Results 111 to 120 of about 129,078 (307)

Fast-responding measurements of power system harmonics using discrete and fast fourier transforms with low spectral leakage

, 2011
Conventional wisdom dictates that a Fast Fourier Transform (FFT) will be a more computationally effective method for measuring multiple harmonics than a Discrete Fourier Transform (DFT) approach.
A. Cruden, Burt, Graeme M., A.J. Roscoe, R. Carter, Carter, R., Cruden, A., Roscoe, Andrew J., G.M. Burt   +7 more
core   +1 more source

Dipole‐Engineered Conductive Additives for Ultrastable Interphase Evolution in High‐Areal‐Capacity Silicon Anodes

Advanced Functional Materials, EarlyView.
In the work reported herein, dipole‐engineered sulfonated carbon nanofibers enable conductive additives to actively regulate interphase formation in silicon anodes. Polar sulfonyl groups guide electrolyte decomposition to form a compact LiF‐rich interphase while promoting robust integration with silicon.
Song Kyu Kang, Hyeonju Kim, Jeongbin Cho, Minseon Park, Taehun Kim, Seonghun Sin, Won Bae Kim   +6 more
wiley   +1 more source

eFFT-C++: An Open-Source Implementation of the Event-Based Fast Fourier Transform

Journal of Open Research Software
Event-based vision has recently emerged as a powerful paradigm for capturing visual information with high temporal precision and minimal redundancy. Unlike traditional frame-based cameras, event cameras asynchronously detect per-pixel brightness changes ...
Raul Tapia, José Ramiro Martínez-de Dios, Anibal Ollero   +2 more
doaj   +1 more source

In Situ Crystalline‐Amorphous Composite Oxide Structure Suppressing Thermal Wear Instability for Refractory Multi‐Principal Element Alloy

Advanced Functional Materials, EarlyView.
An effective strategy is developed to overcome the medium temperatures wear resistance degradation in refractory multi‐principal element alloys. By utilizing chemical short‐range ordering to trigger oxygen‐induced amorphization, a composite oxide structure is formed, which combines high hardness with robust stiffness.
Xuhui Pei, Jianbao Zhang, Hanming Wang, Yin Du, Tao Yang, Ji‐Jung Kai, Benyebka Bou‐Saïd, Haifeng Wang   +7 more
wiley   +1 more source

Fast Algorithms for Discrete Fourier Transform and Discrete Hartley Transform

, 2007
離散傅利葉轉換(DFT)與離散哈特利轉換(DHT)的快速演算法已經被研究了釵h年了，最近幾年，split-radix-2/8的快速傅利葉轉換演算法也被發表了，這種演算法的運算複雜度跟以往的split-radix-2/4快速傅利葉轉換的演算法一樣，但是卻可以省下25%的資料讀取與儲存的動作。 在這篇論文中，我們用split-radix-2/8的方式推導出了split vector-radix-2/8二維快速傅利葉轉換的演算法。我們發現跟一維的情況一樣可以省下25%的資料傳輸量，除此之外，跟split ...
Chen, Wei-Yu, 陳威宇
core  

Spectroscopic Investigation of Polysulfide Redox Evolution in Catholyte Solutions for Potassium–Sulfur Batteries

Advanced Functional Materials, EarlyView.
Potassium–sulfur batteries are investigated using UV–vis spectroscopy to track the evolution of potassium polysulfide species at elevated temperature. The study reveals sulfur radical anions as key intermediates and shows how solvent composition and cell design influence polysulfide stability, redox behavior, and cycling performance, providing insights
Chiara Morini, Dawid Kasprzak, Lincoln Crowe, Cecilia Spedalieri, Johannes Baller, Naiyu Qi, Fariza Kalyk, Gustav Graeber   +7 more
wiley   +1 more source

Analyzing Peak-to-Average Power Ratio Characteristics in Multi-Channel Intensity Modulation and Direct Detection Flexible Transceivers Deploying Inverse Fast Fourier Transform/Fast Fourier Transform-Based Processing. [PDF]

Sensors (Basel), 2023
Chen L, Huang X, Jin W, Wang X, Yang G, Jiang M, Huang Y, Tang J.   +7 more
europepmc   +1 more source

Using EMD-FrFT filtering to mitigate high power interference in chirp tracking radars

, 2011
This letter presents a new signal processing subsystem for conventional monopulse tracking radars that offers an improved solution to the problem of dealing with manmade high power interference (jamming).
Soraghan, John, John J. Soraghan, Elgamel, Sherif, Sherif A. Elgamel   +3 more
core   +1 more source

Self‐Adaptive Anhydrous Passivation Mitigates Open‐Circuit Voltage Loss in Pb‐Sn Mixed Perovskite Solar Cells

Advanced Functional Materials, EarlyView.
In this report, a self‐adaptive anhydrous passivation strategy is introduced by incorporating trimellitic anhydride (TMAH) into the perovskite precursor. In situ hydrolysis of TMAH yields trimellitic acid (TMA); ‐C═O/‐COO− groups of TMAH/TMA form a chelate with undercoordinated Pb2+/Sn2+, regulate nucleation, promote (100) orientation, passivate ...
Md. Ataur Rahman, Md. Abdul Karim, Md. Emrul Kayesh, Siliang Cao, Shamim Ahmmed, Kiyoto Matsuishi, Ashraful Islam   +6 more
wiley   +1 more source

Projection of acoustic fields using the Fourier transform

, 1985
A method is presented for projecting acoustic fields using the Fourier transform. It is shown that the source velocity distribution can be represented by a number of sinusoids.
Yudelman, Errol
core