Since direct evidence of transmission of propagated waves into the hepatic veins (liver pulse) has been lacking, pressure pulses were recorded in the hepatic vein of the anesthetized dog. A constant presystolic positive wave, amplified by venous congestion and pulmonic compression, is demonstrated and shown to be transmitted from the atrium. During tricuspid insufficiency, a second transmitted ...

Since very short pulse waves are transmitted, UWB systems have excellent accuracy in terms of distance measurement. In order to measure the distance between the terminals, the transmitted pulses have to be synchronized by a delay-lock-loop (DLL) in the receiver. In this paper the performance of the DLL is evaluated. Its performance depends the timing jitter between the local clocks of the termi...

Pressure waves in a granular material travel through particle contact points and are primarily transmitted by the "force chains" that carry most of the load in a granular medium. However, these force chains tend to be fragile and ephemeral and can be disrupted by very minor perturbations including the waves themselves. External vibration also disrupts the force chains and therefore also changes...

Optical communication links are usually made with erbium-doped fiber amplifiers, which amplify the signal waves in a phase-insensitive (PI) manner. They can also be made with parametric fiber amplifiers, in which the signal waves interact with idler waves. If information is transmitted using only the signals, parametric amplifiers are PI and their noise figures are comparable to those of erbium...

Numerical and experimental studies show that a wavepacket of internal gravity waves may be partially re ected from and transmitted into a region where the wave intrinsic frequency is comparable to the background buoyancy frequency. The departure of the propagation behaviour from that predicted by ray theory is examined in detail. In particular, weakly nonlinear e ects are shown to play a signi ...

When an ultrasonic wave is incident on a water/solid interface generally three waves are excited in the solid: one longitudinal and two shear. The complex amplitudes of the transmitted waves depend on the material properties and the angle of incidence. At incident angles higher than the first critical angle an evanescent longitudinal wave is excited near the surface. To satisfy the boundary con...

During an ultrasound scan, high frequency sound waves are produced by a transducer (the part of the machine which is placed on the body). The sound waves are passed into the body where they encounter structures (like your baby!). When this happens, the waves reflect back, and the sound (or echo) is detected electronically and transmitted onto a screen as a dot. This results in a picture being f...

We study the scattering of linear and nonlinear waves in a long waveguide array with a parity-time (PT )symmetric defect created by two waveguides with balanced gain and loss. We present exact solutions for the scattering of linear waves on such a defect, and then demonstrate numerically that the linear theory can describe, with a good accuracy, the soliton scattering in the case of weak nonlin...