365 research outputs found
Consolidation in the air transport sector and antitrust enforcement in Europe
The paper aims at analysing the role for Antitrust intervention in the light of the consolidation trend of the airline industry in Europe. The almost full liberalization in the aviation sector (at least for intra-community routes) leaded to a situation where, at the same time, (i) new players have been entering the market with an increase in competition (actual and potential) on EU routes, and (ii) deep forms of co-operation (alliances and code sharing) and integration (mergers) have been exploited to better perform at national and international level. The paper highlights the economic analysis behind Antitrust assessment in the evaluation of mergers and cooperation agreements in the air transport sector. Consolidated standards for market definition, competitive assessment and feasible remedies are presented and discussed in the light of the relevant EU case law. Moreover, according to the radical changes occurring in the industry – i.e. the emergence of peculiar market forces such as low cost carriers and their interaction with traditional full service carriers – some preliminary considerations are introduced on the likely need for adjusting the assessment criteria for an effective Antitrust intervention
Efficient hyperbolic-parabolic models on multi-dimensional unbounded domains using an extended DG approach
We introduce an extended discontinuous Galerkin discretization of
hyperbolic-parabolic problems on multidimensional semi-infinite domains.
Building on previous work on the one-dimensional case, we split the
strip-shaped computational domain into a bounded region, discretized by means
of discontinuous finite elements using Legendre basis functions, and an
unbounded subdomain, where scaled Laguerre functions are used as a basis.
Numerical fluxes at the interface allow for a seamless coupling of the two
regions. The resulting coupling strategy is shown to produce accurate numerical
solutions in tests on both linear and non-linear scalar and vectorial model
problems. In addition, an efficient absorbing layer can be simulated in the
semi-infinite part of the domain in order to damp outgoing signals with
negligible spurious reflections at the interface. By tuning the scaling
parameter of the Laguerre basis functions, the extended DG scheme simulates
transient dynamics over large spatial scales with a substantial reduction in
computational cost at a given accuracy level compared to standard single-domain
discontinuous finite element techniques.Comment: 28 pages, 13 figure
A semi-implicit compressible model for atmospheric flows with seamless access to soundproof and hydrostatic dynamics
We introduce a second-order numerical scheme for compressible atmospheric motions at small to planetary scales. The collocated finite volume method treats the advection of mass, momentum, and mass-weighted potential temperature in conservation form while relying on Exner pressure for the pressure gradient term. It discretises the rotating compressible equations by evolving full variables rather than perturbations around a background state, and operates with time steps constrained by the advection speed only. Perturbation variables are only used as auxiliary quantities in the formulation of the elliptic problem. Borrowing ideas on forward-in-time differencing, the algorithm reframes the authors' previously proposed schemes into a sequence of implicit midpoint, advection, and implicit trapezoidal steps that allows for a time integration unconstrained by the internal gravity wave speed. Compared with existing approaches, results on a range of benchmarks of nonhydrostatic- and
hydrostatic-scale dynamics are competitive. The test suite includes a new planetary-scale inertia-gravity wave test highlighting the properties of the scheme and its large time step capabilities. In the hydrostatic-scale cases the model is run in pseudo-incompressible and hydrostatic mode with simple switching within a uniform discretization framework. The differences with the compressible runs return expected relative magnitudes. By providing seamless access to soundproof and hydrostatic dynamics, the developments represent a necessary step towards an all-scale blended multimodel solver
Database activity in the Italian Astronet: DIRA 2
The development and utilization of informational archives and databases started, in the Italian Astronet Project, in the middle of 1983. In that year, a small group of astronomers and some more technical people met together in an Astronet working group, with a common, painful experience in managing astronomical catalogues and archives with computers. Nowadays, some years later, some software packages and the contents of both, a relative general database and several local databases represent the work and the effort of the group. The systems have been conceived and developed keeping in mind the original goal of the group: to allow the single atronomer to make a free use of original data. The main package (DIRA) was rewritten, after some years of use, to fully take advantage of the several suggestions of the astronomer that used it and gathered experiences in the astronomical catalog's management. A more technical goal was to install the whole system, born and developed in the vms environment, on unix and unix-like systems. This new version, DIRA2, has a new user interface, a query language with SQL style commands supporting numerical and character functions also and a set of commands to create new catalogues from existing data. The graphics commands are also more powerful with respect to the previous version. DIRA (and DIRA2 of course) philosophy and design are very simple and proved to be very appreciated by astronomers, namely, to normalize and homogenize, at minimum, astronomical catalogues, to collect satisfactory astronomical documentation on their contents and, finally, to allow an astronomical approach to the dialogue with the database. DIRA2 is currently used in most Italian astronomical institutes to retrieve data from a still growing database of about 140 well documented and controlled astronomical catalogues, for the identification of objects and the preparation of a 'medium size' survey, in astrometry and in the creation of new catalogues
An IMEX-DG solver for atmospheric dynamics simulations with adaptive mesh refinement
We present an accurate and efficient solver for atmospheric dynamics
simulations that allows for non-conforming mesh refinement. The model equations
are the conservative Euler equations for compressible flows. The numerical
method is based on an adaptive Discontinuous Galerkin spatial
discretization and on a second order Additive Runge Kutta IMEX method for time
discretization, especially designed for low Mach regimes. The solver is
implemented in the framework of the library, whose mesh refinement
capabilities are employed to enhance efficiency. A number of numerical
experiments based on classical benchmarks for atmosphere dynamics demonstrate
the properties and advantages of the proposed method
Which Antitrust Rules Are Suitable for Promoting Sustainable Competition in the Liner Shipping Industry?
A blended soundproof-to-compressible numerical model for small- to mesoscale atmospheric dynamic
A blended model for atmospheric flow simulations is introduced that enables seamless transition from semi-implicit fully compressible to pseudo-incompressible dynamics.
The model equations are written in non-perturbational form and integrated using a wellbalanced second-order finite volume discretization. The scheme combines an explicit
predictor for advection with elliptic corrections for the pressure field. Compressibility is implemented through a diagonal term in the elliptic equation. The compressible/soundproof transition is realized by weighting this term appropriately and it provides a mechanism for removing unwanted acoustic imbalances in compressible runs, with potential ramifications for data assimilation.
As the thermodynamic pressure gradient is used in the momentum equation, the influence of perturbation pressure on buoyancy is included for thermodynamic consistency. This model is equivalent to Durran's original pseudo- incompressible model, which uses the Exner pressure.
Numerical experiments demonstrate quadratic convergence and competitive solution quality for several benchmarks. With the thermodynamically consistent buoyancy correction the "p-\rho-formulation" of the sound-proof model closely reproduces the compressible results.
The proposed approach offers a framework for model comparison largely free of biases due to different discretizations. With data assimilation applications in mind, the seamless compressible-sound-proof transition mechanism is also shown to enable the removal of acoustic imbalances in initial data for which balanced pressure distributions are unknown
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