Uma abordagem teórica e experimental do oscilador harmônico em duas dimensões utilizando as curvas de Lissajous

The study of oscillatory phenomena is an important topic in several areas of knowledge. The understanding and the solution of many problems that scientists and engineers confront nowadays can be formulated, at least as an analogy, in terms of an oscillatory movement. The description of the motion of this nature has remarkable contributions to the mathematical and conceptual formation of the students and for solving daily problems in several areas. In this paper we propose a theoretical and experimental approach involving the phenomenon of harmonic oscillations in two dimensions. Lissajous curves were used as experimental demonstration of the resulting trajectories. These curves were obtained from relatively simple experimental apparatus, which is affordable in most teaching laboratories of physics.

Diagnostics of equatorial and low latitude ionosphere by TEC mapping over Brazil

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Kallen-Lehmann representation of noncommutative quantum electrodynamics

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Mass-Imbalanced Three-Body Systems in 2D: Bound States and the Analytical Approach to the Adiabatic Potential

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Sistema jagunço: localismo e universalismo em Grande sertão : veredas

Under different perspectives of interpretation and analysis, the notions of localism and universalism in the fictional production of Guimarães Rosa have been strongly explored by the criticism, especially in Grande sertão: veredas [The devil to pay in the backlands], in which these two dimensions – overlapped and complementary – become more intricate and profuse. Taking the analytical line of historical, social and political dimensions of the novel for granted – not regarding it as an essay or strict allegory of the country – the present study proposes a new reading of the composition with the interpretation of the articulation of these two dimensions in the forming of the “jagunço system” (ROSA, 1970, p.391), that is a concept created by Guimarães Rosa and which transcends the historical and sociological reality. The articulation of the social, political and cultural elements figure in Guimarães Rosa’s fiction and becomes an issue for wider debates and reflections, so that the particular element of the novel enables a universal survey. Based on diverse critical apprehensions of the novel, this paper aims to investigate the levels of the literary composition in which the local-universal articulation associated with the representation of the jagunço is constructed. In order to do that, the theoretical study is based on three dimensions of studies: a) critical essays about Guimarães Rosa, the totality of his work and specific critical essays about Grande sertão: veredas [The devil to pay in the backlands] and the “jagunço system”, b) theoretical apparatus concerning the history, the politics and the Brazilian culture related to the cangaço; and c) theoretical subsidies for the study of the narrative

Student's academic efficacy or Inefficacy? an example on how to evaluate the psychometric properties of a measuring instrument and evaluate the effects of item wording

This study evaluated the effect of item inversion on the construct validity and reliability of psychometric scales and proposed a theoretical framework for the evaluation of the psychometric properties of data gathered with psychometric instruments. To this propose, we used the Maslach Burnout Inventory, which is the most used psychometric inventory to measure burnout in different professional context (Students, Teachers, Police, Doctors, Nurses, etc…). The version of the MBI used was the MBI-Student Survey (MBI-SS). This inventory is composed of three key dimensions: Exhaustion, Cynicism and Professional Efficacy. The two first dimensions—which have positive formulated items—are moderate to strong positive correlated, and show moderate to strong negative correlations with the 3rd dimension—which has negative formulated items. We tested the hypothesis that, in college students, formulating the 3rd dimension of burnout as Inefficacy (reverting the negatively worded items in the Efficacy dimension) improves the correlation of the 3rd dimension with the other two dimensions, improves its internal consistency, and the overall MBI-SS’ construct validity and reliability. Confirmatory factor analysis results, estimated by Maximum Likelihood, revealed adequate factorial fit for both forms of the MBI-SS (with Efficacy) vs. the MBI-SSi (with Inefficacy). Also both forms showed adequate convergent and discriminant related validity. However, reliability and convergent validity were higher for the MBI-SSi. There were also stronger (positive) correlations between the 3 factors in MBI-SSi than the ones observed in MBI-SS. Results show that positively rewording of the 3rd dimension of the MBI-SS improves its validity and reliability. We therefore propose that the 3rd dimension of the MBI-SS should be named Professional Inefficacy and its items should be positively worded.

O terceiro ano do ciclo de alfabetização no Ensino Fundamental de nove anos: o que dizem alunos e professores

Pós-graduação em Educação Escolar - FCLAR

Magnetic-size effects in ultrathin layers

We study N-layer samples (N ≤ 10) for the Heisenberg model, with ferro- and antiferromagnetic exchange couplings, using a modified version of the Onsager reaction field approximation. The present scheme includes short-range spin-spin correlations, and allows for layer-dependent order parameters when free surface boundary conditions are imposed. The limits N = 1 (two dimensions) and N → ∞ (three dimensions) can be solved analytically, while systems with several layers have to be numerically calculated. We found no indication of a phase transition at finite temperature up to the sizes investigated (N = 10), the layered systems behaving essentially as two-dimensional. A phase transition is only obtained for the three-dimensional limit. © 1993.

Estágio supervisionado no curso de pedagogia a distância: aproximações e diferenças do ensino presencial

Pós-graduação em Educação - FCT

Tomografia computadorizada Cone Beam em Ortodontia - evolução ou revolução? visão geral, aplicações, vantagens/desvantagens e dose de radiação

Introduction: The request of three-dimensional images (3D) of the dentomaxillofacial complex has increased. Hence, new possibilities for assessment, treatment as well as follow-up after treatment have increased their importance with the use of cone beam computed tomography (CBCT). The images in two dimensions (2D) have inherent problems that can be solved with treedimensional images assessment. Objectives: To clarify the main doubts about the operational mechanism of complementary diagnostic method; to explain the advantages and disadvantages, to discuss the effective radiation dose and possible applications in orthodontia. Conclusion: The information generated by 2D images from the CBCT does not show differences that may endanger the orthodontic planning when compared with the images of 2D conventional radiographs. The effective radiation dose received by the patient should not be considered as a limiting factor of the tomography exam request.

O espaço-tempo não comutativo em Teoria Quântica de Campos, Matéria Condensada Mole e Física Biológica

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

O dispositivo analítico no hospital na clínica com transexuais: entre o ser e o sujeito

Pós-graduação em Psicologia - FCLAS

Estrutura de sistemas de três corpos fracamente ligados em duas dimensões

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Fluxo do grupo de renormalização dos modelos-'alfa' e as álgebras de Lie contínuas

Pós-graduação em Física - IFT

O problema de porte de estoque numa indústria moveleira

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)