Abstract: This device comprises a flexible sheet member having cross convolutions oriented 45.degree. to the shear vector with spherical reliefs at the convolution junctions. The spherical reliefs are essential to the shear flexibility by interrupting the principal stress lines that act along the ridges of the convolutions. The spherical reliefs provide convolutions in both directions in the plane of the cross-convolution ridges.

Abstract: A method for chemically removing phosphates from waste waters by treating the phosphate-containing waste water with a trivalent rare earth salt, generally as a mixture of such salts, to form an insoluble rare earth phosphate precipitate, and then separating the precipitate from the waste water. The rare earth precipitant salt, such as lanthanum chloride or sulfate, may be regenerated by treating the rare earth phosphate precipitate with a strong or weak alkali as regenerant, preferably aqueous sodium hydroxide or sodium carbonate, to form a soluble alkali metal phosphate. The aqueous alkali regenerant may be recovered by treatment of the formed sodium phosphate with lime to precipitate the phosphate as a calcium phosphate complex salt.Where it is desired to precipitate phosphate but avoid regeneration of the rare earth precipitant salt, a combination treatment using aluminum-lanthanum or iron-lanthanum as precipitant salt is preferred.

Abstract: Apparatus and method are provided for concurrently decreasing the cyanide and heavy metal content of an aqueous solution, such as a waste water.The apparatus comprises an electrochemical cell provided with separate cathode and anode compartments. Each of the compartments contains a bed of electrically conductive particles. The compartments are separated by an electronically nonconductive foraminous member.In accordance with the method, an aqueous solution containing cyanide ion and at least one heavy metal in soluble form is passed sequentially through the beds of electrically conductive particles contained in each of two compartments of an electrochemical cell. A direct electric current is passed between the two compartments making one compartment cathodic and the other anodic. The heavy metal is deposited upon the particles in the cathodic compartment and the cyanide is oxidized in the anodic compartment.

Abstract: An inducer having a generally conical hub and a plurality of blades projecting substantially perpendicular to the axis of said hub; each of said blades being formed of alar configuration with the tip suction surface leading edges of said blades defining angles of .+-. 0.5.degree. with the relative flow direction of the incident fluid, and having the ratio of the spacing between adjacent blades to the clearance distance between said blade tips and an encircling housing greater than about 70.

Abstract: Method for nondestructive magnetic inspection of an object for detecting defects and discontinuities in a surface thereof, by applying a coating, preferably an organic coating, containing a coloring or opaque material, to the object, for contrast therewith, establishing magnetic flux lines at an angle and preferably substantially perpendicular, to the suspected defects and discontinuities in a surface of the object, applying non-fluorescent magnetic particles, preferably suspended in a liquid medium, over the coating on the surface of the object and causing the particles to agglomerate and form indications on the coating adjacent to the surface defects and discontinuities in the object, and inspecting the body under natural or white light to reveal such defects and discontinuities indications as defined by the agglomerated magnetic particles. Where a record of the indications of defects and discontinuities is desired, a strippable colored, e.g.

Abstract: A sintered filter trap is adapted for insertion in a gas stream of sodium vapor to condense and deposit sodium thereon. The filter is heated and operated above the melting temperature of sodium, resulting in a more efficient means to remove sodium particulates from the effluent inert gas emanating from the surface of a liquid sodium pool. Preferably the filter leaves are precoated with a natrophobic coating such as tetracosane.

Abstract: A method of producing triaminoguanidine nitrate wherein a source of free nitrate ions is provided in an aqueous medium during reaction of guanidine nitrate and hydrazine to increase the yield of triaminoguanidine nitrate.

Abstract: A family of gun propellants formulated with triaminoguanidine ethylenedinitramine (TAGED), as an oxidizer, to reduce the isochoric flame temperature while providing high mass impetus.

Abstract: Propellant inhibitors are provided for cellulose-containing particulate solid propellants, and particularly for nitrocellulose-containing gun propellants, in which the inhibitor is the reaction product of a polyfunctional isocyanate such as polymethylene polyphenyl isocyanate and a polyol such as polyethylene glycol.

Abstract: An integrated nozzle is designed to deflect the jet from a waterjet pump in a watercraft before it leaves the nozzle for watercraft steering. The nozzle may be so configured to be steerable in both the horizontal and vertical planes. The integrated nozzle and steering mechanism with thrust reversal mechanism attached thereto allows a full thrust capability without appreciable friction losses inherent in conventional waterjet steering buckets.

Abstract: An accelerometer comprising a first glass plate mounted in a fixed position, a second glass plate mounted in spaced relation with said first plate and movable with respect to said first plate, an aligning agent coating the facing surfaces of said plates, a nematic liquid crystal mixture filling the space between said plates, means applying an electrical potential between the coated surfaces of said plates, and means for detecting optical characteristics within said liquid crystal mixture.

Abstract: A method of fabricating a group IVB metal hydride body having a hydrogen content of at least 55 atom percent and a high density, which comprises mixing together powders of said metal hydride having less than about 55 atom percent hydrogen with powders of said metal hydride having at least about 60 atom percent hydrogen, and then hot forming the resulting mixture to cause flow of ductile powders and thereby give a high density compact.

Abstract: Composition for ultrasonic inspection of surface and subsurface flaws and discontinuities in bodies, in the form of an aqueous gel containing an N-alkyl-2-pyrrolidone having a short alkyl chain, preferably N-methyl-2-pyrrolidone, a water soluble surfactant, e.g. a nonyl phenyl ether of polyethylene glycol, and silica, preferably in fine powder form, suspended uniformly in the gel. The composition or gel is applied to a surface of a body such as a metal aircraft structural part, and a probe or transducer of an ultrasonic testing device is contacted or pressed against the gel and the transducer is caused to move or slide in various directions on the gel to transmit ultrasonic energy through the gel and the object, to inspect the object and locate any surface or subsurface flaws or discontinuities.

Abstract: A water washable substantially biodegradable dye penetrant composition having excellent sensitivity and high stability, for use in non-destructive testing of objects to locate voids and defects therein, said composition consisting essentially of an organic dye, preferably a fluorescent dye, and a carrier or solvent for said dye, in the form of a mixture of certain ethoxylated linear alcohols, particularly a combination of biodegradable nonionic surfactants each comprised of ethoxylates of a mixture of secondary alcohols having linear alkyl chains of from 11 to 15 carbon atoms, one of which contains an average of 5 moles of ethylene oxide, and another of which contains an average of 9 moles of ethylene oxide.

Abstract: A method is shown for removing sulfur dioxide from a hot flue gas by absorption of the sulfur dioxide in an aqueous solution or slurry containing no more than 40 wt.% of an alkali metal carbonate or bicarbonate, preferably sodium carbonate and/or sodium bicarbonate using a spray-dryer scrubber to produce a dry mixture of sodium sulfite, sodium sulfate, and sodium carbonate and/or bicarbonate. Such a mixture is directly suitable as a feed to a regeneration stage.It is particularly preferred to regenerate the absorbent and recover commercial sulfur values in a closed-cycle process by next treating the solid absorption product in a molten salt reduction step with a reducing agent, preferably a carbonaceous material, to reduce the sodium sulfite and sulfate to sodium sulfide. Concurrently, a source of oxygen is fed to the reducer to generate sufficient heat therein for the reduction step by a combustion reaction.