Time-resolved electroabsorption measurement of the electron velocity-field characteristic in GaN

2000 ◽  
Vol 76 (9) ◽  
pp. 1155-1157 ◽  
Author(s):  
M. Wraback ◽  
H. Shen ◽  
J. C. Carrano ◽  
T. Li ◽  
J. C. Campbell ◽  
...  
Keyword(s):  
Velocity Field ◽  
Electron Velocity ◽  
Time Resolved ◽  
Field Characteristic

The electron velocity-field characteristic for n-In0.53Ga0.47As at 300 K

1982 ◽  
Vol 3 (1) ◽  
pp. 18-20 ◽  
Author(s):  
T.H. Windhorn ◽  
L.W. Cook ◽  
G.E. Stillman
Keyword(s):  
Velocity Field ◽  
Electron Velocity ◽  
Field Characteristic

Resonance dynamics in compressible cavity flows using time-resolved velocity and surface pressure fields

2017 ◽  
Vol 830 ◽  
pp. 494-527 ◽  
Author(s):  
Justin L. Wagner ◽  
Steven J. Beresh ◽  
Katya M. Casper ◽  
Edward P. DeMauro ◽  
Srinivasan Arunajatesan
Keyword(s):  
Velocity Field ◽  
Shear Layer ◽  
Surface Pressure ◽  
Coherent Structures ◽  
Acoustic Waves ◽  
Mode Switching ◽  
Recirculation Region ◽  
Mean Flow ◽  
Time Resolved ◽  
Phase Velocities

The resonance modes in Mach 0.94 turbulent flow over a cavity having a length-to-depth ratio of five were explored using time-resolved particle image velocimetry (TR-PIV) and time-resolved pressure sensitive paint (TR-PSP). Mode switching was quantified in the velocity field simultaneous with the pressure field. As the mode number increased from one through three, the resonance activity moved from a region downstream within the recirculation region to areas further upstream in the shear layer, an observation consistent with linear stability analysis. The second and third modes contained organized structures associated with shear layer vortices. Coherent structures occurring in the velocity field during modes two and three exhibited a clear modulation in size with streamwise distance. The streamwise periodicity was attributable to the interference of downstream-propagating vortical disturbances with upstream-travelling acoustic waves. The coherent structure oscillations were approximately $180^{\circ }$ out of phase with the modal surface pressure fluctuations, analogous to a standing wave. Modal propagation (or phase) velocities, based on cross-correlations of bandpass-filtered velocity fields were found for each mode. The phase velocities also showed streamwise periodicity and were greatest at regions of maximum constructive interference where coherent structures were the largest. Overall, the phase velocities increased with modal frequency, which coincided with the modal activity residing at higher portions of the cavity where the local mean flow velocity was elevated. Together, the TR-PIV and TR-PSP provide unique details not only on the distribution of modal activity throughout the cavity, but also new understanding of the resonance mechanism as observed in the velocity field.

VIA-2 electron velocity-field characteristics of GaAs and In0.53Ga0.47As below the Gunn effect threshold

1984 ◽  
Vol 31 (12) ◽  
pp. 1984-1985
Author(s):  
M.A. Haase ◽  
N. Tabatabaie ◽  
V.M. Robbins ◽  
G.E. Stillman
Keyword(s):  
Velocity Field ◽  
Electron Velocity ◽  
Gunn Effect
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