fractionation

n. 分别, 分馏法 [化] 分级; 分馏; 分凝

词形变化

fractionations 复数 fractionations

释义与例句

n.
  1. 1.

    A separation process in which a certain quantity of a mixture is divided up into smaller quantities (fractions) in which the composition changes according to a gradient; an instance of this process.

    可数 不可数 化学

    Methane is separated from other hydrocarbons in a gas fractionation plant.

    After several fractionations, we had a usable product.

  2. 2.

    The division of a total dose of radiation into fractions.

    可数 不可数
  3. 3.

    A preliminary stage of encryption that divides each plaintext symbol into several ciphertext symbols.

    可数 不可数 计算机 工程 数学
  4. 4.

    A form of hypnosis where the patient is made to enter and leave a trance state many times in quick succession.

    可数 不可数

词汇关系

名词

上位词 1

division

下位词 2

destructive distillation fractional distillation

词源

By surface analysis, fraction + -ation, or, by surface analysis, fractionate + -ion.

来源：wiktionary