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Study of Heavy-Flavored Particles
This report discusses the following topics: continuum production and decay of {Lambda}{sub c}{sup +} charmed baryon; search for new decay modes and new charmed baryons; baryons from B meson decay; measurement of {bar B}{sup 0} {yields} D*{sup +}{pi}{sup {minus}} branching ratio; determination of {alpha}{sub s}; software implementation for CLEO II physics; the measurement of the magnetic moments of baryons at the Tevatron; research and development toward a 50 picosecond TOF system; time-flight-of device Monte Carlo; continuum production of {Lambda}{sub c}{sup +}, {Sigma}{sub c}{sup +}, new and old decay modes; {Xi}{sub c}{sup 0} and {Xi} {sub c}{sup +} production; search for B {yields} {Xi}{sub c} X; search for excited states {Xi}*{sub c}{sup 0}, {Xi}*{sub c}{sup +}, {Xi} {sub c}{sup 0}{prime}, and {Xi}{sub c}{sup +}{prime}; search for {Omega}{sub c}{sup 0}; B decays to baryons X; exclusive B {yields} {Lambda}{sub c}{sup +}{bar p}(n{pi}) states; B reconstruction and studies with tagged sample; determination of {alpha}{sub s} future work; and software implementation for CLEO II data analysis.
Date:
January 1, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
WIPP waste characterization program sampling and analysis guidance manual
The Waste Isolation Pilot Plant (WIPP) Waste Characterization Program Sampling and Analysis Guidance Manual (Guidance Manual) provides a unified source of information on the sampling and analytical techniques that enable Department of Energy (DOE) facilities to comply with the requirements established in the current revision of the Quality Assurance Program Plan (QAPP) for the WIPP Experimental-Waste Characterization Program (the Program). This Guidance Manual includes all of the sampling and testing methodologies accepted by the WIPP Project Office (DOE/WPO) for use in implementing the Program requirements specified in the QAPP. This includes methods for characterizing representative samples of transuranic (TRU) wastes at DOE generator sites with respect to the gas generation controlling variables defined in the WIPP bin-scale and alcove test plans, as well as waste container headspace gas sampling and analytical procedures to support waste characterization requirements under the WIPP test program and the Resource Conservation and Recovery Act (RCRA). The procedures in this Guidance Manual are comprehensive and detailed and are designed to provide the necessary guidance for the preparation of site specific procedures. The use of these procedures is intended to provide the necessary sensitivity, specificity, precision, and comparability of analyses and test results. The solutions to achieving …
Date:
January 1, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Particle deposition in human and canine tracheobronchial casts
The aim of this work is to measure deposition patterns and efficiencies of aerosol particles within realistic, single-pathway physical models of the tracheobronchial airways of humans and experimental animals over a range of particle sizes for a variety of respiratory modes and rates. This will provide data needed to assess the dose to the bronchial epithelium from inhaled radon progeny. In the current year theoretical studies based on a developing flow model were extended. We concluded that although the developing flow model is better predictor of the data than assumption of parabolic flow, the predicated deposition is significantly lower than that predicted by our best fit equation. The mass size dispersion of particles classified according to their electrical mobilities was also studies. For the conditions tested, doubly charged particles constituted 9--13% of the total particle number concentration and 24--48% of the total mass concentration. We demonstrated that the multiply charged particles are effectively removed, and nearly monodisperse particles produced, if an impactor is placed in the aerosol generation system. A condensation aerosol generator was constructed and tested for the production of high concentrations of radioactively tagged aerosol particles with diameters from 0.2 to 10{mu}m. 9 refs.
Date:
January 15, 1991
Creator:
Cohen, B.S.
Object Type:
Report
System:
The UNT Digital Library
Development of a new plasma diagnostic of the critical surface and studies of the ion acoustic decay instability using collective Thomson scattering. Final report
We have developed 5-channel collective Thomson scattering system to measure the ion acoustic wave excited by the ion acoustic wave decay instabilities. The multichannel collective Thomson scattering technique was established with 4{omega} probe laser beam using GDL laser system at LLE, Univ. of Rochester. We have obtained the ionic charge state Z by measuring the second harmonic emission from the ion acoustic decay instability. The LASNEX computer simulation calculations have been carried out. The experimental results agree very well with the LASNEX computer simulation results with the flux number f=0.1. In high power laser regime, the spectrum become broad, and the {alpha}{gamma} decreases indicating that the turbulent like spectrum is observed. In order to understand the experimental results, we have developed a theory to study absorption of laser and heat transport. This new theory includes the temporal evolution of the heat conduction region. The results agree with flux-limited hydrodynamic simulations. 20 refs.
Date:
December 31, 1991
Creator:
Mizuno, K.; DeGroot, J. S. & Seka, W.
Object Type:
Report
System:
The UNT Digital Library
Development of a New Plasma Diagnostic of the Critical Surface and Studies of the Ion Acoustic Decay Instability Using Collective Thomson Scattering
We have developed 5-channel collective Thomson scattering system to measure the ion acoustic wave excited by the ion acoustic wave decay instabilities. The multichannel collective Thomson scattering technique was established with 4{omega} probe laser beam using GDL laser system at LLE, Univ. of Rochester. We have obtained the ionic charge state Z by measuring the second harmonic emission from the ion acoustic decay instability. The LASNEX computer simulation calculations have been carried out. The experimental results agree very well with the LASNEX computer simulation results with the flux number f=0.1. In high power laser regime, the spectrum become broad, and the {alpha}{gamma} decreases indicating that the turbulent like spectrum is observed. In order to understand the experimental results, we have developed a theory to study absorption of laser and heat transport. This new theory includes the temporal evolution of the heat conduction region. The results agree with flux-limited hydrodynamic simulations. 20 refs.
Date:
January 1, 1991
Creator:
Mizuno, K.; DeGroot, J. S. & Seka, W.
Object Type:
Report
System:
The UNT Digital Library
Tunneling in Cuprate and Bismuthate Superconductors
Tunneling measurements using a point-contact technique are reported for the following high temperature superconducting oxides: Ba{sub 1-x}K{sub x}BiO{sub 3}( BKBO ), Nd{sub 2-x}Ce{sub x}CuO{sub 4}( NCCO ), Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 7}( BSCCO ) and Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub x} ( TBCCO ). For the bismuthate, BKBO, ideal, S-I-N tunneling characteristics are observed using a Au tip. The normalized conductance is fitted to a BCS density of states and thermal smearing only proving there is no fundamental limitation in BKBO for device applications. For the cuprates, the normalized conductance displays BCS-like characteristics, but with a broadening larger than from thermal smearing. Energy gap values are presented for each material. For BKBO and NCCO the Eliashberg functions, {alpha}{sup 2}F({omega}), obtained from the tunneling are shown to be in good agreement with neutron scattering results. Proximity effect tunneling studies are reported for Au/BSCCO bilayers and show that the energy gap of BSCCO can be observed through Au layers up to 600 {Angstrom} thick.
Date:
October 1, 1991
Creator:
Zasadzinski, J. F.; Huang, Qiang; Tralshawala, N. & Gray, K. E.
Object Type:
Article
System:
The UNT Digital Library
Tunneling in cuprate and bismuthate superconductors
Tunneling measurements using a point-contact technique are reported for the following high temperature superconducting oxides: Ba{sub 1-x}K{sub x}BiO{sub 3}(BKBO), Nd{sub 2-x}Ce{sub x}CuO{sub 4}(NCCO), Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 7}(BSCCO) and Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub x} (TBCCO). For the bismuthate, BKBO, ideal, S-I-N tunneling characteristics are observed using a Au tip. The normalized conductance is fitted to a BCS density of states and thermal smearing only proving there is no fundamental limitation in BKBO for device applications. For the cuprates, the normalized conductance displays BCS-like characteristics, but with a broadening larger than from thermal smearing. Energy gap values are presented for each material. For BKBO and NCCO the Eliashberg functions, {alpha}{sup 2}F({omega}), obtained from the tunneling are shown to be in good agreement with neutron scattering results. Proximity effect tunneling studies are reported for Au/BSCCO bilayers and show that the energy gap of BSCCO can be observed through Au layers up to 600 {Angstrom} thick.
Date:
October 1, 1991
Creator:
Zasadzinski, J. F.; Huang, Qiang; Tralshawala, N. & Gray, K. E.
Object Type:
Article
System:
The UNT Digital Library
Design and performance of the traveling-wave beam chopper for the SSRL injector
A pulsed, split-parallel plate chopper has been designed built, and installed as part of the preinjector of the SSRL Injector. Its function is to allow the linear accelerator three consecutive S-band bunches from the long bunch train provided by a RF gun. A permanent magnet deflector (PMD) at the chopper entrance deflects the beam into an absorber when the chopper pulse is off. The beam is swept across a pair of slits at the beam output end when a 7 kV, 10-ns rise-time pulse passes in the opposite direction through the 75 {Omega} stripline formed by the deflecting plates. Bunches exiting the slits have their trajectories corrected by another PMD, and enter the linac. Beam tests demonstrate that the chopper functions as expected. 9 refs., 5 figs.
Date:
May 1, 1991
Creator:
Borland, M.; Weaver, J. N.; Baltay, M.; Emery, L.; Fisher, A. S.; Golceff, P. et al.
Object Type:
Article
System:
The UNT Digital Library
Studies of nonlinear electrodynamics of high-temperature superconductors
Nonlinear electrodynamics of high-{Tc} superconductors are studied both theoretically and experimentally. For powdered samples, a novel model is presented in which the metallographically observed superconducting grains in the powder are modeled as superconducting current loops of various areas with weak links. Surprising harmonic generation behavior in an arc field, H{sub 1} cos({omega}t), is predicted by the model; the power at high harmonics show sharp dips almost periodic in a superposing dc magnetic field, revealing flux quantization in the prototype loops in the model. Such oscillation of the harmonic power in dc magnetic field P{sub nf}(H{sub dc}), is indeed experimentally observed in powdered YBa{sub 2}Cu{sub 3}O{sub 7}. Other experimental aspects also agree with model predictions. For bulk sintered cylindrical samples, a generalized critical state model is presented. In this model, the nonlinear electrodynamics are due to flux-pinning, somewhat similar to low-temperature type-II superconductors, but with a more generalized critical current densities` dependence on magnetic field -- J{sub c}(H){approximately}H{sub local}{sup -{beta}}, with {beta} being an adjustable parameter. Experiments in ac and dc magnetic fields on a sintered cylindrical rod of YBa{sub 2}Cu{sub 3}O{sub 7} yield unambiguous evidence of independent inter- and intragranular contributions to the complex harmonic permeability {tilde {mu}}{sub n} = …
Date:
August 1, 1991
Creator:
Lam, Quan-Chiu H.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Studies of nonlinear electrodynamics of high-temperature superconductors
Nonlinear electrodynamics of high-{Tc} superconductors are studied both theoretically and experimentally. For powdered samples, a novel model is presented in which the metallographically observed superconducting grains in the powder are modeled as superconducting current loops of various areas with weak links. Surprising harmonic generation behavior in an arc field, H{sub 1} cos({omega}t), is predicted by the model; the power at high harmonics show sharp dips almost periodic in a superposing dc magnetic field, revealing flux quantization in the prototype loops in the model. Such oscillation of the harmonic power in dc magnetic field P{sub nf}(H{sub dc}), is indeed experimentally observed in powdered YBa{sub 2}Cu{sub 3}O{sub 7}. Other experimental aspects also agree with model predictions. For bulk sintered cylindrical samples, a generalized critical state model is presented. In this model, the nonlinear electrodynamics are due to flux-pinning, somewhat similar to low-temperature type-II superconductors, but with a more generalized critical current densities' dependence on magnetic field -- J{sub c}(H){approximately}H{sub local}{sup -{beta}}, with {beta} being an adjustable parameter. Experiments in ac and dc magnetic fields on a sintered cylindrical rod of YBa{sub 2}Cu{sub 3}O{sub 7} yield unambiguous evidence of independent inter- and intragranular contributions to the complex harmonic permeability {tilde {mu}}{sub n} = …
Date:
August 1, 1991
Creator:
Lam, Quan-Chiu H.
Object Type:
Report
System:
The UNT Digital Library
The Bronco, Yearbook of Hardin-Simmons University, 1991
Yearbook for Hardin-Simmons University in Abilene, Texas includes photos of and information about the university, student body, professors, and organizations.
Date:
1991
Creator:
Hardin-Simmons University
Object Type:
Yearbook
System:
The Portal to Texas History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 89, No. 12, Ed. 1 Thursday, July 4, 1991
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 4, 1991
Creator:
Golden, Larry D.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Hilltop Views (Austin, Tex.), Vol. 6, No. 2, Ed. 1 Monday, September 30, 1991
Biweekly student newspaper from St. Edward's University in Austin, Texas that includes news and information of interest to the college community along with advertising.
Date:
September 30, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 76, No. 39, Ed. 1 Thursday, October 10, 1991
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
October 10, 1991
Creator:
Hoover, Tim
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Aerie, Yearbook of the University of North Texas, 1991
Yearbook for University of North Texas in Denton, Texas includes photos of and information about the school, student body, professors, and organizations. Index starts on page 324.
Date:
1991
Creator:
University of North Texas
Object Type:
Yearbook
System:
The Portal to Texas History
The Muskogee - Okmulgee Oklahoma Eagle (Muskogee and Okmulgee, Okla.), Vol. 18, No. 42, Ed. 1 Thursday, February 7, 1991
Weekly newspaper from Muskogee and Okmulgee, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 7, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Rambler (Fort Worth, Tex.), Vol. 67, No. 15, Ed. 1 Thursday, January 31, 1991
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
January 31, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Yellow Jacket (Brownwood, Tex.), Vol. 79, No. 11, Ed. 1, Thursday, December 5, 1991
Weekly student newspaper from Howard Payne University in Brownwood, Texas that includes local, state and campus news along with advertising.
Date:
December 5, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Prickly Pear, Yearbook of Abilene Christian University, 1991
Yearbook for Abilene Christian University in Abilene, Texas includes photos of and information about the school, student body, professors, and organizations. Index starts on page 354.
Date:
1991
Creator:
Abilene Christian University
Object Type:
Yearbook
System:
The Portal to Texas History
Collegian (Hurst, Tex.), Vol. 3, No. 22, Ed. 1 Wednesday, April 3, 1991
Weekly student newspaper published in Hurst, Texas serving the Tarrant County Junior College District that includes school news and information along with advertising.
Date:
April 3, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Optimist (Abilene, Tex.), Vol. 80, No. 13, Ed. 1, Friday, October 4, 1991
Weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
October 4, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The North Texas Daily (Denton, Tex.), Vol. 73, No. 61, Ed. 1 Thursday, January 24, 1991
Student newspaper from the University of North Texas in Denton, Texas that includes local, state, national, and campus news along with advertising. Formerly The Campus Chat.
Date:
January 24, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The North Texas Daily (Denton, Tex.), Vol. 73, No. 64, Ed. 1 Wednesday, January 30, 1991
Student newspaper from the University of North Texas in Denton, Texas that includes local, state, national, and campus news along with advertising. Formerly The Campus Chat.
Date:
January 30, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The North Texas Daily (Denton, Tex.), Vol. 73, No. 67, Ed. 1 Wednesday, February 6, 1991
Student newspaper from the University of North Texas in Denton, Texas that includes local, state, national, and campus news along with advertising. Formerly The Campus Chat.
Date:
February 6, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History