Asymptotic Methods
Mostrando 1-12 de 43 artigos, teses e dissertações.
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1. Age and growth of two populations of Pugilina cochlidium (Gastropoda: Melongenidae), from Thondi coast-Palk Bay in Tamil Nadu-South East coast of India
Resumo A idade e o crescimento de duas populações de Pugilina cochlidium foram estudados. abordar a falta de informações básicas sobre as taxas de crescimento e o tamanho na maturidade sexual do organismo em uma área comercialmente colhida, o que será importante considerando os limites de tamanho para conservar esses recursos no futuro. No presente es
Braz. J. Biol.. Publicado em: 26/09/2019
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2. Biological survey of a cloud forest in southwestern Mexico: plants, amphibians, reptiles, birds, and mammals
Abstract: Cloud forest ecosystems contain unique flora and fauna characterized by high levels of richness and endemism. However, this ecosystem is one of the most threatened because of land-use changes stemming from anthropogenic activities. Therefore, biological inventories are necessary to adequately assess the effects of land-use changes on species now an
Biota Neotrop.. Publicado em: 12/04/2018
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3. Stress State at the Vertex of a Composite Wedge, One Side of Which Slides Without Friction Along a Rigid Surface
Abstract For studying the stress-strain state at singular points and their neighborhoods new concept is proposed. A singular point is identified with an elementary volume that has a characteristic size of the real body representative volume. This makes it possible to set and study the restrictions at that point. It is shown that problems with singular points
Lat. Am. j. solids struct.. Publicado em: 2017
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4. Application of Iteration Perturbation Method in studying dynamic pull-in instability of micro-beams
In the present study, dynamic pull-in instability of electrostatically-actuated micro-beams is investigated through proposing the nonlinear frequency amplitude relationship. An approximate analytical expression of the fundamental natural frequency is presented by modern asymptotic approach namely Iteration Perturbation Method (IPM). Influences of vibrational
Lat. Am. j. solids struct.. Publicado em: 2014-12
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5. Critical points in logistic growth curves and treatment comparisons
Several biological phenomena have a behavior over time mathematically characterized by a strong increasing function in the early stages of development, then by a less pronounced growth, sometimes showing stability. The separation between these phases is very important to the researcher, since the maintenance of a less productive phase results in uneconomical
Sci. agric. (Piracicaba, Braz.). Publicado em: 2012-10
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6. Bootstrap confidence intervals for industrial recurrent event data
Industrial recurrent event data where an event of interest can be observed more than once in a single sample unit are presented in several areas, such as engineering, manufacturing and industrial reliability. Such type of data provide information about the number of events, time to their occurrence and also their costs. Nelson (1995) presents a methodology t
Pesquisa Operacional. Publicado em: 03/04/2012
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7. Recent developments of some asymptotic methods and their applications for nonlinear vibration equations in engineering problems: a review
This review features a survey of some recent developments in asymptotic techniques and new developments, which are valid not only for weakly nonlinear equations, but also for strongly ones. Further, the achieved approximate analytical solutions are valid for the whole solution domain. The limitations of traditional perturbation methods are illustrated, vario
Lat. Am. j. solids struct.. Publicado em: 2012-04
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8. O uso de quase U-estatísticas para séries temporais uni e multivaridas / The use of quasi U-statistics for univariate and multivariate time series
Classifcation and clustering of time series are problems widely explored in the current literature. Many techniques are presented to solve these problems. However, the necessary restrictions in general, make the procedures specific and applicable only to a certain class of time series. Moreover, many of these approaches are empirical. We present methods for
Publicado em: 2011
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9. Estabilização assintótica e controle no problema de conexões em série de vigas / Asymptotic stabilization and control in the problem of serially connected beams
In this work, we study the modell of a system of N beams interconnected with each other, where one of its ends is clamped and the other is submitted to a dissipative mechanism of frictional type. We show that model is well posed, using the semigroup theory, and using energy method, we prove that the system is exponentially stable. Finally, through numerical
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/09/2010
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10. Combinação de modelos de campos aleatórios markovianos para classificação contextual de imagens multiespectrais / Combining markov random field models for multispectral image contextual classification
This work presents a novel MAP-MRF approach for multispectral image contextual classification by combining higher-order Markov Random Field models. The statistical modeling follows the Bayesian paradigm, with the definition of a multispectral Gaussian Markov Random Field model for the observations and a Potts MRF model to represent the a priori knowledge. In
Publicado em: 2010
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11. Lack of association between the serotonin transporter promoter polymorphism (5-HTTLPR) and panic disorder : a systematic review and meta-analysis
Background: The aim of this study is to assess the association between the Serotonin Transporter Promoter Polymorphism (5-HTTLPR) and Panic Disorder (PD). Methods: This is a systematic review and meta-analysis of case-control studies with unrelated individuals of any ethnic origin examining the role of the 5-HTTLPR in PD according to standard diagnostic crit
Publicado em: 2010
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12. Instantonic methods for quantum tunneling in finite size
The instantonic approach for a Φ4 model potential is reexamined in the asymptotic limit. The path integral of the system is derived in semiclassical approximation expanding the action around the classical background. It is shown that the singularity in the path integral, arising from the zero mode in the quantum fluctuation spectrum, can be tackled only ass
Brazilian Journal of Physics. Publicado em: 2009-12