Testing for volatility persistence change: The effect of the credit crisis on the Portuguese banks

A Work Project, presented as part of the requirements for the Award of a Masters Degree in Finance from the NOVA – School of Business and Economics

Upgrade of an experimental volumetric unit for gas adsorption equilibrium studies

In this work, a volumetric unit previously assembled by the research group was upgraded. This unit revamping was necessary due to the malfunction of the solenoid valves employed in the original experimental setup, which were not sealing the gas properly leading to erroneous adsorption equilibrium measurements. Therefore, the solenoid valves were substituted by manual ball valves. After the volumetric unit improvement its operation was validated. For this purpose, the adsorption equilibrium of carbon dioxide (CO2) at 323K and 0 - 20 bar was measured on two different activated carbon samples, in the of extrudates (ANG6) and of a honeycomb monolith (ACHM). The adsorption equilibrium results were compared with data previously measured by the research group, using a high-pressure microbalance from Rubotherm GmbH (Germany) – gravimetric. The results obtained using both apparatuses are coincident thus validating the good operation of the volumetric unit upgraded in this work. Furthermore, the adsorption equilibrium of CO2 at 303K and 0 - 10 bar on Metal-Organic Frameworks (MOFs) Cu-BTC and Fe-BTC was also studied. The CO2 adsorption equilibrium results for both MOFs were compared with the literature results showing good agreement, which confirms the good quality of the experimental results obtained in the new volumetric unit. Cu-BTC sample showed significantly higher CO2 adsorption capacity when compared with the Fe-BTC sample. The revamping of the volumetric unit included a new valve configuration in order to allow testing an alternative method for the measurement of adsorption equilibrium. This new method was employed to measure the adsorption equilibrium of CO2 on ANG6 and ACHM at 303, 323 and 353K within 0-10 bar. The good quality of the obtained experimental data was testified by comparison with data previously obtained by the research group in a gravimetric apparatus.

Estimation and hypothesis testing in mixed linear models

Dissertação apresentada para obtenção do Grau de Doutor em Matemática, Estatística, pela Universidade Nova de Lisboa, faculdade de Ciências e Tecnologia

Testing native speakers of German and Portuguese on the understanding of topological operators-line-region relations in gvSIG

Dissertation submitted in partial fulfilment of the requirements for the Degree of Master of Science in Geospatial Technologies

Design and testing of a radiation hardened 13-bit 80 MS/s pipeline ADC implemented in a 90nm standard CMOS process

Second International Workshop on Analog and Mixed Signal Integrated Circuits for Space Applications (AMICSA 2008), Sintra, Portugal, Setembro de 2008

Massive shift in the pneumococcal nasopharyngeal flora after the 7-valent conjugate vaccine: epidemiological studies and testing pathogenic potential in animal models

Dissertation presented to obtain the PhD degree in Biology/Molecular Biology by Universidade Nova de Lisboa, Instituto de Tecnologia Química e Biológica

Dor crónica lombar : incapacidada auto-reportada em trabalhadores de saúde e sua relação com variáveis psicossociais e intensidade da dor

RESUMO: A dor crónica lombar, é uma condição de saúde cuja prevalência tem aumentado nas últimas décadas. É uma condição que pode ser bastante incapacitante para o indivíduo e por consequência, ter importante impacto social e económico na sociedade. É um fenómeno complexo, multifactorial e pouco estudado na população portuguesa. Objectivo: Estudar a associação entre a catastrofização da dor, crenças de medo evitamento da dor, intensidade da dor e a incapacidade funcional auto reportada em indivíduos com dor crónica lombar. Metodologia: Estudo observacional analítico de corte transversal, com uma amostra de 38 indivíduos com dor crónica lombar, seleccionados a partir de uma população de 186 trabalhadores de uma unidade local de saúde. A recolha de dados foi realizada através de 4 instrumentos de avaliação: Questionário de caracterização e levantamento de factores de risco e impacto associados à dor crónica lombar; Questionário de incapacidade de Roland e Morris; Escala de catastrofização da dor; e Questionário de crenças de medo evitamento da dor. A análise dos dados foi feita através de estatística descritiva pela distribuição de frequências e medidas de tendência central para análise da prevalência e caracterização da amostra e por estatística inferencial para estudar as relações entre variáveis através do teste de correlação não paramétrico de Spearman. Resultados: A variável catastrofização da dor obteve um valor de correlação com a incapacidade auto-reportada de rs=0,473, para p<0,01; a variável crença de medo evitamento da dor relacionada com o trabalho obteve um valor de correlação com a incapacidade auto-reportada de rs=0,462 para p<0,01, a percepção da intensidade actual de dor e a intensidade percepcionada no ano anterior, obtiveram valores de correlação com a incapacidade auto-reportada de rs=0,327 e rs= 0,359 respectivamente para valor de p<0,05. Conclusão: As variáveis psicossociais catastrofização da dor e crença de medo evitamento da dor relacionada com o trabalho, influenciam de forma moderada a incapacidade em indivíduos com dor crónica lombar. A associação entre a intensidade da dor e a incapacidade parece ter um papel menos importante demonstrando associações baixas.--------------------------ABSTRACT: Chronic low back pain is a health condition whose prevalence has increased in recent decades. It is a condition that can be quite disabling for the individual and therefore have important social and economic impact on society. It is a complex phenomenon, multifactorial and poorly studied in the Portuguese population. Objective: To study the association between pain catastrophizing, fear avoidance beliefs, pain, pain intensity and self-reported functional disability in individuals with chronic low back pain. Methods: Observational analytical cross sectional study of a sample of 38 individuals with chronic low back pain, selected from a population of 186 workers at a local health unit. Data collection was performed through four assessment instruments: questionnaire characterization, evaluation of risk factors and impact associated to chronic low back pain, questionnaire Roland and Morris disability, pain catastrophizing scale and fear avoidance beliefs questionnaire. Data analysis was performed using descriptive statistics for the distribution of frequencies and measures of central tendency to analyze the prevalence and characteristics of the sample and inferential statistics to study the relationships between variables by testing for Spearman nonparametric correlation. Results: The pain catastrophizing variable had a correlation value rs= 0,473, p<0,01 with the self-reported disability, the variable of fear avoidance belief of pain related to the work achived a correlation value with the self-reported disability, rs = 0.462 p <0.01, current pain intensity and in the previous year obtained values of correlation with self-reported disability rs = 0.327 and rs = 0.359 respectively for values of p <0.05 .Conclusion: The psychosocial variables of pain catastrophizing and fear avoidance belief of pain related to the work had a moderate association with disability in individuals with chronic low back pain. The association between pain intensity and disability seems to have a less important role demonstrating low associations.

Process engineering of liver cells for drug testing applications

Dissertação para obtenção do Grau de Doutor em Bioengenharia

Novel approaches for culturing hepatocytes for drug testing applications

Dissertation presented to obtain the Ph.D degree in Biochemisry, Biotechnology

Aircraft Engines Maintenance Costs and Reliability: An Appraisal of the Decision Process to Remove an Engine for a Shop Visit Aiming at Minimum Maintenance Unit Cost

Dissertação apresentada como requisito parcial para obtenção do grau de Mestre em Estatística e Gestão de Informação.

How effective are brief interventions in smoking cessation: project of a cohort study in a family health care unit

ABSTRACT: Tobacco use remains the most significant modifiable cause of disability, death and illness1. In Portugal, 19,6% of the population aged ten years or more smoke3. A Cochrane review of 20087 concluded that a brief advice intervention (compared to usual care) can increase the likelihood of a smoker to quit and remain nonsmoker 12 months later by a further 1 to 3 %. Several studies have shown that Primary Care Physicians can play a key role in these interventions8,9,10. However we did not find studies about the effectiveness of brief interventions in routine consultations of Family Doctors in Portugal. For this reason we designed a Cohort Study to make an exploratory study about the effectiveness of brief interventions of less than three minutes in comparison with usual care in routine consultations. The study will be implemented in a Family Healthcare Unit in Beja, during six months. Family Doctors of the intervention group should be submitted for an educational and training program before the study begin. Quit smoking sustained rates will be estimated one year after the first intervention in each smoker. If, as we expect, quit smoking rates will be higher in the intervention group than in the control group, this may change Portuguese Family Doctors attitudes and increase the provision of brief interventions in routine consultations in Primary Healthcare Centers.

Credit risk stress testing: The Portuguese environment, macroeconomic scenarios and the estimation of losses for corporate sectors

A Work Project, presented as part of the requirements for the Award of a Masters Degree in Finance from the NOVA – School of Business and Economics

HIV-related discrimination in Sub-Sahran Africa: Explanatory characteristics and consequences on employment and HIV-testing

A Work Project, presented as part of the requirements for the Award of a Masters Degree in Economics from the NOVA – School of Business and Economics

The impact of the measurement unit of unit price on consumer preference and choice

A Work Project, presented as part of the requirements for the Award of a Masters Degree in Management from the NOVA – School of Business and Economics

Modelling and Forecasting Mortality Patterns

Thesis submitted in partial fulfillment of the requirements for the Degree of Doctor of Statistics and Information Management