Citogenética comparativa de peixes da família Cichlidae

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Atividade de ensino de ciências: representação de alunos do ensino fundamental - NPI/UFPA

O presente estudo objetivou analisar as representações sociais das atividades de ensino de ciências de alunos da oitava série, de ambos os sexos, do ensino fundamental do Núcleo Pedagógico Integrado/NPI-Escola de Aplicação de Educação Básica da Universidade Federal do Pará, do ano de 2003/4. Além de investigar os conteúdos partilhados pelos alunos e identificar as contribuições das representações sociais para as atividades de ensino de ciências na prática do ensino de educação em ciências. O princípio que orientou essa investigação foi a Teoria das Representações Sociais elaborada por Serge Moscovic em 1961. A Teoria das Representações Sociais é definida por seu criador como o conjunto de conceitos, proposições e explicações originado na vida cotidiana no curso de comunicações interpessoais. Elas são equivalentes, em nossa sociedade, aos mitos e sistemas de crenças das sociedades tradicionais; podem também ser vistas como a versão contemporânea do senso comum. Esse estudo se fundamentou especialmente na Teoria do Núcleo Central proposta por Abric(1994) e colaboradores, que vem sendo desenvolvida ao longo dos anos: Todos os elementos da representação são hierarquizados e situam-se em torno de um núcleo central, constituído de um ou de alguns elementos que dão à representação o seu significado. O desenvolvimento do trabalho incluiu a caracterização dos sujeitos pertencentes a quatro turmas do período letivo de 2004 num total de 119 sujeitos respondentes. Foi realizada anteriormente, a aplicação de um questionário-piloto que procurou testar e validar as questões nele elaboradas. Tinha como principal objetivo identificar as representações sociais desses alunos a partir da questão: Quais são as representações sociais das atividades de ensino de ciências que os alunos de oitava série possuem? Utilizando a Teoria do Núcleo Central, foi possível perceber as imagens e sentidos na relação das atividades de ensino de ciências e as representações dos alunos, principalmente com a expressão meio ambiente como sua maior manifestação. Além disso, foi percebida a relação dos elementos do universo através de seus componentes, tendo o ser humano como seu elemento integrador. As representações (imagens e sentidos) percebidas sugerem um conjunto de reações positivas e negativas com vistas à transformação do ensino praticado em sala de aula. Os sujeitos propõem um refazer da prática dos membros da comunidade escolar, especialmente à prática dos professores. Esperamos que os resultados deste estudo sejam relevantes para o aprimoramento dos objetivos da educação científica, pois trazem reflexões importantes para o decisivo processo de melhoria da prática docente.

Traumatismo alvéolo-dentário: prevalência em crianças e conhecimento de educadores do ensino fundamental

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Influence of Platform and Abutment Angulation on Peri-Implant Bone. A Three-Dimensional Finite Element Stress Analysis

The aim of this study was to evaluate stress distribution on the pen-implant bone, simulating the influence of Nobel Select implants with straight or angulated abutments on regular and switching platform in the anterior maxilla, by means of 3-dimensional finite element analysis. Four mathematical models of a central incisor supported by external hexagon implant (13 mm x 5 mm) were created varying the platform (R, regular or S. switching) and the abutments (S, straight or A, angulated 15 degrees). The models were created by using Mimics 13 and Solid Works 2010 software programs. The numerical analysis was performed using ANSYS Workbench 10.0. Oblique forces (100 N) were applied to the palatine surface of the central incisor. The bone/implant interface was considered perfectly integrated. Maximum (sigma(max)) and minimum (sigma(min)) principal stress values were obtained. For the cortical bone the highest stress values (sigma(max)) were observed in the RA (regular platform and angulated abutment, 51 MPa), followed by SA (platform switching and angulated abutment, 44.8 MPa), RS (regular platform and straight abutment, 38.6 MPa) and SS (platform switching and straight abutment, 36.5 MPa). For the trabecular bone, the highest stress values (sigma(max)) were observed in the RA (6.55 MPa), followed by RS (5.88 MPa), SA (5.60 MPa), and SS (4.82 MPa). The regular platform generated higher stress in the cervical periimplant region on the cortical and trabecular bone than the platform switching, irrespective of the abutment used (straight or angulated).

Measurement of the t-channel single-top-quark production cross section and of the |V (tb)| CKM matrix element in pp collisions at root s=8 TeV

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Genomic regions harboring insecticide resistance-associated Cyp genes are enriched by transposable element fragments carrying putative transcription factor binding sites in two sibling Drosophila species

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Stress distribution on dentin-cement-post interface varying root canal and glass fiber post diameters. A three-dimensional finite element analysis based on micro-C data

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

Influence of Tapered and External Hexagon Connections on Bone Stresses Around Tilted Dental Implants: Three-Dimensional Finite Element Method With Statistical Analysis

Background: The purpose of this study is to analyze the tension distribution on bone tissue around implants with different angulations (0 degrees, 17 degrees, and 30 degrees) and connections (external hexagon and tapered) through the use of three-dimensional finite element and statistical analyses.Methods: Twelve different configurations of three-dimensional finite element models, including three inclinations of the implants (0 degrees, 17 degrees, and 30 degrees), two connections (an external hexagon and a tapered), and two load applications (axial and oblique), were simulated. The maximum principal stress values for cortical bone were measured at the mesial, distal, buccal, and lingual regions around the implant for each analyzed situation, totaling 48 groups. Loads of 200 and 100 N were applied at the occlusal surface in the axial and oblique directions, respectively. Maximum principal stress values were measured at the bone crest and statistically analyzed using analysis of variance. Stress patterns in the bone tissue around the implant were analyzed qualitatively.Results: The results demonstrated that under the oblique loading process, the external hexagon connection showed significantly higher stress concentrations in the bone tissue (P < 0.05) compared with the tapered connection. Moreover, the buccal and mesial regions of the cortical bone concentrated significantly higher stress (P < 0.005) to the external hexagon implant type. Under the oblique loading direction, the increased external hexagon implant angulation induced a significantly higher stress concentration (P = 0.045).Conclusions: The study results show that: 1) the oblique load was more damaging to bone tissue, mainly when associated with external hexagon implants; and 2) there was a higher stress concentration on the buccal region in comparison to all other regions under oblique load.

Non-linear 3D finite element analysis of full-arch implant-supported fixed dentures

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

Heterochromatin and molecular characterization of DsmarMITE transposable element in the beetle Dichotomius schiffleri (Coleoptera: Scarabaeidae)

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

Potential of bamboo organosolv pulp as a reinforcing element in fiber-cement materials

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Finite element evaluation of three methods of stable fixation of condyle base fractures

The surgical treatment of mandibular condyle fractures currently offers several possibilities for stable internal fixation. In this study, a finite element model evaluation was performed of three different methods for osteosynthesis of low subcondylar fractures: (1) two four-hole straight plates, (2) one seven-hole lambda plate, and (3) one four-hole trapezoidal plate. The finite element model evaluation considered a load applied to the first molar on the contralateral side to the fracture. Results showed that, although the three methods are capable of withstanding functional loading, the lambda plate displayed a more homogeneous stress distribution for both osteosynthesis material and bone and may be a better method when single-plate fixation is the option.

INFLUENCE OF THE VENEER-FRAMEWORK INTERFACE ON THE MECHANICAL BEHAVIOR OF CERAMIC VENEERS: A NONLINEAR FINITE ELEMENT ANALYSIS

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

Lumped element modeling of operational structures by inverting the mobility models

This paper is concerned with what a source precisely sees when it drives a receiver such as a continuous structural object. An equivalent lumped element system consisting of masses, springs and dampers is developed to visually represent the operational structural dynamics of a single-input structure at the driving point. The development is solely based on the mobility model of the driving point response. The mobility model is mathematically inverted to give the impedance model that is suitable for lumped element modeling. The two types of structures studied are unconstrained inertial objects and constrained resilient objects. The lumped element systems presented suggest a new view to dynamics that a single-input flexible structure in operation can be decomposed into the two subsystems: a base system of single degree of freedom (or of a mass for an inertial object) whose mass is in contact with the source and an appendage system consisting of a series of oscillators each of which is attached to the base mass. The driving point response is a result of the coupling between the two subsystems. (C) 2014 Elsevier Ltd. All rights reserved.

Specific Activation of an I-Like Element in Drosophila Interspecific Hybrids

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