Polycarbonate
Mostrando 1-12 de 145 artigos, teses e dissertações.
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1. Indications for accurate and appropriate use of personal protective equipment for healthcare professionals. A systematic review
ABSTRACT BACKGROUND: The speed of the spread of coronavirus disease 2019 (COVID-19) has put enormous pressure on hospitals and other healthcare facilities. This, together with blockages in several countries, has hindered the availability and accessibility of the necessary personal protective equipment (PPE). OBJECTIVE: To identify, systematically evaluat
Sao Paulo Medical Journal. Publicado em: 2022
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2. Avaliação dos impactos ambientais de um processo industrial utilizando como matéria-prima policarbonatos virgem e reciclado
RESUMO Os impactos ambientais gerados por processos produtivos é um assunto em crescente evidência no mundo organizacional, e a análise comparativa de processos vem sendo utilizada pelas empresas para verificar os impactos ambientais e suas principais fontes de emissões. A análise dos impactos de um processo produtivo, com dois contextos distintos para
Eng. Sanit. Ambient.. Publicado em: 20/12/2019
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3. Evaluation of Fracture Toughness of Ultraviolet-Irradiated Polycarbonate Using the Essential Work of Fracture Method
The essential work of fracture (EWF) method provides useful parameters to characterize the fracture toughness of polymers exposed to degrading environments under conditions associated with plane-stress state of failure. Exposure of polymeric engineering materials to ultraviolet (UV) radiation may produce macromolecular changes that impair their fracture toug
Mat. Res.. Publicado em: 26/07/2018
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4. Hybrids membranes with potential for fuel cells – Part 3: extruded films of nanocomposites based on sepiolite and PC/sulfonated PC blends
Abstract Fuel Cells based in polymers are an alternative for the conventional energetic matrices. However, materials currently available still present disadvantages to overcome. Membranes of polycarbonate (PC)/sulfonated polycarbonate (PCs) blend/sepiolite nanocomposites have previously been studied by the authors, resulting in good mechanical properties an
Polímeros. Publicado em: 21/05/2018
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5. FT-IR methodology (transmission and UATR) to quantify automotive systems
Abstract When using Fourier transform infrared spectroscopy (FT-IR) under the qualitative aspect for characterization of polymer blends, often a simple identification of each one of the existing polymers in the blend does not justify the material failure since different amounts of each component may result in different mechanical properties, which should be
Polímeros. Publicado em: 15/03/2018
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6. Sensitivity of diagnostic methods for Mansonella ozzardi microfilariae detection in the Brazilian Amazon Region
BACKGROUND The human filarial worm Mansonella ozzardi is highly endemic in the large tributaries of the Amazon River. This infection is still highly neglected and can be falsely negative when microfilariae levels are low. OBJECTIVES This study investigated the frequency of individuals with M. ozzardi in riverine communities in Coari municipality, Brazilian
Mem. Inst. Oswaldo Cruz. Publicado em: 2018-03
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7. Oxidative stress and histopathologic biomarkers of exposure to bisphenol-A in the freshwater fish, Ctenopharyngodon idella
ABSTRACT Bisphenol-A (BPA) belongs to the family of endocrine disrupting chemicals (EDCs) and it is used in the production of polycarbonate plastic and epoxy resins. The reproductive toxicity of BPA is well documented but it also exerts its toxic effects through multiple pathways especially by inducing a state of oxidative stress and causing damage to the vi
Braz. J. Pharm. Sci.. Publicado em: 01/02/2018
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8. Analysis and modeling of simulated residual stress of mold injected plastic parts by using robust correlations
ABSTRACT The injection molding process is the most widely used processing technique for polymers. The analysis of residual stresses generated during this process is crucial for the part quality assessment. The present study evaluates the residual stresses in a tensile strength specimen using the simulation software Moldex3D for two polymers, polypropylene an
Matéria (Rio J.). Publicado em: 02/10/2017
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9. Experimental and Numerical Investigation of Perforation of Thin Polycarbonate Plate by Projectiles of Different Nose Shape
Abstract The present study is based on experimental investigation and numerical simulation of impact of different nose shape projectiles on thin polycarbonate plates. Rigid hardened projectiles of two different geometries (Blunt and Truncated cone) keeping the same shank diameter and total mass were prepared. These projectiles were impacted through pneumatic
Lat. Am. j. solids struct.. Publicado em: 2017-02
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10. Evaluation of the force generated by gradual deflection of orthodontic wires in conventional metallic, esthetic, and self-ligating brackets
ABSTRACT Objective: The purpose of this study was to evaluate the deflection forces of Nitinol orthodontic wires placed in different types of brackets: metallic, reinforced polycarbonate with metallic slots, sapphire, passive and active self-ligating, by assessing strength values variation according to gradual increase in wire diameter and deflection and co
J. Appl. Oral Sci.. Publicado em: 2016-10
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11. Nano and Micro Ceramic Membranes from Degradable Templates
Abstract The nano/microstructures with highly porous surface area have attracted tremendous attention, particularly the synthesis and tailoring of porous and hollow materials of high performance. In this paper, an easy method of cost-effective synthesis of hollow ceramic fiber membranes based on Hydroxyapatite, TiO2 and ZrO2 stabilized with Yttrium, is propo
Mat. Res.. Publicado em: 28/07/2016
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12. Reinforced Transparencies for Aerospace Application – Case Description
ABSTRACT This paper describes the polycarbonate acrylic laminated development that can be applied in aeronautics and aerospace transparencies. The case studied is a laminated double-curved transparency (bubble form) used in an observation side window of a military aircraft. Side windows need strength and specific characteristics, similar to windshields, allo
J. Aerosp. Technol. Manag.. Publicado em: 2016-03