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
Lead 15th Anniversary Live Box DVD held their fifteenth live tour "Lead Upturn 2017 ～This is Our Day～". The live box charted at #59 on the Oricon DVD charts and #61 on the Blu-ray charts, remaining on the charts for one week. "Lead 15th Anniversary Live Box" is a DVD/Blu-ray two disc collection released by the Japanese hip-hop group Lead on December 20, 2017. It charted #59 on the Oricon DVD charts and #61 on the Oricon Blu-ray charts, where it remained on both for one week. The live box featured two separate performances spanning across two DVD/Blu-rays to celebrate the group's fifteenth anniversary in