Many popular direction-of-arrival (DOA) estimators rely on the fact that the array response vector of the array is Vandermonde, for example, that of a uniform linear array (ULA). Array interpolation is a preprocessing technique to transform the array response vector of a planar array of arbitrary geometry to that of a ULA over an angular sector. While good approximation within the target sector is attained in the existing array interpolation approaches, the response of the interpolated array in the out-ofsector region is at best partially controlled. Accordingly, out-ofsector signals, especially those highly correlated with the insector signals, can degrade significantly the performance of DOA estimators (e.g., MUSIC with spatial smoothing) that rely on the Vandermonde form to work correctly. In this paper, we propose an improved array interpolation approach that takes into account the array response over the full azimuth. We present also numerical examples to demonstrate the shortcomings of the existing approaches and the effectiveness of our proposal.
1972. Cell-fusion properties of Sendai virus prepared by polyethylene-glycol precipitation. Can. J. Microbiol. 18: 607-610. Sendai virus was concentrated from the allantoic fluid of embryonated chicken eggs by polyethyleneglycol (PEG) precipitation. A concentration of 6 4 % PEG sufficed to precipitate essentially all of the virus (measured by hemagglutination) with maximum retention of cell-fusion ability. Electron-n~icro-scopic examination of the 6% PEG pellet revealed only intact virions. Thus the method is suitable for preparing Sendai virus for cell-fusion experiments. COOK, G. J., L. A. BABIUK et J. B. HUDSON. 1972. Cell-fusion properties of Sendai virus prepared by polyethylene-glycol precipitation. Can. J. Microbiol. 18: 607-610.Le virus Sendai a ttt concentrt, a partir du liquide allantoi'dien d'oeufs ernbryonnes de poules, par precipitation en utilisant le polyethylkne glycol (PEG). Une concentration de 6-8yo de PEG a Cte suffisante pour prkipiter essentiellement tous les virus (evaluation par hemagglutination) avec conservation maxilnuln de l'habilete a se fusionner A la culture. L'examen au microscope Clectronique des particules de la suspension a 6% de PEG revkle seulement des particules virales intactes. Cette methode convient donc pour la prtparation de virus Sendai en vue d'expkriences de fusion cellulaire.
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