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Search Results: 1 - 10 of 130478 matches for " V. Egorov "
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Discovery of a Planar Waveguide for an X-Ray Radiation
V. Egorov,E. Egorov
Physics , 2001,
Abstract: A simple model of X-Ray standing waves (XSW) formation in the slit of a planar waveguide of X-Ray radiation beam for the angle area restricted by the critical total reflection angle is developed. It is shown that the model is true for a case of the Bragg reflection. The conditions required for XSW to appear in the space between two polished parallel plane plates are formulated and a slit size interval conforming to these conditions is evaluated. A mechanism of a XSW intensity decrease in a planar waveguide is proposed. This mechanism explains a high efficiency of slitless collimator application for the transportation of narrow X-Ray beams. Some recommendations on the application of the planar X-Ray waveguide in X-Ray structural and spectral studies of surface are presented.
Theta-functions on T^2-bundles over T^2 with the Euler class zero
Dmitry V. Egorov
Mathematics , 2011, DOI: 10.1007/s11202-009-0072-x
Abstract: We construct an analogue of the classical theta-function on an Abelian variety for closed 4-dimensional symplectic manifolds which are T^2-bundles over T^2 with the zero Euler class. We use our theta-functions for a canonical symplectic embedding of these manifolds into complex projective spaces (an analogue of the Lefschetz theorem).
Mirror Kaehler potential on Calabi-Yau threefolds
Dmitry V. Egorov
Mathematics , 2011,
Abstract: The classical Kaehler potential is a real-valued function (KP) such that one can determine a Kaehler (symplectic) structure by differentiating KP. We define a mirror Kaehler potential on Calabi-Yau 3-folds, a real-valued function (MKP) such that one can determine a complex structure by differentiating MKP.
Theta functions on the Kodaira-Thurston manifold
Dmitry . V. Egorov
Mathematics , 2009, DOI: 10.1007/s11202-009-0029-0
Abstract: We define analogue of theta-functions on the Kodaira--Thurston manifold which is a compact 4-dimensional symplectic manifold and use them to construct canonical symplectic embedding of the Kodaira--Thurston manifold into the complex projective space (analogue of the Lefshetz theorem).
Symplectic analog of Calabi's conjecture for Calabi--Yau threefolds
Dmitry V. Egorov
Mathematics , 2012,
Abstract: In this paper we state an analog of Calabi's conjecture proved by Yau. The difference with the classical case is that we propose deformation of the complex structure, whereas the complex Monge--Amp\`{e}re equation describes deformation of the K\"{a}hler (symplectic) structure.
Riemannian Spin(7) holonomy manifold carries octonionic-Kahler structure
Dmitry V. Egorov
Mathematics , 2011,
Abstract: We prove that Riemannian $Spin(7)$ holonomy manifolds carry octonionic-K\"{a}hler structure.
The Correlation between the Activities of Digestive Enzymes in the Pancreas and Blood Serum in Chicken  [PDF]
V. G. Vertiprakhov, A. A. Grozina, V. I. Fisinin, I. A. Egorov
Open Journal of Animal Sciences (OJAS) , 2018, DOI: 10.4236/ojas.2018.83016
Abstract: It is presently an established fact that pancreatic enzymes (amylase, lipase, and trypsin) can enter the bloodstream as well as the intestine. These enzymes normally circulate within the bloodstream in definite concentration ranges. There is a lack of available information on the interrelationships between the enzymatic activities in pancreatic juice and blood serum in poultry. The study presented was aimed at the determination of possible correlation between the activities of the digestive enzymes in pancreatic juice or pancreatic tissue and in blood serum in chicken. The study was performed on Leghorn cockerels with chronically fistulated main pancreatic duct, and broiler chicks at different ages (14, 24, 28, and 35 days). Activities of all digestive enzymes in pancreatic juice in cockerels were found to grow in 1 hr after the feeding: amylase by 1.8 times, lipase 1.5 times, and proteases 1.3 times compared to basal level (after starving). Activity of trypsin in serum significantly increased by 67.4% in 1 hr after the feeding (P < 0.001) while activities of amylase and lipase remained at their respective preprandial levels. The activities of pancreatic enzymes in the pancreas and blood serum in broilers at different ages were positively correlated: r = 0.54 for amylase, r = 0.96 for lipase, and r = 0.99 for trypsin. The strong positive correlation between tryptic activities in the pancreas or pancreatic juice and in blood serum in chicken can be a starting point for further research on the functions of circulatory trypsin which can include the regulation of exocrine pancreatic activity and other vital functions.
Gas and dust in the BCD galaxy VII Zw 403 (UGC 6456)
O. V. Egorov,T. A. Lozinskaya
Physics , 2011, DOI: 10.1134/S1990341311030023
Abstract: Based on the results of the earlier spectroscopic observations with the 6-m BTA telescope of the SAO RAS we refine the metallicity estimates of the complexes of ionized gas in the VII Zw 403 galaxy. Infrared observations from the Spitzer Space Telescope are used to search for a possible correlation of the mass fraction distribution of the polycyclic aromatic hydrocarbons (PAH) with the distribution of ionized and neutral hydrogen, and with the metallicity of gas in the HII regions of the galaxy.
Current and field stimulated motion of domain wall in narrow permalloy stripe
L. S. Uspenskaya,S. V. Egorov
Physics , 2015,
Abstract: Of the new types of cryoelectronic devices under development, including phase shifters, giant magnetoresistance switches, diodes, transistors, and memory cells, some are based on hybrid superconductor-normal metal or superconductor-ferromagnet films. Control of these devices is realized by means of pulses of voltage, light, or magnetic field. Spin-polarized current may be used to switch low-temperature devices, as in spin-electronic devices. In the superconducting layer, the current is dissipation less, which would bring large reduction of energy consumption. We demonstrate that mag-netic domain walls in bilayer niobium-permalloy stripes are shifted by electrical current along the stripe even at low tem-perature, with the niobium in the superconducting state. The wall motion in response to current pulses is quite different from that induced by a magnetic field pulses only. The effect could be used to create a new type of sequentially switched serial devices because of very high value of the wall velocity, which excides by many orders of magnitude the velocity of the wall moved with magnetic field pulses.
Memory effects in permalloy-niobium hybrid structures
L. S. Uspenskaya,S. V. Egorov
Physics , 2011,
Abstract: The kineticts of magnetization reversal of stripe-shaped permalloy-niobium hybrid nanofilms is studied in 6-300 K temperature range by means of magneto-optics visualization technique. The niobium influence on magnetic domain walls type and on magnetic domain structure of permalloy via the interface quality and via the distortion of stray fields is found. The memory effect, which is the superconducting niobium memory about an initial magnetic domain structure of permalloy at cooling below T_c, is found. The memory is razed only by hybrid heating over T_c.
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