Principles of Radon transformation methods, including linear Radon transform in time domain, least square Radon transformation and high-resolution Radon transformation in frequency domain are discussed.
Recently Transient Electromagnetic Method (TEM), as a kind of time-domain electromagnetic prospecting approaches, has experienced a period of rapid development and been widely applied.
Principles of Radon transformation methods, including linear Radon transform in time domain, least square Radon transformation and high-resolution Radon transformation in frequency domain are discussed.
The wavelet in depth domain is extracted based on multitrace statistical extracting wavelet in time domain. Seismic decovolution profiles in depth domain are been compared with one in time domain.
The method of simultaneous inversion of multiple echo trains(SIMET) obtains fluids T 2 distribution and volume by using evolution matrix in the time domain.
Starting with the concept of the resolution of the hi-resolution seismic survey, systematicdiscussion on the relationship between the resolution and the signal-noise ratio and bandwidthand the effects on resolution is presented. Principle parameters and their mutual relation thatinfluence the resolution are analyzed from the time domain and the frequency domain,resulting in that the effective bandwidth and the center frequency are two controlling factorsto increase the resolution.
Our proofs proceed in the time domain and allow us to represent each solution regardless of the spectral radius of P(0):=2-s∑cα, which has been a difficulty in previous investigations of this nature.
In this paper, the global and local linear independence of any compactly supported distributions by using time domain spaces, and of refinable vectors by invariant linear spaces are investigated.
For the finite-difference time domain (FDTD) method, the electromagnetic scattering problem, which requires the characteristic structure size to be much smaller than the wavelength of the exciting source, is still a challenge.
The discrete spectrum of the field after continuation is obtained from difference methods for Maxwell's curl equations in frequency-domain, and the time domain solution of the original problem is derived from their inverse Fourier transform.
To circumvent this difficulty, this paper presents a novel hybrid numerical technique of combined difference and spectrum for time-domain Maxwell's equations.
Although the structure of frequency shift filter is more complicated than the time-domain filter, it uses both time correlations and frequency spectrum correlations so it can achieve better performances on separating the overlapping signals.
The modified TEM horn antenna with distributed resistor load is presented in this paper, and the radiation properties of the antenna with the shields and absorbers are studied through the three-dimensional finite-difference time-domain (FDTD) scheme.
The wind excitations of the system are the buffeting and self-excited forces simulated in time domain using measured aerodynamic coefficients and flutter derivatives.
Bypassing the disadvantages of traditional clustering (e.g., K-means or potential-function clustering), the durative-sparsity of a speech signal in time domain is used.
Our proofs proceed in the time domain and allow us to represent each solution regardless of the spectral radius of P(0):=2-s∑cα, which has been a difficulty in previous investigations of this nature.
The discrete spectrum of the field after continuation is obtained from difference methods for Maxwell's curl equations in frequency-domain, and the time domain solution of the original problem is derived from their inverse Fourier transform.
The natural excitation technique and the eigensystem realization algorithm were combined to identify the modal parameters in the time domain of a structure excited by simulated ambient vibrations.
In this paper, 80 magnetic storms during 1973-1977 are analyzed by means of the Fast Fourier Transform (FFT). The data were selected from the three observatories of Beijing, Qing Guang and Chang Li.It is get the general nature of the magnetic storm spectral components by the dispersion formula of FFT in some local areas. It is find the spectral features are nearly the same at the three observatories. The storm spectral amplitude decreases with increasing frequenecy and are linear in the logarithmic coordina...
Polarization analysis of three-component seismic records is a useful means for studying seismic waves, and is widely used to investigate the anisotropy and lateral heterogeneity of the earth medium.This paper presents a computer program POLALYS which,besides some data processing routines, performs polarization analysis by the single value decomposition (SVD) method in time or frequency domain, as well as by the conventional particle motion diagrams. The analyses of surface waves along four paths within cont...
The FDEM responses of 3D body are calculated by integral equation method, which can be changed into TDEM responses by inverse cosine tranform. To explain the sign reversals of TDEM responses in late time stage, Cole-Cole model which describes the character of frequency-diversity of resistivity of polarizable body are introduced into the direct calculation. It has been shown that IP effects on TDEM field are influenced by the the geometric, electrical and IP parameters.
时间域
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