Search results for: A. Zhukov

Items from 1 to 20 out of 397 results

article

Weak Dispersion of Exciton Landé Factor with Band Gap Energy in Lead Halide Perovskites: Approximate Compensation of the Electron and Hole Dependences

Natalia E. Kopteva, Dmitri R. Yakovlev, Erik Kirstein, Evgeny A. Zhukov, more

Small > 20 > 16 > n/a - n/a

The optical properties of lead halide perovskite semiconductors in vicinity of the bandgap are controlled by excitons, so that investigation of their fundamental properties is of critical importance. The exciton Landé or g‐factor g_X is the key parameter, determining the exciton Zeeman spin splitting in magnetic fields. The exciton, electron, and hole carrier g‐factors provide information on the band...

article

Lead‐Dominated Hyperfine Interaction Impacting the Carrier Spin Dynamics in Halide Perovskites

Erik Kirstein, Dmitri R. Yakovlev, Mikhail M. Glazov, Eiko Evers, more

Advanced Materials > 34 > 1 > n/a - n/a

The outstanding optical quality of lead halide perovskites inspires studies of their potential for the optical control of carrier spins as pursued in other materials. Entering largely uncharted territory, time‐resolved pump–probe Kerr rotation is used to explore the coherent spin dynamics of electrons and holes in bulk formamidinium caesium lead iodine bromide (FA_0.9Cs_0.1PbI_2.8Br_0.2) and to determine...

article

The Influence of Agricultural Land Use on the Dynamics of Biological Cycling and Soil Properties in the Course of Postagrogenic Succession (Kostroma Oblast)

V. M. Telesnina, M. A. Zhukov

Eurasian Soil Science > 2019 > 52 > 9 > 1122-1136

The postagrogenic dynamics of biological cycling and soil properties have been studied in three soil successions characterizing postagrogenic overgrowing of: (i) former cropland on a loamy sandy soil underlain by loam (Retic Albic Podzol (Anoarenic, Endoloamic, Ochric)), (ii) well-fertilized garden loamy sandy soil underlain by loam (Plaggic Podzol (Anoarenic, Endoloamic, Humic)), and (iii) loamy...

article

Phase Composition and Hardness of AlMgB₁₄-Based Polycrystalline Materials

I. A. Zhukov, P. Yu. Nikitin, M. V. Grigoriev, A. B. Vorozhtsov

Russian Physics Journal > 2019 > 62 > 5 > 882-885

The paper presents research results of the phase composition, crystal structure and hardness of AlMgB₁₄-based ceramic materials obtained by the hot pressing method using powder mixtures of various grain-size composition. It is found that the largest amount of AlMgB₁₄ phase of ~97 wt.% is achieved for the Al–Mg–B powder mixture after 4-hour activation in a planetary mill. The highest value of the hardness...

article

Erratum to: Asymptotic Analysis of the Plane Strain State Generated by a Finite Longitudinal Shear Crack

B. A. Zhukov

Mechanics of Solids > 2019 > 54 > 1 > 130-130

There was a mistake in the affiliations. The right second affiliation is “Volgograd State Socio-Pedagogical University, pr. im. V.I. Lenina 27, Volgograd, 400066 Russia.”

article

Laser-Induced Boiling of Biological Fluids

V. M. Chudnovskii, A. Yu. Maior, V. I. Yusupov, S. A. Zhukov

High Temperature > 2019 > 57 > 4 > 531-538

Laser-induced boiling and the associated foaming of biological fluids (aqueous solutions of surfactants, proteins, fluids containing dispersed phase) on laser heaters that convert near-IR laser radiation (0.97 μm, 1.47 μm) into heat are considered. The objects of study were model fluids and biological fluids, sera, as well as recorded ultrasound images of boiling human endocystosis fluid and blood...

article

Asymptotic Analysis of the Plane Strain State Generated by a Finite Longitudinal Shear Crack

B. A. Zhukov

Mechanics of Solids > 2018 > 53 > 6 > 698-706

In the linear theory of elasticity, an arbitrary crack is represented as a combination of three: longitudinal shear cracks, transverse shear cracks, and normal tear cracks that do not interact with each other. In the nonlinear theory, for some types of strain energy potentials, a finite longitudinal shear crack necessarily generates a strain in the transverse plane. This article proposes an asymptotic...

article

Kinematics of Metallurgical Cutters with Parallel Blades

I. V. Bychkov, L. T. Dvornikov, I. A. Zhukov

Steel in Translation > 2019 > 49 > 4 > 238-244

—In the operation of cutters with parallel blades, three periods may be identified: pressing of blades into the metal; cutting; and cleavage (separation). The greatest force is required around the onset of cutting. Since one of the blades is immobile, the other must pass through the whole thickness of the metal in the course of cutting. For example, if the metal thickness is 20 mm, the upper blade...

article

Interaction between “Dry” Adhesives and the Surface of Materials Used for Spacecraft Engineering

A. A. Zhukov, I. P. Smirnov, I. G. Goryacheva, M. N. Savvateev, more

Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques > 2019 > 13 > 3 > 533-537

A “dry” adhesive, polyimide, with increased adhesion to materials used in spacecraft engineering is synthesized and studied. Its adhesion properties are estimated using the method of force–distance curves on the basis of scanning-probe-microscope functionality. A technique is developed for the deposition of polyimide onto the cantilever probe of a scanning probe microscope with subsequent measurement...

article

Improvement and Extension of the Capabilities of a Manipulator Based on the Probe of an Atomic-Force Microscope Operating in the Hybrid Mode

A. A. Zhukov

Instruments and Experimental Techniques > 2019 > 62 > 3 > 416-420

— A system for detecting the clamping point of a manipulator tip based on the probe of an atomic-force microscope operating in the hybrid mode was upgraded. The upgrading of the detection system made it possible not only to obtain topographic images of surfaces in this mode with vertical noises smaller than 10 nm, but also to use this manipulator to move microdroplets over the surface of a substrate...

article

Mobile Space Microrobot: Concept and Application Prospects

N. N. Bolotnik, V. G. Gradetskii, A. A. Zhukov, D. V. Kozlov, more

Cosmic Research > 2019 > 57 > 2 > 115-120

— This paper presents a brief overview of achievements in the field of microrobotics. The tasks that can be performed by mobile microrobots in space and the corresponding requirements for design and performance characteristics of such microrobots are formulated. The concept of a mobile space microrobot with thermomechanical silicon-polyimide actuators is proposed. The basic and technological feasibility...

article

Modeling of a High-Frequency Microelectromechanical X-Band Switch for Space Applications

E. A. Savin, G. K. Alagashev, P. I. Didyk, A. A. Zhukov, more

Journal of Communications Technology and Electronics > 2019 > 64 > 1 > 52-58

The results of modeling of microwave and mechanical characteristics of an X-band switch based on the technology of high-frequency microelectromechanical structures are presented. A method for design of a device operating directly in the external environment and a device whose moving components are placed in a dielectric case. Characteristics of the optimized switches are determined. Estimated mechanical...

article

Improvement of Down-the-Hole Air Hammer Efficiency by Optimizing Shapes of Colliding Parts

I. A. Zhukov, B. N. Smolyanitsky, V. V. Timonin

Journal of Mining Science > 2018 > 54 > 2 > 212-217

Design development of down-the-hole (DTH) air hammers is discussed with the aim of increasing efficiency of rock drilling. The problem is solved by making hammering piston with curvilinear frees surfaces which are in no contact with the hammer body. This ensures generation of rock-breaking impact at the minimum energy input. New designs of hammering pistons are developed for DTH air hammer models...

article

Acceleration of Transition to Stationary Mode for Solutions to a System of Viscous Gas Dynamics

K. A. Zhukov, A. A. Kornev, M. A. Lozhnikov, A. V. Popov

Moscow University Mathematics Bulletin > 2019 > 74 > 2 > 55-61

Explicit formulas for the initial data stabilization algorithm for the stationary solution are obtained by zero approximation method for the semi-implicit difference scheme approximating a system of equations for the dynamics of a one-dimensional viscous barotropic gas. The spectrum of the corresponding linearized system on the stationary solution is studied and theoretical convergence estimates are...

article

The Influence of the Structure of a Magnesium–Aluminum Nitride Metal-Matrix Composite on the Resistance to Deformation under Quasi-Static and Dynamic Loading

A. P. Khrustalyov, G. V. Garkushin, I. A. Zhukov, S. V. Razorenov

Technical Physics Letters > 2018 > 44 > 10 > 912-915

The microstructure of an ML5 commercial magnesium alloy reinforced by aluminum nitride (AlN) nanoparticles with an average size of 80 nm at an amount of 0.5 wt % has been studied. Comparative data on strength and plasticity of the initial ML15 alloy and AlN-reinforced metal-matrix composite were obtained using Instron 3369 universal testing machine. The influence of material microstructure on the...

article

Quantum communication protocols as a benchmark for programmable quantum computers

A. A. Zhukov, E. O. Kiktenko, A. A. Elistratov, W. V. Pogosov, more

Quantum Information Processing > 2019 > 18 > 1 > 1-23

We point out that realization of quantum communication protocols in programmable quantum computers provides a deep benchmark for capabilities of real quantum hardware. Particularly, it is prospective to focus on measurements of entropy-based characteristics of the performance and to explore whether a “quantum regime” is preserved. We perform proof-of-principle implementations of superdense coding...

article

Synthesis of AlMgB₁₄: Influence of Mechanical Activation of Al–Mg–B Powder Mixture on Phase Composition of Sintered Materials

I. A. Zhukov, M. Kh. Ziatdinov, Ya. A. Dubkova, P. Yu. Nikitin

Russian Physics Journal > 2018 > 61 > 8 > 1466-1471

An investigation of the size distribution and phase composition as well an analysis of the Al–Mg–B powder system are performed as a function of the time of mechanical activation in a planetary mill and heat treatment regimes. It is found out that the largest content of the AlMgB₁₄ phase is observed in the materials manufactured from a powder mixture subjected to a 4-hour mechanical treatment and sintered...

article

The Influence of Particles Introduced Into the Melt on Grain Refinement in the Final Structure of Aluminum Alloys

O. B. Kudryashova, I. A. Zhukov, A. I. Potekaev, A. B. Vorozhtsov, more

Russian Physics Journal > 2018 > 61 > 8 > 1457-1465

The results of an experimental investigation performed in this study allow supposing that a change in the aggregate state (crystallization) of a substance on the surface of the introduced small-sized (nano- or submicron) particles significantly affects the grain size in the final states of the alloys and composites. This is due to the fact that the melt – particle system is found in a low-stability...

article

Analog–Digital Quantum Simulation of the Dicke Model with Superconducting Circuits

S. V. Remizov, A. A. Zhukov, W. V. Pogosov, Yu. E. Lozovik

JETP Letters > 2018 > 108 > 11 > 748-753

We propose a concept of mixed analog–digital quantum simulation of the Dicke model with ensembles of superconducting qubits coupled to the single-mode microwave resonators. Using both single-qubit and twoqubit quantum logic gates, it should be possible to engineer different initial conditions for the ensemble of qubits. Since qubits can interact through the photon field of a common quantum resonator,...

article

Effects of Oxytocin and Thyroliberin on Anxiety in Male White Mice in Social Stress

E. P. Vinogradova, A. V. Kargin, N. A. Ogienko, D. A. Zhukov

Neuroscience and Behavioral Physiology > 2018 > 48 > 8 > 1019-1023

The effects of intranasal administration of oxytocin and thyroliberin solutions on changes in behavior in rats after moderate social stress were studied. Investigations were carried out on male Wistar rats (n = 100). Animals of experimental group 1 received intranasal oxytocin at a dose of 0.25 IU in 20 μl bilaterally and those of experimental group 2 received thyroliberin at a dose of 10 10 mmol...

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INFONA - science communication portal

Search results for: A. Zhukov

Weak Dispersion of Exciton Landé Factor with Band Gap Energy in Lead Halide Perovskites: Approximate Compensation of the Electron and Hole Dependences

Lead‐Dominated Hyperfine Interaction Impacting the Carrier Spin Dynamics in Halide Perovskites

The Influence of Agricultural Land Use on the Dynamics of Biological Cycling and Soil Properties in the Course of Postagrogenic Succession (Kostroma Oblast)

Phase Composition and Hardness of AlMgB₁₄-Based Polycrystalline Materials

Erratum to: Asymptotic Analysis of the Plane Strain State Generated by a Finite Longitudinal Shear Crack

Laser-Induced Boiling of Biological Fluids

Asymptotic Analysis of the Plane Strain State Generated by a Finite Longitudinal Shear Crack

Kinematics of Metallurgical Cutters with Parallel Blades

Interaction between “Dry” Adhesives and the Surface of Materials Used for Spacecraft Engineering

Improvement and Extension of the Capabilities of a Manipulator Based on the Probe of an Atomic-Force Microscope Operating in the Hybrid Mode

Mobile Space Microrobot: Concept and Application Prospects

Modeling of a High-Frequency Microelectromechanical X-Band Switch for Space Applications

Improvement of Down-the-Hole Air Hammer Efficiency by Optimizing Shapes of Colliding Parts

Acceleration of Transition to Stationary Mode for Solutions to a System of Viscous Gas Dynamics

The Influence of the Structure of a Magnesium–Aluminum Nitride Metal-Matrix Composite on the Resistance to Deformation under Quasi-Static and Dynamic Loading

Quantum communication protocols as a benchmark for programmable quantum computers

Synthesis of AlMgB₁₄: Influence of Mechanical Activation of Al–Mg–B Powder Mixture on Phase Composition of Sintered Materials

The Influence of Particles Introduced Into the Melt on Grain Refinement in the Final Structure of Aluminum Alloys

Analog–Digital Quantum Simulation of the Dicke Model with Superconducting Circuits

Effects of Oxytocin and Thyroliberin on Anxiety in Male White Mice in Social Stress

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