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A layered elastic theory approach to the calculation of the allowable load-carrying capacity and required overlay thickness of a pavement requires the values of the static elastic moduli of the pavement layers and the subgrade. A method is developed for determining the subgrade Young's modulus by vibratory nondestructive tests performed on the pavement surface. The response of pavements and subgrades to dynamic loadings is nonlinear, so that a nonlinear dynamic model of pavement response was developed by which the subgrade Young's modulus can be obtained from the measured dynamic pavement response data. The value of the subgrade Young's modulus predicted by vibratory nondestructive field tests was checked by laboratory dynamic resilient modulus tests. This was done by developing a nonlinear theory of the dynamic resilient modulus test by which the Young's modulus of the subgrade soil sample can be extracted from the resilient modulus test data. (Author)

1Home Life of Poe

By Susan Archer Weiss

The author of this biography of Poe, Susan Weiss, describes her work as follows: "I have not treated Poe in his character of poet or author, but confined myself to his private home-life, domestic and social, as I have heard it described by Poe's most intimate friends who knew him from infancy—some of them my own relatives—and from my own brief knowledge of him in the last three months of his life." - Summary by Ciufi Galeazzi