Abstract: The presently disclosed subject matter includes a collision warning and avoidance system and method for detecting a collision risk between an interrogating aircraft and at least one interrogated aircraft. Signals received from the at least one interrogated aircraft or by the at least one interrogated aircraft and at least one other interrogating aircraft are used for determining various situation awareness data which is used for determining whether the interrogating aircraft is in a risk of collision. If indeed a collision risk exists a collision warning is generated, the collision warning including data indicative of at least an estimated location of the at least one interrogated aircraft.

Abstract: The presently disclosed subject matter includes a collision warning and avoidance system and method for detecting a collision risk between an interrogating aircraft and at least one interrogated aircraft. Signals received from the at least one interrogated aircraft or by the at least one interrogated aircraft and at least one other interrogating aircraft are used for determining various situation awareness data which is used for determining whether the interrogating aircraft is in a risk of collision. If indeed a collision risk exists a collision warning is generated, the collision warning including data indicative of at least an estimated location of the at least one interrogated aircraft.

Abstract: A treatment plant for the recovery of silver from spent photo fix solution is provided in which the concentration of silver in the spent solution is reduced to meet Environmental Protection Agency standards in two sequential stages. In the first stage, silver is recovered electrolytically by plating out on vertically disposed, rotating cathodes as the spent solution flows from one electrode chamber to another arranged in serial fashion in the electrolytic unit assembly. The silver concentration is then further reduced by passing the overflow from the electrolytic unit upwardly through a column of shredded steel wool or ion exchange resin.