9,716 research outputs found

    Poemas

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    A NEW APPROACH TO NEUTRAL MONISM AND THE MIND-MATTER CONTROVERSY.

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    Neutral monism claims that both mind and matter are categories derived froma single underlying realit y that is univocally identified with none of them. In this paper atheoretical outline is presented from the neutral-monism perspective on the different configurations of reality referred to as “mind” and “matter”, while also discussing its consequences and the approaches it could give raise

    Adaptive reconstruction of radar reflectivity in clutter-contaminated areas by accounting for the space-time variability

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    Identification and elimination of clutter is necessary for ensuring data quality in radar Quantitative Precipitation Estimates (QPE). For uncorrected scanning reflectivity after signal processing, the removed areas have been often reconstructed by horizontal interpolation, extrapolation of non-contaminated PPIs aloft, or combining both based on a classification of the precipitation type. We present a general reconstruction method based on the interpolation of clutter-free observations. The method adapts to the type of precipitation by considering the spatial and temporal variability of the field provided by the multi-dimensional semivariogram. Six different formulations have been tested to analyze the gain introduced by each source of information: (1) horizontal interpolation, (2) vertical extrapolation, (3) extrapolation of past observations, (4) volumetric reconstruction, (5) horizontal and temporal reconstruction, and (6) volumetric and temporal reconstruction. The evaluation of the reconstructed fields obtained with the 6 formulations has been done (i) over clutter-free areas by comparison with the originally observed values, and (ii) over the real clutter-contaminated areas by comparison with the rainfall accumulations from a raingauge network. The results for 24 analyzed events (with a variety of convective and widespread cases) suggest that the contribution of extrapolation of past observations is not fundamental, and that the volumetric reconstruction is the one that overall adapted the best to the different situations.Peer ReviewedPostprint (author’s final draft

    Asymptotics for Lipschitz percolation above tilted planes

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    We consider Lipschitz percolation in d+1d+1 dimensions above planes tilted by an angle γ\gamma along one or several coordinate axes. In particular, we are interested in the asymptotics of the critical probability as dd \to \infty as well as γπ/4.\gamma \to \pi/4. Our principal results show that the convergence of the critical probability to 1 is polynomial as dd\to \infty and γπ/4.\gamma \to \pi/4. In addition, we identify the correct order of this polynomial convergence and in d=1d=1 we also obtain the correct prefactor.Comment: 23 pages, 1 figur

    Summability of stochastic processes: a generalization of integration and co-integration valid for non-linear processes

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    The order of integration is valid to characterize linear processes; but it is not appropriate for non-linear worlds. We propose the concept of summability (a re-scaled partial sum of the process being Op(1)) to handle non-linearities. The paper shows that this new concept, S (d): (i) generalizes I (d); (ii) measures the degree of persistence as well as of the evolution of the variance; (iii) controls the balancedness of non-linear relationships; (iv) opens the door to the concept of co-summability which represents a generalization of co-integration for non-linear processes. To make this concept empirically applicable, an estimator for d and its asymptotic properties are provided. The finite sample performance of subsampling confidence intervals is analyzed via a Monte Carlo experiment. The paper finishes with the estimation of the degree of summability of the macroeconomic variables in an extended version of the Nelson-Plosser database.Co-integration, Co-summability, Integrated processes, Non-linear balanced relationships, Non-linear processes, Summability

    The effective strength of selection in random environment

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    We analyse a family of two-types Wright-Fisher models with selection in a random environment and skewed offspring distribution. We provide a calculable criterion to quantify the impact of different shapes of selection on the fate of the weakest allele, and thus compare them. The main mathematical tool is duality, which we prove to hold, also in presence of random environment (quenched and in some cases annealed), between the population's allele frequencies and genealogy, both in the case of finite population size and in the scaling limit for large size. Duality also yields new insight on properties of branching-coalescing processes in random environment, such as their long term behaviour.Comment: 36 pages; v2 corrects an error in the proof of Thm 3.

    Success Factors in Peer-to-Business (P2B) Crowdlending: A Predictive Approach

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    Peer-to-Business (P2B) crowdlending is gaining importance among companies seeking funding. However, not all projects get the same take-up by the crowd. Thus, this study aims to determine the key factors that drive non-professional investors to choose a given loan in an online environment. To this purpose, we have analyzed 243 crowdlending campaigns on October.eu platform. We have obtained a series of variables from the analyzed loans using logistic regression. Results indicate that loan amount, loan term and overall credit rating are the key predictors of non-professional lender P2B crowdlending success. These findings may be useful for predicting whether the crowd will subscribe to a loan request or not. This information would help businesses to modify specific loan characteristics (if possible) to make their loans more attractive or could even lead companies to consider a different financial option. It could also help platforms select and adapt project parameters to secure their success
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