1,071 research outputs found
The hospitality phenomenon: philosophical enlightenment?
The emergent paradigm of hospitality studies does not have a coherent philosophical foundation. In seeking to identify a philosophy of hospitality this paper explores Derrida's contribution, along with other writers in philosophy and postcolonial theory, who are either writing in the field or have developed his works. Derrida and others are often cited within the context of the emerging paradigm of hospitality studies. In order to examine and critically evaluate the possibility of the construct of a philosophy of the phenomenon of hospitality, the review of the philosophical concepts is set within three perspectives: individual moral philosophy; hospitality and the nation states, and hospitality and language. Although examining the writings of Derrida and others provides an insight into the phenomenon of hospitality, a coherent philosophy of hospitality seems to be an enigma; possibly because hospitality is not a matter of objective knowledge
Ytterbium divalency and lattice disorder in near-zero thermal expansion YbGaGe
While near-zero thermal expansion (NZTE) in YbGaGe is sensitive to
stoichiometry and defect concentration, the NZTE mechanism remains elusive. We
present x-ray absorption spectra that show unequivocally that Yb is nearly
divalent in YbGaGe and the valence does not change with temperature or with
nominally 1% B or 5% C impurities, ruling out a valence-fluctuation mechanism.
Moreover, substantial changes occur in the local structure around Yb with B and
C inclusion. Together with inelastic neutron scattering measurements, these
data indicate a strong tendency for the lattice to disorder, providing a
possible explanation for NZTE in YbGaGe.Comment: 4 pages, 4 figure, supplementary inf
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Enterprise and entrepreneurship in the Caribbean region: introduction to the special issue
Entrepreneurship as a pseudo-discipline has matured to the point where it has begun to question the myths which have developed around it. As a panacea for the development ills of capitalism, studies have spanned various ideological and methodological viewpoints. Spatially, entrepreneurship studies have grown to include countries of the Global South and emerging economies, particularly those of Eastern Europe. This special issue extends this reach to the small developing states of the Caribbean and particularly those with a British colonial legacy rooted in the remnants of the plantation economy. The commencement of political independence in the 1960s has not resulted in any significant economic independence for the region as it remains dependent on foreign investment, whilst its key sectors remain subject to the volatility of the economies of the global north. The papers in this special issue identify domestic and enterprise level constraints to the development of entrepreneurship in the region. This Introduction places these, mostly micro-level studies, in a wider context, concluding that policy-makers need to better understand the concept of entrepreneurship and its role in achieving developmental goals. Our challenging recommendation is that those formulating and delivering these policies and practices should do so with an entrepreneurial mind-set
Elastic and thermodynamic properties of the shape-memory alloy AuZn
The current work reports on the elastic shear moduli, internal friction, and
the specific heat of the B2 cubic ordered alloy AuZn as a function of
temperature. Measurements were made on single-crystal and polycrystalline
samples using Resonant Ultrasound Spectroscopy (RUS), semi-adiabatic
calorimetry and stress-strain measurements. Our results confirm that this alloy
exhibits the shape-memory effect and a phase transition at 64.75 K that appears
to be continuous (second-order) from the specific heat data. It is argued that
the combination of equiatomic composition and a low transformation temperature
constrain the chemical potential and its derivatives to exhibit behavior that
lies at the borderline between that of a first-order (discontinuous) and a
continuous phase transition. The acoustic dissipation does not peak at the
transtion temperature as expected, but shows a maximum well into the
low-temperature phase. The Debye temeprature value of 219 K, obtained from the
low-temperature specific heat data is in favorable agreement with that
determined from the acoustic data (207 K) above the transition.Comment: 25 pages, 6 figures, submitted to Phys. Rev.
Catastrophic Fermi surface reconstruction in the shape-memory alloy AuZn
AuZn undergoes a shape-memory transition at 67 K. The de Haas van Alphen
effect persists to 100 K enabling the observation of a change in the quantum
oscillation spectrum indicative of a catastrophic Fermi surface reconstruction
at the transition. Coexistence of both Fermi surfaces at low temperatures is
suggestive of an intrinsic phase separation in the bulk of the material. In
addition, a Dingle analysis reveals a sharp change in the scattering mechanism
at a threshold cyclotron radius, which we suggest to be related to the
underlying microstructure that drives the shape-memory effect.Comment: 4 pages, 4 figure
Multiconfigurational nature of 5f orbitals in uranium and plutonium intermetallics
Uranium and plutonium's 5f electrons are tenuously poised between strongly
bonding with ligand spd-states and residing close to the nucleus. The unusual
properties of these elements and their compounds (eg. the six different
allotropes of elemental plutonium) are widely believed to depend on the related
attributes of f-orbital occupancy and delocalization, for which a quantitative
measure is lacking. By employing resonant x-ray emission spectroscopy (RXES)
and x-ray absorption near-edge structure (XANES) spectroscopy and making
comparisons to specific heat measurements, we demonstrate the presence of
multiconfigurational f-orbital states in the actinide elements U and Pu, and in
a wide range of uranium and plutonium intermetallic compounds. These results
provide a robust experimental basis for a new framework for understanding the
strongly-correlated behavior of actinide materials.Comment: 30 pages, concatenated article and supporting information, 10 figure
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