[en] It is shown that a bosonic formulation of the double-exchange model, one of the classical models for magnetism, generates dynamically a gauge-invariant phase in a finite region of the phase diagram. We use analytical methods, Monte Carlo simulations and finite-size scaling analysis. We study the transition line between that region and the paramagnetic phase. The numerical results show that this transition line belongs to the universality class of the antiferromagnetic RP² model. The fact that one can define a universality class for the antiferromagnetic RP² model, different from the one of the O(N) models, is puzzling and somehow contradicts naive expectations about universality

[en] Many parameters related to the plasma spraying process and to the substrate surface properties control the quality of plasma sprayed coating; Current studies have pointed out the fact that a preliminary oxidation, in case of metallic surfaces, enhances really the adhesion of the deposits. This oxidation is achieved by the plume of the plasma jet during a time tp at the estimated surface temperature conditions and also for given initial surface preparations. In order to understand the influence of these different surface states to their plasma oxidation behaviour. Oxide layers, metallic bulk and oxide-metal interfaces have been investigated using different spectroscopic techniques, like XRD, CEMS and near ultraviolet-visible-near infrared spectroscopy. (authors)

[en] We present a new VLSI integer scalar processor, intended to be used primarily as the controller of the APE100 massively parallel processor. Its open and flexible architecture indicates a potential for use in other HEP applications, such as front-end processing or data readout. (orig.)

[en] We present the most recent APE result about hadronic mass spectrum in the quenched framework, using both Wilson and staggered fermions on a 24³x32 lattice at β=6.0. We also discuss the numerical determination of scattering lengths. (orig.)

[en] We discuss the most recent quenched hadron mass spectrum results from the Ape Collaboration. We discuss Wilson and staggered fermions, and we underline our efforts toward small quark masses, and the most serious problems we encountered. (orig.)

[en] We discuss the Ape Collaboration recent results for the Wilson fermions hadronic mass spectrum at β=6.0 on a 24³x32 lattice. Some of the main new points are the results for the nucleon σ term and the estimates for excited states. (orig.)

[en] We discuss the Ape Collaboration results for the hadronic mass spectrum obtained in the staggered fermion formulation at β=6.0 on a 24³x32 lattice. We underscore the good features that are coming out at higher β values, as for example the value of the σ term, the status of flavor symmetry and the relation with Wilson fermion discretization. (orig.)

[en] We study the pure gauge deconfining phase transition. We introduce the general theoretical framework of the problem, and we analyze our numerical results. We comment on the physical relevance of our findings. (orig.)

[en] We study staggered quenched QCD at a moderate value of β on a large lattices. We introduce smeared Green functions for staggered fermions, and we analyze their effectiveness. We estimate the lattice spacing, and establish that staggered fermions undergo large systematic errors at low β in the estimate of the lattice spacing from the ρ-mass. The scale ratio of the baryonic and the mesonic sector (m_P/m_ρ) is, on the contrary, consistent with the one estimated by using Wilson fermions. Owing to the use of smeared operators on large lattices (up to 24³x32), we are able to give reliable results for the baryonic states. (orig.)

[en] I report on the recent work done by the Ape Collaboration. (orig.)