| 释义 |
discontinuity
dis·con·ti·nu·i·ty D0259000 (dĭs-kŏn′tə-no͞o′ĭ-tē, -nyo͞o′-)n. pl. dis·con·ti·nu·i·ties 1. Lack of continuity, logical sequence, or cohesion.2. A break or gap.3. Geology A surface at which seismic wave velocities change.4. Mathematics a. A point at which a function is defined but is not continuous.b. A point at which a function is undefined.discontinuity (dɪsˌkɒntɪˈnjuːɪtɪ) n, pl -ties1. lack of rational connection or cohesion2. a break or interruption3. (Mathematics) maths a. the property of being discontinuousb. the point or the value of the variable at which a curve or function becomes discontinuous4. (Geological Science) geology a. a zone within the earth where a sudden change in physical properties, such as the velocity of earthquake waves, occurs. Such a zone marks the boundary between the different layers of the earth, as between the core and mantle. See also Mohorovičić discontinuityb. a surface separating rocks that are not continuous with each otherdis•con•ti•nu•i•ty (ˌdɪs kɒn tnˈu ɪ ti, -ˈyu-)
n., pl. -ties. 1. lack of continuity; irregularity. 2. a break or gap. 3. a point at which a mathematical function is not continuous. [1560–70; < Medieval Latin] Discontinuity lose the thread To lose one’s train of thought in a discussion; to have the continuity of one’s thoughts or words interrupted. Thread in this phrase is the central thought connecting successive points, a continuous flow which is carried on in spite of digressions or interruptions. This figurative use of thread dates from the mid-17th century. We laughed so violently … that he could not recover the thread of his harangue. (Frances Burney, Diary and Letters, 1782) side-track To diverge from the main subject, course, or road; to go off on a tangent; to shelve or otherwise delay consideration of some matter. Literally, to side-track means to shunt a train onto a siding, off the main track, hence its figurative implications. The business of the minister is to preach the gospel, not … to side-track on great moral issues. (Advance [Chicago, Illinois], June, 1893) A related expression which also employs railroad terminology is off the track. table In U.S. parliamentary procedure this verb means to ‘postpone action on’: The amendment which was always present, which was rejected and tabled and postponed. (The Century XXXVII, 1873) In British parliamentary procedure, it means to ‘present for discussion’: If any more “Old Residents” wish to be heard, they must table their names. (Pall Mall Gazette, Jan. 3, 1887) This is a confusing state of affairs and must be watched carefully by those encountering the term in what may be foreign contexts. discontinuityA zone that marks a boundary between different layers of the Earth, such as between the mantle and the core, and where the velocity of seismic waves changes.Thesaurus| Noun | 1. | discontinuity - lack of connection or continuityseparation - the state of lacking unitycontinuity - uninterrupted connection or union |
discontinuitynoun lack of unity, disconnection, incoherence, disunion, lack of coherence, disjointedness, disconnectedness The text suffers from discontinuity.discontinuitynounA cessation of continuity or regularity:break, discontinuance, discontinuation, disruption, interruption, pause, suspension.TranslationsασυνέχειαdiscontinuitédiscontinuitàinterruzioneDiscontinuity
discontinuity[dis‚känt·ən′ü·əd·ē] (electromagnetism) An abrupt change in the shape of a waveguide. Also known as waveguide discontinuity. (geology) An interruption in sedimentation. A surface that separates unrelated groups of rocks. (geophysics) A boundary at which the velocity of seismic waves changes abruptly. (mathematics) A point at which a function is not continuous. (metallurgy) The place where the structural nature of a weldment is interfered with because of the materials involved or where the mechanical, physical, or metallurgical aspects are not homogeneous. (physics) A break in the continuity of a medium or material at which a reflection of wave energy can occur. Discontinuity (or point of discontinuity), a value of the argument at which the continuity of a function is violated. In the simplest case, continuity is violated at some point a in the sense that the right and left limits 
exist, but at least one of them differs from f(a). When this occurs, a is called a jump discontinuity of f, or the discontinuity of the first kind. If f(a + 0) = f(a – 0), the discontinuity is said to be removable, since f(x) becomes continuous at a if we set f(a) = f(a + 0) = f(a – 0). For example, the point a = 0 is a removable discontinuity of the function 
since f is continuous at 0, if we set f(0) = 1. If, however, the jump δ = f(a + 0) – f(a – 0) of the function f(x) at the point is nonzero, then a is a discontinuity for any definition of the value of f(a). An example of such a discontinuity is the point a = 0 for the function f(x)= arc tan 1/x. In this case, the function may not be defined at the point a. The jump discontinuity is called regular if the condition f(a) = ½[f(a – 0) + f(a + 0)] is satisfied. If either of the one-side limits does not exist, then the point a is called the discontinuity point of the second kind. Examples are the point a = 2 for the function f(x) = 1/(x – 2) and the point a = 0 for f(x) = sin 1/x. discontinuity
discontinuity - the occurrence of a species in two or more geographically separated areas.
- a layer separating two discrete areas; for example, a THERMOCLINE.
discontinuity
Related to discontinuity: MohoroviCiC discontinuity, discontinuity theorySynonyms for discontinuitynoun lack of unitySynonyms- lack of unity
- disconnection
- incoherence
- disunion
- lack of coherence
- disjointedness
- disconnectedness
Synonyms for discontinuitynoun a cessation of continuity or regularitySynonyms- break
- discontinuance
- discontinuation
- disruption
- interruption
- pause
- suspension
Antonyms for discontinuitynoun lack of connection or continuityRelated WordsAntonyms |