A method is described for comparing the sensitivity of two hydrophones over the frequency range 1-15 MHz. This technique forms the basis for the dissemination of national ultrasonic standards in the U.K. over this frequency range. A reference hydrophone is placed in an ultrasonic field and then the device being calibrated is substituted and the two output voltages are compared. This substitutio...

Flavonoids, are a large class of polyphenols, with more than 4000 combinations. They have an antioxidant role in plant photosynthesis and in the human body they optimally act as an antioxidant, anti-inflammatory, anticancer and protector of the heart. Quercetin is in the flavonol group that is used to fight protection specifically against viruses and cancer cells. In this study, Comparison of e...

When the high power ultrasound irradiates the liquid, small liquid droplets are generated from the liquid surface. This phenomenon is called as ultrasonic atomization [1]. Recently, it has been reported that ethanol is concentrated from the aqueous solution by ultrasonic atomization [2-4]. Since ultrasonic atomization scarcely accompanies the phase change, this is a great advantage comparing wi...

An in situ ultrasonic angle beam method has been developed to detect and size fatigue cracks emanating from fastener holes. The method employs transducers mounted in a pitch-catch configuration on each side of the hole, and the modulation of received signals with load is used to detect and size small fatigue cracks. The focus of this paper is the monitoring of a series of critical fastener hole...

Increasing number of ultrasonic applications reflects the potential of this method. As broader is the range of areas involved in ultrasonic measurement, the more essential becomes the question of a universal concept of the equipment for generating and acquiring the ultrasonic data. Ideas and problems met here we would like to share in this publication. The ultrasonic non-destructive evaluation ...

The properties of ultrasonic creeping wave were stated. Experimentations on the rabbet of aeroengine turbine blade were applied with ultrasonic creeping wave testing. The result indicates that the creeping testing method is feasible to inspect the rabbet of turbine blade in situ.

This paper describes a low-cost ultrasonic fusion system for angular position. It makes use of two omnidirectional microphones together with one ultrasonic transmitter. The system enables the determination of the transmitter with respect to the two omni-directional microphones. The technique used for the estimation of the incident angle è is the sum-and-difference monopulse method.

Percutaneous renal biopsy is a fundamental diagnostic technique in clinical nephrology. Since its introduction in 1951 [1], there have been several descriptions of the technique with refinements of the procedure, more recently employing ultrasonic guidance [2—101. The technique described in this paper is a biopsy method employing real-time ultrasonic guidance and a semiautomated, spring-loaded ...

the effect of mixing on rheological behavior of 6% wt epoxy-clay nanocomposites was studied. the mixing processes were carried out by low shear mixer, homogenizer and ultrasonic and combination of different mixing techniques at medium and maximum power. all these methods led to intercalated structure. the xrd results showed that the ultrasonic has the best effect on dispersion while a low shear...