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Mainournal ArchiveYear 2026 / № 3

Issue: #3 (126)

DOI 10.18698/1812-3368-2026-3

Mathematics and Mechanics

Analysis of Least Squares Method Efficiency with L-BFGS-B Optimization for Bilinear Autoregression Parameter Estimation Under Various Noise Distributions
Authors: Goryainov V.B., Masyagin M.M., Semernya V.M.  

Category: Mathematics and Mechanics | Chapter: Mathematical Simulation, Numerical Methods and Software Packages

  
Keywords: bilinear autoregression, robust loss functions, L-BFGS-B optimization, mean squareerror, normal distribution, Laplace distribution, Student’s t-distribution, uniform distribution
Numerical Simulation of Laser Lap Welding--Brazing of Titanium and Aluminum Plates
Authors: Shmagunov O.A., Shapeev V.P.  

Category: Mathematics and Mechanics | Chapter: Mathematical Simulation, Numerical Methods and Software Packages

  
Keywords: numerical simulation, heat transfer, dissimilar metals, laser welding, laser brazing, intermetallics

Physics

Two-Dimensional Janus Alloys for Spintronics on the Example of Fe2I3Br3
Authors: Medintseva T.V., Kartsev A.I., Tarasov Yu.I.  

Category: Physics | Chapter: Condensed Matter Physics

  
Keywords: electron theory of solids, 2D magnets, density functional theory, two-dimensional transition metal dichalcogenides, Janus alloys
Investigation of Non-Isothermal Flow in a U-Shaped Tube in the Presence of Natural Convection
Authors: Sidorov A.V., Grabov V.M., Zaitsev A.A., Kuznetsov D.V., Tinkov N.I.  

Category: Physics | Chapter: Thermal Physics and Theoretical Heat Engineering

  
Keywords: natural convection, finite element method, nonisothermal flow, thermoelectrokinetic effect, Navier --- Stokes equation
Strength Properties Research of Heat-Protective Coating Produced by Extrusion
Authors: Ushakova E.S., Tuponogov V.G., Khotinov V.A.  

Category: Physics | Chapter: Condensed Matter Physics

  
Keywords: heat-protective coating, combustion chamber, butadiene-nitrile rubber, extrusion, tensile strength, time dependence of tensile strength, frost resistance

Chemistry

Physicochemical Properties and Antibacterial Activity of Zinc-Modified Hydroxyapatite
Authors: Gigilev A.S., Korotchenko N.M.  

Category: Chemistry | Chapter: Inorganic Chemistry

  
Keywords: calcium phosphates, bioceramics, zinc-modified hydroxyapatite, X-ray phase analysis
Thermodynamic Aspects of the Stability of Antimony Compounds and their Influence on the Beneficiation Processes of Stibnite
Authors: Kholov Kh.I., Samikhov Sh.R.  

Category: Chemistry | Chapter: Physical Chemistry

  
Keywords: stibnite, antimony, redox potential, pH, thermodynamic analysis, Eh-pH diagrams, flotation reagents, antimony oxides, surface compounds