Reverse osmosis membrane technology has grown dramatically in recent years for the production of fresh water and is particularly important in the purification and reuse of water in space missions. The present invention contemplates the fabrication of membranes of allyl amine as thin films in the presence of a plasma discharge. The membranes are superior in that they do not have to be stored in pure H2O, demonstrate salt rejection rates of 95% or more, do not compress under use, are formed without pinholes, and in any desired configuration, and, possess high adhesion on a variety of substrates. SUPPRESSION OF FLUTTER NASA Case No. LAR-10682-1 Great Britain, Japan, France, Address inquiries to: Langley Station [Corresponding to U. S. Patent No. 3,734,432] An active aerodynamic control system is described for controlling flutter over a large range of oscillatory frequencies unaffected by mass, stiffness, elastic axis, or center of gravity location of the system, mode of vibration, or subsonic Mach number. It consists of one or more pairs of leading edge and trailing edge, hinged or deformable control surfaces, each pair operated in concert by a stability augmentation system. Torsion and bending motions or deflections of the fluttering member are sensed and converted by the stability augmentation system into leading and trailing edge control surface deflections which produce lift forces and pitching moments to suppress flutter. IMPROVEMENTS FOR ABATING EXHAUST NASA Case No. ARC-10712 Australia, Canada, France, Address inquiries to: Mail Code: 200-11A [Corresponding U.S. Patent - Application Pending] A noise abating improvement for jet engines including the provision of apparatus in the primary flow stream of gas turbine engines such as turbojet, turbofan, turboprop, and other jet engines such as ram jets, scram jets and hybrid jet engines, or in either the primary and/or secondary flow streams of turbofan engines or the like, for imparting to the exhaust gases a component rotation or swirl about the engine's longitudinal axis. The rotary component in the exhaust gases has the effect of substantially suppressing the build up on sound energy normally produced by an axial flow exhaust stream. The closed cell, semi-rigid, fiber-loaded self-extinguishing foam of the present invention has properties of retarding penetration of incendiary ballistics, prevention of fire in the void spaces of the aircraft, providing support for the fuel cell, and strengthening the aircraft frame. The foam is based on a polyurethane resin and is filled with fibers and contains a fire retardant material. It does not produce noxious fumes when heated and the strength of the foam is enhanced by the fibers being oriented parallel to the surface of the substrate on which the foam is sprayed. Salt crystals used in IR spectrocopy required they be preserved in areas that are not dehumidified. If moisture forms on the crystal, etching results which destroys the effectiveness of the crystal. This invention contemplates coating the crystal with a perfluorinated polymer which not only prevents attack by moisture, but often has the added advantage of acting as an anti-reflective coating so that transmission is increased in nearly all regions of the IR spectrum. |