Acoustical behaviour of dolphins

Echo sounding for fish Electroacoustic GmbH British Patent 1, 136, 832 (18 December 1968) A method is described for recording echo signals from small shoals of fish so that on a chart the fish are shown black and sea-bed grey. Lobsters resting on the sea-bed can be clearly distinguished. Use is made of electrically sensitive paper (carbon paper covered with a light-coloured non-conducting layer) and the technique involves modifying the signal circuit so that more of the lightcoloured layer is burnt away by the charged stylus when fish are present than when not. (1432) Effect of ultrasound on the canine mitral valve Reeves. M. M.. et al Medical Research Engineering (March-April, 1969) oo 16.17 Production of chronic valvular changes closely mimicking those seen in human rheumatic carditis was performed by means of ultrasound. A solid 7075-T6 aluminium alloy concentrating horn with a 12 - by 1 -cm tip was introduced by closed technique through the left auricular appendage. Ultrasound with a dosage of 1MHz at 5W/cm2 was applied directly to the mitral valve for 5-20 min. By this method approximately 50% of the animals developed significant mitral lesions and congestive heart failure of varying degrees. Characteristic systolic murmurs with angio-cardiographic evidences of valvular insufficiency appeared between the third and thirty-sixth day, with a mean of twelve days. (1433) Effects of intense noncavitating ultrasound on selected enzymes Dunn. F.. Macleod. R. M. JASA, VA1 44, No 4 (October 1968) p 392 (1434) High-frequency ultrasonic properties of freshwater fish tissue Freese, M., Makow, D. Journal of the Acoustical Society of America, Vol 44, No 5 (November 1968) pp 1282-1290 (1435) Electrical stimulation of brain localized without probes--theoretical analysis of a proposed method (Use of ultrasonic field of ac current flowing in the brain) Fry, W. J. JASA, Vol 44, No 4 (October 1968) p 919 (1436) Improvements in the measurement of interocular distances using ultrasound Gigliv, E. J., Ludlam, W. M., Wittenburg, S. Journal of the Acoustical Society of America, Vol 44, No 5 (November 1968) pp 1395-1365 (1431) Transducer alignment device for A-scan echoencephalography Hudson, A. C., Trollpe, B. J. Journal of the Acoustical Society of America, Vol 44, No 5 (November 1968) p 1353-1359 (1438) Some biophysical aspects of ultrasound Peacocke, A. R., Pritchard, N. J. Progress in Biophysics and Molecular Biology, Vol 18 (1968) pp 185-208 (1439) Evaluation of intensity-modulated recording for ultrasonic diagnosis Reid, J. M. Journal of the Acoustical Society of America, Vol 44, No 5 (November 1968) pp 1319-1324 (1440)

Clinical application of diagnostic ultrasound in obstetrics and gynecology Thompson, H. E. Journal of the Acoustical Society of America, Vol 44, No 5 (November 1968) pp 1365-1373 (1442)

Propagation of sound pulses in a homogeneous layer under a inhomogeneous half space Sharma, M. P. Proceedings of Indian Academy of Sciences A, Vol 68, No 3 (September 1968) pp 131-148 (1456)

Effect of the skull in degrading the display of the echoencephalographic band C-scans White, D. N., et al Journal of the Acoustical Society of America, Vol 44, No 5 (November 1968) pp 1339-1346 (1443)

Microwave photons (Experimental observations using coherent acoustic waves near 1010 Hz are described. Deeper insight is provided into crystallographic phenomena.) Stevens, K. W. H. The Radio and Electronic Engineer, Vol 36, No 6, (December 1968) p 341 (1457)

Physics Propagation of sound waves in a liquid during cavitation Bogushavskii, Y. Y. Soviet Physics-Acoustics, Vol 14, No 2 (October-December 1968) pp 151-154 (1444) Surface wave propagation in crystalline quartz Daniel, M. R., de Klerk, J., Jones, C. K., Patterson, A. IEEE Transactions on Sonics and Ultrasonics, Vol SW-16, No 1 (January 1969) p 23 (1445) The present and future of ultrasonic imaging Ensminger, D. Battelle Technical Review, Vol 17, No 10 (November-December 1968) pp 3-8 (1446) Sound propagation in an inhomogeneous medium Gitis, M. B., Romanov, V. P. Soviet Physics-Acoustics, Vol 14, No 4 (April-June 1969) pp 511-512 (1447) Surface waves in intrinsic semiconductors Hervonet. C. Physics Letters, Vol 28A, No 8 (27 January 1969) pp 578-5’79 (1448) Investigation of method for the excitation normal modes in plates Kaekina, T. M. Soviet Physics-Acoustics, Vol 14, No 4 (April-June 1969) pp 456-460 (1449)

Surface waves of the spin-elastic type in a discrete lxx& of cubic structure Kaliski, S., Kapelewski, J. Proceedings of Vibration Problems, Vol 9. No 3 (1968) pp 26’7-278 (1450) Sound transmission through a piezoelectric semiconducting plate in a liquid Lyanshev, L. M. Soviet Physics-Acoustics, Vol 14, No 3 (January-March 1969) pp 401-402 (1451) Sound scattering by a slender piezoelectric semiconducting rod Lyanshev, L. M., Chernova, V.A. Soviet Physics-Acoustics, Vol 14, No 4 (April-June 1969) pp 515-516 (1452) Phonons Mansfield, R. Physics Education, 1969) p 44 (1453)

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behaviour of dolphins E. the 6th International Congress on Vol 6, f1969), pp M29-M32 (1441)

ULTRASONICS

July

1969

Vol 14, No 1, (January

Propagation of phonons in magnesium fluoride (Low and room temperatures) McCarthy. K. A.. Gibson. J. J.. and Cutler. H.R. -’ ’ IEEE Transactions on Sonics and Ultrasonics, Vol SU-16, No 1 (January 1969) pp 27-28 (1454) Ultrasonic waves propagation in suspensions and emulsions. Part I. Investigation on and pigment suspensions by the acoustical method Peotrovska, S. Roejniki Chemii, Vol 43, No 1 (1969) pp 161172 (In Polish, English abstract) (1455)

emulsions Acoustical Shishkova, Reports of Acoustics,

of

(Elastic) wave transmission system Western Electric Co Inc (USA) Japanese Patent JPC 7855/‘69 (14 April (Applied for 23 November 1964) (1458)

1969)

plastic and thermal waves in solid at hypersonic frequencies Weymann, H. D. Physical Review, Vol 176, No 3 (15 December 1968) p 838 (1459) Surface waves in CdS crystals with allowance for the piezoslectric effects Zubova, 0. M. Soviet Physics--Acoustics, Vol 14, No 3 (January-March 1969) pp 399-400 (1460) From the council on ultrasonic physics and engineering (Meeting report but useful references are made to several papers and authors on ultrasonic works) Soviet Physics-Acoustics, Vol 14, No 3 (January-March 1969) p 407 (1461)

Sound velocity, attenuation and properties of materials Measurement of the elastic constant of ceramics by resonant frequency methods Davis, W. R. Transactions of the British Ceramic Society, Vol 67. (November 1968) pp 515-541 After an introduction on the general experimental techniques and equipment involved in the excitation and detection of vibration the author considers longitudinal, tortional and flexural resonances in detail. Corrected formula for the moduli of elasticity (E) and rigidity (G) are described taking into account the Poisson contraction (both for a rod and a rectangular bar) and the techniques for a variety of specimen geometries are given in detail (from 40 x 2. 5 x 2. 5mm to rods 250mm long and bars with cross-sections up to 40 x 15mm). The methods are compared in tabular form and results are also given for some high purity materials (such as Alumina) and for Porcelin and various refractory products. (1462) On the connection between the static and dynamic elasticity moduli of concrete Facaoaru. I., Starnate. G. H. Revista constructiilor si a materialelor de constructii. Vol 20 No 2 (February 1968) pp 100-110 The authors firstly define the dynamic elasticity modulus (as the modulus obtained by means of applying very small loads with wry great frequency, corresponding to those loadings which, for instance propagation of supersounds produces in the propagation medium), and the static one (which is the ratio of the variation of unit stress and the specific deformation around a point of the characteristic curve). Then, nondestroying tests by means of supersounds, and tests effected by means of press loadings on prisms made of specially thickened concrete are presented; these tests were effected in order to determine the correlation between the defined moduli. Research was carried out for compression and flexion stresses. On that basis, the values of the correlation factor between the dynamic and static elas-