Results 21 to 30 of about 17,389 (226)

Phase controlled integrated interferometric single-sideband filter based on planar Bragg gratings implementing photonic Hilbert transform [PDF]

open access: yes, 2013
The first monolithically integrated all-optical single-sideband filter based on photonic Hilbert transform and planar Bragg gratings is proposed and experimentally demonstrated.
Smith, P.G.R.   +6 more
core   +1 more source

Bragg grating based integrated photonic Hilbert transformers [PDF]

open access: yes, 2013
Planar Bragg grating based photonic Hilbert transformers are experimentally demonstrated in this work. Planar Bragg gratings are utilized to implement a general Hilbert transform, a fractional order Hilbert transform and terahertz bandwidth Hilbert ...
Smith, P.G.R.   +7 more
core   +1 more source

A sufficient condition for the boundedness of operator-weighted martingale transforms and Hilbert transform [PDF]

open access: yes, 2007
Let W be an operator weight taking values almost everywhere in the bounded positive invertible linear operators on a separable Hilbert space H. We show that if W and its inverse W−1 both satisfy a matrix reverse Holder property introduced in [2], then ...
Pott, S.
core   +1 more source

Decomposition of Multicomponent Micro-Doppler Signals Based on HHT-AMD

open access: yesApplied Sciences, 2018
Micro-Doppler signals analysis has been emerging as an important topic in target identification, and relative research has been focusing on features extraction and separation of the radar signals.
Wenchao Li, Gangyao Kuang, Boli Xiong
doaj   +1 more source

Research on Roller Status Diagnosis of CRDM Based on SWT and HHT [PDF]

open access: yesE3S Web of Conferences, 2021
For the control rod drive mechanism roller vibration signal’s characteristics of nonlinear and nonstationary. Based on actual equipment life experiment and roller fault experiment, a status diagnosis method of roller of control rod drive mechanism based ...
Zhang Liming   +4 more
doaj   +1 more source

An Algorithm for Improving Hilbert-Huang Transform [PDF]

open access: yes, 2007
The Hilbert-Huang transform is viewed as a promising method to process the nonlinear and non-stationary signal. However, it hasn't been a general method in signal processing due to its some deficiencies. In this paper, an algorithm is proposed to resolve one of its deficiencies that the EMD will generate redundant IMFs at the low-frequency region. This
Song Guo, Guochang Gu, Changyou Li
openaire   +1 more source

Nonlinear Ultrasonic Detection Method for Delamination Damage of Lined Anti-Corrosion Pipes Using PZT Transducers

open access: yesApplied Sciences, 2018
Lined anti-corrosion pipes are widely used in oil and gas, petrochemical, pharmaceutical industries. However, defects, especially delamination, may occur in the production and service of pipes which result in safety accidents.
Xiaobin Hong   +4 more
doaj   +1 more source

Novel and efficient computation of Hilbert–Huang transform on surfaces [PDF]

open access: yesComputer Aided Geometric Design, 2016
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Jianping Hu   +2 more
openaire   +2 more sources

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

open access: yes, 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   +10 more
core   +1 more source

Propagation characteristics of acoustic emission wave in reinforced concrete

open access: yesResults in Physics, 2017
Due to the complexity of components and damage mechanism of reinforced concrete, the wave propagation characteristics in reinforced concrete are always complicated and difficult to determine.
Haoxiong Feng, Weijian Yi
doaj   +1 more source

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