Results 131 to 140 of about 13,447 (294)

Transient Charging of Mixed Ionic‐Electronic Conductors by Anomalous Diffusion

Advanced Materials, EarlyView.
This article explores charge transport in mixed ionic‐electronic conductors (MIECs) through electrochemical impedance spectroscopy and transient current analysis. Focusing on PEDOT:PSS, WO3, and n‐doped PBDF, it uncovers the impact of anomalous diffusion via fractional modeling. The study reveals key correlations that deepen understanding and guide the
Heyi Zhang, Gonzalo Rivera‐Sierra, Shirin Siahjani‐Gultekin, Jenifer Rubio‐Magnieto, Anis Allagui, Ignacio Sanjuán, David Franco, Antonio Guerrero, Enrique H. Balaguera, Juan Bisquert   +9 more
wiley   +1 more source

Mutil-Component LFM Signal Parameter Estimation Method Using STFT And Zoom-FRFT

四川大学学报. 自然科学版, 2016
Traditional parameter estimation methods of multi-component linear frequency modulation (MLFM) signal based on Fractional Fourier transform (FRFT) could solve neither the satisfactory precision nor the lesser computation cost.
SUN Le, ZHANG Heng-Yang, WEI Jun, LIU Li
doaj  

Beyond Presumptions: Toward Mechanistic Clarity in Metal‐Free Carbon Catalysts for Electrochemical H2O2 Production via Data Science

Advanced Materials, EarlyView.
Metal‐free carbon catalysts enable the sustainable synthesis of hydrogen peroxide via two‐electron oxygen reduction; however, active site complexity continues to hinder reliable interpretation. This review critiques correlation‐based approaches and highlights the importance of orthogonal experimental designs, standardized catalyst passports ...
Dayu Zhu, Hsi‐wen Wu, Xiao Wang, Jie Zhang   +3 more
wiley   +1 more source

分数阶傅里叶变换在轴承故障诊断中的应用

Journal of Harbin University of Science and Technology, 2017
In fault diagnosis of rolling bearings，the fault signal is easy to be interfered by the ambient noise， Therefore，an approach based on Fractional Fourier Transform( FＲFT) is studied in this research to collect valid data of rolling bearing fault.
SHAO Yan, LU Di, YANG Guang-xue
doaj   +1 more source

Microscopic Insights into Magnetic Warping and Time‐Reversal Symmetry Breaking in Topological Surface States of Rare‐Earth‐Doped Bi2Te3

Advanced Materials, EarlyView.
Magnetic doping of the topological insulator Bi2Te3 with erbium adatoms induces out‐of‐plane magnetism and breaks time‐reversal symmetry, opening a Dirac gap and driving a Fermi surface transition from hexagonal to star‐of‐David geometry. Microscopy, spectroscopy, and magnetic dichroism reveal atomically controlled magnetic interactions that tailor the
Beatriz Muñiz Cano, Fabián Calleja, Ji Dai, Massimo Tallarida, Vera Marinova, Alessandro Barla, Marc G. Cuxart, Pierluigi Gargiani, Gonzalo N. Molina, José Angel Silva‐Guillén, Adriana I. Figueroa, Kevin García‐Díez, Sergio O. Valenzuela, Aitor Mugarza, Amadeo L. Vázquez de Parga, Rodolfo Miranda, Francisco Guinea, Manuela Garnica, Miguel A. Valbuena   +18 more
wiley   +1 more source

Robust Fractional Low-Order Multiple Window STFT for Infinite Variance Process Environment

IET Signal Processing
Mechanical fault vibration signal is a typical non-Gaussian process, they can be characterized by the infinite variance process, and the noise within these signals may also be the process in complex environments.
Haibin Wang, Changshou Deng, Junbo Long, Youxue Zhou   +3 more
doaj   +1 more source

Introduction to the Fractional Fourier Transform and Its Applications

, 1999
This chapter is an introduction to the fractional Fourier transform and its applications. The fractional Fourier transform is a generalization of the ordinary Fourier transform with an order parameter a.
Haldun M. Ozaktas, Özaktaş, Haldun M., Kutay, Mehmet Alper, Mendlovic, D., M. Alper Kutay, David Mendlovic   +5 more
core   +1 more source

Water Permeates and Plasticizes Amorphous Carbon Dots: Unraveling the Inner Accessibility of the Nanoparticles by Glass Transition Studies

Advanced Materials, EarlyView.
The water permeability of amorphous carbon dots (CDs) is demonstrated by investigating their plasticization. Novel polyamide‐based and amorphous nanoparticles are synthesized by controlling their inner packing density. Water plasticization is evidenced by the decrease of the CDs glass transition temperature with increasing the hydration degree.
Elisa Sturabotti, Valerio Di Lisio, Lucia Cardo, Alessandro Camilli, Estela Moretón Alfonsín, Daniele Cangialosi, Amaia Iturrospe Ibarra, Arantxa Arbe, Maurizio Prato   +8 more
wiley   +1 more source

Robust image watermarking using ant colony optimization and fast generic radial harmonic Fourier moment calculation

IET Image Processing
In open networks, the geometric deformation and common image processing are common image manipulation modes, which pose a great challenge in robust watermarking. To improve the robustness of GRHFM‐based watermarking, a watermarking algorithm based on the
Wenbing Wang, Liu Feng
doaj   +1 more source

Generalized Fractional Interpolated Discrete Fourier Transform with Rectangular Window for Frequency Estimation in Noisy Sinewave Signals

Metrology
Accurate and efficient frequency estimation is essential in many scientific fields and has led to the development of various algorithms. Commonly used methods involve applying the Discrete Fourier Transform followed by spectral interpolation.
Fernando M. Janeiro, Pedro M. Ramos
doaj   +1 more source