Browsing by Author "Rodrigues, Ana Maria"
Now showing 1 - 3 of 3
Results Per Page
Sort Options
- Alternating-current and direct-current electrical transport properties of diamond diodes with diamond surfaces of the different morphologyPublication . Rodrigues, Ana Maria; Palermo, C.; Bastard, G.The alternating current (ac) conductance (f=200 Hz) was measured as a function of applied voltage at ambient temperature for two diodes with aluminium/diamond rectifying contacts on chemical vapour-deposited diamond films of 5 pm in thickness with different morphology, nucleation and growth surfaces. Comparison of direct current (dc) conductance curves (deduced from experimental current voltage curves) with ac conductance curves for the diodes revealed different transport mechanisms for two interfaces. The current voltage characteristic of gold/diamond/gold structures shows that the two interfaces have different resistance values. The results demonstrate that the nucleation surface has a greater surface density of states than the growth surface, and this contributes to electrical transport through the potential barrier. Cole Cole curves show a discrepancy between the Debye semicircle and experimental results and illustrate the fundamental differences between the two diodes. These results provide additional proof that the principal source of dispersion admittance is the surface states. The current voltage characteristic of diamond diodes with diamond films of 1 pm in thickness shows two distinct resistance states (high and low resistance). By applying an appropriate bias, resistance switching from one state to the other state can be achieved. The experimental results are discussed on the basis of filamentary conduction
- Dynamics in cultural spaces in the historic center of Portimão, PortugalPublication . Rodrigues, Ana Maria; Pires Rosa, Manuela; Rebelo, EfigénioO objetivo deste estudo consiste na construção de indicadores referentes ao desempenho dos espaços culturais da cidade de Portimão, Algarve, Portugal, que se encontram inseridos numa rota pedonal, a Rota Turística Acessível de Portimão. Trata-se do Museu de Portimão, espaço cultural que expressa a história da indústria conserveira local, e do Teatro Tempo, localizado num edifício também ele histórico, onde se dinamizam atividades na área da representação. Ambos os edifícios consistem em objetos arquitetónicos com valor patrimonial e reabilitados para espaços culturais. A metodologia aplicada carateriza-se por uma base teórica, pela recolha e análise de dados quantitativos. O conhecimento teórico advém de uma revisão de literatura, em áreas e.g.: turismo cultural, turismo acessível, património e reabilitação urbana. Os dados quantitativos são provenientes da recolha de dados dos espaços culturais Teatro Tempo e Museu de Portimão: número de visitantes/espectadores e número de sessões e atividades desde 2008-2018. Com este estudo pode-se concluir que os espaços culturais Museu de Portimão e Teatro Tempo são usufruídos não só pelos residentes, mas também por visitantes, na cidade de Portimão. A presente análise defende a importância do investimento na reabilitação urbana, na valorização patrimonial e nos espaços culturais para a construção de um turismo cultural acessível e sustentável.
- Sex and body mass index impact on digit circumference for Leeds Dactylitis Index calculationPublication . António, Manuel Silvério; Rodrigues, Ana Maria; Teixeira, Filipa; Costa, José Tavares; Bernardo, Alexandra; Pimenta, Sofia; Gomes, João Lagoas; Aguiar, Renata; Videira, Taciana; Pinto, Patrícia; Santos, Helena; Sequeira, Graça; Teixeira, Lídia; Ribeiro, Ruy Miguel; Fonseca, João Eurico; Sousa, Elsa VieiraObjective. To estimate digit circumference and the impact of sex and body mass index (BMI) for the calculation of the Leeds Dactylitis Index (LDI) in psoriatic arthritis (PsA) patients with bilateral dactylitis. Methods. Digit circumference of the hands and the foot were measured with a dactylometer and were studied according to sex and BMI (divided in 4 weight categories) in healthy Portuguese subjects, using Student's t-test and One-way ANOVA, respectively. The effect size of sex and BMI were calculated using Cohen's d test and Eta squared, respectively. Multiple linear regression was used to calculate the effect of sex and BMI, as well as their interaction, to create a formula to predict digit circumference. Results. Fifty-nine participants (33 women, 26 men) with a mean BMI of 24.8 were included. Men's mean digit circumferences were statistically higher than those of women (p<0.001), with a large sex effect size in most of the digits. Differences in the mean circumference between the four BMI categories were statistically significant (p<0.05) for all digits, with a large BMI effect size. Sex and BMI were independent variables to predict mean digit circumference (p<0.001). A new tool (based on regression analysis) allowing to estimate the circumference of digits for males and females of different BMIs is presented. Conclusion. Our data allows the calculation of digit circumference for males and females of different BMIs in the Portuguese population; and shows that BMI influences digital circumference supporting BMI inclusion in LDI references tables.