Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"multiple scattering theory"”.
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Molecular partitioning and approximate coupling techniques in multiple scattering theory
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1984.
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Models for meson-deuteron scattering in the resonant region
"The Watson formulation of multiple scattering theory is derived and then employed to build a model for meson-deuteron scattering. The Glauber theory is also derived as an approximate form of multiple scattering theory. The developed model extends the Glauber description to regions in which the …
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Nanostructures and alloys : multiple scattering and nonlinearities in phonon transport
… and dielectrics. Effective field theories and scattering theory have been combined to model alloys and systems with embedded nanostructures. The simplest of such effective field theories, the Virtual Crystal approximation, fails to capture short-length scale information due to the inherent …
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Nuclear Fragmentation Energy and Momentum Transfer Distributions in Relativistic Heavy-Ion Collisions
… collisions, based upon composite particle multiple scattering theory, is presented. Transverse and longitudinal momentum transfers to the projectile are shown to arise from the real and absorptive part of the optical potential, respectively. Comparisons of fragment momentum distribution …
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Measurement of nuclear transparency from A(e,e'[pi]⁺) reactions
… Q2 compared with predictions based on Glauber multiple scattering theory. This experiment represents the first nuclear transparency data from (e,e'[pi]+) reactions.
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An Investigation of the Multiple Scattering of Waves in Two-Dimensional Random Media
… cases, the comparisons indicate that neither theory holds a distinct advantage over the other in terms of accuracy, and both may appear valid to the experimentalist in the lab or field. Finally, the use of multiple scattering theory to predict the modal density of a random medium was …
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Ultrasonic propagation in cancellous bone
… the longitudinal ultrasonic velocity, the scattering effect and the attenuation as a function of frequency were measured on a range of cancellous bone samples, from healthy to severely osteoporotic, and also a few cortical samples. The cancellous bone was human os calces and vertebrae. The …
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Sonic Crystal Noise Barriers
… Crystal (SC) is investigated. As a result of multiple (Bragg) scattering, SCs exhibit a selective sound attenuation in frequency bands called band gaps or stop bands related to the spacing and size of the cylinders. Theoretical studies using Plane Wave Expansion (PWE), Multiple Scattering …
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Models for sound propagation in suspensions and emulsions
… Three theoretical approaches are identified: scattering theory, coupled phase theory and porous media theory. Coupled phase theory is extended and compared analytically and numerically to scattering and porous media theory. Important regimes of scattering theory - the lossless and viscothermal …
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The effect of surface roughness on thermal and acoustic phonon transport in nanowires and nanomembranes
… the experiments are interpreted through wave scattering theory. This work investigates Si nanowires and nanomembranes with characteristic sizes smaller than 200 nm. Using a MEMS-based measurement platform, we observe the low-temperature dependence of thermal conductivity in silicon nanowires …
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Dose Calculation For Electron Therapy
… the beam. This complicated dependence is due to multiple scattering of the electron beam as the beam travels from the accelerator head to the patient. The dosimetry of only regular field shapes (circular, square, or rectangular) is well developed. However, most tumors have irregular shapes and …
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Electronic structure and energetics of Fe-based superconductors: Effects of chemical and magnetic disorder in (Ba-X)(Fe-Y)2As2
… the all-electron, Korringa-Kohn-Rostoker (KKR) multiple scattering theory in combination with the coherent-potential approximation (CPA) to handle chemical (alloying) and magnetic (orientational) disorder, all implemented within a self-consistent-field, density functional theory (DFT). For $Tm$ …