Bessel may refer to: *

Bessel beam A Bessel beam is a wave whose amplitude is described by a Bessel function of the first kind. Electromagnetic, acoustic, gravitational, and matter waves can all be in the form of Bessel beams. A true Bessel beam is non-diffractive. This mean ...

Bessel ellipsoid The Bessel ellipsoid (or Bessel 1841) is an important reference ellipsoid of geodesy. It is currently used by several countries for their national geodetic surveys, but will be replaced in the next decades by modern ellipsoids of satellite geode ...

Bessel function Bessel functions, first defined by the mathematician Daniel Bernoulli and then generalized by Friedrich Bessel, are canonical solutions of Bessel's differential equation x^2 \frac + x \frac + \left(x^2 - \alpha^2 \right)y = 0 for an arbitrary ...

in mathematics *

Bessel's inequality In mathematics, especially functional analysis, Bessel's inequality is a statement about the coefficients of an element x in a Hilbert space with respect to an orthonormal sequence. The inequality was derived by F.W. Bessel in 1828. Let H be a H ...

in mathematics *

Bessel's correction In statistics, Bessel's correction is the use of ''n'' − 1 instead of ''n'' in the formula for the sample variance and sample standard deviation, where ''n'' is the number of observations in a sample. This method corrects the bias i ...

in statistics. *

Bessel filter In electronics and signal processing, a Bessel filter is a type of analog linear filter with a maximally flat group/phase delay (maximally linear phase response), which preserves the wave shape of filtered signals in the passband. Bessel filter ...

, a linear filter often used in audio crossover systems *

Bessel Fjord Bessel Fjord is a fjord in northeastern Greenland. Administratively it belongs to the NE Greenland National Park area. History The area around the mouth of this fjord was referred to as "Bessel Bay" at the time of the 1869–70 Second German Nor ...

, NE Greenland *

Bessel Fjord, NW Greenland Bessel Fjord ( da, Bessels Fjord) is a fjord in northwestern Greenland. Administratively it belongs to the Avannaata municipality. Knud Rasmussen described the fjord entrance in the following terms: Geography Bessel Fjord stretches roughly from ...

* Bessel (crater), a small lunar crater * Bessel transform, also known as Fourier-Bessel transform or

Hankel transform In mathematics, the Hankel transform expresses any given function ''f''(''r'') as the weighted sum of an infinite number of Bessel functions of the first kind . The Bessel functions in the sum are all of the same order ν, but differ in a scalin ...

* Bessel window, in signal processing * Besselian date, see Epoch (astronomy)#Besselian years * , a German merchant ship in service 1928–45, latterly for the Kriegsmarine

People

Friedrich Bessel Friedrich Wilhelm Bessel (; 22 July 1784 – 17 March 1846) was a German astronomer, mathematician, physicist, and geodesist. He was the first astronomer who determined reliable values for the distance from the sun to another star by the met ...

(1784–1846), German mathematician, astronomer, and systematizer of the Bessel functions *

Bessel Kok Bessel Kok (born 13 December 1941 in Hilversum, Netherlands) is a Dutch businessman and chess organiser living in Prague. He has served in top management positions in telecommunications companies in Belgium (Belgacom) and in the Czech Republic. He ...

(born 1941), Dutch businessman and chess organiser

People

See also