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pro vyhledávání: '"D. N. Ghosh Roy"'
Autor:
D. N. Ghosh Roy
Publikováno v:
Applied Mathematical Analysis: Theory, Methods, and Applications ISBN: 9783319999173
Wave propagation and scattering occupy a large part of physical, mathematical and engineering sciences. The purpose of this chapter is to present the basic mathematical theory of certain aspects of wavefields, that is, waves and fields, as they occur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d7c530eee912b8e283a7be93cb98695b
https://doi.org/10.1007/978-3-319-99918-0_7
https://doi.org/10.1007/978-3-319-99918-0_7
Publikováno v:
Journal of Engineering Mathematics. 79:167-181
Scalar wave scattering is discussed using pseudopotentials. These are singular, wavefunction-dependent source terms subsuming the scattering properties of the object. The latter can be an impenetrable body or an inhomogeneity. In this approach, the b
Autor:
Gregory J. Orris, D. N. Ghosh Roy
Publikováno v:
The Journal of the Acoustical Society of America. 114:626-633
Scattering from a Born inhomogeneity in a homogeneous, acoustical waveguide is considered and results compared to the corresponding scattering in a homogeneous, unbounded medium. It is found that the Ewald sphere in the unbounded medium case is repla
Publikováno v:
The Journal of the Acoustical Society of America. 104:2615-2621
Results are reported for direct and inverse scattering of plane acoustic waves from sound-hard scatterers of arbitrary shapes in an infinite, homogeneous ambience. The direct problem is solved via a shape deformation technique which is valid for fini
In dynamic cardiac SPECT estimates of kinetic parameters of a one-compartment perfusion model are usually obtained in a two step process: 1) first a MAP iterative algorithm, which properly models the Poisson statistics and the physics of the data acq
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4d84f0107ba9b38a657b4b2fbba98e0c
https://doi.org/10.2172/928329
https://doi.org/10.2172/928329
Publikováno v:
The Journal of the Acoustical Society of America. 119:3215-3216
The notion of the adjoint operator/field is introduced, and its general importance in physical sciences briefly discussed. The applications of the adjoint in the solutions of inverse scattering problems for plane‐wave excitation are overviewed for
Autor:
D. N. Ghosh Roy
Publikováno v:
Lecture Notes in Physics ISBN: 9783540575764
Lecture Notes in Physics ISBN: 9783662139714
Lecture Notes in Physics ISBN: 9783662139714
There are numerous problems in physics the solutions of which require the inversion techniques used for reconstructing the potential in 1-D Schrodinger equation. An important generalization of this problem involves the nonlinear Schrodinger equation
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::87ded938dcf4e6a3c68b0d99d7550a21
https://doi.org/10.1007/3-540-57576-6_1
https://doi.org/10.1007/3-540-57576-6_1
Autor:
George L. Fischer, Joseph A. Akkara, David L. Kaplan, Devulapalli V. G. L. N. Rao, Joseph F. Roach, Francisco J. Aranda, D. N. Ghosh Roy
Publikováno v:
Nonlinear Optics III.
Self-focusing of ruby laser beams is observed in solution for a series of bioengineered polymers. The values obtained for third order nonlinear optical susceptibility (Chi) (3) are compared with observed values by degenerate four wave mixing. It is d
Autor:
D. N. Ghosh Roy, D. V. G. Rao
Publikováno v:
Nonlinear Optics: Materials, Fundamentals, and Applications.
The generation of an optically phase conjugated signal in four-wave-mixing (FWM) is usually interpreted1–2 as a coherent addition of diffracted waves from the grating structures formed in the nonlinear optical medium by the pump beams. In this pape
Autor:
D. N. Ghosh Roy, D. V. G. L. N. Rao
Publikováno v:
Optical Society of America Annual Meeting.
Transient NOPC is analyzed from the viewpoint of potential scattering. The probe, the nonlinear optical medium, and the conjugate fields are represented by appropriate wavepackets. Instead of considering the generation of a conjugate wave as a cohere