摘要:

A new approach for specifying structural information in volume holography, using a grating vector uncertainty relation and a modified Ewald's construction, is proposed and the optimization of the Shannon number of an image is given.

ISSN:0030-3909    

DOI:10.1080/713820414

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

By using the discrete cell model for the rough surface of objects, a general expression is derived which gives the probability density function of speckle intensity produced by weak diffusers having an arbitrary phase distribution and an arbitrary cell number,N, of contributions for the formation of speckles. In some special cases, it gives the probability density functions which have been previously derived and are well known in the statistics of speckles. In the case of the small numberN= 2, an analytical solution of the probability density function is obtained from that general expression. Some features on the probability density functions of speckles are discussed for the case of small roughness and small numberN.

ISSN:0030-3909    

DOI:10.1080/713820405

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

An absorbing body is assumed to absorb the fraction α of any radiation falling on it, independent of the angle of incidence, and to reflect the remaining fraction, 1 − α, diffusely. The body is partly surrounded by a perfectly (but not necessarily specularly) reflecting cavity. An aperture admits uniform fully diffuse radiation to the cavity. The whole system is assumed to be cylindrical, i.e. to be invariant under translation in the direction of a cylinder axis. An upper bound on the efficiency of absorption, previously obtained by O'Gallagher and others, is confirmed by another argument. The upper bound is α/(α+ (1 − α)C) whereCis the ratio of aperture to absorber area.

ISSN:0030-3909    

DOI:10.1080/713820401

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

The scattering of electromagnetic waves by dielectric cylinders and, in particular, by optical fibres is studied through integral equations. The convergence of the iterations of the integral equations is established under certain conditions. The latter are satisfied for long wavelengths, and for optical fibres and wavelengths, when the dielectric permeability variation is rather small. An approximate eikonal solution is applied to optical fibres, and its reliability is discussed. A systematic procedure for estimating corrections to the eikonal approximation is proposed.

ISSN:0030-3909    

DOI:10.1080/713820413

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

The chain model with nearest neighbour and next to nearest neighbour linear interactions is used for the study of scattering properties of linear polymers. The spectral density for such polymers is obtained and numerical results pertaining to data for F-Actin compare favourably with corresponding experimental curves. The analysis employed isab initionon-equilibrium statistical mechanical and proceeds via functional integration.

ISSN:0030-3909    

DOI:10.1080/713820407

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor