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Search Results: 1 - 10 of 1488 matches for " Flavio Aristone "
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A Study of Human Thermal Comfort, Ozone and Respiratory Diseases in Children  [PDF]
Amaury de Souza, Flavio Aristone, Luciane Fernandes
Atmospheric and Climate Sciences (ACS) , 2014, DOI: 10.4236/acs.2014.44060
Abstract: Objective: To assess the impact of air pollution and ozone on morbidity due to respiratory diseases among children from 2005 to 2008. Methods: The database was composed by daily reports on visits by children with respiratory diseases in health units of the Unified Health System (SUS) in the municipality of Campo Grande, MS, Brazil, by daily levels of ozone concentration measured by the Department of Physics, Federal University of Mato Grosso do Sul, and by daily measurements of temperature and relative humidity provided by the Agricultural Research Corporation-EMBRAPA Gado de Corte-MS. The relationship between respiratory diseases and ozone concentration was investigated through Generalized Linear Models (GLM) using the multiple Poisson regression model. The significance level α = 5% was adopted for all tests. Results: It was observed that the association between ozone (lagged by three time-steps) and attendance for respiratory diseases in children was statistically significant. The bio-meteorological variable Wind-adjusted Effective Temperature (lagged by four time-steps) was also significantly associated with diseases. Conclusions: The results suggest that the surface ozone concentration promotes adverse effects on children’s health even when pollutant levels are below the amounts permitted by law.
Modeling the Surface Ozone Concentration in Campo Grande (MS)—Brazil Using Neural Networks  [PDF]
Amaury de Souza, Flavio Aristone, Ismail Sabbah
Natural Science (NS) , 2015, DOI: 10.4236/ns.2015.74020
Abstract: The estimation of the surface ozone concentration promotes the creation of data useful for planning the air quality forecast, which is a key element for the management of public health. The aim of this study is to develop an Artificial Neural Network (ANN) to estimate the concentration of surface ozone from daily climate data. ANN is an equivalent form of Feedforward Multilayer Perceptron whose data has been inserted from the daily concentration of measured ozone. In the intermediate and output layers activation functions like tan-sigmoid and linear have been used, respectively. The performance of the developed ANN is actually very good and it can be considered like part of the set of indirect methods to estimate the concentration of surface ozone. The proposed model may be used by governmental agencies as a tool to enable the public interventional actions during the period of atmospheric stagnation, when ozone levels in the atmosphere represent risks to the public health.
Climatic Variations and Consumption of Urban Water  [PDF]
Amaury de Souza, Flavio Aristone, Ismail Sabbah, Debora A. da Silva Santos, Ana Paola de Souza Lima, Gabriela Lima
Atmospheric and Climate Sciences (ACS) , 2015, DOI: 10.4236/acs.2015.53022
Abstract: This study aims to develop a statistical modelling framework of urban water consumption forecast for the city of Aquidauana, Brazil from year 2005 to 2014, monthly data, using multiple linear regression, cluster analysis, and principal component analysis. These forecasts were based on historical data collected through SANESUL System (Water Systems of South Mato Grosso). The meteorological data were provided by the Water Resources Monitoring Center of South Mato Grosso—CEMTEC. The statistical model developed explains 71.5% of the variance with three factors: number of consumers (19.3%), seasonality (37.8%), and climate regression (14.3%). The model was further validated using an independent set of data from January 2005 to November 2014, with an R2 of 86% and error of 1.7%. The results indicated no intervention of climate variables in the phenomenon. This tool, combined with the perception of the potential and limitations of managers of water resources and public policy makers, can be used in the regulation of per capita consumption, and thereby achieve the optimization of available resources and also contribute to the sustainable perspective of water resources.
Two-subband electron transport in nonideal quantum wells
O. G. Balev,F. T. Vasko,Flavio Aristone,Nelson Studart
Physics , 2000, DOI: 10.1103/PhysRevB.62.10212
Abstract: Electron transport in nonideal quantum wells (QW) with large-scale variations of energy levels is studied when two subbands are occupied. Although the mean fluctuations of these two levels are screened by the in-plane redistribution of electrons, the energies of both levels remain nonuniform over the plane. The effect of random inhomogeneities on the classical transport is studied within the framework of a local response approach for weak disorder. Both short-range and small-angle scattering mechanisms are considered. Magnetotransport characteristics and the modulation of the effective conductivity by transverse voltage are evaluated for different kinds of confinement potentials (hard wall QW, parabolic QW, and stepped QW).
Effect of DX centers in the vertical transport properties of semiconductor superlattices
Aristone, F.;Goutiers, B.;Gauffier, J. L.;Dmowski, L.;
Brazilian Journal of Physics , 2000, DOI: 10.1590/S0103-97332000000100018
Abstract: dx centers have been detected in vertical transport experiments of gaas-alas superlattices. we studied miniband conduction properties of such semiconductor structures in presence of high hydrostatic pressures and controlled temperature. hystheresis effect in the current-voltage characteristics was observed. we show that miniband transport properties are dependent on the path of the pressure cycle imposed to the sample. it is clear from our results that dx centers are present in the active superlattice region. we propose that the energy associated with dx states in superlattice results from a "hybridization" of dx centers of both gaas and alas bulk materials.
Effect of DX centers in the vertical transport properties of semiconductor superlattices
Aristone F.,Goutiers B.,Gauffier J. L.,Dmowski L.
Brazilian Journal of Physics , 2000,
Abstract: DX centers have been detected in vertical transport experiments of GaAs-AlAs superlattices. We studied miniband conduction properties of such semiconductor structures in presence of high hydrostatic pressures and controlled temperature. Hystheresis effect in the current-voltage characteristics was observed. We show that miniband transport properties are dependent on the path of the pressure cycle imposed to the sample. It is clear from our results that DX centers are present in the active superlattice region. We propose that the energy associated with DX states in superlattice results from a "hybridization" of DX centers of both GaAs and AlAs bulk materials.
First International Conference between West and East—Leonardo and Lao-Tze. Western Science Meets Eastern Wisdom. Experiences of Scientists and Intellectuals for the Creation of a New Paradigm of Modern Science
Flavio Daniele
Evidence-Based Complementary and Alternative Medicine , 2008, DOI: 10.1093/ecam/nem039
Abstract: The Conference was organized and supported by: Nei Dan School (European School of Internal Martial Arts), NIB (Laboratory of Molecular Biology and Stem Cell Bioengineering, National Institute of Biostructures and Biosystems, Institute of Cardiology, S.Orsola-Malpighi Hospital, Bologna), WACIMA (Worldwide Association Chinese Internal Martial Arts), Arti D’Oriente (Magazine of Eastern culture and traditions), Nuovo Orizzonte (Taiji Quan School in Florence), Samurai (Journal on Martial Arts), and Pinus (First National Institute for the Unification of Medical Strategies). Nei Dan School (www.taichineidan.com, neidan@libero.it) was in charge of the organization. Future meetings of the Centro studi ‘Tao and Science’ will take place in spring 2007 in Firenze and in October 2007 in Bologna. For information: E-mail: neidan@libero.it; web site: www.taichineidan.com, www.taoandscience.com.
Poverty determinants of acute respiratory infections among Mapuche indigenous peoples in Chile's Ninth Region of Araucania, using GIS and spatial statistics to identify health disparities
Flavio Rojas
International Journal of Health Geographics , 2007, DOI: 10.1186/1476-072x-6-26
Abstract: Hospital discharge records from Health Services North N = 24,126 patients, year 2003, and 7 hospitals), Health Services South (N = 81,780 patients and 25 hospitals); CAS-2/Family records (N = 527,539 individuals, 439 neighborhoods, 32 Comunas).Given the over-dispersion of data and the clustered nature of observations, we used the global Moran's I and General G Gettis-Ord procedures to test spatial dependence. These tests confirmed the clusters of disease and the need to use spatial regression within a General Linear Mixed Model perspective.Health outcomes indicate significantly higher morbidity rates for the Mapuche compared to non-Mapuche in both age groups < 5 and 15–44, respectively; for the groups 70–79 and 80 + years of age, this trend is reversed. Mortality rates, however, are higher among Mapuches than non-Mapuches for the entire Ninth Region and for all age groups. Mortality caused by respiratory infections is higher among Mapuches than non-Mapuches in all age-groups. A major finding is the link between poverty and respiratory infections.Poverty is significantly associated with respiratory infections in the population of Chile's Ninth Region. High deprivation areas are associated with poverty, and poverty is a predictor of respiratory infections. Mapuches are at higher risk of deaths caused by respiratory infections in all age groups. Exponential and spherical spatial correlation models were tested to estimate the previous association and were compared with non-spatial Poisson, concluding that significant spatial variability was present in the data.This article addresses some aspects of the relationship between poverty and disease. The study area is located in Chile's Ninth Region, also known as Araucanía, the poorest of the country's 13 regions, and one where income distribution reveals inequality that is not only the worst in the country, but the worst in the world, with a Gini coefficient of 0.58 [1,2]. The main goal of this article is to show the link be
A voz dos cientistas críticos
Lewgoy, Flavio;
História, Ciências, Saúde-Manguinhos , 2000, DOI: 10.1590/S0104-59702000000300019
Abstract: the intricate debate over genetically modified organisms (gmos) involves powerful economic interests, as well as ethical, legal, emotional and scientific aspects, some of which are dealt with in this paper. (it is possible to identify two main groups of scientists across the gmos divide: the triumphalist and the critical group.) scientists in the triumphalist group state that gmos and their derivatives are safe for the environment and do not offer health hazards any more than similar, non-genetically modified, products. this view is disputed by the critical scientists, who are prompted by the scarcity of studies on the environmental impacts and toxicity of gmos, and who point out flaws in tests performed by the same companies which hold the patents. they are also critical of the current state of the process of gene transference, lacking accuracy, a fact which, coupled with the scant knowledge available about 97% of the genome functions, may produce unforeseeable effects with risks for the environment and public health yet to be assessed. examples of such effects are: the transference of alien genes [??] to other species, the emergence of toxins, the creation of new viruses, the impacts on beneficial insects and on biodiversity in general.
Fontes alternativas para uma história das ciências
Edler, Flavio;
História, Ciências, Saúde-Manguinhos , 1995, DOI: 10.1590/S0104-59701995000100008
Abstract: in this study we call attention to the importance of 'manguinhos' scientific collections, which preserve a major portion of the memory of scientific practice as developed by brazilian researchers in the field of biomedical sciences. we make use of these collections to approach some little-known aspects of scientific activity: the historical evaluation of forms of zoological classification and efforts at legitimating scientific practice.
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