4,147 research outputs found
Ouverture de "Marketing Channels and Global Markets"
An over-supply condition and the global markets favour a 'widespread selectivity' of consumption, and they require, on the one hand, new rules for competition between manufacturers, and on the other, they also stimulate new marketing channels strategies, as an economic and relational entity as a whole. From this point of view, it is important first analyse some key issues relating to marketing channels, and then focusing attention on certain aspects, such as innovation, the impact of technology on the consumer buying process and on his own buying habits, and finally the extension of the retailers offer to non-core services, particularly financial services.Marketing Channels; Global Markets; Over-Supply; Channel Innovation; Buyer Behaviour; Retail Financial Services
Italy in the Middle East and the Mediterranean: The evolving relations with Egypt and Libya
The Mediterranean and the Middle East have long constituted an important “circle” in Italy’s foreign policy, with Egypt and Libya playing a particularly important role. During 2016, two sources of tension emerged in Italy’s relations with these countries. The first reflects a wider European situation. Like the rest of the EU, Italy has followed strategic interests—on migration, energy, and security—that sometimes conflict with the promotion of human rights, democracy, and the rule of law, which the EU claims to promote in its external relations. The Regeni affair, involving a murdered Italian graduate student, exemplified this tension. The second source results from the role of corporate interests in Italy, especially those of oil and energy companies, in relation to the country’s “national interests.” Italian foreign policy toward both Libya and Egypt seems to have been driven by a combination of somewhat overlapping but also divergent national and corporate interests
Hamiltonian flows on null curves
The local motion of a null curve in Minkowski 3-space induces an evolution
equation for its Lorentz invariant curvature. Special motions are constructed
whose induced evolution equations are the members of the KdV hierarchy. The
null curves which move under the KdV flow without changing shape are proven to
be the trajectories of a certain particle model on null curves described by a
Lagrangian linear in the curvature. In addition, it is shown that the curvature
of a null curve which evolves by similarities can be computed in terms of the
solutions of the second Painlev\'e equation.Comment: 14 pages, v2: final version; minor changes in the expositio
Reduction for constrained variational problems on 3D null curves
We consider the optimal control problem for null curves in de Sitter 3-space
defined by a functional which is linear in the curvature of the trajectory. We
show how techniques based on the method of moving frames and exterior
differential systems, coupled with the reduction procedure for systems with a
Lie group of symmetries lead to the integration by quadratures of the
extremals. Explicit solutions are found in terms of elliptic functions and
integrals.Comment: 16 page
Classical Dynamical Systems from q-algebras:"cluster" variables and explicit solutions
A general procedure to get the explicit solution of the equations of motion
for N-body classical Hamiltonian systems equipped with coalgebra symmetry is
introduced by defining a set of appropriate collective variables which are
based on the iterations of the coproduct map on the generators of the algebra.
In this way several examples of N-body dynamical systems obtained from
q-Poisson algebras are explicitly solved: the q-deformed version of the sl(2)
Calogero-Gaudin system (q-CG), a q-Poincare' Gaudin system and a system of
Ruijsenaars type arising from the same (non co-boundary) q-deformation of the
(1+1) Poincare' algebra. Also, a unified interpretation of all these systems as
different Poisson-Lie dynamics on the same three dimensional solvable Lie group
is given.Comment: 19 Latex pages, No figure
The Ljapunov-Schmidt reduction for some critical problems
This is a survey about the application of the Ljapunov-Schmidt reduction for
some critical problems
An evolutionary model with Turing machines
The development of a large non-coding fraction in eukaryotic DNA and the
phenomenon of the code-bloat in the field of evolutionary computations show a
striking similarity. This seems to suggest that (in the presence of mechanisms
of code growth) the evolution of a complex code can't be attained without
maintaining a large inactive fraction. To test this hypothesis we performed
computer simulations of an evolutionary toy model for Turing machines, studying
the relations among fitness and coding/non-coding ratio while varying mutation
and code growth rates. The results suggest that, in our model, having a large
reservoir of non-coding states constitutes a great (long term) evolutionary
advantage.Comment: 16 pages, 7 figure
Closed trajectories of a particle model on null curves in anti-de Sitter 3-space
We study the existence of closed trajectories of a particle model on null
curves in anti-de Sitter 3-space defined by a functional which is linear in the
curvature of the particle path. Explicit expressions for the trajectories are
found and the existence of infinitely many closed trajectories is proved.Comment: 12 pages, 1 figur
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