(dft)
91Molecular dynamics — (MD) is a computer simulation of physical movements of atoms and molecules. The atoms and molecules are allowed to interact for a period of time, giving a view of the motion of the atoms. In the most common version, the trajectories of molecules… …
92Rader's FFT algorithm — Rader s algorithm (1968) is a fast Fourier transform (FFT) algorithm that computes the discrete Fourier transform (DFT) of prime sizes by re expressing the DFT as a cyclic convolution. (The other algorithm for FFTs of prime sizes, Bluestein s… …
93Prime-factor FFT algorithm — The Prime factor algorithm (PFA), also called the Good Thomas algorithm (1958/1963), is a fast Fourier transform (FFT) algorithm that re expresses the discrete Fourier transform (DFT) of a size N = N 1 N 2 as a two dimensional N 1 times; N 2 DFT …
94Bruun's FFT algorithm — Bruun s algorithm is a fast Fourier transform (FFT) algorithm based on an unusual recursive polynomial factorization approach, proposed for powers of two by G. Bruun in 1978 and generalized to arbitrary even composite sizes by H. Murakami in 1996 …
95Discrete-time Fourier transform — In mathematics, the discrete time Fourier transform (DTFT) is one of the specific forms of Fourier analysis. As such, it transforms one function into another, which is called the frequency domain representation, or simply the DTFT , of the… …
96Time-dependent density functional theory — (TDDFT) is a quantum mechanical method used inphysics and chemistry to investigate the proprieties of many body systems beyond the ground statestructure. It s an extension of density functional theory (DFT) to the time dependent domain asa method …
97Road signs in the United Kingdom — conform broadly to European norms, though a number of signs are unique to Britain and direction signs omit European route numbers. The system currently in use was developed in the late 1950s and the early 1960s by the Anderson Committee, which… …
98Car accident — A car accident is a road traffic incident which usually involves one road vehicle colliding with, either another vehicle, another road user, or a stationary roadside object, and which may result in injury or property damage. Terminology Phrases… …
99Roads in the United Kingdom — The A2 at Leyton Cross, Dartford. Roads in the United Kingdom form a network of varied quality and capacity. Road distances are shown in miles or yards and UK speed limits are in miles per hour (mph) or use of the national speed limit (NSL)… …
100Weltraumturm — Ein Weltraumturm ist ein Turm auf der Erde oder einem anderen Himmelskörper, der so hoch ist, dass von seiner Spitze der Orbit vergleichsweise einfach erreicht werden kann. Bisher ist kein solcher Turm errichtet worden. Auf der Erde muss die… …
