| 词汇 | nucleation |
| 释义 | nucleation noun[ U ] science specializeduk /ˌnjuː.klɪˈeɪ.ʃən/ us /ˌnuː.klɪˈeɪ.ʃən/ the first step in the process of a substance changing from one state to another: 成核作用;晶核形成 This section deals with the simplest nucleation event, namely the nucleation of solid crystals during the freezing of a pure metal.本节讨论最简单的成核事件，即纯金属冻结过程中固体晶体的成核。 In the context of air pollution, nucleation initiates the process by which gases are converted to small liquid droplets.在空气污染方面，成核是气体转化为小液滴的过程。 Physical & chemical processes absorbable absorptive absorptive capacity absorptivity acidification endothermic reaction excitability excitation excite exergonic exothermic exothermic reaction impregnate reabsorb react reboil recondense redox scald vaporize Examples of nucleationnucleation These particles were prepared from molecular precursors combined with a surface modification agent either by a photolytic or a thermal nucleation and growth step. The presence of bulged grains indicates deformation at temperatures lower than those needed for subgrain nucleation. Nucleation of microtubules from mitotic centrosomes is modulated by a phosphorylated epitope. We have then no nucleation by the surface energy and a soup of matter. Therefore, at high strain rates, the strength is determined by both the interatomic forces and by growth and nucleation of cavities. Apparently, subtle variations in experimental conditions, such as the presence or absence of gentle agitation, can favor one nucleation event over others. It should be pointed out that the mechanism of fragmentation is closely related to a nucleation phenomenon. Such events can be handled by splitting the time interval into several parts (defined by time intervals between two nucleation or impingement events). In this way, the nucleation procedure we follow goes through a natural temporal and thermal evolution. While it is possible that the coalified surfaces acted as nucleation sites, the possibility that the spheres are organosilicates cannot be discounted. The capsule of host tissue surrounding them did not provide any barrier to ice nucleation. Here nucleation is the opposite of interface disappearance. However, little information is available on the microtubule nucleation ability of centrosomes of either male or female origin in maturing or pre-activated porcine oocytes. We assume that the volume fraction of crystals upon bubble nucleation is sufficiently high that the bubbles are prevented from subsequent buoyant motion. It is an up-to-date and comprehensive compilation of all aspects of igneous petrology, ranging from the nucleation and growth of crystals to magma genesis. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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