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单词 occlusion
释义
occlusion

Physics
  • 1. The trapping of small pockets of liquid in a crystal during crystallization.

    2. The absorption of a gas by a solid such that atoms or molecules of the gas occupy interstitial positions in the solid lattice. Palladium, for example, can occlude hydrogen.


Chemistry
  • 1. The trapping of small pockets of liquid in a crystal during crystallization.

    2. The absorption of a gas by a solid such that atoms or molecules of the gas occupy interstitial positions in the solid lattice. Palladium, for example, can occlude hydrogen.


Geology and Earth Sciences
  • Stage in the development of a frontal depression during which the warm-sector air is gradually lifted from the surface and above the colder air. The word is used to describe an occluded front. An occlusion may be a ‘warm occlusion’ such that warmer air follows the frontal system, or a ‘cold occlusion’, such that colder air follows in the rear. A ‘warm occlusion’ has characteristics similar to those of a warm front, but there is an upper cold front ahead and aloft which brings showers from cumulus and cumulonimbus cloud. A ‘cold occlusion’ exhibits cold-front features, but is preceded by warm-front cloud types. Occlusions formed in the later stages in the development of travelling depressions commonly cross north-western Europe, especially the ‘warm’ type in winter and the ‘cold’ type in summer.


Geography
  • A stage in a mid-latitude depression where the cold front to the rear catches up with the leading warm front, lifts the wedge of warm air off the ground, and meets the cold air ahead of the warm front. If this overtaking air is colder than the cold air ahead of it, it will undercut it, forming a cold occlusion. If it is warmer than the cold air which is ahead of it, it will ride over it, in a warm occlusion. See B. Haurwitz (2007); see also Martin (1998) Month. Weather Revs 126, 2 and (1999) 127, 10; and Levizzani et al. (1989) Il nuovo cimento C 12, 2 (online), on a three-dimensional single radar analysis of an occluded front.

    Power and Sidaway (2005) Soc. & Cult. Geog. 6, 6 use the term occluded geographies in describing Lisbon's Expo '98 to signify a reworking/re-presentation.

    occlusion

    Occlusion


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