Abstract: A helicopter hub main retention plate is described made up of graphite and glass fiber reinforced epoxy resin. The graphite fiber reinforcement is in-plane isotropically laid continuous graphite fibers and the glass fiber reinforcement comprises segments of fiberglass continuously and circumferentially wound around the areas of retention. Such materials and configuration provide crack resistance, damage tolerance, and integrity inspectability to the retention plate.

Abstract: A composite torque tube for a helicopter rotor hub is described. The torque tube contains upper and lower load bearing surfaces connected by two sidewall portions. Both the sidewall and load bearing portions contain filament wound glass fiber reinforced epoxy resin such fibers having a .+-.45.degree. orientation. The upper and lower load bearing portions additionally contain a plurality of multiaxially oriented plies of continuous unidirectionally oriented graphite fibers interleaved with the glass fibers so as to produce a torque tube with crack resistance, damage tolerance, light weight, strength and integrity inspectability.

Abstract: A process for producing sulfuric acid and caustic soda by the electrolysis of an alkali metal sulfate in a membrane cell having a hydrogen depolarized anode. Hydrogen gas in the anode chamber is oxidized to produce hydrogen cations which combine with the sulfate anions from the aqueous alkali metal sulfate solution to produce sulfuric acid. Alkali metal ions are transported across the membrane to the cathode to produce caustic and gaseous hydrogen. By oxidizing hydrogen at the anode, the cell voltage for the electrolysis of the alkali metal sulfate is substantially reduced.

Abstract: A semiconductor article having a phosphorous nitrogen passivating film thereon. Particularly, an insulated gate field effect transistor device operating in the inversion mode, wherein the device comprises an essentially oxygen-free, amorphous, phosphorous-nitrogen glass passivating film deposited on a III-V semiconductor material.

Abstract: This invention is directed toward a fiber reinforced resin matrix composite article having fiber reinforced resin matrix bushings. These bushings are formed by tightly wrapping the fibers to form a plug having the fiber orientation from about .+-.20.degree. to about .+-.60.degree. to the central axis around which the fibers are wrapped. The plug is then snugly inserted into a hole which has been cut in the composite article such that the central axis of the plug is perpendicular to the fibers in the composite article. The entire composite article containing the plug is then cured and the plug is then drilled out forming the bushing.

Abstract: A gas generating apparatus and method is described which utilizes a novel catalytic oxygen evolving electrode for such electrochemical systems as electrolysis cells and oxygen concentration cells. The electrochemical cells include a catalytic cathode and an improved catalytic anode positioned on opposite sides of, and in electrical contact with, a cation exchange membrane. A source of direct current potential between the cathode and the anode and means for removing gas from at least one of the electrodes are provided. The improved catalytic anode is a ternary platinum group reduced metal oxide alone or in combination with platinum group metals and/or platinum group metal oxides or mixtures of the foregoing having at least one valve metal component such as titanium, hafnium, zirconium, niobium, tantalum, and tungsten.

Abstract: A method of powering a high temperature molten carbonate fuel cell using direct internal reformation of methanol. The methanol is reformed spontaneously using the anode catalyst and cell waste heat creating hydrogen which is consumed as fuel at the anode and carbon dioxide which is used to enrich the cathode oxidant. In addition, the reformation reaction is endothermic and therefore will aid in managing excess heat at the anode.

Abstract: This invention relates to an anaerobic adhesive and method of making the same, comprising the reactive product of a glycidyl acrylate and a hydroxyl containing polyester. The reaction between the glycidyl acrylate and the polyester typically takes place in the presence of a radical inhibitor and an acid accelerator with oxygen present. The resulting adhesive is a single component, structural adhesive which will cure in an anaerobic environment.

Abstract: A method for determining the spatial and phase distribution of a liquid-vapor multiphase fluid. The method comprises adding a fluorescent monomer and a quencher to the fluid to be studied. The fluid is then dispersed and the monomer excited. The excited monomer combines with the quencher to form a fluorescent exciplex. The monomer fluorescence is predominantly in the vapor phase and the exciplex fluorescence is predominantly in the liquid phase.

Abstract: A novel single-batch method for preparing carbon supported alloy catalysts, wherein one of the metals is a noble metal, preferably platinum and the other metals selected from the transition Groups IV, V, VI or VII. The process comprises sequentially adsorbing the metallic components onto the carbon support. The adsorption takes place in an aqueous medium and the metal components are introduced in the ionic form. The catalyst is finally formed by heating to an elevated temperature.

Abstract: RF absorbing magnet wire is disclosed made up of an electrical conductor such as copper or aluminum coated with at least one layer of polymeric insulation containing electrically and/or magnetically conductive particles. The wire may be made up of a plurality of insulating layers with the particles in the outermost layer. Such magnet wire will aid in eliminating RF interference where certain RF sensitive components, i.e. microprocessors, radios, etc. may be affected.

Abstract: The present invention is directed toward a process for making water soluble polyimide resin systems. The process comprises preparing a solution of a polyamic acid in an organic solvent, adding water to the solution to cause the polyamic acid to precipitate, filtering the precipitated acid, washing the precipitated acid with water to remove the organic solvent and then reacting the washed acid with a water soluble amine forming the water soluble amine salt of the polyamic acid. This polyamic acid salt may then be converted to the polyimide by heating. These water soluble polyamide systems allow for safer application of polyimide coatings to substrates.

Abstract: An improved ternary noble metal-containing, alloy catalyst which has a catalytic activity for the electrochemical reduction of oxygen greater than two and one-half times that of the supported unalloyed noble metal alone. In addition, a disclosure of the method of preparing said catalyst is by intimately contacting two metallic elements with a supported noble metal, then heating this material to form the ternary alloy catalyst. This catalyst has particular utility for the electrochemical reduction of oxygen which makes it particularly useful as a cathode in acid fuel cells. The preferred embodiment of this catalyst is finely divided platinum alloyed with chromium and cobalt supported on an electrically conductive carbon-black support material.

Abstract: A method for the chemical vapor deposition of amorphous, glass-like, phosphorous-nitrogen based films on the surface of a substrate is disclosed. The process entails exposing the substrate to a reactant gas stream comprising phosphorous, nitrogen and hydrogen. This method is particularly suited for passivating Group III-V semiconductor materials.

Abstract: A compliant tubular liner particularly adapted to withstand brisant forces is disclosed. These liners comprising graphite or silicon carbide fiber reinforced glass or glass-ceramic have a high fracture toughness, a relatively low elastic modulus and a high temperature resistance. These articles are particularly useful as gun barrel liners.