Fluffy thinking
نویسندگان
چکیده
منابع مشابه
Free molecular gas drag on fluffy aggregates
Dynamical behaviors of dust particles are governed by gas drag forces in a variety of environments of astrophysical interest, such as protoplanetary disks, upper planetary atmospheres or cometary coma. Monte Carlo (MC) and Quasi Monte Carlo (QMC) simulations have been performed to estimate the drag forces on fluffy aggregates in the free molecular limit, using two different models of molecule-s...
متن کاملCan Fluffy Dust Alleviate the Subsolar Interstellar Abundance Problem?
What might be the most appropriate set of interstellar reference abundances of chemical elements (both in gas and in dust) relative to hydrogen has been a subject of much discussion during the past decade. While historically the Sun has been taken as the reference standard, it has recently been suggested that the interstellar abundances might be better represented by those of B stars (because o...
متن کاملNoble Gases in Allende Fluffy and Compact Cais
The Ne and Ar isotopic composition of Allende CAIs can consistently be explained by cosmogenically produced Ne and Ar. Thereby, the extraordinary chemistry of CAIs and the large preatmospheric size of Allende, which may cause significant cosmogenic production of Ar from Cl, were taken into account. In contrast to earlier workers, we conclude that no trapped noble gas components are needed to ex...
متن کاملCan Composite Fluffy Dust Particles Solve the Interstellar Carbon Crisis?
Recent observations suggest that the abundance of carbon in the interstellar medium is only ∼ 60% of its solar value, and that other heavy elements may be depleted by a similar amount. Furthermore, more than half of the interstellar carbon is observed to be in the gas in the form of C, leaving less than ∼ 40% of the solar carbon abundance available for the dust phase. These observations have cr...
متن کاملMagnetic properties of fluffy Fe@α-Fe2O3 core-shell nanowires
: Novel fluffy Fe@α-Fe2O3 core-shell nanowires have been synthesized using the chemical reaction of ferrous sulfate and sodium borohydride, as well as the post-annealing process in air. The coercivity of the as-synthesized nanowires is above 684 Oe in the temperature range of 5 to 300 K, which is significantly higher than that of the bulk Fe (approximately 0.9 Oe). Through the annealing process...
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ژورنال
عنوان ژورنال: BMJ
سال: 2004
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.328.7439.574