منابع مشابه
Dating the past with Radioactivity
Very soon after the discovery of radioactivity, measurements of the heavy radioactive elements existing in nature were undertaken to determine the age of rocks (Rutherford 1904), but only when Professor Willard Libby in an evening lecture during the first United Nations Conference on the Peaceful Uses of Atomic Energy in Geneva in 1955 described how he and his research team had evolved the carb...
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Around the time that On the Origin of Species was published, Lord Kelvin authoritatively stated that the Earth was between 20 and 400 million years old, a range still quoted today by many who deny evolution. As it was difficult to conceive of life’s diversity arising via natural selection and speciation in so short a span, the apparent young Earth formed a serious barrier to the plausibility of...
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An on-line version of the Steiglitz-McBride algorithm that is consistent in the presence of colored noise is proposed. In addition, a proof of local convergence of the new algorithm is provided. Some computer simulations are included showing that the consistent Steiglitz-McBride algorithm is useful for IIR adaptive filtering when the measurement noise is colored.
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A t the mention of mitochondria, do you visualize little lozenge-shaped organelles that sit passively in the cytoplasm, quietly brewing up ATP and only getting to do something exciting after being enlisted in an apop-totic cascade? That image, comforting though it may be, is woefully incomplete. In fact, says McGill University's Heidi McBride, mitochondria are highly dynamic organelles that for...
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ژورنال
عنوان ژورنال: American Anthropologist
سال: 1975
ISSN: 0002-7294,1548-1433
DOI: 10.1525/aa.1975.77.4.02a00380