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 کاملAlignment of atmospheric mineral dust
Alignment of atmospheric mineral dust due to electric field Z. Ulanowski, J. Bailey, P. W. Lucas, J. H. Hough, and E. Hirst Science and Technology Research Institute, Univ. of Hertfordshire, Hatfield AL10 9AB, UK Australian Centre for Astrobiology, Macquarie University, Sydney NSW 2109, Australia Received: 9 July 2007 – Accepted: 3 September 2007 – Published: 10 September 2007 Correspondence to...
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 کاملTwo modes of assessment: the case of academicians' writing
This study attempted to investigate writing problems and the relationship between expert-assessment and self-assessment of writing problems. Participants were thirty four non-English faculty members of Tehran and Guilan universities. The instruments were writing an essay on the topic "What teaching strategies do you use in your classes?" in twenty five lines and filling the questionnaire of wri...
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...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2020
ISSN: 0004-637X,1538-4357
DOI: 10.3847/1538-4357/abb1b4