Bibliography of Lewis Research Center technical publications announced in 1986

This compilation of abstracts describes and indexes the technical reporting that resulted from the scientific and engineering work performed and managed by the Lewis Research Center in 1986. All the publications were announced in the 1986 issues of Scientific and Technical Aerospace Reports (STAR) and/or International Aerospace Abstracts (IAA). Included are research reports, journal articles, conference presentations, patents and patent applications, and theses

MS FT-2-2 7 Orthogonal polynomials and quadrature: Theory, computation, and applications

Quadrature rules find many applications in science and engineering. Their analysis is a classical area of applied mathematics and continues to attract considerable attention. This seminar brings together speakers with expertise in a large variety of quadrature rules. It is the aim of the seminar to provide an overview of recent developments in the analysis of quadrature rules. The computation of error estimates and novel applications also are described

Modelling of transport in highly heterogeneous porous media, with application to the flushing of waste.

This thesis is concerned with predicting the fate of contaminants using tracer and contaminant flushing datasets in otherwise poorly characterised heterogeneous media. A deductive approach towards constraining prediction uncertainty is adopted, by narrowing a 'pool' of plausible process models and associated parameter sets. Mathematical comparison of simple transport models is used to allow enhanced diagnosis. Transport models are put into a framework. Then they are compared using commonly used measures of breakthrough curves (least squares fitting, method of moments and late-time concentration gradients). Experimental data and models for transport in waste are then reviewed using this framework. Two new tracer datasets, at laboratory and lysimeter scales, are analysed and modelled. Strong evidence is shown of 'dual-porosity' diffusive exchange effects being an important component in transport in municipal solid waste. However, it is not possible to discriminate between contributions to dispersion through advective and diffusive effects. Approaches to enhance the diagnostic capability of future waste experiments are developed. One possible 'entrant' to the 'pool' of models is examined: a stochastic channel network model. Histograms of nodes and average heads are evaluated at different distances from a range of boundary conditions for large ensembles revealing key insights into network flow behaviour near different types of boundary. Key properties of the network are related to typical continuum analyses, including dimensionality of flow and genesis of apparent 'skins' near boundaries. 'Classical' percolation networks (with zero spatial correlation) are also analysed, revealing new insights into their network properties within finite boundaries. In summary, progress towards predicting the fate of contaminants in highly heterogeneous systems is made through a thorough delineation of the behaviour of simple models in tandem with adoption of a fertile approach to adding new conceptual models. The increased rigorousness of using multiple diagnostic criteria in conjunction with adopting a philosophy of working with multiple working hypotheses is commended as a methodology that provides a sound basis from which to employ multiple-model uncertainty analysis for predictive purposes in the future

Energy: A special bibliography with indexes, April 1974

This literature survey of special energy and energy related documents lists 1708 reports, articles, and other documents introduced into the NASA scientific and technical information system between January 1, 1968, and December 31, 1973. Citations from International Aerospace Abstracts (IAA) and Scientific and Technical Aerospace Reports (STAR) are grouped according to the following subject categories: energy systems; solar energy; primary energy sources; secondary energy sources; energy conversion; energy transport, transmission, and distribution; and energy storage. The index section includes the subject, personal author, corporate source, contract, report, and accession indexes