Showing papers in "Ultrasonics in 1971"

TL;DR: In this article, a contactless plate wave excited in thin sheets (such as paper or cardboard) directly from air without touching the sample is described, which may prove to be useful in online testing of various other, non-woven materials like plastic sheets.

TL;DR: In this paper, a method of measuring ultrasound velocity to high accuracy in small samples of reasonably homogenous substances is described and results obtained with some body fluids and brain tumours are given.

TL;DR: The termperature-sensitive light-scattering properties of cholesteric liquid crystals have been applied to the mapping of the intensity distribution in the near-field of ultrasonic transducers.

TL;DR: Three applications of ultrasonics in dental research are described: a matter of simple visualisation of the subsurface structure, a method of studying the intermediate layer between the tooth and a restorative material, and the possibility of monitoring the dynamics of demineralisation at the tooth surface.

TL;DR: A significantly beneficial effect of ultrasound can be produced in plant material, but it is clear that the causes of, and inconsistencies in, the effect are barely understood.

TL;DR: Experiments show unmistakable decompression bubble echoes around fatty tissues in guinea pig legs, which disappear almost completely with recompression, proving Guinea pigs can be safely decompressed by keeping imaged bubble echoes below a threshold.

TL;DR: In this article, the rotor-stator interaction was studied theoretically, taking into account the effect of compressibility of fluid and the non-compact source distribution over the blades.

TL;DR: The use of elastic surface wave devices in modern radar and communications signal processing has been discussed in this article, where it is shown that the fabrication techniques involved are compatible with integrated microcircuit techniques so widespread in general microwave technology.

TL;DR: This device has been used to disperse the naturally occurring cell aggregates of Sarcina lutea and can be varied over a wide range to permit the choice of a force just sufficient to separate cells without otherwise affecting them.

TL;DR: A survey of methods for launching and detection of surface acoustic waves can be found in this article, where a detailed discussion is devoted to the applications of surface waves to electronic engineering, with particular emphasis on component design.

TL;DR: In this article, the effect of various ultrasonic fields on the yield and rate of three electrochemical processes of oxidation is ascertained, and some unexpected behaviour is reported, as well as definitive results.

TL;DR: In this article, the potentiality of a test for accelerated fatigue evaluation through an established high frequency effect was explored through a mechanically resonant system excited by a magnetostrictive transducer.

TL;DR: Ulasonic scanning of the abdomen has been proved a valuable supplement to radiographic and isotopic investigations and a new principle is outlined that employs the transcristal plane as a reference plane, and makes it possible to characterize all sectional planes.

TL;DR: In this paper, a transducer which generates a uniform axial and lateral intensity is described, which can be used to produce a focused field, by applying voltages which are 180° out of phase.

TL;DR: In this article, a derivation of the electromagnetic generation of compressional waves in metals in static magnetic fields is given, where it is found that the acoustic amplitude varies linearly with the amplitudes of both the incident time-varying electromagnetic field and the static magnetic field.

TL;DR: In this article, the results obtained in the measurement of ultrasound velocity and absorption coefficient in pigment suspensions merit an attempt to interpret the functional dependence of these ultrasonic properties on suspension concentration and dispersion degree.

TL;DR: Results of studies made during auditory stimulation of human subjects by pencil-tapping by ultrasonic intercranial measurements are presented, together with a discussion of the latest results.

TL;DR: In this paper, the authors describe two pieces of equipment designed to provide data on the elastic moduli and ultrasound velocities of steel at both sub-zero and elevated temperatures.

TL;DR: In this article, an extension of the matrix approach developed in Part 1 leads to multistage modulation systems of particular relevance to rapid scanning of a narrow beam over a wide sector.

TL;DR: In this paper, an experimental study of dispersed systems, particularly suspensions, is documented, and the results were obtained by an acoustic method having certain advantages over other tests, which was used with two interferometers working at ultrasonic frequencies as the main sources of information.

TL;DR: With the help of an ultrasonic equipment and a video-recorder, cerebral echo-pulsations are recorded and stored and it is possible to observe the behaviour of all echoes caused by brain-structures simultaneously.

TL;DR: This work has explored the possibility of improving the coupling of a sandwich transducer to the medium (water) by means of intermediate layers, to give a wide operating bandwidth.