منابع مشابه
Oxygen Isotope Ratios of Large Cosmic Spherules: Carbonaceous and Ordinary
Introduction: Based on petrographic and ion probe investigation of small micrometeorites (150–250 μm), previous studies (e.g. [1]) have concluded that 99% of them should come from carbonaceous, possibly cometary parent bodies (CM/CR related). Our oxygen isotope measurements of 33 large (>500 μm) silicate type cosmic spherules (CS), using IR-laser fluorination/mass spectrometry, indicate that 30...
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Introduction: Cosmic spherules are subspherical to spherical particles of <1 mm diameter which are produced by melting of interplanetary dust and large objects during atmospheric entry. Although cosmic spherules are known principally from the ice sheets of polar regions and Cenozoic deep-sea sediments [1-3], a few spherules older than Mesozoic were recovered from the sedimentary rocks of pelagi...
متن کاملCollisions of Cosmic F- and D-strings
Recent work suggests that fundamental and Dirichlet strings, and their (p, q) bound states, may be observed as cosmic strings. The evolution of cosmic string networks, and therefore their observational signals, depends on what happens when two strings collide. We study this in string perturbation theory for collisions between all possible pairs of strings; different cases involve sphere, disk, ...
متن کاملOxygen isotope ratios of large cosmic spherules: Carbonaceous and ordinary chondrite parent bodies
Oxygen isotope ratios of large cosmic spherules: Carbonaceous and ordinary chondrite parent bodies Conference Item How to cite: Suavet, C.; Alexandre, A.; Franchi, I. A.; Gattacceca, J.; Sonzoghi, C.; Greenwood, R. C.; Folco, L. and Rochette, P. (2009). Oxygen isotope ratios of large cosmic spherules: Carbonaceous and ordinary chondrite parent bodies. In: 40th Lunar and Planetary Science Confer...
متن کاملSpherules and IBV
Infectious bronchitis virus (IBV) is an economically important virus infecting chickens, causing large losses to the poultry industry globally. While vaccines are available, there is a requirement for novel vaccine strategies due to high strain variation and poor cross-protection. This requires a more detailed understanding of virus-host cell interactions to identify candidates for targeted vir...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1983
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.1983.tb01936.x