This paper provides an explanation for the puzzling phenomenon in Tieslau et al. (1996, Journal of Econometrics 71, 249}264) that a substantial e$ciency loss occurs if low-order autocorrelations are omitted when estimating the di!erencing parameter, d. This is because for all n strictly bigger than 1, the nth-order autocorrelation function does not depend uniquely on the di!erencing parameter. ...

The semiclassical expression for the momentum autocorrelation function of a particle in a one-dimensional box is analyzed. The classical autocorrelation function is shown to be the first term of the semiclassical series. Systematical inclusion of all the terms restores quantum recurrence of the momentum autocorrelation function. 2005 Elsevier B.V. All rights reserved.

The fusion of Time-Correlated Single Photon Counting and Fluorescence Correlation Spectroscopy, called Fluorescence Lifetime Correlation Spectroscopy (FLCS), is a method that uses picosecond time-resolved fluorescence detection for separating different FCS-contributions. The main emphasis is on the word separating. FLCS does not involve fitting of a complicated model equation to a complicated a...