| 单词 |
periodograph |
| 释义 |
periodograph|pɪərɪˈɒdəgrɑːf, -æ-|
[f. period n. + -o + -graph.]
1. A periodogram; orig. spec. a curve drawn in a periodogram.
1899A. Schuster in Trans. Cambr. Philos. Soc. XVIII. 108 With T as abscissa and S2 as ordinate, draw a curve, which may be called the ‘Periodograph’... It will be seen that the ‘Periodograph’ corresponds exactly to the curve which represents the distribution of energy in the spectrum. 1936Rev. Econ. Statistics XVIII. 63/2 Like the Fourier periodogram, this periodograph will show distinct peaks in the vicinity of real periodicities. 1950Conrad & Pollak Methods in Climatol. (ed. 2) xi. 370 The name ‘periodograph’ is no longer used and Schuster's ‘periodograph’ is now called a ‘periodogram’.
2. An instrument for automatically making a periodogram analysis or Fourier analysis of a curve by optical means.
1930G. A. R. Foster in Jrnl. Textile Inst. XXI. t18 The grating periodograph now described is an instrument which has been..designed for the examination of the irregularities in cotton spinning products... The periodograph is simply a method of carrying out automatically the periodogram analysis..of series of observations for hidden periodicities. 1946Suppl. Jrnl. R. Statistical Soc. VIII. 44 In the correlation periodograph, due to Martindale, the grating of the grating periodograph is replaced by a replica of the curve on a reduced scale. 1973Physics Bull. Mar. 154/2 The ‘Periodograph’ was never applied to the analysis of electron micrographs until Warren (1972) had the ingenious idea of replacing the grating by a series of point sources such as flashlamp bulbs and interposing a micrograph between the bulbs and the final screen. |
英语词典包含277258条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。
相关内容：
相关热词搜索：periodograph英英词典英英释义英语词汇意思用法释义英语
单词 visitor 释义 visitor n ~ (to sb/sth) (from sb/sth) 1 (a) one who visits a person or p......