From practical methods to theoretical foundations

The year 2006 marks the ninetieth anniversary of the air navigation (later called navigation) service of the Air Forces of this country. The history of air navigation is investigated, and an opinion about its modern state and directions of further development is presented.     

Influence of solution pH and anion composition on the electrical resistance of films on nickel

Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 11, pp. 31–33, November, 1991.     

Inverted surface hysteresis loops in heterogeneous (nanocrystalline/amorphous) Fe<Subscript>81</Subscript>Nb<Subscript>7</Subscript>B<Subscript>12</Subscript> alloys

Inverted hysteresis loops were observed for the first time in the near-surface layers of heterogeneous (nanocrystalline/amorphous) Fe₈₁Nb₇B₁₂ alloys. In particular, a negative residual magnetization is retained when a positive magnetic field applied in the sample plane is decreased to zero. The inverted hysteresis is qualitatively explained within the framework of a two-phase model, according to which the heterogeneous alloys contain two dissimilar phases exhibiting uniaxial magnetic anisotropy and featuring antiferromagnetic exchange interaction.     

Effect of annealing on the structure and mechanical properties of the maraging steel N9K17M14-nanoamorphous alloy Co69Fe4Cr4Si12B11 composite material

The effect of annealing on the structure, mechanical properties, and fracture of a one-dimensional composite material consisting of a microwire made of maraging N9K17M14 steel with a surface layer of a eutectic soft magnetic Co₆₉Fe₄Cr₄Si₁₂B₁₁ alloy is studied. The optimum temperature of annealing of the composite material is found; as a result, high strength characteristics are achieved at good plasticity. The composite material with a nanoamorphous layer is shown to have the high strength characteristics of the matrix maraging steel at significantly higher plasticity. When the Co₆₉Fe₄Cr₄Si₁₂B₁₁ alloy is deformed in the composition of the composite material, it exhibits a plasticity effect, and this alloy fails in a brittle manner when deformed in the form of a wire or a ribbon. This effect becomes more pronounced upon annealing.     

Calculation of the number of cross-current plates in rectification

Chemistry and Technology of Fuels and Oils -     

Deformation and fracture of a composite material based on a high-strength maraging steel covered with a melt-quenched Co<Subscript>69</Subscript>Fe<Subscript>4</Subscript>Cr<Subscript>4</Subscript>Si<Subscript>12</Subscript>B<Subscript>11</Subscript> alloy layer

Multifractal analysis is used to study the deformation and fracture of a promising composite material consisting of a wire base made of K17N9M14 maraging steel covered with a surface layer made from a Co₆₉Fe₄Cr₄Si₁₂B₁₁ amorphous alloy. As compared to its components, this material has a substantially better set of the mechanical properties.