Abstract: Alloy of the Ti2AlX type composed at least essentially of the elements Ti, Al, Nb, Ta and Mo and in which the relative amounts as atoms of said elements and of silicon are substantially within the following intervals: Al: 20 to 25% Nb: 10 to 15% Ta: 1.4 to 5%   Mo: 2 to 4% Ti: remainder to 100%. This alloy exhibits properties superior to those of the known titanium alloys.

Abstract: The present invention provides a method for treating volatile hazardous air pollutant (VHAP) and volatile organic compound (VOC) waste products from gas streams. The system disclosed herein employs microporous hydrophobic membranes to remove VHAPs/VOCs from a gas stream into an oleophilic stripping fluid. The stripping fluid is directed into a separate biomembrane reactor wherein the VHAPs/VOCs are transferred across a second microporous hydrophobic membrane into an aqueous nutrient medium, where the extracted VHAPs/VOCs are degraded by microorganisms residing on the surface of the membrane. VHAPs/VOCs are degraded to carbon dioxide, water, and cell debris. The disclosed system uncouples biotreatment from waste generation, such that operation of the biotreatment unit can be continuous and optimized independently of plant work schedules or fluctuations in pollutant concentrations entering the system.

Abstract: In an alloy having a Ti/Al ratio close to 52/48, good castability, by virtue of initial solidification in the .beta. phase, together with a sufficiently low density and a good oxidation resistance are obtained by introducing approximately 2 atom. % of rhenium and/or tungsten. These alloys can be used especially for the production of aeronautical turbomachine components.

Abstract: A dot printing matrix head having printing elements on multiple rows and columns is moved so the columns of the head are translated relative to a medium on which characters are printed. The elements have a predetermined arrangement so that: (1) in each column and row there is at least one element, and (2) there are no elements in adjoining row positions whereby there is no interference between the elements in response to simultaneous activation of any pair of the elements. The elements in different columns of the matrix are activated at differing times in response to signals from at least one shift register bank, a data bit generator and a shift column control circuit as the different matrix columns become aligned with the same column of dots to be printed.

Abstract: The disclosure describes apparatus for checking the operation of control circuits of the type used to actuate the hammers of a printer. A first gating matrix is addressed by a selector so that the control circuits are operated in groups during a plurality of sub-cycles of operation. Detectors which generate an error signal in response to the erroneous operation of each control circuit are connected to the gates of a second gating matrix arranged in the same manner as the first gating matrix. The selector also addresses the second gating matrix so that the detectors which generate error signals can be identified in an error register connected to the second gating matrix.