770 results on '"Tyurin, A. A."'
Search Results
2. Centrality and cumulative activities in hadron collisions.
- Author
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Troshin, S. M. and Tyurin, N. E.
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HADRON interactions , *GEOMETRIC modeling , *HADRONS - Abstract
The notion of cumulative activity for elastic events in hadron collision is introduced. The interrelation between centrality and cumulative activities of the elastic and inelastic events has been established for hadron scattering. Considerations on its application are presented. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Scanning Nanoindentation as an Instrument of Studying Local Mechanical Properties Distribution in Wood and a New Technique for Dendrochronology.
- Author
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Golovin, Yu. I., Tyurin, A. I., Gusev, A. A., Matveev, S. M., Golovin, D. Yu., Samodurov, A. A., Vasyukova, I. A., Yunak, M. A., Kolesnikov, E. A., and Zakharova, O. V.
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WOOD , *DENDROCHRONOLOGY , *TREE-rings , *YOUNG'S modulus , *ENGLISH oak , *SCOTS pine , *ALNUS glutinosa - Abstract
The paper presents the results of scanning of mechanical properties of coniferous (common pine Pinus sylvestris) and deciduous (small-leaved lime Tiliacordata and common oak Quercus robur) trees wood using nanoindentation on crosscut face. Manifold increase in microhardness H and Young's modulus E has been observed between early and late wood in every annual growth ring. Significant differences in intraring radial dependencies of H and E have been found among studied species. For all studied species the average values of E and H of early wood in each annual ring are found to be independent from ring width, while such dependence for late wood is weak at most. The ring widths measured by nanoindentation coincide with the ones measured by standard optical method within 2–3%. The developed technique and obtained results can be useful (1) to amend the understanding the origins of macromechanical properties of various wood species and their dependence upon microstructural characteristics and growth conditions, (2) to optimize the technologies of growing, reinforcement and subsequent usage of the wood, (3) to develop new independent high resolution methods in dendrochronology. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
4. Low-Temperature Behavior of the Heat Capacity and Photoluminescence of the Binuclear Pivalate Complex [Eu2(Bаth)2(Piv)6].
- Author
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Fomina, I. G., Tyurin, A. V., Zavorotnyi, Yu. S., and Eremenko, I. L.
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HEAT capacity , *PHOTOLUMINESCENCE , *MONOCLINIC crystal system , *THERMODYNAMIC functions , *HIGH temperatures - Abstract
The low-temperature behavior of the heat capacity and photoluminescence of the earlier structurally characterized binuclear pivalate complex [Eu2(Bath)2(Piv)6] (monoclinic crystal system, I2/a) (I), where Bath = 4,7-diphenyl-1,10-phenanthroline, Piv = , is studied. The temperature dependence of the heat capacity in a temperature range of 5.96–302.88 K is measured by adiabatic calorimetry, and the thermodynamic functions (T), S°(T), Ф°(Т), and Н°(Т) – Н°(0) are calculated. The absence of low-temperature phase transitions in complex I is shown. In a temperature range of 98–295 K, complex I demonstrates a high temperature stability of the integral photoluminescence intensity of the 5D0–7Fj (j = 0–6) transitions of the Eu3+ ion. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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5. Patterns in the Formation of Isomeric Homologous Series of Epicuticular Hydrocarbons in Colorado Beetle Leptinotarsa decemlineata.
- Author
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Ganina, M. D., Tyurin, M. V., Kryukov, V. Yu., and Morozov, S. V.
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COLORADO potato beetle , *HYDROCARBONS , *ACETYLCOENZYME A , *VALINE , *ALKANES - Abstract
Epicuticular hydrocarbons from the Siberian population of Colorado beetle (Leptinotarsa decemlineata) formed eight isomeric homologous series of' mono-, di-, and trimethyl-branched alkanes with C26–C37 main-chain lengths. The major group of isomeric homologous series comprised terminally branched hydrocarbons with branching at the 2-position that were synthesized from valine (51% of the cuticular lipids). A second direction was the synthesis of internally branched alkanes with an acetyl-CoA primer (18%). Isomeric homologous series of hydrocarbons synthesized from propionyl-CoA accounted for 4%. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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6. Synthesis and Thermodynamic Functions of Ruthenium Dichalcogenides in a Wide Temperature Range.
- Author
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Tyurin, A. V., Chareev, D. A., Polotnyanko, N. A., Khoroshilov, A. V., Puzanova, I. G., and Zgurskiy, N. A.
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THERMODYNAMIC functions , *RUTHENIUM , *ISOBARIC heat capacity , *THERMODYNAMICS , *DIFFERENTIAL scanning calorimetry , *GIBBS' free energy - Abstract
Thermodynamic properties of polycrystalline powders of ruthenium dichalcogenides have been studied using calorimetric isobaric heat capacity measurements in a wide temperature range. The adiabatic and differential scanning calorimetry data for ruthenium disulfide and ruthenium diselenide have been used to determine standard thermodynamic functions (heat capacity, entropy, enthalpy increment, and reduced Gibbs energy) of these compounds in the range 10–965 K. At 298.15 K, the functions of RuS2 are as follows: = 60.82 ± 0.12 J/(K mol), S° = 56.05 ± 0.11 J/(K mol), Н°(298.15 K) − Н°(0) = 9.75 ± 0.02 kJ/mol, and Ф° = 23.34 ± 0.05 J/(K mol). For RuSe2, we have obtained = 69.96 ± 0.14 J/(K mol), S° = 80.62 ± 0.16 J/(K mol), Н°(298.15 K) − Н°(0) = 13.05 ± 0.03 kJ/mol, and Ф° = 36.85 ± 0.08 J/(K mol). The data obtained above 298 K have been used to determine empirical coefficients of the Maier–Kelley and Khodakovsky equations. The absolute entropies obtained in this study for the ruthenium dichalcogenides, in combination with literature data, have made it possible to evaluate the Gibbs energy of formation of RuS2(cr) and RuSe2(cr) at 298.15 K. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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7. Cumulative activity of inelastic events under hadron collisions.
- Author
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Troshin, S. M. and Tyurin, N. E.
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HADRON interactions , *GEOMETRIC modeling - Abstract
We introduce the notion of cumulative activity for inelastic events generated under hadron collisions, and discuss its energy dependence and connection with the reflective scattering mode. These issues are relevant for enlightening the asymptotic dynamics in view of the LHC measurements. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
8. Synthesis and Thermodynamic Functions of Ruthenium Ditelluride.
- Author
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Polotnyanko, N. A., Tyurin, A. V., Chareev, D. A., Khoroshilov, A. V., and Popov, E. A.
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THERMODYNAMIC functions , *THERMODYNAMICS , *ISOBARIC heat capacity , *RUTHENIUM , *DIFFERENTIAL scanning calorimetry , *GIBBS' free energy - Abstract
In this paper, we report the synthesis of crystalline ruthenium ditelluride (RuTe2) and its thermodynamic properties in the range from 10 to 965 K, evaluated from its isobaric heat capacity Cp determined using calorimetry. At low temperatures, between 6.86 and 335.11 K, the heat capacity of the synthesized material—pure, free of impurities and foreign phases—was determined by adiabatic calorimetry. In the range 315.3–965.3 K, Cp was determined by differential scanning calorimetry. The data obtained above 298 K have been used to determine empirical coefficients of the Maier–Kelley and Khodakovsky equations. In the range 10–965 K, we have evaluated the standard thermodynamic functions: heat capacity, entropy, enthalpy increment, and reduced Gibbs energy. At 298.15 K, we have obtained = 72.43 ± 0.14 J/(K mol), S° = 94.94 ± 0.19 J/(K mol), Н°(298.15 K) − Н°(0) = 14.60 ± 0.03 kJ/mol, and Ф° = 45.97 ± 0.09 J/(K mol). Using the absolute entropy determined by us and data in the literature and handbooks, we have estimated the standard Gibbs energy of formation of RuTe2: ΔfG°(RuTe2, cr, 298.15) = −130.5 ± 2.9 kJ/mol. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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9. Spectral and kinetic luminescence characteristics of emulsion microcrystals AgBr(I) with adsorbed organic dye.
- Author
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A. V., Tyurin, S. A., Zhukov, A. Y., Bekshaev, and V. B., Ternovsky
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ORGANIC dyes , *LIGHT absorption , *MATERIALS science , *EMULSIONS , *POLYVINYL alcohol , *SOLAR radiation , *LUMINESCENCE , *HOLOGRAPHY , *STATISTICAL physics - Abstract
To reveal the structure of tunnel-luminescence centres in AgBr(I) emulsion microcrystals (EMCs), we perform spectro-sensitometric and kinetic studies of their low-temperature (T = 77 K) luminescence. The luminescence characteristics depending on the binder, the presence and the nature of sensitizing additions (dyes) and the oxygen treatment are studied quantitatively. Special attention is paid to the comparative studies of the Stokes and dye-induced anti-Stokes luminescence components in the AgBr(I) EMCs. When the dye-sensitized AgBr(I) EMCs distributed in the polyvinyl alcohol are excited by the light photons with the energies corresponding to the intrinsic absorption region of the EMCs (λmax ≈ 460 nm), the kinetics of the luminescence band centred at the wavelength λmax ≈ 560 nm is monotonic. On the contrary, upon excitation by the photons corresponding to the absorption region of a J-aggregated dye (λmax ≈ 680 nm), the kinetics of the anti-Stokes glow (λmax ≈ 560 nm) is characterized by a rapid 'flash' followed by a gradual decrease to a stationary level (a 'flash enhancement'). These results indicate that a non-equilibrium transfer of charge carriers from the dye, which is adsorbed on the EMC surface, to the EMC volume depends essentially on the binder. If gelatine is the binder, this process is significantly affected by the oxygen adsorption, whereas the resulting effect depends on the aggregate form of the adsorbed dye. Understanding of physicochemical processes that govern the luminescence centres should enable one to control the structural transformations of the donor-acceptor complexes and clusters, which are responsible for the unique photometric properties of AgBr(I), and optimize their parameters for various applications in optoelectronics, holography, photographic materials science, optical sensors and solar energy systems. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
10. Practical Use of Immortalized Cells in Medicine: Current Advances and Future Perspectives.
- Author
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Voloshin, Nikita, Tyurin-Kuzmin, Pyotr, Karagyaur, Maxim, Akopyan, Zhanna, and Kulebyakin, Konstantin
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PHENOTYPIC plasticity , *CLINICAL trials - Abstract
In modern science, immortalized cells are not only a convenient tool in fundamental research, but they are also increasingly used in practical medicine. This happens due to their advantages compared to the primary cells, such as the possibility to produce larger amounts of cells and to use them for longer periods of time, the convenience of genetic modification, the absence of donor-to-donor variability when comparing the results of different experiments, etc. On the other hand, immortalization comes with drawbacks: possibilities of malignant transformation and/or major phenotype change due to genetic modification itself or upon long-term cultivation appear. At first glance, such issues are huge hurdles in the way of immortalized cells translation into medicine. However, there are certain ways to overcome such barriers that we describe in this review. We determined four major areas of usage of immortalized cells for practical medicinal purposes, and each has its own means to negate the drawbacks associated with immortalization. Moreover, here we describe specific fields of application of immortalized cells in which these problems are of much lesser concern, for example, in some cases where the possibility of malignant growth is not there at all. In general, we can conclude that immortalized cells have their niches in certain areas of practical medicine where they can successfully compete with other therapeutic approaches, and more preclinical and clinical trials with them should be expected. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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11. Meso -Formyl, Vinyl, and Ethynyl Porphyrins—Multipotent Synthons for Obtaining a Diverse Array of Functional Derivatives.
- Author
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Tyurin, Vladimir S., Shkirdova, Alena O., Koifman, Oscar I., and Zamilatskov, Ilya A.
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PORPHYRINS , *CARBON-carbon bonds , *WITTIG reaction , *PYRROLE derivatives , *OPTICAL properties , *HECK reaction - Abstract
This review presents a strategy for obtaining various functional derivatives of tetrapyrrole compounds based on transformations of unsaturated carbon-oxygen and carbon-carbon bonds of the substituents at the meso position (meso-formyl, vinyl, and ethynyl porphyrins). First, synthetic approaches to the preparation of these precursors are described. Then diverse pathways for the transformations of the multipotent synthons are discussed, revealing a variety of products of such reactions. The structures, electronic, and optical properties of the compounds obtained by the methods under consideration are analyzed. In addition, there is an overview of the applications of the products obtained. Biomedical use of the compounds is among the most important. Finally, the advantages of using the reviewed synthetic strategy to obtain dyes with targeted properties are highlighted. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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12. Synthesis and Low-Temperature Thermodynamic Functions of Platinum Ditelluride.
- Author
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Chareev, D. A., Tyurin, A. V., Polotnyanko, N. A., and Chareeva, P. V.
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THERMODYNAMIC functions , *THERMODYNAMICS , *ISOBARIC heat capacity , *GIBBS' free energy , *DEBYE temperatures , *PLATINUM - Abstract
In this paper, we report the synthesis of crystalline platinum ditelluride, PtTe2, a synthetic analog of the mineral moncheite, and its thermodynamic properties. Using the isobaric heat capacity of PtTe2 determined in the range 2–305 K by the relaxation and adiabatic calorimetry methods, we have evaluated its standard thermodynamic functions: entropy, enthalpy increment, and reduced Gibbs energy. The following parameters have been obtained for PtTe2 at 298.15 K: = 75.11 ± 0.15 J/(K mol), S° = 121.5 ± 0.2 J/(K mol), Н°(298.15 K) − Н°(0) = 16.69 ± 0.03 kJ/mol, and Ф° = 65.55 ± 0.13 J/(K mol). Using data in the literature and handbooks, we have estimated the standard Gibbs energy of formation of PtTe2: ΔfG°(PtTe2, cr, 298.15) = –75.4 ± 0.8 kJ/mol. Fractal analysis of the heat capacity data indicates that PtTe2 has a layered structure and that its Debye temperature is 250 K. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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13. CFD modelling of working process of scroll vacuum pump.
- Author
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Tyurin, A. V., Burmistrov, A. V., Raykov, A. A., and Salikeev, S. I.
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VACUUM pumps , *ECCENTRICS (Machinery) , *MATHEMATICAL models , *MODEL validation - Abstract
In recent decade considerable interest has been given to development and study of oil free vacuum pumps. Design of new scroll vacuum pumps is possible only on the basis of reliable mathematical model. In this work verification and validation of mathematical model based on modelling by control volume approach is carried out for a scroll vacuum pump with one-sided one-wrap involute scroll, as an example. The analysis was carried out by comparison of indicator diagrams obtained at different pressures, rotating speeds and driveshaft eccentricities. It is showed that data obtained with the help of mathematical modelling give good agreement with CFD modelling results and with experimental data. The difference is within experimental error. [ABSTRACT FROM AUTHOR]
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- 2023
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14. Luminescent monitoring the state of dichroic complexes in polaroids based on polyvinyl alcohol.
- Author
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Tyurin, A. V., Zhukov, S. A., and Akhmerov, A. Yu.
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DYES & dyeing , *IODINE - Abstract
In this work, to control the content of dichroic complexes in film polarizers based on polyvinyl alcohol, a luminescent technique is proposed that allows us to estimate: the ratio of molecular and paired iodine centers in H-type polarizers at T = 4.2 K; of dichroic complexes caused by molecular and aggregated forms of the dye in L-type polarizers at T = 300 K. The use of this technique will make it possible in the future to establish the dependence of the properties of polarizers on the structure of dichroic complexes, not only in H-type or L-type film polarizers but also in mixed (H + L)-type polarizers, to create polarizers of various spectral ranges. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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15. A hydrogen-bonded CHF⋯HF complex: IR spectra and unusual photochemistry.
- Author
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Sosulin, Ilya S., Tyurin, Daniil A., and Feldman, Vladimir I.
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MATRIX isolation spectroscopy , *AB-initio calculations , *THERMOCHEMISTRY , *PHOTOCHEMISTRY , *BINDING energy , *NOBLE gases - Abstract
A hydrogen-bonded CHF⋯HF complex was characterized by FTIR matrix isolation spectroscopy and ab initio calculations. Three possible structures of this complex were found at the coupled-cluster with single, double, and perturbative triple excitations [CCSD(T)/L3a_3] level of theory. The comparison between the experiment and theory reveals that the most stable structure with the binding energy of 6.48 kcal/mol is formed upon x-ray irradiation of isolated CH2F2 molecules in noble gas matrices (Ne, Ar, Xe). This species appears to be the first known intermolecular complex of monofluorocarbene, and its identification was unambiguously proved by IR absorptions corresponding to HF deformation (libration), CF stretching, H–C–F bending, and CH and HF stretching modes. It is worth noting that the corresponding spectral features in an argon matrix were previously tentatively ascribed to CH2F2+· and HF⋯CHF−· [L. Andrews and F. T. Prochaska, J. Chem. Phys. 70, 4714 (1979)], but the calculations performed in the present study definitely support the re-assignment. The observed CHF⋯HF complex can be converted to the parent CH2F2 under the action of light with λ < 525 nm. The plausible mechanism of this conversion using the conical intersection concept is discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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16. Computerized evaluation of publication effectiveness using application programming interfaces of citation databases.
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Tyurin, Alexander and Shamshurin, Vitaliy
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UNIVERSITIES & colleges , *CITATION indexes , *INFORMATION networks , *DATABASES - Abstract
The article is dedicated to the computerized evaluation of publication effectiveness using accessible API of citation bases. The review of scientific sources indicates that the use of API of such well-known companies and agencies as Elsevier, Clarivate Analytics, Crossref as applicable to international, including domestic, citation indexes plays an important role when creating such systems. The main aim is the analysis of publication activity not only of an organization but also of its divisions. The results of such analysis allow developing effective directions of a higher educational institution policy to motivate for research, creating the necessary reports in the formalized form in the time mode, approximated to the real one, upon the requests. The global analytical citation systems, such as Scopus, Web of Science and Russian Science Citation Index, have such a disadvantage that they often contain the distorted information about the authors' affiliation for the reasons beyond their control. This feature is conditioned by the lack of connection between the databases of publications and the actual place of work of the authors. The solution of such a problem depends on the integration degree of the data obtained for publications into the information network of the higher educational institution. As a particular case, the example of the program module aggregating metadata of articles from three bases, including the use of Elsevier API and allowing the calculation of the actual complex score of the publication effectiveness was developed. The research demonstrated that the actual value of this score significantly differs from the desired one, which is calculated based on the data of the domestic scientific citation index. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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17. Reflective ability and its energy dependence.
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Troshin, S. M. and Tyurin, N. E.
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ENERGY conservation , *ELASTIC scattering - Abstract
We introduce the notion of reflective ability and discuss its energy dependence using rational form of unitarization. Correspondence with the phase of exponential unitarization is traced. Increase of the reflective ability of interaction region starts at the LHC energies. Numerical estimates are given. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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18. Numerical Simulation of the Pressure of a Compression Shell for Sports Purposes.
- Author
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Tyurin, I. N., Getmantseva, V. V., Tashpulatov, S. Sh., Andreeva, E. G., and Belgorodskii, V. S.
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COMPUTER simulation , *HUMAN body , *MATHEMATICAL models , *CLOTHING & dress , *SPORTS - Abstract
The article is devoted to the development of accurate theoretical methods for predicting the pressure of compression shells on the human body. A mathematical model based on numerical methods has been developed. The software script is available for embedding as a 3D-CAD module for designing compression clothing. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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19. Dynamic Balance between PTH1R-Dependent Signal Cascades Determines Its Pro- or Anti-Osteogenic Effects on MSC.
- Author
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Kulebyakin, Konstantin, Tyurin-Kuzmin, Pyotr, Sozaeva, Leila, Voloshin, Nikita, Nikolaev, Mikhail, Chechekhin, Vadim, Vigovskiy, Maxim, Sysoeva, Veronika, Korchagina, Elizaveta, Naida, Daria, and Vorontsova, Maria
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DYNAMIC balance (Mechanics) , *PHOSPHATE metabolism , *INTRACELLULAR calcium , *CALCIUM metabolism , *BONE metabolism , *PERIOSTEUM , *ADIPOSE tissues , *MESENCHYMAL stem cells - Abstract
Parathyroid hormone (PTH) is one of the key regulators of calcium and phosphate metabolism in the body, controlling bone metabolism and ion excretion by the kidneys. At present, attempts to use PTH as a therapeutic agent have been associated with side-effects, the nature of which is not always clear and predictable. In addition, it is known that in vivo impairment of PTH post-receptor signaling is associated with atypical differentiation behavior not only of bone cells, but also of connective tissues, including adipose tissue. In this work, we studied the functional responses of multipotent mesenchymal stromal cells (MSCs) to the action of PTH at the level of single cells. We used MSCs isolated from the periosteum and subcutaneous adipose tissue to compare characteristics of cell responses to PTH. We found that the hormone can activate three key responses via its receptor located on the surface of MSCs: single transients of calcium, calcium oscillations, and hormone-activated smooth increase in intracellular calcium. These types of calcium responses led to principally different cellular responses of MSCs. The cAMP-dependent smooth increase of intracellular calcium was associated with pro-osteogenic action of PTH, whereas phospholipase C dependent calcium oscillations led to a decrease in osteogenic differentiation intensity. Different variants of calcium responses are in dynamic equilibrium. Suppression of one type of response leads to increased activation of another type and, accordingly, to a change in the effect of PTH on cell differentiation. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
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20. Phase-Spectral Ellipsometry Method for Nondestructive Control of the Chemical Composition of thin Metal-Oxide Heterostructures.
- Author
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Tyurin, D. N. and Kotenev, V. A.
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ELLIPSOMETRY , *HETEROSTRUCTURES , *DISTRIBUTION (Probability theory) , *NONDESTRUCTIVE testing , *REFRACTIVE index , *CHEMICAL testing - Abstract
The problem of insufficient accuracy, informativeness and efficiency of recognition of the structure and composition of inhomogeneous surface layers of thin metal-oxide heterostructures during nondestructive testing by spectral optical methods is considered. It is noted that the currently available methods of studying such layers, as a rule, are destructive in nature. To improve the accuracy, informativeness and efficiency of nondestructive testing of the chemical composition of thin metal-oxide heterostructures, a method of phase-spectral ellipsometry has been developed. In this method, the results of ellipsometric measurements of reflected radiation of various wavelengths are used to determine the distribution function of the complex refractive index of an inhomogeneous surface layer along its depth. To implement the proposed method, a phase spectral ellipsometer circuit with a wavelength as a control signal of the feedback channel has been created. The method of phase-spectral ellipsometry is used to control the distribution of chemical composition over the depth of thin metal-oxide heterostructures on the surface of stainless steel Cr18–Ni10–Ti, oxidized at low temperatures and oxygen pressures. When comparing the obtained results with independent Auger profiling data of oxidized samples, it was found that the distribution of the chemical composition over the depth of the oxide corresponds to the independent Auger data. It is shown that the method of phase-spectral ellipsometry makes it possible to clearly separate and identify various oxidized forms of the alloy. The presented method can be used for nondestructive and especially in-situ study of the distribution of chemical composition over the depth of ultrathin inhomogeneous surface oxides. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
21. Energy evolution of the overlap functions: increasing ratio of Ď el(s)/ Ď tot(s) and black ring emergence.
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Troshin, S M and Tyurin, N E
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ELASTIC scattering - Abstract
We consider two possible options of the energy dependency of the elastic and inelastic overlap functions. Those correspond to saturation of the black disk limit (BEL effect) and to the unitarity saturation (REL effect) at s â†' âž. Relation of the REL effect to increase of the ratio Ď el(s)/ Ď tot(s) and emergence of black ring picture at the LHC is underlined. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
22. Dynamics of flexible rotor on journal bearings lubricated with magnetorheological fluid.
- Author
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Fetisov, Alexander and Tyurin, Valentin
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MAGNETORHEOLOGICAL fluids , *JOURNAL bearings , *ROTOR bearings , *ROTOR dynamics , *MAGNETORHEOLOGY , *PERMANENT magnets - Abstract
The paper considers the main integral and dynamic characteristics of a rotor system on hydrodynamic journal bearings lubricated with a magnetorheological fluid. A new design has been proposed in the field of active journal bearings for lubrication by magnetorheological fluids, namely, a journal bearing with full coverage of the gap area by a magnetic field. The basic mathematical relationships, initial and boundary conditions used for calculation of the bearing characteristics are given. Distributions of the friction coefficient, relative eccentricity, stiffness and damping parameters are given. The trajectories of movement of the center of the rotor in various operating modes are presented. Conclusions about the applicability of magnetorheological lubricants for controlling the dynamic characteristics of a rotor on journal bearings lubricated with magnetorheological fluids are presented. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
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23. Pulsed Spallation Neutron Source Based on the Proton Synchrotron U-1.5.
- Author
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Kovalchuk, M. V., Tyurin, N. E., Ivanov, S. V., and Soldatov, A. P.
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NEUTRON sources , *PARTICLE physics , *SYNCHROTRONS , *PROTONS , *ORBITS (Astronomy) - Abstract
The project of a pulsed spallation neutron source driven by a 1.32-GeV proton beam accelerated in the existing rapid cycling proton synchrotron U-1.5 at the National Research Centre "Kurchatov Institute" (NRC KI)–Institute for High Energy Physics (IHEP) is presented. This option would constitute a short-term cost-effective diversification of applied research capabilities of the U-1.5 machine (orbit length 99 m), the facility otherwise employed as a ring injector (booster) into the subsequent larger proton synchrotron U-70 (1.487 km). The source will be used primarily for neutron time-of-flight research techniques. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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24. Using a Polygenic Score to Predict the Risk of Developing Primary Osteoporosis.
- Author
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Yalaev, Bulat, Tyurin, Anton, Prokopenko, Inga, Karunas, Aleksandra, Khusnutdinova, Elza, and Khusainova, Rita
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DISEASE risk factors , *BONE density , *OSTEOPOROSIS , *METABOLIC bone disorders , *TERIPARATIDE - Abstract
Osteoporosis (OP) is a multifactorial bone disease belonging to the metabolic osteopathies group. Using the polygenic score (PGS) approach, we combined the effects of bone mineral density (BMD) DNA loci, affecting osteoporosis pathogenesis, based on GEFOS/GENOMOS consortium GWAS meta-analysis. We developed models to predict the risk of low fractures in women from the Volga-Ural region of Russia with efficacy of 74% (AUC = 0.740; OR (95% CI) = 2.9 (2.353–3.536)), as well as the formation of low BMD with efficacy of 79% (AUC = 0.790; OR (95% CI) = 3.94 (2.993–5.337)). In addition, we propose a model that predicts fracture risk and low BMD in a comorbid condition with 85% accuracy (AUC = 0.850; OR (95% CI) = 6.6 (4.411–10.608)) in postmenopausal women. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
25. Comparative Analysis of Epicuticular Lipids in Locusta migratoria and Calliptamus italicus : A Possible Role in Susceptibility to Entomopathogenic Fungi.
- Author
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Ganina, Mariya D., Tyurin, Maksim V., Zhumatayeva, Ulzhalgas T., Lednev, Georgy R., Morozov, Sergey V., and Kryukov, Vadim Yu.
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MIGRATORY locust , *LIPID analysis , *ENTOMOPATHOGENIC fungi , *BEAUVERIA bassiana , *PHRAGMITES australis , *PHRAGMITES - Abstract
Simple Summary: The surface lipids of insects protect them from desiccation and may modulate susceptibility to fungal infections. We conducted a comparative analysis of cuticular lipids of the migratory locust and Italian locust. The former inhabits relatively wet landscapes and the latter more arid ones. We analyzed cuticular lipids of these species by gas chromatography with mass spectrometry and found that the Italian locust has a hydrocarbon profile shifted toward long chains as well as a higher content of di- and trimethyl branched hydrocarbons, which is most likely an adaptation to the arid climate and strong temperature fluctuations in its habitats. Meanwhile, the surface of the Italian locust proved to be more hospitable for fungi. The number of Metarhizium conidia attached to the Italian locust cuticle was three-fold greater as compared to the migratory locust. Mortality due to the fungal infection was faster in the Italian locust under laboratory conditions. We propose that species inhabiting arid landscapes rarely encounter fungal pathogens and primarily deal with the problem of desiccation. Therefore, they can afford a cuticle that is hospitable to fungal pathogens. Cuticular lipids protect insects from desiccation and may determine resistance to fungal pathogens. Nonetheless, the trade-off between these lipid functions is still poorly understood. The migratory locust Locusta migratoria and the Italian locust Calliptamus italicus have dissimilar hygrothermal preferences: L. migratoria inhabits areas near water bodies with a reed bed, and C. italicus exploits a wide range of habitats and prefers steppes and semideserts with the predominance of sagebrushes. This paper presents significant differences between these species' nymphs in epicuticular lipid composition (according to gas chromatography with mass spectrometry) and in susceptibility to Metarhizium robertsii and Beauveria bassiana. The main differences in lipid composition are shifts to longer chain and branched hydrocarbons (di- and trimethylalkanes) in C. italicus compared to L. migratoria. C. italicus also has a slightly higher n-alkane content. Fatty acids showed low concentrations in the extracts, and L. migratoria has a wider range of fatty acids than C. italicus does. Susceptibility to M. robertsii and the number of conidia adhering to the cuticle proved to be significantly higher in C. italicus, although conidia germination percentages on epicuticular extracts did not differ between the species. We propose that the hydrocarbon composition of C. italicus may be an adaptation to a wide range of habitats including arid ones but may make the C. italicus cuticle more hospitable for fungi. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
26. Development of dual reporter vector system for estimating translational activity of regulatory elements.
- Author
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Suhorukova, Aleksandra V., Tyurin, Alexander A., Pavlenko, Olga S., Mustafayev, Orkhan N., Sinelnikov, Igor G., and Goldenkova-Pavlova, Irina V.
- Subjects
- *
CLOSTRIDIUM thermocellum , *MESSENGER RNA , *REPORTER genes , *GENETIC vectors , *GENETIC code , *HIGH throughput screening (Drug development) - Abstract
Background: For the needs of modern biotechnology, a quantitative approach to the control of regulatory elements at all stages of gene expression has long become indispensable. Such a control regime is impossible without a quantitative analysis of the role of each regulatory element or pattern used. Therefore, it seems important to modify and develop the accuracy, reproducibility, and availability of methods for quantifying the contribution of each regulatory code to the implementation of genetic information. Results: A new vector system for transient expression in plants is described; this system is intended for quantitative analysis of the contribution of regulatory elements to transcription and translation efficiencies. The proposed vector comprises two expression cassettes carrying reporter genes (of the Clostridium thermocellum thermostable lichenase and E. coliβ-glucuronidase) under the control of different promoters. Herewith we also propose a new method for quantification of the effect of tested regulatory elements on expression, which relies on assessment of the enzyme activities of reporter proteins taking into account the transcription of their genes. Conclusions: In our view, this approach makes it possible to precisely determine the amounts of reporter proteins and their transcripts at all stages of expression. The efficiency of the proposed system has been validated by the analysis of the roles of known translation enhancers at the stages of transcription and translation. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
27. Rational Form of Amplitude and Its Asymptotic Factorization.
- Author
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Troshin, Sergey Mikhailovich and Tyurin, Nikolai Evgenjevich
- Subjects
- *
ELASTIC scattering - Abstract
We provide arguments for the use of the rational form of unitarization, its relation with the diffraction peak shrinkage and asymptotics of the inelastic cross-section. The particular problems of the Regge model and the exponential form of unitarization with a factorized eikonal are discussed as well. A central role belongs to the asymptotic amplitude factorization resulting from Mandelstam analyticity and its symmetry over the scattering variables. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
28. Spectroscopic characterization of the complex of vinyl radical and carbon dioxide: Matrix isolation and ab initio study.
- Author
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Ryazantsev, Sergey V., Tyurin, Daniil A., Feldman, Vladimir I., and Khriachtchev, Leonid
- Subjects
- *
CARBON dioxide , *MATRICES (Mathematics) , *PHOTOLYSIS (Chemistry) , *MONOMERS , *INFRARED spectroscopy - Abstract
We report on the preparation and vibrational characterization of the C2H3...CO2 complex, the first example of a stable intermolecular complex involving vinyl radicals. This complex was prepared in Ar and Kr matrices using UV photolysis of propiolic acid (HC3OOH) and subsequent thermal mobilization of H atoms. This preparation procedure provides vinyl radicals formed exclusively as a complex with CO2, without the presence of either CO2 or C2H3 monomers. The absorption bands corresponding to the v5(C2H3), v7(C2H3), v8(C2H3), v2(CO2), and v3(CO2) modes of the C2H3...CO2 complex were detected experimentally. The calculations at the UCCSD(T)/L2a level of theory predict two structures of the C2H3...CO2 complex with Cs and C1 symmetries and interaction energies of -1.92 and -5.19 kJ mol-1. The harmonic vibrational frequencies of these structures were calculated at the same level of theory. The structural assignment of the experimental species is not straightforward because of rather small complexation-induced shifts and matrix-site splitting of the bands (for both complex and monomers). We conclude that the C1 structure is the most probable candidate for the experimental C2H3...CO2 complex based on the significant splitting of the bending vibration of CO2 and on the energetic and structural considerations. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
29. Raising the Properties of Steel 30KhGSA by Creating a Mixed Martensitic-Austenitic Structure.
- Author
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Popelyukh, A. I., Tyurin, A. G., and Bardin, A. I.
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TEMPERING , *FATIGUE limit , *STEEL , *FRACTOGRAPHY , *FATIGUE cracks , *MARTENSITIC structure , *FATIGUE crack growth - Abstract
The structure and properties of steel 30KhGSA are studied after hardening by the quenching and partitioning (Q&P) process and, for comparison, by the standard modes of quenching and tempering. Metallographic and fractographic analyses and impact bending tests of the steel are performed. Kinetic diagrams of fatigue fracture are plotted, and the stress intensity factor ∆K and the rate of growth of fatigue crack v are computed. It is shown that the Q&P treatment yields a heterogeneous martensitic structure with interlayers of ductile retained austenite, which raises the impact toughness of the steel by a factor of 1.5 – 2 and the resistance to fatigue crack propagation by a factor of 1.5 as compared to the same characteristics after the traditional quenching and tempering. The strength of the steel remains virtually unchanged. The Q&P treatment may be recommended for raising the structural strength of heavily loaded machine parts. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
30. Matrix isolation and ab initio study on HCN/CO2 system and its radiation-induced transformations: Spectroscopic evidence for HCN ... CO2 and trans-HCNH ... CO2 complexes.
- Author
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Kameneva, Svetlana V., Tyurin, Daniil A., Nuzhdin, Kirill B., and Feldmana, Vladimir I.
- Subjects
- *
MATRIX isolation , *PHASE transitions , *COMPLEX compounds , *FOURIER transform infrared spectroscopy , *ARGON , *CARBON monoxide - Abstract
Spectroscopic characteristics and X-ray induced transformations of the HCN... CO2 complex in solid Ar and Kr matrices were studied by FTIR spectroscopy and ab initio calculations at the CCSD(T) level. The complexwas prepared by deposition of the HCN/CO2/Ng gas mixtures (Ng = Ar or Kr). The comparison of the experiment and calculations prove formation of a linear, H-bonded NCH... OCO complex with a substantial red shift of the C-H stretching band and a blue shift of the H-C-N bending band in respect to the monomer. This result is in contrast with the previous gas-phase observations, where only T-shape complex was found. Irradiation of deposited matrices leads to formation of CN radicals and HNC molecules and subsequent annealing results in appearance of H2CN and trans-HCNH in both matrices plus HKrCN in the case of Kr. In the presence of CO2, the strongest absorption of trans-HCNH radical demonstrates an additional blue-shifted (by 6.4 cm-1) feature, which was assigned to the N-coordinated complex of this radical with CO2 on the basis of comparison with calculations. To our knowledge, it is the first experimentally observed complex of this radical. No evidence was found for HKrCN... CO2 complex, which was explained tentatively by steric hindrance. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
31. Radiation-induced transformations of isolated dimethyl disulphide molecules in solid argon.
- Author
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Shchus, Ivan V., Tyurin, Daniil A., and Feldman, Vladimir I.
- Subjects
- *
ETHANES , *ARGON , *FOURIER transform infrared spectroscopy , *MOLECULES , *RADIOLYSIS - Abstract
The radiation-induced transformations of isolated dimethyl disulphide molecules in a solid argon matrix occurring under the action of X-rays at 4.5 K were studied by FTIR spectroscopy. It was shown that decomposition was quite efficient (the corresponding radiation-chemical yield of Me 2 S 2 degradation was estimated as 4.5 molecules per 100 eV). The radiolysis proceeds via two primary channels yielding CH 3 SH plus H 2 CS and CH 4 plus H 2 CSS, respectively. These two channels of dimethyl disulphide decay during radiolysis lead to various secondary products appearing during prolonged radiolysis. Spectroscopic characteristics of the observed products and possible implications of the results are discussed. • Efficient radiolysis of isolated dimethyl disulphide molecules in solid argon was showed. • Two primary channels of radiolysis of dimethyl disulphide molecules were discovered. • With prolonged radiolysis of dimethyl disuphide molecules, a variety set of products is discovered. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
32. Determination of the Thermal Diffusivity of Transparent Materials by a New Thermographic Express Method.
- Author
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Golovin, Yu. I., Tyurin, A. I., Golovin, D. Yu., and Samodurov, A. A.
- Subjects
- *
THERMAL diffusivity , *LIGHT absorption , *NONMETALLIC materials , *THERMAL conductivity , *FUSED silica , *INFRARED radiation - Abstract
The thermophysical characteristics of nonmetallic materials (in particular, thermal conductivity and thermal diff usivity) account for their heat-insulating properties, the quality of processing in various laser technologies, and also signifi cantly aff ect the optical strength of power optics materials. Determination of thermophysical characteristics by traditional methods requires laborious manufacturing of specimens of certain sizes and two-sided access to them, which prevents the use of nondestructive testing of large workpieces and fi nished products. The article describes a nondestructive thermographic method of measuring the thermal diff usivity of transparent and semitransparent materials, which does not require cutting out samples from the test object and two-sided access to it. To increase the coeffi cients of absorption and emission of visible and infrared radiation of the accessible surface, thin opaque coatings or targets with a diameter of several tenths of a millimeter were used. The method was tested on eight optically transparent polymeric, amorphous, and crystalline materials diff ering in composition, spectral characteristics of light absorption, surface condition and overlapping about 2 orders of magnitude in thermal diff usivity. The described procedure demonstrated a small random error (0.5% for polymethyl methacrylate, 1.1% for polycarbonate, 2.3% for fused quartz, 3.3% for monocryslalline NaCl) at a speed of about 10 s, which makes it possible to use it for rapid diagnostics of newly created heat-shielding materials and elements of power optics. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
33. Inexact model: a framework for optimization and variational inequalities.
- Author
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Stonyakin, Fedor, Tyurin, Alexander, Gasnikov, Alexander, Dvurechensky, Pavel, Agafonov, Artem, Dvinskikh, Darina, Alkousa, Mohammad, Pasechnyuk, Dmitry, Artamonov, Sergei, and Piskunova, Victorya
- Subjects
- *
OPERATOR functions , *COMPOSITE structures - Abstract
In this paper, we propose a general algorithmic framework for the first-order methods in optimization in a broad sense, including minimization problems, saddle-point problems and variational inequalities (VIs). This framework allows obtaining many known methods as a special case, the list including accelerated gradient method, composite optimization methods, level-set methods, Bregman proximal methods. The idea of the framework is based on constructing an inexact model of the main problem component, i.e. objective function in optimization or operator in VIs. Besides reproducing known results, our framework allows constructing new methods, which we illustrate by constructing a universal conditional gradient method and a universal method for VIs with a composite structure. This method works for smooth and non-smooth problems with optimal complexity without a priori knowledge of the problem's smoothness. As a particular case of our general framework, we introduce relative smoothness for operators and propose an algorithm for VIs with such operators. We also generalize our framework for relatively strongly convex objectives and strongly monotone VIs. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
34. A high throughput assay of lichenase activity with Congo red dye in plants.
- Author
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Tyurin, Alexander A., Suhorukova, Aleksandra V., Deineko, Igor V., Pavlenko, Olga S., Fridman, Viktoriia A., and Goldenkova-Pavlova, Irina V.
- Subjects
- *
CONGO red (Staining dye) , *CLOSTRIDIUM thermocellum , *PROTEIN expression , *PLANT proteins , *PROTEIN analysis , *PHOTOVOLTAIC power systems - Abstract
Background: Since the beginning of the use of reporter proteins for expression analysis, a variety of approaches have been developed and proposed; both qualitative and quantitative. The lack of simple methods for direct observation of gene expression in living organisms makes it necessary to continue to propose new methods. In this work, we consider a method for the quantitative analysis of the expression of thermostable lichenase from Clostridium thermocellum used as a sensitive reporter protein. Results: In this study, we report the design a high throughput fluorometric method for quantification of thermostable lichenase C. thermocellum using Congo red and further experimental verification of its relevance and efficiency in assessment of the functional role of regulatory sequences in the plant cell. Conclusions: The specific interaction between the dye Congo red and β -d-glucans formed the background for designing a high-throughput fluorometric assay for quantification of C. thermocellum thermostable lichenase as a reporter protein for plants. This assay (i) makes it possible to precisely measure the amount of reporter protein in a plant sample; (ii) has shown a high sensitivity for quantification of thermostable lichenase; (iii) is more time- and cost-efficient as compared with the Somogyi–Nelson assay; and (iv) is to the least degree dependent on the presence of the tested buffer components as compared with the Somogyi–Nelson assay. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
35. Gausemycins A,B: Cyclic Lipoglycopeptides from Streptomyces sp.
- Author
-
Tyurin, Anton P., Alferova, Vera A., Paramonov, Alexander S., Shuvalov, Maxim V., Kudryakova, Gulnara K., Rogozhin, Eugene A., Zherebker, Alexander Y., Brylev, Vladimir A., Chistov, Alexey A., Baranova, Anna A., Biryukov, Mikhail V., Ivanov, Igor A., Prokhorenko, Igor A., Grammatikova, Natalia E., Kravchenko, Tatyana V., Isakova, Elena B., Mirchink, Elena P., Gladkikh, Elena G., Svirshchevskaya, Elena V., and Mardanov, Andrey V.
- Subjects
- *
CYCLIC compounds , *STREPTOMYCES , *CYCLIC peptides , *GRAM-positive bacteria , *ORNITHINE , *TYROSINE , *ACYLATION - Abstract
We report a novel family of natural lipoglycopeptides produced by Streptomyces sp. INA‐Ac‐5812. Two major components of the mixture, named gausemycins A and B, were isolated, and their structures were elucidated. The compounds are cyclic peptides with a unique peptide core and several remarkable structural features, including unusual positions of d‐amino acids, lack of the Ca2+‐binding Asp‐X‐Asp‐Gly (DXDG) motif, tyrosine glycosylation with arabinose, presence of 2‐amino‐4‐hydroxy‐4‐phenylbutyric acid (Ahpb) and chlorinated kynurenine (ClKyn), and N‐acylation of the ornithine side chain. Gausemycins have pronounced activity against Gram‐positive bacteria. Mechanistic studies highlight significant differences compared to known glyco‐ and lipopeptides. Gausemycins exhibit only slight Ca2+‐dependence of activity and induce no pore formation at low concentrations. Moreover, there is no detectable accumulation of cell wall biosynthesis precursors under treatment with gausemycins. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
36. Gausemycins A,B: Cyclic Lipoglycopeptides from Streptomyces sp.
- Author
-
Tyurin, Anton P., Alferova, Vera A., Paramonov, Alexander S., Shuvalov, Maxim V., Kudryakova, Gulnara K., Rogozhin, Eugene A., Zherebker, Alexander Y., Brylev, Vladimir A., Chistov, Alexey A., Baranova, Anna A., Biryukov, Mikhail V., Ivanov, Igor A., Prokhorenko, Igor A., Grammatikova, Natalia E., Kravchenko, Tatyana V., Isakova, Elena B., Mirchink, Elena P., Gladkikh, Elena G., Svirshchevskaya, Elena V., and Mardanov, Andrey V.
- Subjects
- *
CYCLIC compounds , *STREPTOMYCES , *CYCLIC peptides , *GRAM-positive bacteria , *ORNITHINE , *TYROSINE , *ACYLATION - Abstract
We report a novel family of natural lipoglycopeptides produced by Streptomyces sp. INA‐Ac‐5812. Two major components of the mixture, named gausemycins A and B, were isolated, and their structures were elucidated. The compounds are cyclic peptides with a unique peptide core and several remarkable structural features, including unusual positions of d‐amino acids, lack of the Ca2+‐binding Asp‐X‐Asp‐Gly (DXDG) motif, tyrosine glycosylation with arabinose, presence of 2‐amino‐4‐hydroxy‐4‐phenylbutyric acid (Ahpb) and chlorinated kynurenine (ClKyn), and N‐acylation of the ornithine side chain. Gausemycins have pronounced activity against Gram‐positive bacteria. Mechanistic studies highlight significant differences compared to known glyco‐ and lipopeptides. Gausemycins exhibit only slight Ca2+‐dependence of activity and induce no pore formation at low concentrations. Moreover, there is no detectable accumulation of cell wall biosynthesis precursors under treatment with gausemycins. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
37. Study and modeling of hydrogen release from Ti, Zr, Ni, Pd, Pt during linear heating.
- Author
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Tyurin, Yu.I., Nikitenkov, N.N., Sypchenko, V.S., Hongru, Zhang, and Syaole, Ma
- Subjects
- *
DESORPTION kinetics , *HYDROGEN , *HYDROGEN analysis , *PRECIOUS metals , *THERMAL desorption - Abstract
New the experimental results of thermally stimulated hydrogen release (TCHR) from plane-parallel plates of Ti, Zr, Ni, Pd, Pt metals with various thicknesses (0.05–1 mm), pre-saturated with hydrogen, under linear heating (1 °C s−1) presented. The electrolytic and Sieverts method for saturate were used. Theoretical models for diffusion and desorption hydrogen release from flat metal samples into vacuum with linear heating were developed. In this case, the processes of diffusion and thermal desorption were taken into account to select the optimal conditions and experimental methods. The TSHR spectra simulated using the MATLAB software package to test the consistency of theory with experiment. By modeling in MATLAB using both the developed models and experimental TSHR spectra, the activation energies of desorption, diffusion and decomposition of hydrides, as well as the preexponential factors in the diffusion and kinetic equations, were determined. • Studied thermal stimulated hydrogen release (TSHR) from different metals allows. • Studied and performed mathematical analysis of hydrogen desorption kinetics. • Developed physical and mathematical models of TSHR. • Simulated hydrogen diffusion, desorption, hydride decay processes with MATLAB. • Determined activation diffusion, desorption and decomposition energy and others. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
38. Examples of Mironov Cycles in Grassmannians.
- Author
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Tyurin, N. A.
- Subjects
- *
GRASSMANN manifolds , *GENERALIZATION , *TORIC varieties - Abstract
Providing some examples of Lagrangian cycles that arise as a generalization of Mironov's construction to the case of Grassmann manifolds , we show that these manifolds enjoy all data necessary for this generalization, the natural real structure, and an incomplete toric action. We also provide new concrete examples. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
39. Simple approach towards phosphorus-substituted spiro 1,3,4-thiadiazolines.
- Author
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Kozlov, Mikhail, Tyurin, Alexey, Dmitrenok, Andrey, Rusak, Vyacheslav, Fedorov, Aleksander, Zavarzin, Igor, and Volkova, Yulia
- Subjects
- *
ACYL chlorides , *KETONES , *HYDRAZIDES , *KETONIC acids , *FUNCTIONAL groups , *ACYLATION - Abstract
This study reports the first general, practical, and facile synthesis of phosphorus-substituted 1,3,4-thiadiazolines starting from phosphorylthioformic acid hydrazides and ketones. Various cyclic ketones were efficiently incorporated into spiro 1,3,4-thiadiazoline derivatives by a two-step sequence involving the heterocyclization with phosphorylthioformic acid hydrazides followed by the nitrogen acylation with acyl chlorides. The protocol is characterized by operational simplicity, readily available reagents, and functional group tolerance. [Display omitted] [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
40. Experimental study of oil free scroll vacuum pump parameters.
- Author
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Tyurin, A., Raykov, A., Salikeev, S., Burmistrov, A., Kapustin, E., Myshlyavtsev, Alexander V, Likholobov, Vladimir A, and Yusha, Vladimir L
- Subjects
- *
VACUUM pumps , *DRIVE shafts , *PETROLEUM - Abstract
Mathematical model of working process of scroll vacuum pumps was developed earlier to improve scroll vacuum pumps. For its verification experimental database for the object under study was required. For this purpose experimental unit to test oil free scroll vacuum pump is developed. Relationships such as pressure in pump working chambers vs rotation angle of the drive shaft, pump ultimate pressure vs drive shaft rotation speed, pumping speed vs pump inlet pressure, power consumption vs pump inlet pressure, temperature of the housing, orbiting and fixed scroll elements, gas at the inlet and outlet of the pump vs pump inlet pressure are obtained. Behavior of these parameters depending on pump working regimes is discussed. Experimental data will be used for verification of mathematical model of scroll vacuum pump. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
41. Particularities of Ensuring the Precision of Filaments from 12H18N9T Steel for Additive Manufacturing at their Fabrication.
- Author
-
Yanpolskiy, V., Tyurin, A., and Ruktuev, A.
- Subjects
- *
FABRICATION (Manufacturing) , *STEEL manufacture , *FIBERS , *WIREDRAWING , *ELECTRON beams - Abstract
The issues of ensuring the accuracy of the filaments’ production for additive manufacturing using the electron beam energy at the stage of drawing of a workpiece made of 12H18N9T steel were considered. The reduction ratio varied in the range from ε = 5 % to ε = 67.5 %. Calculations showed that the dimensions of a workpiece for producing filaments with a diameter of Ø 1.3-0.09 mm was limited by Ø 4.27-0.17 mm. It was experimentally established that the diameter of a filament made of 12H18N9T steel after the last reducing step (1.3 mm) exceeded the allowable diameter (1.3−0,09 mm) and equaled to 1.37 mm. This deviation is probably induced by elasto-plastic strains occurring in the wire in the drawing process. To provide the required accuracy of the filaments with a diameter of Ø 1.3-0.09 obtained by drawing of 12H18N9T steel, it was recommended to grin the diameter of a die taking into account the magnitude of the elastic deformations, i.e. provide the diameter 0.05 mm smaller than required. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
42. Optimizing Technological Parameters of Drawing for Ti-6Al-4V Filament Manufacturing.
- Author
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Popelyukh, A. I., Tyurin, A. G., Ruktuev, A. A., Smirnov, A. I., and Rashkovets, M. V.
- Subjects
- *
METAL fibers , *FIBERS , *SLIDING friction , *TITANIUM alloys , *MANUFACTURED products - Abstract
The technological parameters of drawing for creating Ti-6Al-4V titanium alloy filaments were optimized. Selection of a lubricant for the manufacture of metal filaments of Ti-6Al-4V alloy (wire, rod) was carried out based on the evaluation of the tribotechnical properties. It was found that the most preferred type of lubricant is beeswax according to GOST 21179-2000. With sliding friction according to the “disc-pad” scheme, the friction coefficient with the speed of 150 rpm and the load of 300 N is 0.06. Since the drawing stress and force parameters do not depend on the drawing speed the drawing to obtain laboratory experimental samples of cylindrical filaments of Ti-6Al-4V alloy can be carried out at various speeds in the range from 30 to 360 mm/min. The drawing route of cylindrical filaments of Ti-6Al-4V alloy with dimensions from Ø4 mm to Ø1.2 mm was compiled based on the analysis of the dependences of drawing force, drawing stress and safety factor, as well as the mechanical properties of the manufactured products. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
43. Algorithms for Synthesis of Energy-Efficient Control by Mimo Systems Functioning on Long Time Intervals.
- Author
-
Muromtsev, D. Yu., Tyurin, I. V., Gribkov, A. N., Belousov, O. A., Shamkin, V. N., and Belyaev, M. P.
- Subjects
- *
MIMO systems , *PETROLEUM reserves , *FOSSIL fuels , *INTELLIGENT control systems , *PROCESS control systems , *POWER resources , *ELECTRIC heating systems - Abstract
Due to the limited reserves of natural hydrocarbons, more and more attention has been paid to the problem of saving energy resources. Reducing energy consumption improves the environmental situation by decreasing harmful emissions to the atmosphere. In our country, despite the presence of significant reserves of oil, gas and coal, the costs of their production and transportation are constantly growing. Nevertheless, insufficient attention is paid to solving the problems of energy-saving control of MIMO energy-consuming industrial and domestic facilities, although theoretical studies have shown that optimal control can reduce energy costs or fuel consumption by 15–20% or more compared to traditional systems. Such facilities include multi-zone electric furnaces, multi-section drying installations, boiler installations, multi-drive machines and other installations operating on hydrocarbon fuels or electricity. Such facilities are used in housing and communal services, industrial enterprises and in everyday life. The development of a methodology for building intelligent systems of energy-saving control of MIMO process systems on a set of operating states is a fundamental problem for the industry. The solution of this problem is connected with the development of methods for solving a whole complex of diverse and complex problems, including those associated with the creation of models, methods and algorithms that minimize the cost of energy resources in the operation of MIMO systems taking into account possible changes in the state of functioning in actual operation. The paper considers the synthesis of algorithms for energy-efficient control actions for intelligent control of MIMO technological systems. The problems of synthesis and algorithmic support for their solution are explored using the example of a five-section electric convection heater RO400FC-C. The proposed algorithms are used for different operation conditions-heating, temperature maintenance, and an emergency mode associated with failures of individual heating elements during operation of the heater. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
44. Calculation of Backward Flow in Channels with Moving Walls in Oil Free Non-Contact Vacuum Pumps.
- Author
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Raykov, A. A., Tyurin, A. V., Burmistrov, A. V., Salikeev, S. I., Bronstein, M. D., and Fomina, M. G.
- Subjects
- *
CHANNEL flow , *VACUUM pumps , *VISCOUS flow , *GAS flow , *GAS compressors , *PETROLEUM , *NON-Newtonian fluids , *SODIUM channels - Abstract
Procedure of conductance calculation of radial channels formed by moving walls in non-contact pumps and compressors in viscous gas flow regime is developed. Comparison of calculated data and data obtained by numerical solution of gas flow is carried out for inlet pressures from 100 to 105 Pa and wall velocities 5–40 m/s. Formula for approximate conductance calculation of channels with moving walls used as the initial approximation in the presented procedure is obtained for faster calculation. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
45. Performance Analysis of Shell-and-Tube Heat Exchanger.
- Author
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Tyurin, M. P., Borodina, E. S., Aparushkina, M. A., Deryugin, N. V., and Dombrovskaya, A. I.
- Subjects
- *
HEAT exchangers , *HEAT transfer , *REYNOLDS number , *TUBES - Abstract
The efficiency of heat transfer in heat exchangers having a staggered and in-line arrangement of a tube bundle is compared. The dependence of pressure losses on the minimum relative tube pitch for the considered arrangements of tubes at various Reynolds numbers is shown. Using heat exchangers with staggered tube arrangements at production facilities for chemical fibers is substantiated. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
46. The Relationship between the Mechanical Properties of Anisotropic Materials and Their Thermophysical Characteristics Using the Example of Pine Wood.
- Author
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Golovin, Yu. I., Tyurin, A. I., Golovin, D. Yu., Samodurov, A. A., and Vasyukova, I. A.
- Subjects
- *
MECHANICAL behavior of materials , *MOISTURE in wood , *SCOTS pine , *THERMAL diffusivity , *WOOD preservatives , *PINE , *THERMOGRAPHY - Abstract
The relationship between the mechanical properties of anisotropic materials and their thermophysical characteristics was experimentally revealed using the example of Scots pine (Pınus sylvéstris L) wood. By measuring the hardness and principal components of the thermal diffusivity tensor, on three sections (normal to the fibers, tangential, and radial) at different wood moisture content, it has been shown that this relationship can be described by linear functions. This makes it possible to carry out an express assessment of the mechanical properties of anisotropic materials, which normally require labor- and material-intensive destructive tests, by means of contactless nondestructive determination of their thermophysical characteristics using the method of dynamic thermography. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
47. Thermodynamic Properties of AuSb2.
- Author
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Tyurin, A. V., Chareev, D. A., and Polotnyanko, N. A.
- Subjects
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HEAT capacity , *THERMODYNAMIC functions , *CALORIMETRY - Abstract
We have for the first time determined the temperature dependence of heat capacity for aurostibite, AuSb2, by adiabatic calorimetry and calculated its standard thermodynamic functions in a wide temperature range. At a temperature of 298.15 K, we have obtained = 76.01 ± 0.15 J/(mol K), S° = 133.4 ± 0.3 J/(mol K), Н°(298.15 K) − Н°(0)= 17.39 ± 0.03 kJ/mol, and Ф° = 75.02 ± 0.15 J/(mol K). Using previously reported data and the present results, we have found ΔfG°(298.15) = −11.36 ± 0.90 kJ/mol. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
48. PLA2G6 guards placental trophoblasts against ferroptotic injury.
- Author
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Beharier, Ofer, Tyurin, Vladimir A., Goff, Julie P., Guerrero-Santoro, Jennifer, Kazuhiro Kajiwara, Tianjiao Chu, Tyurina, Yulia Y., St Croix, Claudette M., Wallace, Callen T., Parry, Samuel, Parks, W. Tony, Kagan, Valerian E., and Sadovsky, Yoel
- Subjects
- *
GLUTATHIONE peroxidase , *PREMATURE labor , *WOUNDS & injuries , *CELL death , *OXIDATIVE stress - Abstract
The recently identified ferroptotic cell death is characterized by excessive accumulation of hydroperoxy-arachidonoyl (C20:4)- or adrenoyl (C22:4)- phosphatidylethanolamine (Hp-PE). The seleniumdependent glutathione peroxidase 4 (GPX4) inhibits ferroptosis, converting unstable ferroptotic lipid hydroperoxides to nontoxic lipid alcohols in a tissue-specificmanner. While placental oxidative stress and lipotoxicity are hallmarks of placental dysfunction, the possible role of ferroptosis in placental dysfunction is largely unknown. We found that spontaneous preterm birth is associated with ferroptosis and that inhibition of GPX4 causes ferroptotic injury in primary human trophoblasts and during mouse pregnancy. Importantly, we uncovered a role for the phospholipase PLA2G6 (PNPLA9, iPLA2beta), known to metabolize Hp-PE to lyso-PE and oxidized fatty acid, in mitigating ferroptosis induced by GPX4 inhibition in vitro or by hypoxia/ reoxygenation injury in vivo. Together, we identified ferroptosis signaling in the human and mouse placenta, established a role for PLA2G6 in attenuating trophoblastic ferroptosis, and provided mechanistic insights into the ill-defined placental lipotoxicity that may inspire PLA2G6-targeted therapeutic strategies. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
49. Accelerated and Unaccelerated Stochastic Gradient Descent in Model Generality.
- Author
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Dvinskikh, D. M., Tyurin, A. I., Gasnikov, A. V., and Omel'chenko, C. C.
- Subjects
- *
STOCHASTIC convergence , *TECHNOLOGY convergence , *PROBLEM solving - Abstract
A new method for deriving estimates of the rate of convergence of optimal methods for solving problems of smooth (strongly) convex stochastic optimization is described. The method is based on the results of stochastic optimization derived from results on the convergence of optimal methods under the conditions of inexact gradients with small noises of nonrandom nature. In contrast to earlier results, all estimates in the present paper are obtained in model generality. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
50. Increasing effective intensity of soft strong interactions.
- Author
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Troshin, S. M. and Tyurin, N. E.
- Subjects
- *
HADRON interactions , *DEFINITIONS - Abstract
We suggest definition of effective interaction intensity for soft hadron collisions and discuss its energy dependence in the preasymptotic region. Practical importance of this quantity consists in separation of rising interaction radius from effective interaction intensity increase both contributing to the total cross-section growth. It would be helpful for understanding the origin of this growth at the accelerator energies. The essential feature is that the effective interaction intensity is an experimentally measurable quantity. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
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