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Monofilament composites of Co-continuous Polyamide12/Poly (Methyl Methacrylate)...

Polymer-polymer/carbon nanotube (CNT) composite fibres with a co-continuous morphology were developed, aiming at structural and functional applications. The objective was to produce fibres with electrical conductivity, provided by the incorporation of CNT, maintaining the mechanical properties at a level that allowed typical textile processing. If this goal is achieved, then the fibres may be incorporated into ...

Vigilância da Gravidez na Área de Influência do Hospital de Reynaldo dos Santos

Efectuou-se um estudo prospectivo com base nos dados de um inquérito realizado a 350 puérperas internadas no Hospital de Reynaldo dos Santos entre Agosto e Dezembro de 1993. O objectivo foi caracterizar esta população do ponto de vista clínico e social bem como determinar a incidência de patologia no recém-nascido associada à gravidez não vigiada. Conclui-se ser elevada a incidência de gravidez não vigiada (15....

Mastoidite aguda em idade pediátrica – Fatores de risco para complicações

RESUMO Introdução: A mastoidite aguda (MA) é a complicação mais frequente da otite média aguda (OMA). A antibioticoterapia (AB) e a melhoria dos cuidados de saúde diminuíram drasticamente a sua incidência. Porém, na última década assistiu-se ao recrudescimento da doença. Objetivos: Avaliar características sociodemográficas, clínicas, laboratoriais e terapêuticas da MA e identificar fatores de risco para complic...

Mosaic Trisomy 18 in a Five-Month-Old Infant - Case Report

Individuals with mosaic trisomy 18, only approximately 5% of all trisomy 18 cases, carry both a trisomy 18 and an euploid cell line. Their clinical findings are highly variable, from the absence of dysmorphic features to the complete trisomy 18 syndrome. A five month old daughter of a 38-year-old mother, with vomiting and feeding problems, was referred to our department. She was undernourished and had axial hyp...

Dispersion of carbon nanotubes in polyamide 6 for microinjection moulding

The focus of this study was to investigate the dispersion state of pure and functionalized carbon nanotubes in polyamide 6, on composites prepared by twin-screw extrusion and then processed by microinjection moulding. Nanocomposites were prepared with different carbonvnanotube compositions, with and without functionalization. The nanotubes were functionalized by the 1,3-dipolar cycloaddition reaction. The dispe...

Mastoidite aguda em idade pediátrica – Fatores de risco para complicações

Introducing Srate Constraints in Optimal Control in Health Problems

Graphene nanoribbons from carbon nanotubes

Chemical functionalization of the outer graphene layer of carbon nanotubes (CNT) has been increasingly studied, aiming at the application of CNT in different areas. The functionalization of CNT using the 1,3-dipolar cycloaddition reaction, leading to the formation of cyclic amine groups on the CNT surface [1], was observed to induce the unzipping of the CNT under specific conditions. The CNTs thus functionalize...

Formation of graphene nanoribbons in solution

Recently, the formation of graphene by exfoliation of carbon nanotubes (CNT) has shown increasing interest. This process originates graphene nanoribbons (GNR) that are expected to present excellent electrical properties, depending on their width and on their edge shape [1]. Several methods for the unzipping of graphene from CNT were proposed along the past few years [2-6]. These methods often present some limit...

Functionalization of CNTS with maleic anhydride

The outstanding properties of carbon nanotubes (CNTs) [1] are mainly related with their unique structural features. However, the high π-π staking between the tubes is a major drawback for their manipulation and interaction with other materials. Chemical functionalization has been used as a convenient tool to improve their performance in various applications [2]. The work reports the functionalization of multi-...