A fine channel device capable of producing fine particles in an industrial scale, hardening the fine particles immediately after the production and recovering the fine particles from a medium without collapsing the shape of the produced fine particles, a fine particle producing method using the fine channel device and a solvent extraction method using the fine channel, are presented. The blocks of data are extracted in order and directed to at least one output. The DCEM server sums output direct current power of the power supply to a total DC power of the data center and reports a ratio of total AC power to total DC power as data center power conversion efficiency. The invention may employ either permanent magnets or electromagnets for generation of the mass-separation magnetic field. The request may include a session identifier of the SSL session.