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in publisher: "University of California, Santa Barbara"

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Report of the Intermediate-)ital p)/sub Perpendicular/ Detector Group: A Beauty Spectrometer for the SSC (Superconducting Super Collider)

A ''Beauty Spectrometer'' has been designed for studies of B physics at the SSC. The ultimate goal is a definitive measurement of CP violation in the B system. The spectrometer consists of two stages and occupies one side of an intermediate-luminosity interaction region. An upstream, or intermediate, stage extends from the interaction point to 14 m and covers the angular region from 57 mrad (3.3 degree) to 350 mrad (20 degree). The forward stage extends to 77 m and to angles down to 5.7 mrad. T… more

Date: July 1, 1987

Creator: Foley, K. J.; Buchanan, C. D.; Morrison, R. J.; McHugh, S. W.; Witherell, M. S.; Atac, M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

[Bifurcations and Patterns in Nonlinear Dissifative Systems]

This report discusses the following topics: Rayleigh-Benard convection with an imposed horizontal flow; Rayleigh-Benard convection in a gas under non-boussinesq conditions; electro- convection in a nematic liquid crystal; and Rayleigh-Benard convection in a nematic liquid crystal. (LSP)

Date: February 26, 1992

Creator: Ahlers, G. & Cannell, D. S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Composite Model of Microstructural Evolution in Austenitic Stainless Steel Under Fast Neutron Irradiation

A rate-theory-based model has been developed which includes the simultaneous evolution of the dislocation and cavity components of the microstructure of irradiated austenitic stainless steels. Previous work has generally focused on developing models for void swelling while neglecting the time dependence of the dislocation structure. These models have broadened our understanding of the physical processes that give rise to swelling, e.g., the role of helium and void formation from critically-size… more

Date: January 1, 1986

Creator: Stoller, R. E. & Odette, G. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Impact of Swelling on Fusion Reactor First Wall Lifetime

The impact of swelling in 20% cold-worked Type 316 stainless steel on first wall lifetime is assessed. Three separate predictive swelling correlations, two of which are empirically derived from available fission reactor data and one which is largely based upon a theoretical model, have been used. The swelling equations have been incorporated into a materials lifetime code that examines the temperature-stress-strain-radiation effects history of fusion components. The code has been applied to the… more

Date: January 1, 1983

Creator: Mattas, R. F.; Garner, F. A.; Grossbeck, M. L.; Maziasz, P. J.; Odette, G. R. & Stoller, R. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Lorentz Angle Studies for the SLD Endcap Cerenkov Ring Imaging Detector

The design of the endcap Cerenkov Ring Imaging Detectors for SLD requires a detailed understanding of how electrons drift in gases under the influence of crossed electric and magnetic fields. In this report, we present recent measurements of Lorentz angles and drift velocities in gases suitable for the endcap CRID photon detectors. We compare these measurements to predictions from a theoretical model; good agreement is observed. Based on our results we present a design for detectors operating i… more

Date: November 1, 1987

Creator: Coyle, P.; Cavalli-Sforza, M.; Coyne, D.; Schneider, M.; Spencer, E.; Williams, D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Photoelectrochemical Hydrogen Production Using New Combinatorial Chemistry Derived Materials

Solar photoelectrochemical water-splitting has long been viewed as one of the “holy grails” of chemistry because of its potential impact as a clean, renewable method of fuel production. Several known photocatalytic semiconductors can be used; however, the fundamental mechanisms of the process remain poorly understood and no known material has the required properties for cost effective hydrogen production. In order to investigate morphological and compositional variations in metal oxides as they… more

Date: October 25, 2004

Creator: Jaramillo, Thomas F.; Baeck, Sung-Hyeon; Kleiman-Shwarsctein, Alan; Stucky, Galen D. (PI) & McFarland, Eric W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Development of Low Noise Preamplifier for the Detection and Position Determination of Single Electrons in a Cerenkov Ring Imaging Detector by Charge Division

A preamplifier having 500 electrons noise (rms) has been developed for the detection and location of single electrons in a CRID detector at the SLD. A single channel contains preamp, RC-CR shaper, gain adjustment, driver, and calibration circuitry. Noise and linearity measurements are presented.

Date: October 1, 1987

Creator: Spencer, E.; Coyle, P.; Williams, D.; Bienz, T.; Bird, F.; Gaillard, M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A Search for Flavour Changing Neutral Current Processes in Decays of Charmed Mesons

Neutral current interactions are known from studies of K meson decays to conserve flavor to a high precision. Although flavor changing neutral currents (FCNC) are forbidden in the Weinberg-Salam model, many extensions of the Standard Model allow such processes. We present preliminary upper limits on FCNC-mediated decays of charmed particles, namely D/sup 0/ ..-->.. e/sup +/e/sup -/, D/sup 0/ ..-->.. ..mu../sup +/..mu../sup -/, D/sup 0/ ..-->.. ..mu..e and D/sup +/ ..-->.. ..pi../sup +/..mu..e.

Date: September 1, 1987

Creator: Anjos, J. C.; Appel, J. A.; Bracker, S. B.; Browder, T. E.; Cremaldi, L. M.; Elliott, J. R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Proposal for a CLEO Precision Vertex Detector

Fermilab experiment E691 and CERN experiment NA32 have demonstrated the enormous power of precision vertexing for studying heavy quark physics. Nearly all collider experiments now have or are installing precision vertex detectors. This is a proposal for a precision vertex detector for CLEO, which will be the pre-eminent heavy quark experiment for at least the next 5 years. The purpose of a precision vertex detector for CLEO is to enhance the capabilities for isolating B, charm, and tau decays a… more

Date: January 1, 1991

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A Study of the Semileptonic Decay Mode D/Sup 0/. -->. K/Sup -/E/Sup +/Nu/Sub E/

We present an analysis of the exclusive semileptonic decay mode D/sup 0/ ..-->.. K/sup -/e/sup +/nu/sub e/. We have measured the ratio of decay rates GAMMA(D/sup 0/ ..-->.. K/sup -/e/sup +/nu/sub e/)/GAMMA(D/sup 0/ ..-->.. K/sup -/..pi../sup +/). After correcting for the reconstruction efficiencies and subtracting the contribution from other decay modes we have found the ratio to be equal to 0.77 +- 0.12(stat) +- 0.13(syst).

Date: September 1, 1987

Creator: Anjos, J. C.; Appel, J. A.; Bracker, S. B.; Browder, T. E.; Cremaldi, L. M.; Elliott, J. R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

LBL/UCSB /sup 76/Ge Double Beta Decay Experiment: First Results

A paper given at the IEEE Nuclear Science Symposium last year presented the scientific justification for this experiment and discussed the design of the detector system. At the present time two of the dual detector systems (i.e., four out of a final total of eight detectors) are operating in the complete active/passive shield in the low background laboratory at LBL. Early results (1620 h) of an experiment using two detectors yield a limit of 4 x 10/sup 22/ years (68% confidence) for the half li… more

Date: October 1, 1984

Creator: Goulding, F. S.; Cork, C. P.; Landis, D. A.; Luke, P. N.; Madden, N. W.; Malone, D. F. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Duty cycle testing and performance evaluation of the SM-229 teleoperator

This paper contains the first known experimental studies and analyses of teleoperator performance for specific duty cycles. The results are presented in two distinct areas as position usage patterns, and as three-dimensional power grids. The position usage patterns are a valuable means to assess the available motion range. The power grids are a unique concept for evaluating joint performance. Final conclusions contain recommendations to upgrade the teleoperator for optimum performance. 3 refs.,… more

Date: November 1, 1985

Creator: Stoughton, R. S. & Kuban, D. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Charm Photoproduction Results from Fermilab E-516

Results are presented from FNAL E-516 on charm photoproduction at an average energy of 103 GeV. The cross sections are given for inelastic and elastic psi photoproduction on hydrogen. Clean signals are seen for the decay D*/sup + -/ ..-->.. ..pi../sup + -/D/sup 0/, with the D/sup 0/ decaying into K/sup - +/..pi../sup + -/..pi../sup 0/. These were used to study the branching ratios for D/sup 0/ to K/sup -/..pi../sup +/..pi../sup 0/, K/sup -/rho/sup +/, K*/sup -/..pi../sup +/ and anti K*/sup 0/..… more

Date: January 1, 1983

Creator: Witherell, M. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Effect of Pulsed HVEM Irradiation on Microstructure Evolution in a Simple Fe-Ni-Cr Alloy

The effect of pulsed electron irradiation on microstructure evolution was studied in a simple Fe-Ni-Cr alloy and the results compared with a theoretical model. Pulse periods of 2.5 to 60 seconds (duty factor near 50%) at 600/sup 0/C significantly reduced the maximum swelling rate compared to continuous irradiation. The void concentration was observed to increase and void size and swelling rates to decrease for the pulsed cases compared to the steady irradiation. Preliminary model calculations w… more

Date: January 1, 1979

Creator: Powell, R. W. & Odette, G. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

[The Activation and Decomposition of Alkanes on Group Viii Transition Metal Surfaces: Dynamics, Kinetics and Spectroscopy]

Significant progress has been achieved in a number of areas with the support of this Department of Energy grant which began on July 1, 1989. We have quantified experimentally the kinetics of the initial (low-coverage) alkane activation reaction, i.e., alkane {yields} alkyl + hydrogen adatom, for the following systems: (1) C{sub 2}H{sub 6} on Ir(110)-(1{times}2), and (2) CH{sub 4}, CD{sub 4}, C{sub 2}H{sub 6} and C{sub 2}D{sub 6} on Pt(110)-(1{times}2). In addition, we have employed dynamic Mont… more

Date: January 1, 1990

Creator: Weinberg, W. H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Image Analysis for Facility Siting: A Comparison of Low- and High-Altitude Image Interpretability for Land Use/Land Cover Mapping

For two test sites in Pennsylvania the interpretability of commercially acquired low-altitude and existing high-altitude aerial photography are documented in terms of time, costs, and accuracy for Anderson Level II land use/land cover mapping. Information extracted from the imagery is to be used in the evaluation process for siting energy facilities. Land use/land cover maps were drawn at 1:24,000 scale using commercially flown color infrared photography obtained from the United States Geologic… more

Date: January 1, 1982

Creator: Borella, H. M.; Estes, J. E.; Ezra, C. E.; Scepan, J. & Tinney, L. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Impact of Advanced Microstructural Characterization Techniques on Modeling and Analysis of Radiation Damage

The evolution of radiation-induced alterations of dimensional and mechanical properties has been shown to be a direct and often predictable consequence of radiation-induced microstructural changes. Recent advances in understanding of the nature and role of each microstructural component in determining the property of interest has led to a reappraisal of the type and priority of data needed for further model development. This paper presents an overview of the types of modeling and analysis activ… more

Date: January 1, 1980

Creator: Garner, F. A. & Odette, G. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Some Natural Zeolites: Recent Thermodynamic Results, Their Application, and the Estimation of Missing Thermodynamic Quantities

New calorimetric measurements are reported on the following minerals: analcime, dehydrated analcime, natrolite, scolecite, mesolite, and heulandite. The thermodynamic quantities determined include the standard enthalpy of formation, ..delta..H{sub f}{sup 0} (298{sup 0}K), the high- and low-temperature enthalpy increments, H{sup 0} (T) - H{sup 0} (298{sup 0}K), the low-temperature (5 to 350{sup 0}K) heat capacity, C{sub p}{sup 0} (T), the standard entropy, S{sup 0} (T), and the Gibbs energy of f… more

Date: January 1, 1982

Creator: O'Hare, P. A. G.; Johnson, G. K.; Flotow, H. E. & Wise, W. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Charm Photoproduction Results From the Fermilab Tagged Photon Spectrometer

We report results from a preliminary analysis of approximately 30 million reconstructed events (30% of the data) from E-691, a charm photoproduction experiment conducted at the Fermilab Tagged Photon Laboratory in 1985. We present ratios of antiparticles to particles, p/sub T//sup 2/ distributions, x/sub F/ distributions, the total charm production cross-section and its energy dependence and the fraction of D/sup 0/s from D*s.

Date: February 1, 1987

Creator: Anjos, J. C.; Appel, J. A.; Bracker, S. B.; Browder, T. E.; Cremaldi, L. M.; Elliott, J. R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Study of Proton Hole States in 1f/sub 7/2/ Nuclei by the (p,2p) Reaction at 46 MeV

Proton hole states in the 1f/sub 7/2/ nuclei /sup 46/Ti, /sup 54/Fe, /sup 56/Fe, /sup 58/Ni, and /sup 60/Ni have been studied with the (p,2p) reaction with 46-MeV protons. The measured binding energies and angular correlations are consistent with the binding energies and orbital angular momentum assignments (1f/sub 7/2/, 2s/sub 1/2/, and 1d/sub 3/2/) obtained from proton pick-up reactions. 3 figures, 1 table.

Date: March 1, 1970

Creator: Bertrand, F.; Eisberg, R.; Ingham, D.; Makino, M. & Waddell, C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

[Development and Testing of Theories of Population Dynamics]. First Annual Report

We report new analyses to test competing models of the Daphnia/algal interaction. Our model is good at predicting equilibrium algal densities, and if our new insights can account for stability in this system across a wide range of natural environments, this may contribute to understanding predator-prey dynamics in general.

Date: March 15, 1990

Creator: Murdoch, W. W.; Bence, J. R.; McCauley, E. & Nisbet, R. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

[Bifurcations and Patterns in Nonlinear Dissifative Systems]. Progress Report

Date: February 26, 1992

Creator: Ahlers, G. & Cannell, D. S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Development & Optimization of Materials and Processes for a Cost Effective Photoelectrochemical Hydrogen Production System

The overall project objective was to apply high throughput experimentation and combinatorial methods together with novel syntheses to discover and optimize efficient, practical, and economically sustainable materials for photoelectrochemical production of bulk hydrogen from water. Automated electrochemical synthesis and photoelectrochemical screening systems were designed and constructed and used to study a variety of new photoelectrocatalytic materials. We evaluated photocatalytic performance … more

Date: January 17, 2011

Creator: McFarland, Eric W.

Item Type: Text

Partner: UNT Libraries Government Documents Department

open access

Condensed Matter Research Using the UCSB FEL. [Univ. of California, Santa Barbara Free Electron Laser project]

The University of California, Santa Barbara (UCSB) Free Electron Laser (FEL) project was initiated in 1981 to test the idea of using an electrostatic accelerator in a recirculating beam mode to produce high-power, continuously tunable, coherent far infrared radiation. The development and application of this device to condensed matter research are briefly recounted. Emphasis was on semiconductor research and two-photon experiments. (RWR)

Date: January 1, 1992

Item Type: Report

Partner: UNT Libraries Government Documents Department