A statistical study is presented of (a) the frequency of narrow C iv λ1549 absorption lines in 1.5 < ∼ z < ∼ 3.6 radio-quiet and radio-loud quasars, and of (b) the UV and radio properties of the absorbed quasars. The quasar sample is unbiased with respect to absorption properties and the radio-quiet and radio-loud subsamples are well matched in redshift and luminosity. A similarly high incidenc...

After the discovery of electromagnetically induced absorption (EIA), both theoretical and experimental research was performed to explain not only the probe laser absorption and dispersion spectra, but also those of the coupling laser. The investigations of EIA in degenerate two-level systems have often been realized using two linearly polarized lasers of orthogonal polarization [1]. However, th...

Instead of conformation states of single residues, refined conformation states of quintuplets are proposed to reflect conformation correlation. Simple hidden Markov models combined with sliding window scores are used to predict the secondary structure of a protein from its amino acid sequence. Since the length of protein conformation segments varies within a narrow range, we can ignore the dura...

will be uncorrelated, since 〈ĉĉ〉 − 〈ĉ〉〈ĉ〉 = I. 〈ĉ〉 = Mc, so the new window function matrix will be M. However, whereas the window functions of the original power estimates (the rows of F) are always well-behaved (they are always non-negative, and are generally quite narrow, as shown in the top panel of Figure 1), there is no guarantee that the same will hold for the new window functions. As was...