Acoustic suspension system

An acoustic levitation system is described, with single acoustic source and a small reflector to stably levitate a small object while the object is processed as by coating or heating it. The system includes a concave acoustic source which has locations on opposite sides of its axis that vibrate towards and away from a focal point to generate a converging acoustic field. A small reflector is located near the focal point, and preferably slightly beyond it, to create an intense acoustic field that stably supports a small object near the reflector. The reflector is located about one-half wavelength from the focal point and is concavely curved to a radius of curvature (L) of about one-half the wavelength, to stably support an object one-quarter wavelength (N) from the reflector

International R&D Transfer and Technical Efficiency: Evidence from Panel Study Using Stochastic Frontier Analysis

We study the effect of foreign research and development (R&D) transferred through imports and foreign direct investment (FDI) on domestic technical efficiency using stochastic frontier analysis. Unbalanced panel results from a 77-country sample over 1986–2007 show that FDI- and imports-transferred foreign R&D have a significant impact on domestic country’s technical efficiency. Furthermore, we observe a complementarity between FDI-transferred R&D and domestic human capital. In other words, the domestic country needs to obtain a threshold level of human capital to benefit from FDI-transferred R&D. Other macro conditions such as infrastructure, political stability, and urbanization also help to improve the technical efficiency of a country

Leisure and Happiness in the U.S.: Evidence from Survey Data

We study the relationship between leisure and happiness, controlling for income and other determinants. Using survey data for the United States in 2007, our results show that certain aspects of leisure, such as leisure activity satisfaction, have a significant impact on individual well-being whereas the amount of leisure time may not play an important role in affecting happiness

Learning Dynamics in Monetary Policy: The Robustness of an Aggressive Price Stabilizing Policy

This paper investigates the effect of an aggressive inflation stabilizing monetary policy on the ability of agents to reach a rational expectations equilibrium for inflation and output. Using an adaptive learning framework, we develop a model that combines a real wage contracting rigidity with an interest rate rule. We show that an AR(1) equilibrium requires more aggressive monetary policy to achieve both determinacy and learnability. This model and policy findings contrast with Bullard and Mitra’s [Determinacy, learnability and monetary policy inertia (2001); Journal of Monetary Economics 49 (2002) 1105] model (no inflation persistence) and policy findings (less aggressive policy). These results suggest that aggressive policy is robust in different model specifications

Information Diffusion in a Cobweb World

Based on an assumption of one-way learning, Granato and Wong (2004) consider a framework with two groups of agents, Group L and Group H, where Group L is less attentive and uses the expectations of the more or highly attentive Group H to update their forecasts. The paper shows the boomerang effect, which is defined as a situation where the inaccurate forecasts of a less attentive group confound a more attentive group\u27s forecasts. This extended paper relaxes the one-way learning assumption and investigates the case that both groups are learning from each other, i.e., dual learning. Simulations suggest that a boomerang effect still exists. Surprisingly, although the highly attentive group has a full set of information to make forecasts, they still learn from Group L. The reason is that Group H adjusts their forecasts because there is available information in Group L\u27s forecast measurement error