DETERMINATION OF THRESHOLD N-FACTORS OF THE LAMINAR–TURBULENT TRANSITION IN A SUBSONIC BOUNDARY LAYER ON A PROLATE SPHEROID

Journal of Applied Mechanics and Technical Physics - Results of a numerical study of the laminar-turbulent transition in the boundary layer of a prolate spheroid obtained with the use of the ANSYS...     

Effect of the Power-Frequency Electromagnetic Field on the Physicochemical Properties of Aluminum Micro- and Nanopowders

Technical Physics - The effect of power-frequency (50 Hz) electromagnetic field on variation in the physicochemical properties of aluminum powders with different dispersities is studied. It is...     

Satellite Transition of the Resonance Doublet of the Na Atom in a Mixture with CF4

JETP Letters - The excitation spectrum of the resonance luminescence of Na atoms in a mixture with CF4 exhibits a satellite transition corresponding to the simultaneous optical excitation of the...     

Relaxation Mode of Macroscopic Plastic Deformation in Metals

Russian Physics Journal - The relaxation of elastic energy during macroscopic plastic deformation in a rigorous formulation is determined by solutions of the system of nonlinear equations of...     

Mg2Sn Stannide under Pressure: First-Principles Evolutionary Search Results

Physics of the Solid State - The search of optimal structures of magnesium stannide Mg2Sn has been performed using the software suite implementing the evolution algorithm based on the density...     

Determination of the Yarkovsky Effect Parameter for Asteroids with Small Perihelion Distances

Russian Physics Journal - Results of determining the Yarkovsky effect parameter for all asteroids with small perihelion distances known by January, 2021 are presented. A comparison is performed...     

Effective suppression of beta oscillation in Parkinsonian state via a noisy direct delayed feedback control scheme

This work explores the function of the noisy direct delayed feedback(NDDF)control strategy in suppressing the pathological oscillations in the basal ganglia(BG)with Parkinson’s disease(PD).Deep brain stimulation(DBS)alleviates the PD state fantastically.However,due to its unclear mechanism and open-loop characteristic,it is challenging to further improve its effects with lower energy expenditure.The noise stimulus performs competitively in alleviating the PD state theoretically,but it cannot adapt to the neural condition timely and automatically due to its open-loop control scheme.The direct delayed feedback(DDF)control strategy is able to disturb excessive synchronous effectively.Therefore,the NDDF control strategy is proposed and researched based on a BG computational model,which can reflect the intrinsic properties of the BG neurons and their connections with thalamic neurons.Simulation results show that the NDDF control strategy with optimal parameters is effective in removing the pathological beta oscillations.By comparison,we find the NDDF control strategy performs more excellent than DDF in alleviating PD state.Additionally,we define the multiple-NDDF control strategy and find that the multiple-NDDF with appropriate parameters performs better than NDDF.The obtained results contribute to the cure for PD symptoms by optimizing the noise-induced improvement of the BG dysfunction.     

Uniqueness of the Solution of the Inverse Problem for a Model of the Dynamics of an Age-Structured Population

Mathematical Notes - For the McKendrick model of the dynamics of an age-structured population, we consider the inverse problem of reconstructing two coefficients of the model: in the equation and...     

加强型Bi-2212超导股线有限元拉伸性能分析

为探究加强型Bi-2212超导股线的力学性能以及不锈钢包带对超导股线力学性能的影响，运用Ansys软件建立加强型Bi-2212超导股线的三维模型，采用有限元分析方法，对其机械结构进行仿真，模拟高温高压热处理后轴向受拉形变量和应力应变分布情况。仿真结果显示，在同样施加100 N拉力的情况下，与超导原线（Bi-2212超导线）相比，密绕Ni₈₀Cr₂₀包带后的加强型Bi-2212超导股线轴向受拉形变程度减小，约10%;应力应变均降低，约30%。采用Ni₈₀Cr₂₀作为外包带制成的加强型Bi-2212超导股线力学性能显著，是未来超导线发展方向之一。     

Two-Photon Excitation Fluorescence Microscopy of Rat Elastin Fiber In Vivo

Russian Physics Journal - The paper presents the results of two-photon excitation fluorescence microscopy of rat elastin fiber in vivo. It is shown that in approximating the fluorescence...