Experimental investigation of the mixing of two parallel streams of dissimilar fluids

Velocity and density profiles in mixing region between adjacent half jets of dissimilar fluid

What Role for Empirics in International Trade?

In the field of international trade, data analysis has traditionally had quite modest influence relative to that of pure theory. At one time, this might have been rationalized by the paucity of empirics in the field or its weak theoretical foundations. In recent years empirical research has begun to provide an increasingly detailed view of the determinants of trade relations. Yet the field as a whole has been slow to incorporate these findings in its fundamental worldview. In this paper, we outline and extend what we view as key robust findings from the empirical literature that should be part of every international economists working knowledge.

Technological Superiority and the Losses from Migration

Two facts motivate this study. (1) The United States is the world's most productive economy. (2) The US is the destination for a broad range of net factor inflows: unskilled labor, skilled labor, and capital. Indeed, these two facts may be strongly related: All factors seek to enter the US because of the US technological superiority. The literature on international factor flows rarely links these two phenomena, instead considering one-at-a-time analyses that stress issues of relative factor abundance. This is unfortunate, since the welfare calculations differ markedly. In a simple Ricardian framework, a country that experiences immigration of factors motivated by technological differences always loses from this migration relative to a free trade baseline, while the other country gains. We provide simple calculations suggesting that the magnitude of the losses for US natives may be quite large $72 billion dollars per year or 0.8 percent of GDP.

Market Size, Linkages, and Productivity: A Study Of Japanese Regions

markets, regions, productivity

Do Endowments Predict the Location of Production? Evidence from National and International Data

Examining the relationship between factor endowments and production patterns using international and Japanese regional data, we provide the first empirical confirmation of Ethier's correlation approach to the Rybczynski theorem. Moreover, we find evidence of substantial production indeterminacy. Prediction errors are six to thirty times larger for goods traded relatively freely. A compelling explanation of this phenomenon is the existence of more goods than factors in the presence of trade costs. This result implies that regressions of trade or output on endowments have weak theoretical foundations. Furthermore, since errors are largest in data sets where trade costs are small, we explain why the common methodology of imputing trade barriers from regression residuals often leads to backwards results.

Non-perturbative effective model for the Higgs sector of the Standard Model

A non-perturbative effective model is derived for the Higgs sector of the standard model, described by a simple scalar theory. The renormalized couplings are determined by the derivatives of the Gaussian Effective Potential that are known to be the sum of infinite bubble graphs contributing to the vertex functions. A good agreement has been found with strong coupling lattice simulations when a comparison can be made

A test of adverse selection in the market for experienced workers

We show that in labor market models with adverse selection, otherwise observationally equivalent workers will experience less wage growth following a period in which they change jobs than following a period in which they do not. We find little or no evidence to support this prediction. In most specifications the coefficient has the opposite sign, sometimes statistically significantly so. When consistent with the prediction, the estimated effects are small and statistically insignificant. We consistently reject large effects in the predicted direction. We argue informally that our results are also problematic for a broader class of models of competitive labor markets.Othe

Hot-wire anemometry in hypersonic helium flow

Hot-wire anemometry techniques are described that have been developed and used for hypersonic-helium-flow studies. The short run time available dictated certain innovations in applying conventional hot-wire techniques. Some examples are given to show the application of the techniques used. Modifications to conventional equipment are described, including probe modifications and probe heating controls

Mesoscale structure of 11-20 km winds

Wind speed and direction profiles by tracking spherical superpressure balloon

Does Economic Geography Matter for International Specialization?

There are two principal theories of why countries trade: comparative advantage and increasing returns to scale. Yet there is no empirical work that assesses the relative importance of these two theories in accounting for production structure and trade. We use a framework that nests an increasing returns model of economic geography featuring home market effects with that of Heckscher-Ohlin-Vanek. We employ these trade models to account for the structure of OECD manufacturing production. The data militate against the economic geography framework. Moreover, even in the specification most generous to economic geography, endowments account for 90 percent of the explainable variance, economic geography but 10 percent.