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Okazaki, Japan

Patent
Showa University, Gc Corporation and Honda Electronics Co. | Date: 2012-07-11

This invention is achieved to provide a water-flow ultrasonic oral-cavity cleaning device and a method for water-flow ultrasonic oral-cavity cleaning for surely and efficiently cleaning an oral cavity. In the water-flow ultrasonic oral-cavity cleaning device


In global positioning system (GPS) satellites, the earth-centered locally inertial (ECI) coordinate system is used for calculations. We cannot use other reference frames, for example, one based on the solar system, in the calculation of GPS satellites because if the relative velocities in the solar system are used, large periodic orbital deviations of reference time are calculated. Therefore, the ECI coordinate system is a stationary gravitational frame. This fact provides experimental evidence for the ether-dragging hypothesis in which the ether is assumed to be the permittivity of free space ε0 and the permeability of free space μ0. This is interpreted using the analogy of an acoustic wave that is traveling in the atmosphere, which is dragged by the gravity of the earth. © 2010 Physics Essays Publication. Source


The Sagnac effect in global positioning system data provides experimental evidence that the group velocity is observed differently due to the velocity of the observer. The group velocity of the electromagnetic wave cG is observed differently depending on the observer's velocity v, as cG =c±v (c is the speed of light; + indicates that c and v are in the opposite direction). © 2010 Physics Essays Publication. Source


Toma M.,Nagoya University | Fukutomi S.,Nagoya University | Asakura Y.,Honda Electronics Co. | Koda S.,Nagoya University
Ultrasonics Sonochemistry | Year: 2011

It would seem that the economic viability is yet to be established for a great number of sonochemical processes, owning to their perfectible ultrasonic equipments. Industrial scale sonoreactors may become more important as a result of mastering the parameters with influence on their energy balance. This work related the solvent type to the energy efficiency as the first step of a complex study aiming to assess the energy balance of sonochemical reactors at 500 kHz. Quantitative measurements of ultrasonic power for water and 10 pure organic solvents were performed by calorimetry for a cylindrically shaped sonochemical reactor with a bottom mounted vibrating plate. It was found that the ultrasonic power is strongly related to the solvent, the energy conversion for organic liquids is half from that of water and there is a drop in energy efficiency for filling levels up to 250 mm organic solvents. Surface tension, viscosity and vapor pressure influence the energy conversion for organic solvents, but it is difficult explain these findings based on physical properties of solvents alone. The apparent intensity of the atomization process shows a good agreement with the experimentally determined values for energy conversion for water and the solvent group studied here. This study revealed that to attain the same ultrasonic power level, more electrical energy is need for organic solvents as compared to water. The energy balance equation has been defined based on these findings by considering an energy term for atomization. © 2010 Elsevier B.V. Source


An electromechanical transformation device comprises an alkaline niobate piezoelectric ceramic composition and a rigid body adhered onto the major surface of the piezoelectric ceramic composition. The piezoelectric ceramic composition is made of crystal structures such as orthorhombic crystals formed at the side where the temperature is lower than the orthorhombic-to-tetragonal phase transition temperature, tetragonal crystals formed at the side where the temperature is higher than the orthorhombic-to-tetragonal phase transition temperature as well as at the side where the temperature is lower than the tetragonal-to-cubic phase transition temperature, and the cubic crystals formed at the side where the temperature is higher than the tetragonal-to-cubic phase transition temperature. Youngs modulus of the rigid body is 60 GPa or more and the volume percent of the piezoelectric ceramic composition existing within a range where the distance from the adhesion point of the piezoelectric ceramic composition and the rigid body is 40% or more.

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