Dies
Mostrando 1-12 de 117 artigos, teses e dissertações.
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1. Tendência do número de vítimas em acidentes de trânsito nas rodovias federais brasileiras antes e depois da Década de Ação pela Segurança no Trânsito
Resumo: O objetivo deste estudo foi analisar a tendência do número de mortos, feridos graves e feridos leves por acidentes de trânsito nas rodovias federais brasileiras, segundo macrorregião, antes e depois do início da Década de Ação pela Segurança no Trânsito (DAST). Trata-se de estudo de séries temporais interrompidas com dados sobre acidentes
Cad. Saúde Pública. Publicado em: 29/08/2019
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2. Lithopedion in a Geriatric Patient
Abstract Lithopedion (lithos = rock and paidion = child) is a rare condition that only occurs in 1.5 to 1.8% of extrauterine pregnancies and in 0.00045% of all pregnancies. It consists of an ectopic pregnancy in which the fetus dies but cannot be reabsorbed by the mother’s body, which then coats it in a calcium-rich substance.We present the case of a 77-ye
Rev. Bras. Ginecol. Obstet.. Publicado em: 15/04/2019
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3. Simulación computacional de un ensayo Erichsen aplicado a una chapa de acero DC-06
ABSTRACT Nowadays, the use of computer simulation on forming processes as stamping and its variants, is an habitual development activity of big industries, and also it is slowly being introduced in SME (Small and Mediumsize Enterprise). One of the main advantages of it is application lies-in the reduction of costs regarding new projects, products and process
Matéria (Rio J.). Publicado em: 19/07/2018
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4. Numerical and Experimental Studies of Compression-Tested Copper: Proposal for a New Friction Correction
New empirical relationship is proposed to calculate instantaneous maximum diameters on the sample during compression test. The proposal is a relationship between instantaneous maximum diameter, friction coefficient, initial dimensions of the sample and the displacement during the compression test. Seventeen compression tests were carried out to copper cylind
Mat. Res.. Publicado em: 28/05/2018
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5. Accuracy of intraoral and extraoral digital data acquisition for dental restorations
ABSTRACT The computer-aided design (CAD) and computer-aided manufacturing (CAM) process chain for dental restorations starts with taking an impression of the clinical situation. For this purpose, either extraoral digitization of gypsum models or intraoral digitization can be used. Despite the increasing use of dental digitizing systems, there are only few st
J. Appl. Oral Sci.. Publicado em: 2016-02
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6. The use of single point incremental forming for customized implants of unicondylar knee arthroplasty: a review
Abstract Introduction The implantable devices are having enormous market. These products are basically made by traditional manufacturing process, but for the custom-made implants Incremental Sheet Forming is a paramount alternative. Single Point Incremental Forming (SPIF) is a manufacturing process to form intricate, asymmetrical components. It forms the co
Res. Biomed. Eng.. Publicado em: 30/10/2015
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7. Crack Propagation Analysis of Magnesium Rod Processed by Extrusion-shear: Numerical Modeling and Experimental Verification
During extrusion-shear (ES) process, the surface cracks would be formed in the processed rod for AZ31 magnesium caused by nonhomogeneous metal flow and stress. To reduce the cracks defects, three-dimensional (3D) finite element method (FEM) of ES on a wrought AZ31 magnesium alloy have been performed. ES process experiments have been also conducted to verify
Mat. Res.. Publicado em: 2015-08
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8. Two-parameter Rigid Block Approach to Upper Bound Analysis of Equal Channel Angular Extrusion Through a Segal 2θ-die
This article deals with a phenomenological description of experimentally determined complex geometric shape of material dead zone during Equal Channel Angular Extrusion (ECAE) through a Segal 2θ-die with a channel intersection angle of 2θ>0°and 2θ<180°. Taking into account the complex dead zone geometry in a 2θ-die, a two-parameter Rigid Block Method (
Mat. Res.. Publicado em: 2015-06
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9. 2D upper bound analysis of ECAE through 2θ-dies for a range of channel angles
Equal Channel Angular Extrusion (ECAE), sometimes referred to as Equal Channel Angular Pressing (ECAP), is a Severe Plastic Deformation technique. However the energy-power parameters of ECAE have not been fully addressed in previous known publications. The present article is focused on the punching pressure, accumulated plastic strain, and dead metal zone ge
Mat. Res.. Publicado em: 26/10/2014
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10. Flow visualization & extrudate swell behavior of natural rubber compound in annular die capillary rheometer
This research aims to study the flow pattern and extrudate swell properties of a Natural Rubber (NR) compound in a constant shear rate capillary rheometer, using two types of annular die: convergent annular and divergent annular. Results revealed that flow patterns that occurred in the barrels of both types of annular dies were significantly different, espec
Polímeros. Publicado em: 2014-08
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11. Respostas diárias do fitoplâncton de um lago da planície de inundação amazônica nas duas principais fases hidrológicas
OBJETIVO: O objetivo deste estudo foi avaliar mudanças em curto prazo da comunidade fitoplanctônica em um lago da planície de inundação do Rio Acre, Amazônia, Brasil. MÉTODOS: As amostras foram coletadas com garrafa de Van Dorn, em três profundidades (superfície, meio e fundo), durante as estações climáticas (seca e chuvosa), durante sete dias co
Acta Limnol. Bras.. Publicado em: 2013-12
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12. Simulação computacional, projeto, construção e análise do desempenho de uma matriz para extrusão em canal angular dedicada ao processamento de chapas / Computational simulation, design, construction and performance analysis of an equal channel angular pressing die for the processing of flat billets
The present work describes the design, construction and testing of an equal channel angular pressing (ECAP) die characterized by rectangular cross section channels. The main parameter of the ECAP dies is the geometry of the channels, given by the angle trough which they meet, and the curvature radii at this point. The material employed in the experiments was
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/08/2012