377 results on '"V. Babkin"'
Search Results
302. [Substrate specificity of restriction endonuclease Kpn378I]
- Author
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Iu P, Zernov, L R, Lebedev, I V, Babkin, and V E, Chizhikov
- Subjects
Klebsiella pneumoniae ,Base Sequence ,Molecular Sequence Data ,DNA ,Deoxyribonucleases, Type II Site-Specific ,Substrate Specificity - Published
- 1990
303. Nucleation of helium-4 crystals at Millikelvin temperatures
- Author
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Jari Penttilä, Edouard Sonin, J. P. Ruutu, A. V. Babkin, and Pertti Hakonen
- Subjects
Helium-4 ,Pressure measurement ,Materials science ,Condensed matter physics ,law ,Capacitive sensing ,Nucleation ,Temperature independent ,General Physics and Astronomy ,Thermal fluctuations ,law.invention - Abstract
We have measured overpressures needed to nucleate helium-4 crystals at temperatures 2 mK-1.0 K. Distributions of nucleation pressures were recorded using a sensitive capacitive pressure gauge with a resolution of 0.3 μbar. Above 100 mK the median value of the distribution decreased according toT −1/2 as expected for thermal fluctuations. Below 100 mK we observed a crossover to a temperature independent regime.
- Published
- 1996
304. Observation of a new surface state on4He crystal interfaces
- Author
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Pertti Hakonen, Harry Alles, A. V. Babkin, Alexander Parshin, Jari Saramäki, and Juusi Ruutu
- Subjects
Crystal ,Surface (mathematics) ,Physics ,Discontinuity (linguistics) ,Current (mathematics) ,General Physics and Astronomy ,Boundary (topology) ,Surface phonon ,State (functional analysis) ,Atomic physics ,Surface reconstruction - Abstract
The equilibrium shape ofhcp 4He crystals has been studied at temperatures 0.05≤T≤0.7 K by means of a high precision optical interferometer. We find that the profile of the interfacial boundary, close to an almost horizontal c-facet, has a well-defined slope discontinuity separating two angular regions with different behavior of the surface stiffness $$\tilde \alpha $$ . For surfaces tilted by an angle ϕ≤100 μrad with respect to the c-facet, we obtain $$\tilde \alpha = \kappa /\phi $$ , contrary to the linear angular dependence predicted by current theories.
- Published
- 1996
305. Anomalous growth of c-facets in4He crystals at mK-temperatures
- Author
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J. P. Ruutu, Pertti Hakonen, A. V. Babkin, Jari Saramäki, and Jari Penttilä
- Subjects
Materials science ,Optics ,business.industry ,Analytical chemistry ,General Physics and Astronomy ,Facet ,business - Abstract
We have studied growth of c-facets in4He crystals without screw dislocations at temperatures 2–200 mK. High-resolution optical interferometry allowed us to resolve interfacial speeds down to 0.01 nm/s. Contrary to expectations, c-facets were found to grow about 1 atomic layer/sec at relatively small overpressures of 0.1 mbar; this rate decreased by a factor of ten when temperature was increased from 20 mK up to 200 mK. At larger speeds, growth of c-facets consisted of consecutive bursts whose distribution in pressure displayed a strong temperature dependence. The method for measuring small rates of facet growth is described.
- Published
- 1996
306. Investigations on3He crystals using optical interferometry at mK temperatures
- Author
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Pertti Hakonen, G. Tvalashvili, Jussu Ruutu, A. V. Babkin, and Jari Saramäki
- Subjects
Crystal ,Superfluidity ,Interferometry ,Work (thermodynamics) ,Materials science ,Optics ,business.industry ,General Physics and Astronomy ,Heat leak ,business ,Quantum - Abstract
Our recent high-resolution interferometric investigations on4He solid/superfluid interfaces have revealed interesting static and dynamic phenomena in quantum crystals. In this work we have initiated studies of3He crystals and developed a new optical setup which combines two interferometric principles with different resolutions. Our setup allows determination of overall crystal shapes as well as high-resolution studies of facets down to millikelvin temperatures.
- Published
- 1996
307. Spreading of superfluid4He on MgF2
- Author
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Pertti Hakonen, Jari Saramäki, J. P. Ruutu, Harry Alles, A. V. Babkin, and Jarkko Salojärvi
- Subjects
Materials science ,Condensed matter physics ,Thin layer ,General Physics and Astronomy ,Substrate (electronics) ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Contact angle ,Superfluidity ,Hysteresis ,Interferometry ,symbols.namesake ,Helium-4 ,symbols ,General Materials Science ,Wetting ,van der Waals force ,Isotopes of helium ,Stationary state - Abstract
We have performed interferometric experiments on the spreading of superfluid4He on top of a polished fused silica plate which is coated by a thin layer of MgF2. Our measurements indicate that a superfluid4He film of about 100 nm thickness is not able to spread uniformly over a nearly horizontal substrate, and hence these films cannot be governed by the Van der Waals forces only. Nonzero (1–20 mrad) contact angles which display hysteresis, spatial variation, and strong history dependence, are observed even in the stationary state.
- Published
- 1996
308. Spiral growth of c-facets in4He crystals at mK-temperatures
- Author
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A. V. Babkin, Pertti Hakonen, J. P. Ruutu, Alexander Parshin, Jari Penttilä, G. Tvalashvili, and Jari Saramäki
- Subjects
Physics ,Data display ,Condensed matter physics ,Phonon ,media_common.quotation_subject ,General Physics and Astronomy ,chemistry.chemical_element ,Mechanics ,Inertia ,Power law ,chemistry ,Spiral (railway) ,Dislocation ,Saturation (chemistry) ,Helium ,media_common - Abstract
We have made detailed investigations on spiral growth of c-facets in helium crystals with dislocation densities ∼10 cm−2. Our results at high temperaturesT=100–200 mK agree quite well with the classical parabolic power law for spiral growth, whereas a linear dependence on the driving pressure is observed at 2–20 mK. This is a consequence of the inertia of elementary steps in the situation when damping due to phonons is small. At high velocities, all our data display a tendency to saturation which is interpreted as an indication of step localization at large driving forces.
- Published
- 1996
309. Optical observations on 3He-B superfluid
- Author
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A. V. Babkin, Olli V. Lounasmaa, Antti Manninen, Jukka P. Pekola, Harry Alles, J. P. Ruutu, and G.M. Kira
- Subjects
Physics ,Condensed Matter::Quantum Gases ,Condensed matter physics ,Condensed Matter::Other ,Quantum vortex ,Fountain effect ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Vortex ,Superfluidity ,Interferometry ,Viscosity ,Free surface ,Electrical and Electronic Engineering ,Superfluid helium-4 - Abstract
Optical observations on the free surface of superfluid 3He-B have been made using an interferometer. The change in viscosity was seen at the superfluid transition, and the fountain effect in 3He-B was observed directly. The equilibrium average density of vortices was ascertained by looking at the reflection of light from the free surface of the rotating superfluid. Heat leaks due to illumination were investigated. Our results will be illustrated by a video film showing the similarities and differences between the superfluid and the normal liquid.
- Published
- 1994
310. Nonlinear acoustic spectroscopy on the real squashing collective mode in3He-B
- Author
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Harry Alles, A. V. Babkin, K. Torizuka, Antti Manninen, and Jukka P. Pekola
- Subjects
Physics ,Absorption (acoustics) ,Zeeman effect ,Condensed matter physics ,Mode (statistics) ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Magnetic field ,symbols.namesake ,Nonlinear system ,Dispersion relation ,Excited state ,Collective mode ,symbols ,Electrical and Electronic Engineering ,Atomic physics - Abstract
We have excited the real squashing (RSQ) collective modes in 3He-B with two simultaneous ultrasound pulses, yielding two-phonon absorption (TPA). We also detected TPA using single-frequency high-intensity sound pulses. The Zeeman splitting of the parametrically excited RSQ mode has been demonstrated. We checked the dispersion relations of the J=2+ modes in zero magnetic field and extracted the collective mode velocities directly from experiments.
- Published
- 1994
311. Nonlinear acoustical investigations of3He-B near the two-phonon pair breaking edge
- Author
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Jukka P. Pekola, A. V. Babkin, K. Torizuka, and Antti Manninen
- Subjects
Physics ,Coupling ,Condensed matter physics ,business.industry ,Phonon ,Attenuation ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Magnetic field ,Superfluidity ,Nonlinear acoustics ,Optics ,Electrical and Electronic Engineering ,Phase velocity ,Anomaly (physics) ,business - Abstract
We report on experiments using energetic ultrasound pulses on superfluid 3He-B. Near the two-phonon pair breaking edge, at hf=Δ(T), an anomaly in ultrasonic attenuation has been detected. This feature grows with increasing acoustical intensity, and a new peak develops in the attenuation spectrum. The anomaly, coupling nonlinearly to ultrasound, can be observed also in the phase velocity of sound; in a magnetic field the anomaly splits to at least three features.
- Published
- 1994
312. Cooled video camera for optical investigations below 1 mK
- Author
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Pertti Hakonen, Jukka P. Pekola, A. V. Babkin, Antti Manninen, J. P. Ruutu, Harry Alles, Perustieteiden korkeakoulu, School of Science, Department of Applied Physics, Teknillisen fysiikan laitos, Aalto-yliopisto, and Aalto University
- Subjects
Physics ,Cryostat ,surveillance cameras ,business.industry ,Transistor ,Image processing ,Video camera ,Cryogenics ,Integrated circuit ,charge coupled device ,law.invention ,optical investigation changes ,Optics ,law ,Electromagnetic shielding ,superfluid He3 ,Charge-coupled device ,business ,Instrumentation - Abstract
An optical imaging system for milliKelvin temperatures has been developed based on a regular B/W surveillance camera (25 frames/s), with its CCD sensor inside the 4‐K vacuum can of our nuclear demagnetization cryostat. The heat leak to the nuclear stage, caused by the operation of the video camera, was reduced below 1 nW by careful rf shielding. The construction of the system and its limits of operation are discussed.
- Published
- 1994
313. A prestudy of optical imaging on superfluid 3He
- Author
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A. V. Babkin, Antti Manninen, Harry Alles, and Jukka P. Pekola
- Subjects
Physics ,Superfluidity ,Optical imaging ,Optics ,Condensed matter physics ,business.industry ,Thermal radiation ,Free surface ,Electrical and Electronic Engineering ,Condensed Matter Physics ,business ,Electronic, Optical and Magnetic Materials - Abstract
We report on progress in a prestudy concerning the possibility of performing optical imaging of the free surface of rotating superfluid 3He. General problems of optical experiments at milliKelvin temperatures are discussed. Measurements of heat loads caused by illumination and thermal radiation are described.
- Published
- 1992
314. Experimental investigation of the plasma in a multichannel cathode
- Author
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V. G. Mikhalev, G. V. Babkin, A. V. Potapov, and E. P. Morozov
- Subjects
Electron energy ,Materials science ,Mechanical Engineering ,chemistry.chemical_element ,Plasma ,Condensed Matter Physics ,Cathode ,law.invention ,Open-channel flow ,chemistry ,Mechanics of Materials ,law ,Plasma diagnostics ,Lithium ,Atomic physics - Published
- 1977
315. Growth-induced anisotropy in epitaxial crystals of τ-Fe2O3
- Author
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E. V. Babkin, V. G. Pynko, and K. P. Koval
- Subjects
Materials science ,Induced anisotropy ,Condensed matter physics ,Condensed Matter Physics ,Epitaxy ,Electronic, Optical and Magnetic Materials - Published
- 1982
316. Anisotropic magnetocaloric effect in thin magnetic films
- Author
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E. V. Babkin and Kh. O. Urinov
- Subjects
Condensed Matter::Materials Science ,Phase transition ,Materials science ,Condensed matter physics ,Condensed Matter::Superconductivity ,Heat transfer ,Magnetic refrigeration ,General Physics and Astronomy ,Magnetic films ,Anisotropy ,Layered structure - Abstract
We consider the magnetocaloric effect in thin magnetic films. The experimental method is based on heat transfer in a layered structure containing a magnetic film and a film of material with a metal-dielectric phase transition. The anisotropy of the magnetocaloric effect is studied.
- Published
- 1989
317. Dimethyl terephthalate and terephthalic acid for the production of polyester fibres
- Author
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V. V. Babkin, N. I. Mitskevich, and P. N. Zernov
- Subjects
Polyester ,Terephthalic acid ,Dimethyl terephthalate ,chemistry.chemical_compound ,Chemistry ,General Chemical Engineering ,Organic chemistry ,General Materials Science ,General Chemistry - Published
- 1976
318. Epitaxial films of iron oxides grown by the method of chemical transport reaction
- Author
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V. G. Pynko, K. P. Koval, and E. V. Babkin
- Subjects
Materials science ,Inorganic chemistry ,Metals and Alloys ,Iron oxide ,Substrate (chemistry) ,Surfaces and Interfaces ,Atmospheric temperature range ,Epitaxy ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,Carbon film ,chemistry ,Chemical engineering ,Phase (matter) ,Materials Chemistry ,Chemical transport reaction ,Bulk crystal - Abstract
The conditions for epitaxial growth of iron oxide films from the gaseous phase are investigated. A method of chemical transport reaction using a small distance between the source and the substrate was used in preparing the films. It is found that, depending on the technological parameters and the choice of substrate, single-crystal films of Fe 3 O 4 , γ-Fe 2 O 3 or α-Fe 2 O 3 can be obtained. The physical properties of the Fe 3 O 4 and α-Fe 2 O 3 films are identical with those of the bulk crystals. In contrast with the powder-like γ-Fe 2 O 3 , the epitaxial γ-Fe 2 O 3 films are stable over a wider temperature range and may be used for experimental studies of γ-Fe 2 O 3 crystal properties.
- Published
- 1984
319. Investigation of the ionization rate in a low-temperature nonequilibrium plasma flux
- Author
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L. E. Tsvetkova, V. V. Proshkin, A. V. Potapov, and G. V. Babkin
- Subjects
Materials science ,Plasma parameters ,Mechanical Engineering ,General Chemical Engineering ,General Engineering ,Flux ,chemistry.chemical_element ,Plasma ,Condensed Matter Physics ,Reaction rate constant ,chemistry ,Physics::Plasma Physics ,Ionization ,Physics::Space Physics ,Lithium Tokamak Experiment ,Plasma diagnostics ,Lithium ,Physics::Atomic Physics ,Atomic physics - Abstract
Results are presented of a determination of the ionization rate constants of a low-temperature lithium plasma on the basis of measuring the plasma parameters in a longitudinal discharge and of numerical processing of the experimental data.
- Published
- 1975
320. Electric properties of single-crystalline nickel films deposited by the method of chemical transport reactions
- Author
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E. V. Babkin, S. V. Kan, V. G. Pyn'ko, and N. I. Kiselev
- Subjects
Nickel ,Range (particle radiation) ,Materials science ,Path length ,Specularity ,chemistry ,Electrical resistivity and conductivity ,Analytical chemistry ,General Physics and Astronomy ,Electric properties ,chemistry.chemical_element - Abstract
The conditions for obtaining single-crystalline nickel films with a high resistivity ratio at room temperature and at 4.2 K (up to 1000) are described. The thicknesses of the films studied fall in the range 0.7–10 μm. The meanfree path length of the carriers (6–7 μm) and the specularity parameter (0.05) are determined using the Fuks-Sondheimer method.
- Published
- 1986
321. An experimental investigation of the effect of oxygen on the erosion of a multichannel tungsten cathode
- Author
-
G. V. Babkin and A. V. Potapov
- Subjects
Materials science ,Mechanical Engineering ,Metallurgy ,Evaporation ,Refractory metals ,chemistry.chemical_element ,Tungsten ,Condensed Matter Physics ,Alkali metal ,Cathode ,law.invention ,chemistry ,Mechanics of Materials ,Impurity ,law ,Lithium Tokamak Experiment ,Lithium - Abstract
The problem of the preservation of electrodes and the reduction of their depletion to a minimum has decisive significance among the practical questions of maintaining the efficiency of steady sources and plasma accelerators during an extended period of operation. For this purpose electrodes are made, as a rule, out of the refractory metals in familiar designs. In particular, tungsten, which has the highest phase-transition; temperatures among all the metals, thus permitting an appreciable reduction in the evaporation rate of the material under the thermally stressed operating conditions of these devices, is attractive. However, there exist other factors besides evaporation which affect the integrity of hot tungsten electrodes and their ablation (chemical processes, erosion in microarcs, ion bombardment, and so on). One of these factors requiring special investigation is the chemical interaction of tungsten with the oxygen contained in the working medium as an industrial impurity. Such an impurity can, for example, be present in industrially pure alkali and alkali-earth metals used as the working media. In addition, these metals can be contaminated by the oxygen of the air in the process of different industrial operations, in particular, in connection with the servicing of the supply system. The entrance into the working material of oxygen liberated from the structural elements of the supply route and the operating cavities of the plasma source is not excluded. In practice it is impossible to eliminate oxygen, even when using contemporary methods of deep cleaning of lithium, due to its great affinity for oxygen. The actual role of the oxygen impurity and the necessity for taking it into account in connection with the creation and operation of plasma devices can only be revealed as a result of direct experimental investigation on samples having an electrode. geometry similar to the class of sources or accelerators in question. Results are presented in this article of an experimental investigation of the erosion of a multichannel tungsten electrode [1–4] and a coaxial source of lithium plasma [5]. The use of lithium as the main plasma-forming material ensured the maintainance of a discharge distributed over the electrodes and having a small value of the potential drop next to the cathode, which lies below the threshold of cathode erosion upon bombardment of the surface of polycrystalline tungsten by lithium ions [6]. Thus, the phenomena of cathode destruction associated with microarcs and ion bombardment could be exluded from consideration in practice. Thus evaporation and chemical ablation due to interaction with the oxygen of the working medium remain the principal, competing processes contributing to the erosion of the cathode mass. Therefore, in order to obtain reliable quantitative relationships which characterize differential erosion due to oxidation and evaporation, the oxygen content in the working medium was varied in the experiments described within limits extending beyond the framework of the usual industrial impurity, which does not exceed tenths of a percent. One should note that in the process of investigating the role of an industrial oxygen impurity in causing the erosion of a tungsten cathode in a lithium plasma its direct effect was revealed on the anomalous current of a hollow cathode, which is characterized by the recorded average densities of the discharge current exceeding significantly the values of the emission current given at the same surface temperature by the Richardson-Schottky equation [7–9].
- Published
- 1979
322. Distribution features of metallogenic zones of Chukotka
- Author
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A. P. Kuklin, P. V. Babkin, and Ye. P. Kim
- Subjects
Distribution (number theory) ,Geochemistry ,Geology - Published
- 1969
323. Neural Networks as a Tool of Forecasting of Socioeconomic Systems Strategic Development
- Author
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E.P. Karlina, N.S. Epifanova, and A. V. Babkin
- Subjects
Industrial production ,Socioeconomic development ,forecasting ,Demand forecasting ,neural networks ,socioeconomic system ,nonlinearity ,Econometrics ,Gross Regional Product ,Economics ,General Materials Science ,Probabilistic forecasting ,Consensus forecast ,Technology forecasting ,Economic forecasting ,forecasting models - Abstract
When forecasting socio-economic processes it is essential to choose a forecasting method that will objectively reflect the tendencies in development of socio-economic systems. The most common forecasting methods - linear, quadratic, exponential, the autoregressive model and the Holt-Winters forecasting method - are based on extrapolation, i.e. extension of a tendency observed in the past and present to the future. The principal non-linearity in the development of the socioeconomic systems that are managed under conditions of uncertainty and partial observability of the functioning processes, has helped to formulate the expediency of their forecasting based on neural networks. Comparative evaluation of the effectiveness of different forecasting methods is implemented using the example of the Astrakhan region socioeconomic development forecast for 2014-2015. The initial data has been compiled of the GRP (gross regional product), the volume of industrial production, gross agricultural product, the amount of investments in fixed assets, the scope of construction work, the average monthly salary, the CPI (consumer price index) and the unemployment rate in 2001-2012. The minimum value of errors in the regional socio-economic development forecast based on neural networks has showed the higher degree of objectivity in the results of neural network forecasting in comparison with other methods.
- Full Text
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324. Comparative Assessment of Innovative Activity of Region's Economy Actors on the Basis of the Triple Helix Model
- Author
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A. V. Babkin, G.S. Kovrov, N.E. Egorov, and S.V. Muraveva
- Subjects
Government ,Basis (linear algebra) ,innovative “portrait” of the region ,media_common.quotation_subject ,system of indicators ,econometric model ,Outcome (game theory) ,Econometric model ,State (polity) ,Economy ,Ranking ,Quantitative assessment ,Economics ,General Materials Science ,Real economy ,Triple Helix ,media_common - Abstract
The paper demonstrates an econometric method of quantitative assessment of innovative activity of region's economy actors of different levels on the basis of innovation dimensional space model, allowing to assess the role of every Triple Helix participant in the innovative development of the region as a whole, as well as broken down to a specific municipality, real economy sector, territory-specific innovative clusters etc. Regions of Far-East Federal District of the Russian Federation (FEFD) are taken to illustrate the research subject. The paper shows the results of numeric calculations related to express-analysis of the contribution of the main innovation actors – science/education, business, state – to the innovative development of the regions on the basis of 2012 statistics. It can be seen that the general level of innovative development of regions’ economy of the district under analysis is mainly determined by the innovative activity of science/education. This outcome indicates insufficient mobilization and application of the creations of human mind, made in the universities and R&D centers, in the development of the region's innovative activity. Ranking comparative analysis demonstrates, that the ranking, made according to the method of the authors, reflects the innovative development of FEFD actors in general and does not differ much from the results of other rankings, which proves this method effective. The proposed method and outcomes of the econometric calculation may be used by executive bodies of the government, business entities, research centers and educational establishments to take various managerial decisions about innovative development of region's economy, strategies and economy development programs of different levels.
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325. Performance of the oxidation columns in the dimethyl terephthalate section
- Author
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N. D. Kudryashova, I. V. Kudryavtsev, N. T. Faldina, P. N. Zernov, V. V. Babkin, Ya. A. Shubin, N. I. Mitskevich, and B. G. Balkov
- Subjects
chemistry.chemical_classification ,Dimethyl terephthalate ,chemistry.chemical_compound ,Materials science ,chemistry ,Section (archaeology) ,General Chemical Engineering ,General Materials Science ,General Chemistry ,Polymer ,Composite material - Published
- 1974
326. Technique of measuring electron concentration in a lithium plasma flux
- Author
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S. N. Ogorodnikov, V. G. Pankratov, E. P. Morozov, G. V. Babkin, and V. G. Mikhalev
- Subjects
Materials science ,Electron concentration ,Analytical chemistry ,Lithium Tokamak Experiment ,Condensed Matter Physics ,Flux (metabolism) ,Spectroscopy - Published
- 1973
327. Effect of surface and volume ionization on the electrode potential drop
- Author
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A. V. Potapov and G. V. Babkin
- Subjects
Materials science ,Standard hydrogen electrode ,Physics::Instrumentation and Detectors ,Mechanical Engineering ,Plasma ,Condensed Matter Physics ,Half-cell ,Ion source ,Anode ,Physics::Plasma Physics ,Mechanics of Materials ,Ionization ,Physics::Atomic Physics ,Atomic physics ,Current density ,Electrode potential - Abstract
We consider the change in the potential of the electric field in the “free fall” layer at the electrodes as a function of the characteristics of the surface and the volume ionization. Systematic calculations are made of the electrode potential drop for a tungsten cathode and anode in a lithium and cesium plasma. The potential of the electric field is obtained as a function of the plasma pressure, the degree of volume ionization, the electron temperature, the electrode temperature, and the current density.
- Published
- 1973
328. [Intraoperative pH-metry in selective proximal vagotomy]
- Author
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P M, Postolov, N M, Kuzin, and O V, Babkin
- Subjects
Male ,Duodenal Ulcer ,Humans ,Female ,Gastric Acidity Determination ,Hydrogen-Ion Concentration ,Vagotomy ,Histamine - Published
- 1979
329. [Perioperative determination of completeness of vagotomy]
- Author
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M I, Kuzin, Iu M, Pantsyrev, P M, Postolov, A V, Vakhrushev, and O V, Babkin
- Subjects
Gastric Mucosa ,Esophageal Stenosis ,Stomach Diseases ,Humans ,Constriction, Pathologic ,Hydrogen-Ion Concentration ,Vagotomy - Published
- 1978
330. [Selective proximal vagotomy in patients with high indices of gastric secretion]
- Author
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P M, Postolov, N M, Kuzin, and O V, Babkin
- Subjects
Adult ,Gastric Acid ,Male ,Peptic Ulcer ,Recurrence ,Chronic Disease ,Humans ,Postoperative Period ,Middle Aged ,Vagotomy ,Vagotomy, Proximal Gastric - Published
- 1980
331. Complex Modeling of the Economic Systems Stability.
- Author
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E L Toroptsev, A S Marahovskiy, and A V Babkin
- Published
- 2019
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332. Kinetics of the Adsorption of Synthetic Dyes on a Polyhydroquinone/Graphene Carbon Nanocomposite.
- Author
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A V Babkin, A V Melezhik, D A Kurnosov, E S Mkrtchyan, I V Burakova, A E Burakov, and E V Galunin
- Published
- 2019
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333. Adsorption of the Methylene Blue Dye on Carbon Nanocomposites Under Dynamic Conditions: A Kinetic Study.
- Author
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I V Burakova, A V Babkin, E A Neskoromnaya, A E Burakov, D A Kurnosov, and A G Tkachev
- Published
- 2019
- Full Text
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334. Utilization of conductance boxes in testing 127 V transformers
- Author
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V. V. Babkin
- Subjects
Materials science ,law ,Applied Mathematics ,Nuclear engineering ,Conductance ,Transformer ,Instrumentation ,law.invention - Published
- 1977
335. Latent fluctuation periods and long-term forecasting of the level of Markakol lake.
- Author
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A S Madibekov, A V Babkin, A Musakulkyzy, and A V Cherednichenko
- Published
- 2018
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336. Economic Evaluation of the Information Security Levels Achieved by Electric Energy Providers in North Arctic Region.
- Author
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O P Sushko, A A Kaznin, A V Babkin, and D A Bogdanov
- Published
- 2017
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337. Vegetable phenols as effective inhibitors of thermal polymerization for petrochemical plants.
- Author
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A. Gogotov, V. Babkin, A. Levchuk, and L. Ostroukhova
- Subjects
- *
PHENOLS , *POLYMERIZATION , *CHEMICAL composition of plants , *VEGETABLES - Abstract
- Published
- 2007
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338. CONCEPTUAL FOUNDATIONS OF MULTIDIMENSIONAL SYSTEM MODELING OF THE MECHANISM OF SUSTAINABLE ESGС DEVELOPMENT OF A CLUSTER-TYPE CYBERSOCIAL INDUSTRIAL ECOSYSTEM
- Author
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Aleksandr V. Babkin and Luiza R. Batukova
- Subjects
industrial ecosystem ,industrial cluster ,sustainable esgc development ,modeling of economic systems ,digital transformation ,digital platform ,digital image ,acceleration of innovation processes ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Background. Since the beginning of the 21st century, the world system of financial, economic and economic relations has been objectively evolving towards the formation of a post-industrial integral cyber-formation production method. This serves as a basis for talking about the onset of the era of the eponymous Integral Cyber Formation Society. The complexity of the tasks to be solved by the state and society in the course of the upcoming changes requires new approaches to organizing industry, including the use of cyber-social industrial ecosystems and mechanisms for sustainable ESGC development. The purpose of the study is to develop in the system paradigm the conceptual foundations of the mechanism of sustainable ESGC-development of the cluster-type cybersocial industrial ecosystem, as well as the justification of the need for multidimensional system modeling of this mechanism for the design of its relevant digital image. Materials and methods. The study was conducted in a system paradigm based on system theory and a system approach. To study the causes of historical evolutionary changes in economic and economic mechanisms, general scientific methods of analysis and synthesis, and system-organizational analysis tools were used. During the analysis of the actual material and to present the results, the method of structural and logical modeling and visualization of the conceptual foundations of economic and economic systems was used. Results. The main results are: a model of the organizational mechanism of the cybersocial industrial cluster, which determines the conceptual essence of the multidimensional system modeling of the mechanism of sustainable ESGC-development of the cybersocial industrial ecosystem of the cluster type; the concept of a new, engineering approach to the design and modeling of cluster-type cybersocial industrial ecosystems based on the theoretical and methodological basis of the system paradigm. Conclusions. The proposed conceptual foundations of multidimensional system modeling of the mechanism of sustainable ESGC-development of a cluster-type cybersocial industrial ecosystem will contribute to the development of the digital industry economy and increase its efficiency.
- Published
- 2023
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339. ASSESSMENT OF SUSTAINABILITY AND EFFECTIVENESS OF INNOVATIVE DEVELOPMENT OF ECONOMIC AGENTS OF THE RUSSIAN ARCTIC
- Author
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Nikolay E. Egorov, Alexander V. Babkin, Ivan A. Babkin, and Alexey B. Martynushkin
- Subjects
regions ,innovative development ,determination of the level of sustainability of innovative development of the region ,trends ,forecast calculations ,Social Sciences - Abstract
Based on the selected key indicators in the innovation sphere, an integral rating assessment of the level of innovative development (IRR) of the Arctic Zone of the Russian Federation for the period 2015–2019 was carried out and their innovative profiles were constructed, allowing to identify the strengths and weaknesses of the innovative potential of the subjects. On the basis of comparative ratings, the sufficiency of using the number of indicators for calculations and analysis of the obtained research results is justified. The rating assessment showed the leading position of the Krasnoyarsk Territory, the outsiders of the ranking include the Chukotka and Nenets Autonomous Okrugs. The authors propose a method for determining the level of sustainability of the IRR, which is calculated according to the consolidated integral index of innovative development of the region. The proposed methodological approach is based on the use of the coefficient of variation, well-known in the field of probability theory and statistics, and can be used to assess the innovation sustainability not only of regions, but also for other sectors of the economy and social sphere with corresponding changes in the system of indicators reflecting their production and economic activities. On the basis of input and output parameters, a rating of the effectiveness of innovative activity of the regions is compiled and the possibility of predictive assessments of its level for the future is shown. It is noted that in addition to the regional authorities, the results of the study can be used by various economic and social actors to monitor and forecast innovative development, as well as to adjust the existing regulatory documents in the field of innovation policy.
- Published
- 2022
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340. Role of Ixodes Pavlovskyi (Acari, Ixodidae) in Borreliosis Epizootic Process at the Island Russky
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A. Ya. Nikitin, Yu. V. Sabitova, V. A. Rar, I. М. Morozov, N. S. Gordeiko, A. V. Allenov, G. B. Kaverina, I. V. Babkin, N. V. Tikunova, and E. I. Andaev
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ixodiс tick-borne borrelioses, ixodes tick, borrelia genospecies, tick infection, island russky ,Infectious and parasitic diseases ,RC109-216 - Abstract
The incidence of Ixodes tick-borne borreliosis (ITBB) at the Island Russky (Primorsk Territory) is higher than at the mainland. There is a bidominant structure of the tick population with mass occurrence of Ixodes persulcatus and I. pavlovskyi at the island. Due to the higher infectivity and aggressiveness of I. persulcatus, it is suggested that it plays a key role in high activity of the ITBB focus at the island.The aim of the study: to characterize the role of I. pavlovskyi in the borreliosis epizootic process based on the study of the structure of the borrelia genotype complex isolated from Ixodes ticks at the Island Russky.Materials and methods. The ticks were collected from vegetation at three sites. Ixodide species were determined morphologically and using PCR for mitochondrial gene cox1 and nuclear multicopy locus ITS2. Infection of 233 ticks was analyzed with the species identification confirmed by all methods. Borrelia genospecies were determined by multiplex two-round PCR with the primers specific to the gene fragments 5S and 23S rRNA of Borrelia burgdorferi sensu lato complex.Results and discussion. Coexistence of I. persulcatus and I. pavlovskyi at the island was confirmed, with different ratios in space and a gradual increase in the proportion of the latter species. The circulation of three etiological agents of ITBB: Borrelia garinii (predominantly in I. pavlovskyi), B. bavariensis and B. afzelii (in I. persulcatus) was identified. Thus, an active natural focus of ITBB has formed at the island, probably including two uninsulated chains of borrelia circulation. One chain combines I. persulcatus and small and large mammals as the tick feeders. The second – I. pavlovskyi that can feed on mammals and birds. Due to the spatial variability of the ixodide population structure at different sections of the island, the ratio of the circulating borrelia species can change, and this species becomes the main vector of the pathogenic agents in areas of I. pavlovskyi absolute dominance.
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- 2021
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341. Engendering High Energy Density LiFePO4 Electrodes with Morphological and Compositional Tuning
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Aleksei V. Kubarkov, Alexander V. Babkin, Oleg A. Drozhzhin, Keith J. Stevenson, Evgeny V. Antipov, and Vladimir G. Sergeyev
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Li-ion battery ,LFP ,carbon nanotube ,particle morphology ,current collector ,carbon coating ,Chemistry ,QD1-999 - Abstract
Improving the energy density of Li-ion batteries is critical to meet the requirements of electric vehicles and energy storage systems. In this work, LiFePO4 active material was combined with single-walled carbon nanotubes as the conductive additive to develop high-energy-density cathodes for rechargeable Li-ion batteries. The effect of the morphology of the active material particles on the cathodes’ electrochemical characteristics was investigated. Although providing higher packing density of electrodes, spherical LiFePO4 microparticles had poorer contact with an aluminum current collector and showed lower rate capability than plate-shaped LiFePO4 nanoparticles. A carbon-coated current collector helped enhance the interfacial contact with spherical LiFePO4 particles and was instrumental in combining high electrode packing density (1.8 g cm−3) with excellent rate capability (100 mAh g−1 at 10C). The weight percentages of carbon nanotubes and polyvinylidene fluoride binder in the electrodes were optimized for electrical conductivity, rate capability, adhesion strength, and cyclic stability. The electrodes that were formulated with 0.25 wt.% of carbon nanotubes and 1.75 wt.% of the binder demonstrated the best overall performance. The optimized electrode composition was used to formulate thick free-standing electrodes with high energy and power densities, achieving the areal capacity of 5.9 mAh cm−2 at 1C rate.
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- 2023
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342. Special Issue 'Bacteriophage Genomics': Editorial
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Igor V. Babkin and Nina V. Tikunova
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n/a ,Biology (General) ,QH301-705.5 - Abstract
Virus genomics as a separate branch of biology has emerged relatively recently [...]
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- 2023
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343. The Physicochemical Characterization of New 'Green' Epoxy-Resin Hardener Made from PET Waste
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Grigorii K. Sterligov, Sergey A. Rzhevskiy, Dilshodakhon K. Isaeva, Nikita M. Belov, Maria A. Rasskazova, Egor A. Drokin, Maxim A. Topchiy, Lidiya I. Minaeva, Alexander V. Babkin, Erdni M. Erdni-Goryaev, Alexey V. Kepman, and Andrey F. Asachenko
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polyethylene terephthalate ,PET waste ,epoxy matrix ,new hardener ,recycling ,Organic chemistry ,QD241-441 - Abstract
“Green” thermally stable hardener was synthesized from a PET waste. The rigid molecular linear structure of the new hardener suggests that it will provide the polymer matrix with the necessary physical and mechanical characteristics. It also allows the expectation that cured matrix based on this hardener can provide increased toughness. New hardener was used as a curing agent for three epoxy resins—tetraglycidyl methylenedianiline (TGDMA, 111–117 EEW), diglycidylether of bisphenol A (DGEBA, 170-192 EEW) and solid epoxy resin (SER)—with a medium molecular weight (860–930 EEW) based on DGEBA. The mixtures were found to have the highest Tg for the DGEBA resin, and high of that for TGDMA and SER. According to the DMA analysis for two cured matrices, the hardener proved to be no worse than the standard ones, and made it possible to obtain cured matrices with excellent mechanical properties, which allows us to hope for further application of new hardener cured epoxy matrices in appropriate composite materials at high temperatures.
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- 2022
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344. Polyaniline Modified CNTs and Graphene Nanocomposite for Removal of Lead and Zinc Metal Ions: Kinetics, Thermodynamics and Desorption Studies
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Imran Ali, Tatiana S. Kuznetsova, Alexander E. Burakov, Irina V. Burakova, Tatiana V. Pasko, Tatiana P. Dyachkova, Elina S. Mkrtchyan, Alexander V. Babkin, Alexey G. Tkachev, Hassan M. Albishri, Wael Hamad Alshitari, Ahmed M. Hameed, and Ahmed Alharbi
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polyaniline-CNTs-graphene nanocomposite ,heavy metal ions removal ,adsorption ,kinetics ,thermodynamics ,Organic chemistry ,QD241-441 - Abstract
A novel polyaniline-modified CNT and graphene-based nanocomposite (2.32–7.34 nm) was prepared and characterized by spectroscopic methods. The specific surface area was 176 m2/g with 0.232 cm3/g as the specific pore volume. The nanocomposite was used to remove zinc and lead metal ions from water; showing a high removal capacity of 346 and 581 mg/g at pH 6.5. The data followed pseudo-second-order, intraparticle diffusion and Elovich models. Besides this, the experimental values obeyed Langmuir and Temkin isotherms. The results confirmed that the removal of lead and zinc ions occurred in a mixed mode, that is, diffusion absorption and ion exchange between the heterogeneous surface of the sorbent containing active adsorption centers and the solution containing metal ions. The enthalpy values were 149.9 and 158.6 J.mol−1K−1 for zinc and lead metal ions. The negative values of free energies were in the range of −4.97 to −26.3 kJ/mol. These values indicated an endothermic spontaneous removal of metal ions from water. The reported method is useful to remove the zinc and lead metal ions in any water body due to the high removal capacity of nanocomposite at natural pH of 6.5. Moreover, a low dose of 0.005 g per 30 mL made this method economical. Furthermore, a low contact time of 15 min made this method applicable to the removal of the reported metal ions from water in a short time. Briefly, the reported method is highly economical, nature-friendly and fast and can be used to remove the reported metal ions from any water resource.
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- 2022
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345. Ionomers Based on Addition and Ring Opening Metathesis Polymerized 5-phenyl-2-norbornene as a Membrane Material for Ionic Actuators
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Oleg S. Morozov, Alexander V. Babkin, Anna V. Ivanchenko, Svetlana S. Shachneva, Sergey S. Nechausov, Dmitry A. Alentiev, Maxim V. Bermeshev, Boris A. Bulgakov, and Alexey V. Kepman
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ion exchange membrane ,ionomer ,sulfonated polymer ,electroactive polymer ,carbon nanotube ,ionic liquid ,Chemical technology ,TP1-1185 ,Chemical engineering ,TP155-156 - Abstract
Two types of poly(5-phenyl-2-norbornene) were synthesized via ring opening metathesis and addition polymerization. The polymers sulfonation reaction under homogeneous conditions resulted in ionomer with high sulfonation degree up to 79% (IEC 3.36 meq/g). The prepared ionomer was characterized by DSC, GPC, 1H NMR and FT-IR. Polymers for electromechanical applications soluble in common polar organic solvents were obtained by replacing proton of sulfonic group with imidazolium and 1-methylimidazlium. Membranes were prepared using the above-mentioned polymers and 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4), as well as mixtures with polyvinylidene fluoride (PVDF). Mechanical, morphological, and conductive properties of the membranes were examined by tensile testing, SEM, and impedance spectroscopy, respectively. Dry and air-stable actuators with electrodes based on SWCNT were fabricated via hot-pressing. Actuators with membranes based on methylimidazolium containing ionomers outperformed classical bucky gel actuator and demonstrated high strain (up to 1.14%) and generated stress (up to 1.21 MPa) under low voltage of 2 V.
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- 2022
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346. Effect of Different Pore-Forming Additives on the Formation of PVDF Microporous Membranes for Bucky-Gel Actuator
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O. S. Morozov, S. S. Shachneva, B. A. Bulgakov, A. V. Babkin, and A. V. Kepman
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Chemistry ,QD1-999 - Abstract
The microporous polyvinylidene fluoride (PVDF) membranes were prepared by the solvent evaporation method using 50 wt.% of different pore-forming additives: poly(1-ethyl-3-vinylimidazolium tetrafluoroborate) (PIL-BF4), polyethylene glycol 3000 (PEG-3K) and 40000 (PEG-40K), dibutyl phthalate (DBP). The influence of used additive on morphology, porosity, degree of crystallinity, tensile properties, electrolyte uptake and ionic conductivity of the membranes were investigated. The maximum electrolyte uptake of 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4) was 184 wt.% for the membrane prepared with PEG-40K, however, the membrane was fragile and unsuitable for practical use. The remaining membranes showed approximately the same porosity (45‒48%) and electrolyte uptakes (169‒175%). At the same time, the membranes significantly differed in mechanical properties and ionic conductivity. The membrane prepared with PIL-BF4, unlike others, has a sponge-like structure and demonstrated high mechanical properties, namely tensile strength is 17.7 MPa and fracture strain is 132.5%. Bucky gel actuators were fabricated using membranes prepared with different additives. The blocking force of the actuators based on membranes with different additives decreased in the sequence of PIL-BF4, DBP and PEG. The actuator based on the membrane prepared with PIL-BF4 demonstrates a blocking force of 5.7 mN and a deformation of 1.35 % at 3 V DC.
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- 2020
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347. An Update of Orthopoxvirus Molecular Evolution
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Igor V. Babkin, Irina N. Babkina, and Nina V. Tikunova
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variola virus ,orthopoxvirus ,evolution ,origin ,Microbiology ,QR1-502 - Abstract
Although variola virus (VARV) has been eradicated through widespread vaccination, other orthopoxviruses pathogenic for humans circulate in nature. Recently, new orthopoxviruses, including some able to infect humans, have been found and their complete genomes have been sequenced. Questions about the orthopoxvirus mutation rate and the emergence of new threats to humankind as a result of the evolution of circulating orthopoxviruses remain open. Based on contemporary data on ancient VARV DNA and DNA of new orthopoxvirus species, an analysis of the molecular evolution of orthopoxviruses was carried out and the timescale of their emergence was estimated. It was calculated that the orthopoxviruses of the Old and New Worlds separated approximately 40,000 years ago; the recently discovered Akhmeta virus and Alaskapox virus separated from other orthopoxviruses approximately 10,000–20,000 years ago; the rest of modern orthopoxvirus species originated from 1700 to 6000 years ago, with the exception of VARV, which emerged in approximately 300 AD. Later, there was a separation of genetic variants of some orthopoxvirus species, so the monkeypox virus West African subtype originated approximately 600 years ago, and the VARV minor alastrim subtype emerged approximately 300 years ago.
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- 2022
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348. Hydrolysis rate constants and activation parameters for phosphate- and phosphonate-bridged phthalonitrile monomers under acid, neutral and alkali conditions
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Kirill S. Belsky, Artem V. Sulimov, Boris A. Bulgakov, Alexandr V. Babkin, and Alexey V. Kepman
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Computer applications to medicine. Medical informatics ,R858-859.7 ,Science (General) ,Q1-390 - Abstract
Hydrolysis data for Bis(3-(3,4-dicyanophenoxy)phenyl) phenyl phosphate and Bis(3-(3,4-dicyanophenoxy)phenyl) phenylphosphonate under pH 4, 7 and 10 are presented. Conversion/time plots collected by HPLC analysis, typical chromatograms and NMR spectra of the reactions products are given. Pseudo-first order rate constants are determined for both substrates at 25, 50 and 80 °C. Activation parameters were calculated from Arrhenius equation. Keywords: Hydrolysis, Phthalonitrile, Phosphoric ester, Phosphonic ester, Rate constant, Activation energy
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- 2017
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349. DISTANT DAMAGES IN PATIENTS WITH TRAUMATIC DISEASE OF SPINAL CORD
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O. I. Dulub, I. A. Il'yasevich, S. A. Korchevsky, and A. V. Babkin
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pinal cord ,distant damages ,treatment ,Orthopedic surgery ,RD701-811 - Abstract
Were marked 3 groups of patients with distant damages of spine: with develope of it at early time after vertebro-spinal cord trauma, posttraumatic distant myelopathy and posttraumatic syringogydromyelia. Develope of distant damage was in 54 patients and it was by high powerfulls traumatic action, ft connected to a hard prime damage of spinal cord (79.6% had a completely disturbance of spine cord conduction). Periods of improvement conductions changed for the worse. Confirmation of defeation and level of disturbance of spine cord conduction were done by MRI and different methods of electrophysiology. Medical support and surgical operations (decompressive and bypass operations) guarantee the positive neurological results gettin almost patients.
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- 2016
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350. The Origin of the Variola Virus
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Igor V. Babkin and Irina N. Babkina
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variola virus ,orthopoxvirus ,evolution ,origin ,Microbiology ,QR1-502 - Abstract
The question of the origin of smallpox, one of the major menaces to humankind, is a constant concern for the scientific community. Smallpox is caused by the agent referred to as the variola virus (VARV), which belongs to the genus Orthopoxvirus. In the last century, smallpox was declared eradicated from the human community; however, the mechanisms responsible for the emergence of new dangerous pathogens have yet to be unraveled. Evolutionary analyses of the molecular biological genomic data of various orthopoxviruses, involving a wide range of epidemiological and historical information about smallpox, have made it possible to date the emergence of VARV. Comparisons of the VARV genome to the genomes of the most closely related orthopoxviruses and the examination of the distribution their natural hosts’ ranges suggest that VARV emerged 3000 to 4000 years ago in the east of the African continent. The VARV evolution rate has been estimated to be approximately 2 × 10−6 substitutions/site/year for the central conserved genomic region and 4 × 10−6 substitutions/site/year for the synonymous substitutions in the genome. Presumably, the introduction of camels to Africa and the concurrent changes to the climate were the particular factors that triggered the divergent evolution of a cowpox-like ancestral virus and thereby led to the emergence of VARV.
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- 2015
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