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Performance of a Double Catalyst Fuel Cell Cathode with a Tubular Oxygen Breathing and Preliminary Reduction Zone

Journal of Thermal Science 2005年第2期14卷 187-192页

作者： Luís A.Waack BAMBACE Miriam NISHIMORI Fernando M.RAMOS demétrio bastos-netto Instituto Nacional de Pesquisas Espaciais-INPE Av.Dos Astronautas 1758 S■o José dos CamposSPBrazilCEP 12210-970Instituto Nacional de Pesquisas Espaciais-INPE Av.Dos Astronautas 1758S■o José dos CamposSPBrazilCEP 12210-970Instituto Nacional de Pesquisas Espaciais-INPE Av.Dos Astronautas 1758S■o José dos CamposSPBrazilCEP 12210-970Instituto National de Pesquisas Espaciais-INPE Rod.Presidente Dutra km 40Cachoeira PaulistaSPBrazil CEP12630-000

This paper discusses a mathematical model for a liquid phase reacting flow occurring at the cathode of a patent pending novel fuel cell geometry, where a non homogeneous catalysis carried by gold and Prussian Blue, with the first reducing air O2 and the second the resulting H2O2. The breathing zone is porous walls microtubes, with three different types of pores in its walls. Inside the microtubes there is water solution of sulfuric acid. The microtubes possess an external layer of extremely porous polymer hydrophobic agent. A Prussian Blue thin porous layer is over the selective membrane. Appropriate porous and tubular connecting elements close the fluid loop. The asymmetry induces proper current and electric potential profiles, which leads to a mainly electrocapillary electrokinetic flow, which enhances the oxygen transport and assures the H2O2 flow to its reduction layer.

关键词： non homogeneous catalysis fuel cell cathode electrokinetic convection breathing area.

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Local and regional richness and rarity of leaf-litter ants:An overview from spacial scale in neotropical region

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Open Journal of Animal Sciences 2013年第2期3卷 10-15页

作者： Manoel Fernando demétrio Rogério Silvestre Programa de Pós Graduacao em Entomologia e Conservacao da Biodiversidade Universidade Federal da Grande DouradosDouradosMato Grosso do SulBrazil Laboratorio de Ecologia de Hymenoptera HECOLAB Faculdade de Ciencias Biologicas e Ambientais-UFGDCidade UniversitariaDouradosMato Grosso do SulBrazil

An unusual approach about richness and rarity of leaf-litter ant species is presented here from a dry forest reminiscent in Pantanal province (Chacoan subregion) suggesting the boundaries that defining local and regional scales for this particular ant community. We analysed the frequency of distribution of 170 ant species collected on 262 Winkler’s samples along Serra da Bodoquena National Park, Mato Grosso do Sul state, Brazil and described some ecological mechanisms that made the species richness estimates be highly influenced by species with low frequencies of records in an extent regional of a pristine dry forest. Bayesian inference was conducted to provide if the probability of latitudinal gradient was correlated with the species richness to define alpha diversity.

关键词： Alpha Diversity Formicidae Rarity Patterns Regional Scale

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Growth Curves for Diameter and Height Using Mixed Models: An Application in Eucalyptus Seedling

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Open Journal of Forestry 2017年第4期7卷 403-415页

作者： Giovana Fumes Clarice Garcia Borges demé trio Cristian Villegas José Eduardo Corrente Juliane Fumes Bazzo Department of Exact Sciences ESALQ University of S&#227 o Paulo Piracicaba Brazil Department of Biostatistics University of S&#227 o Paulo State Botucatu Brazil Department of Natural Resources-Forest Sciences University of S&#227 o Paulo State Botucatu Brazil

The growth of a tree or a forest settlement is of great value to a forest enterprise, because many decisions are directly dependent of this information, for instance, determining the optimal cutting age. This study aims to apply a new class of models to fit growth curves for diameter and height of Eucalyptus grandis X Eucalyptus urophylla seedling data. Data were collected from a trial conducted in a green house at the Natural Resources Department at School of Agriculture, Botucatu, S?o Paulo, Brazil. The experiment’s design was completely randomized with eight treatments and four replications. In this trial, the growth variables referring to the height and the diameter were evaluated, being measured five and four times, respectively. The methodology was carried in a mixed longitudinal model using a new approach based on Box-Cox Normal (BCN) distribution, and comparisons with this model were made assuming normality of the data. The results revealed that the BCN mixed model provided similar results to the standard model in order to estimate growth curves;however, the BCN model was the best result according to Akaike criterion, considering the slight asymmetry in the data set. This approach is of great interest in case of outliers and robust procedures for parameter estimation.

关键词： Box-Cox Normal Distribution Gompertz Model Longitudinal Data

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