spectrum

名词 n.
中文释义

英文释义

名词 n.
  1. A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes.
    — Near-synonyms: sliding scale, continuum
  2. Specifically, a range of colours representing light (electromagnetic radiation) of contiguous frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc.
    — Current 3G technologies can send roughly 1 bit of data - a one or a zero - per second over each 1 Hz of spectrum that the operator owns.
  3. The autism spectrum. usually
    — He punctuated his words with a look into my eyes that might have been read as threatening or menacing by anyone who was not on the spectrum. But I am on the spectrum, and so I stared back at him.
  4. The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.).
  5. The set of eigenvalues of a matrix.
  6. Of a bounded linear operator A, the set of scalar values λ such that the operator A—λI, where I denotes the identity operator, does not have a bounded inverse; intended as a generalisation of the linear algebra sense.
  7. An abstract object in mathematics created from a commutative ring R and denoted operatorname Spec(R) or operatorname SpecR and said to be the spectrum of R; useful in the study of such rings for providing a geometric object which encodes many of the properties R, and in modern geometry for generalizing the notion of an algebraic variety to that of an affine scheme. Formally, the set of all prime ideals R equipped with the Zariski topology and augmented with a sheaf of rings called the structure sheaf, generated by the B-sheaf on the distinguished open sets D_f which assigns the localization of R at f to each set D_f, regarded as a ring of functions on D_f. See Spectrum of a ring on Wikipedia.Wikipedia
  8. Specter, apparition. obsolete
  9. The image of something seen that persists after the eyes are closed.

词形变化

spectra plural spectrums plural

词汇关系

衍生词
absorption spectrum autism spectrum autism spectrum disorder autistic spectrum autistic spectrum disorder autospectrum band spectrum bispectrum Bloch spectrum broad-spectrum broad-spectrum antibiotic cepstrum Eilenberg-MacLane spectrum emission spectrum fetal alcohol spectrum disorder first-order spectrum full-spectrum superiority full spectrum superiority hydrogen spectrum light spectrum line spectrum mass spectrum multispectrum narrow-spectrum nuclear spectrum on the spectrum optical spectrum political spectrum polyspectrum pseudospectrum schizophrenia spectrum Spec-chum spectro- spectrum analyser spectrum analyzer spectrum disorder spectrumy spread spectrum communication subspectrum trispectrum X-ray spectrum
相关词
spectral

词源

Etymology tree
Proto-Indo-European *speḱ-
Proto-Indo-European *-yeti
Proto-Indo-European *spéḱyeti
Proto-Italic *spekjō
Latin speciō
Proto-Indo-European *-tḗr
Proto-Indo-European *-trom
Proto-Italic *-trom
Latin -trum
Latin spectrumbor.
English spectrum
From Latin spectrum (“appearance, image, apparition”), from speciō (“look at, view”). Doublet of specter. See also scope.
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