Anisotropic ultrasonic properties of a nematic liquid crystal

ABSTRACTS The abstracts survey, a regular feature of each issue of ULTRASONICS, contains recent patent information and reports of new literature in the field. Copies of original articles are best obtained by writing to the journal in which they appeared. The addresses of such journals can be found in reference books such as ‘World List of Scientific and Technical Publications’, ‘Willings Press Guide’, ‘Newspaper Press Directory’, or (for American journals) ‘Ayers’. Transducer assembly for producing ultrasonic vibrations Joyner, B. L., Anderson, J. W., Heny, S. L. (Linden Laboratories Inc) Canadian Patent 813,502 (1970) The transducer, marketed under trade name BAR Transducer, incorporates a ceramic piezoelectric element, and is housed to have a high degree of physical integrity and is subject to less breakage. Its intended usage is in ultrasonic cleaning apparatus, but it has applications in underwater and medical devices. Piezoelectric transducer for ultrasonic Heny, S. L. (Linden Laboratories Inc) US Patent 3,441,754 (1970)

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The transducer uses certain materials to relieve some of the stresses normally set up in the assembly of a polycrystalline ceramic piezoelectric element. Hall effect transducer gives electrical output proportional to meter shaft rotation NASA Tech Brief ‘IO-10298 June (1970) Aconstoelectric current saturation due to off-axis shear waves Huber, J. C. Appl Phys Letters (USA), Vol 16, No 11 (June 1970) pp 458-459 Enhancement of the piezoelectrically-stiffened ultrasonic velocity by electron trapping in CdS Krischer, C., Ingard, U. Phys Letters A (Netherlands), Vol 32, No 1 (June 1970) pp 41-42 Anisotropic ultrasonic properties of a nematic liquid crystal Lord, A. E. et al Physical Review Letters, Vol 25, No 9 (August 1970) p 570 Phonon dispersion in CsBr Daubert, J. Physics Letters, Vol 32a, No 6 (August 1970)’ p 437 Refraction and reflection of ultrasonic surface waves by thin-gold-film layers on lithium niobate substrates Pedinoff, M. W., Walder, M. Electronics Letters (GB), Vol 6, No 17 (August 1970) pp 533-534 Attenuation of dispersive Rayleigh waves on quartz Cambon, G., Rouzeyre, M. Electronics Letters (GB), Vol 6, No 17 (August 1970) pp 539-541 62

ULTRASONICS January 1971

Absorption of ultrasQund in semiconducting compounds gallium arsenide, gallium antimonide, indium arsenide, indium antimonide Bobylev, B. A., Kravchenko, A. F. Soviet Physics-Acoustics, Vol 16, No 1 (JulySeptember 1970) pp 13-16 Comparison of the properties of transducers made from different magnetostrictive materials Valuev, V. N., Ganeva, L. I., Golyamina, I. P. Soviet Physics-Acoustics, Vol 16, No 1 (JulySeptember 1970) pp 26-29 Amplification of Rayleigh waves in gallium arsenide crystals Viktorov, I. A. Soviet Physics-Acoustics, Vol 16, no 1 (JulySeptember 1970) pp 30-33 Analysis of a cylindrical piezoceramic transducer radially symmetric modes Dianov,D. B., Kuzmenko,A. G. Soviet Physics-Acoustics, Vol 16, No 1 (JulySeptember 1970) pp 24-38

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Efficiency of high frequency ultrasonic concentrators Kanevskii, I. N. Soviet Physics-Acoustics, Vol 16, No 1 (JulySeptember 1970) pp 64-68 Scattering of elastic normal modes in a plate with a two-dimensional surface roughness distribution Merkulov, L. G., Firsov, I. P. Soviet Physics-Acoustics, Vol 16, No 1 (JulySeptember 1970) pp 86-90 Absorption of ultrasonic waves in aqueous solutions of biopolymers Sadykhova, S. Kh., El’piner, I. E. Soviet Physics-Acoustics, Vol 16, No 1 (JulySeptember 1970) pp 101-107 Ultrasonic synchronisation of laser emission Belova, G. N. Soviet Physics-Acoustics, Vol 16, No 1 (JulySeptember 1970) pp 110-112 Sonoluminescence of aqueous solutions of sucrose and glycerin Golubnichii, P. I., Goncharov, V. D., Protopopov, Kh. V. Soviet Physics-Acoustics, Vol 16, No 1 (JulySeptember 1970) pp 115-117