971 resultados para quasi-periodicity
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Mode of access: Internet.
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Mode of access: Internet.
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Cover title.
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"The impression for sale is one hundred copies folio and seven hundred and fifty copies quarto.
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Mode of access: Internet.
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Contiene además: "Principis Federici Caesii ... De caeli vnitate, tenvitate, fusaque & peruia stellarum motibus natura ... ad ... Robertum Bellarminum ... epistola": pp. [775]-784
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Bibliography: leaves 16-17.
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Mode of access: Internet.
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Mode of access: Internet.
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"In cooperation with National Botanic Gardens Lucknow, India."
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Bibliography: p. 77-83.
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The design of an X-band tray-type spatial power combiner, which employs uniplanar quasi-Yagi antennas (QYAs) for receiving and transmitting signals by individual amplifiers, is presented. Passive and active varieties of a seven-tray power-combining structure that includes two hard horns for uniform signal launching and combining across the tray stack are developed and measured. In order to compensate for nonuniform phase across the stack, which is caused by the nonplanar wave front of the horn antennas, Schiffman phase shifters are implemented in individual trays. The experimental-results show an improved performance of the investigated tray-type power combiner when the proposed phase-error compensation is implemented. (C) 2004 Wiley Periodicals, Inc.
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We consider plane waves propagating in quadratic nonlinear slab waveguides with nonlinear quasi-phase-matching gratings. We predict analytically and verify numerically the complete gain spectrum for transverse modulational instability, including hitherto undescribed higher-order gain bands. (C) 2004 Optical Society of America.