| 单词 |
albedo |
| 释义 |
‖ albedo|ælˈbiːdəʊ|
[L. albēdo whiteness; f. alb-um white.]
1. Whiteness; spec. in Astr. The proportion of the solar light incident upon an element of the surface of a planet, which is again diffusedly reflected from it. Hence in extended use, applied to the proportion of light reflected from various surfaces. Also attrib.
1859Monthly Not. R.A.S. XX. 103. 1878 Newcomb Pop. Astron. 549 When the albedo of a body is said to be 0·6. 1879Syd. Soc. Lex. s.v., Urinary conditions..were called the crystalline, the snowy, the limy, and the limpid albedo. 1936Brit. Jrnl. Psychol. Jan. 313 Experiments on albedo perception. 1936Nature 11 July 70/1 The albedo of different types of soil and vegetation. 1937Jrnl. R. Aeronaut. Soc. XLI. 410 The albedo of clouds and the earth's surface.
2. A white structure, tissue, or material (Webster 1934); spec. the white pith of the inner peel of citrus fruits.
1949J. B. S. Braverman Citrus Products iii. 77 Penetrating further into the peel of citrus fruit, one comes to the white, spongy, parenchymatous layer (mesocarp), generally known as the albedo.
3. Nuclear Physics. (See quots.)
1949W. E. Siri Isotopic Tracers v. 134 The effect of a reflector..is expressed in terms of its albedo γ, defined as the ratio of the number of neutrons that flow back in across the boundary to the number that flow out. 1962Gloss. Terms Nucl. Sci. (B.S.I.) 8 Albedo, of a given object, the fraction of radiation (e.g. slow neutrons) reflected from it (Symbol: β). |
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