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in subjects: "Geometry"

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TFTR coil case design

The TFTR (TOKAMAK Fusion Test Reactor) TF (Toroidal Field) coil cases are highly loaded structures designed within severe constraints. Foremost among these are basic machine geometry, material characteristics of both the case and the copper/epoxy matrix it supports, and overall cost. Scoping and parametric studies have been performed continuously since conceptual design. The progression of design decisions including coil shape, support locations and their stiffnesses, material selection, and el… more

Date: January 1, 1977

Creator: Pusateri, J.; Barnes, G. & Citrolo, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Static and dynamic analyses on the MFTF-B vacuum vessel. Revision 1

The Mirror Fusion Test Facility is a major magnetic fusion energy project at the Lawrence Livermore National Laboratory. An important component of this facility is the vacuum vessel, which forms the vacuum chamber. The vessel is supported on twenty-two pairs of legs that rest on reinforced concrete piers. In performing static and dynamic analyses on the vacuum vessel, we separately investigated the load distribution under gravity loads, pressure loads, electromagnetic loads, and thermal loads. … more

Date: January 15, 1984

Creator: Ng, D.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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CGVIEW: A program to generate isometric and perspective views of combinatorial geometries

The prototype of a graphical debugger for combinatorial geometry (CG) is described. The prototype debugger consists of two parts: a FORTRAN-based view'' generator and a Microsoft Windows application for displaying the geometry. This document describes the code CGVIEW, which comprises the first part of the system. User-specified options permit the selection of an arbitrary viewpoint in space and the generation of either an isometric or perspective view. Additionally, any combination of zones, ma… more

Date: July 1, 1992

Creator: Burns, T.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The geometry of the Virasoro group for physicists

Diff(S/sup 1/), the group of reparametrizations of the circle, is known as the Virasoro group in string theory. Reparametrizations keeping fixed a point of the circle form the quotient space Diff(S/sup 1/)S/sup 1/. The geometry of this space is relevant for string theory and string field theory. We describe this space as an infinite dimensional complex manifold with a Kaehler metric and compute ist Riemann tensor and its Ricci tensor. 7 refs

Date: November 1, 1987

Creator: Zumino, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Excited state electron spin coherence (ESESC) studies of triplet states in molecular solids

The field of coherent spectroscopy of two-level systems is applied to the lowest triplet state of organic molecules. By neglecting the triplet sublevel not coupled by the field, it is possible to describe the remaining two levels with Feynman-Vernon-Hellwarth geometrical representation of a general two-level system. The equations of motion of the pseudomagnetization are derived after transformation to the rotating frame, as are Bloch-type equations which include phenomenological relaxation time… more

Date: February 1, 1978

Creator: Tarrasch, M.E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Central receiver solar thermal power system. Phase 1. CDRL item 2; Pilot Plant preliminary design report. Volume II. System decription and system analysis

An active system analysis and integration effort has been maintained. These activities have included the transformation of initial program requirements into a preliminary system design, the evolution of subsystem requirements which lay the foundation for subsystem design and test activity, and the overseeing of the final preliminary design effort to ensure that the subsystems are operationally compatible and capable of producing electricity at the lowest possible cost per unit of energy. Volume… more

Date: October 1, 1977

Creator: Hallet, Jr., R. W. & Gervais, R. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Numerical methods for laser fusion

The LASNEX computer code was developed to study the many interrelated physical processes important in the effort to achieve laser initiated fusion. It has been used to calculate the results of numerous laser plasma experiments and to design targets and determine desirable laser pulse characteristics for future experiments. Some processes, such as hydrodynamics, are well formulated in fundamental equations and can be solved with high accuracy by sophisticated numerical methods. Other processes, … more

Date: November 3, 1977

Creator: Zimmerman, G.B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

BRUTE

BRUTE is an algorithm to derive the implied boundary of a piecepart from the part's wireframe representation. BRUTE's input is an IGES file. The geometry is extracted and used to derive the edge-vertex (EV) topology. BRUTE then uses a divide-and-conquer method to derive all reasonable face-edge-vertex (FEV) topologies from the EV topology. The final step is to determine the geometry of each face by using the geometry of its edges. Any FEV topology that contains a face that is not a valid surfac… more

Date: May 1, 1982

Creator: Christensen, N.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Stimulation model for lenticular sands: Volume 2, Users manual

This User's Manual contains information for four fracture/proppant models. TUPROP1 contains a Geertsma and de Klerk type fracture model. The section of the program utilizing the proppant fracture geometry data from the pseudo three-dimensional highly elongated fracture model is called TUPROPC. The analogous proppant section of the program that was modified to accept fracture shape data from SA3DFRAC is called TUPROPS. TUPROPS also includes fracture closure. Finally there is the penny fracture a… more

Date: July 1, 1987

Creator: Rybicki, E.F.; Luiskutty, C.T.; Sutrick, J.S.; Palmer, I.D.; Shah, G.H. & Tomutsa, L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Plasma-Induced Conversion of Surface-Adsorbed Hydrocarbons

Experimental results are reported for an electrical device for direct conversion of methane into higher hydrocarbons. A microchannel plate is excited with electrons from a photoemissive source, and electron impact ionization of methane on the inner surfaces of the microchannels creates an ion feedback process. The resulting low-density plasma creates higher hydrocarbons when charged particles impact the surfaces at grazing incidence. The production Of C{sub 2} to C{sub 8}-containing gases was n… more

Date: January 1, 1992

Creator: Sackinger, W. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High resolution seismic survey of the Hanna, Wyoming underground coal gasification area

In November 1980 a high resolution seismic survey was conducted at the Department of Energy, Laramie Energy Technology Center's underground coal gasification test site near Hanna, Wyoming. The objectives of the survey were to determine the feasibility of utilizing high resolution seismic technology to locate and characterize underground coal burn zones and to identify shallow geologic faults at the test site. Seismic data acquisition and processing parameters were specifically designed to empha… more

Date: January 1, 1982

Creator: Youngberg, A.D.; Berkman, E. & Orange, A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Construction of relativistic quantum theory: a progress report

We construct the particulate states of quantum physics using a recursive computer program that incorporates non-determinism by means of locally arbitrary choices. Quantum numbers and coupling constants arise from the construction via the unique 4-level combinatorial hierarchy. The construction defines indivisible quantum events with the requisite supraluminal correlations, yet does not allow supraluminal communication. Measurement criteria incorporate c, h-bar and m/sub p/ or (not ''and'') G, c… more

Date: June 1, 1986

Creator: Noyes, H. Pierre

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Hydraulic fracture design optimization

This research and development investigation, sponsored by US DOE and the oil and gas industry, extends previously developed hydraulic fracture geometry models and applied energy related characteristic time concepts towards the optimal design and control of hydraulic fracture geometries. The primary objective of this program is to develop rational criteria, by examining the associated energy rate components during the hydraulic fracture evolution, for the formulation of stimulation treatment des… more

Date: January 1, 1992

Creator: Lee, Tae-Soo & Advani, S. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High energy hadron--hadron collisions. Annual progress report. [Summaries of research activities at the University of Georgia]

Work on high energy hadron collisions in the geometrical picture, performed under the ERDA Contract No. E(38-1)-946, is summarized. Comparisons with new experimental results are made. Specific items discussed include the hadronic matter distribution for mesons and the comparison of theoretical prediction with a recent experiment, the possible existence of a second minimum in elastic pp scattering at very high energies, the analysis of the energy dependence of opaqueness in pp collisions, and th… more

Date: October 1, 1977

Creator: Chou, T.T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Thermal-hydraulic and structural considerations on the gap variation between fuel bundle and hexcan

One of the safety concerns in reactor operation is the temperature of the fuel elements, which are contained in a hexagonal duct, referred to as the hexcan. There are gaps between the fuel bundle and the hexcan, and the gaps somewhat affect thermal-hydraulic behavior of the fuel element. This paper investigates the impact of gap variations on the thermal-hydraulic responses of the fuel element as well as the possibility of fuel bundle and hexcan interaction. The gap variation between hex duct a… more

Date: January 1, 1992

Creator: Chang, L. K.; Lee, M. J. & Ku, J. Y.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Strain distribution and model for formation of eastern Umtanum Ridge anticline, south-central Washington

Umtanum Ridge in south-central Washington is the topographic expression of a complex anticline within the Yakima Fold system in the Miocene Columbia River Basalt Group. The Yakima Fold system, which is partly contained within the Hanford Site, is an example of a layered basalt sequence folded near the surface of the earth. The Pasco Basin stratigraphic nomenclature is used in this repot. Rockwelll Hanford Operations, under contract to the US Department of Energy, is investigating the feasibilit… more

Date: October 1, 1979

Creator: Price, E.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Super magnets for interaction regions

The feasibility of using superconducting magnets in the beam interaction regions of particle accelerators is discussed. These higher field magnets can be shorter, leaving more room for detectors, but also must have a large aperture and magnetic shielding. The ''kissing geometry'' was investigated, and design and scaling considerations are given. A rough estimate of the cost of such superconducting magnets is given as an aid to the selection of interaction geometry. (PMA)

Date: January 1, 1977

Creator: Biallas, G.; Fowler, W. & Diebold, R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Heat transfer research and power cycle transient modeling

Fine axial flutes enhance heat transfer in vertical shell-and-tube exchangers with water inside the tubes and ammonia evaporating or condensing in layer flow on the shell side. Single-tube experiments with R-11 and ammonia indicate local shell-side coefficients 3 to 5 times those for corresponding smooth tubes. Single-tube experiments with water indicate that at moderate velocities the tube-side coefficients are enhanced by a factor equal to the ratio of fluted-to-smooth surface areas while the… more

Date: March 23, 1977

Creator: Rothfus, R.R. & Neuman, C.P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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HELIOS: a computational model for solar concentrators

The HELIOS computer code calculates the power concentrated by a field of individually guided heliostats and the resulting flux density (watts/cm/sup 2/) falling upon an arbitrary target grid. The problem has individual subroutines for each task in order to incorporate options for a variety of facet shapes, heliostat designs, field layouts, and tower-receiver apertures, and to facilitate additions and code improvements. HELIOS has been used extensively to analyze questions on safety, performance… more

Date: unknown

Creator: Biggs, F. & Vittitoe, C. N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Streak camera techniques

An introduction to streak camera geometry, experimental techniques, and limitations are presented. Equations, graphs and charts are included to provide useful data for optimizing the associated optics to suit each experiment. A simulated analysis is performed on simultaneity and velocity measurements. An error analysis is also performed for these measurements utilizing the Monte Carlo method to simulate the distribution of uncertainties associated with simultaneity-time measurements.

Date: June 1, 1977

Creator: Avara, R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Present capabilities and new developments in antenna modeling with the numerical electromagnetics code NEC

Computer modeling of antennas, since its start in the late 1960's, has become a powerful and widely used tool for antenna design. Computer codes have been developed based on the Method-of-Moments, Geometrical Theory of Diffraction, or integration of Maxwell's equations. Of such tools, the Numerical Electromagnetics Code-Method of Moments (NEC) has become one of the most widely used codes for modeling resonant sized antennas. There are several reasons for this including the systematic updating a… more

Date: April 8, 1988

Creator: Burke, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Quadric solids and computational geometry

As part of the CAD-CAM development project, this report discusses the mathematics underlying the program QUADRIC, which does computations on objects modeled as Boolean combinations of quadric half-spaces. Topics considered include projective space, quadric surfaces, polars, affine transformations, the construction of solids, shaded image, the inertia tensor, moments, volume, surface integrals, Monte Carlo integration, and stratified sampling. 1 figure.

Date: July 25, 1980

Creator: Emery, J.D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Status of Monte Carlo at Los Alamos

Four papers were presented by Group X-6 on April 22, 1980, at the Oak Ridge Radiation Shielding Information Center (RSIC) Seminar-Workshop on Theory and Applications of Monte Carlo Methods. These papers are combined into one report for convenience and because they are related to each other. The first paper (by Thompson and Cashwell) is a general survey about X-6 and MCNP and is an introduction to the other three papers. It can also serve as a resume of X-6. The second paper (by Godfrey) explain… more

Date: May 1, 1980

Creator: Thompson, W. L.; Cashwell, E. D.; Godfrey, T. N. K.; Schrandt, R. G.; Deutsch, O. L. & Booth, T. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Overview of CSEWG shielding benchmark problems

The fundamental philosophy behind the choosing of CSEWG shielding benchmarks is that the accuracy of a certain range of cross section data be adequately tested. The benchmarks, therefore, consist of measurements and calculations of these measurements. Calculations for which there are no measurements provide little information on the adequacy of the data, although they can perhaps indicate the sensitivity of results to variations in data.

Date: January 1, 1979

Creator: Maerker, R.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department