An extensive cross section database for the electron-impact inelastic processes of vibrationally excited molecules of hydrogen and its isotopes is presented. The following inelastic processes are covered: electronic excitation (dissociative and nondissociative), direct ionization (dissociative and nondissociative), excitationradiative decay vibrational excitation and dissociation, and dissociat...

In the course of normal aging from about age 20 to 100, the population density of neocortical synapses declines toward, but not reaching, the level found in Alzheimer disease. A deficiency of synapses at birth or due to inadequate childhood education would theoretically cause the synaptic slope to reach the Alzheimer level early. The normal slope would cross into that dementia range at about ag...

Lettau and Ludvigson (2001) find that the consumption-wealth ratio (cay) constructed from revised data is a strong predictor of stock market returns. This paper shows that its out-ofsample forecasting power becomes substantially weaker if cay is estimated using information available at the time of forecast. The difference, which mainly reflects periodic revisions in consumption and labor income...