Results 11 to 20 of about 4,499,306 (241)
Excitation of vibrational soft modes in disordered systems using active oscillation [PDF]
, 2016 We propose a new method to characterize the spatial distribution of particles' vibrations in solids with much lower computational costs compared to the usual normal mode analysis.
72167 +3 more
core +2 more sources
A new positive time-frequency distribution [PDF]
, 1994 This article studies the formulation of new members of the Cohen-Posch (1985) class of positive time-frequency energy distributions. Members of this class are always positive functionals and satisfy the marginal constraints.
Nikias, C L +1 more
core +1 more source
Sparse Envelope Spectra for Feature Extraction of Bearing Faults Based on NMF
Applied Sciences, 2019 Periodic impulses and the oscillation response signal are the vital feature indicators of rolling bearing faults. However, finding the suitable feature frequency band is usually difficult due to the interferences of other components and multiple ...
Lin Liang +4 more
doaj +1 more source
The Random Walk of High Frequency Trading [PDF]
, 2014 This paper builds a model of high-frequency equity returns by separately modeling the dynamics of trade-time returns and trade arrivals. Our main contributions are threefold.
Aldrich, Eric M. +2 more
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A Novel Signal Separation Method Based on Improved Sparse Non-Negative Matrix Factorization
Entropy, 2019 In order to separate and extract compound fault features of a vibration signal from a single channel, a novel signal separation method is proposed based on improved sparse non-negative matrix factorization (SNMF).
Huaqing Wang +4 more
doaj +1 more source
Speech Enhancement Based on Time-Frequency Domain GAN [PDF]
Jisuanji kexue, 2022 The traditional speech enhancement algorithm based on generative adversarial networks (SEGAN) enhances speech in the time domain,and completely ignores the distribution of speech samples in frequency domain.Under the condition of low signal-to-noise ...
YIN Wen-bing, GAO Ge, ZENG Bang, WANG Xiao, CHEN Yi
doaj +1 more source
Novel characterization method of impedance cardiography signals using time-frequency distributions [PDF]
, 2018 The purpose of this document is to describe a methodology to select the most adequate time-frequency distribution (TFD) kernel for the characterization of impedance cardiography signals (ICG). The predominant ICG beat was extracted from a patient and was
Escrivá Muñoz, Jesús +4 more
core +2 more sources
A time-domain veto for binary inspirals search [PDF]
, 2004 We describe a test to distinguish between actual gravitational waves from binary inspiral and false noise triggers. The test operates in the time domain, and considers the time evolution of the correlator and its statistical distribution.
Guidi, G. M.
core +1 more source
Remote Sensing, 2023 The extraction of the micro-Doppler (m-D) feature based on time-frequency distribution (TFD) is of great significance for target detection and identification.
Yang Yang +4 more
doaj +1 more source
Time delay in the Kuramoto model with bimodal frequency distribution [PDF]
, 2006 We investigate the effects of a time-delayed all-to-all coupling scheme in a large population of oscillators with natural frequencies following a bimodal distribution.
Diego Pazó +4 more
core +2 more sources