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Mostrando 1-12 de 455 artigos, teses e dissertações.
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1. SYNTHESIS OF TOLUENE DIISOCYANATE URETHANE PREPOLYMER USING CASTOR OIL AND EVALUATION OF MECHANICAL PROPERTIES
This research is the synthesis of urethane prepolymer cast elastomer which had been produced using toluene diisocyanate and castor oil to replace the synthetic polyol, from petroleum origin, and the evaluation of mechanical properties of the polyurethane. The focus was to replace polyol from petroleum to vegetable material looking for renewable resources. Th
Química Nova. Publicado em: 2022
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2. Quantification of Discontinuities in Welded Joints Using Gamma Tomography
Gamma tomography was used in this work to evaluate the recurrent defects in welding processes in naval steel sheets. It was used a first-generation equipment consisting of a source of Cesium-137, with activity of the order of 200 mCi, coupled to a Thallium-doped Sodium Iodide detector, NaI (Tl). For the study, specimens were produced in ASTM A131-AH36 steel
Mat. Res.. Publicado em: 20/12/2019
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3. A PERCEPÇÃO DA MATEMÁTICA EM LIVROS DIDÁTICOS DE QUÍMICA
RESUMO: Neste artigo dirigimos nossa atenção para a percepção da Matemática em livros didáticos de Química por professores, estudantes de pós-graduação em Educação Matemática. Nosso aporte teórico é a Semiótica Peirceana, mais especificamente a teoria da percepção, e a abordagem interdisciplinar entendida como possibilidade de integrar, art
Ens. Pesqui. Educ. Ciênc. (Belo Horizonte). Publicado em: 25/11/2019
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4. FUZZY MODELING OF THE EFFECTS OF IRRIGATION AND WATER SALINITY IN HARVEST POINT OF TOMATO CROP. PART II: APPLICATION AND INTERPRETATION
ABSTRACT Tomato, the most popular greenery, is characterized by being a demanding crop in water and when in prolonged and severe drought, has limitations in its growth and reduction in productivity. In addition, this vegetable is affected by excess salinity in the water, which causes leaf wilting, apex and leaf edges burn until their death. Such effects gene
Eng. Agríc.. Publicado em: 19/06/2019
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5. Performance of the Gail and Tyrer-Cuzick breast cancer risk assessment models in women screened in a primary care setting with the FHS-7 questionnaire
Abstract Breast cancer (BC) risk assessment models base their estimations on different aspects of a woman’s personal and familial history. The Gail and Tyrer–Cuzick models are the most commonly used, and BC risks assigned by them vary considerably especially concerning familial history. In this study, our aim was to compare the Gail and Tyrer-Cuzick mode
Genet. Mol. Biol.. Publicado em: 03/06/2019
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6. Numerical fundamentals and interactive computer graphics system for the nonlinear analysis of planar frames
Abstract Recent scientific and computational advances have facilitated the analysis of slender structural systems subject to instability. With the employment of more sophisticated numerical tools and algorithms, it is possible to accurately determine the critical points (limit and bifurcation loads) as well as the post-critical behavior of the structural sys
REM, Int. Eng. J.. Publicado em: 2019-06
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7. Divergences between the Brazilian national information systems for recording deaths from venomous animals
Abstract Background: This paper aims to highlight and analyze discrepancies in reporting of deaths due to venomous animals in Brazil, from 2001 to 2015, between two national information systems: The Notifiable Diseases Information System (Sistema de Informação de Agravos de Notificação - SINAN) and the Mortality Information System (Sistema de Informaç�
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 20/05/2019
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8. Area Triangulation Method for Automatic Detection of Venous Emptying Maneuvers
Abstract Venous refilling time (VRT) can diagnose the presence of venous diseases in lower limbs. In order to calculate VRT it is necessary to determine the End of the Emptying Maneuvers (EEM). First Derivative Method (FDM) can be employed for automatic detection of the EEM, but its sensitivity to artifacts and noise can degrade its performance. In contrast,
Braz. arch. biol. technol.. Publicado em: 13/05/2019
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9. Venturino: análise da variação de pressão em um tubo de Venturi utilizando Arduino e sensor de pressão
Resumo Geralmente os laboratórios didáticos das escolas de ensino médio e das instituições de ensino que ofertam graduações em Física e áreas correlatas não possuem equipamentos e/ou práticas experimentais sobre hidrodinâmica. Aplicações de relevância tecnológica tais como o tubo de Pitot ou o tubo de Venturi são estudados, geralmente, como
Rev. Bras. Ensino Fís.. Publicado em: 18/02/2019
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10. A utilização do software Maxima no ensino por investigação da evolução estelar utilizando simulação gráfica da fusão nuclear
Resumo Tem sido tema comum, nas propostas curriculares, o estudo e experiências de observação do céu e dos principais fenômenos relacionados, a fim de possibilitar a compreensão de características da Terra, do Sol, da Lua e de outros corpos celestes. Recentemente, a proposta de BNCC (Base Nacional Curricular Comum) destaca a necessidade do ensino de a
Rev. Bras. Ensino Fís.. Publicado em: 07/01/2019
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11. Timing carbon turnover (δ13C) in weaned piglet’s brain by IRMS
Abstract Isotope-ratio mass spectrometry (IRMS) is a potential tool that provides time-integrated estimate of assimilated and not just ingested nutrients. This feature turned possible its application to evaluate the effects of dietary nucleotides and glutamate on carbon turnover (δ13C) in the brain of weanling piglets. Eighty-seven piglets weaned at 21-day-
An. Acad. Bras. Ciênc.. Publicado em: 26/07/2018
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12. Experimental exploratory study of failure modes in models of wooden rectangular beams of Hymenae spp
ABSTRACT According to the study of mechanical properties, wood is an elastic or elastoplastic material that presents different structural behaviour when tensioned or compressed. From the viewpoint of elasticity, wood is considered anisotropic, or rather it is a material with elastic properties that vary with the direction considered. During tree growth, the
Matéria (Rio J.). Publicado em: 05/03/2018