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Now showing items 1-10 of 56

#### Localized energy pulse trains launched from an open, semi-infinite, circular waveguide

(American Institute of Physics, 1989-01-15)

A new decomposition of exact solutions to the scalar wave equation into bidirectional, backward and forward traveling plane waves is described. These elementary blocks constitute a natural basis for synthesizing Brittinghamlike ...

#### Dynamic response of cross-ply laminated shallow shells according to a refined shear deformation theory

(Acoustical Society of America, 1989-06-01)

The dynamic response of cross-ply laminated shallow shells is investigated using the third-order shear deformation shell theory of Reddy [J. Appl. Mech. 4 1, 47 (1984)]. The theory accounts for cubic variation of the ...

#### Comparison Of The Measured And Predicted Response Of The Earth Radiation Budget Experiment Active Cavity Radiometer During Solar Observations

(Optical Society of America, 1989-05-01)

The Earth Radiation Budget Experiment consists of an array of radiometric instruments placed in earth orbit by the National Aeronautics and Space Administration to monitor the longwave and visible components of the earth's ...

#### Fabrication Of Holographic Gratings Using A Moving Point-Source

(Optical Society of America, 1989-02-01)

In the manufacture of holographic gratings using coherent light there is an associated problem of optical noise, the conventional remedies for which involve various restrictions. In this work a moving point source is adopted ...

#### Grating Speckle Method For In-Plane Displacement Measurement

(Optical Society of America, 1989-12-01)

A high sensitivity technique combining lensless speckle photography and a grid technique is proposed and demonstrated. A high frequency grid is applied to the specimen surface and contact specklegrams are made in white ...

#### Grain-boundary ordering, segregation, and melting transitions in a two-dimensional lattice-gas model

(American Physical Society, 1989-06-01)

A two-dimensional lattice-gas model of a binary-ordering-alloy system was used to study the phase transitions and the atomic configuration near a Σ=5 grain boundary. The cluster variation method was used to study order-disorder ...

#### Gaussian decomposition of beams and other functions

(American Institute of Physics, 1989-06-15)

The Gabor expansion of a function f_(x) decomposes it into a double sum over integers m and n of a product of basis functions g(x_m X) and Fourier_series exponentials exp(2πi n/X) for given spacing X. The choice of basis ...

#### A Bidirectional Traveling Plane-Wave Representation Of Exact-Solutions Of The Scalar Wave-Equation

(AIP Publishing, 1989-06-01)

A new decomposition of exact solutions to the scalar wave equation into bidirectional, forward and backward, traveling plane wave solutions is described. The resulting representation is a natural basis for synthesizing ...

#### Global Optimization for Polynomial Programming Problems Usingm-homogeneous Polynomial Homotopies

(Department of Computer Science, Virginia Polytechnic Institute & State University, 1989), TR-89-31

A polynomial programming problem is a nonlinear programming problem where the objective function, inequality constraints, and equality constraints all consist of polynomial functions. The necessary optimality conditions ...

#### Documentation Production under Next Generation Technologies

(Department of Computer Science, Virginia Polytechnic Institute & State University, 1989), TR-89-13

This report describes the development of the Abstraction Refinement Model as a basis for linking the development and maintenance tasks in software systems. Documentation is critical in both efforts, and the reliance on ...