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489 Matching Results
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Study of intermittency in e sup + e sup minus annihilations at 29 GeV
Charged particle multiplicity distributions from e{sup +}e{sup {minus}} annihilations at 29 GeV have been analyzed in selected rapidity and azimuthal angle intervals. The data were taken with the High Resolution Spectrometer at PEP. The factorial moments of the multiplicity distributions increase as the rapidity interval is decreased, the so-called intermittency phenomenon. These direct measurements of the moments agree with values derived from negative binomial fits to our multiplicity distributions in various central rapidity windows. The factorial moments are also given for the distribution in azimuthal angle around the beam direction and for the two-dimensional distribution in rapidity and azimuthal angle around the jet directions.
Date:
June 15, 1990
Creator:
Abachi, S.; Derrick, M.; Kooijman, P.; Musgrave, B.; Price, L.; Repond, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Study of electron-positron interactions
For the past seven years, this group has been interested in the study of tests of the Standard Model of Electroweak interactions. The program has centered about the AMY experiment which examines the nature of the final state products in electron-positron collisions in the center of mass energy range near 60 GeV. Results of these measurements have shown a remarkable consistency with the predictions of the minimal model of 3 quark and lepton generations and single charged and neutral intermediate bosons. No new particles or excited states have been observed nor has any evidence for departures in cross sections or angular asymmetries from expectations been observed. These conclusions have been even more firmly established by the higher energy results from the LEP and SLC colliders at center of mass energies of about 90 GeV. Our focus is shifting to the neutrino as a probe to electroweak interactions. The relative merit of attempting to observe neutrinos from point sources versus observing neutrinos generally is not easy to predict. The improved ability to interpret is offset by the probably episodic nature of the emission and irreproducibility of the results. In this phase of development, it is best to be sensitive to both …
Date:
September 15, 1990
Creator:
Abashian, A.; Gotow, K. & Philonen, L.
Object Type:
Report
System:
The UNT Digital Library
Report of Foreign Research Assignment for M. M. Abraham, October 1989-September 1990
The traveler collaborated with M.J.M. Leask, J.M. Baker, B. Bleaney, and others at the Clarendon Laboratory, Oxford University, Oxford, UK, to Study Tetragonal rare-earth phosphates and vanadates by optical and magnetic spectroscopy. This work is related to similar studies that have been performed at ORNL by the Synthesis and Properties of Novel Materials Group in the Solid State Division.
Date:
October 15, 1990
Creator:
Abraham, M. M.
Object Type:
Report
System:
The UNT Digital Library
Quantitative non-destructive evaluation of high-temperature superconducting materials
Even though the currently intensive research efforts on high-temperature superconducting materials have not yet converged on a well specified material, the strong indications are that such a material will be brittle, anisotropic, and may contain many flaws such as microcracks and voids at grain boundaries. Consequently, practical applications of high temperature superconducting materials will require a very careful strength analysis based on fracture mechanics considerations. Because of the high sensitivity of the strength of such materials to the presence of defects, methods of quantitative non-destructive evaluation may be expected to play an important role in strength determinations. This proposal is concerned with the use of ultrasonic methods to detect and characterize isolated cracks, clusters of microcracks and microcracks distributed throughout the material. Particular attention will be devoted to relating ultrasonic results directly to deterministic and statistical linear elastic fracture mechanics considerations.
Date:
September 15, 1990
Creator:
Achenbach, J. D.
Object Type:
Report
System:
The UNT Digital Library
Quantitative non-destructive evaluation of high-temperature superconducting materials. Technical progress report, September 1, 1989--August 30, 1990
Even though the currently intensive research efforts on high-temperature superconducting materials have not yet converged on a well specified material, the strong indications are that such a material will be brittle, anisotropic, and may contain many flaws such as microcracks and voids at grain boundaries. Consequently, practical applications of high temperature superconducting materials will require a very careful strength analysis based on fracture mechanics considerations. Because of the high sensitivity of the strength of such materials to the presence of defects, methods of quantitative non-destructive evaluation may be expected to play an important role in strength determinations. This proposal is concerned with the use of ultrasonic methods to detect and characterize isolated cracks, clusters of microcracks and microcracks distributed throughout the material. Particular attention will be devoted to relating ultrasonic results directly to deterministic and statistical linear elastic fracture mechanics considerations.
Date:
September 15, 1990
Creator:
Achenbach, J. D.
Object Type:
Report
System:
The UNT Digital Library
The Paducah Post (Paducah, Tex.), Vol. 84, No. 26, Ed. 1 Wednesday, August 15, 1990
Weekly newspaper from Paducah, Texas that includes local, state, and national news along with advertising.
Date:
August 15, 1990
Creator:
Adams, Patty
Object Type:
Newspaper
System:
The Portal to Texas History
ASSESS (Analytic System and Software for Evaluating Safeguards and Security) update: Current status and future developments
The Analytic System and Software for Evaluating Safeguards and Security (ASSESS) has been released for use by DOE field offices and their contractors. In October, 1989, we offered a prototype workshop to selected representatives of the DOE community. Based on the prototype results, we held the first training workshop at the Central Training Academy in January, 1990. Four additional workshops are scheduled for FY 1990. ASSESS is a state-of-the-art analytical tool for management to conduct integrated evaluation of safeguards systems at facilities handling facilities. Currently, ASSESS focuses on the threat of theft/diversion of special nuclear material by insiders, outsiders, and a special form of insider/outsider collusion. ASSESS also includes a neutralization module. Development of the tool is continuing. Plans are underway to expand the capabilities of ASSESS to evaluate against violent insiders, to validate the databases, to expand the neutralization module, and to assist in demonstrating compliance with DOE Material Control and Accountability (MC A) Order 5633.3. These new capabilities include the ability to: compute a weighted average for performance capability against a spectrum of insider adversaries; conduct defense-in-depth analyses; and analyze against protracted theft scenarios. As they become available, these capabilities will be incorporated in our training program. ASSESS …
Date:
July 15, 1990
Creator:
Al-Ayat, R.A. (Lawrence Livermore National Lab., CA (USA)); Cousins, T.D. (USDOE, Washington, DC (USA)) & Hoover, E.R. (Sandia National Labs., Albuquerque, NM (USA))
Object Type:
Article
System:
The UNT Digital Library
Hadroproduction of charm at Fermilab E769
Experiment E769 at Fermilab obtained charm hadroproduction data during the 1987-88 Fixed Target running period with a 250 GeV hadron beam incident on thin target foils of Be, Al, Cu, and W. From an analysis of 25% of the recorded 400M trigger sample we have explored the Feynman x, p{sub t}{sup 2} and the atomic number dependence of charm quark production using samples of D{sup +} and D{sup 0} mesons. 7 refs., 4 figs.
Date:
November 15, 1990
Creator:
Alves, G. A.; Anjos, J. C.; de Mello Neto, J. R. T.; de Miranda, J. M.; da Motta, H.; dos Reis, A. C. et al.
Object Type:
Article
System:
The UNT Digital Library
The Colony Leader (The Colony, Tex.), Vol. 9, No. 38, Ed. 1 Wednesday, August 15, 1990
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
August 15, 1990
Creator:
Ball, Jeffrey
Object Type:
Newspaper
System:
The Portal to Texas History
[Letter from George Barbary to the Lesbian/Gay Political Coalition of Dallas dated January 15, 1990]
Letter from George Barbary sent to the Lesbian/Gay Political Coalition of Dallas on January 15, 1990 in response to their questionnaire.
Date:
January 15, 1990
Creator:
Barbary, George F.
Object Type:
Letter
System:
The UNT Digital Library
Rains County Leader (Emory, Tex.), Vol. 102, No. 35, Ed. 1 Thursday, February 15, 1990
Weekly newspaper from Emory, Texas that includes local, state, and national news along with advertising.
Date:
February 15, 1990
Creator:
Becknell, Kathleen Hill
Object Type:
Newspaper
System:
The Portal to Texas History
Rains County Leader (Emory, Tex.), Vol. 102, No. 39, Ed. 1 Thursday, March 15, 1990
Weekly newspaper from Emory, Texas that includes local, state, and national news along with advertising.
Date:
March 15, 1990
Creator:
Becknell, Kathleen Hill
Object Type:
Newspaper
System:
The Portal to Texas History
Rains County Leader (Emory, Tex.), Vol. 103, No. 23, Ed. 1 Thursday, November 15, 1990
Weekly newspaper from Emory, Texas that includes local, state, and national news along with advertising.
Date:
November 15, 1990
Creator:
Becknell, Kathleen Hill
Object Type:
Newspaper
System:
The Portal to Texas History
Technical studies on a composite groundwater sample from F- and H-Area
A composite sample of groundwater from F- and H-Areas was collected by Waste Management Tech and delivered to the Savannah River Laboratory to use in preliminary experiments that would test three remediation technologies under consideration. The three technologies are pH adjustment and filtration, decontamination with a strong acid ion exchange resin, and decontamination with a chelating ion exchange resin.
Date:
August 15, 1990
Creator:
Bibler, J. P.
Object Type:
Report
System:
The UNT Digital Library
Technical studies on a composite groundwater sample from F- and H-Area
A composite sample of groundwater from F- and H-Areas was collected by Waste Management Tech and delivered to the Savannah River Laboratory to use in preliminary experiments that would test three remediation technologies under consideration. The three technologies are pH adjustment and filtration, decontamination with a strong acid ion exchange resin, and decontamination with a chelating ion exchange resin.
Date:
August 15, 1990
Creator:
Bibler, J. P.
Object Type:
Report
System:
The UNT Digital Library
The Sachse Sentinel (Sachse, Tex.), Vol. 15, No. 33, Ed. 1 Wednesday, August 15, 1990
Weekly newspaper from Sachse, Texas that includes local news and advertising.
Date:
August 15, 1990
Creator:
Blakey, Darlene
Object Type:
Newspaper
System:
The Portal to Texas History
Reflection mass spectrometry technique for monitoring and controlling composition during molecular beam epitaxy
This invention is comprised of a method for on-line accurate monitoring and precise control of molecular beam epitaxial growth of Groups III-III-V or Groups III-V-V layers in an advanced semiconductor device incorporates reflection mass spectrometry. The reflection mass spectrometry is responsive to intentional perturbations in molecular fluxes incident on a substrate by accurately measuring the molecular fluxes reflected from the substrate. The reflected flux is extremely sensitive to the state of the growing surface and the measurements obtained enable control of newly forming surfaces that are dynamically changing as a result of growth.
Date:
August 15, 1990
Creator:
Brennan, T. M.; Hammons, B. E. & Tsao, J. Y.
Object Type:
Patent
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 96, No. 30, Ed. 1 Thursday, February 15, 1990
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
February 15, 1990
Creator:
Bridges, G. Frank
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 96, No. 34, Ed. 1 Thursday, March 15, 1990
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
March 15, 1990
Creator:
Bridges, G. Frank
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 97, No. 17, Ed. 1 Thursday, November 15, 1990
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
November 15, 1990
Creator:
Bridges, G. Frank
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 68, No. 65, Ed. 1 Monday, January 15, 1990
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
January 15, 1990
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 68, No. 92, Ed. 1 Thursday, February 15, 1990
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 15, 1990
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 68, No. 116, Ed. 1 Thursday, March 15, 1990
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 15, 1990
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 68, No. 142, Ed. 1 Sunday, April 15, 1990
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
April 15, 1990
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History