A non-contact vibration measuring technique based on ultrasonic Doppler effect is studied. Two effects induce phase modulation on the received ultrasound signal, which are Doppler effect and nonlinear parametric effect. With the increasing of vibrating frequency, the phase variation due to parametric effect is getting greater and greater. In this paper, by measuring the acoustic pressure genera...

The transition to turbulence in boundary flow of superfluid 4He is investigated using a vibrating wire. An object in a superfluid is usually accompanied by remanent vortices, enabling to cause turbulence by its oscillation even at very low temperature. However, remanent vortices make it difficult to investigate the transition to turbulence. Recently, we have successfully devised a condition of ...

We study the power input of a vibrating wall into a fluidized granular medium, using event driven simulations of a model granular system. The system consists of inelastic hard disks contained between a stationary and a vibrating elastic wall, in the absence of gravity. Two scaling relations for the power input are found, both involving the pressure. The transition between the two occurs when wa...

We developed a new pseudo-attraction force display using four vibrating motors. The advantage of this device is that it uses phase difference control to alter the time width of pulses to generate asymmetric oscillation. It does not require altering the frequency of the vibrating motors. In this study, we investigated the influence of the pulse width generated in the device using vibrating motor...

We consider superposition states of various numbers of eigenstates in order to study vibrating quantum billiards semiquantally. We discuss the relationship between Galërkin methods, inertial manifolds, and partial differential equations such as nonlinear Schrödinger equations and Schrödinger equations with time-dependent boundary conditions. We then use a Galërkin approach to study vibrating qu...

BACKGROUND Fractional CO2 laser is an effective treatment for scars, but most patients complain about sharp burning pain, even after the application of lidocaine ointment. This study analyzed the impact of a vibrating device to nonpharmacologically reduce the acute pain of laser treatment, in accordance with the gate control theory of pain management. METHODS This is a prospective study perfo...

BACKGROUND This study was conducted to compare the efficiency of jet nebulizers, vibrating mesh nebulizers, and pressurized metered-dose inhalers (pMDI) during assisted and unassisted administration techniques using a simulated spontaneously breathing pediatric model with a tracheostomy tube (TT). METHODS An in vitro breathing model consisting of an uncuffed TT (4.5-mm inner diameter) was att...