The laws of reflection and refraction are typically derived using a dispersion relation that assumes that the angular frequency stays the same across a vacuum–dielectric interface and that the angular wave number increases. At the single photon level, this means that the total energy of the photon is conserved but the linear momentum is not. Here I derive the laws of reflection and refraction f...

To investigate the frequency-dependent changes of lung tissue mechanics during pneumoconstriction, we studied guinea pig subpleural lung strips submitted to a multisinusoidal deformation composed of five equal-amplitude discrete frequencies ranging between 0.2 and 3.1 Hz. Strips were submitted to graded step stretch changes (SS) and to graded histamine stimulation (HS) in organ bath. Elastance,...

The discrimination of the scattered wave from an object buried in shallow ground from that of the rough surface is a difficult task with present ground penetrating radar (GPR) systems. Recently, a new approach for this classical problem has been proposed and its effectiveness has been verified. This new method is based on the angular correlation function (ACF) of the scattered wave observed at ...

We describe the effects of weak gravitational lensing by cosmological large scale structure on the diffuse emission of 21 centimeter radiation from neutral hydrogen at high redshifts during the era of reionization. The ability to observe radial information through the frequency, and thus threedimensional regions of the background radiation at different redshifts, suggests that 21 cm studies may...

The vestibular semicircular canals respond to angular acceleration that is integrated to angular velocity by the biofluid mechanics of the canals and is the primary origin of afferent responses encoding velocity. Surprisingly, some afferents actually report angular acceleration. Our data indicate that hair-cell/afferent synapses introduce a mathematical derivative in these afferents that partia...