841 resultados para Mitchell, John Cameron


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Mode of access: Internet.

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Wright II, 1724.

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Publisher advertisement on last page.

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"Erratum", inserted, p. 19.

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Mode of access: Internet.

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Chiefly tables.

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Top Row: Ath. Dir. Philip Bartelme, Alfred Verheyen, Howard (?) Campbell, Elmer Mitchell, John J. Walsh, Wilfred Waltner, student mngr Harold I. Haskins

Middle Row: J. Griffith Hayes, Norman Hill, coach Branch Rickey, Clarence Enzenroth, Thompson Lothrop

Front Row: Stanley Drake, John Campbell, Lloyd Marlin

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We present a novel concept of tailored GTE structure and show that such devices are very useful for the realization of DSC with almost arbitrary dispersion profile and also with tunability in dispersion slope.

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We present a novel concept of a tailored Gires-Tournois etalon structure and show that such a device is useful for the fabrication of a dispersion-slope compensator with an almost arbitrary dispersion profile and also with tunability in the dispersion slope. © 2004 Optical Society of America.

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We report a novel tunable dispersion compensator (TDC) based on all-fiber distributed Gires-Tournois etaIons (DGTE), which is formed by overlapped chirped fiber gratings. Two DGTEs of opposite dispersion slope work together to generate a tunable periodical dispersion profile. The demonstrated TDCs have the advantages of multichannel operation, extremely low group-delay ripple, low loss, and low cost.

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Ne, Ar, Kr, Xe, and K2O were measured in representative samples of holocrystalline basalt from DSDP Hole 504B. No hiatus in inert gas abundance is recognized at the base of the "oxic" alteration zone and the extent rather than the nature of alteration appears to determine these abundances. When the inert gas abundances are separately plotted against K2O, two distinct trends of loss emerge, one for alteration involving K-gain, the other for K-loss. Apparent whole-rock K-Ar ages are anomalous in the upper 50 m of basement, and below 300 m sub-basement. In the intervening zone of basement, celadonization adds sufficient potassium and eliminates enough "primary" 40Ar early in the history of the basalts for "excess" 40Ar to become subordinate to radiogenic 40Ar in basalts showing potassium enrichment greater than 0.2%. Stratigraphically correct K-Ar ages are obtained, therefore, from K-enriched basalts of the oxic alteration zone.