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The aim is to analyze transients in inter-aircraft navigation system with hierarchical timing that com.prises the sequential rank override that determines access sequence to a single com.munication channel. On the analysis of specific cases of changing the stru.cture of user connections (reconfigurations) refined rank calculation function and local synchronizing user select function at each step of work. As result the transients gain finiteness that provides the mobile units collaboration stability under the reconfiguration.

The paper is devoted to the development of an experimental device and methods for controlled ultrasound hyperthermia of animal tumors and to the estimation of a radiomodifying effect of ultrasound hyperthermia in radiation therapy of neoplasms as compared to the effect achieved in a water bath. Experiments were staged on mice with transplantable Ehrlich's carcinoma. Marked and approximately equal in value enhancement of radiation action on malignant tumors with the DMF of ionizing radiation of 1.3-1.4 was obtained with both methods of tumor heating (ultrasound and in a water bath). The results obtained indicate the advisability of a practical use of ultrasound heating in radiation therapy of tumors.

Experimental data obtained from studies of the effects of various structures of the animal eye on the transmission of focused ultrasonic beam are presented. Method based on the use of focused transducers as ultrasonic receivers, angle aperture of the receiver being equal (or more) to that of the radiator, is suggested to carry out remote measurements of spatial distribution of acoustic pressure inside the eye. It is shown that together with the movements of the radiator focus towards the eye centre the convergent beam defocuses while the maximum broadening of the central lobe of the acoustical pressure distribution function reaches 40-50% at the crystalline lens exit, while the peak intensity reduction is 40%. As a result the average intensity across the focal spot has become 3 times less. The effects observed are the result of the influence of the crystalline lens which has the properties of the effective acoustic dispersing lens.