A Study of the Propagation of Stress Waves in Sand

Abstract

It Is a pleasure to acknowledge the patient guidance offered by Dr. Eugene Zwoyer, Director of the Eric H. Wang Civil Engineering Research Facility where the work was performed. Dr. George E. Trlandafilldls, Supervisor of Soil Dynamics Research at the facility, was of inestimable help In his review of the work, and his editing of the drafts. Messrs. W.J. Baker and P.M. Babcock, Research Engineers at the facility, assisted greatly in both the experimental and theoretical work. Messrs. Robert Fä.sher and Bert Wilkinson designed and assembled the experimental equipment, and performed many of the tests. The assistance of other personnel at the facility was inviluable and is gratefully acknowledged. This report has been reviewed and is approved.

The Comprehension of Pronominal Reference in Children

“…A prevalent assumption underlying most studies on children's grammatical development is that children's sentences involve grammatical categories that are combined by structure dependent rules. This assumption is found both in studies on early syntax, e.g., McNeill (1966), and in speculations on the nature of Language Acquisition Device, Chomsky (1975). While we are not questioning the existence of Universal Grammar in some form, we raise the issue of how the child goes about accessing it.…”

Investigating Effects of End Platens on Stresses in Soil During Consolidation

“…He concluded that the one‐dimensional theory of rods can be used, without significant error, if the wavelength of the propagating waves is significantly larger than the diameter of the rod. McNeil 4 also states if the wavelength to diameter ratio is greater than 2.5, the one‐dimensional theory can be validated. The standard resonant column specimen is constructed to meet this criterion.…”