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Analytical Solution for a Problem of Directional Solidification in a Ternary System

100%
Alexandrov D., Ivanov A.
Acta Physica Polonica A
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2009
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vol. 115
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issue 4
786-790
EN
This paper is devoted to new analytic results relating to the nonstationary dynamics of directional solidification of ternary solutions with two moving layers of the phase transition lying between solid and liquid phases. Explicit analytical solutions of the problem under consideration are constructed on the basis of laboratory experiments carried out by Aitta, Huppert and Worster.
2
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Self-Similar Solidification of Binary Alloys

81%
Alexandrov D., Ivanov A., Malygin A.
Acta Physica Polonica A
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2009
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vol. 115
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issue 4
795-799
EN
The self-similar crystallization process of a binary mixture from a cooled boundary is studied on the basis of two models with a planar front and mushy layer. Approximate analytical solutions of the process describing the solidification with a mushy layer are found. The theory under consideration is in good agreement with experiments carried out by Huppert and Worster for ice growing from aqueous salt solutions.
3
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Ganglionic neuronal mechanisms involved in circulatory control system

81%
Skok V., Ivanov A., Tatarchenko L., Maslov V.
Acta Neurobiologiae Experimentalis
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1996
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vol. 56
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issue 1
107-115
EN
Intracellular tonic activity and responses to orthodromic stimuli were recorded from the neurones of rabbit superior cervical ganglion and compared with those recorded from the nerves containing pre- and postganglionic nerve fibres, with the use of coherent recording technique. It was found that: (1) firing of each ganglion neurone is triggered by two presynaptic inputs, single and multiple, formed by a single preganglionic nerve fibre whose discharges evoke the postsynaptic spikes correlated with cardiac rhythm, and by a few converging preganglionic nerve fibres which evoke the postsynaptic spikes, either correlated with cardiac rhythm or irregular, only if two or more of themdischarge together, correspondingly; (2) about 240 neurones of the ganglion, on the average, fire synchronously during their tonic activity, being driven by only three preganglionic nerve fibres; (3) only about 9% of a "neural unit", the number of the ganglion neurones receiving innervation from the same preganglionic nerve fibre, are discharged during their tonic activity through a single input, while the rest of neurones are either discharged through a multiple input (17%), or generate only the excitatory postsynaptic potentials subthreshold for spike generation (73%). The results obtained suggest that the ganglionic neuronal mechanisms responsible for vasomotor control involve much more complex ganglionic integrative processes then it has been commonly thought.
4
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Examination of Temperature Influence on Wide-Angle Paratellurite Crystal Acousto-Optic Filters Operation

71%
Mantsevich S., Korablev O., Kalinnikov Y., Ivanov A., Kiselev A.
Acta Physica Polonica A
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2015
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vol. 127
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issue 1
43-45
EN
The effect of temperature on a wide-angle paratellurite acousto-optic tunable filter is analyzed on the example of two different acousto-optic tunable filter configurations. The acousto-optic tunable filter operation was between -50°C to +40°C; also the survival of an acousto-optic tunable filter device at -130°C was demonstrated. The phase matching ultrasound frequency varies with temperature. We link this temperature shift to photoelastic characteristics of the TeO_{{2}}. A generalization is made for all wide-angle acousto-optic tunable filters based on TeO_{{2}} crystal. In addition, the temperature influence on the acoustic walk off angle was examined.
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