منابع مشابه
Optical properties of carbonaceous dust analogues
Structurally different carbon materials with an increasing sp2/sp3 ratio were synthesized by pyrolizing cellulose materials at 400, 600, 800 and 1000 oC . The hybridization ratios and the internal structures in these sampleswere determined by using High Resolution Transmission Electron Microscopy, Electron Energy Loss Spectroscopy, Raman spectroscopy, IR spectroscopy and elemental combustion an...
متن کاملBacterial morphologies in carbonaceous meteorites and comet dust
Three decades ago the first convincing evidence of microbial fossils in carbonaceous chondrites was discovered and reported by Hans Dieter Pflug and his collaborators. In addition to morphology, other data, notably laser mass spectroscopy, confirmed the identification of such structures as putative bacterial fossils. Balloon-borne cryosampling of the stratosphere enables recovery of fragile com...
متن کاملCarbonaceous onion-like particles as a component of interstellar dust
The search for the carrier of the 217.5 nm absorption feature in the interstellar extinction curve has been undertaken for the past few decades. We have previously discussed a carbonaceous material named quenched carbonaceous composite (QCC) as a laboratory analog for the interstellar material producing this absorption feature. QCC is condensed from an ejecta of hydrocarbon plasma. High-resolut...
متن کاملExploring thermal signatures in the experimentally heated CM carbonaceous chondrite
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متن کاملThermal Metamorphism of Cm Carbonaceous Chondrites: Effects on Phyllosilicate Mineralogy and Presolar Grain Abundances
Introduction: CM carbonaceous chondrites have been constituent materials of hydrated planetesimals in the early solar system. They consist mainly of hydrous minerals as a result of extensive aqueous alteration. At a certain period after the aqueous alteration, many CM chondrites have been heated to higher temperature [e.g., 1], which caused evaporation loss of highly volatile elements [2] and d...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1996
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/283.1.343