Tychinsky V.P.,Moscow Institute of Radioengineering |
Vyshenskaya T.V.,Moscow State University |
Terpigorev S.A.,Mf Vladirairsky Moscow Region Research Clinical Institute |
Vasilenko I.A.,Russian Gerontological Research Center |
And 4 more authors.
Vestnik Rossiiskoi Akademii Meditsinskikh Nauk | Year: 2011
Investigation of initial stages of T-lymphocytes activation was performed by coherent phase microscopy (CPM) based on the measurements of phase thickness and diameter of the cell and its organelles. Lymphocytes where activated in two ways: by addition of 2 10-6 g/ml phytohemagglutinin (PHA) and with He-Ne laser (X=633 nm, 10-3 W) radiation. It was shown that phase thickness is proportional to refractivity (difference between refractive indices of an object and the surrounding medium) and geometrical thickness. Phase thickness decreased during activation independently of the nature of the stimuli. Phase thickness in healthy donors was 220+60 nm; decreased to 110+30nm lh after addition of PHA. The same values were achieved 30 min after stimulation with the He-Ne laser. Characteristic changes in phase thickness in the nucleus and nucleolus were observed after lymphocytes were stimulated with the laser.
Bratkovsky A.M.,Hewlett - Packard |
Levanyuk A.P.,Hewlett - Packard |
Levanyuk A.P.,Autonomous University of Madrid |
Levanyuk A.P.,Moscow Institute of Radioengineering
Physical Review B - Condensed Matter and Materials Physics | Year: 2011
We study cubic ferroelectrics films that become uniaxial with a polar axis perpendicular to the film because of a misfit strain due to the substrate. The main present result is the analytical account for the elastic anisotropy as well as the anisotropy of the electrostriction. They define, in particular, the orientation of the domain boundaries and the stabilizing or destabilizing effect of inhomogeneous elastic strains on the single domain state. We apply the general results to perovskite systems like BaTiO3/SrRuO 3/SrTiO3 films and find that, at least not far from the ferroelectric phase transition, the equilibrium domain structure consists of the stripes along the cubic axes or at 45° to them. We also show that, in this system, the inhomogeneous strains increase stability with regard to small fluctuations of the metastable single domain state, which may exist not very close to the ferroelectric transition. The latter analytical result is in qualitative agreement with the numerical result by Pertsev and Kohlstedt but we show that the effect is much smaller than those authors claim. We find also that under some conditions on the material constants, which are not satisfied in perovskites but are not forbidden, in principle, instead of the striped-like domain structure a checkerboard one can be realized and the polarization-strain coupling decreases the stability of a single domain state instead of increasing it. © 2011 American Physical Society.
Altukhov A.A.,OOO TsNITI Tekhnomash |
Teplova T.B.,Moscow Institute of Steel And Alloys |
L'vov S.A.,Moscow Institute of Steel And Alloys |
Gladchenkov E.V.,OOO PTTs UralAlmazInvest |
Afanas'ev S.A.,Moscow Institute of Radioengineering
Russian Engineering Research | Year: 2016
In mining, it is important to improve the precision of geophysical instruments in mineral prospecting, especially in the exploration of oil and gas fields. The possibility of creating instruments for monitoring the neutron yield of a borehole neutron generator in neutron–neutron logging systems is considered. One possibility is to employ detectors based on natural diamonds, which are a valuable resource. Their use in hightech geophysical instruments for prospecting may be regarded as a valuable step in the efficient utilization of natural resources, which is an important goal at this time. Experience shows that Russian-made diamond detectors of the proposed design are satisfactory replacements for the instruments currently used to monitor the yield of a borehole neutron generator in neutron–neutron logging systems. Tests of the detectors in the AINK-43M pulsed neutron–neutron logging system demonstrate the improved productivity and precision of the measurement system. © 2016, Allerton Press, Inc.
Bush A.A.,Moscow Institute of Radioengineering |
Glazkov V.N.,RAS Institute of Solid State Physics |
Hagiwara M.,Osaka University |
Kashiwagi T.,University of Tsukuba |
And 6 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2012
We present the results of the magnetization and dielectric constant measurements on untwinned single-crystal samples of the frustrated S=1/2 chain cuprate LiCu 2O 2. Magnetic phase transitions were observed. A spin-flop transition of the spiral spin plane was observed for the field orientations Ha, b. The second magnetic transition was observed at H-15 T for all three principal field directions. This high-field magnetic phase is discussed as a collinear spin-modulated phase, which is expected for an S=1/2 nearest-neighbor ferromagnetic and next-nearest-neighbor antiferromagnetic chain system. © 2012 American Physical Society.
Gippius A.A.,Moscow State University |
Tkachev A.V.,Moscow State University |
Gervits N.E.,Moscow State University |
Pokatilov V.S.,Moscow Institute of Radioengineering |
And 2 more authors.
Solid State Communications | Year: 2012
BiFeO 3 is a perovskite-like compound with magnetic and electrical long-range order with antiferromagnetic transition temperature about 670 K. It has space modulated magnetic structure of cycloidal type with the period λ=620±20 incommensurate with the lattice parameter leading to specific NMR line shape. Substitution of strontium for bismuth atoms destroys the space modulated structure. Several samples with substitution of strontium for bismuth Bi 1-xSr xFeO 3 were studied by means of zero field NMR and Mssbauer spectroscopy. A significant broadening of 57Fe NMR spectrum was observed at x=0.10 while Mssbauer spectroscopy demonstrates this effect at x=0.07. This phenomena evidence for the destruction of the spatial modulated magnetic structure at x∼0.070.10 by the heterovalent substitution of strontium for bismuth without the destruction of crystal rhombohedral structure. © 2011 Elsevier Ltd. All rights reserved.
Sapoletova N.,Moscow State University |
Makarevich T.,Moscow Institute of Radioengineering |
Napolskii K.,Moscow State University |
Mishina E.,Moscow Institute of Radioengineering |
And 4 more authors.
Physical Chemistry Chemical Physics | Year: 2010
The kinetics of nickel electrodeposition through a template of ordered polystyrene spheres is addressed experimentally and applied to prepare a series of metallic inverse opals with a non-integer number of layers. The observed layer-by-layer growth is discussed in terms of subsequently increasing disorder of the growth front. Reflection and transmission spectra of the samples demonstrate that the key optical features of these photonic crystals are most pronounced when the thickness does not essentially exceed two layers. The intensities and band positions can be additionally tuned by varying the height of the metal coating continuously, not discretely. These findings are confirmed semi-quantitatively by means of computational modeling of the spectra. Specific deposition current transients for in situ control of geometric parameters are discussed. © 2010 the Owner Societies.
Tychinsky V.,Moscow Institute of Radioengineering |
Kretushev A.V.,Moscow Institute of Radioengineering |
Klemyashov I.V.,Moscow Institute of Radioengineering |
Zverzhkhovskiy V.D.,Moscow Institute of Radioengineering |
And 2 more authors.
Journal of Biomedical Optics | Year: 2013
We applied coherent phase microscopy to develop a method of quantitative evaluation of functional state of eukaryotic cells using the coordinates of characteristic points (CP) in the functions of the phase volume W and area S. In a fragment of a single cell image (HCT116 human colon carcinoma cell line) with detectable nucleolus, the values of the phase thickness, area, and volume were calculated. These values dramatically changed within the initial minutes of cell exposure to the transcriptional inhibitor actinomycin D. The positions of CP in the graphs of S and W functions allowed for monitoring the time-dependent decrease of nucleolar contrast, a major optical hallmark of "nucleolar stress." Given that the area and volume functions reflect optical heterogeneity of the cell and are independent of its optical model, these functions can be applicable as general mathematical tools for the analysis of cell morphology and physiology. © The Authors.
Buryakov A.,Moscow Institute of Radioengineering |
Ivanov M.S.,Moscow Institute of Radioengineering |
Mishina E.D.,Moscow Institute of Radioengineering
Solid State Communications | Year: 2015
This work is devoted to research an influence of Ba cation concentration on polarization properties of ferroelectric layer which is included in bilayer structures as functional stratum. We have created bilayer nanocomposites consisting of a ferroelectric Ba(x)Sr(1-x)TiO3 (BST) layer and a ferromagnetic La0.7Sr0.3MnO3 (LSMO) layer with various concentrations of Ba. The epitaxial heterostructure BST/LSMO was fabricated using metal-organic aerosol deposition technique (MAD) on a single-crystal substrate SrTiO3 (001). The structural parameters of the BST/LSMO were defined by X-ray diffraction analysis. The in-plane ferroelectric polarization, measured by means of optical second harmonic generation (SHG) method, was shown to be strongly dependent on the Ba concentration. We consider this effect as structural distortion at room temperatures which close to the structural phase transition and altering the Ba concentration affects the vicinity to the phase transition point. © 2015 Elsevier Ltd. All rights reserved.
Emelin E.,Russian Academy of Sciences |
Roshchupkin D.,Russian Academy of Sciences |
Lavrov S.,Moscow Institute of Radioengineering |
Ilyin N.,Moscow Institute of Radioengineering |
Kudryavtsev A.,Moscow Institute of Radioengineering
2013 Joint IEEE International Symposium on Applications of Ferroelectric and Workshop on Piezoresponse Force Microscopy, ISAF/PFM 2013 | Year: 2013
Regular domain structures were formed at the 127° Y′-cut of a LiTaO3 crystal by direct e-beam writing. The study of regular domain structures was carried out by selective chemical etching method and by nonlinear optics methods. The domain lines consists of single triangular domains merged together (base-to-apex). The domain distribution inside the LiTaO3 127° Y′-cut occurs at the angle 37° to the irradiated surface and exhibits a distinct anisotropy in the crystallographic directions. Depending on the direction of e-beam movement along the irradiated surface, the threshold density of the introduced charge necessary for the inversion of the crystal spontaneous polarization changes by an order of magnitude. © 2013 IEEE.
PubMed | Moscow Institute of Radioengineering
Type: Journal Article | Journal: Journal of biological physics | Year: 2013
We study theoretical and numerical propagation of autowave fronts in excitable two-variable (activator-inhibitor) systems with anisotropic diffusion. A general curvature-velocity relation is derived for the case that the inhibitor diffusion is neglected. This relation predicts the break of an activation front when the front curvature exceeds a critical value, which is corroborated by computer simulations of a particular reaction-diffusion model. Some qualitative effects associated with the inhibitor diffusion are studied numerically. It is found that the critical value of curvature decreases with an increase in the inhibitor diffusion coefficient. The core of a spiral wave increases in size and turns through an angle which depends on the inhibitor diffusion coefficient. PACS Numbers: 05.50. +q, 05.70. Ln., 82.40. -g, 87.10. +e.