15,389 research outputs found

    The Proof is in the Pudding: RWU Among Top 10 College Dining Halls

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    Once again, the Dining Commons and Bon Appetit are lauded for locally sourced ingredients and diverse selection of standout dishes

    Evolutionary Psychology

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    Multifluid magnetohydrodynamic turbulent decay

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    It is generally believed that turbulence has a significant impact on the dynamics and evolution of molecular clouds and the star formation which occurs within them. Non-ideal magnetohydrodynamic effects are known to influence the nature of this turbulence. We present the results of a suite of 512-cubed resolution simulations of the decay of initially super-Alfvenic and supersonic fully multifluid MHD turbulence. We find that ambipolar diffusion increases the rate of decay of the turbulence while the Hall effect has virtually no impact. The decay of the kinetic energy can be fitted as a power-law in time and the exponent is found to be -1.34 for fully multifluid MHD turbulence. The power spectra of density, velocity and magnetic field are all steepened significantly by the inclusion of non-ideal terms. The dominant reason for this steepening is ambipolar diffusion with the Hall effect again playing a minimal role except at short length scales where it creates extra structure in the magnetic field. Interestingly we find that, at least at these resolutions, the majority of the physics of multifluid turbulence can be captured by simply introducing fixed (in time and space) resistive terms into the induction equation without the need for a full multifluid MHD treatment. The velocity dispersion is also examined and, in common with previously published results, it is found not to be power-law in nature.Comment: 16 pages, 15 figures, Accepted for publication in Ap

    School Finance Reform and School Quality: Lessons from Vermont

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    In June of 1997, the elected leaders of Vermont enacted the Equal Educational Opportunity Act (Act 60) in response to a state supreme court decision in Brigham v. State. Act 60 could provide a unique opportunity to determine if dramatic school finance reforms like those enacted in Vermont generate greater equality in measured student performance. This paper represents an attempt to document the changes in the distributions of spending and of student performance that have occurred in the post-Act 60 period. This paper begins with an overview of the institutional structure of educational finance and provision in Vermont. One purpose of this overview is to make the argument that the Vermont case is particularly interesting because there have not been dramatic demographics changes that could obscure the impact of finance reforms. With this context established, I then use a panel of Vermont school districts that spans the pre- and post-Act 60 period to examine the extent to which there has been convergence across school districts in per pupil expenditures and in student performance. Spending has clearly converged; a definitive answer on the extent of convergence in student performance must wait until more years of data are available.
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