A process in a physical system, or a mathematical model such as a cellular automaton or a statistical model, whereby a bubble or other structure appears spontaneously at a random or unpredictable spot
the initial stage in a phase transformation; it is evidenced by the formation of small particles (nuclei) of the new phase which are capable of growing
Also termed grafting or implantation Process of inserting a hard bead nucleus or piece of soft mantle tissue into a mollusc body or mantle of the mollusc The nucleus or mantle tissue serves as the 'seed' to irritate the mollusc to produce a pearl
the initial stage in a phase transformation It is evidenced by the formation of small particles (nuclei) of the new phase, which are capable of growing O