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Time resolution performance studies of contemporary high speed photomultipliers

Description: The time resolution capabilities of prototype microchannel plate and static crossed-field photomultipliers have been investigated. Measurements were made of electron transit time, rise time, time response, single photoelectron time spread and multiphotoelectron time spread for LEP HR350 proximity focused high gain curved microchannel plate and VPM-154A/1.6L static crossed-field photomultipliers. The experimental data have been compared with results obtained with conventionally designed RCS 8850… more
Date: October 5, 1977
Creator: Leskovar, B. & Lo, C.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Three-dimensional thermal analysis of a baseline spent fuel repository

Description: A three-dimensional thermal analysis has been performed using finite difference techniques to determine the near-field response of a baseline spent fuel repository in a deep geologic salt medium. A baseline design incorporates previous thermal modeling experience and OWI recommendations for areal thermal loading in specifying the waste form properties, package details, and emplacement configuration. The base case in this thermal analysis considers one 10-year old PWR spent fuel assembly emplace… more
Date: June 5, 1980
Creator: Altenbach, T.J. & Lowry, W.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Investigation of photovoltaic mechanisms in polycrystalline thin-film solar cells. Interim technical report, November 1, 1980-July 31, 1981

Description: Effort is reported on measurement technique development to assess the utility of Deep-Level Transient Spectroscopy (DLTS) methods in characterizing polycrystalline silicon that was deliberately doped with Ti during growth. Difficulties encountered with lateral DLTS measurements are discussed. In this approach, modulation of the grain boundary, double-depletion region produces the entire DLTS signal. Major effort has been applied in grain boundary characterization and control. The most significa… more
Date: March 5, 1982
Creator: Temofonte, T. A.; Szedon, J. R. & O'Keeffe, T. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Application of digital image analysis techniques to the Geyser's data and topography

Description: This paper describes the results of digital image analysis and techniques applied to acoustic sounder data and topographic relief in the Geyser's region. The two dimensional fast Fourier transform (2DFFT) represents the spacial variability of a photographic image. The spacial variability of topography in complex terrain can be represented in this way and insight into degree of complexity and dominating spacial wavelengths can be gained. This was performed for a 16 km square digitized topographi… more
Date: May 5, 1980
Creator: Porch, W.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Cedar Project---Original goals and progress to date

Description: This report describes: Cedar System Hardware; Compiler and Software Issues on Memory Management; Operating Systems; Compilers; and Multiprocessor Performance on Algorithms and Applications.
Date: September 5, 1991
Creator: Cybenko, G.; Kuck, D.; Padua, D. & Gallopoulos, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Advanced Large Area Plastic Scintillator Project (ALPS): Final Report

Description: The advanced Large-Area Plastic Scintillator (ALPS) Project at Pacific Northwest National Laboratory investigated possible technological avenues for substantially advancing the state-of-the-art in gamma-ray detection via large-area plastic scintillators. The three predominant themes of these investigations comprised the following: * Maximizing light collection efficiency from a single large-area sheet of plastic scintillator, and optimizing hardware event trigger definition to retain detection … more
Date: February 5, 2008
Creator: Jordan, David V.; Reeder, Paul L.; Todd, Lindsay C.; Warren, Glen A.; McCormick, Kathleen R.; Stephens, Daniel L. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Total cross sections and elastic scattering at the SSC

Description: The need is discussed of a special purpose detector for the measurement of elastic scattering at the SSC. The detector would cover as small a solid angle as is practical. Two techniques are described briefly to measure total cross sections at hadron storage rings. The direct method is to measure the interaction rate in an IR of known luminosity - a method that gets more difficult increasing energy. A second method is to use the optical theorem. 6 refs., 1 fig. (LEW)
Date: December 5, 1985
Creator: Foley, K.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Phase 2 of the Array Automated Assembly Task for the Low Cost Solar Array Project. Quarterly report No. 7, April 1-June 30, 1979

Description: The major objective of this program is to define and verify a process sequence for the fabrication of solar cell modules from dendritic web silicon. Another objective is the development of key process steps. The process sequence and the individual steps must be amenable to automation and low cost manufacturing methods so that the target selling price of $0.70/watt peak (1980$ in 1986) can be achieved. Two process specifications supplied by other contractors have been tested. The Al Silk Screeni… more
Date: September 5, 1979
Creator: Campbell, R. B.; Rai-Choudhury, P.; Seman, E. J.; Rohatgi, A.; Davis, J. R.; Ostroski, J. W. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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First measurement of the left-right cross section asymmetry in Z boson production at E{sub cm} = 91.5 GeV

Description: The left-right cross section asymmetry for Z boson production in e{sup +} e{sup {minus}} annihilation (A{sub LR}) is being measured at E{sub cm} 91.5 GeV with the SLD detector at the SLAC Linear Collider (SLC) using a longitudinally polarized electron beam. The electron polarization is continually monitored with a Compton scattering polarimeter, and is typically 22%. At the current time, we have accumulated a sample of 4779 Z events. We find that A{sub LR} = 0.02 {double_bond} 0.07 {doteq} 0.00… more
Date: August 5, 1992
Creator: Collaboration, SLD
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Lot No. 2 of Frit 202 for DWPF cold runs

Description: In the DWPF (Defense Waste Processing Facility), glass forming chemicals will be added to the waste in the form of premelted glass frit. On an oxide weight basis, DWPF glass will consist of approximately 64 wt% glass frit, 8 wt% precipitate hydrolysis aqueous product, and 28 wt% sludge. The glass frit and the precipitate hydrolysis aqueous product together make up what is called the glass-former composition. Current plants are to control the composition of the frit through the procurement speci… more
Date: April 5, 1993
Creator: Schumacher, R. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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First principles theory of disordered alloys and alloy phase stability

Description: These lecture notes review the LDA-KKR-CPA method for treating the electronic structure and energetics of random alloys and the MF-CF and GPM theories of ordering and phase stability built on the LDA- KKR-CPA description of the disordered phase. Section 2 lays out the basic LDA-KKR-CPA theory of random alloys and some applications. Section 3 reviews the progress made in understanding specific ordering phenomena in binary solid solutions base on the MF-CF and GPM theories of ordering and phase s… more
Date: June 5, 1993
Creator: Stocks, G. M.; Nicholson, D. M. C. & Shelton, W. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Status of {alpha}{sub s} measurements

Description: I review the current determinations of {alpha}{sub s}. Attention is given to the theoretical uncertainties inherent in most determinations. all current determinations are consistent with an average of {alpha}{sub s}(M{sub Z}) = 0.119{plus_minus}0.005. Prospects for reduction of the errors in the future are discussed.
Date: May 5, 1993
Creator: Hinchliffe, I.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radiative divertor modeling studies

Description: A two-dimensional fluid code called UEDGE is used to simulate the edge plasma in tokamak divertors and to evaluate methods for reducing the heat load on divertor plates by radiating some of the power before it reaches the plates. UEDGE is a fully-implicit code being developed jointly by us, D. A. Knoll and R. B. Campbell. For these studies, UEDGE uses a banded matrix solver and a fixed-fraction impurity model. Work is presently underway with Knoll and Campbell to include a memory-efficient iter… more
Date: May 5, 1993
Creator: Rensink, M. E.; Allen, S. L.; Hill, D. N.; Kaiser, T. B. & Rognlien, T. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Measurement of source tube radial position in cast EMC testbeam module

Description: Using a {sup 137}Cs source we have determined the position of two of the source tubes embedded in the Pb absorber in the cast EMC module used in the Fermilab test beam. Two scintillator tiles placed in the gaps on both sides of an absorber containing a source tube were readout into independent phototubes. The difference in scintillator response was measured in two towers at two different source tube layers. We find the source tube to be displaced towards the (radial) front of the EMC by about 1… more
Date: May 5, 1993
Creator: Jankowski, D. J. & Stanek, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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17-keV x-ray output of plutonium

Description: In the production of plutonium in a reactor, plutonium-238, 240, and 241 are formed as well as Pu{sup 239}. It is well known that the specific alpha activity of the plutonium varies as the percentages of these isotopes are changed. Kinderman, et al have worked out the relationship between isotopic content and MWD/ton exposure. Their findings are reported in this document.
Date: November 5, 1958
Creator: McCall, R. C. & Bernard, R. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Climate Modeling using High-Performance Computing

Description: The Center for Applied Scientific Computing (CASC) and the LLNL Climate and Carbon Science Group of Energy and Environment (E and E) are working together to improve predictions of future climate by applying the best available computational methods and computer resources to this problem. Over the last decade, researchers at the Lawrence Livermore National Laboratory (LLNL) have developed a number of climate models that provide state-of-the-art simulations on a wide variety of massively parallel … more
Date: February 5, 2007
Creator: Mirin, A. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Simple example of track finding by Fourier transform and possibilities for vector or optical processors

Description: Simple examples of finding tracks by Fourier transform with filter or correlation function are presented. Possibilities for using this method in more complicated real situations and the processing times which might be achieved are discussed. The method imitates the simplest examples in the literature on optical pattern recognition and optical processing. The possible benefits of the method are in speed of processing in the optical Fourier transform wherein an entire picture is processed simulta… more
Date: September 5, 1986
Creator: Underwood, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Three-group NPR core flux levels

Description: In order to predict graphite damage rates for the NPE, it is necessary to have some knowledge of the neutron fluxes at various energy levels. In particular it is important to know flux levels relative to those existing where graphite samples have been irradiated experimentally. Three-group flux levels have been calculated for regions far from boundaries in the core of the NPR and of a K-reactor. The results reported here have been obtained from more detailed calculations using better cross sect… more
Date: January 5, 1960
Creator: Simpson, D. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Nano Vacancy Clusters and Trap Limited Diffusion of Si Interstitials in Silicon

Description: The objective of this project is to develop a method to characterize nano vacancy clusters and the dynamics of their formation in ion-irradiated silicon. It will impact (1) semiconductor device processing involving ion implantation, and (2) device design concerning irradiation hardness in harsh environments. It also aims to enhance minority participation in research and curricula on emerging materials and ion beam science. Vacancy defects are of scientific and technological importance since the… more
Date: May 5, 2010
Creator: Chu, Prof. Wei-Kan
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The KamLAND Full-Volume Calibration System

Description: We have successfully built and operated a source deployment system for the KamLAND detector. This system was used to position radioactive sources throughout the delicate 1-kton liquid scintillator volume, while meeting stringent material cleanliness, material compatibility, and safety requirements. The calibration data obtained with this device were used to fully characterize detector position and energy reconstruction biases. As a result, the uncertainty in the size of the detector fiducial vo… more
Date: March 5, 2009
Creator: Collaboration, KamLAND; Berger, B. E.; Busenitz, J.; Classen, T.; Decowski, M. P.; Dwyer, D. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Computational Analysis of Coriant and PNNL Radioxenon Data Viewers

Description: The analysis by Coriant of the beta-gamma coincidence data coming from the ARSA systems show a systematic basis towards lower concentrations for all isotopes and a systematic increase in the minimum detectable concentrations. These variations can be directly traced to the method of analysis that is used by the Coriant software compared to the methods that have been developed by the International Noble Gas Experiment collaboration. This report details the differences and suggests solutions where… more
Date: October 5, 2005
Creator: McIntyre, Justin I. & Carman, April J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Simulations of a stretching bar using a plasticity model from the shear transformation zone theory

Description: An Eulerian simulation is developed to study an elastoplastic model of amorphous materials that is based upon the shear transformation zone theory developed by Langer and coworkers. In this theory, plastic deformation is controlled by an effective temperature that measures the amount of configurational disorder in the material. The simulation is used to model ductile fracture in a stretching bar that initially contains a small notch, and the effects of many of the model parameters are examined.… more
Date: June 5, 2010
Creator: Rycroft, Chris H. & Gibou, Frederic
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Visual display of reservoir parameters affecting enhanced oil recovery. Quarterly report, April 1995--June 1995. 2nd Quarter, FY 1995

Description: This report describes the development of a Spatial Database Manager (SDBM) shell/interface which will provide information to users on how to collect, store, analyze, interpret, visualize and present data in an integrated reservoir characterization study. SDBM will provide access to various geologic, reservoir visual data via a well log interpretation program (Crocker Petrolog), mapping and cross section software ( the GeoGraphix Exploration System Workbench) and a volume visualization applicati… more
Date: April 5, 1995
Creator: Wood, J.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Final report, DOE Grant DE-FG02-98ER25352, Computational semidefinite programming

Description: Semidefinite programming (SDP) is an extension of linear programming, with vector variables replaced by matrix variables and component wise nonnegativity replaced by positive semidefiniteness. SDP's are convex, but not polyhedral, optimization problems. SDP is well on its way to becoming an established paradigm in optimization, with many current potential applications. Consequently, efficient methods and software for solving SDP's are of great importance. During the award period, attention was … more
Date: September 5, 2002
Creator: Overton, Michael L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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