Results 21 to 30 of about 1,008,946 (253)

The Validity of Ultra-Short-Term Heart Rate Variability during Cycling Exercise

Sensors, 2023
Ultra-short-term heart rate variability (HRV) has been validated in the resting state, but its validity during exercise is unclear. This study aimed to examine the validity in ultra-short-term HRV during exercise considering the different exercise ...
Yukiya Tanoue, Shihoko Nakashima, Tomohiro Komatsu, Miki Kosugi, Saki Kawakami, Shotaro Kawakami, Ryoma Michishita, Yasuki Higaki, Yoshinari Uehara   +8 more
doaj   +1 more source

Characterization of Frequency Domains of Bandlimited Frame Multiresolution Analysis

Mathematics, 2021
Framelets have been widely used in narrowband signal processing, data analysis, and sampling theory, due to their resilience to background noise, stability of sparse reconstruction, and ability to capture local time-frequency information.
Zhihua Zhang
doaj   +1 more source

Comparison of Frequency Domain and Time-Domain Methods for Aeromechanical Analysis

International Journal of Rotating Machinery, 2016
Unsteady flow around an oscillating plate cascade and that through a single compressor rotor subject to vibration have been computationally studied, aimed at examining the predictive ability of two low fidelity frequency methods compared with a high ...
M. T. Rahmati
doaj   +1 more source

Design and Embedded Implementation of Secure Image Encryption Scheme Using DWT and 2D-LASM

Entropy, 2022
In order to further improve the information effectiveness of digital image transmission, an image-encryption algorithm based on 2D-Logistic-adjusted-Sine map (2D-LASM) and Discrete Wavelet Transform (DWT) is proposed.
Heping Wen, Zefeng Chen, Jiehong Zheng, Yiming Huang, Shuwei Li, Linchao Ma, Yiting Lin, Zhen Liu, Rui Li, Linhao Liu, Wenxing Lin, Jieyi Yang, Chongfu Zhang, Huaide Yang   +13 more
doaj   +1 more source

Enhancing latent palmprints using frequency domain analysis

Intelligent Systems with Applications
Latent palmprints are integral to crime scene investigations, constituting a significant portion of encountered prints. They often suffer from poor ridge impressions, noise, and pronounced creases, setting them apart from other palmprint types.
Javad Khodadoust, Raúl Monroy, Miguel Angel Medina-Pérez, Octavio Loyola-González, Vutipong Areekul, Worapan Kusakunniran   +5 more
doaj   +1 more source

Preparation and electrochemical noise characteristics of graphene-composite coating with different contents of 7A52 aluminum alloy matrix

工程科学学报, 2018
In the harsh marine environment, the traditional aluminum alloy coating has difficulty meeting the requirements of use, which can affect equipment performance.
SUN Xiao-feng, HAO Song-song, SONG Wei, LI Zhan-ming, SHI Yu-peng   +4 more
doaj   +1 more source

Spectral and Nonlinear Analysis of Electrodermal Activity in Adolescent Anorexia Nervosa

Applied Sciences, 2020
Anorexia nervosa (AN) is an eating disorder with increasing prevalence in childhood and adolescence. Sympathetic dysregulation is supposed to be the underlying mechanism of increased cardiovascular risk in AN.
Zuzana Visnovcova, Lucia Bona Olexova, Nikola Sekaninova, Igor Ondrejka, Igor Hrtanek, Dana Cesnekova, Simona Kelcikova, Ivan Farsky, Ingrid Tonhajzerova   +8 more
doaj   +1 more source

Organoids in pediatric cancer research

FEBS Letters, EarlyView.
Organoid technology has revolutionized cancer research, yet its application in pediatric oncology remains limited. Recent advances have enabled the development of pediatric tumor organoids, offering new insights into disease biology, treatment response, and interactions with the tumor microenvironment.
Carla Ríos Arceo, Jarno Drost
wiley   +1 more source

Equivalence analysis of dielectric test methods in time domain and frequency domain

International Journal of Electrical Power & Energy Systems
Wideband dielectric response is crucial for accurate assessment of insulation condition. However, time-domain measurements such as polarization and depolarization current (PDC) tests often lose high-frequency components, while frequency domain ...
Lin Du, Xin Li, Shixian Hui, Chao Xing
doaj   +1 more source

Spatiotemporal and quantitative analyses of phosphoinositides – fluorescent probe—and mass spectrometry‐based approaches

FEBS Letters, EarlyView.
Fluorescent probes allow dynamic visualization of phosphoinositides in living cells (left), whereas mass spectrometry provides high‐sensitivity, isomer‐resolved quantitation (right). Their synergistic use captures complementary aspects of lipid signaling. This review illustrates how these approaches reveal the spatiotemporal regulation and quantitative
Hiroaki Kajiho, Shin Morioka, Junko Sasaki, Takehiko Sasaki   +3 more
wiley   +1 more source