To generate big responses of unemployment to productivity shocks in a business cycle context or to productivity changes in a welfare state context, researchers have reconfigured matching models in various ways, e.g., by elevating the utility of leisure, by making wages sticky, by assuming alternating-offer wage bargaining, by introducing fixed matching costs, and the costly acquisition of credi...

This paper investigates factors that degrade the precision of image registration based on phase correlation. The major sources of error are interpolation error and rotationally dependent aliasing. The latter error stems from the fact that the discrete-Fourier transform does not commute with the rotation of sampled-images, whereas in the continuous domain the corresponding operations do commute....

The scaling exponent of a 1/ f noise time series is commonly estimated from the power-law slope of its Fourier power spectrum. Here I show that because 1/ f noises typically have significant power above the Nyquist frequency, measurements of their power spectra will often be severely distorted by aliasing, not only near the Nyquist frequency, but also far below it. I show that spectral aliasing...