1,106 research outputs found
Demande de congés de M. Ruffo de Léric, lors de la séance du 9 mai 1790
No full textRuffo de Laric Claude Marie. Demande de congés de M. Ruffo de Léric, lors de la séance du 9 mai 1790. In: Archives Parlementaires de 1787 à 1860 - Première série (1787-1799) Tome XV - Du 21 avril au 30 mai 1790. Paris : Librairie Administrative P. Dupont, 1883. p. 452
Dynamics and thermodynamics of systems with long-range interactions
No full textProperties of systems with long range interactions are still poorly understood despite being of importance in most areas of physics. The present volume introduces and reviews the effort of constructing a coherent thermodynamic treatment of such systems by combining tools from statistical mechanics with concepts and methods from dynamical systems. Analogies and differences between various systems are examined by considering a large range of applications, with emphasis on Bose--Einstein condensates. Written as a set of tutorial reviews, the book will be useful for both the experienced researcher as well as the nonexpert scientist or postgraduate student
One-dimensional lattice of oscillators coupled through power-law interactions: Continuum limit and dynamics of spatial Fourier modes
No full textWe study synchronization in a system of phase-only oscillators residing on the sites of a one-dimensional periodic lattice. The oscillators interact with a strength that decays as a power law of the separation along the lattice length and is normalized by a size-dependent constant. The exponent ? of the power law is taken in the range 0??<1. The oscillator frequency distribution is symmetric about its mean (taken to be zero) and is nonincreasing on [0,?). In the continuum limit, the local density of oscillators evolves in time following the continuity equation that expresses the conservation of the number of oscillators of each frequency under the dynamics. This equation admits as a stationary solution the unsynchronized state uniform both in phase and over the space of the lattice. We perform a linear stability analysis of this state to show that when it is unstable, different spatial Fourier modes of fluctuations have different stability thresholds beyond which they grow exponentially in time with rates that depend on the Fourier modes. However, numerical simulations show that at long times all the nonzero Fourier modes decay in time, while only the zero Fourier mode (i.e., the “mean-field” mode) grows in time, thereby dominating the instability process and driving the system to a synchronized state. Our theoretical analysis is supported by extensive numerical simulations.Delft Center for Systems and ControlMechanical, Maritime and Materials Engineerin
Appropriatezza dei controlli ufficiali condotti ai sensi del Reg. (Ce) n. 854/2004 : Proposta operativa per la valutazione di adeguatezza e produttività delle risorse umane impiegate nei servizi di igiene degli alimenti di origine animale delle ASL
No full textThe article wants to provide the Italian ASL Departments of Veterinary Prevention, relating to
"Hygiene of Food of Animal Origin" (area B), an operational tool, based on objective data, in order
to ensure compliance with the provisions of EC Regulation No. 854/2004 on the adequacy of
human resources and staffing of official control activities, with particular reference to inspection
in slaughterhouses
Clustering and relaxation in long range Hamiltonian dynamics
No full textWe study the dynamics of a fully coupled network of N classical rotators, which can also be viewed as a mean-field XY Heisenberg (HMF) model, in the attractive (ferromagnetic) and repulsive (antiferromagnetic) cases. The exact free energy and the spectral properties of a Vlasov-Poisson equation give hints on the values of dynamical observables and on time relaxation properties. At high energy (high temperature T) the system relaxes to Maxwellian equilibrium with vanishing magnetization, but the relaxation time to the equilibrium momentum distribution diverges with N as NT2 in the ferromagnetic case and as NT3/2 in the antiferromagnetic case. The N dependence of the relaxation time is suggested by an analogy of the HMF model with gravitational and charged sheets dynamics in one dimension, and is verified in numerical simulations. Below the critical temperature the ferromagnetic HMF model shows a collective phenomenon where the rotators form a drifting cluster; we argue that the drifting speed vanishes as N--1/2 but increases as one approaches the critical point (a manifestation of critical slowing down). For the antiferromagnetic HMF model a two-cluster drifting state with zero magnetization forms spontaneously at very small temperatures; at larger temperatures an initial density modulation produces this state, which relaxes very slowly. This suggests the possibility of exciting magnetized states in a mean-held antiferromagnetic system
Opinion de M. l'abbé de Bonneval sur le décret à rendre pour le rétablissement de la tranquillité publique, annexée à la séance du 22 février 1790
No full textRuffo de Bonneval Sixte Louis Constant. Opinion de M. l'abbé de Bonneval sur le décret à rendre pour le rétablissement de la tranquillité publique, annexée à la séance du 22 février 1790. In: Archives Parlementaires de 1787 à 1860 - Première série (1787-1799) Tome XI - Du 24 décembre 1789 au 1er mars 1790. Paris : Librairie Administrative P. Dupont, 1880. pp. 674-676
Chaos suppression in the large size limit for long-range systems
No full textWe consider the class of long-range Hamiltonian systems first introduced by Anteneodo and Tsallis and called the alpha -XY model. This involves N classical rotators on a d-dimensional periodic lattice interacting all to all with an attractive coupling whose strength decays as r(-alpha), r being the distance between sites. Using a recent geometrical approach, we estimate for any d-dimensional lattice the scaling of the largest Lyapunov exponent (LLE) with N, as a function of a in the large energy regime where rotators behave almost freely. We find that the LLE vanishes as N-kappa, with kappa = 1/3 for 0 less than or equal to alpha /d less than or equal to 1/2 and kappa = 2/3(1 - alpha /d) for 1/2 less than or equal to alpha /d < 1. These analytical results present a nice agreement with numerical results obtained by Campa et al, including deviations at small N
Opinion de M. l'abbé de Bonneval sur le rapport du comité des dîmes, en annexe de la séance du 14 avril 1790
No full textRuffo de Bonneval Sixte Louis Constant. Opinion de M. l'abbé de Bonneval sur le rapport du comité des dîmes, en annexe de la séance du 14 avril 1790. In: Archives Parlementaires de 1787 à 1860 - Première série (1787-1799) Tome XIII - Du 14 avril au 21 avril 1790. Paris : Librairie Administrative P. Dupont, 1882. pp. 30-37
On the properties of the Lambda value at risk: robustness, elicitability and consistency
No full textRecently, the financial industry and regulators have enhanced the debate on the good properties of a risk measure. A fundamental issue is the evaluation of the quality of a risk estimation. On the one hand, a backtesting procedure is desirable for assessing the accuracy of such an estimation and this can be naturally achieved by elicitable risk measures. For the same objective, an alternative approach has been introduced by Davis [Stat. Risk Model. Appl. Finance Insurance, 2016, 33, 67–93] through the so-called consistency property. On the other hand, a risk estimation should be less sensitive with respect to small changes in the available data-set and exhibit qualitative robustness. A new risk measure, the Lambda value at risk (), has been recently proposed by Frittelli et al. [Math. Finance, 2014, 24, 442–463], as a generalization of VaR with the ability to discriminate the risk among P&L distributions with different tail behaviour. In this article, we show that also satisfies the properties of robustness, elicitability and consistency under some conditions
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