The dynamical characteristics of ground soil and structure of frequency spectrum of ground micro-tremor in Fuzhou and Quanzhou of Fujian Province are studied in this thesis. The ground microtremor signals were observed, and the signals were analyzed by fast Fourier transform method (FFT).
The authors have studied 32 small earthquakes spectral variations before and after Yongdeng M S 5.8 earthquake on Jul.22, 1995,and the results show that P and S waves spectral peak frequency 、 corner frequency 、spectral peak value and absolute vacuum of high frequency spectral line oblique ratio have been obviously changed before and after the main shock,the authors can regard them as earthquake prediction index.
The comparison between the original and corrected well logging curves and their corresponding power spectral curves indicates that the corrected well logging curves are more effective than the original well logging curves in the resolution enhancement, because the corrected well logging curves eliminate part of the interferences from their neighboring strata and contain more frequency spectral components.
By means of frequency spectral analysis method,the authors use the Gamma ray curves of fluvial depositional system growing carbonaceous marsh to analyze the sedimentary cycle of Y2 member,Yan′an Formation in Longdong area,Ordos Basin,reaching that sedimentary cycles having stable thickness are conserved very well in the strata.
If these functions form an orthogonal basis for (Ω), when λ ranges over some subset Λ in ?d, then we say that (Ω, Λ) is a spectral pair, and that Λ is a spectrum.
In this work we obtain Paley-Wiener type theorems where the Fourier transform is replaced by transforms associated with self-adjoint operators on Ldμ2, with simple spectrum, where dμ is a Lebesgue-Stieltjes measure.
The notions of localization and related approximation properties are a spectrum of ideas that quantify the degree to which elements of one frame can be approximated by elements of another frame.
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 frequency spectrum of joint hydro-elastic vibrations of the ice surface of the ocean and liquid is analyzed taking into account the proper gravity field of Europa, one of Jupiter's moons.
The problem of determining the frequency spectrum is reduced to the solution of a boundary value problem for the eigenvalues, which can be solved analytically or numerically.
A high-frequency spectral break at k≥3 Mm-1 is associated with the characteristic telescope function; the position of the break and the spectral slope beyond the break do not reflect the turbulent state of the field.
The entangled state of atoms is found from which nonclassical light is generated with a steady-state phase and noise, which can be almost completely suppressed in the low-frequency spectral region.
A consistent radio-frequency spectral analysis demonstrates that the intensities of harmonics drastically change at the transparency region boundaries due to nonlinear interference.
The catculated results show that ratio of ky/kmax, site conditions, the amplitude and frequency content of the bedrock motion can affect the seismic permanent displacement of the landfill along liners in some degree.
In this paper we estimated the probability distribution of the dominant frequencies for the lightning during a total eclipse of the Sun,using the spectral data from 1 It was pointed out that the dominant frequencies may follow a Gaussian(or normal)distribution,and the reliable region of mean and rms for dominant frequencies are 8845 Hz,10381 Hz and 2485 Hz,3203 Hz respectively.
The analytical relations between the relative sunspot number and the solar radio flux density in the frequency range 1000 MHz≤f≤9400 MHz are given in this paper. These raletions are derived based on the methods of least squares, least percentage squares and compound least squares. The computed results show that the third order equation derived by the method of least percentage squares is the best regression equation. The solar quiet radio component obtained from this equation is consistent with the measurem...
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...
频谱
spectrum 
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