Macchine da pressofusione Vacural Müller Weingarten

In questo articolo viene presentata una panoramica della macchina da pressocolata tipo “Vacural”prodotta dall’azienda tedesca Müller Weingarten. Questo tipo di impianto è stato inventato per produrregetti di pressocolati con alto vuoto: con questa tecnologia vengono eliminate le porosità all’interno deigetti. Le macchine da presso colata Vacural sono in uso in molte aziende che lavorano in particolare nelsettore dell’automotive. Una delle più importanti applicazioni degli impianti Vacural è nello stampaggiodello “space frame” di alcune autovetture

Model based control for multi-cloud applications

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Operating Regimes of GaAs-AlGaAs Semiconductor Ring Lasers: Experiment and Model

Abstract-Theory and experiments of single-mode ridge waveguide GaAs-AlGaAs semiconductor ring lasers are presented. The lasers are found to operate bidirectionally up to twice the threshold, where unidirectional operation starts. Bidirectional operation reveals that just above threshold, the lasers operate in a regime where the two counterpropagating modes are continuous wave. As the injected current is increased, a new regime appears where the intensities of the two counterpropagating modes undergo alternate sinusoidal oscillations with frequency in the tens of megahertz range. The regime with alternate oscillations was previously observed in ring lasers of the gas and dye type, and it is here reported and investigated in semiconductor ring lasers. A theoretical model based on a mean field approach for the two counterpropagating modes is proposed to study the semiconductor ring laser dynamics. Numerical results are in agreement with the regime sequence experimentally observed when the injected current is increased (i.e., bidirectional continuous-wave, bidirectional with alternate oscillations, unidirectional). The boundaries of the different regimes are studied as a function of the relevant parameters, which turn out to be the pump current and the conservative and dissipative scattering coefficients, responsible for an explicit linear coupling between the two counterpropagating field modes. By a fitting procedure, we obtain good numerical agreement between experiment and theory, and also an estimation for the otherwise unknown scattering parameters

LE INFEZIONI IN ONCOLOGIA GINECOLOGICA

3TERAPIE PALLATIEVE IN ONCOLOGIA GINECOLOGICAnoneFRANCHI M; GHEZZI F.; MIGLIERINA MFranchi, M; Ghezzi, Fabio; Miglierina, M

Le infezioni in Oncologia Ginecologica.

Le infezioni in Oncologia Ginecologic

Critical point index for vector functions and vector optimization

In this work, we study the critical points of vector functions from R^n to R^m with n 65 m, following the definition introduced by Smale in the context of vector optimization. The local monotonicity properties of a vector function around a critical point which are invariant with respect to local coordinate changes are considered. We propose a classification of critical points through the introduction of a generalized Morse index for a critical point, consisting of a triplet of nonnegative integers. The proposed index is based on the sign of an appropriate invariant vector-valued second order differential