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The conversion from continuous time to samples (discrete-time) changes the underlying Fourier transform of () into a discrete-time Fourier transform (DTFT), which generally entails a type of distortion called aliasing. Choice of an appropriate sample-rate (see Nyquist rate) is the key to minimizing that distortion.
Between 1992 and 1997, all the locomotives were rebuilt as the DFT class, a turbocharged version of the DF. [ 1 ] The class should not be confused with the English Electric NZR D F class of 1954; as all of the old D F locomotives had been retired by mid-1975, the "DF" classification was free to be re-used.
The DFT is (or can be, through appropriate selection of scaling) a unitary transform, i.e., one that preserves energy. The appropriate choice of scaling to achieve unitarity is 1 / N {\displaystyle 1/{\sqrt {N}}} , so that the energy in the physical domain will be the same as the energy in the Fourier domain, i.e., to satisfy Parseval's theorem .
One can ask whether the DFT matrix is unitary over a finite field. If the matrix entries are over F q {\displaystyle F_{q}} , then one must ensure q {\displaystyle q} is a perfect square or extend to F q 2 {\displaystyle F_{q^{2}}} in order to define the order two automorphism x ↦ x q {\displaystyle x\mapsto x^{q}} .
The Mite-Lite is very minimalist lightweight trike, made from bolted-together aluminum tubing, with its single surface wing covered in Dacron sailcloth. Its wing is supported by a single tube-type kingpost and uses an "A" frame control bar. The wing is a large 205 sq ft (19.0 m 2) area and is suitable for power-off soaring flight. The aircraft ...
List of motorized trikes is a list of motorized tricycles also called trikes, and sometimes considered cars. There are three typical configurations: motorized bicycle with sidecar; two wheels in the rear, one in the front (aka trike); and two in front, one in the rear (aka reverse trike).