Thick transducers used for generating short-duration stress pulses in thin specimens

By generating short stress pulses with thick transducers, the pulse-echo method for determining sound velocities and acoustic attenuation can be applied to thin specimens. The stress pulses enter a specimen where one pulse is reflected several times before a succeeding pulse enters the specimen

Incentives in competitive search equilibrium

This paper analyses the interaction between internal agency problems within firms and external search frictions when workers have private information. We show that the allocation of resources is determined by a modified Hosios Rule. We then analyze the effect of changes in the macro economic variables on the wage contract and the unemployment rate. We find that private information may increase the responsiveness of the unemployment rate to changes in productivity. The incentive power of the wage contracts is positively related to high productivity, low unemployment benefits and high search frictions

American Influence in the International Financial Institutions

As the world becomes more globalized and the prosperity of new, rising powers begins to challenge that of long-standing powers, many scholars and policy-makers have begun to examine America’s place in the global political economy. Ongoing changes in the world politi­cal economy such as the flourishing economies in the BRICS countries (Brazil, Russia, India, China, and South Africa), continued integration in Europe, as well as questions about eco­nomic policies derived from American dominated neoliberal ideology have raised many doubts regarding how long the United States can remain the world leader. The conventional wisdom holds that the United States has enough influence in these international organizations to both pass items the U.S. supports and block items that it opposes. This broader context of influence within international financial institutions leads to the more specific research question addressed in this study: is the United States able to block loans and other items that it does not support? This empirical analysis raises doubts about the prevailing ideas about American influence in these important multilateral banks. Through this combined data and analysis, the study is able to address where the U.S. stands with its influence in the MDBs and the World Bank

Incentives in Competitive Search Equilibrium

This paper analyses the interaction between internal agency problems within firms and external search frictions when workers have private information. We show that the allocation of resources is determined by a modified Hosios Rule. We then analyze the effect of changes in the macro economic variables on the wage contract and the unemployment rate. We find that private information may increase the responsiveness of the unemployment rate to changes in productivity. The incentive power of the wage contracts is positively related to high productivity, low unemployment benefits and high search frictions.Private information, incentives, search, unemployment, wage rigidity

Development of design allowable data for Celion 6000/LARC-160, graphite/polyimide composite laminates

A design allowables test program was conducted on Celion 6000/LARC-160 graphite polyimide composite to establish material performance over a 116 K (-250 F) to 589 K (600 F) temperature range. Tension, compression, in-plane shear and short beam shear properties were determined for uniaxial, quasi-isotropic and + or - 45 deg laminates. Effects of thermal aging and moisture saturation on mechanical properties were also evaluated. Celion 6000/LARC-160 graphite/polyimide can be considered an acceptable material system for structural applications to 589 K (600 F)

Promises, Promises: The States' Experience With Income Tax Indexing

The paper discusses five early approaches to the price (and quantity) index number problem. The five approaches are: (1) the fixed basket approach; (ii) the statistical approach; (iii) the test or axiomatic approach; (iv) the Divisia approach and (v) the economic approach. The economic approach makes use of the assumption of optimizing behavior under constraint and the approach is discussed under four subtopics: (i) basic theoretical definitions; (ii) the theory of bounds; (iii) exact index numbers and (iv) econometric estimation of preferences. The paper also discusses several topics raised by Jack Triplett in a recent paper, including: (i) the merits of the test approach to index number theory, (ii) the chain principle and alternatives to it; (iii) the substitution bias and (iv) the new good bias. Although the paper is for the most part an extensive historical survey, there are a few new results in section 8 on multilateral alternatives to the chain principle. Also in section 6.3, it is shown that the Paasche, Laspeyres and all superlative indexes will satisfy the circularity test to the first order.

State Personal Income and Sales Taxes: 1977-1983

The two main workhorses of state tax systems are levies on sales and individual incomes. In this paper we develop and implement a coherent methodology for characterizing these systems. The measures thus generated are used to show how the various systems differ across states, and how they evolved over the seven year period 1977-1983. We consider the systems' revenue elasticities with respect to income, average and marginal tax rates at various income levels, and several other issues as well.

Recent Developments in the Marriage Tax

The new tax law increases tax rates of high income individuals, and expands the earned income tax credit for low income individuals. We use a sample of actual tax returns to compute estimates of the 'marriage tax' - the change in couples joint tax upon marriage - under this new law. We predict that in 1994 52 percent of American couples will pay a marriage tax, with an average of about $1,244; 38 percent will receive a subsidy averaging about$1,399. These aggregate figures mask a considerable amount of dispersion in the population. Under the new law, the marriage tax for certain low-income families can exceed $3,000 annually; for certain very high income families it can exceed$10,000 annually.