| 释义 |
Bessel|ˈbɛsəl|
The surname of F. W. Bessel (1784–1846), a German astronomer, used attrib. or in the possessive in Bessel('s) function: a solution of Bessel's differential equation x2 d2y / dx2 + x dy / dx + ⎜x2 - n2⎟ y = 0 So Beˈsselian a. (Cent. Dict., 1889).
1872Phil. Mag. XLIV. 328 The value of Bessel's functions is becoming generally recognized. 1894Ann. Math. IX. 27 (heading) Roots of the Second Bessel Function. 1939Nature 22 July 162/2 Results calculated..by the Besselian method. 1963G. Troup Masers & Lasers (ed. 2) vii. 117 The cut-off parameters uomfor these modes are the mth roots of the zero order Bessel function Jo. |