Modeling the Destruction of an Anisotropic Composite Barrier in Interaction with Slender Strikers at an Angle

Journal of Engineering Physics and Thermophysics - A numerical investigation has been made into the interaction of slender (5–20 calibers) steel cylinder strikers with orthotropic compost...     

Effect of current source characteristics on powder particle size in electric-pulse atomization

Conclusions Tests of a high-power current pulse source with a capacitive energy accumulator for the atomization of metal jets have shown it to be suitable for the production of very fine powders. Depending on the diameter of the jet being disrupted, there exists some limiting value of capacitor battery capacitance above which the particle size analysis of the powder undergoes no marked changes. Increasing the initial battery voltage at an unchanged battery energy is accompanied by a substantial increase in the yield of fine powder fractions.Translated from Poroshkovaya Metallurgiya, No. 1(265), pp. 5–10, January, 1985.     

Introducing Digital Twins of High-Speed Machining in the Manufacturing Life Cycle

Russian Engineering Research - The use of digital technology in metal cutting is considered. In particular, as an example, digital twins are used in the design of machining by end mills. Digital...     

Determining the Cut Thickness in Milling Complex Surfaces

Russian Engineering Research - A new approach is proposed for calculating the cut-layer thickness in three-dimensional milling by radial end mills. The error in calculating the cut-layer thickness...     

Fuel-rich methane combustion: Role of the Pt dispersion and oxygen mobility in a fluorite-like complex oxide support

For catalysts comprised of Pt supported onto dispersed complex fluorite-like oxides (ceria doped by Pr, Gd, Sm, or CeO₂–ZrO₂ doped by La, Gd or Pr), the effects of the oxygen mobility in supports and Pt dispersion on the performance in methane selective oxidation into syngas at short contact times were elucidated using combination of kinetic and spectroscopic methods. While in general any simple universal relation between the oxygen mobility, Pt dispersion and the rate of methane transformation into syngas was not found, for some series, a good correlation was observed agreeing with the bifunctional scheme of the methane selective oxidation into syngas.     

Effect of composition of copper-tin melts and bronzes on the particle size of powders produced by the electric-pulse disintegration of jets

Conclusions The results are presented of an investigation into the effect of composition of coppertin bronzes on the particle size distribution of powders and granules produced by the electric-pulse disintegration of a jet. On passing from copper to Cu-Sn alloys and then to pure tin, the proportion of fine fractions (< 160 m) grew from 7.5 to 22.7%, the amount of medium fractions also increased, and at the same time that of coarse fractions decreased, which was due to the surface tension of the melts falling from 1350 for pure copper to 540 mJ/m² for tin. Additions of 5% each of zinc and cadmium to Br 0–10 bronze resulted in the yield of fine fractions rising from 10 to 14.4 and 18.8%, respectively. The action of these elements consists in increasing the vapor pressure, which results in the generation of more powerful shock waves in the zone of the electric arcs appearing during breaks in the jet. The addition of phosphorus, which forms with copper a stable compound, has comparatively little effect on the particle size distribution of powders.Translated from Poroshkovaya Metallurgiya, No. 1(289), pp-1–4, January, 1987.     

Investigation of Textural Features for the Problems of Bone Marrow Cell Recognition in Information-Measuring Systems of Oncohematology

Measurement Techniques - The influence of the parameters of constructing a matrix of spatial adjacency on textural features in the problems of recognizing bone marrow cells in information-measuring...