32,133 research outputs found

    Limiting the Collective Right to Exclude

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    For decades, society’s disparate interests and priorities have stymied attempts to resolve issues of housing affordability and equity. Zoning law and servitude law, both of which have been robustly empowered by decades of jurisprudence, effectively grant communities the legal right and ability to exclude various sorts of residences from their wealthiest neighborhoods. Exclusion by housing type results in exclusion of categories of people, namely, renters, the relatively poor, and racial minorities. Although our society’s housing woes may indeed be intractable if we continue to treat a group’s right to exclude with the level of deference that such exclusionary efforts currently enjoy, this treatment is unjustifiable. Courts should acknowledge and consider the broad public and private costs that are created by a group’s unfettered right to exclude. A more balanced approach would weigh individual autonomy to control property and various public harms resulting from community exclusions against legitimate community needs to exclude certain residents and uses. Judicial limits of the collective right to exclude may enable real progress toward fair and affordable housing to be achieved at last

    Jamming Mechanisms and Density Dependence in a Kinetically-Constrained Model

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    We add relaxation mechanisms that mimic the effect of temperature and non-equilibrium driving to the recently-proposed spiral model which jams at a critical density rho_c < 1. This enables us to explore unjamming by temperature or driving at rho_c < rho < 1. We numerically calculate the relaxation time of the persistence function and its spatial heterogeneity. We disentangle the three different relaxation mechanisms responsible for unjamming when varying density, temperature, and driving strength, respectively. We show that the spatial scale of dynamic heterogeneity depends on density much more strongly than on temperature and driving

    A model of dispersive transport across sharp interfaces between porous materials

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    Recent laboratory experiments on solute migration in composite porous columns have shown an asymmetry in the solute arrival time upon reversal of the flow direction, which is not explained by current paradigms of transport. In this work, we propose a definition for the solute flux across sharp interfaces and explore the underlying microscopic particle dynamics by applying Monte Carlo simulation. Our results are consistent with previous experimental findings and explain the observed transport asymmetry. An interpretation of the proposed physical mechanism in terms of a flux rectification is also provided. The approach is quite general and can be extended to other situations involving transport across sharp interfaces.Comment: 4 pages, 4 figure

    Weed control strategies in organically grown carrots

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    This paper outlines a study to integrate elements of cultural, thermal and mechanical control methods in the production of late maincrop drilled organic carrots. Agronomic and economic findings are discusse
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