Results 21 to 30 of about 8,142,358 (299)

Spectral density constraints on wireless communication [PDF]

open access: yes, 2020
Environmental exposure to man-made electromagnetic field (EMF) has been rising as modern technologies have grown and changed in social behaviour have generated more synthetic sources. For the safety of human health, EMF levels need to be regulated.
Shahab Abdulla   +7 more
core   +1 more source

Comparison of Semi-Empirical Single Point Wall Pressure Spectrum Models with Experimental Data

open access: yesFluids, 2021
This study presents an evaluation of semi-empirical single-point wall pressure spectrum models by comparing model predictions with wind tunnel and flight test data.
Nicholas Thomson, Joana Rocha
doaj   +1 more source

Application of power spectral density and the support vector machine to fault diagnosis for permanent magnet synchronous motor

open access: yesSN Applied Sciences, 2022
Article highlights The main novel contributions of this study are outlined as follow: Fault feature extraction using stator current power spectral density estimator. A comparative study between two Power Spectral Density estimators.
Sara Zerdani   +2 more
doaj   +1 more source

Investigation of the parameters of the process of turning on the afterburner of GTE

open access: yesАвіаційно-космічна техніка та технологія, 2022
The subject of research in this article is the process of turning on the afterburner combustion chamber of a modern turbojet bypass engine. The parameters of switching in the afterburner were studied: pressure pulsations of the gas flow between the high-
Volodymyr Zhuravlyov   +2 more
doaj   +1 more source

Power Spectral Density Error Analysis of Spectral Subtraction Type of Speech Enhancement Methods

open access: yesEURASIP Journal on Advances in Signal Processing, 2007
A theoretical framework for analysis of speech enhancement algorithms is introduced for performance assessment of spectral subtraction type of methods. The quality of the enhanced speech is related to physical quantities of the speech and noise (such ...
Peter Händel
doaj   +2 more sources

Spectrum sensing based on cumulative power spectral density

open access: yesEURASIP Journal on Advances in Signal Processing, 2017
This paper presents new spectrum sensing algorithms based on the cumulative power spectral density (CPSD). The proposed detectors examine the CPSD of the received signal to make a decision on the absence/presence of the primary user (PU) signal.
A. Nasser   +4 more
doaj   +1 more source

Power Spectral Density Conversions and Nonlinear Dynamics

open access: yesShock and Vibration, 1994
To predict the vibration environment of a payload carried by a ground or air transporter, mathematical models are required from which a transfer function to a prescribed input can be calculated.
Mostafa Rassaian
doaj   +1 more source

Modern Measurements of Fission Reactor Power Spectral Density [PDF]

open access: yesEPJ Web of Conferences
Power spectral density measurement techniques allow to derive information on nuclear reactors. In specific conditions, one can obtain reactor’s kinetic parameters.
Caulier Gilles   +3 more
doaj   +1 more source

Gravitational-wave astronomy with an uncertain noise power spectral density

open access: yesPhysical Review Research, 2020
In order to extract information about the properties of compact binaries, we must estimate the noise power spectral density of gravitational-wave data, which depends on the properties of the gravitational-wave detector. In practice, it is not possible to
Colm Talbot, Eric Thrane
doaj   +1 more source

Measurement and Analysis of Industrial Forklifts Vibration Levels for Unit Load Testing Purposes

open access: yesApplied Sciences, 2021
Forklifts are one of the most common types of material handling equipment used in warehouses and distribution centers. Vibration generated by forklifts may have an effect on the performance of unit loads and product damage rates.
Yu Yang Huang   +2 more
doaj   +1 more source

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