| 释义 |
nucleˈation
[f. nucleate v.]
a. The formation of nuclei, esp. by the aggregation of molecules into a new phase within a medium.
b. The formation of something, esp. a crystal, droplet, or bubble, on or into a nucleus.
1861H. Macmillan Footn. fr. Nature 243 Giving rise either by gemmation or nucleation to new plants. 1902Science 31 Jan. 177/1 After nucleation the first dense fogs were vaguely annular during the first..exhaustions. 1906S. S. Laurie Synthetica I. iii. 39 A nucleation or involution or articulation or specific determination of Universal Being whereby an independent centre of actuality is constituted in rerum natura. 1906H. T. Barnes Ice Formation iv. 106 An appropriate term, nucleation, might be applied to the formation of ice-crystals throughout the volume of the water, on nuclei supplied by fine particles of sand. 1933H. G. Wells Shape of Things to Come ii. §3. 147 What we now call social nucleation was failing; the grouping of human beings in families and working communities was not going on. Ibid. 158 This chaotic nucleation of human beings about gangs and organizations for frankly criminal purposes. 1941Doan & Mahla Princ. Physical Metallurgy (ed. 2) vi. 224 In the transformation of a solid solution, such as austenite, the rate of nucleation is limited further by the rates of diffusion of the atoms forming the precipitate. 1950Engineering 13 Jan. 36/2 If the gas concentration is fairly low and the nucleation of bubbles difficult. 1966C. R. Tottle Sci. Engin. Materials vii. 167 In b.c.c. metals, some of which do show ductile failure, the nucleation of cavities occurs at piled-up dislocation sites. 1967A. H. Cottrell Introd. Metallurgy xii. 153 Many metallurgical processes occur by nucleation and growth, e.g. the formation of CO bubbles in a steel⁓making bath. Ibid. 154 When the probability of forming a nucleus is the same everywhere, the system is in a state suitable for homogeneous nucleation. |