Testosterone levels in dominant sociable males are lower than in solitary roamers: Physiological differences between three male reproductive tactics in a sociably flexible mammal

The relative plasticity hypothesis predicts that alternative tactics are associated with changes in steroid hormone levels. In species with alternative male reproductive tactics, the highest androgen levels have usually been reported in dominant males. However, in sociable species, dominant males show amicable behaviors to gain access to females, which might conflict with high testosterone levels. We compared testosterone, corticosterone, and resting metabolic rate in male striped mice (Rhabdomys pumilio) following a conditional strategy with three different reproductive tactics: (i) philopatric group-living males, (ii) solitary-living roamers, (iii) dominant but sociable group-living territorial breeders. Philopatrics had the lowest testosterone but highest corticosterone levels, suggesting that they make the best of a bad job. Dominant territorial breeders had lower testosterone levels than roamers, which have a lower competitive status. Roamers had the highest testosterone levels, which might promote risky behavior, such as invading territories defended by territorial males. Roamers also had lower resting metabolic rates than either type of group-living males. Our results suggest that dominant males' testosterone levels reflect a trade-off between low testosterone amicable behavior and high testosterone dominance behavior.

Alternative reproductive tactics in male Cape ground squirrels Xerus inauris

In some animal societies, males vary in the strategies and tactics that they use for reproduction. Explanations for the evolution of alternative tactics have usually focussed on extrinsic factors such as social status, the environment or population density and have rarely examined proximate differences between individuals. Anecdotal evidence suggests that two alternative reproductive tactics occur in cooperatively breeding male Cape ground squirrels. Here we show that there is strong empirical support for physiological and behavioural differences to uphold this claim. `Dispersed' males have higher resting metabolic rates and a heightened pituitary activity, compared with philopatric 'natal' males that have higher circulating cortisol levels. Dispersed males also spend more time moving and less time feeding than natal males. Additionally, lone males spend a greater proportion of their time vigilant and less of their time foraging than those that were in groups. The choice of whether to stay natal or become a disperser may depend on a number of factors such as age, natal group kin structure and reproductive suppression, and the likelihood of successful reproduction whilst remaining natal. Measuring proximate factors, such as behavioural and endocrine function, may provide valuable insights into mechanisms that underlie the evolution of alternative reproductive tactics.

Werner Büttner and the Melodic Tactics of Subversive Affirmation: an Introduction

An introduction to the work and practice of Werner Büttner included in Werner Büttner: Coincidence in Splendour, a retrospective monograph on the artist's painting practice from the late 1970s to present. In this shorter text, Slyce contextualises Büttner's practice amongst his contemporary German painters with which he worked and operated alongside.

Territories of scarcity and creativity: a critical view of informal settlements and emerging tactics under conditions of scarcity in Nairobi, Kenya and Quito, Ecuador

This thesis explores the processes through which scarcity is constructed in informal settlements and how conditions emerging within its limits gives way to particular socio-spatial phenomena and influence the emergence of self-organisation and creative strategies from a non-expert perspective. At the same time, this thesis deconstructs these emerging tactics (reactive and transformative) in a diagrammatic way to generate a critical study of their potential for socio-spatial change that goes beyond the everyday survival. Most people associate scarcity with “not having enough” of something, most usually of a material nature. In contrast, this paper is based on the premise that scarcity is a constructed condition, therefore exploring it beyond its immediate manifestation and illustrating its discursive, distributive and socio-material components. In this line, the research uses Assemblage Theory as both an approach and a tool for analysis. This approach allows the research to depart from everyday narratives of the residents, and gradually evolve into a multi-scalar, non-linear reading of scarcity, by following leads into different realms and unpacking a series of routine events to uncover their connections to wider processes and particular elements affecting the settlement and the city as a whole. For this purpose, the research is based on a qualitative, flexible and multi-sited methodology, using different case studies as testing grounds. Collected data stems from a 11-months ethnographic fieldwork in informal settlements in Ecuador and Kenya, analysing the socio-spatial practices and strategies deployed by the different actors producing the built environment and arising from everyday and latent experiences of scarcity. The thesis examines the multi-scalar nature of these strategies, including self-building and management tactics, the mobilisation of grassroots organisations, the innovative ways of collaborating deployed by different coalitions and the reformulation of urban development policies. As outcomes of the research, the thesis will show illustrative diagrams that allow a better understanding of, firstly, the construction of scarcity in the built environment beyond its immediate manifestation and secondly, the way that emerging tactics a) improve existing conditions of scarcity, b) reinforce the status quo or c) contribute to the worsening of the original condition. Therefore, this thesis aims to offer lessons with both practical and theoretical considerations, by firstly, giving an insight into the complexity and transcalar nature of the construction of scarcity in informal settlements; secondly, by illustrating how acute conditions related to scarcity gives birth to a plethora of particular phenomena shaping the territory, social relationships and processes; and thirdly, by identifying specific characteristics within the informal that might allow for new readings of the city and possibilities for socio-spatial change under conditions of scarcity.

Aplicação de um ciclo orgânico de Rankine à indústria Naval

Trabalho Final de Mestrado para obtenção de grau de Mestre em Engenharia Mecânica

Estudo do escoamento dos produtos da combustão no interior de uma conduta de evacuação de turbinas a gás utilizadas para propulsão naval

Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do grau de Mestre em Engenharia Mecânica

Fatigue life assessment of exhaust systems for naval gas turbines

Dissertação para obtenção do Grau de Mestre em Engenharia Mecânica

Análise de um sistema de evacuação de produtos da combustão de turbinas a gás utilizadas para propulsão naval

De modo a eliminar a propagação de fissuras ocorridas em condutas de evacuação de produtos da combustão de turbinas a gás utilizadas para propulsão naval, neste estudo é feita a avaliação de diferentes geometrias alternativas para a estrutura mencionada, assim como se avalia a possibilidade de substituição local, nas zonas críticas, do material actualmente utilizado na conduta por uma nova liga de alta resistência. A possibilidade de utilizar um novo aço inoxidável austenítico Cr-Mn, de alta resistência (ThyssenKrupp, 2009), está a ser estudada e alguns resultados experimentais efectuados a este material, obtidos a temperatura ambiente e a alta temperatura, são apresentados. Este trabalho pode ser dividido em duas partes principais. Uma primeira parte onde se apresenta a análise experimental realizada e uma segunda parte, que trata a simulação numérica da conduta por elementos finitos. Na análise experimental foram realizados ensaios de tracção uniaxial, ensaios de dureza e de caracterização geométrica do cordão de soldadura de ligações soldadas de tipo topo a topo entre o aço AISI 316L e o aço Cr-Mn. Alguns dos resultados experimentais obtidos em provetes soldados com combinações dos materiais de base, aço AISI316L e Cr-Mn, a 24ºC e 350ºC, são: a tensão de cedência do aço Cr-Mn é cerca de 66% e 35% mais elevada que a obtida para o aço AISI 316L, a 24 e 350ºC, respectivamente; a tensão de rotura é também 33% e 19% mais elevada que o aço AISI 316L, para as mesmas temperaturas. Os ensaios de dureza revelam valores médios que estão de acordo com as propriedades mecânicas obtidas à temperatura ambiente. Tendo como referência os resultados experimentais obtidos para as propriedades mecânicas dos materiais, assim como a distribuição de temperaturas e de pressão interna devido aos gases resultantes da combustão, foi feita a simulação numérica de diferentes geometrias da conduta, tendo sido determinado o nível das tensões presentes na superfície da conduta. A distribuição de temperatura e pressão introduzidas nas análises numéricas foram calculadas e verificada a sua validade por comparação com os resultados obtidos por (Cruz, 2009). Os resultados das análises numéricas sugerem que a alteração da geometria actual da conduta pode ser benéfica uma vez que as tensões principais máximas induzidas na estrutura podem diminuir mais de 26%, quando comparadas com as tensões termomecânicas induzidas na geometria actual da conduta.

Implementação de um modelo de geometric semantic genetic programming para aplicação naval

Recaí sob a responsabilidade da Marinha Portuguesa a gestão da Zona Económica Exclusiva de Portugal, assegurando a sua segurança da mesma face a atividades criminosas. Para auxiliar a tarefa, é utilizado o sistema Oversee, utilizado para monitorizar a posição de todas as embarcações presentes na área afeta, permitindo a rápida intervenção da Marinha Portuguesa quando e onde necessário. No entanto, o sistema necessita de transmissões periódicas constantes originadas nas embarcações para operar corretamente – casos as transmissões sejam interrompidas, deliberada ou acidentalmente, o sistema deixa de conseguir localizar embarcações, dificultando a intervenção da Marinha. A fim de colmatar esta falha, é proposto adicionar ao sistema Oversee a capacidade de prever as posições futuras de uma embarcação com base no seu trajeto até à cessação das transmissões. Tendo em conta os grandes volumes de dados gerados pelo sistema (históricos de posições), a área de Inteligência Artificial apresenta uma possível solução para este problema. Atendendo às necessidades de resposta rápida do problema abordado, o algoritmo de Geometric Semantic Genetic Programming baseado em referências de Vanneschi et al. apresenta-se como uma possível solução, tendo já produzido bons resultados em problemas semelhantes. O presente trabalho de tese pretende integrar o algoritmo de Geometric Semantic Genetic Programming desenvolvido com o sistema Oversee, a fim de lhe conceder capacidades preditivas. Adicionalmente, será realizado um processo de análise de desempenho a fim de determinar qual a ideal parametrização do algoritmo. Pretende-se com esta tese fornecer à Marinha Portuguesa uma ferramenta capaz de auxiliar o controlo da Zona Económica Exclusiva Portuguesa, permitindo a correta intervenção da Marinha em casos onde o atual sistema não conseguiria determinar a correta posição da embarcação em questão.

L'oyseau de rivière, ou Le tournoy naval. Dédié aux mariniers.

[Mazarinade. 1649]

L'oyseau de rivière, ou Le tournoy naval. Dédié aux mariniers.

[Mazarinade. 1649]

Psychopathy and self-monitoring : additive and interactive effects on self-presentation tactics /

The purpose of this study was to determine the relative contributions of psychopathy and self-monitoring to the prediction of self-presentation tactics (behaviours that individuals use to manipulate their self-image). Psychopathy is composed of two main factors: Factor 1, which includes manipulativeness and shallow affect, and Factor 2, which includes irresponsibility and anti-social behaviours. Self-monitoring is a personality trait that distinguishes between those who adapt their behaviour to fit different social situations (high self-monitors) and those who behave as they feel regardless of social expectations (low selfmonitors). It was hypothesized that self-monitoring would moderate the relationship between psychopathy and self-presentation tactics. One hundred and forty-nine university students completed the Self-Monitoring Scale (Snyder, 1974), the Self-Report Psychopathy Scale - Version III (Paulhus et aI., in press), the Self-Presentation Tactics scale (Lee, S., et aI., 1999), the HEXACO-PI (a measure ofthe six major factors of personality; Lee, K., & Ashton, 2004), and six scenarios that were created as a supplementary measure of the selfpresentation tactics. Results of the hierarchical multiple regression analyses showed that self-monitoring did moderate the relationship between psychopathy and three of the selfpresentation tactics: apologies, disclaimers, and exemplification. Further, significant interactions were observed between Factor 1 and self-monitoring on apologies and the defensive tactics subscale, between Factor 2 and self-monitoring on self-handicapping, and between Factor 1 and Factor 2 on exemplification. Contrary to expectations, the main effect of self-monitoring was significant for the prediction of nine tactics, while psychopathy was significant for the prediction of seven tactics. This indicates that the role of these two personality traits in the explanation of self-presentation tactics tends to be additive in nature rather than interactive. In addition. Factor 2 alone did not account for a significant amount of variance in any of the tactics, while Factor 1 significantly predicted nine tactics. Results are discussed with regard to implications and possible directions for future research.

Naval Occurrences of the Late War Between Great Britain and the United States of America- 1817

Full title is "A Full and Correct Account of the Chief Naval Occurrences of the Late War Between Great Britain and the United States of America; preceded by a Cursory Examination of the American Accounts of their Naval Actions Fought Previous to that Period: to Which is Added an Appendix; with Plates" This is an expanded version of author William James' pamphlet "An Inquiry into the Merits of the Principal Naval Actions between Great Britain and the United States." (Halifax, Nova Scotia, 1816) In this work he discussed how American ships, during the War of 1812, were larger and more heavily armed and manned than those of the British. He therefore, stated that American victories were due only to their greater numerical force and not their superior seamanship. Naval Occurrences is a thorough documentation of the naval operations from the British perspective that addresses contradictions and inconsistencies within the American official documents as well as political and media accounts. This is perhaps his motivation for the words "Corrected Account" within the title. James' sentiments towards the US most likely sprouted from being held prisoner while visiting in 1812. (He was falsely accused of being a renegade seeking revenge on the US.) In 1813, he escaped to Halifax where he began writing on various naval topics. James became one of the leading authorities on British Naval History.