14,280 research outputs found

    Cruise Report 73-KB-31: Abalone investigations

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    The status of the California Barracuda resource and its management

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    The California barracuda, Sphyraena argentea, has been fished commercially for over 70 years. Peak landings were made during the early 1920's and have since declined to an incidental level. The present interest in barracuda centers around its desirability as a game species. Recent estimates of barracuda abundance indicate the population is at a low level and in need of increased management efforts. (21pp.

    Pre-cruise report 72-KB-19: Big game fisheries investigations

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    Has the Phillips Curve Shifted? Some Additioal Evidence

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    macroeconomics,Phillips Curve

    Induced gelation in a two-site spatial coagulation model

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    A two-site spatial coagulation model is considered. Particles of masses mm and nn at the same site form a new particle of mass m+nm+n at rate mnmn. Independently, particles jump to the other site at a constant rate. The limit (for increasing particle numbers) of this model is expected to be nondeterministic after the gelation time, namely, one or two giant particles randomly jump between the two sites. Moreover, a new effect of induced gelation is observed--the gelation happening at the site with the larger initial number of monomers immediately induces gelation at the other site. Induced gelation is shown to be of logarithmic order. The limiting behavior of the model is derived rigorously up to the gelation time, while the expected post-gelation behavior is illustrated by a numerical simulation.Comment: Published at http://dx.doi.org/10.1214/105051605000000755 in the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org

    Some Macro Foundations for Micro Theory

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    macroeconomics, micro theory

    Falling Profits, Rising Profit Margins, and the Full-Employment Profit Rate

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    macroeconomics, profit margins, profit rate

    An Ergodic Theorem for the Quantum Relative Entropy

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    We prove the ergodic version of the quantum Stein's lemma which was conjectured by Hiai and Petz. The result provides an operational and statistical interpretation of the quantum relative entropy as a statistical measure of distinguishability, and contains as a special case the quantum version of the Shannon-McMillan theorem for ergodic states. A version of the quantum relative Asymptotic Equipartition Property (AEP) is given.Comment: 19 pages, no figure

    Organic and alike farming in Latin America: state and relevance for small-scale livestock keepers

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    While the organic movement is growing, its contribution to small-scale livestock farm-ing in Latin America is contentious. Secondary literature and available statistics were used for this study. Farms and area under certified organic agriculture are rising, but small-scale livestock farming is little represented. The latter is yet to be found in non-certified organic-like farms, offering locally adapted paths to securing livelihoods
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