Understanding the Potential Impact of Multiple Robots in Odor Source Localization

We investigate the performance of three bio-inspired odor source localization algorithms used in non-cooperating multi-robot systems. Our performance metric is the distance overhead of the first robot to reach the source, which is a good measure for the speed of an odor source localization algorithm. Using the performance distribution of single-robot experiments, we calculate an ideal performance for multi-robot teams. We carry out simulations in a realistic robotic simulator and provide quantitative evidence of the differences between ideal and realistic performances of a given algorithm. A closer analysis of the results show that these differences are mainly due to physical interference among robots

Transfert de moment angulaire dans les collisions très inélastiques entre ions lourds

Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe

Transfert de moment angulaire dans les collisions très inélastiques entre ions lourds

Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe

Influence of Coulomb and nuclear forces on the pattern of the double differential cross section d2σd θdE for deep inelastic reactions

The tremendous change in the pattern of the Wilczynski curves for deep inelastic reactions with the product Z1Z2 is interpreted within a model including both dissipation and statistical fluctuations. The competition between Coulomb and nuclear forces seems to account for this effect. NUCLEAR REACTIONS Calculation of double differential cross sections d2σd θdE for deep inelastic reactions. © 1978 The American Physical Society.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Fusion and deep inelastic collisions studied on the Ar + Au system - I. Influence of the bombarding energy

We investigated the Ar + Au system at two different bombarding energies 201 and 248 MeV. The mass and the energy of the products have been measured at different angles. Mass distributions exhibits two components separated at the low bombarding energy and partly merging into each other at the high bombarding energy. One of them can be attributed to fission following complete fusion, the other one is centered around mass 40 and corresponds to deep inelastic products. These two different mechanisms correspond to different time scales. Angular distributions d2σ/dθdM are peaked a little bit forward the grazing angle for products close to the projectile and, when the mass transfer increases, becomes constant. For deep inelastic collisions the mass transfer occurs in the way predicted using potential energy considerations, but the small FWHM and the slight shift of the position of the maximum of these distributions indicates a short contact time. Due to the increase of the temperature, the FWHM of the mass distribution of deep inelastic products increases with the bombarding energy. The mean total kinetic energy studied as a function of the detection angle shows the influence of statistical fluctuations at backward angles. One also observes for this system that the relaxation time connected with the mass asymmetry degree of freedom is larger than the one associated to the energy damping. Complete fusion cross sections measurements were also done at 183, 189 and 195 MeV which allowed to draw the excitation function for this process. Calculations of the fusion cross section using the concept of critical distance are in agreement with the data. © 1977 Springer-Verlag.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Quasi-fission mass distributions as a random walk process. The 63Cu+197Au system

The quasi-fission mass distributions have been measured at 365 and 443 MeV lab bombarding energy. Assuming a Markov process, a Fokker-Planck equation has been derived, the coefficient of which have been calculated using an analogy with the classical theory of Brownian motion. These coefficients have been shown to be energy dependent and they have been expressed in terms of a correlation function calculated in an equilibrium situation. This model has been successfully applied to the Cu+Au system at two different bombarding energies. © 1976.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Neutron-multiplicity in deep inelastic collisions: 365 MeV Cu+Au system

Neutrons have been detected in coincidence with the two outgoing fragments in deep inelastic reactions of63Cu on197Au at 365 MeV. Most of these neutrons are evapored from the fully accelerated fragments. An additionnal low energy contribution appears. © 1977 Springer-Verlag.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

A possible mechanism in heavy ion induced reactions: "Fast fission process"

The influence of the orbital angular momentum l on the mass distribution of fission fragments is studied, both on previously available data on heavy ion induced fission and in new specifically planned experiments: systems40Ar+165Ho and24Mg+181Ta at bombarding energies ranging from 180 up to 391 MeV and leading to the same fissioning nucleus205At with different l distributions. When l values corresponding to a vanished fission barrier are reached, the mass distribution broadens. This suggest the existence of a specific process, "fast fission", at l-values intermediate between l-values leading to compound nucleus formation and deep inelastic collisions, respectively. This process and its conditions of occurence are discussed; of special interest are the correlated differences between the limitations to the fusion cross-section and the fission mass distributions broadenings, respectively, for the Ar+Ho and Mg+Ta systems. © 1981 Springer-Verlag.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Angular momentum transfer in deep inelastic collisions for the Ar+Au and Cu+Au systems

This paper concerns γ-ray multiplicity experiments performed on three systems: Ar+Au at 227 MeV, Cu+Au at 365 and 443 MeV. The Ar+Au system has been chosen because both quasifission and fission following complete fusion processes can be distinguished. Moreover, the angular momentum window associated with quasi-fission is narrow. Inversely, in the Cu + Au case most of the cross section corresponds to quasi-fission. The absolute multiplicity values measured are used to test whether or not the rolling or the sticking stages are reached. It is found that the answer depends on the system, the fragment detection angle and the incoming beam energy. Comparisons with the predictions of various models are presented. No model explains all the results. The influence of mass and kinetic energy transfers on the multiplicity values are widely discussed. Finally, it is shown that it is impossible to explain all the data without assuming that some collective modes induced during the process are responsible for some additional angular momentum observed in the fragments. © 1979.SCOPUS: ar.jinfo:eu-repo/semantics/publishe