Stochastic and deterministic processes interact in the assembly of desert microbial communities on a global scale

Extreme arid regions in the worlds' major deserts are typified by quartz pavement terrain. Cryptic hypolithic communities colonize the ventral surface of quartz rocks and this habitat is characterized by a relative lack of environmental and trophic complexity. Combined with readily identifiable major environmental stressors this provides a tractable model system for determining the relative role of stochastic and deterministic drivers in community assembly. Through analyzing an original, worldwide data set of 16S rRNA-gene defined bacterial communities from the most extreme deserts on the Earth, we show that functional assemblages within the communities were subject to different assembly influences. Null models applied to the photosynthetic assemblage revealed that stochastic processes exerted most effect on the assemblage, although the level of community dissimilarity varied between continents in a manner not always consistent with neutral models. The heterotrophic assemblages displayed signatures of niche processes across four continents, whereas in other cases they conformed to neutral predictions. Importantly, for continents where neutrality was either rejected or accepted, assembly drivers differed between the two functional groups. This study demonstrates that multi-trophic microbial systems may not be fully described by a single set of niche or neutral assembly rules and that stochasticity is likely a major determinant of such systems, with significant variation in the influence of these determinants on a global scale.

Green Political Theory

Ecologism or green political theory is the most recent of schools of political thinking. On the one hand, it focuses on issues that are extremely old in politics and philosophical inquiry – such as the relationship between the human and nonhuman worlds, the moral status of animals, what is the ‘good life’, and the ethical and political regulation of technological innovation. Yet on the other, it is also characterised as dealing with some specifically contemporary issues such as the economic and political implications of climate change, peak oil, overconsumption, resource competition and conflicts, and rising levels of global and national inequalities. It is also an extremely broad school of political thought covering a wide variety of concerns, contains a number of distinct sub-schools of green thought (here sharing a similarity with other political ideologies) and combines normative and empirical scientific elements in a unique manner making it distinctive from other political ideologies.

Germany and the New Global History of Secularism: Questioning the Postcolonial Genealogy

Secularism has emerged as a central category of twenty-first century political thought that in many ways has replaced the theory of secularization. According to postcolonial scholars, neither the theory nor the practice of secularization was politically neutral. They define secularism as the set of discourses, policies, and constitutional arrangements whereby modern states and liberal elites have sought to unify nations and divide colonial populations. This definition is quite different from the original meaning of secularism, as an immanent scientific worldview linked to anticlericalism. Anthropologist Talal Asad has connected nineteenth-century worldview secularism to twenty-first century political secularism through a genealogical account that stresses continuities of liberal hegemony. This essay challenges this account. It argues that liberal elites did not merely subsume worldview secularism in their drive for state secularization. Using the tools of conceptual history, the essay shows that one reason that “secularization” only achieved its contemporary meaning in Germany after 1945 was that radical freethinkers and other anticlerical secularists had previously resisted liberal hegemony. The essay concludes by offering an agenda for research into the discontinuous history of these two types of secularism.

Spatial turnover in the global avifauna

Despite its wide implications for many ecological issues, the global pattern of spatial turnover in the occurrence of species has been little studied, unlike the global pattern of species richness. Here, using a database on the breeding distributions of birds, we present the first global maps of variation in spatial turnover for an entire taxonomic class, a pattern that has to date remained largely a matter of conjecture, based on theoretical expectations and extrapolation of inconsistent patterns from different biogeographic realms. We use these maps to test four predictions from niche theory as to the form that this variation should take, namely that turnover should increase with species richness, towards lower latitudes, and with the steepness of environmental gradients and that variation in turnover is determined principally by rare (restricted) species. Contrary to prediction, we show that turnover is high both in areas of extremely low and high species richness, does not increase strongly towards the tropics, and is related both to average environmental conditions and spatial variation in those conditions. These results are closely associated with a further important and novel finding, namely that global patterns of spatial turnover are driven principally by widespread species rather than the restricted ones. This complements recent demonstrations that spatial patterns of species richness are also driven principally by widespread species, and thus provides an important contribution towards a unified model of how terrestrial biodiversity varies both within and between the Earth's major land masses.

Law's Ethical, Global and Theoretical Contexts: Essays in Honour of William Twining

Law's Ethical, Global and Theoretical Contexts examines William Twining's principal contributions to law and jurisprudence in the context of three issues which will receive significant scholarly attention over the coming decades. Part I explores human rights, including torture, the role of evidence in human rights cases, the emerging discourse on 'traditional values', the relevance of 'Southern voices' to human rights debates, and the relationship between human rights and peace agreements. Part II assesses the impact of globalization through the lenses of sociology and comparative constitutionalism, and features an analysis of the development of pluralistic ideas of law in the context of privatization. Finally, Part III addresses issues of legal theory, including whether global legal pluralism needs a concept of law, the importance of context in legal interpretation, the effect of increasing digitalization on legal theory, and the utility of feminist and postmodern approaches to globalization and legal theory.

Fear and Urban Planning in Ordinary Cities: From Theory to Practice

The paper complements Abu-Orf's theory about violent settings by setting out a theory of fear in urban planning in ordinary urban contexts around three arguments: spatialization of fear; (modernist) spatialities and the encounter and political economies of urban fear. The three theoretical arguments are used to re-frame the planning history of Chelas, an affordable housing district in Lisbon, Portugal, and debate the way fear shapes, and is shaped in turn by, planning practice. Confirming that (growing) fear in ordinary urban contexts is not just an effect of the contemporary organization of cities, the paper argues for a theorization of fear that combines global (hegemonic) and a local (discursive/contingent) perspectives in the theorization of urban fear, and advocates for the need to put fear, and its capacity to create a crisis in urban policy, at the heart of planners' agendas.

English as a lingua Franca : bridging the gap between theory and practice in english language teaching

Tese de doutoramento, Linguística (Linguística Aplicada), Universidade de Lisboa, Faculdade de Letras, 2015

Well-Being Freedom and The Possibility of Public-Provision Unit in Global Context

The purpose of this paper is, first, to investigate the interconnections of substantive freedoms, which are indispensable for every individual to “lead the kind of lives they have reason to value” (Sen, 1999b, p.10,18), and which have legitimate and ethical reasons to be publicly secured, second, to investigate a conception of public-provision unit that embodies “the right to well-being freedom”, and a conception of decision-making unit that corresponds to it, based on the perspective of Sen’s capability theory and its extension, comparing with that of Rawls’ Theory of Justice and A Law of People. If we intend to construct such a public-provision unit, which conducts redistribution as a whole, and which receives every individual who cannot belong to any fixed local group, what kind of a body should we assume as a public-provision unit? And further, what kind of a body should we assume as a decision-making unit, which is responsible for deciding or revising the basic conceptions of public provision unit?

Pogge -vs- Sen on Global Poverty and Human Rights

This Paper is part of a broader project examining the ways in which Amartya Sen’s “capability approach” provides a framework for thinking about global poverty as a denial or a violation of basic human rights. The Paper compares the “capability approach” as a basis for thinking about global poverty and human rights with the alternative framework developed by Thomas Pogge. Both the “capability approach” and Pogge’s theory of “severe poverty as a violation of negative duties” support the idea of “freedom from severe poverty as a basic human right”. However, there are important differences. The Paper examines the limitations of Pogge’s “apparent minimalism” and establishes the ways in which Sen’s treatment of the “capability approach” and human rights moves beyond a “minimalist normative position” whilst avoiding Pogge’s charge of “implausibility”.

Global Internet governance and the public interest in communication

Élaborée à partir d’une étude de cas extensive focalisant sur les perspectives multiples et concurrentes ayant émergé lors des négociations sur la gouvernance de l’Internet, thématique ayant dominé l’agenda politique du Sommet mondial sur la société de l’information (SMSI), cette thèse examine les manières avec lesquelles les débats mondiaux sur la gouvernance de l’Internet influencent la notion d’intérêt public en communication. Établie sur la base d’une observation participante extensive, d’entrevues semi-structurées et de l’analyse d’une documentation formelle et informelle associée au SMSI, cette thèse fait état de l’émergence des enjeux associés à la gouvernance de l’Internet au SMSI et présente une analyse approfondie des négociations ayant porté sur cet enjeu. Le cadre théorique développé par Lawrence Lessig au travers duquel « le code est la loi » est appliqué afin d’expliquer comment les différents acteurs ont débattu et ultimement atteint un consensus sur les frontières venant séparer les enjeux normatifs de politique publique et les questions techniques de régulation et de gestion du réseau. Cette thèse discute également de l’évolution des débats autour de la gouvernance mondiale de l’Internet ayant pris place à la suite de la conclusion du SMSI. Sur la base de cette étude de cas, un ensemble de conclusions sont formulées sur les acteurs et les caractéristiques institutionnelles ayant influencé les négociations sur la gouvernance de l’internet. Il est également suggéré que le SMSI a redéfini une discussion étroite sur la gestion d’un ensemble de fonctions techniques de l’Internet en un domaine de politique publique plus large de gouvernance mondiale de l’Internet. Il est également défendu que la notion d’intérêt public dans la gouvernance mondiale de l’Internet est conceptualisée autour des processus de participation et d’intégration des différentes parties prenantes au processus politique. Les implications directes et indirectes qui découlent de ce constat pour comprendre plus largement la notion d’intérêt public dans le domaine de la communication sont également présentées et discutées. En conclusion, cette thèse s’interroge sur les implications programmatiques des éléments ayant été précédemment soulevées pour la recherche médiatique et communicationnelle.

Un modèle global et intégré de la performance : application à l’urgence d’un hôpital au Mexique

À cause de la nature complexe et non linéaire de leurs opérations, les salles d’urgence (SU) constituent des entités organisationnelles uniques dans le domaine de la santé. Les SU subissent des pressions accrues résultant des dynamiques des sociétés contemporaines et de leurs systèmes de santé, et font face ainsi à des défis uniques comme l’engorgement. Contrairement aux croyances dominantes sur le phénomène, le présent travail de recherche établit que ce problème est en réalité une manifestation de pauvre performance systémique plutôt qu’une faillite opérationnelle. Alors, pour les SU, la performance organisationnelle relève une importance incontestable. En effet, l’étude de la performance organisationnelle est un sujet de recherche qui intéresse de nombreux chercheurs des services de santé. Il s’agit, néanmoins, d’un concept historiquement difficile à définir à cause de son caractère complexe, multidimensionnel et paradoxal. Le modèle EGIPSS, basé sur la théorie de l’action sociale de Parsons, est capable de saisir cette complexité et constitue un cadre conceptuel robuste et exhaustif, pouvant s’adapter à des contextes divers. Ce mémoire adopte le modèle EGIPSS pour présenter un outil global et intégré d’évaluation de la performance organisationnelle de la salle d’urgences de l’Hôpital Général Régional 46 à Guadalajara, au Mexique. Cet instrument est conçu pour prendre en compte spécifiquement les particularités propres des SU, ainsi que les caractéristiques organisationnelles uniques de l'Hôpital Général Régional 46. Enfin, le développement de ce projet de mémoire contribue aux efforts d’amélioration continue de la performance de cet établissement, et enrichit les connaissances sur les urgences en tant qu’unités organisationnelles.

Global Justice, Basic Goods and the Sufficiency Threshold Claim

This paper deals with a prevailing assumption that basic goods are accessory to claims of justice. Against such an assumption, the paper advances the idea that basic goods (the core of what I wish to call the sufficiency threshold) are fundamental as a matter of justice. The paper then addresses the question as to what is the elemental justifiability of a social minimum and how that relates to theories of justice, particularly to emerging theories of global justice. The arguments against the aforementioned assumption call upon the strengths of a general theory of justice already in place, namely, John Rawls’s theory of justice and the enriching response and criticism thereof—particularly David Miller’s theory of justice.

Theory and numerical integration of subsurface light transport

En synthèse d’images, reproduire les effets complexes de la lumière sur des matériaux transluminescents, tels que la cire, le marbre ou la peau, contribue grandement au réalisme d’une image. Malheureusement, ce réalisme supplémentaire est couteux en temps de calcul. Les modèles basés sur la théorie de la diffusion visent à réduire ce coût en simulant le comportement physique du transport de la lumière sous surfacique tout en imposant des contraintes de variation sur la lumière incidente et sortante. Une composante importante de ces modèles est leur application à évaluer hiérarchiquement l’intégrale numérique de l’illumination sur la surface d’un objet. Cette thèse révise en premier lieu la littérature actuelle sur la simulation réaliste de la transluminescence, avant d’investiguer plus en profondeur leur application et les extensions des modèles de diffusion en synthèse d’images. Ainsi, nous proposons et évaluons une nouvelle technique d’intégration numérique hiérarchique utilisant une nouvelle analyse fréquentielle de la lumière sortante et incidente pour adapter efficacement le taux d’échantillonnage pendant l’intégration. Nous appliquons cette théorie à plusieurs modèles qui correspondent à l’état de l’art en diffusion, octroyant une amélioration possible à leur efficacité et précision.

Studies on scattering and thermodynamics of black holes in f(R) theory and Einstein's theory

One of the interesting consequences of Einstein's General Theory of Relativity is the black hole solutions. Until the observation made by Hawking in 1970s, it was believed that black holes are perfectly black. The General Theory of Relativity says that black holes are objects which absorb both matter and radiation crossing the event horizon. The event horizon is a surface through which even light is not able to escape. It acts as a one sided membrane that allows the passage of particles only in one direction i.e. towards the center of black holes. All the particles that are absorbed by black hole increases the mass of the black hole and thus the size of event horizon also increases. Hawking showed in 1970s that when applying quantum mechanical laws to black holes they are not perfectly black but they can emit radiation. Thus the black hole can have temperature known as Hawking temperature. In the thesis we have studied some aspects of black holes in f(R) theory of gravity and Einstein's General Theory of Relativity. The scattering of scalar field in this background space time studied in the first chapter shows that the extended black hole will scatter scalar waves and have a scattering cross section and applying tunneling mechanism we have obtained the Hawking temperature of this black hole. In the following chapter we have investigated the quasinormal properties of the extended black hole. We have studied the electromagnetic and scalar perturbations in this space-time and find that the black hole frequencies are complex and show exponential damping indicating the black hole is stable against the perturbations. In the present study we show that not only the black holes exist in modified gravities but also they have similar properties of black hole space times in General Theory of Relativity. 2 + 1 black holes or three dimensional black holes are simplified examples of more complicated four dimensional black holes. Thus these models of black holes are known as toy models of black holes in four dimensional black holes in General theory of Relativity. We have studied some properties of these types of black holes in Einstein model (General Theory of Relativity). A three dimensional black hole known as MSW is taken for our study. The thermodynamics and spectroscopy of MSW black hole are studied and obtained the area spectrum which is equispaced and different thermo dynamical properties are studied. The Dirac perturbation of this three dimensional black hole is studied and the resulting quasinormal spectrum of this three dimensional black hole is obtained. The different quasinormal frequencies are tabulated in tables and these values show an exponential damping of oscillations indicating the black hole is stable against the mass less Dirac perturbation. In General Theory of Relativity almost all solutions contain singularities. The cosmological solution and different black hole solutions of Einstein's field equation contain singularities. The regular black hole solutions are those which are solutions of Einstein's equation and have no singularity at the origin. These solutions possess event horizon but have no central singularity. Such a solution was first put forward by Bardeen. Hayward proposed a similar regular black hole solution. We have studied the thermodynamics and spectroscopy of Hay-ward regular black holes. We have also obtained the different thermodynamic properties and the area spectrum. The area spectrum is a function of the horizon radius. The entropy-heat capacity curve has a discontinuity at some value of entropy showing a phase transition.