| 单词 | point source |
| 释义 | > as lemmaspoint source point source n. (a) a source (as of light or sound) having negligible dimensions, or considered as a mathematical point; (b) Ecology a source of pollution that can be traced to a single location or small area. ΘΚΠ the world > matter > physics > energy or power of doing work > [noun] > source of energy or power > of negligible dimensions point source1894 the world > matter > physics > electromagnetic radiation > light > emission of light, radiation > [noun] > point from which rays proceed radiant point1665 focus1704 focal point1713 radiant1728 radiator1811 point source1894 1894 Philos. Trans. 1893 (Royal Soc.) A. 184 738 Consider now a fixed point-source in a uniformly moving medium. 1949 W. E. Siri Isotopic Tracers xiii. 375 The angular distribution of beta particles from a point source of small mass is isotopic. 1971 I. G. Gass et al. Understanding Earth xiii. 178 Contrast this with a deep ocean floor, lacking in relief, and far from any strong point-sources of debris. 1992 S. P. Maran Astron. & Astrophysics Encycl. 748/1 Type II OH/IR objects are strong maser sources with the 1612-MHz satellite line of OH amplified, and are associated with infrared point sources. 2001 Chesapeake Bay Mag. Oct. 88/1 In the Severn, ravines feed the creeks much more than point sources (sewage treatment plants and factories, for example). < as lemmas |
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