version distinctly defines the FY 2000 progrti and adds further definition to the FY 2001- FY 2004 program. Each year, the TFA reviews and amends its program in response to site users' science and technology needs.
Date:
May 3, 1999
Creator:
Allen, RW
Object Type:
Report
System:
The UNT Digital Library
Increased Oil Production and Reserves Utilizing Secondary/Tertiary Recovery Techniques on Small Reservoirs in the Paradox Basin, Utah
The primary objective of this project is to enhance domestic petroleum production by demonstration and technology transfer of an advanced oil recovery technology in the Paradox basin, southeastern Utah. If this project can demonstrate technical and economic feasibility, the technique can be applied to about 100 additional small fields in the Paradox basin alone, and result in increased recovery of 150 to 200 million bbl of oil. This project is designed to characterize five shallow-shelf carbonate reservoirs in the Pennsylvanian (Desmoinesian) Paradox Formation and choose the best candidate for a pilot demonstration project for either a waterflood or carbon dioxide-(CO-) flood 2 project. The field demonstration, monitoring of field performance, and associated validation activities will take place in the Paradox basin within the Navajo Nation. The results of this project will be transferred to industry and other researchers through a petroleum extension service, creation of digital databases for distribution, technical workshops and seminars, field trips, technical presentations at national and regional professional meetings, and publication in newsletters and various technical or trade journals.
Date:
November 3, 1999
Creator:
Allison, M. Lee & Chidsey, Thomas, Jr.
Object Type:
Report
System:
The UNT Digital Library
Inelastic scattering of synchrotron radiation from electrons and nuclei for lattice dynamics studies.
The inelastic scattering of x-rays, one of the first applications of x-rays to the field of condensed matter physics, has been rejuvenated in the last decade. The availability of synchrotrons radiation from wiggler and undulator sources combined with advances in monochromatization of the incident beam and analysis of the scattered beam with meV resolution led to the measurement of phonon dispersion relations. In addition, the use of Moessbauer nuclei as scatterer and analyzers has led to the discovery of the inelastic nuclear resonant scattering technique. This new method allows extraction of partial phonon density of states from amorphous materials, thin films, multilayers and interfaces, and liquids.
Date:
December 3, 1999
Creator:
Alp, E. E.; Sturhahn, W.; Sinn, H.; Toellner, T.; Hu, M.; Sutter, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Light and heavy element isotopic compositions of mainstream SiC grains.
Although a variety of types of pre-solar SiC grains have been classified by their C, N, and Si isotopic composition, the majority of such grains are so-called mainstream grains and are believed to have come from asymptotic giant branch stars [1]. We have previously reported the Mo isotopic compositions of presolar SiC grains whose C, N, and Si isotopic compositions were not known [2]. Since most presolar SiC grains fall in the mainstream group, we assumed that these grains were mainstream. The excellent match of the Mo isotopic data with expectations for nucleosynthesis in AGB stars was consistent with this identification. In order to better understand the distribution of isotopic compositions in presolar grains, we have begun to measure heavy element isotopic compositions of presolar SiC grains of known C, N and Si isotopic composition.
Date:
February 3, 1999
Creator:
Amari, S.; Clayton, R. N.; Davis, A. M.; Lewis, R. S. & Pellin, M. J.
Object Type:
Article
System:
The UNT Digital Library
Molybdenum isotopic composition of single silicon carbides from supernovae.
Presolar silicon carbide grains form in a variety of types of stars, including asymptotic giant branch red giant stars and supernovae. The dominant mechanisms of heavy element nucleosynthesis, the s-process and r-process, are thought to occur in AGB stars and supernovae, respectively. We have previously reported that mainstream SiC grains have strong enrichments in the s-process isotopes of Sr, Zr and Mo. We report here the first measurements of Mo isotopes in X-type SiC grains, which have previously been identified as having formed from supernova ejecta.
Date:
February 3, 1999
Creator:
Amari, S.; Clayton, R. N.; Davis, A. M.; Lewis, R. S. & Pellin, M. J.
Object Type:
Article
System:
The UNT Digital Library
Chemical and Physical Changes in a Hydrolyzed Poly(ester urethane)
Hydrolytic degradation has been shown to be a significant problem for poly(ester urethane) elastomers exposed to high humidity environments. The ester group in the soft segment is particularly susceptible to hydrolysis. One of the products of this reaction is a carboxylic acid group that catalyses further hydrolysis. The resulting reduction in molecular weight leads to deterioration of the elastomer's mechanical properties. In this paper we have measured the extent of the hydrolysis reaction by {sup 13}C NMR spectroscopy. In addition we have measured the spin-spin relaxation time of the soft phase and followed the increase in mobility of these segments. Both measurements were performed on the solid polymer. These measurements provide an excellent monitoring tool of the chemical and physical state of polymer during the aging process.
Date:
November 3, 1999
Creator:
Assink, Roger A.; Celina, Mathias C. & Lang, David P.
Object Type:
Article
System:
The UNT Digital Library
Atmospheric Radiation Measurement Program Facilities Newsletter, August 1999.
Monthly newsletter discussing news and activities related to the Atmospheric Radiation Measurement Program, articles about weather and atmospheric phenomena, and other related topics.
Date:
September 3, 1999
Creator:
Atmospheric Radiation Measurement Program (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
A Posteriori Error Estimation for a Nodal Method in Neutron Transport Calculations
An a posteriori error analysis of the spatial approximation is developed for the one-dimensional Arbitrarily High Order Transport-Nodal method. The error estimator preserves the order of convergence of the method when the mesh size tends to zero with respect to the L{sup 2} norm. It is based on the difference between two discrete solutions that are available from the analysis. The proposed estimator is decomposed into error indicators to allow the quantification of local errors. Some test problems with isotropic scattering are solved to compare the behavior of the true error to that of the estimated error.
Date:
November 3, 1999
Creator:
Azmy, Y.Y.; Buscaglia, G.C. & Zamonsky, O.M.
Object Type:
Article
System:
The UNT Digital Library
Permeability of WIPP Salt During Damage Evolution and Healing
The presence of damage in the form of microcracks can increase the permeability of salt. In this paper, an analytical formulation of the permeability of damaged rock salt is presented for both initially intact and porous conditions. The analysis shows that permeability is related to the connected (i.e., gas accessible) volumetric strain and porosity according to two different power-laws, which may be summed to give the overall behavior of a porous salt with damage. This relationship was incorporated into a constitutive model, known as the Multimechanism Deformation Coupled Fracture (MDCF) model, which has been formulated to describe the inelastic flow behavior of rock salt due to coupled creep, damage, and healing. The extended model was used to calculate the permeability of rock salt from the Waste Isolation Pilot Plant (WIPP) site under conditions where damage evolved with stress over a time period. Permeability changes resulting from both damage development under deviatoric stresses and damage healing under hydrostatic pressures were considered. The calculated results were compared against experimental data from the literature, which indicated that permeability in damaged intact WIPP salt depends on the magnitude of the gas accessible volumetric strain and not on the total volumetric strain. Consequently, the permeability …
Date:
December 3, 1999
Creator:
BODNER,SOL R.; CHAN,KWAI S. & MUNSON,DARRELL E.
Object Type:
Article
System:
The UNT Digital Library
Technical Basis for Implementation of the PCM-1B for Personnel Release at Tank Farms
The purpose of this document is to define the technical basis and implementing guidelines for using automated personnel contamination monitors, such as the PCM-1B, at the River Protection Project (RPP) in lieu of performing a hand-held instrument followed by a PCM-1B survey for personnel release from contamination areas requiring a beta-gamma whole body survey. This document provides the basis for full implementation of the PCM-1B release survey, without the supplemental hand and foot survey, as currently implemented at RPP. This document applies only to RPP facilities. This document does not provide the technical basis for determining the equivalency of an automated system to hand-held instruments, or to the effective counting capability of automated systems as such technical determinations are contained in TBTN: GDGH-9604-RLS-0015.
Date:
December 3, 1999
Creator:
BROWN, R.L.
Object Type:
Report
System:
The UNT Digital Library
InGaAsN/AlGaAs Pnp Heterojunction Bipolar Transistor
The authors have demonstrated a functional Pnp heterojunction bipolar transistor (HBT) using InGaAsN. The metalorganic vapor phase epitaxy (MOCVD) grown Al{sub 0.3}Ga{sub 0.7}As/In{sub 0.03}Ga{sub 0.97}As{sub 0.99}N{sub 0.01} HBT takes advantage of the narrower bandgap energy (E{sub g} = 1.25eV) of In{sub 0.03}Ga{sub 0.97}As{sub 0.99}N{sub 0.01}, which is lattice matched to GaAs. Compared with the Al{sub 0.3}Ga{sub 0.7}As/GaAs material system, the Al{sub 0.3}Ga{sub 0.7}As/In{sub 0.03}Ga{sub 0.97}As{sub 0.99}N{sub 0.01} material system has a larger conduction band offset, while the valence band offset remains comparable. This characteristic band alignment is very suitable for Pnp HBT applications. The device's peak current gain is 23 and it has a turn on voltage of 0.77V, which is 0.25V lower than in a comparable Pnp Al{sub 0.3}Ga{sub 0.7}As/GaAs HBT.
Date:
November 3, 1999
Creator:
Baca, Albert G.; Chang, Ping-Chih; Hou, H. Q.; Laroche, J. R.; Li, N. Y.; Ren, F. et al.
Object Type:
Article
System:
The UNT Digital Library
Heating of nuclear matter and multifragmentation : antiprotons vs. pions.
Heating of nuclear matter with 8 GeV/c {bar p} and {pi}{sup {minus}} beams has been investigated in an experiment conducted at BNL AGS accelerator. All charged particles from protons to Z {approx_equal} 16 were detected using the Indiana Silicon Sphere 4{pi} array. Significant enhancement of energy deposition in high multiplicity events is observed for antiprotons compared to other hadron beams. The experimental trends are qualitatively consistent with predictions from an intranuclear cascade code.
Date:
May 3, 1999
Creator:
Back, B.; Beaulieu, L.; Breuer, H.; Gushue, S.; Hsi, W.-C.; Korteling, R. G. et al.
Object Type:
Article
System:
The UNT Digital Library
Heating {sup 197}Au nuclei with 8 GeV antiproton and {pi}- beams.
This contribution stresses results recently obtained from experiment E900 performed at the Brookhaven AGS accelerator with 8 GeV/c antiproton and negative pion beams using the Indiana Silicon Sphere detector array. An investigation of the reaction mechanism is presented, along with source characteristics deduced from a two-component fit to the spectra. An enhancement of deposition energy with the antiproton beam with respect to the pion beam is observed. The results are qualitatively consistent with predictions of an intranuclear cascade code.
Date:
May 3, 1999
Creator:
Back, B.; Beaulieu, L.; Breuer, H.; Gushue, S.; Hsi, W.-C.; Korteling, R. G. et al.
Object Type:
Article
System:
The UNT Digital Library
Isolating the thermal degree of freedom in nuclear multifragmentation.
Multifragmentation studies induced by GeV light-ion beams permit investigation of the influence of intrinsic thermal properties of hot nuclear matter, with minimal interference from the compression/decompression cycle and rotational instabilities. We summarize recent results obtained with {sup 3}He, proton and pion beams up to 15 GeV/c and present the initial results from a recent experiment with 8 GeV/c antiproton and pion beams. The results are compared with INC simulations coupled to EES and SMM models and the caloric curve for the {sup 3}He data will also be discussed.
Date:
May 3, 1999
Creator:
Back, B.; Beaulieu, L.; Breuer, H.; Gushue, S.; Hsi, W.-C.; Korteling, R. G. et al.
Object Type:
Article
System:
The UNT Digital Library
Voltage controlled spintronics device for logic applications.
We consider logic device concepts based on our previously proposed spintronics device element whose magnetization orientation is controlled by application of a bias voltage instead of a magnetic field. The basic building block is the voltage-controlled rotation (VCR) element that consists of a four-layer structure--two ferromagnetic layers separated by both nanometer-thick insulator and metallic spacer layers. The interlayer exchange coupling between the two ferromagnetic layers oscillates as a function of applied voltage. We illustrate transistor-like concepts and re-programmable logic gates based on VCR elements.
Date:
September 3, 1999
Creator:
Bader, S. D. & You, C.-Y.
Object Type:
Article
System:
The UNT Digital Library