Lian Shi Du

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A multistep iterative and fast recursive algorithm for ARMA spectral estimation is presented. The AR parameters of an ARMA process are estimated using the extended instrumental variable (EIV) method, The optimal choice of instruments, prefilter, and weighting matrix is investigated. A bootstrapping procedure of the algorithm is proposed which has(More)
Negative cross-peaks have been observed in the (19)F 2-D magnetization-exchange MAS NMR spectra of Ba(2)MoO(3)F(4) under fast-spinning conditions. The polarization transfer dynamics are studied as a function of the spinning frequency and the frequency separation of the resonances. The results are consistent with a novel mechanism, in which four spins(More)
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