Results 161 to 170 of about 407,723 (180)
Some of the next articles are maybe not open access.
Dispersion in developing velocity fields
AIChE Journal, 1968AbstractConvective diffusion in laminar flows which develop from rest and in the velocity entrance region of tubes, is studied. Criteria for the validity of the simple dispersion model are established by comparison of analytical results with numerical experiments.It is found that the extent of dispersion is less in developing velocity fields than in ...
William N. Gill +2 more
openaire +1 more source
Velocity dispersions across bulge types
AIP Conference Proceedings, 2010We present first results from a long‐slit spectroscopic survey of bulge kinematics in local spiral galaxies. Our optical spectra were obtained at the Hobby‐Eberly Telescope with the LRS spectrograph and have a velocity resolution of 45 km/s (σ*), which allows us to resolve the velocity dispersions in the bulge regions of most objects in our sample.
Fabricius, M. +5 more
openaire +3 more sources
VELOCITY DISPERSION OF SEISMIC WAVES*
Geophysical Prospecting, 1971SummaryIn well velocity surveys made to calibrate Sonic (CV) Logs the calibration survey uses frequencies around 50 Hz whereas the Sonic Logging tool uses frequencies around 20 kHz. There thus exists the possibility of making a direct measure of velocity dispersion. In any one survey the disturbing factors, both instrumental and operational, will often
P. N. S. O'BRIEN, A. L. LUCAS
openaire +1 more source
Ultrasonic velocity dispersion in methylcyclohexane
Pramana, 1974Ultrasonic velocity dispersion in methylcyclohexane was studied in the frequency range of 0.5 to 5.0 MHz at 60°, 65°, 70°, 75° and 80°C using a variable path interferometer. Necessary corrections for the diffraction of the ultrasonic beam were applied.
E Rajagopal, S V Subrahmanyam
openaire +1 more source
Normal group-velocity dispersion Kerr frequency comb
Optics Letters, 2011We show via numerical simulation that Kerr frequency combs can be generated in a nonlinear resonator characterized with normal group-velocity dispersion. We find the spectral shape of the comb and temporal envelope of the corresponding optical pulses formed in the resonator.
A B, Matsko, A A, Savchenkov, L, Maleki
openaire +2 more sources
Velocity dispersion in Brillouin scattering
Canadian Journal of Physics, 1969The dispersion relations for the velocity v for temporally absorbed hypersonic waves and for the velocity vB as determined from the positions of the Doppler-shifted Brillouin peaks are discussed for a single relaxation process. The difference between v and vB is significant whenever the sound absorption per cycle is not much smaller than unity.
A. B. Bhatia, E. Tong
openaire +1 more source
Tuning group-velocity dispersion by optical force
Optics Letters, 2013We propose an optomechanical approach for dispersion dynamic tuning and microengineering by taking advantage of the optical force in nano-optomechanical structures. Simulations of a suspended coupled silicon waveguide show that the zero-dispersion wavelength can be tuned by 40 nm by an optical pump power of 3 mW.
Wei C, Jiang, Qiang, Lin
openaire +2 more sources
Group velocity dispersion in asymmetric slab guide
Applied Optics, 1989Calcul de la dispersion de la vitesse de groupe dans les guides d'onde multicouches asymetriques a fort ...
A, Dienes, Y, Peng, A, Knoesen
openaire +2 more sources
Group-velocity dispersion in photonic crystal fibers
Optics Letters, 1998The dispersion properties of photonic crystal fibers are calculated by expression of the modal field as a sum of localized orthogonal functions. Even simple designs of these fibers can yield zero dispersion at wavelengths shorter than 1.27 mum when the fibers are single mode, or a large normal dispersion that is suitable for dispersion compensation at ...
D, Mogilevtsev, T A, Birks, P S, Russell
openaire +2 more sources
Pulse Dispersion and Pulse Velocity
1996Any physically consistent setting up of a pulse problem should incorporate three basic components: a source of the perturbation, a medium of propagation and a receiver spatially separated from the source. To obtain a reproducible experiment one should eliminate all other sources of perturbations, and initiate the signal in the medium at rest at a ...
Mark Kelbert, Igor Sazonov
openaire +1 more source