20,732 research outputs found
Adaptive multiresolution computations applied to detonations
A space-time adaptive method is presented for the reactive Euler equations
describing chemically reacting gas flow where a two species model is used for
the chemistry. The governing equations are discretized with a finite volume
method and dynamic space adaptivity is introduced using multiresolution
analysis. A time splitting method of Strang is applied to be able to consider
stiff problems while keeping the method explicit. For time adaptivity an
improved Runge--Kutta--Fehlberg scheme is used. Applications deal with
detonation problems in one and two space dimensions. A comparison of the
adaptive scheme with reference computations on a regular grid allow to assess
the accuracy and the computational efficiency, in terms of CPU time and memory
requirements.Comment: Zeitschrift f\"ur Physicalische Chemie, accepte
Is the Interpretation of Delayed-Choice Experiments Misleading?
The interpretation of an experimental realization of Wheeler's delayed-choice
gedanken experiment is discussed and called into question.Comment: 5 pages Te
Solving the strongly coupled 2D gravity III: String susceptibility and topological N-point functions
We spell out the derivation of novel features, put forward earlier in a
letter, of two dimensional gravity in the strong coupling regime, at ,
13, 19. Within the operator approach previously developed, they neatly follow
from the appearence of a new cosmological term/marginal operator, different
from the standard weak-coupling one, that determines the world sheet
interaction. The corresponding string susceptibility is obtained and found real
contrary to the continuation of the KPZ formula. Strongly coupled (topological
like) models--only involving zero-mode degrees of freedom--are solved up to
sixth order, using the ward identities which follow from the dependence upon
the new cosmological constant. They are technically similar to the weakly
coupled ones, which reproduce the matrix model results, but gravity and matter
quantum numbers are entangled differently.Comment: 21 pages, latex, 10 figure
How to Complete Regulations in Multi-agent Systems
In this paper, we deal with regulations that may exist in multiagent systems in order to regulate agent behaviour. More precisely, we discuss two properties of regulations, consistency and ompleteness. After defining what consistency and completeness mean, we propose a way to consistently complete incomplete regulations. This contribution considers that regulations are expressed in a first order deontic logic. We will focus on particular regulations: information exchange policies
A modal logic for reasoning on consistency and completeness of regulations
In this paper, we deal with regulations that may exist in multi-agent systems in order to regulate agent behaviour and we discuss two properties of regulations, that is consistency and completeness. After defining what consistency and completeness mean, we propose a way to consistently complete incomplete regulations. In this contribution, we extend previous works and we consider that regulations are expressed in a first order modal deontic logic
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