5 resultados para ELECTROPOLISHING (EP)
em SAPIENTIA - Universidade do Algarve - Portugal
Resumo:
Dissertação de Mestrado, Gestão da Água e da Costa, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2008
Resumo:
In order to produce packaging films with a broad spectrum of action on microorganisms, the
effect of two antimicrobial (AM) to be included in the films, carvacrol and GSE were studied
separately on different microorganisms. Carvacrol was more effective against the grampositive
bacteria than against the gram-negative bacterium. GSE was not effective against
yeast. Subsequently, a search for optimal combinations of carvacrol, GSE and the addition of
chitosan (as a third component with film forming properties) was carried out. Response
surface analysis showed several synergetic effects and three optimal AM combinations
(OAMC) were obtained for each microorganism. The experimental validation confirmed that
the optimal solutions found can successfully predict the response for each microorganism.
The optimization of mixtures of the three components, but this time, using the same
concentration for all microorganisms, was also studied to obtain an OAMC with wide spectrum
of activity. The results of the response surface analysis showed several synergistic effects for
all microorganisms. Three OAMC, OAMC-1, OAMC-2, OAMC-3, were found to be the optimal
mixtures for all microorganisms. The radical scavenging activity (RSA) of the different agents
was then compared with a standard antioxidant (AOX) BHT, at different concentrations; as also
at the OAMC. The RSA increased in the following order: chitosan
Resumo:
The growing number of robotic solutions geared to interact socially with humans, social robots, urge the study of the factors that will facilitate or hinder future human robot collaboration. Hence the research question: what are the factors that predict intention to work with a social robot in the near future. To answer this question the following socio-cognitive models were studied, the theory of reasoned action, the theory of planned behavior and the model of goal directed behavior. These models purport that all the other variables will only have an indirect effect on behavior. That is, through the variables of the model. Based on the research on robotics and social perception/ cognition, social robot appearance, belief in human nature uniqueness, perceived warmth, perceived competence, anthropomorphism, negative attitude towards robots with human traits and negative attitudes towards interactions with robots were studied for their effects on attitude towards working with a social robot, perceived behavioral control, positive anticipated emotions and negative anticipated emotions. Study 1 identified the social representation of robot. Studies 2 to 5 investigated the psychometric properties of the Portuguese version of the negative attitude towards robots scale. Study 6 investigated the psychometric properties of the belief in human nature uniqueness scale. Study 7 tested the theory of reasoned action and the theory of planned behavior. Study 8 tested the model of goal directed behavior. Studies 7 and 8 also tested the role of the external variables. Study 9 tested and compared the predictive power of the three socio-cognitive models. Finally conclusion are drawn from the research results, and future research suggestions are offered.
Resumo:
Dissertação de mestrado, Ciências da Educação e Formação, Faculdade de Ciências Humanas e Sociais, Universidade do Algarve, 2015
Resumo:
Dissertação de Mestrado, Arquitetura Paisagista, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2015