5,521 research outputs found
Digging and Destruction: Artifact Collecting as Meaningful Social Practice
Collected sites are commonly seen as places requiring expert intervention to ‘save the past’ from destruction by artifact collectors and looters. Despite engaging directly with the physical effects of collecting and vandalism, little attention is given to the meanings of these actions and the contributions they make to the stories told about sites or the past more broadly. Professional archaeologists often position their engagement with site destruction as heritage ‘salvage’ and regard collecting as lacking any value in contemporary society. Repositioning collecting as meaningful social practice and heritage action raises the question: in failing to understand legal or illegal collecting as significant to heritage, have archaeologists contributed to the erasure of acts that aim to work out identities, memories and senses of place, and contribute to an individual’s or group’s sense of ontological security? This question is explored through a case study from the New England region of North America where archaeologists have allied with Native American and other stakeholders to advocate for heritage protection by taking an anti-looting/collecting stance. We explore alternatives to this position that engage directly with forms of collecting as meaningful social practices that are largely erased in site narratives
Önkéntesség és közösségfejlesztés = Volunteerism and community development
Dolgozatom központi témája az önkéntesség, annak mind a formális (szervezeti), mind az informális (szervezeten kÃvüli) változata. Magyarországon a rendszerváltás óta egy sor tanulmány született az önkéntességrÅ‘l, és ismert annak formális és informális csoportosÃtása is, e dichotómia mégis viszonylag ritkán került a kutatói figyelem középpontjába. Ugyancsak kevés tanulmány összpontosÃt a többváltozós statisztikai adatelemzés módszereit felhasználó ok-okozati összefüggésekre önkéntesség témakörben. Dolgozatom ezen hiányokat kÃvánja pótolni úgy, hogy egyrészt kiemeli a formális és informális önkéntesség elkülönÃtésének fontosságát, másrészt a különbségeket több tényezÅ‘vel - társadalmi státus, motiváció – magyarázza is. Az önkéntesség vizsgálatának különleges aktualitását 2011-ben az adja, hogy ezt az évet az Európai Tanács az Önkéntesség Európai Évének nyilvánÃtotta
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 ‘imagining’ 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 ‘working towards the common good’ 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
Valuing lives equally in a benefit-cost analysis of safety projects: a method to reconcile theory and practice
Space capsule Patent
Manned space capsule configuration for orbital flight and atmospheric reentr
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Landslides on Ceres: Diversity and Geologic Context.
Landslides are among the most widespread geologic features on Ceres. Using data from Dawn's Framing Camera, landslides were previously classified based upon geomorphologic characteristics into one of three archetypal categories, Type 1(T1), Type 2 (T2), and Type 3 (T3). Due to their geologic context, variation in age, and physical characteristics, most landslides on Ceres are, however, intermediate in their morphology and physical properties between the archetypes of each landslide class. Here we describe the varied morphology of individual intermediate landslides, identify geologic controls that contribute to this variation, and provide first-order quantification of the physical properties of the continuum of Ceres's surface flows. These intermediate flows appear in varied settings and show a range of characteristics, including those found at contacts between craters, those having multiple trunks or lobes; showing characteristics of both T2 and T3 landslides; material slumping on crater rims; very small, ejecta-like flows; and those appearing inside of catenae. We suggest that while their morphologies can vary, the distribution and mechanical properties of intermediate landslides do not differ significantly from that of archetypal landslides, confirming a link between landslides and subsurface ice. We also find that most intermediate landslides are similar to Type 2 landslides and formed by shallow failure. Clusters of these features suggest ice enhancement near Juling, Kupalo and Urvara craters. Since the majority of Ceres's landslides fall in the intermediate landslide category, placing their attributes in context contributes to a better understanding of Ceres's shallow subsurface and the nature of ground ice
Efficient computation of matched solutions of the Kapchinskij-Vladimirskij envelope equations for periodic focusing lattices
A new iterative method is developed to numerically calculate the periodic,
matched beam envelope solution of the coupled Kapchinskij-Vladimirskij (KV)
equations describing the transverse evolution of a beam in a periodic, linear
focusing lattice of arbitrary complexity. Implementation of the method is
straightforward. It is highly convergent and can be applied to all usual
parameterizations of the matched envelope solutions. The method is applicable
to all classes of linear focusing lattices without skew couplings, and also
applies to all physically achievable system parameters -- including where the
matched beam envelope is strongly unstable. Example applications are presented
for periodic solenoidal and quadrupole focusing lattices. Convergence
properties are summarized over a wide range of system parameters.Comment: 20 pages, 5 figures, Mathematica source code provide
Pamela: development of the RF system for a non-relativistic non-scaling FFAG
The PAMELA project(Particle Accelerator For MEdical
Applications) currently consists of the design of a particle
therapy facility. The project, which is in the design phase,
contains Non-Scaling FFAG, particle accelerator capable
of rapid beam acceleration, giving a pulse repetition rate of
1kHz, far beyond that of a conventional synchrotron. To
realise the repetition rate, a key component of the accelerator
is the rf accelerating system. The combination of a high
energy gain per turn and a high repetition rate is a significant
challenge. In this paper, options for the rf system of
the proton ring and the status of development are presented
On the possibility of magneto-structural correlations: detailed studies of di-nickel carboxylate complexes
A series of water-bridged dinickel complexes of the general formula [Ni<sub>2</sub>(μ<sub>2</sub>-OH<sub>2</sub>)(μ2-
O<sub>2</sub>C<sup>t</sup>Bu)<sub>2</sub>(O<sub>2</sub>C<sup>t</sup>Bu)2(L)(L0)] (L = HO<sub>2</sub>C<sup>t</sup>Bu, L0 = HO<sub>2</sub>C<sup>t</sup>Bu (1), pyridine (2),
3-methylpyridine (4); L = L0 = pyridine (3), 3-methylpyridine (5)) has been synthesized
and structurally characterized by X-ray crystallography. The magnetic properties
have been probed by magnetometry and EPR spectroscopy, and detailed measurements
show that the axial zero-field splitting, D, of the nickel(ii) ions is on the same order as
the isotropic exchange interaction, J, between the nickel sites. The isotropic exchange
interaction can be related to the angle between the nickel centers and the bridging
water molecule, while the magnitude of D can be related to the coordination sphere at
the nickel sites
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Efficient computation of matched solutions of the KV envelope equations for periodic focusing lattices.
A new iterative method is developed to numerically calculate the periodic, matched beam envelope solution of the coupled Kapchinskij-Vladimirskij (KV) equations describing the transverse evolution of a beam in a periodic, linear focusing lattice of arbitrary complexity. Implementation of the method is straightforward. It is highly convergent and can be applied to all usual parameterizations of the matched envelope solutions. The method is applicable to all classes of linear focusing lattices without skew couplings, and also applies to parameters where the matched beam envelope is strongly unstable. Example applications are presented for periodic solenoidal and quadrupole focusing lattices. Convergence properties are summarized over a wide range of system parameters
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