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Boeskorov G.G.,Russian Academy of Sciences | Nogovitsyn P.R.,Oi Secondary School | Mashchenko E.N.,Russian Academy of Sciences | Belolyubsky I.N.,Russian Academy of Sciences | And 6 more authors.
Doklady Earth Sciences | Year: 2016

This paper considers the data on new findings of mammoth fauna remains in the Middle Lena basin used to specify the species composition of large Late Neopleistocene mammals represented by eleven species. The obtained range of radiocarbon dates made it possible to state that mass burials of Pleistocene mammal remains were formed in the region during the Karginsk Interstadial (24 000–55 000 years ago). © 2016, Pleiades Publishing, Ltd.


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.


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.


Boeskorov G.G.,Russian Academy of Sciences | Mashchenko E.N.,Russian Academy of Sciences | Plotnikov V.V.,Academy of science of the Republic of Sakha Yakutia | Shchelchkova M.V.,Ammosov Northeastern Federal University | And 2 more authors.
Contemporary Problems of Ecology | Year: 2016

An analysis of the available data on the various adaptations of the woolly mammoth to the cryoarid conditions of the Ice Age is presented. Mammuthus primigenius had a set of specific anatomic–morphological (thick long three-row wool, small ears, a short tail, an adipose “hump”, a “hood”-like extension on the trunk, and wide soles of the feet) and physiological (reduced sensitivity to cold and a specific kind of lipid metabolism) ideoadaptations that provided safe existence and wide distribution of this species in the Northern Holarctic for a long time. The current data make it possible to refer the woolly mammoth to a highly specialized species of the Mammoth biome. © 2016, Pleiades Publishing, Ltd.


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.


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.


Fridovsky V.Y.,Russian Academy of Sciences | Gamyanin G.N.,RAS Institute of Geology and Mineralogy | Polufuntikova L.I.,Ammosov Northeastern Federal University
Russian Journal of Pacific Geology | Year: 2015

Detailed structural study of ore zones and deformations in host rocks reveals the multistage tectonic evolution of the Malo-Taryn ore field. Gold–quartz mineralization is confined to the interstratal and longitudinal thrust faults, where vein–stringer bodies are systematically oriented relative to the structures of the thrust stage. Antimony mineralization is superposed on gold–quartz mineralization in the same structures, being associated with veins formed during the shear stage of deformations. It is determined that the types of mineralization were formed in the following sequence: gold–bismuth, low-sulfide gold–quartz, berthierite–antimonite, and silver–antimony. Data on mineral assemblages and typomorphic features of minerals are reported. The isotope composition of minerals, temperature conditions, and composition of orebearing fluids are studied. It is established that the same minerals ascribed to different types of mineralization sharply differ in typomorphic features, which is caused by the different composition and genesis of the hydrothermal fluids. The superposition of different types of mineralization on one another within repeatedly activated tectonic structures that were fluid-permeable for a long time is an important indication of large-scale deposits. © 2015, Pleiades Publishing, Ltd.


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.


Kirillina Y.V.,Ammosov Northeastern Federal University | Lazareva N.N.,Ammosov Northeastern Federal University | Sleptsova S.A.,Ammosov Northeastern Federal University | Okhlopkova A.A.,Ammosov Northeastern Federal University
Polymer Science - Series A | Year: 2016

The physicomechanical and triboengineering properties and the structures of polymer composite materials based on polytetrafluoroethylene and layered silicates are studied. The triboengineering characteristics are substantially improved by the introduction of a small amount of layered silicates (2–5 wt %). It is found that the introduction of organomodified layered silicates leads to a considerable reduction in the friction coefficient, by an order of magnitude, and causes an increase in wear resistance (2000-fold). With the use of X-ray structural analysis and scanning electron microscopy, it is shown that, during friction loading, filler particles are localized on the friction surface, thereby hampering wear of the material. © 2016, Pleiades Publishing, Ltd.


PubMed | Ammosov Northeastern Federal University
Type: Case Reports | Journal: Morfologiia (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.

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