The Institute of Physics ( IOP ) по журналам "Inverse Problems"
Отображаемые элементы 2140 из 1273

(19940201)In this paper the authors consider the problem of Laplace transform inversion in the case where the transform is given in a finite set of equidistant points. They propose a criterion, based on crossvalidation, for the ...

(19940401)The adaptive (online) estimation of parameters for a class of secondorder distributed parameter systems is considered. This class of systems, which includes abstract wave and beam equations with a variety of forms of ...

(19940201)One key question when extending wave imaging algorithms to strongly attenuating environments like a damaged metallic structure where eddy currents are generated, is how to deal with evanescent waves. A similar question ...

(19941001)A general algorithm for the direct inversion of data to yield unknown functions entering physical systems is presented. Of particular interest are linear and nonlinear dynamical systems. The potential broad applicability ...

(19890401)The authors discuss a method for reconstructing a symmetric band matrix from spectral data. The method is an analogue of the Gel'fandLevitan procedure used for constructing a differential operator from the spectral data. ...

(19900201)Following the work of Caudrey (1984), the authors solve the inverse spectral problem for a discrete analogue of the matrix spectral equation psi x=(A( delta y)+B(x,y)) psi . Related nonlinear evolution equations are examined ...

(19961201)Motivated by electromagnetic wave propagation in media where permittivity varies in two dimensions, we address the problem of wave scattering for twodimensional (2D) media having variable speed. Wave speed variations are ...

(19970401)We develop a new algorithm for solving inverse acoustic scattering problems. In particular we show that this algorithm can reproduce scattering shapes efficiently, using synthetic data, from only one incident wave in the ...

(19951001)We consider the inversion of the threedimensional (3D) Xray transform with a limited data set containing the line integrals which have two intersections with the lateral surface of a cylindrical detector. The usual ...

(19850501)The inverse scattering problem for the Schrodinger equation in R3 is solved by applying a Marchenko procedure in the Faddeev method. The characterisation is formulated as a Hilbert transform and yields a simple formula for ...

(19961001)We present a Lax representation for a family of finitedimensional integrable Hamiltonian systems (FDIHS). Their classical Poisson structures are constructed. The associated rmatrices depend not only on the spectral ...

(19971001)An ndimensional (n = 2,3) inverse problem for the parabolic/diffusion equation , , , is considered. The problem consists of determining the function a(x) inside of a bounded domain given the values of the solution u(x,t) ...

(19961001)In this paper we present a new method for solving inverse obstacle scattering problems where the far field for many incident plane waves is known. The main idea of the method is to approximate point sources by a superposition ...

(19990801)Volume imaging in positron emission tomography (PET) requires the inversion of the threedimensional (3D) xray transform. The usual solution to this problem is based on 3D filteredbackprojection (FBP), but is slow. ...

(19900801)The authors consider the data obtained from a hypothetical transmission experiment in which a moving fluid with variable index of refraction is probed using acoustic transmitters and receivers. A projectionslice theorem ...

(19910401)The twodimensional layered volume conductor forward and inverse problems are solved by modelling the medium as an equivalent twodimensional filter relating the source and measured potentials. This extends previous results ...

(19890801)A finitedifference solution is demonstrated for an inverse problem of determining a control function p(t) in the parabolic partial differential equation ut=uxx+pu+f(x,t), 0<x<1;0<t<or=T.

(19991001)The paper considers the Galerkin finiteelement approximation of the Boltzmann transport equation for charged particles. The aim is to model the electron transport in biological tissue for the dose calculation and to apply ...

(19951201)The inverse Dirichlet problem for Laplace`s equation in two dimensions entails recovery of quantitative information about the boundary value function on a curve C, from a finite collection of samples of a harmonic function, ...

(19900401)A fullyGalerkin approach to the coefficient recovery (parameter identification) problem for a linear parabolic partial differential equation is introduced. The forward problem is discretised with a sinc basis in the ...
Отображаемые элементы 2140 из 1273