870 resultados para physical and chromatographic characterizations


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"This is the second series of essays published by the society. In the first series the name of the society does not occur."--Brit. mus. Catalogue. Academies. 1885. col. 252.

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"Maxinkuckee bibliography": v. 2, p. 449-454.

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Specifications and test methods of the American society for testing materials relating to the paint, varnish and lacquer industry": 3 \U+25a1\., A1-A350 p.

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"National Reactor Testing Station"--Cover.

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Permafrost dynamics play an important role in high-latitude peatland carbon balance and are key to understanding the future response of soil carbon stocks. Permafrost aggradation can control the magnitude of the carbon feedback in peatlands through effects on peat properties. We compiled peatland plant macrofossil records for the northern permafrost zone (515 cores from 280 sites) and classified samples by vegetation type and environmental class (fen, bog, tundra and boreal permafrost, thawed permafrost). We examined differences in peat properties (bulk density, carbon (C), nitrogen (N) and organic matter content, C/N ratio) and C accumulation rates among vegetation types and environmental classes.