Abstract: A radio radio quasi-circulator-jammer system, which connects a transceiver and a jammer unit to a single antenna, for isolating the transceiver from the co-located transmitter jammer. The radio quasi-circulator-jammer system includes includes a quasi-circulator having a transformer, a matched electrical load having an electrical impedance substantially matched to the antenna electrical impedance and three radio signal splitters adapted to split incoming radio power signals into two substantially equal outgoing radio power signals.

Abstract: A laser shock peening method including laser shock peening a first area with at least one high fluence normal laser beam and laser shock peening a border area between the first area and a non-laser shock peened area of the article with at least one first low fluence oblique laser beam. The border area may be laser shock peened with two or more low fluence oblique laser beams. The second low fluence oblique laser beam and others have a lower fluence than the first low fluence oblique laser beam. The border area may be laser shock peened with progressively lower fluence oblique laser beams starting with the one first fluence oblique laser beam wherein the progressively lower fluence oblique laser beams are in order of greatest fluence to least fluence in a direction outwardly from the first area through the border area to the non-laser shock peened area.

Abstract: Backscatter imaging using Hadamard transform masking includes an area x-ray source with alternating, masked, Hadamard transform patterns. The total backscatter signal from a target for each pair of corresponding masks is recorded. The difference in signal strengths for each pair of corresponding masks is a direct measurement of the Hadamard transform coefficient for that mask. An image of the target is formed by performing an inverse discrete Hadamard transform on the complete matrix of coefficients.