directivity

名词 n.
中文释义

英文释义

名词 n.
  1. A measure of the performance of an antenna compared to an isotropic antenna; the ratio of the maximum value of radiation intensity to the average radiation intensity. countable,uncountable
  2. Anisotropy in the propagation of earthquake waves in the direction of rupture. countable,uncountable
  3. Directionality countable,rare,uncountable
    — 1991, COSPAR. Plenary Meeting, Jean-Louis Fellous, COSPAR., Global change and relevant space observations: proceedings of Symposium 1 of the COSPAR twenty-eighth Plenary Meeting held in The Hague, the Netherlands, 25 June-6 July 1990, Pergamon For higher degrees, the spatial integration tends to produce a cancellation and a rapid loss of visibility, although less rapidly for velocity measurement than for luminosity measurement, on account of the directivity of the velocity vector.

词形变化

directivities plural

词汇关系

相关词
directability dirigibility

词源

Etymology tree
English directive
Proto-Indo-European *-teh₂
Proto-Indo-European *-ts
Proto-Indo-European *-teh₂ts
Latin -itāsder.
Old French -itebor.
Middle English -ite
English -ity
English directivity
From directive + -ity.
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