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 means ...
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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 geod ...
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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 ...
Bessel filter
In electronics and signal processing, a Bessel filter is a type of analog linear filter with a maximally flat Group delay and phase delay, group/phase delay (maximally linear phase response), which preserves the wave shape of filtered signals in ...
, a linear filter often used in audio crossover systems
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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
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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 ...
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Bessel (crater)
Bessel is a small Lunar craters, lunar impact crater that is located in the southern half of the Mare Serenitatis. The crater was named after the German astronomer Friedrich Wilhelm Bessel in 1935.Hankel transform
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Bessel window
In signal processing and statistics, a window function (also known as an apodization function or tapering function) is a mathematical function that is zero-valued outside of some chosen interval, normally symmetric around the middle of the inte ...
, in signal processing
* Besselian date, see Epoch (astronomy)#Besselian years
* , a German merchant ship in service 1928–45, latterly for the Kriegsmarine
People
* Friedrich Wilhelm Bessel (1784–1846), German mathematician, astronomer, and systematizer of the Bessel functions