Finally,the gradient vectors of as-sociated problems are expressed as model parameters(Lame coefficient,wave veloci-ty and density)in tirnesispace and frequency domains, and the estimated solution ex-pressions are also given here.
On the basis of frequency-division processing method in wavelet domain, a new technique is put forward, which involves 1) designing filter operators equivalent to deconvolution operator in time and frequency domains in wavelet transform, 2) obtaining derivative wavelet function that is suitable to high-resolution seismic data processing, and 3) processing high resolution seismic data by deconvolution method in time domain.
Theoretical calculate and real data processing show the method can depress noise in both time and frequency domains, spread out the effective frequency band, and improve the resolution factor.
In this paper we discuss details about the construction of 3 D wave equation pre stack depth migration algorithm in shot gathers by combining migration operators of frequency wavenumber domain and spatial frequency domain, and its corresponding processing flow.
We present an explicit, straightforward construction of smooth integrable functions with prescribed gaps around the origin in both time and frequency domain.
In this paper we give a further investigation of the method introduced by the author in [1, Frequency-domain bounds for nonnegative unsharply band-limited functions] for proving bounds for functions with nonnegative Fourier transforms.
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.
Different types of tomography, such as continuous wave (CW), frequency-domain (FD), and time-domain (TD) tomography, allow fluorescence imaging of tumors located deep in human or animal tissue.
A comparison of the results obtained in the time and frequency domains gives evidence that the energies of thermal and coherent phonons coincide, while their dephasing and energy relaxation times are different.
Dispersion relations for the surface wave are derived for different field polarizations, and the frequency domains where this wave may exist are found.
A method utilizing single channel recordings to blindly separate the multicomponents overlapped in time and frequency domains is proposed in this paper.
From both the theoretical analysis and real data validation, it is concluded that target echo and RFI have different Region Of Support (ROS) in 2-D fast-time wavenumber and aperture wavenumber domain.
The phase shift operation is implemented in the wavenumber domain while the time delay for lateral velocity variation is corrected in the spatial domain.
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...
Using the frequency method, the source parameters of small earthquakes from the end of 1990 to June, 1993 in the Capital Circle Area and the quality factor of the medium along the corresponding paths have been determined. The short period analog seismic signals teletransmitted from seismic wave data were obtained through computer online processing system, operated by the Seismometry Data Transmission and Processing for Seismicity Monitoring in the Beijing, Tianjin, Tangshan and Zhangjiakou Region, Center fo...
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...
频率域
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