“…It was shown that with an immobile field of velocities, a concentration of weakly sorbable components takes place while, with a moving field of velocity, the concentration of the components occurs near their characteristic velocities. Theoretical papers described propagation of perturbations produced during pressure programming (396), a mathematical analysis of velocity programmed chromatography (1588), and a numerical resolution of the equation for the carrier gas pressure in a column in the transient regime (398).…”