Strong group-velocity dispersion compensation with phase-engineered sheet metamaterials [PDF]
, 2014 Resonant metamaterials usually exhibit substantial dispersion, which is considered a shortcoming for many applications. Here we take advantage of the ability to tailor the dispersive response of a metamaterial, introducing a new method of group-velocity ...
B. Dastmalchi +3 more
semanticscholar +1 more source
Fluidization of Group B particles with a rotating distributor [PDF]
, 2008 A novel rotating distributor fluidized bed is presented. The distributor is a rotating perforated plate, with 1% open-area ratio. This work evaluates the performance of this new design, considering pressure drop, Δp, and quality of fluidization.
Sobrino Fernández, Celia +6 more
core +1 more source
Study on the ultra-wide band gap characteristics of novel star-shaped chiral metamaterials
Hangkong gongcheng jinzhanThe suppression of vibration and noise has always been an important issue in engineering，and metamaterials have shown significant application value in vibration and noise reduction.
WANG Shuo +7 more
doaj +1 more source
Alfvén waves: To the 80th anniversary of discovery
Solar-Terrestrial Physics, 2022 The article is dedicated to the anniversary of the discovery of Alfvén waves. The concept of Alfvén waves has played an outstanding role in the formation and development of cosmic electrodynamics.
Guglielmi A. V. +2 more
doaj +1 more source
Some Theorems in Group Velocity [PDF]
Proceedings of the Edinburgh Mathematical Society, 1956 We consider a medium in which the equation satisfied by a disturbance ø(x,t) is capable of solutions of the form sin(vx—wt), with v and ω real but not necessarily of the same sign. If the phase velocity U = ω/v is not of constant magnitude the medium is said to be dispersive, and the group velocity V may conveniently be defined as dω/v, an expression ...
openaire +2 more sources
Inverse characterization of plates using zero group velocity Lamb modes.
Ultrasonics, 2016 In the presented work, the characterization of plates using zero group velocity Lamb modes is discussed. First, analytical expressions are shown for the determination of the k-ω location of the zero group velocity Lamb modes as a function of the Poisson ...
C. Grünsteidl +3 more
semanticscholar +1 more source
Fully nonlinear inversion of fundamental mode surface waves for a global crustal model [PDF]
, 2007 We use neural networks to find 1-dimensional marginal probability density functions (pdfs) of global crustal parameters. The information content of the full posterior and prior pdfs can quantify the extent to which a parameter is constrained by the data.
Meier, U. +2 more
core +1 more source
A Comprehensive Investigation of the Two-Phonon Characteristics of Heat Conduction in Superlattices
CrystalsThe Anderson localization of phonons in disordered superlattices has been proposed as a route to suppress thermal conductivity beyond the limits imposed by conventional scattering mechanisms.
Pranay Chakraborty +4 more
doaj +1 more source
Hermiticity-tunable beam reshaping: localization, recurrence and group velocity oscillation
New Journal of Physics, 2019 We propose a novel method to reshape the light beam in a Hermiticity-tunable photonic lattice with PT symmetric perturbations. By adjusting the PT perturbations, the Hermiticity of the system varies alternatively, further resulting in the periodic ...
Kaiwen Ji +7 more
doaj +1 more source
Ray Trace Tomographic Velocity Analysis of Surface Seismic Reflection Data [PDF]
, 1988 Recent development of two technologies allows application of a generalized formulation of travel time inversion to very large data sets, such as the surface reflection surveys collected for oil exploration.
Stork, Christof
core +1 more source