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Buzinaeva M.T.,Ammosov Northeastern Federal University
Morfologii{combining double inverted breve}a (Saint Petersburg, Russia) | Year: 2013

Using histological, morphometric and immunnohistochemical methods, cellular composition and cytoarchitectonics of diffuse lymphoid tissue in the mucous membrane of the larynx was studied in 29 men aged 17-74 years, who died from general body hypothermia in the winter period and in 27 men who died from mechanical injury during the summer. Significant changes in the cellular composition of diffuse lymphoid tissue of the mucous membrane in the various parts of the larynx were detected in fatal hypothermia, which included the decrease in the number of T-, B-lymphocytes and plasma cells and the increase in the number of macrophages in all age groups, indicating the suppression of local immunity in persons who died due to the action of low temperature.

Anufriev A.I.,Russian Academy of Sciences | Okhlopkov I.M.,Ammosov Northeastern Federal University
Russian Journal of Ecology | Year: 2015

Materials are presented on the hibernation of three species of squirrel with a body temperature below zero at relatively low temperatures of the environment (down to −10 to −12°C). DS-1922 L temperature loggers were implanted in the body cavity of parka squirrels, long-tailed ground squirrels, and black-capped marmots before the period of hibernation, in August. After the implantation, the temperature loggers were kept in the body cavity of the animals during their winter hibernation and removed at the end of April. During the period of hypothermia, a body temperature below zero was recorded: in parka squirrels it was observed during 5 months, the minimum temperature was −2°C; in long-tailed ground squirrels it was observed during 6 months and the minimum temperature was −2°C; and in black-capped marmots it was observed during 4 months and the minimum temperature was −1°C. © 2015, Pleiades Publishing, Ltd.

Morozov A.V.,Russian Academy of Sciences | Petrova N.N.,Ammosov Northeastern Federal University
Journal of Friction and Wear | Year: 2016

The results of an experimental study of the effect of the normal pressure in the range of 0.1–0.3MPa, a velocity of sliding of 1–100 mm/s, and a bulk temperature of 22 to–27°C on the coefficient of sliding friction of an elastomer–steel friction pair have been presented. Two types of elastomeric materials have been considered, i.e., frost-resistant rubber based on synthetic propylene oxide rubber and this rubber filled with the antifriction additive of ultrafine polytetrafluoroethylene powder in an amount of 1 weight part per 100 weight parts. The results have shown the efficiency of filling rubbers with ultrafine polytetrafluoroethylene; the coefficient of sliding friction at temperatures below–15°C decreases by more than two times. © 2016, Allerton Press, Inc.

Okhlopkova A.A.,Ammosov Northeastern Federal University | Vasil'ev S.V.,Russian Academy of Sciences | Petrova P.N.,Russian Academy of Sciences | Gogoleva O.V.,Russian Academy of Sciences
Russian Engineering Research | Year: 2016

The properties of basalt-reinforced polymers based on polytetrafluoroethylene are investigated as a function of the concentration of basalt fibers and their activation conditions. A high-speed planetary mill may effectively be used for the activation of the basalt fibers. © 2016, Allerton Press, Inc.

Moiseyev A.V.,Russian Academy of Sciences | Popov V.I.,Ammosov Northeastern Federal University | Mullayarov V.A.,Russian Academy of Sciences | Samsonov S.N.,Russian Academy of Sciences | And 2 more authors.
Cosmic Research | Year: 2015

The space–time characteristics of geomagnetic pulsations during a sudden impulse on August 4, 2010 have been analyzed using ground-based and satellite observations. It has been indicated that two types of geomagnetic pulsations with different spatial extensions, oscillation frequencies, and generations were observed at that time. It has been found that geomagnetic pulsations with identical oscillation frequencies (∼4.5 mHz) at different latitudes were observed, with a maximal amplitude in the dusk sector. Oscillations with close frequencies were registered in the solar wind in the IMF Bz component. Higher-frequency (7–10 mHz) pulsations dependent on latitude were registered on the dawn side. It is assumed that geomagnetic pulsations with frequencies of ∼4.5 mHz were caused by oscillations penetrating from the interplanetary medium, and higher-frequency pulsations were Alfvén resonance oscillations generated during the compression of the magnetosphere. An asymmetric oscillation amplitude distribution relative to noon was caused by the IMF orthospiral orientation in this event. © 2015, Pleiades Publishing, Ltd.

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