Exact Solutions of the Dirac Equation for Modified Coulombic Potentials

Exact solutions are found to the Dirac equation for a combination of Lorentz scalar and vector Coulombic potentials with additional non-Coulombic parts. An appropriate linear combination of Lorentz scalar and vector non-Coulombic potentials, with the scalar part dominating, can be chosen to give exact analytic Dirac wave functions. The method works for the ground state or for the lowest orbital state with l=j-{1/2}, for any j.Comment: 7 pages, Latex fil

Modelling Financing Schemes for Energy System Planning: A Mini-Grid Case Study

Energy modeling has been playing a crucial role in defining solutions for effective energy planning. Bottomup energy system planning models, namely those models characterized by high technological detail, typically present exogenous techno-economic parameters which rely on data gathered by the user, from specific costs to efficiencies. However, poor to no attention has been given to the date to the financial parameters of energy models, which are often assumed and barely justified (e.g., “discount rate equal to 10%”, full stop). Still, model outputs are drastically sensitive to variations of finance-related parameters and must provide the financing structure that a decision-maker should implement for funding the advised energy planning strategies. This results particularly crucial for mini-grid sizing in sub-Saharan African countries, where the challenge of the energy transition entails the construction of massive new capacities to improve energy access rates and tiers of service, demanding an enhanced collaboration between private and public sectors. The case study, applied on an off-grid mini-grid in Mozambique, proposes a comparison between scenarios with increasing financial detail and a possible conceptualization of the hard link between detailed financial modelling and a bottom-up energy model for mini-grid optimization. Different financing schemes are modelled and their impact on the energy modelling outputs assessed. Project finance hence emerges as a useful approach that could upgrade the financing structure of domestic power projects in African countries. This may lead to many benefits: more sustainable and affordable interest rates where corporate finance is missing, improved risk management, diversified funding mix, and facilitated financial support from international institutions

VIOLÊNCIA E CULTURA DIGITAL: O CYBERBULLYING DE ALUNOS DO ENSINO MÉDIO CONTRA PROFESSORES NO YOUTUBE

Investigou-se, neste artigo, os motivos que conduziram os alunos do Ensino Médio a praticarem cyberbullying contra seus professores. Para tanto, realizou-se um levantamento de vídeos de imagens aviltantes de professores postados no YouTube. A análise se fundamentou nos pressupostos conceituais da Teoria Crítica da Sociedade. Após a seleção de três vídeos registrados em escolas brasileiras, conclui-se que os alunos se sentiram motivados a postar tais vídeos para que pudessem sadicamente humilhar seus professores e ser narcisicamente reconhecidos como produtores de vídeos “virais”, que são constante e maciçamente vistos, comentados e repostados nas redes sociais

Os públicos do Centro Cultural e de Congressos das Caldas da Rainha

Relatório de estágio de mestrado, Cultura e Comunicação, Universidade de Lisboa, Faculdade de Letras, 2013O trabalho que se apresenta compõe o relatório do estágio curricular realizado no Centro Cultural e de Congressos das Caldas da Rainha (CCC), no âmbito do curso de Mestrado em Cultura e Comunicação. Partindo da experiência adquirida ao longo do estágio e através de vários tópicos de análise, o relatório será, grosso modo, uma reflexão sobre o papel de um equipamento cultural como o CCC no estabelecimento de dinâmicas culturais na cidade das Caldas da Rainha, tendo como base fundamental a forma como são geridos os públicos. Não se pretende apenas relatar o desempenho ao longo do estágio e as informações factuais sobre o equipamento cultural ou sobre a região em termos geográficos e sociais, mas também utilizar esse conhecimento para problematizar e responder às questões levantadas. A estruturação do relatório obedeceu aos objetivos traçados previamente. A definição dos conceitos de Políticas Culturais e dos Públicos da Cultura e a contextualização histórico-cultural da cidade das Caldas da Rainha compõem a base conceptual do trabalho, tendo em conta que a parte central será o estudo dos Públicos do CCC.Abstract: This essay is the report of the curricular internship that took place in Centro Cultural e de Congressos das Caldas da Rainha (CCC) within the Master’s program in Culture and Communication. Based on the experience acquired during the internship and through several topics for analysis, the current report engages, grosso modo, in a reflection on the role of CCC’s cultural equipment in the establishment of cultural dynamics in the city of Caldas da Rainha and is essentially based on the way audiences are managed. The intention is not only to report the performance during the internship and the factual information on the cultural equipment or on the region in its geographical and social scope, but also to use that knowledge in order to discuss and answer to the issues raised. The structure of the report follows the objectives previously laid down. The definition of Cultural Policies and Culture Audiences concepts and the historical and cultural context of Caldas da Rainha are the conceptual basis of this work, considering that the main subject is the CCC audience analysis

Antifungal and antibacterial activity of the floral ethanolic extract of Mandevilla pohliana (Stadelm.) A. H. Gentry

Mandevilla pohliana é uma espécie pertencente à família Apocunaceae encontrada em ambientes de Cerrado. Objetivou-se avaliar neste estudo, a ação antifúngica e antibacteriana do extrato etanólico floral de M. pohliana. Flores de M. pohliana foram coletadas e o extrato etanólico produzido por maceração. Em diferentes concentrações de extrato, foram determinadas as atividades antifúngicas sobre o gênero Candida, e antibacterianas sobre Escherichia, Salmonella, Enterococcus, Pseudomonas e Staphylococcus. Foi observada atividade de antibiose apenas para C. guilliermondii com 9-2 mm, para P. aeruginosa com 12-3 mm e para E. faecalis entre 10-3 mm nas maiores concentrações entre 50-500 mg mL-1. O extrato etanólico floral de Mandevilla pohliana demonstrou potencial como agente antifúngico e antibacteriano natural.Mandevilla pohliana is a species belonging to the Apocynaceae family found in Cerrado environments. The bjetive of this study was to evaluate the antifungal and antibacterial action of the floral ethanolic extract of M. pohliana. Flowers of M. pohliana were collected and the ethanolic extract produced by maceration. In different concentrations of extract, antifungal of the genus Candida were determined, and antibacterial activities on Escherichia, Salmonella, Enterococcus, Pseudomonas and Staphylococcus. Antibiosis activity was observed only for C. guilliermondii with 9-2 mm, for P. aeruginosa with 12-3 mm and for E. faecalis between 10-3 mm at the highest concentrations between 50-500 mg mL-1. The floral ethanolic extract of Mandevilla pohliana showed potential as a natural antifungal and antibacterial agent.&nbsp

Record linkage of pharmacovigilance and registration databases: a study of biological medicines in Brazil

Introduction Biologic medicines have revolutionized the treatment of many serious and chronic illnesses and they present important challenges for approval and post-market surveillance of drug safety. Pharmacovigilance is an important strategy for monitoring adverse drug events in the post-market. Drug registration is an essential element of medicine regulation. Objectives and Approach Brazilian Health Regulatory Agency, ANVISA, is responsible for drug registration and surveillance. In this work we describe the process of linkage of databases covering registration, post-approval changes, and pharmacovigilance of biological medicines in Brazil. 2.429,556 registration dossiers included in the comprehensive national drug registration database, DATAVISA, and 93,391 reports of adverse drug events in the pharmacovigilance database, NOTIVISA, were analyzed for completeness and non biologic dossiers were filtered out. Deterministic linkage technique was used to connect DATAVISA and NOTIVISA data. Results Of the DATAVISA dossiers, 188,830 were registrations and 2,240,726 records were post-approval changes. After filtering out the non-biologic dossiers, 48,144 post-approval changes dossiers for biologic drugs were obtained. Aggregation of 48,144 post-approval biologic products dossiers resulted in 663 product-manufacturer pairs. For pharmacovigilance data, aggregation produced 5,874 pairs. Registration and post-approval changes merging from aggregated pairs resulted in 577 pairs. Trios with pharmacovigilance data resulted in 147 matches. These 147 pairs respond for 5.468 identified adverse drug events reports. Adverse drug events reports of biological medicines account for around 5,0 \% of NOTIVISA. Conclusion/Implications Regulatory actions should be implemented to stimulate adverse events reports of biological products. A single database with registration, post-approval changes and pharmacovigilance data was produced. Data linkage permitted analysis of biological medicines in the post-market and can provide important information to evaluate risk in drug development

Cardiovascular responses to passive static flexibility exercises are influenced by the stretched muscle mass and the Valsalva maneuver

BACKGROUND: The respiratory pattern is often modified or even blocked during flexibility exercises, but little is known about the cardiovascular response to concomitant stretching and the Valsalva maneuver (VM) in healthy subjects. OBJECTIVES: This study evaluated the heart rate (HR), systolic blood pressure (SBP), and rate-pressure product (RPP) during and after large and small muscle group flexibility exercises performed simultaneously with the VM. METHODS: Asymptomatic volunteers (N = 22) with the following characteristics were recruited: age, 22 ± 3 years; weight, 73 ± 6 kg; height, 175 ± 5 cm; HR at rest, 66 ± 9 BPM; and SBP at rest, 113 ± 10 mmHg. They performed two exercises: four sets of passive static stretching for 30 s of the dorsi-flexion (DF) of the gastrocnemius and the hip flexion (HF) of the ischio-tibialis. The exercises were performed with (V+) or without (V-) the VM in a counterbalanced order. The SBP and HR were measured, and the RPP was calculated before the exercise session, at the end of each set, and during a 30-min post-exercise recovery period. RESULTS: The within-group comparisons showed that only the SBP and RPP increased throughout the sets (p<0.05), but no post-exercise hypotension was detected. The between-group comparisons showed that greater SBP increases were related to the VM and to a larger stretched muscle mass. Differences for a given set were identified for the HR (the HFV+ and HFV- values were higher than the DFV+ and DFV- values by approximately 12 BPM), SBP (the HFV+ value was higher than the DFV+ and DFV- values by approximately 12 to 15 mmHg), and RPP (the HFV+ value was higher than the HFV- value by approximately 2000 mmHGxBPM, and the HFV+ value was higher than the DFV+ and DFV- values by approximately 4000 mmHGxBPM). CONCLUSION: Both the stretched muscle mass and the VM influence acute cardiovascular responses to multiple-set passive stretching exercise sessions

Fire behaviour in different periods and configurations of a landscape in Northeastern Portugal

Neste trabalho aborda-se a importância do planejamento do uso e ocupação do solo, e do manejo dos sistemas florestais na redução do perigo de incêndio, analisando-se o comportamento do fogo em relação às alterações na paisagem da Deilão, nordeste de Portugal. Foram utilizadas cadeias de Markov e modelos de autômatos celulares como metodologia para projetar a paisagem no futuro. FlamMap foi utilizado para simular o comportamento do fogo. De acordo com as métricas da paisagem obtidas no Fragstats, observou- se que os cenários e projeções em Deilão têm uma tendência à simplificação da paisagem, o que pode facilitar a ocorrência de incêndios maiores e mais graves. A análise dos resultados indicou uma tendência ao aumento do perigo de incêndios na região, em grande parte, ocasionado pela expansão de plantações contínuas de florestas. Para evitar tais impactos, o manejo florestal e ordenamento da paisagem devem ser modificados a fim de se reduzir o acúmulo de materiais combustíveis.In this study, we discuss the importance of land use, land cover planning and forest stand management in fire hazard reduction, through the analysis of fire behavior in relation to landscape changes in Deilão, northeastern Portugal. Markov chains and cellular automata model were used to project future landscapes whose structures were quantified by landscape metrics. The FlamMap model was used to simulate fire behavior. According to landscape metrics from Fragstats, we observed that scenarios and projections in Deilão have a trend towards landscape simplification, which may facilitate the occurrence of larger, more severe fires. The analyses indicate an increased fire hazard trend in the region, largely caused by the continuity of forest cover. To avoid such impacts, forest management and landscape plannig should be modified in order to reduce the accumulation of combustible materials.info:eu-repo/semantics/publishedVersio

Influência de reguladores de crescimento no desenvolvimento radicular de sementes de Coffea arabica L. Rubi in vitro

It was evaluated the effect of plant growth regulators in the root development in coffee seeds cv. Rubi (Coffea arabica L. Rubi) grown in vitro. Coffee seeds from adult plants were established on medium MS/2 + sucrose (20 g L-1) + agar (6 g L-1). Four treatments were tested: T1 - control; T2 -BAP (6 mg L-1) + NAA (0,1 mg L-1); T3 -BAP (6 mg L-1); T4 - GA3 (5 mg L-1). The highest rooting response was observed on the control (MS/2 + agar + sucrose). This suggest that rooting can be achieved without the use of plant growth regulators.Avaliou-se o efeito de reguladores de crescimento na germinação e enraizamento in vitro de sementes de cafeeiro Rubi (Coffea arabica L. Rubi ). Sementes de plantas adultas de cafeeiro foram inoculadas em meio MS/2 + 20 g L-1 de sacarose e 6 g L-1 de ágar. Foram testados quatro tratamentos: T1 - controle; T2 - 6 mg L-1 de BAP + 0,1 mg L-1 de ANA; T3- 6 mg L-1 de BAP; T4 - 5 mg L-1 de GA3. O melhor tratamento obtido para enraizamento de sementes de cafeeiro foi o controle (MS/2 + ágar + sacarose), tornando-se desnecessária a adição de reguladores de crescimento

CARACTERÍSTICAS, OPERACIONALIDADE E PRODUÇÃO DA FROTA SERREIRA NO MUNICÍPIO DA RAPOSA - MA

Este trabalho aborda as características, operacionalidade e produção pesqueira da frota serreira, no município da Raposa, no período de março a dezembro de 2003, com desembarques nos portos da Praia da Raposa e Braga. Os dados utilizados são provenientes da Capitania dos Portos do Maranhão, Programa Revizee (Recursos Vivos da Zona Econômica exclusiva) e da comunidade de pescadores do município. Os barcos foram agrupados em duas categorias: pequenos - com comprimento total máximo em torno de 10m; grandes - com comprimento total superior a 10m. Barcos pequenos e grandes operam com autonomia de até 15 dias de mar/mês. Esta frota está composta por 354 embarcações. Definiram-se em função do tamanho, forma e modo de operação 5 tipos de embarcações da frota que são: 1 - biana aberta; 2 - biana fechada; 3 - bote; 4 - casco; 5 - barcos de fibra. Os últimos controles de desembarques no município efetuados nos anos de 1999 e 2000, registraram uma produção média da frota de 9.718,51 ton/ano e 6.549,9 ton/ano, respectivamente.   Abstract   CHARACTERISTICS, OPERACIONALITY AND FISHING PRODUCTION OF THE SERRA FISHING FLEET, AT THE CITY OF RAPOSA - MA.   This work deals with characteristics, operacionality and fishing production of the spanish mackerel fishing fleet, at the city of Raposa, between September and December 2003. The data are from the ports command of Maranhão, of the Revizee program and of the local fisherman community. The boats were grouped into two categories: small - with maximum total lenght about 32,89 feet; big - with maximum lenght above 32,89 feet. Both boats categories show autonomy of up to 15 days at sea  per month. This fleet is composed by 354 vessels. These vessels were defined as: 1 - opened biana; 2 - closed biana; 3 - boat; 4 - ´casco´; 5 - fiber boat. The fleet mean prodution was 9.718 tons/year and 6.549 tons/year relating to 1999 and 2000, respectively.   Keywords: mackerel fishing boats,characteristics, operacionality, fishing production, Raposa