Vibration-Induced Conductivity Fluctuation (VICOF) Testing of Soils

In this Letter, we propose and experimentally demonstrate a simple method to provide additional in-formation by conductivity measurements of soils. The AC electrical conductance of the soil is measured while it is exposed to a periodic vibration. The vibration-induced density fluctuation implies a corresponding conductivity fluctuation that can be seen as combination frequency components, the sum and the difference of the mean AC frequency and the double of vibration frequency, in the current response. The method is demonstrated by measurements on clayey and sandy soils

Reasoning with Partial Knowledge

We investigate how sociological argumentation differs from the classical first-order logic. We focus on theories about age dependence of organizational mortality. The overall pattern of argument does not comply with the classical monotonicity principle: adding premises does not overturn conclusions in an argument. The cause of nonmonotonicity is the need to derive conclusions from partial knowledge. We identify meta-principles that appear to guide the observed sociological argumentation patterns, and we formalize a semantics to represent them. This semantics yields a new kind of logical consequence relation. We demonstrate that this new logic can reproduce the results of informal sociological theorizing and lead to new insights. It allows us to unify existing theory fragments and paves the way towards a complete classical theory

The Strawberry Growth Underneath the Nettle: the emergence of entrepreneurs in China

Chinese entrepreneurs innovatively manage organisations in the absence of strong economic institutions, under conditions of high environmental and technological uncertainty. This paper presents the findings of an empirical study designed to investigate how Chinese entrepreneurs can be successful in such an environment. We found that Chinese entrepreneurial activity relies on social institutions rather than on economic institutions. We offer a sociological theory which explains why the reliance on social institutions leads to such an unprecedented success. We conclude that the strong rule-enforcement mechanisms generate reliable behavioral patterns, and that these in turn efficiently reduce uncertainty to tolerable levels

Power allocation of multi-rate transmissions over a jammed broadcast channel

Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.Includes bibliographical references (leaf 40).by John L. Benko.S.B.and M.Eng