| 单词 |
mesic |
| 释义 |
▪ I. mesic, a.1 Ecology.|ˈmɛsɪk, ˈmiːsɪk|
[f. Gr. µέσ-ος middle + -ic.]
Having, or characterized by, a moderate amount of moisture.
1926[see hydric a.2]. 1967M. E. Hale Biol. Lichens vii. 91 The curves of frequency show the relative abundance of lichens in oak-dominated woods and their rarity..in mesic climax forests. 1974Environmental Conservation I. 60/1 A small tracked vehicle..was employed to establish a series of repetitive passes in a level mesic ‘meadow’.
▪ II. mesic, a.2 Nuclear Physics.|ˈmiːzɪk, ˈmɛzɪk|
[f. meson3 + -ic.]
Of, pertaining to, or being a meson; applied spec. to a system analogous to an atom in which a meson takes the place of either an orbital electron or the nucleus.
1939Physica VI. 877 ‘Mesic’ charges. 1952R. E. Marshak Meson Physics iv. 153 There are also selection rules for radiative and mesic absorption. 1956S. Tolansky Introd. Atomic Physics (ed. 4) xix. 328 Since mesons only exist virtually within unexcited nuclei and are only made free to exist alone by collision processes, there are no mesic atoms in normal unexcited materials. 1969Sci. Jrnl. July 44/1 The pion can be used to prepare mesic atoms in which a π- replaces an electron in the atom. 1972Physics Bull. Mar. 148/2 The meson then cascades down first by Auger transitions and, as it reaches lower orbits, increasingly by radiative transitions, emitting mesic x rays. |
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