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The samples produced by friction stir welding of 35 mm thick rolled sheets of thermally non-heat-treatable aluminum-magnesium alloy AA5056 were investigated in this work. Macro- and microstructure was studied on metallographic specimens cut in a planar section relative to the welding zone through the thickness of the workpiece. It was found that in the zone of tool inlet the weld metal is extruded, then there is an adhesive interaction of the tool and welded material with its further layer-by-layer transfer, as a result of which the structure is represented by a mixture of material flows along the contour of the tool. [ABSTRACT FROM AUTHOR]

This work is devoted to the study of the features of surface wear of tool steel at adhesive contact with an aluminum alloy. It is revealed that with increasing speed and friction distance the depth of the wear path increases as well. With further increase in the speed, the wear depth is reduced due to the fact that adhesive processes are activated at high friction rates and a transfer layer is formed on the steel disc surface. It was observed that the difference in friction coefficient values is not large, which means that the dependence of friction coefficient on the speed is insignificant. [ABSTRACT FROM AUTHOR]

Invasive ablation of cancer cells using radiofrequency-heating techniques has been demonstrated clinically, but the current methodology still has many flaws, including inconsistent tumor ablation, and significant healthy cell death1. Research has been done to develop a method that is both non-invasive and more selective for the cancer cells using metallic nanoparticles and constant electric field exposure2,3. The mechanism by which cell necrosis is achieved in these studies is the heating of functionalized metallic nanoparticles, which are attached to the cancer cells via antibody conjugation. Our approach to studying this phenomenon is to use similarly functionalized metallic nanoparticles that are specific for the T47D breast cancer cell line, but expose these nanoparticle-cell conjugates to a nanosecond pulsed electric field. The percentage of cells killed from hyperthermia can then be assessed using hemacytometer cell staining and counting techniques. [ABSTRACT FROM PUBLISHER]