Results 61 to 70 of about 1,950,575 (284)

A new discrete fractional Fourier transform based on constrained eigendecomposition of DFT matrix by Largrange multiplier method [PDF]

1997 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2002
This paper is concerned with the definition of the discrete fractional Fourier transform (DFRFT). First, an eigendecomposition of the discrete Fourier transform (DFT) matrix is derived by sampling the Hermite Gauss functions which are eigenfunctions of the continuous Fourier transform and by performing a novel error removal procedure.
Pei, Soo-Chang, Tseng, Chien-Cheng
openaire   +2 more sources

Interfacial Electric Field Engineering of High‐Entropy Heterostructures Triggering Self‐Limiting Reconstruction for Industrial‐Scale Electrocatalysis

Advanced Science, EarlyView.
An interfacial electric field engineering strategy is proposed to trigger the self‐limiting surface reconstruction of high‐entropy heterostructures. Driven by this built‐in field, the controlled sacrificial leaching of W evolves a robust active layer, enabling exceptional oxygen evolution performance and ultrastability at ampere‐level current densities
Liang Yan, Yueqi Zhang, Bing Zhang, Jingyi Ye, Hao Li   +4 more
wiley   +1 more source

DFT-Based Channel Estimation with Symmetric Extension for OFDMA Systems

EURASIP Journal on Wireless Communications and Networking, 2009
A novel partial frequency response channel estimator is proposed for OFDMA systems. First, the partial frequency response is obtained by least square (LS) method.
Wang Yi, Li Lihua, Zhang Ping, Liu Zemin
doaj   +2 more sources

Task‐adaptive eigenvector‐based projection (EBP) transform for compressed sensing: A case study of spectroscopic profiling sensor

Analytical Science Advances, 2022
The compressed sensing (CS) theory requires the signal to be sparse under some transform. For most signals (e.g., speech and photos), the non‐adaptive transform bases, such as discrete cosine transform (DCT), discrete Fourier transform (DFT), and Walsh ...
Yinsheng Zhang, Haiyan Wang, Yongbo Cheng, Xiaolin Qin   +3 more
doaj   +1 more source

Programmed Interfacial Phase Separation for Spatiotemporal Fungicide Delivery via Tunable Micro/Nano Architectures

Advanced Science, EarlyView.
ABSTRACT Translating dynamic liquid‐liquid phase separation into robust solid‐state architectures remains a challenge in materials engineering. Here, we report a composition‐driven interfacial assembly strategy that couples supramolecular coacervation with metal‐phenolic coordination to engineer tunable fungicide carriers.
Rui Zhang, Tongfang Jing, Leiming He, Kaidi Cui, Yuying Song, Xuewei Mao, Lidong Cao, Lin Zhou   +7 more
wiley   +1 more source

The New Formulas of Simultaneously Calculating DFT and IDFT of Real Sequences and Its Application in Digital Audio Watermarking

工程科学与技术, 2008
:In order to improve the efficient of digital audio watermarking embedding, by exploiting the new formulas of simultaneously calculating the discrete Fourier transform and inverse discrete Fourier transform of a N real sequence, an improved digital audio
范安东, 孙琦
doaj  

Bidirectional Soft Catalysts for Improved Power Performance of Li‐S Batteries

Advanced Science, EarlyView.
A soft polymer‐metal catalyst is integrated into the binder to create a catalytically active microenvironment that accelerates bidirectional sulfur redox kinetics in lithium‐sulfur batteries. A model polyvinyl alcohol‐Cu catalyst enables high areal capacities at demanding current densities and stable cycling in pouch‐cell prototypes at 0.5 C, achieving
Maleesha M. Nishshanke, Petar Jovanovic, Swarit Dwivedi, Declan McNamara, Akshat Tanksale, Mahdokht Shaibani, Matthew Hill, Mainak Majumder   +7 more
wiley   +1 more source

Error Estimates on Approximating the Finite Fourier Transform of Complex-Valued Functions via a Pre-Grüss Inequality [PDF]

, 2004
Some estimates for the error in approximating the Finite Fourier Transform in terms of exponential means via a pre-Grüss inequality for complex-valued functions are ...
Hanna, George T, Roumeliotis, John, Dragomir, Sever S   +2 more
core   +3 more sources

Analysis of Discrete Fourier Transform: Finite-Dimensional Hilbert Space in Electroencephalogram Signal

Journal of Applied Informatics and Computing
The Discrete Fourier Transform (DFT) allows the digital signals representation in the frequency domain by decomposing discrete signals into finite sinusoidal components.
Fajar Ilham Maulana, Yani Ramdani, Gani Gunawan   +2 more
doaj   +1 more source

Elastomeric Core‐Conductive Shell Slurry Additive Stabilizes High‐Voltage NCM811 Cathodes via Mechanical‐Electrical Dual Regulation

Advanced Science, EarlyView.
A core‐shell ASA slurry additive constructs a mosaic‐like interface on high‐voltage NCM811 cathodes. This architecture decouples interfacial functions: the elastomeric core buffers mechanical stress to prevent microcracking, while the conductive shell facilitates rapid ion/electron transport, enabling mechanical‐electrical dual regulation and enhanced ...
Jiamin Duan, Xingchen Liu, Jiapei Li, Zhuijun Xu, Said Amzil, Baohu Wu, Yiyao Xiao, Wenjun Zhang, Tong Yu, Xiaohong Li, Wenwen Xue, Xiangyu Chen, Changwei Liu, Jie Gao, Peter Müller‐Buschbaum, Ya‐Jun Cheng, Yonggao Xia   +16 more
wiley   +1 more source