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Fractal geometry of two-dimensional fracture networks at Yucca Mountain, southwestern Nevada: proceedings

Description: Fracture traces exposed on three 214- to 260-m{sup 2} pavements in the same Miocene ash-flow tuff at Yucca Mountain, southwestern Nevada, have been mapped at a scale of 1:50. The maps are two-dimensional sections through the three-dimensional network of strata-bound fractures. All fractures with trace lengths greater than 0.20 m were mapped. The distribution of fracture-trace lengths is log-normal. The fractures do not exhibit well-defined sets based on orientation. Since fractal characterizati… more
Date: December 31, 1985
Creator: Barton, C.C. & Larsen, E.
Partner: UNT Libraries Government Documents Department
open access

Introduction to combinatorial geometry

Description: The combinatorial geometry package as used in many three-dimensional multimedia Monte Carlo radiation transport codes, such as HETC, MORSE, and EGS, is becoming the preferred way to describe simple and complicated systems. Just about any system can be modeled using the package with relatively few input statements. This can be contrasted against the older style geometry packages in which the required input statements could be large even for relatively simple systems. However, with advancements c… more
Date: January 1, 1985
Creator: Gabriel, T.A. & Emmett, M.B.
Partner: UNT Libraries Government Documents Department
open access

Seismic response of LMFBR tanks with imperfections

Description: This paper deals with seismic responses of imperfect circular tanks. Physical imperfection due to manufacturing tolerances and numerical imperfection due to finite element spatial discretization are described. Numerical imperfections produced by 4-node and 9-node Lagrangian shell elements are examined. A convergence study is performed in which the number of the shell elements required to capture the dominant ''out-of-roundness'' modes under seismic excitations is determined. The response of a s… more
Date: January 1, 1985
Creator: Gvildys, J.; Ma, D.C. & Chang, Y.W.
Partner: UNT Libraries Government Documents Department
open access

Trip Report-Visit to CERN July 5 to August 5, 1985

Description: The present visit to CERN was as a result of an invitation from Dr. Colin Johnson of the Antiproton Accumulator (AA) group. Two activities were planned for this visit. First, the second beam test of one of the original Fermilab lithium lenses (serial No.2). Second, the installation and beam tests for a new Fermilab lens of improved design (serial No.5). It should be mentioned here that CERN, after realizing the possible gains to be obtained, has started a considerable development effort in shor… more
Date: September 13, 1985
Creator: Hogvat, C.
Partner: UNT Libraries Government Documents Department
open access

Geometry-independent approach to coarse-mesh neutron diffusion calculations

Description: Powerful coarse-mesh and nodal methods have been recently developed to calculate accurate node-average fluxes and eigenvalues. The nodal methods solve for the node-average flux by reducing the multidimensional diffusion problem to a coupled system of 1-D equations. These schemes are mainly limited to rectangular (xyz) nodes and cannot easily be extended to other geometries. The polynomial-based coarse-mesh methods have been applied to thetaRZ and HEXZ geometries. This summary describes the deve… more
Date: June 1, 1985
Creator: Kohut, P.
Partner: UNT Libraries Government Documents Department
open access

New slab geometry radiation transport differencing scheme

Description: Considerable effort has been directed toward seeking an optimal spatial differencing scheme for the neutron transport equation. This search led to a best scheme (using specific criteria to define ''best''): the linear characteristic method. However, we have recently considered radiative transfer problems in which the same problem may have both optically thick and optically thin regions, with the maximum optical thicknesses being much greater than those generally encountered in neutron transport… more
Date: January 1, 1985
Creator: Larsen, E.W.; Morel, J.E. & Miller, W.F. Jr.
Partner: UNT Libraries Government Documents Department
open access

A feasibility study for the spherical torus experiment

Description: Oak Ridge National Laboratory (ORNL) proposes to build the Spherical Torus Experiment (STX), a very low aspect ratio toroidal confinement device. This proposal concentrates on tokamak operation of the experiment; however, it can in principle be operated as a pinch or reversed-field pinch as well. As a tokamak, the spherical torus confines a plasma that is characterized by high toroidal beta, low poloidal beta, large natural elongation, high plasma current for a given edge q, and strong paramagn… more
Date: October 1, 1985
Creator: Lazarus, E & Peng, Yueng Kay Martin
Partner: UNT Libraries Government Documents Department
open access

Geometric perturbation theory and plasma physics

Description: Modern differential geometric techniques are used to unify the physical asymptotics underlying mechanics, wave theory and statistical mechanics. The approach gives new insights into the structure of physical theories and is suited to the needs of modern large-scale computer simulation and symbol manipulation systems. A coordinate-free formulation of non-singular perturbation theory is given, from which a new Hamiltonian perturbation structure is derived and related to the unperturbed structure.… more
Date: April 4, 1985
Creator: Omohundro, S.M.
Partner: UNT Libraries Government Documents Department
open access

SABRINA: an interactive solid geometry modeling program for Monte Carlo

Description: SABRINA is a fully interactive three-dimensional geometry modeling program for MCNP. In SABRINA, a user interactively constructs either body geometry, or surface geometry models, and interactively debugs spatial descriptions for the resulting objects. This enhanced capability significantly reduces the effort in constructing and debugging complicated three-dimensional geometry models for Monte Carlo Analysis.
Date: January 1, 1985
Creator: West, J.T.
Partner: UNT Libraries Government Documents Department
open access

Influence of Geometry on Natural Convection in Buildings

Description: Strong free convection airflows occur within passive solar buildings resulting from elevated temperatures of surfaces irradiated by solar energy compared with the cooler surfaces not receiving radiation. The geometry of a building has a large influence on the directions and magnitudes of natural airflows, and thus heat transfer between zones. This investigation has utilized a variety of reduced-scale building configurations to study the effects of geometry on natural convection heat transfer. S… more
Date: January 1, 1985
Creator: White, M. D.; Winn, C. B.; Jones, G. F. & Balcomb, J. D.
Partner: UNT Libraries Government Documents Department
open access

Torsion and geometrostasis in covariant superstrings

Description: The covariant action for freely propagating heterotic superstrings consists of a metric and a torsion term with a special relative strength. It is shown that the strength for which torsion flattens the underlying 10-dimensional superspace geometry is precisely that which yields free oscillators on the light cone. This is in complete analogy with the geometrostasis of two-dimensional sigma-models with Wess-Zumino interactions. 13 refs.
Date: January 1, 1985
Creator: Zachos, C.
Partner: UNT Libraries Government Documents Department
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