Approximate Methods
Mostrando 13-24 de 158 artigos, teses e dissertações.
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13. Fifty years of Brazilian Dental Materials Group: scientific contributions of dental materials field evaluated by systematic review
ABSTRACT Objective A systematic review was conducted to analyze Brazilian scientific and technological production related to the dental materials field over the past 50 years. Material and Methods This study followed the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (Prisma) statement. Searches were performed until December 2014 in s
J. Appl. Oral Sci.. Publicado em: 2016-06
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14. Cytolytic and systemic toxic effects induced by the aqueous extract of the fire coral Millepora alcicornis collected in the Mexican Caribbean and detection of two types of cytolisins
AbstractBackground Millepora alcicornis is a branching hydrocoral common throughout the Caribbean Sea. Like other members of this genus, this species is capable of inducing skin eruptions and blisters with severe pain after contact. In the present study, we investigated the toxicity of theM. alcicornis aqueous extract on several animal models. Considering th
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 20/10/2015
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15. 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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16. A Mixed-Integer convex formulation for production optimization of gas-lifted oil fields with routing and pressure constraints
Production optimization of gas-lifted oil fields under facility, routing, and pressure constraints has attracted the attention of researchers and practitioners for its scientific challenges and economic impact. The available methods fall into one of two categories: nonlinear or piecewise-linear approaches. The nonlinear methods optimize simulation models dir
Braz. J. Chem. Eng.. Publicado em: 2014-06
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17. Explicit solution of the large amplitude transverse vibrations of a flexible string under constant tension
This paper presents the analytical simulation of string with large amplitudes using the Variational Iteration Method (VIM) and Hamiltonian Approach (HA). In order to verify the precision of the presented methods, current results were compared with He's Variational Approach and Runge-Kutta 4th order. It has been found that these methods are well suited for a
Lat. Am. j. solids struct.. Publicado em: 2014-05
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18. Dynamic model of large amplitude vibration of a uniform cantilever beam carrying an intermediate lumped mass and rotary inertia
In this paper, a mathematical model of large amplitude vibration of a uniform cantilever beam arising in the structural engineering is proposed. Two efficient and easy mathematical techniques called variational iteration method and He's variational approach are used to solve the governing differential equation of motion. To assess the accuracy of solutions,
Lat. Am. j. solids struct.. Publicado em: 2014-03
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19. Study of nonlinear vibration of Euler-Bernoulli beams by using analytical approximate techniques
In this paper, nonlinear responses of a clamped-clamped buckled beam are investigated. Two efficient and easy mathematical techniques called He's Variational Approach and Laplace Iteration Method are used to solve the governing differential equation of motion. To assess the accuracy of solutions, we compare the results with the Runge-Kutta 4th order. The res
Lat. Am. j. solids struct.. Publicado em: 2014-01
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20. Evolving granular systems = : Sistemas granulares evolutivos / Sistemas granulares evolutivos
In recent years there has been increasing interest in computational modeling approaches to deal with real-world data streams. Methods and algorithms have been proposed to uncover meaningful knowledge from very large (often unbounded) data sets in principle with no apparent value. This thesis introduces a framework for evolving granular modeling of uncertain
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/07/2012
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21. Estudos das características técnicas e operacionais das galerias de águas pluviais como subsídios para gestão patrimonial e estabelecimento de diretrizes para projetos de sistemas de drenagem urbana
The purpose of this work is to study the emergence and evolution of pathological manifestations in urban stormwater channels and relate them to technical and operational characteristics of concrete structures so that plans for urban drainage systems management are developed, as well as new concepts for stormwater channel projects. The main reference is the D
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/04/2012
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22. Pigment effect on the long term elasticity of elastomeric ligatures
OBJECTIVE: To evaluate the response of elastomeric ligatures in several colors for a 4 mm traction over time. METHODS: Morelli® elastomeric ligatures, were submitted to traction forces using two rods of circular cross section, until a 4 mm distance was reached, matching the approximate diameter of an upper central incisor bracket of the same manufacturer. T
Dental Press Journal of Orthodontics. Publicado em: 2012-06
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23. Linear and nonlinear analysis of heart rate variability in healthy subjects and after acute myocardial infarction in patients
The objectives of this study were to evaluate and compare the use of linear and nonlinear methods for analysis of heart rate variability (HRV) in healthy subjects and in patients after acute myocardial infarction (AMI). Heart rate (HR) was recorded for 15 min in the supine position in 10 patients with AMI taking β-blockers (aged 57 ± 9 years) and in 11 hea
Brazilian Journal of Medical and Biological Research. Publicado em: 2012-05
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24. 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