Wire and arc-based additive manufacturing (WAAM) is a rapidly developing technology which employs a welding arc to melt metal wire for additive manufacturing purposes. During WAAM of thin-walled structures, as the wall height increases, the heat dissipation to the substrate is slowed down gradually and so is the solidification of the molten pool, leading to variation of the bead geometry. Thoug...

– We have extended buffer gas cooling to trap atoms with small effective magnetic moments μeff . For μeff ≥ 3μB, 10 atoms were buffer gas cooled, trapped, and thermally isolated in ultra high vacuum with roughly unit efficiency. For μeff < 3μB, the fraction of atoms remaining after full thermal isolation was limited by two processes: wind from the rapid removal of the buffer gas and desorbing h...

Abstract Through the functional disassembly study of pressurization system, vacuum and atmosphere control water cooling system SPS spark plasma equipment, problems in actual production process corresponding improvements sintering (SPS) equipment are also discussed. The shortcomings its development directions proposed to provide sufficient data support for subsequent research.