Results 21 to 30 of about 4,622,355 (269)

Comparison of Frequency Domain and Time-Domain Methods for Aeromechanical Analysis

open access: yesInternational Journal of Rotating Machinery, 2016
Unsteady flow around an oscillating plate cascade and that through a single compressor rotor subject to vibration have been computationally studied, aimed at examining the predictive ability of two low fidelity frequency methods compared with a high ...
M. T. Rahmati
doaj   +1 more source

Application of Coupled-Wave Wentzel-Kramers-Brillouin Approximation to Ground Penetrating Radar

open access: yesRemote Sensing, 2017
This paper deals with bistatic subsurface probing of a horizontally layered dielectric half-space by means of ultra-wideband electromagnetic waves. In particular, the main objective of this work is to present a new method for the solution of the two ...
Igor Prokopovich   +3 more
doaj   +1 more source

Continuous Time Frequency Domain Analysis of Ф-OTDR Nonstationary Signals

open access: yesJournal of Harbin University of Science and Technology, 2021
Most of the natural vibration signals are stationary and modulated by the interference light signal of the distributed optical fiber vibration sensing system.
XU Tao, LI Li
doaj   +1 more source

Equivalence analysis of dielectric test methods in time domain and frequency domain

open access: yesInternational Journal of Electrical Power & Energy Systems
Wideband dielectric response is crucial for accurate assessment of insulation condition. However, time-domain measurements such as polarization and depolarization current (PDC) tests often lose high-frequency components, while frequency domain ...
Lin Du, Xin Li, Shixian Hui, Chao Xing
doaj   +1 more source

Time Domain Vibration Analysis of an Ice Shelf

open access: yesJournal of Marine Science and Engineering
A method is presented to calculate the vibrations of an ice shelf floating in shallow water under different boundary conditions. One condition is that there is no flux, which reduces all calculations and the other is that there is no pressure at the ...
Rehab Aljabri, Michael H. Meylan
doaj   +1 more source

Combining domain knowledge and statistical models in time series analysis

open access: yes, 2006
This paper describes a new approach to time series modeling that combines subject-matter knowledge of the system dynamics with statistical techniques in time series analysis and regression.
Lai, Tze Leung, Wong, Samuel Po-Shing
core   +2 more sources

Time domain analysis of excess loss in electrical steel [PDF]

open access: yesSerbian Journal of Electrical Engineering, 2019
The aim of this paper is to present a comprehensive approach to analyse and interpret power loss in ferromagnetic materials with particular attention devoted to excess power loss.
Koprivica Branko   +2 more
doaj   +1 more source

Statistical analysis of audible noise generated by AC corona discharge from single corona sources

open access: yesHigh Voltage, 2018
Time-domain waveforms of sound pressure pulses generated by alternate current (AC) corona discharge from single corona sources are measured. The pulse amplitude and time interval of sound pressure pulses in positive and negative half cycles are analysed ...
Xuebao Li   +4 more
doaj   +1 more source

TIME Domain Analysis of Sound Signals for Bearing Damage Identification [PDF]

open access: yes, 2014
Time domain analysis requires less computational time compared to the frequency domain. Analysis is performed directly on the signal without any conversion at all.
Aswin, M. (Muhammad)   +3 more
core  

Polarization reversal and jump-like domain wall motion in stoichiometric LiTaO 3 produced by vapor transport equilibration [PDF]

open access: yes, 2012
The polarization reversal and domain structure evolution has been studied in stoichiometric lithium tantalate prepared by vapor transport equilibration process.
Akhmatkhanov, A. R.   +4 more
core   +1 more source

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