32 resultados para Designación general de material
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Dissertação de mestrado integrado em Engenharia de Materiais
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Dissertação de mestrado integrado em Engenharia de Materiais
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Dissertação de mestrado integrado em Engenharia Biomédica
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The sol-gel method was employed in the synthesis of di-urethane cross-linked poly(-caprolactone) (d-PCL(530)/siloxane biohybrid ormolytes incorporating copper perchlorate, (Cu(ClO4)2). The highest ionic conductivity of the d PCL(530)/siloxanenCu(ClO4)2 system is that with n = 10 (1.4 x 10-7 and 1.4 x 10-5 S cm-1, at 25 and 100 ºC, respectively). In an attempt to understand the ionic conductivity/ionic association relationship, we decide to inspect the chemical environment experienced by the Cu2+ ions in the d-PCL(530)/siloxane medium. The observed EPR spectra are typical of isolated monomeric Cu2+ ions in axially distorted sites. The molecular orbital coefficients obtained from the EPR spin Hamiltonian parameters and the optical absorption band suggests that bonding between the Cu2+ and its ligand in the ormolytes are moderately ionic. Investigation by photoluminescence spectroscopy did not evidence or allow selective excitation of transitions corresponding to complexed Cu2+ species.
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Degree of Doctor of Philosophy of Structural/Civil Engineering
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Tese de Doutoramento em Ciências da Literatura (área de especialização em Literatura Comparada).
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Dissertação de mestrado integrado em Engenharia Civil
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Dissertação de mestrado integrado em Engenharia Civil
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BACKGROUND: General anesthetics (GA) are well known for the ability to induce a state of reversible loss of consciousness and unresponsiveness to painful stimuli. However, evidence from animal models and clinical studies show that GA exposure may induce behavioral changes beyond acute effects. Most research and concerns are focused on changes in cognition and memory. METHODS: We will look at effects of GA on behavior that is mediated by the dopaminergic system. RESULTS: Pharmacological resemblance of GA with drugs of abuse, and the complexity and importance of dopaminergic systems in both reward seeking and addictive illnesses make us believe that it deserves an overview about what is already known and what matters to us as healthcare workers and specifically as anesthesiologists. CONCLUSION: A review of available evidence strongly suggests that there may be a link between the effects of GA on the brain and substance abuse, partly explained by their influence on the dopaminergic system.
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Dissertação de mestrado em Comunicação, Arte e Cultura
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Dissertação de mestrado em Direito Judiciário (Direitos Processuais e Organização Judiciária)
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Dissertação de mestrado em Direito Judiciário
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"Series title: Springerbriefs in applied sciences and technology, ISSN 2191-530X"
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Tese de Doutoramento em Engenharia Mecânica.
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Tese de Doutoramento em Engenharia Civil (área de especialização em Engenharia de Estruturas).