Results 141 to 150 of about 16,466,590 (349)

Photoacoustic group velocity

open access: yesPhysica Scripta
Abstract The concept of photoacoustic (PA) group velocity ( v g ) is largely missed in the related transport theory. Generally it is assumed that the PA signal propagation occurs at a constant velocity, and thus
C García-Segundo   +3 more
openaire   +1 more source

THE VELOCITY FIELD AROUND GROUPS OF GALAXIES [PDF]

open access: yesThe Astronomical Journal, 2011
accepted for publication in the Astronomical ...
openaire   +2 more sources

Effectiveness of rTMS on Working Memory and Inhibitory Impairments in Patients With Post‐Stroke Executive Deficits

open access: yesAnnals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Considerable efforts have been dedicated to developing effective treatments for post‐stroke executive impairment (PSEI), among which repetitive transcranial magnetic stimulation (rTMS) has shown great potential. This study aimed to investigate the therapeutic effects of high‐frequency rTMS on working memory (WM) and response ...
Mengting Lao   +6 more
wiley   +1 more source

The Global Velocity Curve 1952-1982 [PDF]

open access: yes
This paper provides evidence and an explanation for an empirical regularity in the income velocity of money. Based on a cross country comparison in the post World War II period of 84 countries arrayed from very low to very high per capita income ...
Michael D. Bordo, Lars Jonung
core  

Phase and group velocity matching for cumulative harmonic generation in Lamb waves

open access: yes, 2011
Owing to the enhanced sensitivity of nonlinear acoustic methods to material damage, the nonlinear Lamb wave propagation is pertinent to the nondestructive evaluation of platelike structures, and it is typically manifested as generation of higher ...
N. Matsuda, S. Biwa
semanticscholar   +1 more source

Advancing Age Modulates Associations Between Cognitive Impairment and Brain Volumes in Early MS

open access: yesAnnals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Introduction Cognitive impairment is common in multiple sclerosis (MS), but manifestations following the first demyelinating event are relatively unexplored. We investigated cross‐sectional associations between magnetic resonance imaging (MRI)–derived brain volumes and the presence of cognitive impairment outcomes five years after the first ...
Piriyankan Ananthavarathan   +14 more
wiley   +1 more source

Signal velocity and group velocity for an optical pulse propagating through a GaAs cavity

open access: yes, 2003
We present measurements of the signal and group velocities for chirped optical pulses propagating through a GaAs cavity. The signal velocity is based on a specified signal-to-noise ratio at the detector.
BERTOLOTTI, Mario   +6 more
core   +2 more sources

Analysis of dispersion characteristics in helically corrugated coaxial waveguides: a theoretical and comparative study

open access: yesNew Journal of Physics
Helically corrugated waveguides are valuable for constructing high-performance gyrotron devices and high-power pulse compressors. This paper establishes a theoretical model to analyze the dispersion characteristics of helically corrugated coaxial ...
Ying Xin Lai   +4 more
doaj   +1 more source

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