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Development of an experimental apparatus to determine impact response of articu...
Alves, Janete; Correia, Pedro Miguel Cerqueira; Peixinho, Nuno; Flores, PauloThe articulations are subject to static and dynamic loads during daily living. Small impact forces can cause damage on articular surfaces as a result of repetitive impact stress. This paper describes a project for a drop tower to allow dynamic impact test in cartilage tissue aiming to understand the mechanics of the cartilage response to impact and seeking to obtain dynamic properties of cartilage, that are rel...
Influence of NO2 and metal ions on oxidation of aqueous-phase S(IV) in atmosphe...
Martins,Cláudia R.; Alves,Janete J.F.; Carvalho,Wanessa B.D.; Cardoso,Cristiane S.C.; Andrade,Jailson B. deAn investigation was made of the influence of atmospheric concentrations (15 or 130 ppbv) of NO2 on the aqueous-phase oxidation rate of S(IV) in the presence and absence of Fe(III), Mn(II) and Cr(VI) metal ions under controlled experimental conditions (pH, T, concentration of reactants, etc.). The reaction rate in the presence of the NO2 flow was slower than the reaction rate using only clean air with an initia...
Oxidation of sulfur (IV) by oxygen in aqueous solution: role of some metal ions
Martins,Claudia R.; Cabral Neto,Clodovil A; Alves,Janete J.F.; Andrade,Jailson B. deCatalytic effect of metal ions: Cr(VI), Cr(III), Cd(II), V(V) and chloride anion, on the oxidation of S(IV) in aqueous solution, at concentrations of metal ions and S(IV) usually found in urban atmospheres, were studied under controlled experimental conditions (pH (2.1 - 4,5), T (25.0 - 35.0 °C), air flow rate, concentration of reactants, etc...). The kinetic constant determined at 25.0 °C and pH range (2.1 - 4...
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