Abstract: A method and system for frequency matching a resonant cavity is disclosed. Light is received in a resonant cavity having at least a first mirror and a second mirror defining a path along which light is reflected. At least the second mirror is actuatable to vary the length of the path of the resonant cavity. An intensity of the light exiting or reflecting from the resonant cavity is monitored, and an error correction is determined. The second mirror is actuated towards a pose relative to the first mirror at which a frequency of the light is in resonance with the length of the path. In this manner, the resonant cavity is frequency matched to the light to maintain the resonant cavity in resonance.

Abstract: A testing device is described for use in determining optimum operating conditions for a full size industrial continuous gravity settling unit and for the design of such settling unit. The testing device comprises an elongated, cylindrical settling column having concentric, inner and outer transparent cylindrical walls forming an annular space therebetween filled with transparent heat exchange liquid, with the inner wall defining a cylindrical settling cell. A cylindrical feedwell extends downwardly into the top end of the settling cell, an overflow outlet opening is provided in the inner wall at a location above the bottom end of said feedwell, a solids discharge opening is provided at the bottom of the settling cell and a rotating rake is provided at the bottom of the settling cell for compacting collected solids.

Abstract: In a process for biodegrading under highly alkaline conditions organics in a waste stream derived from a Bayer processing system for producing aluminum oxides,i) the waste stream being typical of oxalate waste streams resulting from alkaline treatment of bauxite, the oxalate waste streams being rich in oxalates, formates, acetates, benzoates and sodium ions and having a pH in excess of 8,ii) treating the highly alkaline waste stream to neutralize and thereby lower pH and to reduce sodium ion concentration prior to introducing the waste stream into a bioreactor,iii) biodegrading the oxalates in the bioreactor by use of Pseudomonas genus microorganisms, andiv) discharging at least a portion of the biodegraded waste stream, the improvement being characterized by:a) introducing the highly alkaline waste stream rich in sodium ions to the bioreactor to avoid the treatment of step ii),b) biodegrading the organics in the waste stream with the Pseudomonas genus microorganisms characterized by ATCC 53883 deposited micr