Abílio Azenha

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− − − − In this paper the implementation of several variable structure algorithms in the position/force hybrid control of robotic manipulators is studied. The robustness and performances of the system are analyzed both in terms of time and frequency responses. This paper also studies the impact phenomena and it is demonstrated that the transient response,(More)
patient developed occupational dermatitis from butylene glycol in a soap (9, 10). 2 large-scale group studies, including 364 and 272 patients, give frequencies of contact allergy to 1,3-butylene glycol of 0.4% and 1.1%, respectively , of patients tested (1, 2). Although 1,3-butylene glycol has been considered a safe cosmetic ingredient and a rare contact(More)
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