Carbon Fibre
Mostrando 13-24 de 32 artigos, teses e dissertações.
-
13. A low-mass neutron flux monitor for the n _TOF facility at CERN
A small-mass system has been developed for monitoring the flux of neutrons with energy up to 1 MeV at the new time-of-flight facility at CERN, n_TOF. The monitor is based on a thin Mylar foil with a 6Li deposit, placed in the neutron beam, and an array of Silicon detectors, placed outside the beam, for detecting the products of the 6Li(n, alpha)³H reaction.
Brazilian Journal of Physics. Publicado em: 2004-09
-
14. Rheological, mechanical and tribological properties of carbon-nanofibre reinforced poly (ether ether ketone) composites
Poly(ether ether ketone) nanocomposites containing vapour-grown carbon nanofibres (CNF) were produced using standard polymer processing techniques. At high shear rates no significant increase in resin viscosity was observed. Nevertheless, the addition of the CNFs results in a higher melt strength at 360°C. Electron microscopy confirmed the homogeneous dispe
Polímeros. Publicado em: 2003-12
-
15. Influence of the Testing Gage Length on the Strength, Young's Modulus and Weibull Modulus of Carbon Fibres and Glass Fibres
Carbon fibres and glass fibres are reinforcements for advanced composites and the fiber strength is the most influential factor on the strength of the composites. They are essentially brittle and fail with very little reduction in cross section. Composites made with these fibres are characterized by a high strength/density ratio and their properties are intr
Materials Research. Publicado em: 2002-10
-
16. Utilização de fibras de carbono como material eletrodico na construção de sensores e biossensores
This thesis describes the use of carbon fibres as electrodic material for the construction of sensors and biosensors. Although carbon fibres have several advantages as electrodic material, their pre-treatment is necessary in order to enhance reproducibility and electrochemical activity. A simple and fast method for its activation is proposed to improve the e
Publicado em: 2001
-
17. Processamento de compósitos C-SiCxOy via pirólise polimérica para aplicações termo estruturais / Processing of SICxOy composites by polymeric pyrolysis to thermo-structural applications
Composites are heterogeneous materials made by one or more types of reinforcements, disposed or not in a definied direction, which is dispersed in a ceramic, metallic or polymeric matrix. The combination of these materials permits that the intrinsic properties from each one of the components contribute in the formation of a new material having characteristic
Publicado em: 2000
-
18. Modelling of mechanical properties of CRFC composites under flexure loading
Carbon Fibre Reinforced Carbon (CFRC) Composites are increasing their applications due to their high strength and Young’s Modulus at high temperatures in inert atmosphere. Although much work has been done on processing and structure and properties relationship, few studies have addressed the modelling of mechanical properties. This work is divided in two p
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2000
-
19. Bio-oleo obtido por hidropirolise de biomassa como precursor de materiais carbonosos
The main objective is oxygen reduction in bio-oils from biomass thermochemical conversion for carbon fibres precursor. Pure cellulose, eucalyptus wood and sugar cane bagasse were pyrolysed under high hydrogen pressure in a fixed bed reactor. Cellulose was a model compound, wood and bagasse as natural raw materiaIs in Brazilian rural areas. Hydropyrolysis wit
Publicado em: 1997
-
20. Polyneuropathy induced by carbon disulphide in viscose rayon workers.
OBJECTIVES--To understand the prevalence of polyneuropathy and correlations among the clinical manifestations, electrophysiological findings, and degree of exposure to carbon disulphide (CS2) in workers who were exposed to variable concentrations of CS2 in a viscose rayon factory. METHODS--All the 163 workers received a detailed physical and neurological eva
-
21. Developmental changes in hypoxia-induced catecholamine release from rat carotid body, in vitro.
1. Developmental changes in free tissue catecholamine levels were studied using Nafion-coated, carbon fibre electrodes placed in rat carotid bodies, in vitro. Simultaneously, single fibre chemoreceptor afferent activity was recorded from the sinus nerve. Five age groups were examined: 1, 2, 6, 10 and 20-30 days of age. 2. Using fast-scan voltammetry, similar
-
22. Rebreathing expired gases from bedding: a cause of cot death?
The reported association of cot death and sleeping prone could be due to rebreathing of expired gases. A mechanical model simulating the respiratory system of an infant, exhaling warm humidified air with an end tidal carbon dioxide of 5%, has been used to investigate this. Some commonly used bedding materials caused an accumulation of carbon dioxide of 7% to
-
23. Laser injury of peripheral nerve: a model for focal endoneurial damage.
A model of endoneurial oedema is presented which produces localised nerve fibre injury including Wallerian degeneration, endoneurial oedema and increased endoneurial fluid pressure. A carbon dioxide laser was used to irradiate rat sciatic nerve and quantitative results were collected 2 days and 6 days after irradiation. The increase in endoneurial fluid pres
-
24. Experimental study on the enhancement of the neurotoxicity of methyl n-butyl ketone by non-neurotoxic aliphatic monoketones.
The neurotoxicity of methyl n-butyl ketone is known to be enhanced by combination with methyl ethyl ketone. This study was conducted to clarify the potentiating effect of aliphatic monoketones on the neurotoxicity of methyl n-butyl ketone. Rats were subcutaneously injected in the back with 4 mmol/kg/day of methyl ethyl ketone, methyl n-propyl ketone, methyl