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Volume rendering of the gravitational radiation generated during the merger of a binary black hole system. The red spheres represent the horizons of the black holes. The color map shows positive wave amplitudes in yellow/red and negative amplitudes…

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from article Gravitational radiation

Effect of a gravitational wave, passing in a direction perpendicular to the plane of the paper, on a ring of test particles. The ring is distorted into an ellipse, elongated in one direction in one half-cycle of the wave, and elongated in the…

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from article Gravitational radiation

Orbital decay of the binary pulsar PSR 1913+16, discovered by Russell Hulse and Joseph Taylor in 1974. Data points show the measured change in the orbit (the periastron is the minimum separation of the pulsar from the center of mass of the binary…

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from article Gravitational radiation

The gravitational-wave signal GW150914, recorded by the LIGO detectors at Hanford, Washington, and Livingston, Louisiana, on September 14, 2015. The thick orange and blue lines show the data from the Hanford and Livingston detectors, respectively,…

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from article Microwave impedance measurement

Microwave system, with complex traveling-wave amplitudes a and b that are generally used to describe the electric and magnetic fields.

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from article Microwave impedance measurement

Two-port network showing (a) the voltages and currents used in y-parameter definitions, and (b) the incident and reflected complex-wave amplitudes used in scattering-parameter definitions.

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from article Microwave impedance measurement