86,866 research outputs found

    Immigrant-Native Substitutability: The Role of Language Ability

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    Wage evidence suggests that immigrant workers are imperfectly substitutable for native-born workers with similar education and experience. Using U.S. Censuses and recent American Community Survey data, I ask to what extent differences in language skills drive this. I find they are important. I estimate that the response of immigrants’ relative wages to immigration is concentrated among immigrants with poor English skills. Similarly, immigrants who arrive at young ages, as adults, both have stronger English skills and exhibit greater substitutability for native-born workers than immigrants who arrive older. In U.S. markets where Spanish speakers are concentrated, I find a “Spanish-speaking” labor market emerges: in such markets, the return to speaking English is low, and the wages of Spanish and non-Spanish speakers respond most strongly to skill ratios in their own language group. Finally, in Puerto Rico, where almost all workers speak Spanish, I find immigrants and natives are perfect substitutes. The implications for immigrant poverty and regional settlement patterns are analyzed.

    Further evidence of the absence of Replica Symmetry Breaking in Random Bond Potts Models

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    In this short note, we present supporting evidence for the replica symmetric approach to the random bond q-state Potts models. The evidence is statistically strong enough to reject the applicability of the Parisi replica symmetry breaking scheme to this class of models. The test we use is a generalization of one formerly proposed by Dotsenko et al. and consists in measuring scaling laws of disordered-averaged moments of the spin-spin correlation functions. Numerical results, obtained via Monte Carlo simulations for several values of q, are shown to be in fair agreement with the replica symmetric values computed by using perturbative CFT for the second and third moments of the q=3 model. RSB effects, which should increase in strength with moment, are unobserved.Comment: 7 pages, some minor modifications (mainly misprints). To Appear in Europhysics Letter

    Overall and blade element performance of a 1.20 pressure ratio fan stage with rotor blades reset -7 deg

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    A 51-cm-diam model of a fan stage for short haul aircraft was tested in a single stage compressor research facility. The rotor blades were set 7 deg toward the axial direction (opened) from the design setting angle. Surveys of the air flow conditions ahead of the rotor, between the rotor and stator, and behind the stator were made over the stable operating range of the stage. At the design speed and a weight flow of 30.9 kg/sec, the stage pressure ratio and efficiency were 1.205 and 0.85, respectively. The design speed rotor peak efficiency of 0.90 occurred at a flow rate of 32.5 kg/sec
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