Zobrazeno 1 - 10
of 70
pro vyhledávání: '"Brauer, F. P."'
We investigate the time evolution of disease spread on a network by using the concept of generations. We derive a set of equations, which can be used to determine the average epidemic size. We find a very good agreement between the analytical and sim
Externí odkaz:
http://arxiv.org/abs/1005.4047
Context. Current models of the size- and radial evolution of dust in protoplanetary disks generally oversimplify either the radial evolution of the disk (by focussing at one single radius or by using steady state disk models) or they assume particle
Externí odkaz:
http://arxiv.org/abs/1002.0335
Publikováno v:
A&A 503, L5-L8 (2009)
Context: Protoplanetary disks are observed to remain dust-rich for up to several million years. Theoretical modeling, on the other hand, raises several questions. Firstly, dust coagulation occurs so rapidly, that if the small dust grains are not repl
Externí odkaz:
http://arxiv.org/abs/0907.0985
The formation of planetesimals in protoplanetary disks due to collisional sticking of smaller dust aggregates has to face at least two severe obstacles, namely the rapid loss of material due to radial inward drift and particle fragmentation due to de
Externí odkaz:
http://arxiv.org/abs/0806.1646
The growth of solid particles towards meter sizes in protoplanetary disks has to circumvent at least two hurdles, namely the rapid loss of material due to radial drift and particle fragmentation due to destructive collisions. In this paper, we presen
Externí odkaz:
http://arxiv.org/abs/0711.2192
Millimeter interferometry provides evidence for the presence of mm to cm size "pebbles" in the outer parts of disks around pre-main-sequence stars. The observations suggest that large grains are produced relatively early in disk evolution (< 1 Myr) a
Externí odkaz:
http://arxiv.org/abs/0704.2332
Akademický článek
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Publikováno v:
Astronomy and Astrophysics; August 2008, Vol. 487 Issue: 1 pL1-L4, 4p
Publikováno v:
Astronomy and Astrophysics; March 2008, Vol. 480 Issue: 3 p859-877, 19p
Akademický článek
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