The guided wave has been widely employed to characterize thin plates and layered media. The dispersion curves of phase and group velocities are essential for the quantitative application of guided waves. The technique using leaky Lamb wave (LLW) is one of the excellent methods to obtain dispersion curves. In the present work, a fully automated system for the measurement of LLW has been develope...

Leading logarithmic corrections to the difference of Lamb shifts of s-states EL(1s) − 8EL(2s) and to the life time of 2p1/2 state are considered. The result of Sokolov and Yakovlev for the Lamb splitting of 2s1/2 and 2p1/2 is reevaluated and our new value is 1057.8576(21) MHz. Using value of EL(1s)− 8EL(2s) = -187.237(8) MHz, obtained here, a new value of the Hydrogen and Deuterium ground state...