Abstract: A power supply protection system includes at least one of: a PSE proximal-end protection module (10), arranged at a proximal end of a PSE chip and configured to protect each pin of the PSE chip in a sudden change process of a voltage and current of a proximal-end power loop of the PSE chip; a PSE distal-end protection module (12), arranged between the proximal end of the PSE chip and a PSE network port and configured to suppress interference from a network cable and a network port and reduce a sudden change of a loop of the PSE chip into a range bearable for a proximal end of PSE; a PD distal-end protection module (14), arranged between a proximal end of a PD chip and a PD network port; and a PD proximal-end protection module (16), arranged at the proximal end of the PD chip.

Abstract: Process for enriching the concentration of an enantiomer (or a diastereomer) in a mixture of optically active isomers. The process includes preparing a solution containing the mixture of the optically active isomers and a chiral collector in which the chiral collector and the enantiomer (or diastereomer) are associated with each other. A gas is bubbled through a pool of the solution to form a foam, the surfaces of the bubbles in the foam having the chiral collector and the enantiomer (or diastereomer) preferentially adsorbed thereto so that the concentration ratio of the optically active isomers at said bubble surfaces differs from that in the bulk of the pool. The foam is moved vertically through a column above the pool such that during said movement at least a portion of the bubbles comprising the foam break thereby allowing liquid to drain toward the pool to provide an internal reflux within the column.