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проф. каф. мат. ФФ Николай Алексеевич Тихонов — сын акад. Тихонова
Record 1 of 18
Tikhonov, NA. 2007. Oscillations of the concentration and size of ion exchanger grains during sorption of amino acids. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY 81 (8): 1292-1297.
Author Full Name(s): Tikhonov, N. A.
Abstract: Grain size and concentration may oscillate during the sorption of amino acids from solutions onion exchangers. This phenomenon was observed experimentally in several works. We present its theoretical explanation and report mathematical modeling results.
Record 2 of 18
Tikhonov, NA. 2007. Red giants in the blue compact galaxy IZw18. ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS 33 (3): 137-148.
Author Full Name(s): Tikhonov, N. A.
Abstract: Archival Hubble Space Telescope (FIST) data have been used for the photometry of stars in blue compact dwarf (BCD) galaxies of the lZw18 system. Applying the spatial selection of stairs, we have detected red giants, stars older than 1-2 Gyr, in the galaxies. These red giants have allowed the distance to lZw18 to he reliably determined for the First time: D = 13.9 +/- 1.2 Mpc. The presence of old stars in the galaxies of the lZw18 system refutes the hypothesis about the observed primary star formation in these galaxies.
Record 3 of 18
Tikhonov, NA. 2006. Stellar structure of irregular galaxies: Edge-on galaxies. ASTRONOMY REPORTS 50 (7): 517-525.
Author Full Name(s): Tikhonov, N. A.
Abstract: Stellar photometry obtained using the Hubble Space Telescope is used to study the distributions of the number densities of stars of various ages in 12 irregular and dwarf spiral galaxies viewed edge-on. Two subsystems can be distinguished in all the galaxies: a thin disk comprised of young stars and a thick disk containing a large fraction of old stars (primarily red giants) in the system. Variations of the stellar number density in the thin and thick disks in the Z direction perpendicular to the plane of the galaxy follow an exponential law. The size of the thin disk corresponds to the visible size of the galaxy at the mu = 25 mag/arcsec(2) isophote, while the thick disk is a factor of two to three larger. In addition to a thick disk, the massive irregular galaxy M82 also has a more extended stellar halo that is flattened at the galactic poles. The results of our previous study of 12 face-on galaxies are used together with the new results presented here to construct an empirical model for the stellar structure of irregular galaxies.
Record 4 of 18
Karataeva, GM; Tikhonov, NA; Galazutdinova, OA; Hagen-Thorn, VA. 2006. Stellar population of the central regions of NGC 5128. ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS 32 (4): 236-243.
Abstract: We present the results of stellar photometry in eight fields of NGC 5128 (Cen A a candidate polar-ring galaxy, obtained by reducing images from the Hubble Space Telescope archive. In all cases, the color-magnitude diagrams reached the red-giant region, and the distance to the galaxy was determined from the position of the tip of the red-giant branch (4.1 Mpc in agreement with previous estimates. Comparison of the diagrams with theoretical isochrones indicates that the red supergiants in the dark lane region are metal-rich, which is atypical of the polar rings. Our results are consistent with the assumption made by several authors that the absorption of a less massive spiral galaxy by a more massive one is observed in NGC 5128.
Record 5 of 18
Tikhonov, NA. 2006. Stellar structure of the dwarf irregular galaxy DDO 216. ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS 32 (3): 149-156.
Abstract: Observations with the 6-m BTA telescope and archival Hubble Space Telescope data were used for the photometry of stars in the dwarf edge-on irregular galaxy DDO 216 (Peg DIG). We determined the change in the number density of stars of various ages along the major and minor axes of the galaxy. We found that the young stars of the galaxy concentrate toward the center, while its old stars, red giants, form an extended thick disk 5 kpc in diameter mid 2 kpc in thickness around the galaxy.
Record 6 of 18
Gorlenko, LE; Emel'yanova, GI; Tikhonov, NA; Fionov, AV; Rozhkova, NN; Yankovska, A; Lunin, VV. 2005. The influence of low-temperature gas-phase oxidation of schungites on their structure and catalytic activity. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY 79 (8): 1232-1237.
Abstract: The influence of ozone on the structure and free-radical properties of the surface of schungite carbon was studied by the EPR, X-ray, and adsorption methods. Ozonization was found to increase the number of valence-saturated oxygen-containing, groups on the surface of carbon. As a consequence, the number of paramagnetic centers decreased. According to the X-ray data, demineralized schungites contain alpha-quartz and other silica polymorphs in addition to the microcrystalline graphite phase. Ozonization did not cause noticeable changes in the structure of schungite carbon but increased its specific surface area and adsorption capacity. The number of micropores increased severalfold. The contribution of mesopores to the total volume of pores was not large even after ozonization. A high catalytic activity of schungite (30% C) in the decomposition of ozone was observed.
Record 7 of 18
Tikhonov, NA. 2005. Oscillations in the conductivity of an ionite membrane during the diffusion and electromigration of ions under stationary external conditions. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY 79 (8): 1341-1346.
Abstract: Mathematical modeling demonstrated that, under stationary external conditions, the electromigration and diffusion of ions through an ionite membrane can be accompanied by low-frequency oscillations in the conductivity of the membrane, in agreement with the results of a number of experimental studies. It was found that periodic oscillations are generated when ions with substantially different diffusion coefficients are involved.
Record 8 of 18
Tikhonov, NA. 2005. The stellar structure of irregular galaxies. Face-on galaxies. ASTRONOMY REPORTS 49 (7): 501-509.
Abstract: Stellar photometry of nearby irregular galaxies of the Local Group is used to identify and study the young and old stellar populations of these galaxies. An analysis of the spatial distributions of stars of different ages in face-on galaxies shows that the young stellar populations in irregular galaxies are concentrated toward the center, and form local in homogeneities in star-forming regions, while the old stellar populations-red giants-form extended structures around the irregular galaxies. The sizes of these structures exceed the visible sizes of the galaxies at the 25(m)/arcsec(2) isophote by a factor of two to three. The surface density of the red giants decreases exponentially from the center toward the edge, similar to the disk components in spiral galaxies. (c) 2005 Pleiades Publishing, Inc.
Record 9 of 18
Tikhonov, NA; Galazutdinova, OA. 2005. Stellar disks and halos of edge-on spiral galaxies: NGC 891, NGC 4144, and NGC 4244. ASTROPHYSICS 48 (2): 221-236.
Abstract: Stellar photometry of images from the ACS and WFPC2 cameras on the Hubble Space Telescope (HST) is used to study the star composition and spatial distribution of stars in three edge-on visible spiral galaxies: NGC 891, NGC 4144, and NGC 4244. Measurements of the surface number density of old stars revealed two stellar subsystems in these galaxies: a thick disk and a halo. The boundaries of these subsystems, which consist mainly of red giants, are determined from the change in the gradient of the number density of the stars. The halos are flattened at the poles of the galaxies and extend to distances of 8-25 kpc from the planes of the galaxies. The present results on the number density distribution of stars with different ages perpendicular to the planes of these galaxies make it possible to improve our model for the stellar structure of spiral galaxies. The distances to these galaxies are calculated using a determination of the tip of the red giant branches (the TRGB method): D = 9.82 Mpc (NGC 891 D = 7.24 Mpc (NGC 4144 and D = 4.29 Mpc (NGC 4244).
Record 10 of 18
Tikhonov, NA; Galazutdinova, OA; Drozdovsky, IO. 2005. Thick disks and halos of spiral galaxies M 81, NGC 55 and NGC 300. ASTRONOMY & ASTROPHYSICS 431 (1): 127-142.
Abstract: By using images from the HST/WFPC2/ACS archive, we have analyzed the spatial distribution of the AGB and RGB stars along the galactocentric radius of nearby spiral galaxies M 81, NGC 300 and NGC 55. Examining color-magnitude diagrams and stellar luminosity functions, we gauge the stellar contents of the surroundings of the three galaxies. The red giant population (RGB) identified at large galactocentric radii yields a distance of 3.85 +/- 0.08 Mpc for M 81, 2.12 +/- 0.10 Mpc for NGC 55, and 2.00 +/- 0.13 Mpc for NGC 300, and a mean stellar metallicity of -0.65, -1.25, and -0.87 respectively. We find that there are two number density gradients of RGB stars along the radius, which correspond to the thick disk and halo components of the galaxies. We confirm the presence of a metallicity gradient of evolved stars in these galaxies, based on the systematic changes of the color distribution of red giant stars. These results imply that the thick disk might be a general feature of spiral galaxies, and endorse a further investigation of the outer stellar edges of nearby spirals, which is critical in constraining the origin and evolution of galaxies.
Record 11 of 18
Kovarskii, AL; Revina, AA; Dobryakov, SN; Baider, LM; Tikhonov, NA. 2004. ESR study of bimetallic Cu/Ag nanoparticles in micellar solutions and on a solid surface. COLLOID JOURNAL 66 (6): 696-699.
Abstract: The ESR spectra of copper ions of bimetallic Cu2+/Ag+ nanoparticles obtained by the radiolysis of micellar systems in hydrocarbon medium (isooctane) and adsorbed onto a solid surface (silica gel) were analyzed. It was shown that the assembly of individual copper complexes into nanoparticles leads to variations in the patterns and parameters of ESR spectra. It was also shown that the spectra depend on the nature of the surrounding medium (a liquid or a solid surface the ion charge, and the presence of isotopes.
Record 12 of 18
Karataeva, GA; Tikhonov, NA; Galazutdinova, OA; Hagen-Thorn, VA; Yakovleva, VA. 2004. The stellar content of the ring in NGC 660. ASTRONOMY & ASTROPHYSICS 421 (3): 833-837.
Abstract: We present the results of stellar photometry of the polar-ring galaxy NGC 660 using the Hubble Space Telescope's archival data obtained with the Wide Field Planetary Camera 2. The final list of the resolved stars contains 550 objects, a considerable part of which are blue and red supergiants belonging to the polar ring. The analysis of the Colour-Magnitude Diagram for polar ring stars shows that it is best represented by the isochrones with metallicity Z=0.008. The process of star formation in the polar ring was continuous and the age of the youngest detected stars is about 7 Myr.
Record 13 of 18
Roldugin, VI; Dolotov, SV; Tikhonov, NA. 2004. EPR spectra of fractal aggregates of metal nanoparticles. DOKLADY PHYSICAL CHEMISTRY 396: 127-129, Part 2.
Record 14 of 18
Emel'yanova, GI; Gorlenko, LE; Tikhonov, NA; Rozhkova, NN; Rozhkova, VS; Lunin, VV. 2004. Oxidative modification of schungites. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY 78 (7): 1070-1076.
Abstract: The paper presents data on the action of ozone and oxygen and argon glow discharge plasmas on the properties of schungites from Karelia, which are the least studied natural carbonaceous materials. The properties of various schungites before and after their oxidative modification were studied. The properties of schungites were characterized by potentiometric titration of acid groups on the surface, thermal desorption of nitrogen, and IR spectroscopy. The kinetics of ozonization exhibited chaotic oscillations of the rate of formation of CO2 from carbonyls formed on the surface of carbon undergoing oxidation, which is unusual for the oxidation of carbons. The effective constants and activation energies of the interaction of ozone with schungite carbon were determined. Ozonization was found to increase the surface area. Simultaneously, the content of oxygen-containing functional groups on the surface grew and their composition changed during oxidation. Glow, discharge plasmas had the opposite effect; according to the IR spectra, the intensity of the bands of these groups dropped sharply, and the specific surface area decreased.
Record 15 of 18
Muraviev, D; Khamizov, RK; Tikhonov, NA; Morales, JG. 2004. Clean ("Green") ion-exchange technologies. 4. High-Ca-selectivity ion-exchange material for self-sustaining decalcification of mineralized waters process. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 43 (8): 1868-1874.
Abstract: This paper (the fourth in a series) reports the results of a theoretical and experimental study of the decalcification of seawater on different ion-exchange sorbents by simultaneous use of electroselectivity reversal and ion-exchange isothermal supersaturation MUSS) effects. A detailed evaluation of the influence of the sorbent properties on the efficiency of the IXISS-based self-sustaining seawater decalcification process was carried out through a series of computer experiments using a mathematical model of the dynamics of ion exchange. It was found that the best sorbent to be used in the process is a modified A-type zeolite. The modification of the zeolite includes sequential treatment of the initial ion exchanger with dilute magnesium-containing solution (or seawater) and concentrated sodium salt solution. The first treatment was carried out at elevated temperature [15-20 degreesC higher than the temperature at which the modified zeolite (MZ) is expected to be used, T-ex],and the second was performed at T-ex. The complete regeneration of the MZ after the calcium sorption cycle was carried out with the calcium-free brine produced by the seawater desalination unit. The process is continuous and operates in the closed-cycle mode.
Record 16 of 18
Tikhonov, NA. 2004. Concentration oscillations during the diffusion of ions through an ion-exchange membrane. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY 78 (3): 436-442.
Abstract: The generation of low-frequency oscillations of the concentration and flux of ions diffusing through an ion-exchange membrane under steady external conditions is investigated. A mathematical model of this well-known phenomenon is proposed.
Record 17 of 18
Karataeva, GM; Drozdovsky, IO; Hagen-Thorn, VA; Yakovleva, VA; Tikhonov, NA; Galazutdinova, OA. 2004. The stellar content of the polar rings in the galaxies NGC 2685 and NGC 4650A. ASTRONOMICAL JOURNAL 127 (2): 789-797.
Abstract: We present the results of stellar photometry of polar ring galaxies NGC 2685 and NGC 4650A, using the archival data obtained with the Hubble Space Telescope's Wide Field Planetary Camera 2. Polar rings of these galaxies were resolved into similar to 800 and similar to 430 stellar objects in the B, V, and I-C bands, a considerable part of which are blue supergiants located in the young stellar complexes. The stellar features in the CM diagrams are best represented by isochrones with metallicity Z = 0.008. The process of star formation in the polar rings of both galaxies was continuous, and the age of the youngest detected stars is about 9 Myr for NGC 2685 and 6.5 Myr for NGC 4650A.
Record 18 of 18
Muraviev, D; Khamizov, RK; Tikhonov, NA. 2003. Peculiarities of the dynamics of ion exchange in supersaturated solutions and colloid systems. LANGMUIR 19 (26): 10852-10856.
Abstract: This paper reports the results obtained by experimental and theoretical study of the dynamics of ion exchange accompanied by the ion-exchange isothermal supersaturation (IXISS) effect. This effect is observed for a number of ion-exchange systems where the frontal or the reverse frontal separation is accompanied by the formation of extremely stable supersaturated solutions of low solubility substances in the interstitial space of ion-exchange columns. After leaving the column, a supersaturated solution crystallizes spontaneously, which allows for designing a practically ideal ion-exchange process where a crystalline product is obtained directly after the ion-exchange treatment cycle. The paper comprises results on the experimental investigation of IXISS of magnesium carbonate on carboxylic resins, which is observed in desorption of Mg2+ from the resin in the Mg form with Na2CO3 solutions or with solutions of Na2CO3- NaHCO3 mixtures. The physical and mathematical models of the kinetics and the dynamics of the ion-exchange processes proceeding in a colloid system comprising a supersaturated solution and an ion exchanger, which surface is partially blocked by adsorbed precrystalline aggregated (micelles are proposed, and their validity is experimentally confirmed.
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