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
Wedding cord Wedding cord The traditional wedding cord, also known as the wedding lasso, is a piece of wedding paraphernalia used in some Christian Catholic wedding ceremonies. This is actually a representation of a loop of rosary beads made out of white satin or silk. During the wedding proper, this is traditionally formed into a figure-of-eight shape, and then placed around the neck areas of the bride and the groom after they have made their wedding vows, and are already kneeling on pillows for the pronouncement of a wedding prayer. This cord symbolizes lifetime unity or the everlasting union of the bride