Results 11 to 20 of about 4,487,534 (292)

Temporal Flow Characteristics of Three-Dimensional Centrifugal Impeller Suction System at Vacuum Conditions [PDF]

open access: yesJournal of Applied Fluid Mechanics, 2023
Temporal flow characteristics of a 3D centrifugal impeller suction system were numerically studied in vacuum conditions. The blockage of the high-speed rotating impeller appeared, which greatly dropped the suction of the layer suction device.
Y. Li   +5 more
doaj   +1 more source

Spectrum Analysis Enabled Periodic Feature Reconstruction Based Automatic Defect Detection System for Electroluminescence Images of Photovoltaic Modules

open access: yesMicromachines, 2022
Electroluminescence (EL) imaging is a widely adopted method in quality assurance of the photovoltaic (PV) manufacturing industry. With the growing demand for high-quality PV products, automatic inspection methods based on machine vision have become an ...
Jiachuan Yu   +8 more
doaj   +1 more source

Functional singular spectrum analysis [PDF]

open access: yesStat, 2021
In this paper, we develop a new extension of the singular spectrum analysis (SSA) called functional SSA to analyze functional time series. The new methodology is constructed by integrating ideas from functional data analysis and univariate SSA. Specifically, we introduce a trajectory operator in the functional world, which is equivalent to the ...
Hossein Haghbin   +4 more
openaire   +3 more sources

Effects of cutting the blade on the performance and pressure pulsation of a centrifugal pump

open access: yesEnergy Science & Engineering, 2020
To solve the severe flow‐induced vibration during the pump operation, the impeller cut is a reasonable and operable approach. In the present study, effects of cutting the blade on the pump performance, especially for pressure pulsations, are conducted by
Ning Zhang   +4 more
doaj   +1 more source

Assessing Exercise-Induced Bronchoconstriction in Children; The Need for Testing

open access: yesFrontiers in Pediatrics, 2019
Objective: Exercise-induced bronchoconstriction (EIB) is a specific morbidity of childhood asthma and a sign of insufficient disease control. EIB is diagnosed and monitored based on lung function changes after a standardized exercise challenge test (ECT).
Natasja Lammers   +9 more
doaj   +1 more source

Reading Tapes Backwards: A Legitimate Approach to Saving Time and Money in Digitization Projects?

open access: yesApplied Sciences, 2021
Audio carriers are subject to a fast and irreversible decay. In order to save valuable historical recordings, the audio signal and other relevant information can be extracted from the source audio document and stored on another medium, normally a ...
Federica Bressan   +5 more
doaj   +1 more source

A Frequency-Time Algorithm of Parameter Estimation for Sinusoidal Signal in Noise

open access: yesMeasurement Science Review, 2021
In this paper, a computationally efficient and high precision parameter estimation algorithm with frequency-time combination is proposed to improve the estimation performance for sinusoidal signal in noise, which takes the advantages of frequency- and ...
Chen Peng   +4 more
doaj   +1 more source

Analysis of High-Frequency Common Mode Component Characteristics of Common Mode Peak Voltage Suppression Method for Indirect Matrix Converter

open access: yesEnergies, 2022
A variety of modulation strategies for suppressing output common-mode voltage (CMV) of indirect matrix converters (IMC) have been proposed, but most of them mainly reduce the peak of CMV by 42.3%. The frequency-domain characteristics of CMV have not been
Haiming Liu   +5 more
doaj   +1 more source

Asymptotic Analysis of Spectrum and Stability for One Class of Singularly Perturbed Neutral-Type Time-Delay Systems

open access: yesAxioms, 2021
In this study, a singularly perturbed linear time-delay system of neutral type is considered. It is assumed that the delay is small of order of a small positive parameter multiplying a part of the derivatives in the system.
Valery Y. Glizer
doaj   +1 more source

Spectral mixture analysis of EELS spectrum-images [PDF]

open access: yes, 2012
Recent advances in detectors and computer science have enabled the acquisition and the processing of multidimensional datasets, in particular in the field of spectral imaging.
Brun, Nathalie, Dobigeon, Nicolas
core   +3 more sources

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