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The time-dependent component of electrode potential—electrochemical emission (ECE) signal—of polycrystalline titanium Grade 2 alloy during deformation in distilled water has been experimentally investigated. The ECE signal has a continuous component in the frequency band of ∼10–105 Hz and a discrete component in the band of ∼10–103 Hz. Discrete signals were found to be related to the multiple processes of crack formation of the alloy surface layer at the level of individual grains, and the statistical distribution function of discrete ECE signal amplitudes obeys a power law, characteristic of the state of self-organizing criticality. The possible nature of the continuous component of ECE signal is discussed. [ABSTRACT FROM AUTHOR]

Macroscopic jumps of plastic deformation (few percent in amplitude) on creep curves of aluminum–magnesium alloy, caused by a local effect of concentrated solution of hydrochloric acid on the alloy surface, have been revealed and investigated using a complex of high-speed methods for studying the dynamics of deformation bands and discontinuous deformation. Results of computer simulation of the formation of fractal morphology of the corrosion front and elastic stress fields under stress-corrosion conditions are presented. It is shown that, in the complex structure of corrosion boundary, containing "peninsulas" and "fjords," the level of local stress at fjord vertices exceeds the level of applied stress by ~1–1.5 orders of magnitude, which may lead to collective responce of many dislocation sources and development of macroscopic dislocation avalanche, causing a strain jump in the creep curve. [ABSTRACT FROM AUTHOR]

In this work, a novel approach to magnetic nanotheranostics based on the activation of magnetic nanoparticles (MNPs) with a nonheating low-frequency magnetic field has been described. Electromagnetic biomedical technologies implemented in low-frequency nonheating and radiofrequency heating magnetic fields have been briefly reviewed and compared. It has been shown that the activation of MNPs with nonheating magnetic fields has several advantages over activation with heating magnetic fields, namely, a more universal character and penetration ability into tissues, easy dosage and control, higher locality and safety, molecular selectivity, and lower cost. A combination of methods developed and patented by us can form a technological platform for new-generation low-frequency magnetic theranostics which is significantly more effective and possesses more options than conventional radiofrequency theranostics. [ABSTRACT FROM AUTHOR]

Discrete electromagnetic emission caused by a jump of plastic deformation and fracture of single-crystal and polycrystalline ice is revealed and investigated. An album of electromagnetic signals is compiled, which makes it possible, on the basis of the electromagnetic-signal shape, to identify and study the kinetics of mesoscopic events of structural relaxation that are related to the dynamics of dislocation pile-ups and cracks. © 2005 Pleiades Publishing, Inc. [ABSTRACT FROM AUTHOR]

The indentation size effect on the hardness of polycrystalline niobium has been studied. A relationship between the material hardness and the indenter mark dimensions is established in a broad range of indentation depths (20 nm–70 μm). [ABSTRACT FROM AUTHOR]