摘要 :
Long-Term Goals: To understand and exploit the resonance scattering by swimbladder-bearing fish (typically in the 1-10 kHz frequency region). Exploitation of the resonances can significantly reduce ambiguities in interpreting acou...
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Long-Term Goals: To understand and exploit the resonance scattering by swimbladder-bearing fish (typically in the 1-10 kHz frequency region). Exploitation of the resonances can significantly reduce ambiguities in interpreting acoustic scattering in terms of meaningful biological parameters compared with traditional higher frequency approaches and other lower frequency narrowband approaches. Objectives: To conduct a new class of quantitative acoustic studies of scattering by swimbladder-bearing fish utilizing new broadband-acoustic technology that is optimized for use in the resonance scattering region of fish.
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摘要 :
To understand and exploit the resonance scattering by swimbladder- bearing fish (typically in the 1-10 kHz frequency region). Exploitation of the resonances can significantly reduce ambiguities in interpreting acoustic scattering ...
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To understand and exploit the resonance scattering by swimbladder- bearing fish (typically in the 1-10 kHz frequency region). Exploitation of the resonances can significantly reduce ambiguities in interpreting acoustic scattering in terms of meaningful biological parameters compared with traditional higher frequency approaches.
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摘要 :
Electron angular distributions of inelastic electron scattering from O2physisorbed on graphite have been studied extensively by Palmer and coworkers. Their results have been published in more than sight papers over the past four y...
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Electron angular distributions of inelastic electron scattering from O2physisorbed on graphite have been studied extensively by Palmer and coworkers. Their results have been published in more than sight papers over the past four years and summarized in two recent review articles. We have reinterpreted their data and in some aspects come to different conclusions.... Inelastic electron scattering, Molecular oxygen, Resonant states.
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In this note a method is given to characterize and distinguish the kinematical and dynamical resonances in the scattering of elementary particles by studying the resonance energy as a function of the coupling constant. The ambigui...
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In this note a method is given to characterize and distinguish the kinematical and dynamical resonances in the scattering of elementary particles by studying the resonance energy as a function of the coupling constant. The ambiguity of the solutions of the dispersion relations is resolved and the relation of the kinematical and dynamical resonances to bound states is discussed.
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摘要 :
To conduct a new class of quantitative studies of acoustic scattering by swimbladder-bearing fish utilizing new broadband-acoustic technology that is optimized for use in the resonance scattering region of fish. The studies, which...
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To conduct a new class of quantitative studies of acoustic scattering by swimbladder-bearing fish utilizing new broadband-acoustic technology that is optimized for use in the resonance scattering region of fish. The studies, which include use of a long-range horizontal-looking system and a short-range downward-looking system, exploit the resonance scattering of the fish to significantly reduce ambiguities in the interpretation of the data.
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We describe analytical formalism for estimating neutron radiative capture and elastic scattering cross section covariances in the resolved resonance region. We use capture and scattering kernels as the starting point and show how ...
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We describe analytical formalism for estimating neutron radiative capture and elastic scattering cross section covariances in the resolved resonance region. We use capture and scattering kernels as the starting point and show how to get average cross sections in broader energy bins, derive analytical expressions for cross section sensitivities, and deduce cross section covariances from the resonance parameter uncertainties in the recently published Atlas of Neutron Resonances. The formalism elucidates the role of resonance parameter correlations which become important if several strong resonances are located in one energy group. Importance of potential scattering uncertainty as well as correlation between potential scattering and resonance scattering is also examined.
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We consider the problem of the scattering of a photon by hydrogen in the ground state when the photon has its principal frequencies near that of Lyman- radiation. We obtain the scattering operator and cross-section for this proces...
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We consider the problem of the scattering of a photon by hydrogen in the ground state when the photon has its principal frequencies near that of Lyman- radiation. We obtain the scattering operator and cross-section for this process.
Our procedure is to adapt Dirac's theory of resonance scattering to the problem and, by quantizing the electromagnetic field in an angular momentum basis, to solve the problem exactly within the framework of the Dirac theory.
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This annual report summarizes research efforts on Contract N00014-76-C-1079 for the period 15 September, 1976 to 15 September 1977. An investigation of the feasibility of extending an existing radar target identification scheme to...
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This annual report summarizes research efforts on Contract N00014-76-C-1079 for the period 15 September, 1976 to 15 September 1977. An investigation of the feasibility of extending an existing radar target identification scheme to the case of naval vessels is reported. The existing scheme is based on the complex natural resonances of a target associated with transient responses synthesized from multiple frequency scattering data. To this end, multiple frequency scattering data of good model targets of various vessel classes in a simulated ocean environment are reported. From these data special target response waveforms are generated and natural resonances extracted. Results are given showing the identification potential of both the response waveforms and the complex natural resonances. In a concluding section recommendations are made for a logical continuation of the research effort. (Author)
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