767 resultados para Titanium -- Electrometallurgy


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The South American summer monsoon (SASM) is the main source of precipitation for the most densely populated and agriculturally productive regions of tropical and subtropical South America. Here we investigate the impact of the Atlantic Multidecadal Oscillation (AMO) on the SASM using ~4500 yr long proxy records of the discharge variability of the La Plata River Drainage Basin (PRDB), subtropical South America. We measured the stable oxygen composition of planktic foraminifera (related to the extension of the PRDB plume), and Ti intensity in bulk sediment (related to the source of the terrigenous sediments) from a marine sediment core. Spectral and wavelet analyses of our records indicate an oscillation with period of ~64 yr. We conclude that the observed oscillation reflects variability in the SASM activity associated to the AMO. Sea surface temperature and atmospheric circulation anomalies triggered by the AMO would control the variability in SASM activity.

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Bulk Ca and Ti contents and Ti/Ca ratio of sediment core GeoB11804-4, measured by ICP-OES after HF/HNO3/H2O2 microwave pressure digestion.

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Includes indexes.

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"TID-3039(Suppl. 1); Subject Category: Metallurgy and ceramics."

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Mode of access: Internet.

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"March 22, 1955."

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"August 1965."

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"August 1965."

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"Project No. 7351."

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"Materials Central, Contract No. AF 33(616)-6828, Project No. 7351."

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At head of title: Imperial Mineral Resources Bureau.

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At head of title: Imperial Mineral Resources Bureau.