Would Declining Exit Rates from Welfare Provide Evidence of Welfare Dependence in Homogeneous Environments?

Negative duration dependence in the exit rate from social assistance is an important issue addressed in the dynamic welfare participation literature. If heterogeneity is properly modelled, the decline of the exit rate is ascribed to a progressive reduction of the capability to get off welfare due to the detrimental effects of the benefit as time in welfare increases (Blank, 1989; Sandefur and Cook, 1998; Dahl and Lorenzen; 2003; Gangl, 2003, Chay et al, 2005). The aim of this paper is to show that the potential corruptive effects of benefits are not easily identified with this analytical strategy. As a starting point we develop a model, coherent with the Bane and Ellwood (1994) theoretical framework, that describes the causal links occurring between work/unemployment, poverty and social assistance. A simulation study is carried out in order to show that negative duration dependence in the exit rate from welfare may arise in environments where no corruptive effects of benefits are at work, even in the absence of heterogeneity at the onset of the process. Thus, negative duration dependence in the exit rate from welfare does not imply ‘welfare dependence’: the observed pattern may be due to effects of persistence in poverty or in unemployment.

Leonardo PARRI, Explanation in the Social Sciences. A Theoretical and Empirical Introduction

The aim of Leonardo Parri’s book is “the revitalization” (p.10) of the concept of social law. However, his support of the indispensability of social laws in order to explain social facts doesn’t imply that the standard model should be that of the hard natural sciences (ch.6). One has instead to turn towards soft natural sciences, like geology, climatology, etc., which deal statistically with high complexity phenomena. Let me consider the author’s arguments. In the first three chapters, Parri ..

AFM Dissipation Topography of Soliton Superstructures in Adsorbed Overlayers

In the atomic force microscope, the nanoscale force topography of even complex surface superstructures is extracted by the changing vibration frequency of a scanning tip. An alternative dissipation topography with similar or even better contrast has been demonstrated recently by mapping the (x,y)-dependent tip damping but the detailed damping mechanism is still unknown. Here we identify two different tip dissipation mechanisms: local mechanical softness and hysteresis. Motivated by recent data, we describe both of them in a onedimensional model of Moire' superstructures of incommensurate overlayers. Local softness at "soliton" defects yields a dissipation contrast that can be much larger than the corresponding density or corrugation contrast. At realistically low vibration frequencies, however, a much stronger and more effective dissipation is caused by the tip-induced nonlinear jumping of the soliton, naturally developing bistability and hysteresis. Signatures of this mechanism are proposed for experimental identification.Comment: 5 pages, 5 figures, Phys Rev B 81, 045417 (2010

From individual choice to collective voice. Foundational economy, local commons and citizenship

none3noUnder what conditions and by which mechanisms do the defence and mana- gement of local commons open new spaces for the recovery of a universalistic model of citizenship, after the crisis of welfare capitalism regimes? To deal with this question we propose first to frame local commons within the range of Foundational Economy, namely the «civic infrastructure» of mundane goods and services that serve daily-life needs. We then discuss some analytical risks of the customary approach to local commons, arguing that the Foundational Economy approach may help to overcome them. Finally, we illustrate several cases of collective effort that support both the defence and the management of local commons. These cases are grounded in collective action and voice in support of a new universalistic model of citizenship where ritual social practices, legal rights and responsibilities are intertwined.mixedBarbera, Filippo; Negri, Nicola; Salento, AngeloBarbera, Filippo; Negri, Nicola; Salento, Angel

Uniform labelled calculi for preferential conditional logics based on neighbourhood semantics

International audienceThe preferential conditional logic PCL, introduced by Burgess, and its extensions are studied. First, a natural semantics based on neighbourhood models, which generalise Lewis' sphere models for counterfactual logics, is proposed. Soundness and completeness of PCL and its extensions with respect to this class of models are proved directly. Labelled sequent calculi for all logics of the family are then introduced. The cal-culi are modular and have standard proof-theoretical properties, the most important of which is admissibility of cut, that entails a syntactic proof of completeness of the calculi. By adopting a general strategy, root-first proof search terminates, thereby providing a decision procedure for PCL and its extensions. Finally, the semantic completeness of the calculi is established: from a finite branch in a failed proof attempt it is possible to extract a finite countermodel of the root sequent. The latter result gives a constructive proof of the finite model property of all the logics considered

Leonardo PARRI, Explanation in the Social Sciences. A Theoretical and Empirical Introduction

The aim of Leonardo Parri’s book is “the revitalization” (p.10) of the concept of social law. However, his support of the indispensability of social laws in order to explain social facts doesn’t imply that the standard model should be that of the hard natural sciences (ch.6). One has instead to turn towards soft natural sciences, like geology, climatology, etc., which deal statistically with high complexity phenomena. Let me consider the author’s arguments. In the first three chapters, Parri ..

eSCAPE: a Large-scale Synthetic Corpus for Automatic Post-Editing

Training models for the automatic correction of machine-translated text usually relies on data consisting of (source, MT, human post- edit) triplets providing, for each source sentence, examples of translation errors with the corresponding corrections made by a human post-editor. Ideally, a large amount of data of this kind should allow the model to learn reliable correction patterns and effectively apply them at test stage on unseen (source, MT) pairs. In practice, however, their limited availability calls for solutions that also integrate in the training process other sources of knowledge. Along this direction, state-of-the-art results have been recently achieved by systems that, in addition to a limited amount of available training data, exploit artificial corpora that approximate elements of the "gold" training instances with automatic translations. Following this idea, we present eSCAPE, the largest freely-available Synthetic Corpus for Automatic Post-Editing released so far. eSCAPE consists of millions of entries in which the MT element of the training triplets has been obtained by translating the source side of publicly-available parallel corpora, and using the target side as an artificial human post-edit. Translations are obtained both with phrase-based and neural models. For each MT paradigm, eSCAPE contains 7.2 million triplets for English-German and 3.3 millions for English-Italian, resulting in a total of 14,4 and 6,6 million instances respectively. The usefulness of eSCAPE is proved through experiments in a general-domain scenario, the most challenging one for automatic post-editing. For both language directions, the models trained on our artificial data always improve MT quality with statistically significant gains. The current version of eSCAPE can be freely downloaded from: http://hltshare.fbk.eu/QT21/eSCAPE.html.Comment: Accepted at LREC 201

Design of a Multi-Mode Hybrid Micro-Gripper for Surface Mount Technology Component Assembly

In the last few decades, industrial sectors such as smart manufacturing and aerospace have rapidly developed, contributing to the increase in production of more complex electronic boards based on SMT (Surface Mount Technology). The assembly phases in manufacturing these electronic products require the availability of technological solutions able to deal with many heterogeneous products and components. The small batch production and pre-production are often executed manually or with semi-automated stations. The commercial automated machines currently available offer high performance, but they are highly rigid. Therefore, a great effort is needed to obtain machines and devices with improved reconfigurability and flexibility for minimizing the set-up time and processing the high heterogeneity of components. These high-level objectives can be achieved acting in different ways. Indeed, a work station can be seen as a set of devices able to interact and cooperate to perform a specific task. Therefore, the reconfigurability of a work station can be achieved through reconfigurable and flexible devices and their hardware and software integration and control For this reason, significant efforts should be focused on the conception and development of innovative devices to cope with the continuous downscaling and increasing variety of the products in this growing field. In this context, this paper presents the design and development of a multi-mode hybrid micro-gripper devoted to manipulate and assemble a wide range of micro- and meso-SMT components with different dimensions and proprieties. It exploits two different handling technologies: the vacuum and friction