THE WORLD FOOD CRISIS--PERIODIC OR PERPETUAL?

Food Security and Poverty,

U.S. AGRICULTURAL POLICY AND WORLD TRADE

International Relations/Trade,

EVALUATION OF AGRICULTURAL PROGRAMS IN TERMS OF ECONOMIC GROWTH, FOREIGN TRADE, AND POLITICAL FEASIBILITY: A GENERAL APPRAISAL

Agricultural and Food Policy,

FOREIGN TRADE--IS THE CRUNCH COMING?

International Relations/Trade,

GROUP DISCUSSION OF THE ALTERNATIVES FOR ECONOMIC COOPERATION

Institutional and Behavioral Economics,

A Bonanza of Birthday Bewilderments

The birthday problem is a popular probability conundrum at least partially because of the apparent counterintuitive result. But the results are not unexpected if the number of opportunities is considered. This article uses the opportunities approach to solve several variations of the birthday problem

Graphic Violence

Statistical graphs are everywhere, yet they are one of the most common places for misinformation. Numerous graphical displays are presented that misrepresent the data. Included are issues like missing baselines, squaring the effect, and hidden bias in graphs

Unsteady flows in a single-stage transonic axial-flow fan stator row

Detailed measurements of the unsteady velocity field within the stator row of a transonic axial-flow fan were acquired using a laser anemometer. Measurements were obtained on axisymmetric surfaces located at 10 and 50 percent span from the shroud, with the fan operating at maximum efficiency at design speed. The ensemble-average and variance of the measured velocities are used to identify rotor-wake-generated (deterministic) unsteadiness and turbulence, respectively. Correlations of both deterministic and turbulent velocity fluctuations provide information on the characteristics of unsteady interactions within the stator row. These correlations are derived from the Navier-Stokes equation in a manner similar to deriving the Reynolds stress terms, whereby various averaging operators are used to average the aperiodic, deterministic, and turbulent velocity fluctuations which are known to be present in multistage turbomachines. The correlations of deterministic and turbulent velocity fluctuations throughout the axial fan stator row are presented. In particular, amplification and attenuation of both types of unsteadiness are shown to occur within the stator blade passage

Food Prices and Inflation

macroeconomics, inflation, food prices