Ehud Heyman

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— This paper investigates a certain class of three-dimensional (3-D) (volume) sources to the scalar wave equation that are capable of radiating high-amplitude short-duration pulses in a selected (main) direction and low-amplitude long-duration pulses in other directions. Parameterization and characterization of such sources and the fields that they radiate(More)
Wave propagation in complex inhomogeneous, quasi-layered, 3D media is addressed using multires-olution analysis (MRA). The complexity is characterized by a fast, nely structured, variation of the system heterogeneity in the vertical (stratiication) direction, and a slow horizontal variation of the system heterogene-ity and/or the vertical boundaries (\fast"(More)
—Conventional theories addressing the wave-dynamic behavior of plane-stratified multilayer environments usually involve wavenumber spectral and asymptotic techniques, which apply to layer thickness of the same " macroscale " order as the wavelengths in the spectrum of the excitation. However, in applications of multilayer bonded laminates (for example, in(More)
—In a previous paper [1], we studied transient radiation from scalar collimated volume source distributions subjected to impulsive excitation. In this paper, we extend our analysis and results to the case of nonimpulsive excitation, paying special attention to the parameterization of the radiation pattern of three-dimensional (3-D) ellipsoid source(More)
|The use of models of ctitious elemental current sources, located inside the scatterer, to simulate the scattered eld, has proved to be an eecient computational technique for analyzing scattering by metallic bodies. This paper presents a novel modiication of the technique in which the omnidirectional elemental sources are arranged in groups of array-sources(More)
We present a time domain algorithm for computation of the maximum likelihood estimate of the location of a known scattering object from wide-band scattering data acquired in a suite of scattering experiments. The algorithm consists of a three-step procedure: (1) data filtering, (2) time-domain backpropagation, and (3) coherent summation and is implemented(More)
IVe present, an efficient algorithm for computation of the maximum likelihood estimate of the location of a known target , from short. pulse scatter data. The algorithm consitutes a three step procedure: (i) data filtering. (ii) time-domain backpropagation. and (iii) coherent. summation and consists of a number of projection and backprojection operations(More)
— A multi-scale analysis of scattering from an interface between a spatially homogeneous waveguide and a finely structured laminate is performed. We use Multi-Resolution Homogenization theory to derive the leading macroscopic scattering phenomena, and a scale-related modal analysis to derive fine-scale corrections. The latter represent a micro-scale field(More)
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