There are two types of body waves: compressional (P) waves and shear (S) waves. Primary waves (P-waves) travel the fastest, so they arrive at the recording station (seismograph) first. Secondary or shear waves (S-waves) travel slower than P-waves so they arrive second.
Modified frequency modulation (MFM) is an encoding scheme used by PC floppy disk drives and older hard drives.
Welcome. The Institute of Professional Financial Managers (IPFM), established in 1992, provides an organization for professional, financial managers. The IPFM set out to fill the niche market between the accountancy and treasury management professions.