Abstract: An active retrodirective antenna array having central phasing from a reference antenna element through a "tree" structured network of transmission lines utilizes a plurality of phase conjugate circuits (PCCs) at each node and a phase reference regeneration circuit (PRR) at each node except the initial node. Each node virtually coincides with an element of the array. A PCC generates the exact conjugate phase .phi.*.sub.1 of an incident signal .phi..sub.1 in accordance with the relation R (2.phi..sub.0 -.phi..sub.1) where R is equal to the reciprocal of 1-2/n, and n.gtoreq.4, using a phase locked loop which combines the phases .phi..sub.1 and .phi.*.sub.1 in an up-converter, divides the sum by 2 and mixes the result with the phase .phi..sub.0 in a down-converter for phase detection by the phase .phi.*.sub.1 from the loop oscillator divided by n. The PRR extracts the phase .phi..sub.0 from the conjugate phase .phi.*.sub.1 by mixing .phi.*.sub.

Abstract: An anti-inflammatory and analgesic composition containing indomethacin and an H.sub.2 histamine receptor antagonist in an amount sufficient to reduce gastric distress caused by the indomethacin. Usable antagonists are metiamide and cimetidine.

Abstract: Apparatus for providing thermal and pressure sealing in an elongated space of varying width between adjacent surfaces of first and second members mounted for at least limited lateral movement therebetween. The apparatus may comprise: a first elongated support member attached to one of the adjacent surfaces; a second elongated support member attached to the other of the adjacent surfaces; and an elongated seal member sandwiched between the first and second support members. In its non-deformed state, the elongated seal member may be substantially cylindrical but capable of deformation to accommodate limited lateral movement between the adjacent surfaces and varying widths of the space therebetween.

Abstract: In combination with a pulse transducer characterized by a source of light and a detector for light reflected from blood vessels of a living body, to provide heart signal consisting of a modulated dc signal voltage indicative of the pulse rate for the body, an artifact signal resulting from a reflection of light from the skin of the body, which includes both a constant dc signal component and a modulated dc signal component the amplitude of which is greater and the frequency of which is less than said heart signal, a signal attenuator circuit including an operational amplifier for canceling said artifact signal from the output signal of the pulse transducer.

Abstract: A radio-frequency glow discharge reactor for removing trace oxidizable contaminants from an oxygen bearing atmosphere including a reaction chamber defined by an inner metal electrode facing a dielectric backed by an outer conductive electrode. In one embodiment, a conductive liquid forms the conductor of an outer electrode and cools the dielectric. A resonator coupled to a variable radio-frequency source generates the high voltages for creating a glow discharge in the chamber at a predetermined pressure whereby the trace contaminants are oxidized into a few simple non-toxic products that may be easily recovered. The corresponding process for removal of trace contaminants from an oxygen-bearing atmosphere with high efficiency independent of the concentration level is also disclosed.