Download or read book Low Frequency Scattering written by George Dassios and published by Oxford University Press. This book was released on 2000 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scattering theory deals with the interactions of waves with obstacles in their path, and low frequency scattering occurs when the obstacles involved are very small. This book gives an overview of the subject for graduates and researchers, for the first time unifying the theories covering acoustic, electromagnetic and elastic waves.

Download or read book Automated String Support System for Low Frequency Scattering Measurements written by Timothy H. Shively and published by . This book was released on 1997 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book LOW FREQUENCY SCATTERING BY SPHEROID AND DISCS written by J.S. ASVESTAS AND R.E. KLEINMAN and published by . This book was released on 1967 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Low Frequency Scattering from Two Dimensional Perfect Conductors written by Thorkild B. Hansen and published by . This book was released on 1991 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exact expressions are obtained for the leading terms in the low- frequency expansions of the far field scattered by an arbitrarily shaped cylinder with finite cross section, an arbitrarily shaped cylindrical bump on a ground plane, and an arbitrarily shaped cylindrical dent in a ground plane. By inserting the low-frequency expansions of the incident plane wave and Green's function into exact integral equations for the surface current, integral equations are obtained for the leading terms in the low-frequency expansions of the surf ace current. Simple integrations of these leading terms of the current expansion yield the leading terms in the low-frequency expansions of the scattered fields. For the cylinder with finite cross section, the leading term in the low-frequency expansion of the TM scattered far field is explicitly given by an expression that is independent of the shape of the cylinder. The explicit expression for the low-frequency TE scattered far field contains three constants that depend only on the shape of the cylinder. These three constants are found from the solutions to two electrostatic problems. The explicit expressions for the low-frequency diffracted fields of a bump or dent contain one constant that depends only on the shape of the bump or dent. Remarkably, this single constant is the same for both TM and TE polarization and can be found from the solution to either an electrostatic or magnetostatic problem. The general low-frequency expressions are confirmed by comparing them to low-frequency results obtained from exact time-harmonic eigenfunction solutions, and constants an evaluated for a number of geometries. Low-Frequency scattering, Static problems, Two- dimensional perfect conductors, Integral equations.

Download or read book low frequency scattering from an ogive written by ergun ar and published by . This book was released on 1965 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Low Frequency Scattering by Passive Periodic Structures for Oblique Incidence written by and published by . This book was released on 2008 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Low Frequency Scattering by Imperfectly Conducting Obstacles written by John S. Asvestas and published by . This book was released on 1972 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four coupled Fredholm integral equations of the second kind are derived for the electric and magnetic fields interior and exterior to a smooth, bounded, closed, three dimensional scatterer of permittivity, permeability, and non-zero finite conductivity, when the scatterer is illuminated by a time harmonic, monochromatic, otherwise arbitrary field. The surrounding medium has the properties of vacuum. The kernels of these equations are dyadics constructed from potential functions associated with the scattering surface. If the frequency of the incident field is sufficiently small, the integral equations may be solved in a standard Neumann series. (Author).

Download or read book Low Frequency Scattering by Mixtures of Correlated Nonspherical Particles written by Victor Twersky and published by . This book was released on 1988 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earlier results for scattering by correlated distributions of randomly oriented particles (with minimum separation small compared to wavelength, and acoustic particle parameters close to the embedding medium's) are generalized to mixtures of similarly shaped but differently sized particles. The development for these large-scale fluids is based on scaled particle statistical mechanics for mixtures of convex particles (with nonsphericity parameter c). The scattering depends on fluctuation (S) in number concentration, and simple forms of S in terms of the volume fraction (w) are derived for multicomponent mixtures and continuum analogs. Continuous size distributions governed by Posisson probability functions whose skewness depends on the variance (d) lead to simple two-parameter fluctuation functions S(c, d;w). The original discussion of the one-component case (d = o) emphasized the influence of c on the curve peak and its location in w; the primary effects of d are to increase the values of both, and to reduce the fall off of S with increasing w (increasing packing). (RH).

Download or read book Low Frequency Scattering by Spheroids and Discs written by John S. Asvestas and published by . This book was released on with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Low Frequency Electromagnetic Scattering written by Jisoo Ryu and published by . This book was released on 1971 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Low frequency electromagnetic scattering written by Habib Ammari and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Numerical Solution of Low Frequency Scattering Problems written by Thomas B. A. Senior and published by . This book was released on with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Low Frequency Acoustic and Electromagnetic Scattering written by S. I. Hariharan and published by . This book was released on 1983 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This paper deals with two classes of problems arising from acoustics and electromagnetics scattering in the low frequency situations. The first class of problem is solving Helmholtz equation with Dirichlet boundary conditions on an arbitrary two-dimensional body while the second one is an interior-exterior interface problem with Helmholtz equation in the exterior. Low frequency analysis show that there are two intermediate problems which solve the above problems accurate to 0(k^2 log k) where k is the frequency. These solutions greatly differ from the zero frequency approximations. For the Dirichlet problem numerical examples are shown to verify our theoretical estimates" -- abstract.

Download or read book The Numerical Solution of Low Frequency Scattering Problems written by and published by . This book was released on 1972 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: The low frequency scattering of electromagnetic and acoustic waves by rotationally symmetric bodies is considered. By concentrating on certain quantities such as the normalised component of the induced electric and magnetic dipole moments, it is shown how the first one or two terms in the far zone scattered fields can be expressed in terms of quantities which are functions only of the geometry of the body. Each of these is the weighted integral of an elementary potential function which can be found by solving an integral equation. A computer program has been written to solve the appropriate equations by the moment method, and for calculating the dipole moments, the electrostatic capacity, and a further quantity related to the capacity. The program is described and related data are presented.

Download or read book Numberical Results for Low Frequency Scattering by Elliptic Cylinders and Isolated Semi Elliptic Protuberances written by and published by . This book was released on 1962 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: The low-frequency approximations ('closed form' and series) derived previously for the fields scattered by elliptic cylinders, and by semi-elliptic protuberances, are applied numerically. For the two cases, E or H parallel to the generators, the results presented include total scattering cross sections, forward and back scattered intensity and phase curves, and far field scattering patterns; for various angles of incidence, various eccentricities, and for various values of Ra equal to or less than 1.1 (where R 2 pi/lambda and 2a is the major axis of the scatterers). Attention is restricted to the low-frequency range not covered by published tables of Mathieu functions.

Download or read book Low Frequency Scattering by Correlated Distributions of Randomly Oriented Particles written by Victor Twersky and published by . This book was released on 1987 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Random distributions of correlated scatterers averaged over orientation are considered, corresponding to isotropic fluids of statistical mechanics particles (with volume v, number concentration p, and volume fraction w = pv). For minimum separation of centers small compared to wavelength and acoustic particle parameters close to the embedding medium's, the incoherent differential scattering from unit volume and the corresponding attenuation coefficient are proportional to the fluctuations (variance) in number concentration. For arbitrary convex hard particles (e.g., ovals or simple polyhedra, repulsive at contact) with shape parameter c> or = 3, the variance is expressed in terms of a quotient S(c;w) of polynomials in w that has a maximum S1 (c) at w1 (c). Spheres (c = 3) were considered earlier. For c> 3, the fluctuations and S1 and w1 are smaller than for spheres; for c

Download or read book General Formulae for the Low frequency Acoustic Scattering by a Soft Body Or Disk written by Federico J. Sabina and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: