The Tenure Game: Building Up Academic Habits

Why do some academics continue to be productive after receiving tenure? This paper answers this question by using a Stackelberg differential game between departments and scholars. We show that departments can set tenure rules and standards as incentives for scholars to accumulate academic habits. As a result, academic habits have a lasting positive impact in scholar’s productivity, leading to higher scholar’s productivity rate of growth and higher productivity level.Role of economists; sociology of economics.

Luzes e sombras na operação militar da tomada de Ceuta, em 1415

Analise das luzes e sombras da tomada de Ceuta em 1415: as razões de diversa ordem que levaram a esta expedição, a preparação da campanha, as operações militares de tomada da cidade, o balanço da conquista da primeira praça portuguesa no Norte de Afric

Human Development, Economic Policy and Income Inequality in Cabo Verde

By most accounts, Cabo Verde is making tremendous achievements economically, politically, and socially. Forty years after becoming independent, it finds itself consistently among the highest performers on human development scales anywhere in Africa. This paper is a reflection on Cabo Verde’s development and economic growth as it relates to questions of income and resource distribution. Specifically, it considers the challenge of inequality in the distribution of income and the possibility that present inequality trends may be related to economic policy-making over that last twenty-five years. It draws on government reports and United Nations and World Bank documents to capture the trajectory of inequality in this time period, and on recent ethnographic studies to substantiate its manifestations through different segments of the social system

Massive MIMO Full-Duplex Relaying with Optimal Power Allocation for Independent Multipairs

With the help of an in-band full-duplex relay station, it is possible to simultaneously transmit and receive signals from multiple users. The performance of such system can be greatly increased when the relay station is equipped with a large number of antennas on both transmitter and receiver sides. In this paper, we exploit the use of massive arrays to effectively suppress the loopback interference (LI) of a decode-and-forward relay (DF) and evaluate the performance of the end-to-end (e2e) transmission. This paper assumes imperfect channel state information is available at the relay and designs a minimum mean-square error (MMSE) filter to mitigate the interference. Subsequently, we adopt zero-forcing (ZF) filters for both detection and beamforming. The performance of such system is evaluated in terms of bit error rate (BER) at both relay and destinations, and an optimal choice for the transmission power at the relay is shown. We then propose a complexity efficient optimal power allocation (OPA) algorithm that, using the channel statistics, computes the minimum power that satisfies the rate constraints of each pair. The results obtained via simulation show that when both MMSE filtering and OPA method are used, better values for the energy efficiency are attained.Comment: Accepted to the 16th IEEE International Workshop on Signal Processing Advances in Wireless Communications - SPAWC, Stockholm, Sweden 201

"Jaime" de António Reis : o inesperado no cinema português

O projecto “Principais tendências no cinema português contemporâneo” nasceu no Departamento de Cinema da ESTC, com o objectivo de desenvolver investigação especializada a partir de um núcleo formado por alunos da Licenciatura em Cinema e do Mestrado em Desenvolvimento de Projecto Cinematográfico, a que se juntaram professores-investigadores membros do CIAC e convidados. O que agora se divulga corresponde a dois anos e meio de trabalho desenvolvido pela equipa de investigação, entre Abril de 2009 e Novembro de 2011. Dada a forma que ele foi adquirindo, preferimos renomeá-lo, para efeitos de divulgação, “Novas & velhas tendências no cinema português contemporâneo”.QUAIS SÃO, hoje, as principais características do desenvolvimento de projectos para cinema em Portugal? O que pensam realizadores cinematográficos, produtores, distribuidores e exibidores sobre o cinema português? Que conclusões tirar das suas opiniões, relatos de experiências e análises da situação contemporânea? Que novas tendências surgiram no cinema português, nos primeiros anos do séc. XXI?Fundação para a Ciência e Tecnologia, Centro de Investigação em Artes e Comunicação, Instituto do Cinema e do Audiovisual, Ministério da Cultura, Escola Superior de Teatro e Cinema

Contrôle biologique de la pourriture cendrée (Macrophomina phaseolina) du niébé par l’enrobage des semences avec Clonostachys rosea: Impact des conditions de conservation des semences traitées sur la performance du bioagent.

Dans les sols infestés avec Macrophomina phaseolina les semences de niébé ne germent pas ou bien la plantule est détruite plus ou moins rapidement après la germination. Clonostachys rosea est un champignon commun du sol reconnu comme un saprophyte avec une haute capacité de compétition sur les racines et dans le sol. Notre étude a pour objectif d’évaluer l’effet de C. rosea en traitement de semences du niébé conservées à 40°C sur le développement de la pourriture charbonneuse. L’effet de la durée de conservation sur la viabilité des spores et le pouvoir antagonique du bioagent a également été étudié dans les conditions semi contrôlé et au champ. Les isolats de C. rosea proviennent de la collection du laboratoire de phytopathologie de AGRHYMET. La production des spores a été effectuée sur le milieu PDA pendant 4 semaines. Les semences du niébé ont été traitées avec une suspension de spores à la concentration de 108 spores / ml à raison de 5 ml de suspension par kg de semences. Les semences traitées ont été séchées sous la hotte à flux laminaire pendant 2 h avant d’être semées ou conservées à 40°C. Des tests de viabilité des spores de C. rosea sur le milieu de culture PDA ont été effectués au laboratoire tous les 15 jours de conservation. Le taux de germination des semences sur papier buvard, évalué au cinquième jour après semis au laboratoire a été de 99 %. La forte moyenne de spores viables au jour de l’enrobage (J0) (>4,5 105), a chuté à 1700 spores par graines après 75 jours de conservation. En serre, le niveau de colonisation des tissus des plants de niébé se développant sur le sol infesté a été significativement plus faible chez les plants issus de graines enrobées (1009 microsclérotes/g tissus) que chez ceux issus de graines non enrobées (2356 microsclérotes/g tissus). Par rapport a la sévérité de la maladie, exprimée sur une échelle de 1-5, ont été notées une forte infection des plants du témoin Macrophomina (graines non traitées semées dans un sol infesté) et des attaques moins sévères sur les traitements G3M et G4M (graines traitées semées dans un sol infesté). Au champ dans l’essai semé avec des graines enrobées mais non conservées, l’association des isolats G3 et G4 a été nettement supérieure aux autres traitements par rapport aux rendements en fane et en graines. Par contre, par rapport au rendement, aucun effet des traitements n’a été observé dans l’essai semé avec les graines conservées pendant 30 jours

Localization studies of the FemXAB protein family in Staphylococcus aureus

Dissertação apresentada para a obtenção do Grau de Mestre em Genética Molecular e Biomedicina, pela Universidade Nova de Lisboa, Faculdade de Ciências e TecnologiaThe public health burden of methicillin-resistant Staphylococcus aureus (MRSA) strains and the emergence of vancomycin resistance in S. aureus call for alternative strategies in chemotherapy. The FemXAB family of proteins is responsible for the assembly of the characteristic pentaglycine cross-bridge in the peptidoglycan of S. aureus, which is essential both for cell viability and for the expression of high level methicillin resistance. Fem proteins are, therefore, good candidate targets for the development of pathogen specific antimicrobial compounds, acting alone or synergistically with -lactams. In this work, we characterized the localization of the FemX, FemA and FemB proteins (which add the 1st; 2nd and 3rd; 4th and 5th glycines of the crossbridge, respectively) during the bacterial cell cycle, using fluorescence microscopy. These proteins localized preferably at the membrane, including the septum, and de-localized in the absence of the peptidoglycan precursor. FemA and FemB proteins colocalized in all cells observed during the different stages of the cell cycle, whilst FemX and FemA proteins co-localized in 64% of the cells. To determine if the FemB protein was dependent on FemA for proper localization, different approaches were used to attempt inactivation of the femA gene, but all were unsuccessful, suggesting that femA may be a lethaltarget

A Growth Model for the Quadruple Helix Innovation Theory

We propose a theoretical growth model with which to frame analytically the Quadruple Helix Innovation Theory (QHIT). The aim is to emphasise the investment in innovation transmission mechanisms in terms of economic growth and productivity gains, in one-high-technology sector, by stressing the role played by the helices of the Quadruple Helix Innovation Model: Academiaand Technological Infrastructures, Firms of Innovation, Government and Civil Society. In the existing literature, the relationship between the helices and respective impacts on economic growth does not appear clear. Results are fragiledue to data weakness and the inexistence of a theoretical framework to specify the relationship between the helices. Hence our motivation for providing the QHIT with a theoretical growth model. Our intent is to model the importance of emerging, dynamically adaptive, and transdisciplinary knowledge and innovation ecosystems to economic growth. We .nd that higher economic growth rate is obtained as a result of an increase in synergies and complementarities between different productive units, or an incease in productive government expenditure.Economic Growth; Quadruple Helix Innovation Model; Innovation Ecosystems.

Weed management in vineyards, olive groves and orchards

A implementação de culturas perenes, em Portugal, sofreu nas últimas décadas grandes alterações quer na instalação da cultura quer nas técnicas de gestão. Este artigo revê a gestão das infestantes nas principais culturas perenes em Portugal, o que se julga pertinente dado que se tem verificado a implementação de sistemas de modo de produção biológica (MPB) e de produção integrada (MProdi). Por infestante, os autores, consideram as populações de uma dada espécie vegetal que acima de determinados níveis e sob condicionalismos ecológicos particulares sejam responsáveis por prejuízos “líquidos” (balanço benefícios-prejuízos negativo) inaceitáveis em termos económicos e/ou ecológicos ou sociais. Primeiramente, apresentam-se os dados de 2015 relativamente às áreas e produções das culturas perenes mais importantes em Portugal – vinha, olival, pomares de macieira, pereira e citrinos. De seguida, referem-se os principais prejuízos e benefícios das infestantes, salientando-se os estudos relativos aos prejuízos na vinha e os meios de controlo disponíveis mais adotados–mobilização do solo, controlo químico e enrelvamento, as vantagens e inconvenientes de cada método. Por último, refere-se a conveniência da integração das técnicas de gestão, de modo a potenciar os benefícios de cada uma e evitar as suas limitaçõesinfo:eu-repo/semantics/publishedVersio