Discrete Fourier Transform
Mostrando 13-23 de 23 artigos, teses e dissertações.
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13. Modelos prognósticos da temperatura mínima média numa região homogênea do Rio Grande do Sul / Prognostics nodels of minimum mean temperatures in a homogeneous region of Rio Grande do Sul
This work aims to study the minima mean monthly temperatures behave in RS state, Brazil, in 90 years (1913 2002) of observation. The data were cllected in 40 meteorological station distributed in the state, and the faults were completed by the correlation method. On the first step, five regions were determinated by Cluster Analysis, these regions present sim
Publicado em: 2005
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14. DTMF decoding via arithmetic Fourier transform / DecodificaÃÃo de sinais DTMF via transformada aritmÃtica de Fourier
Dual-Tone Multifrequency (DTMF) signalling has manifold applications and has been used in a broad range of modern Telecommunication systems, such as, for instance, telephony, voice mail, e-commerce, and interactive home banking. Due to the ever increasing demand for higher transmission rates in this scenario, the fast decoding of a DTMF signal becomes a high
Publicado em: 2004
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15. Vibroacoustic vharacterization using nearfield acoustic holography / Caracterização vibroacustica usando holografia acustica de campo proximo
In this work, the Nearfield Acoustic Holography technique - NAH was explored as an way to analyze vibroacoustic problems. Holography is a process that allows to determine acoustic fields characteristics using a Discrete Fourier Transform - DFT, from a regular grid of measurements obtained in an acoustic environment for which the Green s function is known. Th
Publicado em: 1999
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16. On computing the Discrete Fourier Transform
New algorithms for computing the Discrete Fourier Transform of n points are described. For n in the range of a few tens to a few thousands these algorithms use substantially fewer multiplications than the best algorithm previously known, and about the same number of additions.
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17. Discrete and integral fourier transforms: analytical examples.
Analytical examples of the discrete Fourier transform (DFT) help in understanding relations between the DFT and the Fourier integral transform (FIT). Such examples enable one to estimate the errors involved when one transform is approximated by the other, and they suggest how such approximation errors might be reduced. We present mathematical and numerical a
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18. Fourier analysis on the Heisenberg group
We obtain a usable characterization of the (group) Fourier transform of 𝒮(Hn) (Schwartz space on the Heisenberg group). The characterization involves writing elements of [Formula: see text] as asymptotic series in Planck's constant. In the process, we derive a new “discrete” version of spherical harmonics, and elucidate the theory of group contraction
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19. Rapid Differentiation of Closely Related Candida Species and Strains by Pyrolysis-Mass Spectrometry and Fourier Transform-Infrared Spectroscopy
Two rapid spectroscopic approaches for whole-organism fingerprinting of pyrolysis-mass spectrometry (PyMS) and Fourier transform-infrared spectroscopy (FT-IR) were used to analyze a group of 29 clinical and reference Candida isolates. These strains had been identified by conventional means as belonging to one of the three species Candida albicans, C. dublini
American Society for Microbiology.
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20. Does the maximum entropy method improve sensitivity?
Maximum entropy reconstruction has been used in several fields to produce visually striking reconstructions of positive objects (images, densities, spectra) from noisy, indirect measurements. In magnetic resonance spectroscopy, this technique is notable for its apparent noise suppression and its avoidance of the artifacts that affect discrete Fourier transfo
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21. Random walks with self-similar clusters
We construct a random walk on a lattice having a hierarchy of self-similar clusters built into the distribution function of allowed jumps. The random walk is a discrete analog of a Lévy flight and coincides with the Lévy flight in the continum limit. The Fourier transform of the jump distribution function is the continuous nondifferentiable function of Wei
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22. Gene Prediction by Spectral Rotation Measure: A New Method for Identifying Protein-Coding Regions
A new measure for gene prediction in eukaryotes is presented. The measure is based on the Discrete Fourier Transform (DFT) phase at a frequency of 1/3, computed for the four binary sequences for A, T, C, and G. Analysis of all the experimental genes of S. cerevisiae revealed distribution of the phase in a bell-like curve around a central value, in all fo
Cold Spring Harbor Laboratory Press.
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23. Isotropic periodic sum of electrostatic interactions for polar systems
Isotropic periodic sum (IPS) is a method to calculate long-range interactions based on homogeneity of simulation systems. Long-range interactions are represented by interactions with isotropic periodic images of a defined local region and can be reduced to short ranged IPS potentials. The original electrostatic three-dimensional (3D)-IPS potential was derive
American Institute of Physics.