In order to assess the thermal stability of polar ice deposits, we present model calculated temperatures of flat surfaces and surfaces within bowl-shaped and flat-floored polar impact craters on Mercury and the Moon. Our model includes appropriate insolation cycles, realistic crater shapes, multiple
The influence of CO ice on the activity and near-surface differentiation of comet nuclei
β Scribed by Fraser P. Fanale; James R. Salvail
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 855 KB
- Volume
- 84
- Category
- Article
- ISSN
- 0019-1035
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π SIMILAR VOLUMES
Kinetic equations are derived which describe the effect of thermal fluctuations upon tracer oxides on the surface of diffusion specimens. The rate of metal oxide reduction by such fluctuations is shown to be consistent with observations on the near-surface effect (NSE) of diffusion. In particular, t
The coadsorption of C,H, with Hz and CO on Pd(ll1) has been investigated at 300 and 330 K\_ At 300 2; two forms of adsorbed ethylene coexist on the surface in the presence of ethylene gas: a molecular iorm desorbing 3s C2 & at 330 K and a dissociatively adsorbed form (giving only hydrogen in dcsorpt