Bragg scattering of surface waves by periodic bars: theory and experiment

1987 ◽  
Vol 34 (12) ◽  
pp. 1025
Keyword(s):  
Surface Waves ◽  
Bragg Scattering ◽  
Theory And Experiment

Bragg scattering of surface waves by periodic bars: theory and experiment

1987 ◽  
Vol 178 ◽  
pp. 221-241 ◽  
Author(s):  
Tetsu Hara ◽  
Chiang C. Mei
Keyword(s):  
Surface Waves ◽  
Short Wave ◽  
Second Order ◽  
Order Effects ◽  
Bragg Scattering ◽  
First Order ◽  
Linearized Theory ◽  
Incident Waves ◽  
Theoretical Results ◽  
Theory And Experiment

We extend a recent linearized theory on Bragg scattering of surface waves by periodic sandbars to include second-order effects of the free surface and of the bars. New experiments are performed to verify the existence of the cutoff detuning frequency, the dispersive nature of the first-order wave envelope, and the radiation of second-order long waves. Measured transient and quasi-steady responses to incident wave packets and uniform wavetrains are compared with corresponding theoretical results. For quasi-steady incident waves of relatively small steepness it is found necessary to improve the theory to the second order in bar slope, in order that the calculated short-wave envelopes agree with those measured over the bars.

Note on Bragg scattering of water waves by parallel bars on the seabed

1988 ◽  
Vol 186 ◽  
pp. 147-162 ◽  
Author(s):  
Chiang C. Mei ◽  
Tetsu Hara ◽  
Mamoun Naciri
Keyword(s):  
Surface Waves ◽  
Water Waves ◽  
Oblique Incidence ◽  
Recent Theory ◽  
Bragg Scattering

A recent theory of Bragg scattering of surface waves by sinusoidal sandbars on a seabed is applied to three cases not examined heretofore: (1) oblique incidence on a strip of infinitely long bars, (2) oblique incidence on the corner of a bar field and (3) seabed with a mean slope. While the Bragg mechanism has been studied previously for sandbars present on many shorelines, it can be a basis for breakwaters where the soil is not strong enough to support a single massive breakwater.

Multiple Diffraction of X-Rays

1982 ◽  
Vol 37 (5) ◽  
pp. 437-447 ◽  
Author(s):  
Roberto Colella
Keyword(s):  
High Resolution ◽  
X Rays ◽  
Bragg Scattering ◽  
Multiple Diffraction ◽  
Phase Determination ◽  
Method Of Solution ◽  
Electric Effect ◽  
Effect Phase ◽  
Theory And Experiment ◽  
General Method

The phenomenon of n-be&m diffraction (n>2) is discussed with particular attention being devoted to the Bragg case of diffraction. The general method of solution is outlined, and some applications to specific situations are discussed. These include experiments in which strong quasi- monochromatic phonon beams are excited in a crystal using the Acousto-Electric effect, phase determination using the concept of „Virtual Bragg Scattering”, and high resolution Bragg reflec­tion topographs. In all cases the agreement between theory and experiment has been found excellent.

Nonlinear focusing of surface waves by a lens – theory and experiment

1983 ◽  
Vol 135 (-1) ◽  
pp. 71 ◽  
Author(s):  
Jakob J. Stamnes ◽  
Odd Løvhaugen ◽  
Bjøsrn Spjelkavik ◽  
Chiang C. Mei ◽  
Edmond Lo ◽  
...  
Keyword(s):  
Surface Waves ◽  
Nonlinear Focusing ◽  
Theory And Experiment

High Temperature Studies of Stoichionetric Cerium Dioxide

1986 ◽  
Vol 82 ◽  
Author(s):  
J. Faber ◽  
R. L. Hitterman
Keyword(s):  
Cerium Dioxide ◽  
Bragg Scattering ◽  
Oxygen Sublattice ◽  
Scattering Measurements ◽  
Neutron Time ◽  
Tensor Representations ◽  
Anharmonic Interactions ◽  
Integrated Intensities ◽  
Increasing Temperature ◽  
Theory And Experiment

ABSTRACTHigh-resolution, neutron time-of-flight Bragg scattering measurements have been carried out on polycrystalline CeO2 as a function of temperature (20<T<1200C). Systematic deviations between theory and experiment for the integrated intensities of the Bragg reflections were observed; these deviations increased with increasing temperature. The deviations result from cubic anharmonic interactions that appear only on the oxygen sublattice. The results are discussed in terms of higher order cumulant tensor representations. We observe that these anharmonic interactions exhibit the same symmetry as those associated with defects incorporated into the fluorite lattice when CeO2 is made nonstoichiometric.

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