Results 81 to 90 of about 37,958 (259)

Correct Application of the Discrete Fourier Transform in Harmonics

Advances in Electrical and Computer Engineering, 2008
The importance of the harmonic analysis and its frequent utilization in different applications impose a complete accuracy. The conditions which provide a correct harmonic analysis are emphasized and analytically justified in this paper.
MAIER, V., PAVEL, S. G., MAIER, C. D., BIROU, I.   +3 more
doaj   +1 more source

Wearable Morphology‐Adaptive in‐Ear Device With Active Cleansing Capability for Multimodal Health Monitoring

Advanced Materials, EarlyView.
We present SCIENCE, an in‐ear multimodal physiological monitor featuring two key innovations. Water‐triggered morphological expansion (a 2‐mm cylinder to a 9‐mm spindle) achieves conformal adaptation across complex canal geometries. Simultaneously, active biofouling mitigation disrupts cerumen barriers, reducing sensor‐skin impedance by 20%.
Shuyun Zhuo, Zihuan Wu, Anan Zhang, Shideh Kabiri Ameri   +3 more
wiley   +1 more source

A Wavelet-Wavelet Based Processing Approach for Microcalcifications Detection in Mammograms

Journal of Advances in Information Technology, 2012
A new methodology for the detection of microcalcifications (MCs) in mammograms is presented. Since MCs correspond to the high frequency components of the mammograms, a further multiresolution analysis is applied to these components.
Salim Lahmiri
doaj   +1 more source

Discrete Fourier Transform Windowing Techniques for Cerebral Physiological Research in Neural Injury: A Practical Demonstration. [PDF]

Neurotrauma Rep, 2023
Froese L, Sainbhi AS, Gomez A, Marquez I, Amenta F, Batson C, Stein KY, Zeiler FA.   +7 more
europepmc   +1 more source

Beyond Nanoporosity: A CO2‐Conditioned Glassy Matrix Contributes to the Brittle‐to‐Ductile Transition of Nanocellular Polyetherimide

Advanced Materials, EarlyView.
The mechanical performance of nanocellular polyetherimide cannot be explained by nanoporosity alone. It is shown that CO2 saturation and desorption leave a distinct mechanical signature in the glassy matrix before foaming. This matrix contribution provides a new route to understand and optimize the brittle to ductile transition in nanocellular polymers.
Félix Lizalde‐Arroyo, Frederik Van Loock, Victoria Bernardo, Tuuli Peltola, René Bes, Alberto Tena, Miguel Ángel Rodríguez‐Pérez, Judith Martín‐de León   +7 more
wiley   +1 more source

Hilbert-Twin – A Novel Hilbert Transform-Based Method To Compute The Elastic Modulus In High-Resolution Mechanical Spectroscopy HRMS

Archives of Metallurgy and Materials, 2015
A novel Hilbert-twin (H-twin) method is introduced as an alternative method for the computation of the resonant frequency for exponentially damped free decays embedded in noise.
Majewski M., Magalas L.B.
doaj   +1 more source

Zero-Watermarking for Vector Maps Combining Spatial and Frequency Domain Based on Constrained Delaunay Triangulation Network and Discrete Fourier Transform. [PDF]

Entropy (Basel), 2023
Xi X, Hua Y, Chen Y, Zhu Q.
europepmc   +1 more source

Electropolymerized Aptasensor for Femtogram‐Level Cytokine Detection

Advanced Materials, EarlyView.
Electropolymerization of 3‐amino‐ʟ‐tyrosine creates ultrathin, smooth, and chemically robust pALT nanofilms with accessible carboxyl functionalities for direct aptamer immobilization. Integrated with fiber‐optic SPR and OECT platforms, these interfaces enable IL‐6 detection down to 100 fg mL−1 and provide a versatile route to bioelectronic sensing ...
Jiyao Yu, Renan Colucci, Rachel X. Shi, Qi Lu, Tommaso Marchesi D'Alvise, Ulrike Kraft, Christopher V. Synatschke, Tanja Weil   +7 more
wiley   +1 more source

An efficient discrete Hankel transform based on convolutional Gaussian fast Fourier transform

Earth, Planets and Space
The numerical evaluation of Hankel transforms is fundamental to electromagnetic (EM) geophysics. Typically, this problem is addressed via two distinct paradigms: the digital linear filter (DLF) method, prioritized for its computational speed, and direct ...
Guanzheng Tian, Yuguo Li
doaj   +1 more source

Discrete Fourier Transform with Denoise Model Based Least Square Wiener Channel Estimator for Channel Estimation in MIMO-OFDM. [PDF]

Entropy (Basel), 2022
S D, Palanisamy S, Hajjej F, Khalaf OI, Abdulsahib GM, S R.   +5 more
europepmc   +1 more source