scholarly journals REACTOR-NOISE ANALYSIS IN THE TIME DOMAIN. AEC Critical Review Series.

1969 ◽  
Author(s):  
N. Pacilio
Keyword(s):  
Time Domain ◽  
Critical Review ◽  
Noise Analysis ◽  
The Time Domain ◽  
Reactor Noise

Electrochemical Noise Analysis on Corrosion of Aluminum Alloy

2010 ◽  
Vol 146-147 ◽  
pp. 1043-1048
Author(s):  
Zhi Qiang Tian ◽  
Xiao Dong Kong ◽  
Gang Wu ◽  
Yuan Sheng Wang
Keyword(s):  
Aluminum Alloy ◽  
Time Domain ◽  
Electrochemical Noise ◽  
Noise Analysis ◽  
Frequency Domain Analysis ◽  
Corrosion Process ◽  
Characteristic Parameters ◽  
Corrosion Characteristic ◽  
Spectra Analysis ◽  
The Time Domain

The characteristic parameters of electrochemical noise (EN) spectra were used to study the corrosion process of aluminum alloy in distilled water with or without chlorate (Cl-).The experimental results showed that the parameters obtained from the time-domain spectra analysis were not consistent with the parameters obtained from the frequency-domain analysis. This paper attempted to explain the phenomenon by the time-domain noise spectra, the corrosion characteristic of aluminum alloy, the source of noise transient, and the types of the pitting corrosion of aluminum alloy.

Spectral Moments and Pre-Envelope Covariances of Nonseparable Processes

1990 ◽  
Vol 57 (1) ◽  
pp. 218-224 ◽  
Author(s):  
Mario Di Paola ◽  
Giovanni Petrucci
Keyword(s):  
Stochastic Process ◽  
Time Domain ◽  
Critical Review ◽  
Stationary Case ◽  
Spectral Moments ◽  
Definition Of ◽  
The Time Domain ◽  
Made In

A critical review of the definition of the spectral moments of a stochastic process in the nonstationary case is presented. An adequate time-domain representation of the spectral moments in the stationary case is first established, showing that the spectral moments are related to the variances of the stationary analytical pre-envelope processes. The extension to the nonstationary case is made in the time domain evaluating the covariances of the nonstationary pre-envelope showing the differences between the proposed definition and the classical one made introducing the evolutionary power.

Apodisation in the time domain

1992 ◽  
Vol 2 (4) ◽  
pp. 615-620
Author(s):  
G. W. Series
Keyword(s):  
Time Domain ◽  
The Time Domain

JOINT INTERPRETATION OF AIRBORNE ELECTROMAGNETIC DATA IN THE TIME DOMAIN AND FREQUENCY DOMAIN

2018 ◽  
Vol 12 (7-8) ◽  
pp. 76-83
Author(s):  
E. V. KARSHAKOV ◽  
J. MOILANEN
Keyword(s):  
Fourier Transform ◽  
Frequency Domain ◽  
Time Domain ◽  
Frequency Interval ◽  
Single Spectrum ◽  
Simultaneous Inversion ◽  
Homogeneous Half Space ◽  
Time Domain Data ◽  
The Time Domain

Тhe advantage of combine processing of frequency domain and time domain data provided by the EQUATOR system is discussed. The heliborne complex has a towed transmitter, and, raised above it on the same cable a towed receiver. The excitation signal contains both pulsed and harmonic components. In fact, there are two independent transmitters operate in the system: one of them is a normal pulsed domain transmitter, with a half-sinusoidal pulse and a small "cut" on the falling edge, and the other one is a classical frequency domain transmitter at several specially selected frequencies. The received signal is first processed to a direct Fourier transform with high Q-factor detection at all significant frequencies. After that, in the spectral region, operations of converting the spectra of two sounding signals to a single spectrum of an ideal transmitter are performed. Than we do an inverse Fourier transform and return to the time domain. The detection of spectral components is done at a frequency band of several Hz, the receiver has the ability to perfectly suppress all sorts of extra-band noise. The detection bandwidth is several dozen times less the frequency interval between the harmonics, it turns out thatto achieve the same measurement quality of ground response without using out-of-band suppression you need several dozen times higher moment of airborne transmitting system. The data obtained from the model of a homogeneous half-space, a two-layered model, and a model of a horizontally layered medium is considered. A time-domain data makes it easier to detect a conductor in a relative insulator at greater depths. The data in the frequency domain gives more detailed information about subsurface. These conclusions are illustrated by the example of processing the survey data of the Republic of Rwanda in 2017. The simultaneous inversion of data in frequency domain and time domain can significantly improve the quality of interpretation.

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