Results 41 to 50 of about 1,139,003 (330)

Steerable Discrete Fourier Transform

, 2017
Directional transforms have recently raised a lot of interest thanks to their numerous applications in signal compression and analysis. In this letter, we introduce a generalization of the discrete Fourier transform, called steerable DFT (SDFT).
Fracastoro, Giulia, Magli, Enrico
core   +1 more source

A Study on the Number of Neutrosophic Crisp Topological Spaces in a Finite Set [PDF]

Neutrosophic Sets and Systems
Fourier transform is one of the oldest and well-known technique in the field of mathematics and engineering mathematical works. As the concept of uncertainty has been introduced in the mathematics, most of the works gravitate towards the use Neutrosophic
Jili Basumatary, Bhimraj Basumatary
doaj   +1 more source

Some remarks on the visible points of a lattice [PDF]

, 1994
We comment on the set of visible points of a lattice and its Fourier transform, thus continuing and generalizing previous work by Schroeder and Mosseri. A closed formula in terms of Dirichlet series is obtained for the Bragg part of the Fourier transform.
Abramowitz M, Apostol T M, Apostol T M, Apéry R, Beukers F, D H Warrington, Hardy G H, M Baake, Mosseri R, Odlyzko A M, Schroeder M R, Schroeder M R, Siegel C L, Titchmarsh E C, U Grimm   +14 more
core   +3 more sources

Hands‐on protocol for preparing water‐soluble fractions from agri‐food samples for NMR‐based metabolomics analysis

FEBS Open Bio, EarlyView.
This research protocol outlines a workflow for nuclear magnetic resonance (NMR)‐based metabolomics in the agri‐food sector. Using two case studies—strawberry leaves (solid matrix) and wine (liquid matrix)—it details the procedures for sample preparation, data acquisition, and processing.
Andrea Fernández‐Veloso, Jaime Hiniesta‐Valero, Alejandra Guerra‐Castellano, Miguel A. De la Rosa, Irene Díaz‐Moreno   +4 more
wiley   +1 more source

Phase-controlled Fourier-transform spectroscopy

Nature Communications, 2018
Fourier transform spectrometers are generally limited to slow scanning rates at high resolution. Here the authors demonstrate highly efficient Fourier transform spectroscopy using a dynamic phase-control technique that enables fast acquisition without ...
Kazuki Hashimoto, Takuro Ideguchi
doaj   +1 more source

Holomorphic harmonic analysis on complex reductive groups

, 2007
We define the holomorphic Fourier transform of holomorphic functions on complex reductive groups, prove some properties like the Fourier inversion formula, and give some applications.
An, Jinpeng, Qian, Min, Wang, Zhengdong
core   +1 more source

Relating the Lorentzian and exponential: Fermi's approximation,the Fourier transform and causality [PDF]

, 2002
The Fourier transform is often used to connect the Lorentzian energy distribution for resonance scattering to the exponential time dependence for decaying states.
A. Bohm, A. Bohm, A. Bohm, A. Bohm, A. Bohm, Arno R. Bohm, C.F. Bharucha, C.W. Oates, E. Fermi, E. Roberts, E.P. Wigner, G. Gamow, G.C. Hegerfeldt, G.W. King, H. Jakobvits, H. Primakoff, H. Walther, H.W. Atherton, J.P. Antoine, J.P. Antoine, L. Fonda, L.A. Khalfin, L.A. Khalfin, M. Gadella, M. Levy, M.H. Stone, N. L. Harshman, O. Civitarese, R.P. Feynman, S.R. Wilkinson, U. Volz, V. Weisskopf, V. Weisskopf   +32 more
core   +2 more sources

Antibiofilm activity of a chionodracine‐derived peptide by NMR‐based metabolomics of cell‐free supernatant of Acinetobacter baumannii clinical strains

FEBS Open Bio, EarlyView.
KHS‐Cnd peptide is able to impair biofilm formation and disaggregate mature biofilms in Acinetobacter baumannii clinical isolates. Differences in extracellular metabolites reflect changes in biofilm metabolism due to KHS‐Cnd treatment. Among the differentially represented extracellular metabolites upon KHS‐Cnd treatment, the significantly altered ...
Fernando Porcelli, Enrico Landi, Francesco Maiurano, Irene Paris, Rosanna Papa, Marco Artini, Laura Selan, Stefano Borocci, Francesco Buonocore, Esther Imperlini   +9 more
wiley   +1 more source

A Fourier transform differentiator operator

Results in Physics
By utilizing the Fourier transform, we present a practical method for evaluating a function of a derivative applied to any other arbitrary function of a single complex variable.
Blanca L. Moreno-Ley, Jorge A. Anaya-Contreras, Arturo Zúñiga-Segundo, Héctor M. Moya-Cessa   +3 more
doaj   +1 more source

Reviews of bearing vibration measurement using fast Fourier transform and enhanced fast Fourier transform algorithms

Advances in Mechanical Engineering, 2019
The rolling element bearing is one of the most critical components in a machine. Vibration signals resulting from these bearings imply important bearing defect information related to the machinery faults.
Hsiung-Cheng Lin, Yu-Chen Ye
doaj   +1 more source