5,618 research outputs found
The role of metaphor in shaping the identity and agenda of the United Nations: the imagining of an international community and international threat
This article examines the representation of the United Nations in speeches delivered by its Secretary General. It focuses on the role of metaphor in constructing a common âimaginingâ of international diplomacy and legitimising an international organisational identity. The SG legitimises the organisation, in part, through the delegitimisation of agents/actions/events constructed as threatening to the international community and to the well-being of mankind. It is a desire to combat the forces of menace or evil which are argued to motivate and determine the organisational agenda. This is predicated upon an international ideology of humanity in which difference is silenced and âworking towards the common goodâ is emphasised. This is exploited to rouse emotions and legitimise institutional power. Polarisation and antithesis are achieved through the employment of metaphors designed to enhance positive and negative evaluations. The article further points to the constitutive, persuasive and edifying power of topic and situationally-motivated metaphors in speech-making
Narrating One Nation:The Ideology and Rhetoric of the Miliband Labour Party
Speaking at the 2012 Labour Party Conference, Ed Miliband set out his vision of âOne Nationâ. This article maps the core concepts of Labour's ideology and identifies the narratives used to argue for One Nation social security reform. It locates these narratives within Labour's traditions and demonstrates that they coalesce in the leadership persona of Miliband himself. Though an attempt to respond to a populist ârhetorical cultureâ, the article contends that this strategy has created a selfâenclosed ideology that cannot conceive of an audience beyond itself. Labour therefore needs to overcome this solipsism if it is to secure victory in 2015
Eutectic Colony Formation: A Stability Analysis
Experiments have widely shown that a steady-state lamellar eutectic
solidification front is destabilized on a scale much larger than the lamellar
spacing by the rejection of a dilute ternary impurity and forms two-phase cells
commonly referred to as `eutectic colonies'. We extend the stability analysis
of Datye and Langer for a binary eutectic to include the effect of a ternary
impurity. We find that the expressions for the critical onset velocity and
morphological instability wavelength are analogous to those for the classic
Mullins-Sekerka instability of a monophase planar interface, albeit with an
effective surface tension that depends on the geometry of the lamellar
interface and, non-trivially, on interlamellar diffusion. A qualitatively new
aspect of this instability is the occurence of oscillatory modes due to the
interplay between the destabilizing effect of the ternary impurity and the
dynamical feedback of the local change in lamellar spacing on the front motion.
In a transient regime, these modes lead to the formation of large scale
oscillatory microstructures for which there is recent experimental evidence in
a transparent organic system. Moreover, it is shown that the eutectic front
dynamics on a scale larger than the lamellar spacing can be formulated as an
effective monophase interface free boundary problem with a modified
Gibbs-Thomson condition that is coupled to a slow evolution equation for the
lamellar spacing. This formulation provides additional physical insights into
the nature of the instability and a simple means to calculate an approximate
stability spectrum. Finally, we investigate the influence of the ternary
impurity on a short wavelength oscillatory instability that is already present
at off-eutectic compositions in binary eutectics.Comment: 26 pages RevTex, 14 figures (28 EPS files); some minor changes;
references adde
Measurement of corrosion content of archaeological lead artifacts by their Meissner response in the superconducting state; a new dating method
Meissner fraction in the superconducting state of lead archaeological
artifacts is used to evaluate the mass of the uncorroded metal in the sample.
Knowing the total mass of the sample the mass of all corrosion products is
established. It is shown that this mass correlates with the archaeological age
of the lead artifacts over a time span of ~2500 years. Well-dated untreated
lead samples from Tel-Dor, the Persian period, Caesarea, the Byzantine and the
Crusader periods as well as contemporary data were used to establish the dating
correlation. This new chemical dating method is apparently applicable to lead
artifacts buried in soils with the pH>6.5. In such soils the corrosion process
is very slow and the corrosion products, mainly PbO and PbCO3, accumulate over
hundreds of years. The method presented is in principle non-destructive.
(corresponding author: )Comment: File ARCH_4.pdf 14 pages including 1 table and 5 figure
Environmental flow requirements of estuaries: providing resilience to current and future climate and direct anthropogenic changes
Estuaries host unique biodiversity and deliver a range of ecosystem services at the interface between catchment and the ocean. They are also among the most degraded ecosystems on Earth. Freshwater flow regimes drive ecological processes contributing to their biodiversity and economic value, but have been modified extensively in many systems by upstream water use. Knowledge of freshwater flow requirements for estuaries (environmental flows or E-flows) lags behind that of rivers and their floodplains. Generalising estuarine E-flows is further complicated by responses that appear to be specific to each system. Here we critically review the E-flow requirements of estuaries to 1) identify the key ecosystem processes (hydrodynamics, salinity regulation, sediment dynamics, nutrient cycling and trophic transfer, and connectivity) modulated by freshwater flow regimes, 2) identify key drivers (rainfall, runoff, temperature, sea level rise and direct anthropogenic) that generate changes to the magnitude, quality and timing of flows, and 3) propose mitigation strategies (e.g., modification of dam operations and habitat restoration) to buffer against the risks of altered freshwater flows and build resilience to direct and indirect anthropogenic disturbances. These strategies support re-establishment of the natural characteristics of freshwater flow regimes which are foundational to healthy estuarine ecosystems
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