Results 21 to 30 of about 2,238,481 (242)

Real-time updating of the flood frequency distribution through data assimilation [PDF]

Hydrology and Earth System Sciences, 2017
We explore the memory properties of catchments for predicting the likelihood of floods based on observations of average flows in pre-flood seasons.
C. Aguilar, A. Montanari, M.-J. Polo
doaj   +1 more source

Implementation of an optical fiber frequency distribution via commercial DWDM [PDF]

, 2016
The rapid development in communication infrastructure over the past decades entails an increasing dependence on time and frequency, as well as its redundant distribution.
Hedekvist, Per Olof, Karlsson, Magnus, Hedekvist, Per Olof E,, Ebenhag, S. C., Sven-Christian Ebenhag, Zelan, M., Ebenhag, Sven-Christian,, Hedekvist, Per Olof,, Karlsson, Magnus,, Ebenhag, Sven-Christian, Zelan, Martin,, Zelan, M.,, Per Olof Hedekvist, Hedekvist, Per Olof E, Martin Zelan, Magnus Karlsson   +15 more
core   +1 more source

Spatial time-frequency distribution of cross term-based direction-of-arrival estimation for weak non-stationary signal

EURASIP Journal on Wireless Communications and Networking, 2019
In the radar array signal processing direction of arrival (DOA), the estimation of weak non-stationary signal is an important and difficult problem when both strong and weak signals are coexisting particularly because the weak non-stationary signals are ...
Shuai Shao, Aijun Liu, Changjun Yu, Hongjuan Yang, Yong Li, Bo Li   +5 more
doaj   +1 more source

Interevent-time distribution and aftershock frequency in non-stationary induced seismicity

Scientific Reports, 2021
The initial footprint of an earthquake can be extended considerably by triggering of clustered aftershocks. Such earthquake–earthquake interactions have been studied extensively for data-rich, stationary natural seismicity.
Richard A. J. Post, Matthias A. J. Michels, Jean-Paul Ampuero, Thibault Candela, Peter A. Fokker, Jan-Diederik van Wees, Remco W. van der Hofstad, Edwin R. van den Heuvel   +7 more
doaj   +1 more source

SchizoNET: A robust and accurate Margenau-Hill time-frequency distribution based deep neural network model for schizophrenia detection using EEG signals [PDF]

, 2023
Objective. Schizophrenia (SZ) is a severe chronic illness characterized by delusions, cognitive dysfunctions, and hallucinations that impact feelings, behaviour, and thinking.
Khare, Smith K, Bajaj, Varun, Acharya, U Rajendra   +2 more
core   +1 more source

An Adaptive Chirp Mode Decomposition-Based Method for Modal Identification of Time-Varying Structures

Mathematics
Modal parameters are inherent characteristics of civil structures. Due to the effect of environmental factors and ambient loads, the physical and modal characteristics of a structure tend to change over time.
Xiao-Jun Yao, Yu-Chun Lv, Xiao-Mei Yang, Feng-Yang Wang, Yong-Xiang Zheng   +4 more
doaj   +1 more source

A Comparative Study of Time-Frequency Representations for Fault Detection in Wind Turbine [PDF]

, 2011
To reduce the cost of wind energy, minimization and prediction of maintenance operations in wind turbine is of key importance. In variable speed turbine generator, advanced signal processing tools are required to detect and diagnose the generator faults ...
CHARPENTIER, Jean-Frederic, G. Barakat, EL BOUCHIKHI, EL HOUSSIN, BENBOUZID, Mohamed, BARAKAT, Georges, V. Choqueuse, Choqueuse, Vincent, V., J.F. Charpentier, El.H. Bouchikhi, M.E.H. Benbouzid, CHOQUEUSE, Vincent   +10 more
core   +1 more source

Reduced bias time-frequency peak filtering [PDF]

, 2001
Time-frequency peak filtering (TFPF) allows the reconstruction of signals from observations corrupted by additive noise by encoding the noisy signal as the instantaneous frequency (IF) of an FM analytic signal.
Boashash, Boualem, Mesbah, Mostefa
core   +1 more source

Deep Neural Networks for Estimating Regularization Parameter in Sparse Time–Frequency Reconstruction

Technologies
Time–frequency distributions (TFDs) are crucial for analyzing non-stationary signals. Compressive sensing (CS) in the ambiguity domain offers an approach for TFD reconstruction with high performance, but selecting the optimal regularization parameter for
Vedran Jurdana
doaj   +1 more source

Analyse des signaux multicomposante à modulation de fréquence linéaire par la transformation de Teager-Huang-Hough [PDF]

, 2014
A novel detection approach of linear FM (LFM) signals, with single or multiple components, in the time-frequency plane of Teager-Huang (TH) transform is presented.
BOUDRAA, Abdelouahab, BOUCHIKHI, Abdelkhalek, CEXUS, Jean-Christophe, CHONAVEL, Thierry, BOUDRAA, Abdel-Ouahab   +4 more
core   +1 more source