Results 31 to 40 of about 8,064,980 (248)
CLATHRATE HYDRATES FORMATION IN SHORT-PERIOD COMETS
The Astrophysical Journal, 2009 The initial composition of current models of cometary nuclei is only based on two forms of ice: crystalline ice for long-period comets and amorphous ice for short-period comets. A third form of ice, i.e., clathrate hydrate, could exist within the short-period cometary nuclei, but the area of formation of this crystalline structure in these objects has ...
Marboeuf, Ulysse +3 more
openaire +4 more sources
Activity of 50 Long-Period Comets Beyond 5.2 AU [PDF]
, 2016 Remote investigations of the ancient solar system matter has been traditionally carried out through the observations of long-period (LP) comets that are less affected by solar irradiation than the short-period counterparts orbiting much closer to the Sun.
Kelemen, János +25 more
core +1 more source
Long Dust Trails of Short Period Comets [PDF]
International Astronomical Union Colloquium, 1991 Comets constitute an important source for the zodiacal dust cloud. Mainly large particles are contributed because the smaller particles are emitted into hyperbolic orbits relative to the sun. Radiation pressure force reduces the effective solar gravitational attraction. Information about large cometary particles can be derived from a variety of sources
H. U. Keller, K. Richter
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The Astrophysical Journal Supplement SeriesWe present the first results from the Cometary Object Study Investigating their Nature and Evolution (COSINE) project, based on a uniformly processed data set of 484 comets observed over the full 15 yr duration of the Wide-field Infrared Survey Explorer (
Yuna G. Kwon +10 more
doaj +1 more source
SOHO/SWAN Observations of Short-period Spacecraft Target Comets [PDF]
, 2011 SWAN, the Solar Wind ANisotropies all-sky hydrogen Ly_ camera on the Solar and Heliospheric Observatory spacecraft that makes all-sky images of interplanetary neutral hydrogen, has an ongoing campaign to make special observations of comets, both short ...
Lee, Y. +13 more
core +1 more source
Advanced Science, EarlyView.A recycling approach of spent lithium‐ion batteries is developed using brewing wastewater as the leaching agent and an engineering microbial consortium as the biocatalyst. Shewanella oneidensis reduces spent LiNixCoyMn1‐x‐yO2 cathodes via extracellular electron transfer, while Bacillus subtilis removes residual ethanol to eliminate inhibition.
Baocai Zhang +14 more
wiley +1 more source
Small-body encounters using solar sail propulsion [PDF]
, 2004 Cometary Rendezvous and Flybys have large V requirements, which impose almost unattainable, and sometimes prohibitive, demands on the propellant budget of conventional, chemical propulsion.
Hughes, Gareth W., McInnes, Colin R.
core +3 more sources
The activity characteristics and mechanisms of long-period comets
Earth and Planetary PhysicsComets are small celestial bodies orbiting around the Sun. They are remnants left over from the formation of the solar system; their interiors store original material of the planetary disk within the solar system. They are thus "fossils" for studying the
YingQi Wu +3 more
doaj +1 more source
The long-term dynamical behavior of short-period comets [PDF]
, 1993 The orbits of the known short-period comets under the influence of the Sun and all the planets except Mercury and Pluto are numerically integrated. The calculation was undertaken in order to determine the dynamical lifetimes for these objects as well as ...
Levison, Harold F., Duncan, Martin J.
core
Advanced Science, EarlyView.DDX21 suppresses MK2 activation by directly inhibiting Thr334 phosphorylation in a p38‐independent manner, thereby impairing DNA damage response. Clinically, patients with well‐differentiated tumors exhibiting high DDX21 expression are more likely to benefit from adjuvant radiotherapy, whereas those with low DDX21 levels are predisposed to ...
Tianru Yang +8 more
wiley +1 more source