Evaluation of the magnetization direction effects on ferrite PM brushless fractional machines

Permanent magnets are frequently adopted in small brushless machines for automotive applications. Normally anisotropic ferrites, but some research on bonded magnets is being carried on. Several types of magnetization can be proposed, involving different levels of complexity in the magnetization process. In the paper a comparison between parallel and radial magnetization is described, taking into account on one side the major complexity of the radial process and on the other the small power derating of the paralle

PM fractional machines adopting bonded magnets: effect of different magnetizations on the energetic performance

The adoption of Permanent Magnets in small brushless machines for automotive applications is becoming frequent. Some research on bonded magnets is being carried on to substitute the ferrites. In the paper the parallel and radial magnetizations are considered: the different process complexity levels are analyzed and the effects on the iron losses and the energetic performances are evaluated by means of a simulation analysis and its experimental validatio

Science of Recording

In what follows I would like to recommend the creation of a new undergraduate course, or, rather, a brand new academic program, with all its MAs, BAs, and PhD programs, dean and faculty, freshmen and freshwomen, applications, debates on newspapers, government commissions, areas of study, Erasmus programs, faculty’s impact factor, and so on. The name of such a new academic program, or undergraduate course, would be “science of recording” and it would be designed to address the new needs of our society, which, in entering the new century, has to face the challenge of a world that was mistakenly thought to be dominated by communication (and, unfortunately, by all sorts of wannabe orators) and that unexpectedly discovers itself as being dominated by recording. Don’t worry, I am just kidding. I have no such intention. My aim is just to illustrate the signi?cance of writing and recording in our world, and to point out that such a significance has been sometimes overlooked, causing perspectival mistakes that, at least in my opinion, should be corrected, and there is no better occasion to start doing it than at a conference on the “Philosophy of the Information Society”. No doubt that our society, and almost certainly every conceivable society, is a society of information: one cannot live without knowing; not even Robinson can do it. A fortiori in a complex society, one cannot live without knowing. It is often thought that that means that we live in a society of communication, both in the sense that communication is necessary for society and in the sense of an unprecedented expansion of communication in our time. I doubt both such contentions. Of course, a society must communicate in order to exist; but communication alone doesn’t suf?ce. Indeed it seems a function that is subordinated to something more essential, namely recording. The idea I would like to sketch here is that we live in a society of recording and that this is the possibility condition of a society of communication, and, of course, of information. By saying that we are in a society of recording I just mean that if we look to all the transformations that have characterized our time we ?nd that they have mainly happened in the realm of recording and not in that of communication

L’Environmental Kuznets Curve nel Settore dei Rifiuti Solidi Urbani

This paper provides a specific application of the Environmental Kuznets Curve (EKC) theory in order to explain the correlation between income and household waste generation. The model highlights an U-shaped path of income-refuse relationship that verifies the existence of EKC depending on the effort of household recycling and consumption. The existence of delinking can derive by income and other socio economic variables that affect the shape of the curve. This model would be a particular application of the theory of delinking with the intent to be empirically implemented.Environmental Kuznets Curve, Waste Collection, Delinking, Waste policies

Noether Charges, Brown-York Quasilocal Energy and Related Topics

The Lagrangian proposed by York et al. and the covariant first order Lagrangian for General Relativity are introduced to deal with the (vacuum) gravitational field on a reference background. The two Lagrangians are compared and we show that the first one can be obtained from the latter under suitable hypotheses. The induced variational principles are also compared and discussed. A conditioned correspondence among Noether conserved quantities, quasilocal energy and the standard Hamiltonian obtained by 3+1 decomposition is also established. As a result, it turns out that the covariant first order Lagrangian is better suited whenever a reference background field has to be taken into account, as it is commonly accepted when dealing with conserved quantities in non-asymptotically flat spacetimes. As a further advantage of the use of a covariant first order Lagrangian, we show that all the quantities computed are manifestly covariant, as it is appropriate in General Relativity.Comment: 43 pages, 3 figures, PlainTeX fil

Universality of Einstein Equations for the Ricci Squared Lagrangians

It has been recently shown that, in the first order (Palatini) formalism, there is universality of Einstein equations and Komar energy-momentum complex, in the sense that for a generic nonlinear Lagrangian depending only on the scalar curvature of a metric and a torsionless connection one always gets Einstein equations and Komar's expression for the energy-momentum complex. In this paper a similar analysis (also in the framework of the first order formalism) is performed for all nonlinear Lagrangians depending on the (symmetrized) Ricci square invariant. The main result is that the universality of Einstein equations and Komar energy-momentum complex also extends to this case (modulo a conformal transformation of the metric).Comment: 21 pages, Late

Caroline Ferraris-Besso, Assistant Professor of French

In this first column of the spring semester, Caroline Ferraris-Besso, Assistant Professor of French, shares which recent novel made her laugh out loud, her favorite cookbooks (and favorite brioche recipe!), and works that have inspired her academic writing

Waiting Times in Simulated Stock Markets

Exploiting a precise reproduction of a stock exchange, the robustness of the Continuous Double Auction (CDA) mechanism, evaluated by means of the waiting time distributions, has been proved versus 36 different set ups made by varying both the operators' behaviour and the market micro structure. The obtained results demonstrate that the CDA remains able to clear strongly different order flows, though the Milan stock exchange seemed to be a little more efficient than the NYSE under the allocative point of view, witnessing the intrinsic complexity of the stock market. The simulation has been built as an Agent Based Model in order to obtain a plausible order flow. The decisions of single agents and their interaction through the market book are realistic and reproduce some empirical analysis results. The mentioned results have been obtained either by the analysis of the complete pending time series and the same computation of the asks and bids series alone.Waiting times; Agent Based Modeling; Stock Market; Micro structures; Market Architectures