Invariant
Mostrando 13-24 de 1069 artigos, teses e dissertações.
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13. Evasão ou mobilidade: conceito e realidade em uma licenciatura
Resumo: Considerando a saída significativa de alunos no primeiro ano do curso de Licenciatura em Ciências da Universidade Federal de São Paulo e o cenário sócio-político da expansão do ensino superior no país, problematizamos o emprego do conceito de evasão para referir-se a essa saída prematura. Por meio de uma pesquisa-ação com a participação
Ciênc. educ. (Bauru). Publicado em: 25/04/2019
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14. Scale of Positive and Negative Affects (EAPN-10): Evidence of its Psychometric Adequacy
Resumo Este estudo objetivou reunir evidências psicométricas da Escala de Afetos Positivos e Negativos (EAPN-10) no contexto brasileiro. Realizaram-se três estudos. O Estudo 1 considerou 296 estudantes universitários (MIdade = 23,8; 59,1% mulheres), os quais responderam a EAPN-10 e perguntas demográficas. A análise fatorial exploratória revelou uma es
Trends Psychol.. Publicado em: 2019-01
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15. QUÉ PUEDE DECIRNOS LA RELATIVIDAD GENERAL RESPECTO DE LA FLECHA DEL TIEMPO
Abstract Traditionally, from the viewpoint of the philosophy of physics, the problem of the arrow of time has been addressed considering the formal properties exhibited by the fundamental physical laws. In particular, if the laws remain invariant under time reversal, then a privileged temporal direction cannot be distinguished on physical grounds. On the con
Manuscrito. Publicado em: 08/10/2018
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16. Two helpful developments towards better understanding of adiabatic invariance in classical mechanics
Abstract The topic of difficult understanding of adiabatic invariance in classical mechanics is dealt with in a more understandable way. Using the one-dimensional harmonic oscillator as an example, the goals of this paper are twofold. First, given a first-order parameter variation, the second-order magnitude of the correction to the adiabatic invariant is es
Rev. Bras. Ensino Fís.. Publicado em: 21/09/2018
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17. The meanings of mass and E = mc2: an approach based on conceptual maps
Abstract In this work, we discuss transformations in the meaning of the concept of mass, which are important to physics teaching, by means of three conceptual schemes, which emphasize visual patterns of knowledge organization. We begin by discussing how the meaning of a physical concept is constructed, through its relations with others. In physical theories,
Rev. Bras. Ensino Fís.. Publicado em: 24/05/2018
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18. Non-decimated Wavelet Transform for a Shift-invariant Analysis
RESUMO Devido sua habilidade de localização tempo-frequência, a Transformada wavelet tem sido aplicada em várias áreas de pesquisa envolvendo análise e processamento de dados, frequentemente substituindo a convencional Transformada de Fourier. A TransformadaWavelet Discreta tem um grande potencial de aplicação¸ destacando-se como uma importante ferr
TEMA (São Carlos). Publicado em: 2018-01
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19. Quantum Particle Swarm Optimization for Synthesis of Non-uniformly Spaced Linear Arrays with Broadband Frequency Invariant Pattern
Abstract This paper describes a method using Quantum Particle Swarm Optimization to obtain a broadband frequency invariant pattern for synthesis of nonuniformly spaced linear array of isotropic antennas. Two cases related to this work using QPSO have been studied, namely, in the first case, the generated frequency invariant far-field pattern is broadside in
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
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20. Evolution of TiO2 Nanotubular Morphology Obtained in Ethylene Glycol/Glycerol Mixture and its Photoelectrochemical Performance
The evolution of TiO2 nanotubular morphology, synthesized in a mixture of fluorinated ethylene glycol and glycerol electrolyte, was studied as a function of the anodization time. The samples were characterized by FEG-SEM, XRD, XPS, UV-Vis and EIS. The formation of single-or double-walled TiO2 nanotube structure can be efficiently controlled by the anodizatio
Mat. Res.. Publicado em: 18/05/2017
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21. Nonlinear Vibration and Mode Shapes of FG Cylindrical Shells
Abstract The nonlinear vibration and normal mode shapes of FG cylindrical shells are investigated using an efficient analytical method. The equations of motion of the shell are based on the Donnell’s non-linear shallow-shell, and the material is assumed to be gradually changed across the thickness according to the simple power law. The solution is provided
Lat. Am. j. solids struct.. Publicado em: 2017-03
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22. An Efficient Human Identification through MultiModal Biometric System
ABSTRACT Human identification is essential for proper functioning of society. Human identification through multimodal biometrics is becoming an emerging trend, and one of the reasons is to improve recognition accuracy. Unimodal biometric systems are affected by various problemssuch as noisy sensor data,non-universality, lack of individuality, lack of invaria
Braz. arch. biol. technol.. Publicado em: 23/01/2017
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23. Microstructural Characterization of As-Cast V-Si Alloys and Reevaluation of the Invariant Reactions Involving the Liquid Phase of the V-Si System
Alloys containing Me-Si-B (Me - Refractory Metal) are of great interest for high temperature structural applications and accurate knowledge of its low order systems (binaries and ternaries) is important to predict the phase relations in the multicomponent alloys. Recent reevaluations of binaries containing Me-Si found out that the accuracy of the description
Mat. Res.. Publicado em: 05/09/2016
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24. Máquinas Nomológicas, Modelos e Intervención: su Problemática en el Campo de lo Social
ABSTRACT: In the present paper, a critique of Nancy Cartwright's nomological machines approach in the social sciences will be made. It is argued that social phenomena do not correspond to the logic of "capacities", but to the logic of "possibility trees" or "open-ended results". Stability or invariance, although possible in the social realm, seem to be more
Trans/Form/Ação. Publicado em: 2016-06