Syktyvkar, Russia

Syktyvkar State University
Syktyvkar, Russia

Syktyvkar State University is the principal university in Syktyvkar, the capital of the Komi Republic in Russia. It was founded in 1972 and has over 3,500 full-time students and 250 faculty members.During the fall and winter 2007-2008, Syktyvkar State University was selected to host the Associate Regional Office of Undergraduate Studies for Russia of the University of the Arctic.The university is associated with the Russian Mineralogical Society.The Huazhong University of Science & Technology rates the university as 98th among Russian universities.In March 2009 the university established the Sorokin Research Center to undertake research and publication of archive materials on the sociologist Pitirim Sorokin from international sources, mainly from the Sorokin's special collection at the University of Saskatchewan in Canada. Wikipedia.

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Belykh D.V.,Syktyvkar State University | Ashikhmina E.V.,RAS Institute of Chemistry
Macroheterocycles | Year: 2014

The exocyclic ring of methylpheophorbide a{cyrillic} was subjected to hydroxymethylation under Tollens reaction conditions. Some distinctions of the stereochemistry of this reaction were observed, compared to other condensation reactions involving this exocyclic ring. © ISUCT Publishing.

Stolypko A.L.,Syktyvkar State University
Instruments and Experimental Techniques | Year: 2013

A simple digital magnetic stabilizer with relative stabilization of no worse than 1 × 10-6/day is described. © 2013 Pleiades Publishing, Inc.

Belyayev Y.N.,Syktyvkar State University
Proceedings of the International Conference Days on Diffraction, DD 2012 | Year: 2012

Symmetric polynomials of n-th order are defined by the recurrence formulas as a functions of elementary symmetric polynomials of n-th order matrix. The method of symmetric polynomials (MSP) is developed with respect to the calculation of the transfer matrix of waves in layered media. MSP, in contrast to the Lagrange-Sylvester method does not require the computation of eigenvalues of the matrix. The algorithm of numerical calculation of the transfer matrix for layered structures is proposed. Analytical solutions for some of the transfer matrices of second and fourth order for a homogeneous layer and periodic layered structures are found. © 2012 IEEE.

Shushpannikova G.S.,Syktyvkar State University
Russian Journal of Ecology | Year: 2014

Transformation of meadow communities under the impact of hay harvesting and livestock grazing has been studied in the floodplains of the Vychegda and Pechora rivers. Changes in the floristic composition, structure, and productivity of meadows have been evaluated using synanthropization and adventization indices. On this basis, meadow phytocenoses at three different stages of pasture digression have been distinguished. © 2014 Pleiades Publishing, Ltd.

Belyayev Y.N.,Syktyvkar State University
Proceedings of the International Conference Days on Diffraction 2013, DD 2013 | Year: 2013

The new method of the matrix exponential exp (Wz) computation is based on the use of symmetric polynomials of n-th order in combination with scaling matrix W. Calculation algorithm uses a new type of recurrence relations, which were obtained for symmetric polynomials. Evaluation of the scaling parameter, which provides a reliable calculation of the matrix exponential with admissible truncation error, is made. Method of minimizing roundoff errors in the calculation of high powers of matrices is suggested. © 2013 IEEE.

Belyayev Y.N.,Syktyvkar State University
Proceedings of the International Conference Days on Diffraction 2015, DD 2015 | Year: 2015

Method of symmetric polynomials (MSP) is developed to calculations of high powers of matrices. It is based on the new type of recurrence relations between symmetric polynomials of n-th order. New algorithm for computation j-th power of matrix of order n is compared with methods of ordinary multiplication and repeated squaring of matrix. Dependencies of comparative effectiveness R of the new method from power j and order n of matrix are investigated. Computation matrix M2j by MSP is more effective and accurate than the method of repeated squaring of matrix if j > n, and with increasing j comparative effectiveness R tends to n/2. © 2015 IEEE.

Danilov A.,RAS Engelhardt Institute of Molecular Biology | Shaposhnikov M.,Syktyvkar State University | Shevchenko O.,Russian Academy of Sciences | Zemskaya N.,Russian Academy of Sciences | And 2 more authors.
Oncotarget | Year: 2015

Most age-related diseases and aging itself are associated with chronic inflammation. Thus pharmacological inhibition of inflammatory processes may be effective antiaging strategy. In this study we demonstrated that treatment of Drosophila melanogaster with 10 non-steroidal anti-inflammatory drugs (NSAIDs: CAY10404, aspirin, APHS, SC-560, NS-398, SC-58125, valeroyl salicylate, transresveratrol, valdecoxib, licofelone) leads to extension of lifespan, delays age-dependent decline of locomotor activity and increases stress resistance. The effect of the lifespan increase was associated with decrease of fecundity. Depending on the concentration, NSAIDs demonstrated both anti- and pro-oxidant properties in Drosophila tissues. However, we failed to identify clear correlation between antioxidant properties of NSAIDs and their pro-longevity effects. The lifespan extending effects of APHS, SC-58125, valeroyl salicylate, trans-resveratrol, valdecoxib, and licofelone were more pronounced in males, valdecoxib and aspirin - in females. We demonstrated that lifespan extension effect of NSAIDs was abolished in flies with defective genes involved in Pkh2-ypk1-lem3-tat2 pathway.

Belykh D.V.,Russian Academy of Sciences | Pushkareva E.I.,Syktyvkar State University
Russian Journal of General Chemistry | Year: 2011

It is shown that the reaction of methylpheoforbide a with a series of primary and secondary aliphatic amines at elevated temperature (boiling in toluene) leads to the amidation of carbomethoxy group in the position 13(2) of the methylpheoforbide a exocycle instead of the cleavage of exocycle with the formation of the corresponding 13-amides of the chlorin e6. Possible reasons of the observed change in the reaction pathway are presented. © Pleiades Publishing, Ltd., 2011.

Belyayev Y.N.,Syktyvkar State University
Proceedings of the International Conference Days on Diffraction 2014, DD 2014 | Year: 2015

Method of the transfer matrix is used to describe the six-wave diffraction in layered media. The system of differential equations that determine the 6-order transfer matrix is solved by the scaling method with the aid of 6-th order symmetric polynomials. This method is applied to the elastic waves in anisotropic media. Influence of layer thickness and frequency of the wave on the scaling parameter is found. Analytic solutions describing the transfer of thermoe-lastic waves in isotropic media and elastic stresses in the crystalline layers of the cubic, tetragonal and orthorhombic systems are obtained. © 2014 IEEE.

Zhuk N.A.,Syktyvkar State University | Rozhkina N.V.,Syktyvkar State University
Russian Journal of General Chemistry | Year: 2014

Reversible phase transitions of bismuth niobate Bi3NbO 7 have been observed: from the lowtemperature cubic modification to the tetragonal one at 860 C and from the tetragonal modification to the hightemperature cubic one at 950-980 C. With increasing temperature of the cubic modification preparation, the unit cell parameter has been decreasing. Electrophysical properties of the cubic phases have matched at the frequencies below 1 kHz (up to 650 K). The specific conductivity of the tetragonal phase exceeds that of the cubic phase by no more than an order of magnitude (below 1000 K). © 2014 Pleiades Publishing, Ltd.

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