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Search Results: 1 - 10 of 121040 matches for " Alexandre O.;Fagnani "
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Efeitos da cobertura do solo com filme de polietileno azul no consumo de água da cultura da alface cultivada em estufa
Gon?alves, Alexandre O.;Fagnani, Maria A.;Peres, José G.;
Engenharia Agrícola , 2005, DOI: 10.1590/S0100-69162005000300007
Abstract: the covering of the soil is an agricultural practice that intends to control the harmful herbs, to reduce the losses of water by evaporation of the soil, and to facilitate the harvest and the commercialization, once the product is cleaner and healthier. however, when the soil is covered important microclimatic parameters are also altered, and consequently the germination of seeds, the growth of roots, the absorption of water and nutrients, the metabolic activity of the plants and the carbohydrates storage. the current trial intended to evaluate the effect of soil covering with blue colored film on consumptive water-use in a lettuce crop (lactuca sativa, l.). the experiment was carried out in a plastic greenhouse in araras - s?o paulo state, brazil from march 3rd, 2001 to may 5th, 2001. the consumptive water-use was measured through two weighing lysimeter installed inside the greenhouse. crop spacing was 0.25 m x 0.25 m and the color of the film above soil was blue. leaf area index (iaf), was measured six times (7; 14; 21; 28; 35; 40 days after transplant) and the water-use efficiency (eu) was measured at the end. the experimental design was subdivided portions with two treatments, "bare soil" and "covered soil". the average consumptive water-use was 4.17 mm day-1 to the "bare soil" treatment and 3.11 mm day-1 to the "covered soil" treatment. the final leaf area index was 25.23 to the "bare soil" treatment and 24.39 to the "covered soil" treatment, and there was no statistical difference between then.
Cross neutralizing antibodies in hamsters vaccinated with leptospiral bacterins produced with three serovars of serogroup Sejroe
Tabata Rosana,Scanavini Neto Hugo,Zuanaze Marcelo Alexandre Fagnani,Oliveira Eugenia Márcia de Deus
Brazilian Journal of Microbiology , 2002,
Abstract: Three leptospiral bacterins, produced with different serovars of Serogroup Sejroe, namely the hardjo (bacterin A), wolffi (bacterin B) and guaricura (bacterin C), were evaluated in male hamsters (Mesocricetus auratus) by comparing the agglutinating and neutralizing antibodies titers using microscopic agglutination (MAT) and in vitro growth inhibition (GIT) tests. The immunization schedule was based on two 1.0 mL doses of non-diluted formalininactivated whole culture bacterin given through subcutaneous route with 10-day interval. The challenge was performed ten days after the second vaccine dose, when the animals were inoculated with 0.2 mL of non-inactivated cultures of each serovar through intraperitoneal route. On the 21st post-challenge day (PCD), all animals were bled and their sera were joined in pools (n=8) and tested by MAT and GIT. All vaccinated and control animals presented no clinical signs of leptospirosis after the challenge, but the serovar guaricura was isolated from the kidneys of control animals on the 21st PCD. The MAT results showed cross agglutinins between serovars hardjo and wolffi, and between wolffi and guaricura. The GIT results revealed the presence of cross neutralizing antibodies between serovars wolffi or guaricura against hardjo, wolffi and guaricura. It was found that the tested strain of serovar hardjo did not produce detectable levels of neutralizing antibodies, indicating its poor immunogenicity.
Microbiological quality ambience, foods and water, in restaurants of Ilha do Mel, Paraná State Qualidade microbiológica do ambiente, alimentos e água, em restaurantes da Ilha do Mel/PR
Ana Paula Pav?o Battaglini,Rafael Fagnani,Ronaldo Tamanini,Vanerli Beloti
Semina : Ciências Agrárias , 2012,
Abstract: Each year, several outbreaks of foodborne diseases are reported in Parana state, Brazil. Bacteria are responsible for 70% of these outbreaks and 95% of cases of food poisoning. There are reports that kitchen equipment and utensils contaminated have participated of approximately 16% of outbreaks. The aim of this study was to evaluate the microbiological quality of water, fresh foods, frozen foods, ready to eat food and sanitary conditions of three restaurants in Ilha do Mel – Paraná, Brazil, using PetrifilmTM. The results showed that 72.2% surfaces of had unsatisfactory sanitary conditions. Cutting boards, scrub sponge, kitchen sinks and dish towels had the highest average contamination. According to Brazilian law, samples of food outside of the standard were: seafood sauce, with 7,0 x 102 CFU/g of E. Coli, frozen mussels, with 7,0 x 102 CFU/g of E. coli; sample lettuce and grated carrot, considered clean, with 1,0 x 103 e 2,0 x 105 CFU/g of EC, respectively. All samples of food, in general, had high bacterial counts. Vegetables were the main responsible for the contamination of kitchen boards and sinks. The water used in the three restaurants had satisfactory microbiological quality. Better hygienic sanitary conditions were found in the restaurant where the employees had training in good manufacturing practices. Vários surtos de Doen as Transmitidas por Alimentos s o notificadas por ano no estado do Paraná, sendo as bactérias responsáveis por 70% destes surtos e 95% dos casos de toxinfec es alimentares. Existem relatos de que utensílios e equipamentos contaminados participam de, aproximadamente, 16% dos surtos. O objetivo deste trabalho foi avaliar a qualidade microbiológica da água, dos alimentos in natura, congelados e expostos ao consumo e as condi es higiênico-sanitárias de três restaurantes da Ilha do Mel/PR. Para produtos de origem animal, foi determinada a contagem de aeróbios mesófilos, coliformes totais, E. coli e S. aureus. Para equipamentos e utensílios inclui-se, ainda, a contagem de bolores e leveduras. Das superfícies analisadas, 72,2% apresentaram condi es higiênico-sanitárias insatisfatórias. Tábuas plásticas de corte, buchas de lou a, pias e os panos de prato e de pia apresentaram as maiores médias de contamina o. De acordo com a legisla o brasileira, os alimentos encontrados em desacordo com os padr es estabelecidos foram: o mexilh o congelado, com contagens de E. coli de 7,0 x 102 UFC/g; o molho de camar o, com 1,4 x 104 UFC/g; as amostras de alface e cenoura ralada, consideradas limpas, com 1,0 x 103 e 2,0 x 105 UFC/g de EC, res
Detailing the Structure of Liquid THF Based on an EPSR Study  [PDF]
Alexandre Borges, Jo?o M. M. Cordeiro
Computational Chemistry (CC) , 2015, DOI: 10.4236/cc.2015.31001
Abstract: The structure of pure liquid tetrahydrofuran (THF) has been investigated via Monte Carlo simulations in the wake of a previous Empirical Potential Structure Refinement (EPSR) study on that liquid (Bowron, D.T.; Finney, J.L.; Soper, A.K. (2006) J. Am. Chem. Soc., 128, 5119). The molecules are allatoms rigid structures and the intermolecular potential used is described for the classical 6-12 Lennard-Jones plus Coulomb in the NPT ensemble at 1 atm and 25°C. THF is a poorly structured liquid. Typical preferred orientation of molecules has been explored and calculations shown different types of molecular pairs exist concurrently in the liquid. The geometry of those pairs was deeply investigated and its influence in the liquid structure discussed. The lack of molecular organization in the liquid is closely related to the existence of that diversity of molecular pairs. Its geometry changes from antiparallel up to T-like depending on the distance between the molecules in the pairs.
Recent reforms in French and German family policies: Similar challenges, different responses
Fagnani,Jeanne; Math,Antoine;
Sociologia, Problemas e Práticas , 2010,
Abstract: this article investigates whether the recent reforms introduced in the family policies of both france and germany are leading the two countries towards some measure of convergence. germany has favoured dramatic changes, especially a new parental leave allowance, while france, for its part, has chosen a more gradual approach that has translated into an enhancement of its promotion of work-family reconciliation policies along with steady increases in spending related to childcare provision over the last decade. despite a rise in its overall supply of childcare germany still lags far behind france in this domain, a phenomenon that can be partially explained by a combination of institutional obstacles, the persistence of social norms governing childcare for under-3s, and excessive demand. we argue that the main drivers for paradigmatic change in germany have been concerns over the consequences of declining fertility; a shortfall of qualified workers; and, the shattering of certitudes following an oecd study on childhood education. in france reforms in parental leave policies have been more incremental with, for example, mothers being encouraged to retain their links to the workforce even while on leave. but while the reforms adopted by germany represent a radical departure from the former ‘male-breadwinner model’, mothers’ employment rates remain lower than in france and german mothers work part-time with much greater frequency than their french counterparts.
The asymptotical error of broadcast gossip averaging algorithms
Paolo Frasca,Fabio Fagnani
Mathematics , 2010,
Abstract: In problems of estimation and control which involve a network, efficient distributed computation of averages is a key issue. This paper presents theoretical and simulation results about the accumulation of errors during the computation of averages by means of iterative "broadcast gossip" algorithms. Using martingale theory, we prove that the expectation of the accumulated error can be bounded from above by a quantity which only depends on the mixing parameter of the algorithm and on few properties of the network: its size, its maximum degree and its spectral gap. Both analytical results and computer simulations show that in several network topologies of applicative interest the accumulated error goes to zero as the size of the network grows large.
From local averaging to emergent global behaviors: the fundamental role of network interconnections
Giacomo Como,Fabio Fagnani
Mathematics , 2015,
Abstract: Distributed averaging is one of the simplest and most studied network dynamics. Its applications range from cooperative inference in sensor networks, to robot formation, to opinion dynamics. A number of fundamental results and examples scattered through the literature are gathered here and originally presented, emphasizing the deep interplay between the network interconnection structure and the emergent global behavior.
Deconvolution of linear systems with quantized input: an information theoretic viewpoint
Fabio Fagnani,Sophie Fosson
Mathematics , 2010,
Abstract: In spite of the huge literature on deconvolution problems, very little is done for hybrid contexts where signals are quantized. In this paper we undertake an information theoretic approach to the deconvolution problem of a simple integrator with quantized binary input and sampled noisy output. We recast it into a decoding problem and we propose and analyze (theoretically and numerically) some low complexity on-line algorithms to achieve deconvolution.
Scaling limits for continuous opinion dynamics systems
Giacomo Como,Fabio Fagnani
Mathematics , 2010, DOI: 10.1214/10-AAP739
Abstract: Scaling limits are analyzed for stochastic continuous opinion dynamics systems, also known as gossip models. In such models, agents update their vector-valued opinion to a convex combination (possibly agent- and opinion-dependent) of their current value and that of another observed agent. It is shown that, in the limit of large agent population size, the empirical opinion density concentrates, at an exponential probability rate, around the solution of a probability-measure-valued ordinary differential equation describing the system's mean-field dynamics. Properties of the associated initial value problem are studied. The asymptotic behavior of the solution is analyzed for bounded-confidence opinion dynamics, and in the presence of an heterogeneous influential environment.
Broadcast gossip averaging algorithms: interference and asymptotical error in large networks
Paolo Frasca,Fabio Fagnani
Mathematics , 2010,
Abstract: In this paper we study two related iterative randomized algorithms for distributed computation of averages. The first one is the recently proposed Broadcast Gossip Algorithm, in which at each iteration one randomly selected node broadcasts its own state to its neighbors. The second algorithm is a novel de-synchronized version of the previous one, in which at each iteration every node is allowed to broadcast, with a given probability: hence this algorithm is affected by interference among messages. Both algorithms are proved to converge, and their performance is evaluated in terms of rate of convergence and asymptotical error: focusing on the behavior for large networks, we highlight the role of topology and design parameters on the performance. Namely, we show that on fully-connected graphs the rate is bounded away from one, whereas the asymptotical error is bounded away from zero. On the contrary, on a wide class of locally-connected graphs, the rate goes to one and the asymptotical error goes to zero, as the size of the network grows larger.
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