منابع مشابه
Extreme enrichment in atmospheric 15 N 15 N Laurence
Department of Earth, Environmental and Planetary Sciences, Rice University, Houston, TX 77005, USA. Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, Los Angeles, CA 90089, USA. Department of Integrative Biology and Department of Energy Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI 48824, USA. Department of Earth and ...
متن کاملUltra - violet absorption cross sections of isotopically substituted nitrous oxide species : 14 N 14 NO , 15 N 14 NO , 14 N 15 NO and 15 N 15 NO
The isotopically substituted nitrous oxide species 14N14NO, 15N14NO, 14N15NO and 15N15NO were investigated by ultra-violet (UV) absorption spectroscopy. High precision cross sections were obtained for the wavelength range 181 to 218 nm at temperatures of 233 and 283 K. These data are used to calculate photolytic isotopic fractionation constants as a function of wavelength. The fractionation con...
متن کاملFractionation of 14 N 15 N 16 O and 15 N 14 N 16 O During Photolysis at 213 nm
Motivated by Yung and Miller’s suggestion [1997] that N2O is isotopically fractionated during UV photolysis in the stratosphere, we have studied the photolysis rates of the NNO and NNO structural isotopomers. In this study, we follow the concentrations of these compounds with FTIR spectroscopy during photolysis at 213 nm. Our results show that, as Yung and Miller predicted, the photolysis rate ...
متن کاملLa numérisation des catalogues : une analyse rétrospective
In the sector of the library all the professional activities reset on the creation and the management of the catalogues. The digitalization of those is an ambitious project whose complexity is difficult to evaluate and to manage. In this paper we are interested with in the problems arising at the practical implementation of such a project. We start by an introduction, then we define the bibliog...
متن کاملLiquid state 15 N NMR studies of 15 N isotope labeled phthalocyanines
N labeled soluble metalloand metal-free phthalocyanines are described for the first time. The complexes were synthesized starting from phthalic anhydride derivatives using 98% N enriched urea. The effects of the substitution pattern, aggregation, and coordinated metal on N chemical shifts in liquid state NMR were studied.
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ژورنال
عنوان ژورنال: Traduire
سال: 2009
ISSN: 0395-773X,2272-9992
DOI: 10.4000/traduire.363