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Advanced computer techniques for inverse modeling of electric current in cardiac tissue

Description: For many years, ECG`s and vector cardiograms have been the tools of choice for non-invasive diagnosis of cardiac conduction problems, such as found in reentrant tachycardia or Wolff-Parkinson-White (WPW) syndrome. Through skillful analysis of these skin-surface measurements of cardiac generated electric currents, a physician can deduce the general location of heart conduction irregularities. Using a combination of high-fidelity geometry modeling, advanced mathematical algorithms and massively p… more
Date: August 1, 1996
Creator: Hutchinson, Scott A.; Romero, Louis A. & Diegert, Carl F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Minimum TI4085D interlock setpoint at 1.0 GPM sludge-only feed rate and 14,000 ppm TOC

Description: DWPF-Engineering requested that SRTC determine the minimum indicated melter vapor space temperature that must be maintained in order to minimize the potential for off-gas flammability during a steady sludge-only feeding operation at 1.0 GPM containing 14,000 ppm total organic carbon. The detailed scope of this request is described in the technical task request, HLW-DWPF-TTR-960092 (DWPT Activity No. DWPT-96-0065). In response to this request, a dynamic simulation study was conducted in which th… more
Date: November 5, 1996
Creator: Choi, A.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

In-facility transport code review

Description: The following computer codes were reviewed by the In-Facility Transport Working Group for application to the in-facility transport of radioactive aerosols, flammable gases, and/or toxic gases: (1) CONTAIN, (2) FIRAC, (3) GASFLOW, (4) KBERT, and (5) MELCOR. Based on the review criteria as described in this report and the versions of each code available at the time of the review, MELCOR is the best code for the analysis of in-facility transport when multidimensional effects are not significant. W… more
Date: July 1, 1996
Creator: Spore, J. W.; Boyack, B. E. & Bohl, W. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Prototype demonstration of radiation therapy planning code system

Description: This is the final report of a one-year, Laboratory-Directed Research and Development project at the Los Alamos National Laboratory (LANL). Radiation therapy planning is the process by which a radiation oncologist plans a treatment protocol for a patient preparing to undergo radiation therapy. The objective is to develop a protocol that delivers sufficient radiation dose to the entire tumor volume, while minimizing dose to healthy tissue. Radiation therapy planning, as currently practiced in the… more
Date: September 1, 1996
Creator: Little, R. C.; Adams, K. J.; Estes, G. P.; Hughes III, L. S. & Waters, L. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Installation guide to mpich, a portable implementation of MPI

Description: MPI (Message Passing Interface) is a standard specification for message-passing libraries. mpich is a portable implementation of the full MPI specification for a wide variety of parallel computing environments, including workstation clusters and massively parallel processors. mpich contains, along with the MPI library itself, a programming environment for working with MPI programs. The programming environment includes a portable startup mechanism, several profiling libraries for studying the pe… more
Date: July 1, 1996
Creator: Gropp, W. & Lusk, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Users guide for mpich, a portable implementation of MPI

Description: MPI (Message Passing Interface) is a standard specification for message-passing libraries. mpich is a portable implementation of the full MPI specification for a wide variety of parallel computing environments. This report describes how to build and run MPI programs using the mpich implementation of MPI.
Date: July 1, 1996
Creator: Gropp, W. & Lusk, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of the radionuclide tracer test conducted at the project Gnome Underground Nuclear Test Site, New Mexico

Description: A radionuclide tracer test was conducted in 1963 by the U.S. Geological Survey at the Project Gnome underground nuclear test site, approximately 40 km southeast of Carlsbad, New Mexico. The tracer study was carried out under the auspices of the U.S. Atomic Energy Commission (AEC) to study the transport behavior of radionuclides in fractured rock aquifers. The Culebra Dolomite was chosen for the test because it was considered to be a reasonable analogue of the fractured carbonate aquifer at the … more
Date: August 1, 1996
Creator: Pohll, G. & Pohlmann, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Treating electron transport in MCNP{sup trademark}

Description: The transport of electrons and other charged particles is fundamentally different from that of neutrons and photons. A neutron, in aluminum slowing down from 0.5 MeV to 0.0625 MeV will have about 30 collisions; a photon will have fewer than ten. An electron with the same energy loss will undergo 10{sup 5} individual interactions. This great increase in computational complexity makes a single- collision Monte Carlo approach to electron transport unfeasible for many situations of practical intere… more
Date: December 31, 1996
Creator: Hughes, H.G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Integrated Assessment of Acid Deposition Impacts Using Reduced-Form Modeling. Final Report

Description: Emissions of sulfates and other acidic pollutants from anthropogenic sources result in the deposition of these acidic pollutants on the earth`s surface, downwind of the source. These pollutants reach surface waters, including streams and lakes, and acidify them, resulting in a change in the chemical composition of the surface water. Sometimes the water chemistry is sufficiently altered so that the lake can no longer support aquatic life. This document traces the efforts by many researchers to u… more
Date: May 1, 1996
Creator: Sinha, R. & Small, M. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Radiation issues of a {mu}{sup +}{mu}{sup {minus}} collider

Description: Radiation issues of high-luminosity 2 x 2 TeV and 250 x 250 GeV {mu}{sup +}{mu}{sup -} colliders are considered. A series of dedicated simulations have been performed with the MARS code to understand formation of radiation fields in the complex and to assure that there are ways to meet the stringent regulation requirements. Considered in detail are the main collider arcs, the interaction region and absorption of spent muon beam. Prompt and residual radiation is analyzed. It is shown that for bo… more
Date: October 1, 1996
Creator: Mokhov, N.V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

MPSalsa a finite element computer program for reacting flow problems. Part 2 - user`s guide

Description: This manual describes the use of MPSalsa, an unstructured finite element (FE) code for solving chemically reacting flow problems on massively parallel computers. MPSalsa has been written to enable the rigorous modeling of the complex geometry and physics found in engineering systems that exhibit coupled fluid flow, heat transfer, mass transfer, and detailed reactions. In addition, considerable effort has been made to ensure that the code makes efficient use of the computational resources of mas… more
Date: September 1, 1996
Creator: Salinger, A.; Devine, K.; Hennigan, G. & Moffat, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Radiobiological modelling with MarCell software

Description: Jones introduced a bone marrow radiation cell kinetics model with great potential for application in the fields of health physics, radiation research, and medicine. However, until recently, only the model developers have been able to apply it because of the complex array of biological and physical assignments needed for evaluation of a particular radiation exposure protocol. The purpose of this article is to illustrate the use of MarCell (MARrow CELL Kinetics) software for MS-DOS, a user-friend… more
Date: October 1, 1996
Creator: Hasan, J.S. & Jones, T.D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of automated image co-registration techniques: Part II - multisensor imagery

Description: This is the second in a series of PNNL Multispectral Imagery (ST474D) reports on automated co-registration and rectification of multisensor imagery. In the first report, a semi-automated registration procedure was introduced based on methods proposed by Chen and Lee which emphasized registration of same sensor imagery. The Chen and Lee approach is outlined in Figure 1, and is described in detail in the first report. PNNL made several enhancements to the Chen and Lee approach; these modification… more
Date: October 1, 1996
Creator: Lundeen, T. F.; Andrews, A. K.; Perry, E. M.; Whyatt, M. V. & Steinmaus, K. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Intercomparison of low-frequency variability of the global 200 hPa circulation for AMIP simulations

Description: In the Atmospheric Model Intercomparison Project (AMIP) a number of GCMs are integrated for a 10 year period, 1979-1988, all using the same monthly mean sea surface temperature (SST). This permits a useful intercomparison of the response of the models to the imposed SST. The variables used here for the intercomparison are the 200 hPa divergence and streamfunction. The data used are in the form of monthly averages and are filtered to a spatial resolution of T10, although the actual spatial resol… more
Date: March 1, 1996
Creator: Boyle, J.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A constitutive model for representing coupled creep, fracture, and healing in rock salt

Description: The development of a constitutive model for representing inelastic flow due to coupled creep, damage, and healing in rock salt is present in this paper. This model, referred to as Multimechanism Deformation Coupled Fracture model, has been formulated by considering individual mechanisms that include dislocation creep, shear damage, tensile damage, and damage healing. Applications of the model to representing the inelastic flow and fracture behavior of WIPP salt subjected to creep, quasi-static … more
Date: March 1, 1996
Creator: Chan, K. S.; Bodner, S. R.; Munson, D. E. & Fossum, A. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Overview of MACCS and MACCS2 development efforts

Description: The MELCOR Accident Consequence Code System (MACCS), publicly distributed since 1987, was developed to estimate the potential impacts to the surrounding public of severe accidents at nuclear power plants. The principal phenomena considered in MACCS are atmospheric transport and deposition under time-variant meteorology, short-term and long-term mitigative actions and exposure pathways, deterministic and stochastic health effects, and economic costs of mitigative actions. At this time, no other … more
Date: August 1, 1996
Creator: Young, M. & Chanin, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Optimization of the LHC interaction region with respect to beam-induced energy deposition

Description: Energy deposition in the superconducting magnets by particles from p- p collisions is a significant challenge for the design of the LHC high luminosity insertions. We have studies the dependence of the energy deposition on the apertures and strengths of insertion magnets and on the placement of absorbers in front of and within the quadrupoles. Monte Carlo simulations were made using the code DTUJET to generate 7{times}7 TeV p-p events and the code MARS to follow hadronic and electromagnetic cas… more
Date: June 1, 1996
Creator: Mokhov, N.V. & Strait, J.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Activation caused by proton beam losses in Accelerator Production of Tritium LINAC

Description: A variety of accelerator designs are being considered for the Accelerator Production of Tritium (APT) project at Alamos National Laboratory. Because activation of the structural components of the accelerator is considered a major radiation protection issue, we have developed a computational methodology to estimate quantitatively radionuclide inventories and gamma dose rates resulting from accelerator operation. The work presented here illustrates the use of our computational methodology by focu… more
Date: March 1, 1996
Creator: Beard, C. A.; Eaton, S. L.; Daemen, L. L.; Waters, L. S. & Wilson, W. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

MCNP{trademark} Software Quality Assurance plan

Description: MCNP is a computer code that models the interaction of radiation with matter. MCNP is developed and maintained by the Transport Methods Group (XTM) of the Los Alamos National Laboratory (LANL). This plan describes the Software Quality Assurance (SQA) program applied to the code. The SQA program is consistent with the requirements of IEEE-730.1 and the guiding principles of ISO 900.
Date: April 1, 1996
Creator: Abhold, H.M. & Hendricks, J.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Verification of the Monte Carlo differential operator technique for MCNP{trademark}

Description: The differential operator perturbation technique has been incorporated into the Monte Carlo N-Particle transport code MCNP and will become a standard feature of future releases. This feature includes first and second order terms of the Taylor series expansion for response perturbations related to cross-section data (i.e., density, composition, etc.). Perturbation and sensitivity analyses can benefit from this technique in that predicted changes in one or more tally responses may be obtained for… more
Date: February 1, 1996
Creator: McKinney, G. W. & Iverson, J. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Alternate fluid to improve energy efficiency of supercritical water oxidation process

Description: This report discusses the replacement of water by carbon dioxide in both the quench stream and the supercritical water oxidation (SCWO) reactor feed in order to reduce the energy utilization in the process. FLUENT was used to generate the input requirements and ASPEN PLUS was used to model the SCWO process. Simulations were made for normal MODAR operating conditions (baseline case) and two other cases replacing water by carbon dioxide. The basis for and assumptions used in the simulation are gi… more
Date: March 1, 1996
Creator: Oh, C.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Monte Carlo importance sampling for the MCNP{trademark} general source

Description: Research was performed to develop an importance sampling procedure for a radiation source. The procedure was developed for the MCNP radiation transport code, but the approach itself is general and can be adapted to other Monte Carlo codes. The procedure, as adapted to MCNP, relies entirely on existing MCNP capabilities. It has been tested for very complex descriptions of a general source, in the context of the design of spent-reactor-fuel storage casks. Dramatic improvements in calculation effi… more
Date: January 9, 1996
Creator: Lichtenstein, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Monte Carlo simulation of radiation streaming from a radioactive material shipping cask

Description: Simulated detection of gamma radiation streaming from a radioactive material shipping cask have been performed with the Monte Carlo codes MCNP4A and MORSE-SGC/S. Despite inherent difficulties in simulating deep penetration of radiation and streaming, the simulations have yielded results that agree within one order of magnitude with the radiation survey data, with reasonable statistics. These simulations have also provided insight into modeling radiation detection, notably on location and orient… more
Date: April 1, 1996
Creator: Liu, Y. Y.; Schwarz, R. A. & Tang, J. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Discrete optimization of isolator locations for vibration isolation systems: An analytical and experimental investigation

Description: An analytical and experimental study is conducted to investigate the effect of isolator locations on the effectiveness of vibration isolation systems. The study uses isolators with fixed properties and evaluates potential improvements to the isolation system that can be achieved by optimizing isolator locations. Because the available locations for the isolators are discrete in this application, a Genetic Algorithm (GA) is used as the optimization method. The system is modeled in MATLAB{trademar… more
Date: May 17, 1996
Creator: Ponslet, E.R. & Eldred, M.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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