53 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Computerized Simulation"  
Results: 1 - 24 next
open access

The effect of passive material on the detection of hadrons in calorimeter configurations for the SDC detector

Description: We have used a flexible geometry model of a calorimeter design for SDC to study the effect of passive material in front of the calorimeter and between the barrel and endcap modules on the apparent response to hadrons. The thicknesses of the passive materials have been chosen to closely resemble the currently projected wall thicknesses of the scintillating tile-fiber and liquid-argon calorimeter designs. The liquid-argon model contains about three times the amount of material in its shells compa… more
Date: August 14, 1991
Creator: Kirk, T. B. W. & Trost, H. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Theoretical Treatment of the Thermophysical Properties of Fluids Containing Chain-like Molecules

Description: This research program was designed to enhance our understanding of the behavior of fluids and fluid mixtures containing chain-like molecules. The original objective was to explain and predict the experimentally observed thermophysical properties, including phase equilibria and dynamics, of systems containing long flexible molecules ranging in length from alkanes to polymers. Over the years the objectives were expanded to include the treatment of molecules that were not chain-like. Molecular dyn… more
Date: November 14, 2008
Creator: Hall, Carol K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analysis of the Argonne Distance Tabletop Exercise Method

Description: The purpose of this report is to summarize and evaluate the Argonne Distance Tabletop Exercise (DISTEX) method. DISTEX is intended to facilitate multi-organization, multi-objective tabletop emergency response exercises that permit players to participate from their own facility's incident command center. This report is based on experience during its first use during the FluNami 2007 exercise, which took place from September 19-October 17, 2007. FluNami 2007 exercised the response of local public… more
Date: February 14, 2008
Creator: Tanzman, E. A.; Nieves, L. A. & Sciences, Decision and Information
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Multiple time-scale methods in particle simulations of plasmas

Description: This paper surveys recent advances in the application of multiple time-scale methods to particle simulation of collective phenomena in plasmas. These methods dramatically improve the efficiency of simulating low-frequency kinetic behavior by allowing the use of a large timestep, while retaining accuracy. The numerical schemes surveyed provide selective damping of unwanted high-frequency waves and preserve numerical stability in a variety of physics models: electrostatic, magneto-inductive, Darw… more
Date: February 14, 1985
Creator: Cohen, B.I.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Methods for testing transport models

Description: Substantial progress has been made over the past year on six aspects of the work supported by this grant. As a result, we have in hand for the first time a fairly complete set of transport models and improved statistical methods for testing them against large databases. We also have initial results of such tests. These results indicate that careful application of presently available transport theories can reasonably well produce a remarkably wide variety of tokamak data.
Date: November 14, 1991
Creator: Singer, C. & Cox, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Numerical simulation of secondary electron orbits near an electron beam propagating in a low pressure gas

Description: A numerical simulation has been constructed to obtain a detailed, quantitative estimate of the electromagnetic fields generated in a recently-proposed collective accelerator scheme for electrons. The code treats the secondary electrons by particle simulation and the beam dynamics by a time-dependent envelope model. The simulation gives a fully relativistic description of secondary electrons moving in selfconsistent electromagnetic fields. The calculations are made using coordinates t, x, y, z f… more
Date: August 14, 1985
Creator: Teague, M. R. & Yu, S. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High-temperature, solid oxide electrolyte fuel cell power generating system. Annual report, June 1, 1980-May 31, 1981

Description: Closed-end tubes are now being prepared in-house, for use in fabricating and evaluating the FBA cell design. New perovskite-type mixed oxides are being investigated as air electrode materials and some have been identified and are being used in FBA cell test evaluation studies. Initial FBA cells have been fabricated and tested. Although their performance is below target goals, fabrication procedures for all fuel cell components have been verified for cell construction. Areas of investigation for… more
Date: October 14, 1981
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Geothermal reservoir engineering computer code comparison and validation using the GEONZ simulator program

Description: It was originally proposed to use the GEOTHERM geothermal simulator program to prepare solutions to the first five of the six Department of Energy computer code comparison sets. Valid solutions were anticipated in all of the five problems attempted, but it was expected that problems 3 and 4 might present some difficulties. A more recent version of the program, called GEONZ became available and was used successfully on problems 3 and 4. The new program, GEONZ, had additional capabilities that en… more
Date: November 14, 1980
Creator: Horne, R.N.; Ogbe, D.O.; Temeng, K. & Ramey, H.J. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Methods for testing transport models. Second year annual report

Description: Substantial progress has been made over the past year on six aspects of the work supported by this grant. As a result, we have in hand for the first time a fairly complete set of transport models and improved statistical methods for testing them against large databases. We also have initial results of such tests. These results indicate that careful application of presently available transport theories can reasonably well produce a remarkably wide variety of tokamak data.
Date: November 14, 1991
Creator: Singer, C. & Cox, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Surface Based Differential Forms

Description: Higher-order basis functions have been constructed for surface-based differential forms that are used in engineering simulations. These surface-based forms have been designed to complement the volume-based forms present in EMSolve[1], a finite element code. The basis functions are constructed on a reference element and transformed, as necessary, for each element in space. Lagrange polynomials are used to create the basis functions. This approach is a necessary step in creating a hybrid finite-e… more
Date: December 14, 2004
Creator: Pingenot, J.; Yang, C.; Jandhyala, V.; Champagne, N.; White, D.; Stowell, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

TEM verification of the <111>-type 4-arm multi-junction in [001]-Mo single crystals

Description: To investigate and verify the formation of <111>-type 4-arm multi-junction by the dislocation reaction of 1/2[111] [b1] + 1/2[{bar 1}1{bar 1}] [b2] + 1/2[{bar 1}{bar 1}1] [b3] = 1/2[{bar 1}11] [b4], which has recently been discovered through computer simulations conducted by Vasily Bulatov and his colleagues.
Date: March 14, 2005
Creator: Hsiung, L
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ADVANCED MIXING MODELS

Description: The process of recovering and processing High Level Waste (HLW) the waste in storage tanks at the Savannah River Site (SRS) typically requires mixing the contents of the tank with one to four mixers (pumps) located within the tank. The typical criteria to establish a mixed condition in a tank are based on the number of pumps in operation and the time duration of operation. To ensure that a mixed condition is achieved, operating times are typically set conservatively long. This approach results … more
Date: February 14, 2011
Creator: Lee, S.; Dimenna, R. & Tamburello, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Closures for Course-Grid Simulation of Fluidized Gas-Particle Flows

Description: Gas-particle flows in fluidized beds and riser reactors are inherently unstable, and they manifest fluctuations over a wide range of length and time scales. Two-fluid models for such flows reveal unstable modes whose length scale is as small as ten particle diameters. Yet, because of limited computational resources, gas-particle flows in large fluidized beds are invariably simulated by solving discretized versions of the two-fluid model equations over a coarse spatial grid. Such coarse-grid sim… more
Date: February 14, 2010
Creator: Sundaresan, Sankaran
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Personal computer based decision support system for routing nuclear spent fuel

Description: An approach has been formulated to route nuclear spent fuel over the US Interstate highway network. This approach involves the generation of alternative routes so that any potential adverse impacts will not only concentrate on regions along the shortest path between the nuclear power plant and repository. Extensive literature research on the shortest path finding algorithms has been carried out. Consequently, an extremely efficient shortest path algorithm has been implemented and significantly … more
Date: November 14, 1989
Creator: Chin, Shih-Miao; Joy, D. S.; Johnson, P. E. (Oak Ridge National Lab., TN (USA)); Bobic, S. M. & Miaou, Shaw-Pin (Tennessee Univ., Knoxville, TN (USA). Transportation Center)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Three dimensional digital imaging of environmental data

Description: The Environmental Sciences Section (ESS) of the Savannah River Laboratory has recently acquired the computer hardware (Silicon Graphics Personal Iris Workstations) and software (Dynamic Graphics, Interactive Surface and Volume Modeling) to perform three dimensional analysis of hydrogeologic data. Three dimensional digital imaging of environmental data is a powerful technique that can be used to incorporate field, analytical, and modeling results from geologic, hydrologic, ecologic, and chemical… more
Date: June 14, 1991
Creator: Nichols, R. L. & Eddy, C. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Performance Testing and Validation Plan for HMS4 Quantitative Gamma Measurements, K-25/K-27 D&D Project, East Tennessee Technology Park, Oak Ridge, Tennessee

Description: The Holdup Measurement System 4 (HMS4) is a portable thallium activated sodium iodide (NaI[Tl]) gamma ray energy spectrometer that, when properly calibrated, is able to make quantifiable assessment of U-235 holdup in the presence of other uranium isotopes and prevailing background radiation. The use and calibration of the HMS4 is based upon the methodologies defined by Russo in La-14206, (Russo 2005), where detection efficiency determination protocols are defined (called Generalized Geometry Ho… more
Date: April 14, 2008
Creator: J.W. Thiesing, Tom Donohoue, Jim McCague, Ray Martin, Ralph Royce and Troy Thomas
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluating the Moisture Conditions in the Fractured Rock at YuccaMountain: The Impact of Natural Convection Processes in HeatedEmplacement Drifts

Description: The energy output of the high-level radioactive waste to beemplaced in the proposed geologic repository at Yucca Mountain, Nevada,will strongly affect the thermal-hydrological (TH) conditions in thenear-drift fractured rock. Heating of rock water to above-boilingconditions will induce large water saturation changes and fluxperturbations close to the waste emplacement tunnels (drifts) that willlast several thousand years. Understanding these perturbations isimportant for the performance of the r… more
Date: December 14, 2005
Creator: Birkholzer, J.T.; Webb, S.W.; Halecky, N.; Peterson, P.F. & Bodvarsson, G.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Collaborating for Multi-Scale Chemical Science

Description: Advanced model reduction methods were developed and integrated into the CMCS multiscale chemical science simulation software. The new technologies were used to simulate HCCI engines and burner flames with exceptional fidelity.
Date: July 14, 2006
Creator: Green, William H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Final Technical Report on Grant DE-FG03-00ER15114

Description: The research under this grant has focused on three-dimensional numerical simulations, as well as on computational linear stability analysis. In the following, our main results for each of those areas will be described separately. In addition, copies of reprints are attached with this report.
Date: February 14, 2005
Creator: Meiburg, Eckart
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

System Design Description Salt Well Liquid Pumping Dynamic Simulation

Description: The Salt Well Liquid (SWL) Pumping Dynamic Simulation used by the single-shell tank (SST) Interim Stabilization Project is described. A graphical dynamic simulation predicts SWL removal from 29 SSTs using an exponential function and unique time constant for each SST. Increasing quarterly efficiencies are applied to adjust the pumping rates during fiscal year 2000.
Date: December 14, 1999
Creator: HARMSEN, R.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Summary of Properties Used to Evaluate INEEL Calcine Disposal in the Yucca Mountain Repository

Description: To support evaluations of the direct disposal of Idaho National Engineering and Environmental Laboratory calcines to the repository at Yucca Mountain, an evaluation of the performance of the calcine in the repository environment must be performed. This type of evaluation demonstrates, through computer modeling and analysis, the impact the calcine would have on the ability of the repository to perform its function of containment of materials during the repository lifetime. This report discusses … more
Date: July 14, 2003
Creator: Dahl, C.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Trace Metal Bioremediation: Assessment of Model Components from Laboratory and Field Studies to Identify Critical Variables

Description: The objective of this project was to gain an insight into the modeling support needed for the understanding, design, and operation of trace metal/radionuclide bioremediation. To achieve this objective, a workshop was convened to discuss the elements such a model should contain. A ''protomodel'' was developed, based on the recommendations of the workshop, and was used to perform sensitivity analysis as well as some preliminary simulations in support for bioremediation test experiments at UMTRA s… more
Date: February 14, 2003
Creator: Jaffe, Peter & Rabitz, Herschel
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simulation of Z boson production at D0

Description: This thesis presents the results of some of the author's work in the High Energy Physics Group at Brown University, work done within the framework of the D0 collaboration at the Fermilab National particle accelerator. To allow a broader audience an easier understanding of the experimental data presented, a brief review of the relevant areas of Particle Physics precedes the description of the experimental setup and results. Monte Carlo simulations of Z boson production at the D0 experiment were … more
Date: May 14, 1990
Creator: Ascher, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

TMX-U neutral pressure measurement diagnostic systems

Description: The Tandem Mirror Experiment-Upgrade (TMX-U) has a large and complex system of Baird Alpert, magnetron, and Penning gauges, in addition to mass spectrometers (RGA), all of which measure neutral pressures in the many internal regions of TMX-U. These pressure measurements are used as part of the confinement physics data base as well as for management of the TMX-U vacuum system. Dynamic pressures are modeled by a coupled-volumes simulation code, which includes wall reflus, getter pumping, and plas… more
Date: September 14, 1984
Creator: Pickles, W.L.; Allen, S.L.; Hill, D.N.; Hunt, A.L. & Simonen, T.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen