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Search Results: 1 - 10 of 586908 matches for " N. A. Danilov "
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Optoelectronic correlation processors with photorefractive crystals for the storage elements
Lipinskii A. Y.,Rudiakova A. N.,Danilov V. V.
Tekhnologiya i Konstruirovanie v Elektronnoi Apparature , 2011,
Abstract: The paper presents review of optical and acousto-optic correlation processors that contain photorefractive crystals. Optical correlators are the efficient devices for the image recognition due to the parallel way high operation rate processing of significant data amount. The shift-invariant holographic joint-transform correlators, dynamic holographic correlator, acousto-optic correlation processors with memory were considered.
Beam Physics of Integrable Optics Test Accelerator at Fermilab
S. Nagaitsev,A. Valishev,V. V. Danilov,D. N. Shatilov
Physics , 2013,
Abstract: Fermilab's Integrable Optics Test Accelerator is an electron storage ring designed for testing advanced accelerator physics concepts, including implementation of nonlinear integrable beam optics and experiments on optical stochastic cooling. The machine is currently under construction at the Advanced Superconducting Test Accelerator facility. In this report we present the goals and the current status of the project, and describe the details of machine design. In particular, we concentrate on numerical simulations setting the requirements on the design and supporting the choice of machine parameters.
Design and Simulation of IOTA - a Novel Concept of Integrable Optics Test Accelerator
S. Nagaitsev,A. Valishev,V. V. Danilov,D. N. Shatilov
Physics , 2013,
Abstract: The use of nonlinear lattices with large betatron tune spreads can increase instability and space charge thresholds due to improved Landau damping. Unfortunately, the majority of nonlinear accelerator lattices turn out to be nonintegrable, producing chaotic motion and a complex network of stable and unstable resonances. Recent advances in finding the integrable nonlinear accelerator lattices have led to a proposal to construct at Fermilab a test accelerator with strong nonlinear focusing which avoids resonances and chaotic particle motion. This presentation will outline the main challenges, theoretical design solutions and construction status of the Integrable Optics Test Accelerator underway at Fermilab.
Fundamental Basis of Medical Aid Organization and Management in the Region
Denisova Т.Р.,Danilov A.N.,Malinova L.I.,Shuldyakov V.A.
Saratov Journal of Medical Scientific Research , 2012,
Abstract: The article presents computations on informational and analytical basis of public health database, that help to perform accurate monitoring, and detection of public health system state, as well as prognosis of further dynamics of public health system parameters for scientifically proved health care organization and decisions in management.
Ageing and longevity in Volga region population
Danilov A.N.,Shuldyakov V.A.,Malinova L.I.,Ahmadullina L.G.
Saratov Journal of Medical Scientific Research , 2012,
Abstract: The results of complete clinical and demographic investigation of Volga Region population of long-livers have been presented. Anthropologic, social, clinical, laboratory and instrumental markers of longevity have been determined.
Circular photon drag effect in bulk tellurium
V. A. Shalygin,M. D. Moldavskaya,S. N. Danilov,I. I. Farbshtein,L. E. Golub
Physics , 2015,
Abstract: The circular photon drag effect is observed in a bulk semiconductor. The photocurrent caused by a transfer of both translational and angular momenta of light to charge carriers is detected in tellurium in the mid-infrared frequency range. Dependencies of the photocurrent on the light polarization and on the incidence angle agree with the symmetry analysis of the circular photon drag effect. Microscopic models of the effect are developed for both intra- and inter-subband optical absorption in the valence band of tellurium. The shift contribution to the circular photon drag current is calculated. An observed decrease of the circular photon drag current with increase of the photon energy is explained by the theory for inter-subband optical transitions. Theoretical estimates of the circular photon drag current agree with the experimental data.
Thermoelectric and galvanomagnetic properties of bismuth chalcogenide nanostructured hetero-epitaxial films
L. N. Lukyanova,Yu. A. Boikov,V A Danilov,O A Usov,M P Volkov,V. A. Kutasov
Physics , 2014, DOI: 10.1088/0268-1242/30/1/015011
Abstract: Hot wall technique was used to grow block single crystal films of Bi_2Te_3 and solid solutions of Bi_(0.5)Sb_(1.5)Te_3 on mica (muscovite) substrates. X-ray diffraction studies demonstrated that the crystalline c-axis in the films was normal to the substrate plane. Seebeck coefficient, electrical conductivity and magnetoresistivity tensor components were measured at various orientations of magnetic and electric fields in the temperature interval 77-300 K and magnetic field up to 14 T. Scattering mechanism of charge carriers in the films were studied using temperature dependences of the degeneracy parameter and the Seebeck coefficient in terms of a many-valley model of energy spectrum. Obtained results have shown that the effective scattering parameter is considerably differed from the value specific for an acoustic scattering of charge carriers in the weakly degenerate films due to an additional scattering of charge carriers on interface and interctystallite boundaries. These features of charge carrier scattering are supposed to affect electronic transport in the films and enhance figure of merit.
Quantum oscillations of magnetoresistance of the submicrometer thick bismuth telluride-based films
L. N. Lukyanova,Yu. A. Boikov,V. A. Danilov,O. A. Usov,M. P. Volkov,V. A. Kutasov
Physics , 2014,
Abstract: Hetero-epitaxial films based on bismuth telluride with excess of Te were grown by hat wall technique at the surface of the mica (muscovite). Galvanomagnetic properties of the thin films were measured, and quantum oscillations of the magnetoresistance were found at the temperatures below 10 K in the magnetic field from 6 to 14 T. From analysis of magnetoresistance oscillations the main surface state parameters of the films were determined. Expementally obtained Landau level index shift and its temperature dependence are consistent with Berry phase specific for topological Dirac surface states. The estimated parameters of electronic topological surface states of the bismuth telluride-based films are of special interest because of possible usage of them in micro generators and micro coolers, and also for other device applications.
Cyclotron resonance photoconductivity of a two-dimensional electron gas in HgTe quantum wells
Ze-Don Kvon,Sergey N. Danilov,Nikolay N. Mikhailov,Sergey A. Dvoretsky,Wilhelm Prettl,Sergey D. Ganichev
Physics , 2007, DOI: 10.1016/j.physe.2007.08.115
Abstract: Far-infrared cyclotron resonance photoconductivity (CRP) is investigated in HgTe quantum wells (QWs) of various widths grown on (013) oriented GaAs substrates. It is shown that CRP is caused by the heating of two-dimensional electron gas (2DEG). From the resonance magnetic field strength effective masses and their dependence on the carrier concentration is obtained. We found that the effective mass in each sample slightly increases from the value (0.0260 \pm 0.0005)m_0 at N_s = 2.2x10^11 cm^(-2) to (0.0335 \pm 0.0005)m_0 at N_s = 9.6x10^11 cm^(-2). Compared to determination of effective masses by the temperature dependence of magnitudes of the Shubnikov-de Haas (SdH) oscillations used so far in this material our measurements demonstrate that the CRP provides a more accurate (about few percents) tool. Combining optical methods with transport measurements we found that the transport time substantially exceeds the cyclotron resonance lifetime as well as the quantum lifetime which is the shortest.
Anomalous Hall effect in two-phase semiconductor structures: the crucial role of ferromagnetic inclusions
A. V. Kudrin,A. V. Shvetsov,Yu. A. Danilov,D. A. Pavlov,A. I. Bobrov,N. V. Malekhonova,A. A. Timopheev,N. A. Sobolev
Physics , 2013, DOI: 10.1103/PhysRevB.90.024415
Abstract: The Hall effect in InMnAs layers with MnAs inclusions of 20-50 nm in size is studied both theoretically and experimentally. We find that the anomalous Hall effect can be explained by the Lorentz force caused by the magnetic field of ferromagnetic inclusions and by an inhomogeneous distribution of the current density in the layer. The hysteretic dependence of the average magnetization of ferromagnetic inclusions on an external magnetic field results in a hysteretic dependence of RH(Hext). Thus we show the possibility of a hysteretic RH(Hext) dependence (i.e. observation of the anomalous Hall effect) in thin conductive layers with ferromagnetic inclusions in the absence of carriers spin polarization.
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