Produção Fotovoltaica em Autoconsumo e Pequena Produção: Caso de Estudo do ISEP

A presente dissertação insere-se no âmbito da unidade curricular de “Dissertação/Projeto/Estágio”, do 2º ano do mestrado em Engenharia Eletrotécnica – Sistemas Elétricos de Energia. Com o crescente aumento do consumo energético a nível mundial, e consequente esgotamento dos recursos fósseis, surge a necessidade de procurar soluções alternativas para a produção de energia. As energias renováveis aparecem como uma solução sustentável na produção de eletricidade, pois a sua produção representa um menor custo. Este trabalho tem como principais objetivos o dimensionamento de uma central de produção fotovoltaica para o ISEP nos regimes de exploração em autoconsumo e pequena produção, tendo em conta o atual Decreto-Lei (DL) n.º 153/2014, e também a análise de viabilidade económica dessa mesma instalação. O sistema fotovoltaico usado no dimensionamento em autoconsumo e pequena produção foi realizado com recurso ao software PVsyst. Tendo em conta que os consumos do ISEP são bastante inferiores nos períodos de férias escolares e fins-de-semana, e também por haver uma limitação de área disponível para a colocação dos módulos fotovoltaicos, a melhor opção a adotar será um sistema fotovoltaico de 237 kWp, tanto para autoconsumo como para pequena produção. Outro objetivo é a realização de um estudo de viabilidade económica do sistema fotovoltaico dimensionado. Os resultados obtidos permitem então clarificar qual dos regimes de exploração é mais viável para o ISEP, sendo que esses resultados poderão servir de apoio a uma futura decisão, caso o ISEP decida instalar um sistema deste tipo.

Severe Isolated Thrombocytopenia After Clopidogrel and Pentoxifylline Therapy: a Case Report

INTRODUCTION: Clopidogrel is frequently associated with thrombotic thrombocytopenic purpura, however this drug is rarely related to severe isolated thrombocytopenia. Pentoxifylline has previously been associated with thrombocytopenia only once. To the best of our knowledge, this is the first report of severe isolated thrombocytopenia after therapy with both clopidogrel and pentoxyfilline. CASE PRESENTATION: We report the case of a 79-year-old Caucasian man who presented to our facility with intermittent claudication. He had obliterative arterial disease and started therapy with clopidogrel and pentoxifylline. His basal platelet count was 194 × 109 cells/L. At three days after the start of treatment, our patient had lower limb petechia and stopped taking clopidogrel and pentoxifylline. His platelet count lowered to 4 × 109 cells/L and our patient was admitted to hospital. Our patient had purpura with no other hemorrhages or splenomegaly. Results of a blood smear were normal, and a bone marrow study showed dysmegakaryopoiesis. Antiplatelet antibody test results were negative, as were all viral serology tests. Imaging study results were normal. Our patient was given immunoglobulin but there was no sustained platelet increase, so corticotherapy was started as the next treatment step. At five months after clopidogrel and pentoxifylline were discontinued, his platelet count continued increasing even after prednisolone was tapered. CONCLUSIONS: Severe isolated thrombocytopenia may appear as a side effect when using clopidogrel and pentoxifylline. These drugs are widely used by general physicians, internists, cardiologists and vascular surgeons. We hope this report will raise awareness of the need to monitor the platelet count in patients taking these drugs.

High prevalence of malaria infection in Amazonas state, Venezuela

This study was carried out to determine the incidence of malaria in an endemic region of Amazonas State, Venezuela. For this, 200 random samples were collected from symptomatic and asymptomatic individuals from San Fernando de Atabapo and Santa Barbara. Epidemiological factors were related to malaria infection, which was diagnosed by microscopy observation and amplification of the 18S rDNA sequence by PCR. Malaria prevalence in these populations was 28.5%, whilst P. vivax and P. falciparum prevalences were 12 and 17%, respectively. No infection by P. malariae was found. A mixed infection was found on an asymptomatic individual. Prevalence patterns differed between age groups depending on the Plasmodium species. We found that 34.8% of the P. vivax and 15.2% of the P. falciparum infections were asymptomatic. The use of nets was helpful to prevent P. vivax infection, but did not protect against P. falciparum infection. The results suggest the presence of more than one mosquito vector in the area, displaying a differential pattern of infection for each Plasmodium species. There appear to be risk factors associated with malaria infections in some individuals. The population based approach and PCR diagnosis improved the accuracy of the statistical analysis in the study.

On the unknown ecological niche of Paracoccidioides brasiliensis: our hypothesis of 1989: present status and perspectives

In 1989, CONTI DÍAZ & RILLA published a hypothesis concerning the as yet unknown ecological niche of Paracoccidioides brasiliensis. The hypothesis proposed a highly efficient paracoccidioidal ecological strategy based on an important natural reservoir of the parasite, probably in heterothermic animals from fresh water environments. Further, the hypothesis proposed, a transient and variable residence in the soil with a wide aleuriospore dispersion throughout the environment together with an elevated capability of infecting humans, and domestic and wild animals. This paper analyzes scientific publications from the IX International Meeting on Paracoccidioidomycosis held in Águas de Lindoia, São Paulo, Brazil from 2-5 October 2005, providing a comparative study among this articles and with other recently published papers and the hypothesis' postulates. Since various findings and observations appear to agree with the postulates, the pursuit of novel, specific research projects in the supposed reservoirs is recommended partially or fully to confirm the hypothesis using classical laboratorial methods and modern molecular biology techniques.

Organizational Culture in Cooperatives: an exploratory approach

In recent years, organizational culture has become one of the common themes of interest of scientific and academic research. Each organization has its own unique cultural identity. Based on the recognition that organizational culture is considered important to an organization’s results, and social economy organizations are concerned with improving managerial practices and results, our objective is to study organizational culture in cooperatives: identifying their organizational culture as a specific type of organization of the social economy, recognized as increasingly important economic agents; and in doing so, explore the usage of a widely known model, the Competing Values Framework (Quinn & Rohrbaugh 1983). Three cooperatives were studied. Their presidents were interviewed, and a questionnaire was applied to cooperative members to obtain demographic and organizational culture data. Differences between the cooperatives’ cultural profiles seem to be consistent with both the circumstances of Portuguese social economy organizations (SEOs), and to the organizations’ uniqueness regarding their trade, focuses, and history. International firm trends were compared with this study’s results, and also appear to be explained by the SEO’s management practices evolution standpoint: lack of structured way of working, and the need to improvise and innovate in order to get things done. The importance of our research is held in the fact that social economy, and the cooperative movement in particular, has a developing importance in the expansion of many economies, the lack of literature on culture in SEOs, and the exploratory usage of a well-known model of management literature in cooperatives.

Activity of Tri-N-Butyl Tin maleate in carpets against Staphylococcus aureus and Aspergillus niger, verified through two methodologies: Inhibition Halo (HZ) and Inhibition Surface (Print)

The aim of the present study was to verify the activity of the Tri-N-Butyl Tin maleate compound against Staphylococcus aureus and Aspergillus niger, after its industrial application in 40 samples of carpets of different materials (polypropylene, polyester, polyamide and wool). The qualitative assays were performed through two methodologies: Inhibition Halo (HZ) and Inhibition of Surface (Print). The carpet with the product inhibited 100% of bacterial (Staphylococcus aureus) and fungi (Aspergillus niger) growth, under the conditions of this study. The microbial inhibition was higher in upper portion of carpets. The methodologies employed appear to be adequate to test the bactericide and fungicide activities of the Tri-N-Butyl Tin maleate. The print methodology confirmed the results obtained by the inhibition zone assay. Further studies using the same methodologies are needed to confirm our results.

Organizational culture in cooperatives: an exploratory approach

In recent years, organizational culture has become one of the common themes of interest of scientific and academic research. Each organization has its own unique cultural identity. Based on the recognition that organizational culture is considered important to an organization’s results, and social economy organizations are concerned with improving managerial practices and results, our objective is to study organizational culture in cooperatives: identifying their organizational culture as a specific type of organization of the social economy, recognized as increasingly important economic agents; and in doing so, explore the usage of a widely known model, the Competing Values Framework (Quinn & Rohrbaugh 1983). Three cooperatives were studied. Their presidents were interviewed, and a questionnaire was applied to cooperative members to obtain demographic and organizational culture data. Differences between the cooperatives’ cultural profiles seem to be consistent with both the circumstances of Portuguese social economy organizations (SEOs), and to the organizations’ uniqueness regarding their trade, focuses, and history. International firm trends were compared with this study’s results, and also appear to be explained by the SEO’s management practices evolution standpoint: lack of structured way of working, and the need to improvise and innovate in order to get things done. The importance of our research is held in the fact that social economy, and the cooperative movement in particular, has a developing importance in the expansion of many economies, the lack of literature on culture in SEOs, and the exploratory usage of a well-known model of management literature in cooperatives.

P2P service exposer

Dissertação para obtenção do Grau de Mestre em Engenharia Electrotécnica e de Computadores

Forty years of visceral leishmaniasis in the State of Piaui: a review

Visceral leishmaniasis (VL) has been known to occur in the state of Piauí since 1934. The typically rural disease began to appear in urban areas over time, being concentrated mainly in Teresina, the capital of Piauí. Teresina was also affected by the first urban epidemic of VL in Brazil. Over 1,000 cases of the disease were reported during urbanization (1981-1986). Human population growth and migration led to land occupation on the outskirts of Teresina. These factors have contributed to vector proliferation, increasing the incidence of VL. At present, the incidence of human and canine disease is quite high and uncontrolled in Piauí. It seems that some measures, such as the elimination of seropositive dogs, failed to significantly reduce the number of new VL cases in Teresina. Despite previously conducted studies, little is known about VL epidemiology in urban areas. The aim of this review is to reveal the situation of VL in Teresina during the last 40 years, focusing on the major factors that may contribute to the high incidence and persistence of VL infection.

Cirurgia Obliterativa do Prolapso dos Órgãos Pélvicos - uma Opção ainda Válida?

Objective: To investigate the results of vaginal obliterate surgery in elderly women with pelvic organ prolapse. Design: observational retrospective study. Material and Methods: a total of 69 women with the diagnosis of pelvic prolapse were submitted to obliterative surgery in the urogynecology unit of a tertiary care hospital centre over the course of 8 years (2001 to 2008). The following data were collected from their clinical records: age, number of vaginal births, body mass index (BMI), hormone therapy, other existing diseases, type of prolapse and stage, anaesthetic risk score, duration of surgery, length of hospital stay, and short-term complications. Results: Of the 69 women studied, 31 were submitted to colpocleisis and the remaining 38 were managed by the LeFort technique. Mean age was 74.8 years with a standard deviation (sd) of 7.14 years. Average BMI was 26.2 (sd =3.76). Vaginal births were recorded in all patients. Only three patients were taking hormone therapy at the time of surgery. Sixty-three women were classified as having and anesthetic risk of II or III and 55 underwent local-regional anesthesia. Complications were reported in five cases, four of which in the first days after surgery. Nearly all were mild and resolved within the first 6 weeks. Conclusion: Complication rates appear to be low after obliterative surgery for pelvic organ prolapse in elderly women.

Anal squamous carcinoma: a new AIDS-defining cancer? Case report and literature review

Squamous anal cell carcinoma is a rare malignancy that represents the 1.5% to 2% of all the lower digestive tract cancers. However, an increased incidence of invasive anal carcinoma is observed in HIV-seropositive population since the widespread of highly active antiretroviral therapy. Human papillomavirus is strongly associated with the pathogenesis of anal cancer. Anal intercourse and a high number of sexual partners appear to be risk factors to develop anal cancer in both sexes. Anal pain, bleeding and a palpable lesion in the anal canal are the most common clinical features. Endo-anal ultrasound is the best diagnosis method to evaluate the tumor size, the tumor extension and the infiltration of the sphincter muscle complex. Chemoradiotherapy plus antiretroviral therapy are the recommended treatments for all stages of localized squamous cell carcinoma of the anal canal in HIV-seropositive patients because of its high rate of cure. Here we present an HIV patient who developed a carcinoma of the anal canal after a long time of HIV infection under highly active antiretroviral therapy with a good virological and immunological response.

Envenoming by coral snakes (Micrurus) in Argentina, during the period between 1979-2003

Envenomation by coral snakes (Micrurus sp.) is one of the most dangerous injuries in America and it is considered as a serious medical emergency, however bites by these snakes appear to be rare. We analyzed epidemiological data, clinical signs and antivenom use in Argentina during the period between 1979-2003. During this period of study 46 non-fatal Micrurus bites were reported. The majority of cases were men from 31 to 40 years old. Bites occurred primarily in spring and summer. Most cases were reported from the northeast and northwest provinces of the country. The bites were mostly located on hands or feet and occurred mostly during agricultural activities and so mainly involved farmers. Only four cases occurred as a result of handling snakes. The median time it took for antivenom to be administrated was 60 minutes after the bite, and the median number of vials applied was 2. Local pain was mentioned and edema was reported in 41% of patients. All patients recovered without sequelae. This study showed a low incidence of Micrurus bites and low severity of envenomation. However, although no deaths have been reported during the last 30 years, given the toxicity of the venom of Micrurus snakes, the risk of severe envenomation should be considered.

The development and implementation of math projects in a HEI: expectations, objectives, experiences and analysis

An overwhelming problem in Math Curriculums in Higher Education Institutions (HEI), we are daily facing in the last decade, is the substantial differences in Math background of our students. When you try to transmit, engage and teach subjects/contents that your “audience” is unable to respond to and/or even understand what we are trying to convey, it is somehow frustrating. In this sense, the Math projects and other didactic strategies, developed through Learning Management System Moodle, which include an array of activities that combine higher order thinking skills with math subjects and technology, for students of HE, appear as remedial but important, proactive and innovative measures in order to face and try to overcome these considerable problems. In this paper we will present some of these strategies, developed in some organic units of the Polytechnic Institute of Porto (IPP). But, how “fruitful” are the endless number of hours teachers spent in developing and implementing these platforms? Do students react to them as we would expect? Do they embrace this opportunity to overcome their difficulties? How do they use/interact individually with LMS platforms? Can this environment that provides the teacher with many interesting tools to improve the teaching – learning process, encourages students to reinforce their abilities and knowledge? In what way do they use each available material – videos, interactive tasks, texts, among others? What is the best way to assess student’s performance in these online learning environments? Learning Analytics tools provides us a huge amount of data, but how can we extract “good” and helpful information from them? These and many other questions still remain unanswered but we look forward to get some help in, at least, “get some drafts” for them because we feel that this “learning analysis”, that tackles the path from the objectives to the actual results, is perhaps the only way we have to move forward in the “best” learning and teaching direction.

O contrato psicológico na expatriação

Nos últimos anos, o número de expatriados tem apresentado uma tendência de crescimento a nível mundial. Desta forma, a gestão de expatriados, que integra o subsistema da gestão internacional de recursos humanos, passa a ter uma atenção renovada e tem vindo a crescer enquanto área de intervenção de gestão de recursos humanos. Por sua vez, o contrato psicológico tem sido visto, cada vez mais, como um fator relevante na explicação das relações laborais e o número de estudos em torno desta temática tem aumentado. O sucesso da expatriação é diretamente influenciado pelo contrato psicológico e depende, em grande parte, da forma como são desenvolvidas as práticas de GRH (Homem & Tolfo, 2008). Desta forma, é essencial compreender a reação dos trabalhadores perante a mudança (Bligh & Carsten, 2005; Shield, Thorpe, & Nelson, 2002), uma vez que o comportamento de resposta aos mesmos pode ser um contributo para marcar a diferença decisiva entre o sucesso ou o fracasso da missão internacional. Neste mesmo contexto, assiste-se a uma crescente atenção sobre o contributo que o Contrato Psicológico pode ter em contextos de incerteza. O individuo, enquanto trabalhador de uma organização que decide aceitar uma missão internacional e ir viver para outro país, tem necessidade de se enquadrar num relacionamento contínuo e motivador com a entidade empregadora. A noção do contrato psicológico torna-se fundamental para o entendimento das relações de trabalho, a partir das perceções das pessoas envolvidas. Muitos dos aspetos destes relacionamentos são implícitos (não escritos) o que pode provocar diferentes interpretações sobre as expectativas, promessas e obrigações entre partes. Vários autores defendem que o contrato psicológico é um meio fundamental na compreensão e gestão das atitudes e comportamentos dos indivíduos nas organizações (Bunderson, 2001; Kraimer, Wayne, Liden, & Sparrow, 2005; Lemire & Rouillard, 2005). O objetivo deste trabalho é conhecer o estado do contrato psicológico nos expatriados: antes da missão, após a fase de adaptação ao país de destino e na repatriação. Foi utilizada a metodologia qualitativa e para tal, foi aplicada uma entrevista individual semiestruturada e um questionário sociográfico às pessoas que se encontravam, à data, expatriadas. No total foram realizadas dez entrevistas e a análise das entrevistas foi efetuada através da Grounded Theory. Os resultados sugerem que há apenas cumprimento do contrato psicológico na fase da preparação da missão internacional, havendo, por outro lado, incumprimento do contrato psicológico durante a expatriação e na repatriação, de acordo com a perceção que os expatriados têm acerca do fim da expatriação. No entanto, a maioria dos expatriados entrevistados avalia positivamente a experiência da expatriação, apesar de as organizações parecerem ter apenas algumas regras estabelecidas de suporte ao expatriado, nomeadamente suporte logístico e financeiro, e não disporem de um programa completo e aprofundado de suporte à gestão da expatriação. Os resultados sugerem ainda que é essencial que as organizações estimulem a comunicação com os expatriados e fomentem o suporte que deve ser constante e intrínseco a todas as fases da expatriação, a fim de evitar a sensação de “abandono”.

Bridging present and future of brain-computer interfaces: an assessment of impacts

Based on the report for the “Project III” unit of the PhD programme on Technology Assessment under the supervision of Prof. António B. Moniz. This report was discussed also at the 2nd Winter School on Technology Assessment held at Universidade Nova de Lisboa, Caparica Campus, Portugal on December 2011.