4 resultados para puzzles

em CentAUR: Central Archive University of Reading - UK


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This essay aims to make a contribution to the conversation between IR and nationalism literatures by considering a particular question: What is the relationship between interstate military competition and the emergence of nationalism as a potent force in world politics? The conventional wisdom among international security scholars, especially neorealists, holds that nationalism can be more or less treated like a “technology” that allowed states to extract significant resources as well as manpower from their respective populations. This paper underlines some of the problems involved with this perspective and pushes forward an interpretation that is based on the logic of political survival. I argue that nationalism’s emergence as a powerful force in world politics followed from the “mutation” and absorption of the universalistic/cosmopolitan republican ideas that gained temporary primacy in Europe during the eighteenth century into particularistic nationalist ideologies. This transformation, in turn, can be best explained by the French Revolution’s dramatic impacts on rulers’ political survival calculi vis-à-vis both interstate and domestic political challenges. The analysis offered in this essay contributes to our understanding of the relationship between IR and nationalism while also highlighting the potential value of the political survival framework for exploring macrohistorical puzzles.

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An overview is given of current issues concerning the coupling between the stratosphere and troposphere. The tropopause region, more generally the upper troposphere/lower stratosphere, is the region of direct contact where exchange of material takes place. Dynamical coupling through angular momentum transfer by waves occurs nonlocally, and provides a generally negative torque on the stratosphere which drives an equator-to-pole circulation (i.e., towards the Earth’s axis of rotation). This wave-driven circulation is the principal mechanism for intraseasonal and interannual variability in the extratropical stratosphere. Although such variability is generally dynamical in origin, there are important chemical and radiative feedbacks. The location of the tropopause has implications for radiative forcing of climate, through its effect on the distribution of relatively short-lived greenhouse gases (ozone and water vapour). Some outstanding puzzles in our current understanding are identified. Attention is focused on possible climate sensitivities, and how these may be tested and constrained. Results from the Canadian Middle Atmosphere Model (CMAM), a fully interactive radiative-chemical-dynamical general circulation model, are used to illustrate some of the points.

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Early modern play-texts present numerous puzzles for scholars interested in ascertaining how plays were (or may have been) staged. the principal evidence of course for a notional "reconstruction" of practices is the apparatus of stage directions, augmented by indications in the dialogue. in conjunction a joining-of-the-dots is often possible, at least in broad-brush terms. But as is well known, the problem is that stage directions tend to be incomplete, imprecise, inaccurate ­ or missing altogether; more significantly, even when present they offer only slight and indirect evidence of actual stagecraft. Some stage directions are rather more "literary" than "theatrical" in provenance, and in any case to the extent that they do serve the reader (early modern or modern) they cannot be regarded as providing a record of stage practice. After all, words can be no more than imperfect substitutes for (and of another order from) the things they represent. For the most part directions serve as a guide that provides the basis for reasonable interpretation informed by our knowledge of theatre architecture, technology, and comparable play-situations, rather than concrete evidence of actual practice. Quite how some stage business was carried out remains uncertain, leaving the scholar little option but to hypothesize solutions. One such conundrum arises in christopher Marlowe's The Jew of Malta. the scenario in question is hardly an obscure one, but it has not been examined in detail, even by modern editors. the purpose of this essay is to explore what sense might be made of the surviving textual evidence, in combination with our knowledge of theatre architecture and playmaking culture in the late sixteenth century.

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Fundamental puzzles of climate science remain unsolved because of our limited understanding of how clouds, circulation and climate interact. One example is our inability to provide robust assessments of future global and regional climate changes. However, ongoing advances in our capacity to observe, simulate and conceptualize the climate system now make it possible to fill gaps in our knowledge. We argue that progress can be accelerated by focusing research on a handful of important scientific questions that have become tractable as a result of recent advances. We propose four such questions below; they involve understanding the role of cloud feedbacks and convective organization in climate, and the factors that control the position, the strength and the variability of the tropical rain belts and the extratropical storm tracks.