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.
Results
Showing 1 to 20 of 34 for “"Forward scattering"”.
-
Forward scattering of a pulsed continuous wave signal through laminar and turbulent thermal plumes
The results of an experiment examining the forward propagation or an acoustic signal through a buoyant plume are discussed. Two distinct testing sights were used. One made use of a small fresh water tank in NUWC to provide a controlled plume. The other used a larger salt water tank at WHOI to …
-
Nuclear Forward-Scattering of Synchrotron Radiation From Krypton: First Observation and Application to the Study of Lattice Dynamics in Near-Monolayer Krypton-on-Graphite
<p>Since 1985 nuclear-resonant scattering, and in particular nuclear forward-scattering, of synchrotron radiation has been observed in a select few Mossbauer isotopes including: <sup>57</sup>Fe, <sup>119</sup>Sn, <sup>169</sup>Tm. For the first time, nuclear forward-scattering from the 9.4 keV …
-
Forward and inverse scattering problems in the time domain
… the 2${1\over 2}$-dimensional electromagnetic forward scattering problem in the time domain is developed, which circumvents the use of three-dimensional arrays to solve the vector wave problem. The method is based on calculating the three-dimensional fields as a summation of Fourier-transformed …
-
Mean, variance, and temporal coherence of the 3D acoustic field forward propagated through random inhomogeneities in continental-shelf and deep ocean waveguides
… random inhomogeneities accumulates by multiple forward scattering over range. This causes significant random fluctuations in the received field and greatly affects underwater acoustic sensing and communication systems, such as Ocean Acoustic Waveguide Remote Sensing(OAWRS). In order to …
-
LIGHT SCATTERING FROM AMMONIA AND WATER CRYSTALS
… Jupiter's upper clouds, but both their shape and scattering properties were unknown at the start of this work. Ammonia crystals and water crystals were grown in a cold chamber at temperatures 20°C below their freezing points (0°C and -77.7°C, respectively). The H₂O crystals formed had shapes in …
-
The proton Compton effect: A measurement of the electric and magnetic polarizabilities of the proton
The Compton scattering cross section on hydrogen was measured at 60$\sp\circ$ and 135$\sp\circ$ in order to determine the largely unknown electric and magnetic polarizabilities of the proton. The cross sections were measured using tagged photons spanning 32 through 72 MeV in energy. In this energy …
-
A Radiative Analysis of Angular Signatures and Oblique Radiance Retrievals Over the Polar Regions From the Multi-Angle Imaging Spectroradiometer
… that low level clouds appear bright at oblique forward-scattered angles because of the presence of small, spherical droplets. (3) This dissertation provides the first evaluation of several popular ice surface reflectance models in MODTRAN using MISR observations as model restraints. The …
-
MOMENTUM SIGNATURES OF THE ANDERSON TRANSITION
… and two interference peaks, the coherent backscattering (CBS) and the coherent forward scattering (CFS) peaks in the momentum distribution. We show, the signatures of Anderson localization and the Anderson transition are encoded in the dynamical properties of the two interference peaks, CBS …
-
High resolution scattering measurements for stationary particles
… not only light extinction but multi angle light scattering. Cylindrical particles scatter light in a way that can be quantified by electromagnetic wave theory. This scattering distribution is directly related to the cylinders diameter and material properties, as well as the wavelength of the …
-
Comparative Study of Forward and Diffusely Scattered Light in a Coherently Prepared Ultracold Rubidium Gas
<p>A comparison between forward and diffusely scattered light propagating in a coherently prepared ultracold <sup>87</sup>Rb atomic vapor is presented. This research is part of the ongoing effort to characterize the processes, such as diffusion, that contribute to coherence loss in atomic media …
-
Electromagnetic Scattering From a Strongly Turbulent Medium
… When the fluctuation is weak, the single scattering theory is widely used and found to be satisfactory; however, as many practical situations are known to exist, if fluctuations are strong, the multiple scattering effect must be taken into account. In this report, two theoretical models of …
-
Forward sound propagation around seamounts : application of acoustic models to the Kermit-Roosevelt and Elivs seamounts
The Basin Acoustic Seamount Scattering Experiment (BASSEX) of 2004 was conducted to measure forward-scattering around the Kermit-Roosevelt Seamount Complex in the Northeast Pacific. The BASSEX experiment was focused on the bathymetric effects on acoustic propagation, in particular, on direct …
-
Dynamical models for novel diffraction techniques in SEM
… dislocations close to the surface; and back(/forward)scattering diffraction,or diffraction out, which provides a variety of information about grain distribution,orientation and strain. Both of these diffraction modalities involve the same physical processes, so it makes sense to use the same …
-
Sterile neutrino searches at the Icecube Neutrino Observatory
… within the Earth, neutral current elastic forward scattering is predicted to induce a transition into a sterile state. This thesis presents two 3+1 sterile neutrino analyses by searching for spectral differences in the reconstructed energy and zenith direction of muon neutrino events, …
-
Transfer of an evolving technology
… FTIR, and Raman spectroscopy. Hydrogen forward scattering, surface bead angle, and atomic force microscopy were also employed. A series of experiments was conducted to: 1) Analyze the impact of deposition parameters on the performance of the film. 2) Match the performance of films …
-
Advanced Projection Ultrasound Imaging with CMOS-based Sensor Array: Development, Characterization, and Potential Medical Applications
… a new analytical method to model ultrasound forward scattering distribution (FSD) was developed by employing a specific annular apparatus. After applying this method, the scattering-corrected C-scan images revealed more detail structures as compared to unprocessed images. This new analytical …
-
Gamow-Teller strength distributions in 64Co and 64Cu studied via the 64Ni(d,2He) and 64Ni(3He, t) reactions
… For intermediate incident energies and very forward scattering angles, peaks corresponding to Gamow-Teller (GT) transitions are expected to dominate the measured spectra and their cross sections becomes proportional to the transition strength. We performed two different reactions on 64Ni for …
-
Understanding and Improving Moment Method Scattering Solutions
… of moment method solutions to electromagnetic scattering problems has been studied by many researchers. Error bounds for the moment method have been obtained in terms of Sobolev norms of the current solution. Motivated by the historical origins of Sobolev spaces as energy spaces, it is shown …
-
Measurement of double longitudinal asymmetries, A_{LL}, for pi0 production in polarized pp scattering at low Bjorken-x
… the Muon Piston Calorimeter, MPC, covering forward scattering angles corresponding to pseudorapidities 3.1 < η < 3.9. This measurement will extend the sensitivity for spin contributions from gluons with small momenta reaching 0.001. For the high luminosity run in 2013, the MPC was upgraded …
-
Improving Object Classification in X-ray Luggage Inspection
… to improve the system performance. The back scattering and forward scattering signals are functions of solid angles between the object and detectors. A given object may be randomly placed anywhere on the conveyor belt, resulting in a variation in the detected signals. Both an adaptive …
Page 1 of 2