Sentence examples for spectra of background from inspiring English sources
The chemical composition of the gas phase of the interstellar medium alone, without regard to the solid dust, can be determined from the strength of narrow absorption lines that are produced by the gas in the spectra of background stars.
The forest of absorption line systems observed in the spectra of background QSOs offers a sensitive probe of tenuous gas in extended halos around galaxies as well as in intergalactic medium.
Practically, the upper limit at a given station will depend on the spectra of background noise for the horizontal and vertical components as well as the magnitude of the parameters (alpha_{text{H}}), (beta_{text{H}}) and (eta).
This class of over 300 interstellar absorption bands seen in the spectra of background stars have too broad a profile to be due to atomic lines, and are most likely of molecular or solid-state origin.
The calibrated time series was the real part of the inverse fast Fourier transform of HSI (Fig. 5). Figure 6a shows typical band-averaged amplitude spectra of background geomagnetic activity recorded on the QuakeFinder ANT4 north south sensor at various times throughout the day.
Because the power spectra of behaviorally relevant stimuli typically decrease with increasing modulation (or temporal) frequency while the power spectra of background noises are relatively flat (see figure 1 and Singh and Theunissen [33]), the SNR of the combined behaviorally relevant and background noise stimuli decreases with increasing temporal frequency.
Red line indicates the amplitude spectrum of background data produced by MC calculation (virtual data).
Red line indicates amplitude spectrum of background data produced by MC calculation (virtual data).
It is apparent that 0≤C r (fD)≤1, and the criterion amplifies the weak Doppler spectrum of moving target and suppresses the strong Doppler spectrum of background.
where (widehat {B}_{l}(mu,k)) is the estimated magnitude spectrum of background noise for each microphone, δ inc is the incremental constant, and δ dec is the decremental constant, with 0≪δ dec<1<δ inc.
fd2 := fdc2+n·fPRF/2; Δ f m, n = f d 2 0 − f d 2 ; end for [n]; end for [m]; 4: Find the minimum value from {Δfm,n}, and get the corresponding index m ̂ and n ̂ ; From Figure 4, we see that a target which moves at low speed in range direction may result in the superposition between the Doppler spectrum of background and that of the moving target.
