Acoustic pulse propagation requires the inclusion of attenuation and its causal companion, dispersion when propagation is through a non-ideal fluid medium. For acoustic propagation in a linear medium, Szabo [T.L. Szabo, J. Acoust. Soc. Am., 96 (1994) 491–500] introduced the concept of a...

The Bush administration has proposed major changes in federal funding mechanisms for state agricultural experiment station research. The objective of this article is to examine winners and losers from proposed changes in the proportions of federal-formula versus competitive grant funding of...

This paper briefly presents the results of a total factor productivity (TFP) study of South African commercial agriculture, for 1947-1997, and illustrates some potential pitfalls in rate of return to research (ROR) calculations. The lag between R&D and TFP is analyzed and found to be only 9...