Results 51 to 60 of about 306,865 (270)
Type-IV DCT, DST, and MDCT algorithms with reduced numbers of arithmetic operations
, 2009 We present algorithms for the type-IV discrete cosine transform (DCT-IV) and discrete sine transform (DST-IV), as well as for the modified discrete cosine transform (MDCT) and its inverse, that achieve a lower count of real multiplications and additions ...
Arai +52 more
core +3 more sources
Advanced Functional Materials, EarlyView.Zinc(II) coordination complexes with tunable aryloxy‐imine ligands exhibit controllable supramolecular self‐assembly into hierarchical fibrous structures. Coordination‐driven stacking, not π–π interactions, enables gelation, dynamic assembly/disassembly, and enhanced nanomechanical properties.
Merlin R. Stühler +10 more
wiley +1 more source
Localization Operators and an Uncertainty Principle for the Discrete Short Time Fourier Transform
Abstract and Applied Analysis, 2014 Localization operators in the discrete setting are used to obtain information on a signal f from the knowledge on the support of its short time Fourier transform.
Carmen Fernández +2 more
doaj +1 more source
Discrete Fourier transform as a basis for steganographic method
Trudy Odesskogo Politehničeskogo Universiteta, 2014 Actuality of developing of new steganographic methods doesn’t cause doubts due to the rapid development of information technologies and considerable minuses of existing steganomethods.
Maria O. Kozina
doaj +1 more source
Fast Radix-32 Approximate DFTs for 1024-Beam Digital RF Beamforming
IEEE Access, 2020 The discrete Fourier transform (DFT) is widely employed for multi-beam digital beamforming. The DFT can be efficiently implemented through the use of fast Fourier transform (FFT) algorithms, thus reducing chip area, power consumption, processing time ...
Arjuna Madanayake +8 more
doaj +1 more source
Fast‐Responding O2 Gas Sensor Based on Luminescent Europium Metal‐Organic Frameworks (MOF‐76)
Advanced Functional Materials, EarlyView.Luminescent MOF‐76 materials based on Eu(III) and mixed Eu(III)/Y(III) show rapid and reversible changes in emission intensity in response to O2 with very short response times. The effect is based on triplet quenching of the linker ligands that act as photosensitizers. Average emission lifetimes of a few milliseconds turn out to be mostly unaffected by
Zhenyu Zhao +5 more
wiley +1 more source
Implementation of quantum and classical discrete fractional Fourier transforms
Nature Communications, 2016 Fourier analysis has become a standard tool in contemporary science. Here, Weimann et al. report classical and quantum optical realizations of the discrete fractional Fourier transform, a generalization of the Fourier transform, with potential ...
Steffen Weimann +11 more
doaj +1 more source
Detection of Hidden Object In Speech Based on Fast Fourier Transform Algorithm [PDF]
Engineering and Technology Journal, 2011 In this paper steganalysis technique is proposed on the basis of spectral domain analysis using Discrete Fourier Transform, Fast Fourier Transform Algorithm (DFT_FFTA).
Mahmud k. Kadum
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Advanced Functional Materials, EarlyView.This study presents a new hole transporting material (HTM) mechanism for self‐assembled monolayers in near‐infrared organic photodetectors. The formation of zwitterions induces a strong electric field that significantly increases the work function of HTM‐coated indium tin oxide substrates. The devices exhibit low dark current and noise, along with high
Jiyoung Shin +9 more
wiley +1 more source
Discrete Two-Dimensional Fourier Transform in Polar Coordinates Part I: Theory and Operational Rules
Mathematics, 2019 The theory of the continuous two-dimensional (2D) Fourier transform in polar coordinates has been recently developed but no discrete counterpart exists to date.
Natalie Baddour
doaj +1 more source