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 20 of 192 for “"backscattering"”.
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High-Frequency Backscattering From an Airborne Target
Made available in DSpace on 2014-12-10T19:07:15Z (GMT). No. of bitstreams: 1 7411982.pdf: 3764585 bytes, checksum: a06cbab16ae447500f8d535529c59bf9 (MD5) Previous issue date: 1973
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APPLICATION OF RUTHERFORD BACKSCATTERING SPECTROMETRY IN NONDESTRUCTIVE ANALYSIS.
A Rutherford backscattering spectrometry facility has been designed and built at the University of Arizona. Initial calibration and testing has been carried out in order to accurately characterize the system and make it ready to perform reliable analyses. Also, an explanation of basic RBS …
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Enhanced backscattering of seismic waves from irregular interfaces
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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Low-frequency bottom backscattering data analysis using multiple constraints beamforming
The data analysis of a deep-sea bottom backscattering experiment, carried out over a sediment pond on the western flank of the Mid-Atlantic Ridge in July 1993 with a 250- 650 Hz chirp source and a vertical receiving array suspended near the fiat seafloor, is presented in this thesis. Reflected …
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Electromagnetic backscattering from penetrable rough surfaces based on moment method
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Low-frequency bottom backscattering data analysis using multiple constraints beamforming
Thesis (Ocean. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995.
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Coupled modes analysis of SRS backscattering, with Langmuir decay and possible cascadings
… The effects of LDI on the saturation of the SRS backscattering have been investigated, considering typical parameters from recent experiments. Detailed simulations with the coupled mode equations in a finite length plasma, with real wave envelopes and no wave dephasing, are explored here for the …
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Modeling of monostatic bottom backscattering from three-dimensional volume inhomogeneities and comparisons with experimental data
… sediment cover. The data analysis of the ARSRP backscattering experiment revealed that random inhomogeneities in two irregular layers beneath the seafloor were the primary contributors to oblique backscattering in a sediment pond on the western flank of the Mid-Atlantic Ridge. In this thesis, an …
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Modeling of monostatic bottom backscattering from three-dimensional volume inhomogeneities and comparisons with experimental data
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1997.
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Mid-frequency acoustic backscattering from finite cylindrical shells and the influence of helical membrane waves
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1993.
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A model for backscattering angular response of gassy sediments: Applications to petroleum exploration and development programs
<p>The location and distribution of near-surface gas in continental margins is of particular interest for oil exploration and development programs. The presence of gas seepages can be evidence of the possible existence of subsurface hydrocarbon reservoirs. Gas is also a potential hazard for …
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A backscattering ion channeling study of the lattice site location of the constituents of two systems
Backscattering ion channeling measurements were performed to determine the lattice site location of the constituents of two systems. For (GaSb) 1_x(Ge2)x spectra were obtained at a set of incident beam orientations along an angular scan through the [110] direction and nearly parallel to the [110) …
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Sol-gel coatings containing inorganic and organic compounds--studies using Rutherford backscattering spectrometry and UV-VIS spectroscopy
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1990.
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Differential light scattering spectroscopy measurements for detecting and imaging cancer
… spectroscopy (LSS), the study of single elastic backscattering as a function of wavelength and angle, can detect subcellular structural changes in early cancer. We have developed two novel differential light scattering spectroscopy techniques, space differential LSS (SD/LSS) and b-angle …
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Suppression of disorder-induced scattering in optomechanical systems
… 12, 2006). Minimizing disorder-induced Rayleigh backscattering has thus been a significant challenge until now. It has been shown that backscattering from disorder can be suppressed by breaking time-reversal symmetry in magneto-optic (Sov Phys JETP, 59, 1, 1984; Phys Rev B, 37, 1988) and …
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Broadband acoustical scattering in coastal environments: application to gelatinous organisms
… withlaboratory measurements of broadband backscattering from live individuals. The model predicts backscattering levels and broad spectral behavior within <2 dB. In Chapter 3, a towable instrument is developed for measuring broadband excess attenuation from bubbles from which the size …
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Broadband acoustical scattering in coastal environments: application to gelatinous organisms and gas microbubbles
… with laboratory measurements of broadband backscattering from live individuals. The model predicts backscattering levels and broad spectral behavior within <2 dB. In Chapter 3, a towable instrument is developed for measuring broadband excess attenuation from bubbles from which the size …
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The taiji and infinity-loop microresonators: examples of non-hermitian photonic systems
… of the bus waveguide facets. The effect of backscattering, mainly due to the waveguide surface-wall roughness, on the microresonators is also studied. This phenomenon induces simultaneous excitation of the clockwise and counterclockwise modes, leading to eigenvalue splitting. This splitting …
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Changes in the near-surface stress in titanium caused by krypton ion-implantation
… scanning electron microscopy (SEM). Rutherford backscattering spectrometry (RBS) was also used to determine the dose and depth of implanted krypton. The krypton profiile in titanium, and the associated damage profile, was modelled with TRIM calculations. In addition, metallurgical techniques …
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