999 resultados para Bibliographic description
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1923 (VOL82).
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1862 (SER3,T8 = VOL28).
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1834 (T1).
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1875 (SER5,T3 = VOL41).
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1884 (SER5,T12 = VOL50).
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1867 (SER4,T3 = VOL33).
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1921 (VOL80).
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1913 (VOL77).
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1872 (SER4,T8 = VOL38).
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1877 (SER5,T5,N5 = VOL43).
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The known properties of diffusion on fractals are reviewed in order to give a general outlook of these dynamic processes. After that, we propose a description developed in the context of the intrinsic metric of fractals, which leads us to a differential equation able to describe diffusion in real fractals in the asymptotic regime. We show that our approach has a stronger physical justification than previous works on this field. The most important result we present is the introduction of a dependence on time and space for the conductivity in fractals, which is deduced by scaling arguments and supported by computer simulations. Finally, the diffusion equation is used to introduce the possibility of reaction-diffusion processes on fractals and analyze their properties. Specifically, an analytic expression for the speed of the corresponding travelling fronts, which can be of great interest for application purposes, is derived
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El treball que es presenta vol respondre la pregunta de quina és l’experiència dels cuidadors i les cuidadores principals informals que tenen cura d’un familiar vell amb demència des de fa més de 4 anys. Després de plantejar les hipòtesis de partida, es defineixen els objectius generals i específics i s’expliquen l’interès, la justificació, la rellevància i l’aportació d’aquest estudi. En l’apartat corresponent a l’estat de la qüestió i la fonamentació conceptual, després de fer una revisió bibliogràfica, es descriuen els elements que formen part d’aquesta temàtica: perfils dels receptors de cures i de les cuidadores, significat de tenir cura, vida quotidiana i qualitat de vida i descripció del model conceptual de Virginia Henderson. En el capítol següent s’exposen la metodologia, el paradigma i el mètode d’investigació utilitzats en aquest treball, així com les matrius d’anàlisi del contingut i del discurs. A partir d’aquí s’exposen els resultats en funció dels objectius plantejats. En la discussió, s’analitzen i s’interpreten les dades obtingudes i es contraposen amb altres estudis, a més de fer-se una reflexió personal sobre els aprenentatges adquirits i una proposta de línies de treball futures. A continuació s’exposen unes conclusions per resumir la informació obtinguda. En la secció de referències bibliogràfiques es detallen les fonts consultades, i en els annexos hi consten els models d’entrevista i de matriu per a l’anàlisi de dades, el full de consentiment informat, així com el buidatge i l’anàlisi de les entrevistes.
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The objective of this paper was to evaluate the potential of neural networks (NN) as an alternative method to the basic epidemiological approach to describe epidemics of coffee rust. The NN was developed from the intensities of coffee (Coffea arabica) rust along with the climatic variables collected in Lavras-MG between 13 February 1998 and 20 April 2001. The NN was built with climatic variables that were either selected in a stepwise regression analysis or by the Braincel® system, software for NN building. Fifty-nine networks and 26 regression models were tested. The best models were selected based on small values of the mean square deviation (MSD) and of the mean prediction error (MPE). For the regression models, the highest coefficients of determination (R²) were used. The best model developed with neural networks had an MSD of 4.36 and an MPE of 2.43%. This model used the variables of minimum temperature, production, relative humidity of the air, and irradiance 30 days before the evaluation of disease. The best regression model was developed from 29 selected climatic variables in the network. The summary statistics for this model were: MPE=6.58%, MSE=4.36, and R²=0.80. The elaborated neural networks from a time series also were evaluated to describe the epidemic. The incidence of coffee rust at four previous fortnights resulted in a model with MPE=4.72% and an MSD=3.95.
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Neste trabalho apresentamos os anfípodos do gênero Elasmopus, que são representados na coleção da Estação de Hidrobiologia do Instituto Oswaldo Cruz, e entre eles temos a honra de dedicar uma espécie ao Prof. W. Besnard. Assim este trabalho representa, de certo modo, uma contribuição aos resultados da Expedição do navio 'Baependi', realizada em 1950, à Ilha da Trindade.
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Increasing usage of Web Services has been result of efforts to automate Web Services discovery and interoperability. The Semantic Web Service descriptions create basis for automatic Web Service information management tasks such as discovery and interoperability. The discussion of opportunities enabled by service descriptions have arisen in recent years. The end user has been considered only as a consumer of services and information sharing occurred from one service provider to public in service distribution. The social networking has changed the nature of services. The end user cannot be seen anymore only as service consumer, because by enabling semantically rich environment and right tools, the end user will be in the future the producer of services. This study investigates the ways to provide for end users the empowerment to create service descriptions on mobile device. Special focus is given to the changed role of the end user in service creation. In addition, the Web Services technologies are presented as well as different Semantic Web Service description approaches are compared. The main focus in the study is to investigate tools and techniques to enable service description creation and semantic information management on mobile device.
