We consider the question of whether cosmic ray catalysed false vacuum decay can be phenomenologically more important than spontaneous decay via quantum tunnelling. We extend the zero bubble wall width Landau-WKB analysis of catalysed false vacuum decay to include the leading order effects of finite wall width and derive an expression for the thin-wall bubble action. Using this we calculate the ...

An 80%Ar-10%CO2-10%He ternary gas mixture was used as the shielding during narrow-gap welding of thick Q690E high-strength steel plates. Complete and defect-free welded joints were obtained, microstructure mechanical properties joint investigated. The weld zone consists a solidification area interlayer zone, heat-affected coarse-grain (CG-HAZ) fine-grain (FG-HAZ). microstructures are mainly lat...

The paper presents a numerical analysis of thick-walled PA66 GF30 moldings with the addition chemical blowing agent content 1-3 wt%, and obtained results were compared real object. Computer simulations performed using Moldex3D ® software. Based on analysis, it was found that regardless dose used, largest pores place in core sample. Moreover, size depends their number cross-section moldings. Com...