Abstract: In an apparatus for laying down a blanket of foam on a waste disposal landfill or the like, an enlongate manifold carried across the rear end of a vehicle delivers foam to nozzle assemblies which are spaced apart along the length of the manifold. Each nozzle assembly includes a holder in the form of a block with a first bore communicating with the manifold and bifurcating into second and third bores which communicate with nozzles having fan-shaped flat spray patterns. The axes of the bores generally define an inverted Y-configuration with the nozzle of the second bore arranged to spray the foam downwardly to one side and within a plane angled forwardly from a transverse vertical plane with respect to the direction of forward movement of the vehicle, and with the nozzle of the third bore arranged to spray the foam downwardly to the opposite side and within a plane angled rearwardly from the transverse vertical plane.

Abstract: An aqueous foamable membrane-forming composition comprised of a water dispersible polymeric latex, preferably styrene-butadiene latex, and an alkyl ether sulfate surface active agent. The composition desirably contains a alcohol having 12 to 14 carbon atoms, an acrylic acid polymer viscosity modifying agent and powdered carbon. Compositions of the invention in dilute aqueous form can be foamed and deposited on a surface to be covered, such as a landfill. Upon standing, the foam develops into a substantially stable, weather resistent membrane.

Abstract: A method of forming a temporary barrier between a substrate and the atmosphere by applying to the substrate a layer of foam generated from an aqueous composition comprising specified agents. Certain compositions especially adapted for this purpose are also provided.

Abstract: In suppressing coal dust by the application of a foam to a falling mass of coal, a continued dust suppression effect is achieved by foaming a water-diluted emulsion of water, a surfactant, and an oil which exhibits a tacky characteristic when in the form of a film in the absence of water at temperatures within the range from approximately 21.degree. C. down to approximately -12.degree. C.

Abstract: A method is disclosed for forming a water-based inorganic coating capable of controlling thermal radiation which method comprises applying a layer of a semiconductor pigment upon a highly reflective substrate having a metallic layer and overcoating the pigment layer with a layer of an alkali metal silicate, and heat curing the silicate layer at above ambient temperature, where the two-layer laminate so obtained exhibits high absorbance of visible spectral radiation and low emissivity of thermal radiation.

Abstract: A process for the production of hydrogen and oxygen by the cleaving of water which involves the steps of (a) reacting water vapor and iodine vapor in the presence of cuprous iodide at a temperature of 125.degree. to 450.degree. C. to form hydrogen iodide and a solid oxygen-iodine intermediate; (b) recovering the hydrogen iodide formed in step (a); and (c) thermally or photolytically decomposing the recovered hydrogen iodide into hydrogen and iodine, continuously collecting and removing the hydrogen so formed.

Abstract: Certain anion exchange resins containing substantial amounts of cross-linker are useful in the removal of iodine and compounds thereof from gaseous effluents.