Muffin-tin approximation Muffin-tin approximation The muffin-tin approximation is a shape approximation of the potential well in an crystal lattice. It is most commonly employed in quantum mechanical simulations of the electronic band structure in solids. The approximation was proposed by John C. Slater. Augmented plane wave method (APW) is a method which uses muffin-tin approximation. It is a method to approximate the energy states of an electron in a crystal lattice. The basic approximation lies in the potential in which the potential is assumed to be spherically symmetric in the muffin-tin region and constant in the interstitial region. Wave functions (the augmented
Anniversary Trouble Anniversary Trouble Anniversary Trouble is a 1935 "Our Gang" short comedy film directed by Gus Meins. It was the 134th "Our Gang" short (46th talking episode) that was released. Spanky's appointment as treasurer of the Ancient and Honery Order of Woodchucks occurs on the same day as his parents' wedding anniversary. Spanky's father (Johnny Arthur) puts money in an envelope as an anniversary gift for his wife (Claudia Dell), then absent-mindedly uses the envelope as a bookmark. Spanky's mother sees Spanky hide the gang's club money in a cookie jar and jumps to the conclusion that Spanky stole her gift