20,319 research outputs found
Is a Dominant Service-Centric Sector Good for Diversity of Provision?
An obvious assumption underpinning the immense interest in service-oriented computing is that it is an inherently Good Thing, by which we mean that robust processes and tools for developing service-based systems will bring benefits for service providers and service consumers. The arguments, in terms of consumer choice and flexibility, are certainly quite convincing. However, in this position paper, we question the nature of the underlying assumption, in a world where requirements are as many and varied as potential users and ask if safeguards are needed to ensure that diversity of provision is maintained
Initial post-buckling behavior of toroidal shell segments
Initial post-buckling behavior of toroidal shell segment
On relations between one-dimensional quantum and two-dimensional classical spin systems
We exploit mappings between quantum and classical systems in order to obtain
a class of two-dimensional classical systems with critical properties
equivalent to those of the class of one-dimensional quantum systems discussed
in a companion paper (J. Hutchinson, J. P. Keating, and F. Mezzadri,
arXiv:1503.05732). In particular, we use three approaches: the Trotter-Suzuki
mapping; the method of coherent states; and a calculation based on commuting
the quantum Hamiltonian with the transfer matrix of a classical system. This
enables us to establish universality of certain critical phenomena by extension
from the results in our previous article for the classical systems identified.Comment: 36 page
Buckling of imperfect cylindrical shells under axial compression and external pressure
Axisymmetric deformation effects on cylindrical shell buckling under axial compressio
Fisher Hartwig determinants, conformal field theory and universality in generalised XX models
We discuss certain quadratic models of spinless fermions on a 1D lattice, and
their corresponding spin chains. These were studied by Keating and Mezzadri in
the context of their relation to the Haar measures of the classical compact
groups. We show how these models correspond to translation invariant models on
an infinite or semi-infinite chain, which in the simplest case reduce to the
familiar XX model. We give physical context to mathematical results for the
entanglement entropy, and calculate the spin-spin correlation functions using
the Fisher-Hartwig conjecture. These calculations rigorously demonstrate
universality in classes of these models. We show that these are in agreement
with field theoretic and renormalization group arguments that we provide
Nonlinear quantum optical computing via measurement
We show how the measurement induced model of quantum computation proposed by
Raussendorf and Briegel [Phys. Rev. Letts. 86, 5188 (2001)] can be adapted to a
nonlinear optical interaction. This optical implementation requires a Kerr
nonlinearity, a single photon source, a single photon detector and fast feed
forward. Although nondeterministic optical quantum information proposals such
as that suggested by KLM [Nature 409, 46 (2001)] do not require a Kerr
nonlinearity they do require complex reconfigurable optical networks. The
proposal in this paper has the benefit of a single static optical layout with
fixed device parameters, where the algorithm is defined by the final
measurement procedure.Comment: 14 pages, 4 figures, 4 table
Dynamic buckling estimates
Dynamic buckling estimates for sensitive structures subjected to finite-time loadin
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