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Institution

Universidade de Pernambuco

EducationRecife, Brazil
About: Universidade de Pernambuco is a education organization based out in Recife, Brazil. It is known for research contribution in the topics: Population & Artificial neural network. The organization has 6147 authors who have published 6948 publications receiving 73648 citations.


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Journal ArticleDOI
TL;DR: The findings in this study demonstrate that vitamin D deficiency or insufficiency may contribute to disease severity in primary hyperparathyroidism.

38 citations

Journal ArticleDOI
TL;DR: The relationship between modulus of elasticity and polymerization shrinkage is the main challenge for maintenance of the adhesive interface, thus composites presenting high shrinkage values, associated with a high modulusof elasticity tend to disrupt the adhesive interfaces under polymerization.
Abstract: Linear polymerization shrinkage (LPS), flexural strength (FS) and modulus of elasticity (ME) of 7 dental composites (Filtek Z350™, Filtek Z250™/3M ESPE; Grandio™, Polofil Supra™/VOCO; TPH Spectrum™, TPH3™, Esthet-X™/Denstply) were measured. For the measurement of LPS, composites were applied to a cylindrical metallic mold and polymerized (n = 8). The gap formed at the resin/mold interface was observed using scanning electron microscopy (1500×). For FS and ME, specimens were prepared according to the ISO 4049 specifications (n = 10). Statistical analysis of the data was performed with one-way ANOVA and the Tukey test. TPH Spectrum presented significantly higher LPS values (29.45 µm). Grandio had significantly higher mean values for FS (141.07 MPa) and ME (13.91 GPa). The relationship between modulus of elasticity and polymerization shrinkage is the main challenge for maintenance of the adhesive interface, thus composites presenting high shrinkage values, associated with a high modulus of elasticity tend to disrupt the adhesive interface under polymerization.

37 citations

Journal ArticleDOI
01 Sep 2005
TL;DR: A pesquisa qualitativa realizada, na cidade do Recife, de marco a julho de 2003, em cinco unidades publicas de referencia, utilizando analise de conteudo for compreender os "nucleos de sentido" das mensagens of 40 entrevistas semi-estruturadas com pediatras e sete enfermeiras da urgencia/emergencia as mentioned in this paper.
Abstract: OBJETIVOS: conhecer os sentimentos de profissionais dos servicos de pronto-socorro infantil diante das situacoes de trabalho, focalizando os componentes do burnout: exaustao emocional, falta de envolvimento pessoal e despersonalizacao. METODOS: pesquisa qualitativa realizada, na cidade do Recife, de marco a julho de 2003, em cinco unidades publicas de referencia, utilizando analise de conteudo para compreender os "nucleos de sentido" das mensagens de 40 entrevistas semi-estruturadas com pediatras e sete enfermeiras da urgencia/emergencia. RESULTADOS: nesses relatos convivem sentimentos dispares: cansaco, esgotamento, angustia e revolta pela sobrecarga e limitacoes dos recursos frente as situacoes que envolvem risco de vida, permeados pela satisfacao de gostar do que fazem e reconhecimento da propria utilidade; temor de cometer enganos fatais; desqualificacao profissional quando comparam remuneracao com responsabilidade e esforco empregado; exposicao ao risco de agressao e indiciamento judicial alimentando desesperanca e vulnerabilidade; e vinculo afetivo com trabalho. Esbocam-se, sobretudo entre medicos com menor tempo de formados, o descredito nas possibilidades de mudancas e a vontade de desistir. CONCLUSOES: apesar do estresse laboral cronico, os profissionais entrevistados mantem o compromisso de contribuir na solucao dos problemas cotidianos. Existe tendencia para exaustao emocional, desânimo e sentimentos de inadequacao e fracasso, reforcando a importância da promocao e prevencao em saude no ambiente de trabalho.

37 citations

Journal ArticleDOI
TL;DR: In this paper, the authors use a heterogeneous agent-based two-state sociophysics model to simulate financial markets and propose a model with two kinds of individual traders, the contrarian agent and the noise trader, where the dynamics of buying and selling investors are governed by local and global interactions.
Abstract: We use a heterogeneous agent-based two-state sociophysics model to simulate financial markets. Focusing on stock market trader dynamics, we propose a model with two kinds of individual – the contrarian agent and the noise trader – in which the dynamics of buying and selling investors are governed by local and global interactions. We define an antiferromagnetic coupling that relates the option of contrarian agents to global magnetization and a ferromagnetic interaction that connects noise traders to their local neighborhood. Our model presents such stylized facts of real financial markets as clustered volatility, power-law distributed returns, and the long-time correlation of the absolute returns with exponential decay. We also observe that the distribution of logarithmic returns can be fitted by the Student’s t distribution in which its degree of freedom changes with the percentage of contrarian agents in the market.

37 citations

Journal ArticleDOI
TL;DR: The restorative material was found to have an influence on the diagnosis of secondary caries lesions by imaging and materials with greater radiopacity, higher than that of enamel, were favourable for a true-negative diagnosis.
Abstract: Objectives: The aim of this study was to evaluate the influence of restorative materials on false-positive diagnoses of secondary caries using three imaging systems. Methods: Class II preparations were made on the occlusal and mesial or distal faces of extracted healthy third molar teeth. The teeth were divided into five groups and, with the exception of Group 5, they received a flow resin base. Groups 1, 2, 3 and 4 received a layer of Natural Flow (DFL, Rio de Janeiro, Brazil), Filtek Flow (3M-ESPE, St. Paul, MN), Tetric Flow (Ivoclar/Vivadent, Liechtenstein, Germany) and Protect Liner F (Kuraray, Okayama, Japan) resins, respectively, and were restored with Filtek Supreme resin (3M-ESPE). Group 5 was restored with Filtek Supreme resin. The images on film and on the Digora Optime® (Helsinki, Finland) and charge coupled device (CCD) IOX (IOX, Monninkyla, Finland) digital systems were evaluated by five examiners and the data were analysed using the Fisher's exact and Friedman tests at a 5% level of signific...

37 citations


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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202314
202261
2021840
2020823
2019571
2018547