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Now showing items 1-10 of 86

#### Tunable spatial-filtering with a Fabry-Perot etalon

(Optical Society of America, 1980-08)

A Fabry-Perot etalon is used in the image plane as a means of selecting arbitrary directions of propagation in the angular spectrum of an object. This provides a simple widely tunable spatial filter that could be useful ...

#### Convergent methods for calculating thermodynamic Green functions

(American Physical Society, 1984-08)

A convergent method of approximating thermodynamic Green functions is outlined briefly. The method constructs a sequence of approximants which converges independently of the strength of the Hamiltonian's coupling constants. ...

#### Rotational matched spatial filter for biological pattern recognition

(Optical Society of America, 1980-06)

Randomly oriented microbiological patterns are recognized by rotating a matched spatial filter with an optical wedge prism. The filter is made from a composite input pattern with various sized objects to cover wider ranges ...

#### Analytic theory for the selection of a two-dimensional needle crystal at arbitrary Péclet number

(American Physical Society, 1989-10)

An accurate analytic theory is presented for the velocity selection of a two-dimensional needle crystal for arbitrary Péclet number for small values of the surface-tension parameter. The velocity selection is caused by the ...

#### Diffusion of muonic atoms

(American Physical Society, 1988-10)

Transport of muonic hydrogen and deuterium atoms in gaseous hydrogen and deuterium is studied in the diffusion approximation and by means of the multiple-collision expansion. The diffusion coefficient is derived. Numerical ...

#### High-resolution time-of-flight mass spectrometry impulse-field focusing pulse generators

(AIP Publishing, 1986-08)

Experiments have shown that the unit mass resolution of conventional Wiley-McLaren time_of_flight (TOF)mass spectrometers can be significantly improved using the technique of impulse_field focusing (IFF). Details of the ...

#### Exact behavior of Jost functions at low energy

(AIP Publishing, 1988-01)

For Schrödinger operators with central potential q(r) and angular momentuml, the behavior of the Jost function F l (k) as k→0 is investigated. It is assumed that ∫∞ 0 d r (1+r)σ‖q(r)‖<∞, where σ≥1. Situations where q is ...

#### Viscosity and density stratification in vertical Poiseuille flow

(AIP Publishing, 1987-06)

The linear stability of plane three_layer vertical Poiseuille flow is considered. The layers are composed of two immiscible fluids, one next to the walls and one centrally located. The fluids have different viscosities and ...

#### Couette flow of a binary gas mixture

(AIP Publishing, 1988-03)

The linearized binary model described by Hamel [Phys. Fluids 8, 418 (1964)] is used to obtain a set of kinetic equations and boundary conditions for the Couette flow problem. The derived set of two coupled integrodifferential ...

#### k-space function spaces

(Hindawi, 1980-01-01)

A study is made of the properties on X which characterize when Cπ(X) is a k-space, where Cπ(X) is the space of real-valued continuous functions on X having the topology of pointwise convergence. Other properties related ...