900 resultados para molecular self-assembly, on-surface reactions, atomic force microscopy


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Radiocarbon ages on CaCO3 from deep-sea cores offer constraints on the nature of the CaCO3 dissolution process. The idea is that the toll taken by dissolution on grains within the core top bioturbation zone should be in proportion to their time of residence in this zone. If so, dissolution would shift the mass distribution in favor of younger grains, thereby reducing the mean radiocarbon age for the grain ensemble. We have searched in vain for evidence supporting the existence of such an age reduction. Instead, we find that for water depths of more than 4 km in the tropical Pacific the radiocarbon age increases with the extent of dissolution. We can find no satisfactory steady state explanation and are forced to conclude that this increase must be the result of chemical erosion. The idea is that during the Holocene the rate of dissolution of CaCO3 has exceeded the rain rate of CaCO3. In this circumstance, bioturbation exhumes CaCO3 from the underlying glacial sediment and mixes it with CaCO3 raining from the sea surface.

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"March 1961."

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1964 ed. published under title: Releasable data on USAF aerospace vehicles.

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At head of title: Air Research and Development Command. Wright Air Development Center. Contract AF 33(616)-3032.

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Mode of access: Internet.

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The Open Space Lands Acquisition and Development (OSLAD) grant program (525 ILCS 35/1 et. seq.), administered by the Illinois Dept. of Natural Resources, was enacted in FY86 to assist eligible local government agencies in the acquisition and/or development of lands for public outdoor recreation and resource preservation purposes.

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"... prepared in fulfillment of the requirements of Public Act 92-0051..."