1,721,058 research outputs found
Still believe it? an analysis of partnership trajectories after first union dissolution in Italy
Full text linkWe examine the patterns of partnership behaviour following first union dissolution analysing the individual union histories from the Survey “Families, Social Subjects and Life Cycle”, carried out by Istat in 2016. The aim of the work is to analyse the frequency and characteristics of re-partnering, and to explore the role of LAT (Living Apart Together) as an alternative for those who form a new union without cohabitation. The Risk of entering a second union by time elapsed since first union dissolution has been estimated with a Cox proportional-hazards model. Then, we selected individuals who entered a second union and applied multivariate logistic models to analyse factors associated with the likelihood to enter a certain partnership form (marriage, informal cohabitation, or LAT) rather than another. More than one third of those who dissolved the first union engaged in a new partnership. Male partners, living in the North, with low-medium level of education, with no children and exiting from a first consensual union show the highest risk to form a new union. LAT proves to be an alternative to a new cohabiting union (marriage or informal). The odds of choosing this new form of union increase with the younger cohort, those with children and with strong family support. Among those who enter a second cohabiting union, marriage is generally chosen by the already married and informal partnership among those who experienced the same living arrangement
Multibody modeling of railway vehicles: Innovative algorithms forthe detection of wheel-rail contact points
No full textThe multibody simulation of railway dynamics needs a reliable and efficient method to properly describe the contact between wheel and rail. In this work innovative methods to evaluate the position of contact points are presented. The aim is to develop a method which can be implemented on-line, assuring a calculation time consistent with real-time calculations of multibody dynamics. At the same time it has to be very accurate, to properly predict the local forces at contact in order to describe even the wear of contact surfaces. In this work the authors present two different approaches to find stationary points during a multibody simulation. In the former the conditions to define a local minima are wrote in an analytical way. This makes possible to combine the conditions in order to reduce the analytic problem's dimension and then to solve numerically the problem with a low computational burden. The latter approach calculates the location of local minima using a method based on neural networks. The paper will cover the details of the proposed methods and the performances, in terms of computation time and accuracy, will be compared with those of the conventional algorithms used by commercial softwares, showing their reliability and low computational burden. Moreover, an implementation of the proposed models in a multibody simulator will be presented, in order to show their suitability for this application. © 2010 Elsevier B.V
Da un fotogramma di Méliès a una tela di Crowe. Immagini in assenza di luce tra artificio, mito, rivelazione.
No full textRicopertura flessibile di pavimentazioni aeroportuali in calcestruzzo con sistemi “antirichiamo lesioni”. Sei anni di esperienza nell’aeroporto militare di Pratica di Mare
No full textDevelopment and implementation of a differential elastic wheel-railcontact model for multibody applications
No full textThe wheel-rail contact analysis plays a fundamental role in the multibody modelling of railway vehicles. A good contact model must provide an accurate description of the global and local contact phenomena (contact forces, position and shape of the contact patch, stresses and displacements) and a general handling of the multiple contact. The model has also to assure high numerical efficiency (in order to be implemented directly online within multibody models) and a good compatibility with commercial multibody software (Simpack Rail, Adams Rail). In this work, an elastic wheel-rail contact model that satisfies the previous specifics is presented. The model considers the wheel and the rail as elastic deformable bodies and requires the numerical solution of Navier's elasticity equation. The contact between wheel and rail has been described by means of suitable analytical contact conditions. Subsequently, the contact model has been inserted within the multibody model of a benchmark railway vehicle (the Manchester Wagon) in order to obtain a complete model of the wagon. The model has been implemented in the Matlab/Simulink environment. Finally, numerical simulations of the vehicle dynamics have been carried out on many different railway tracks with the aim of evaluating the performances of the model. The results obtained with the proposed method have been compared with those obtained by means of a standard commercial software. The main purpose is to achieve a better integration between the differential modelling and the multibody modelling. This kind of integration is almost absent in the literature (especially in the railway field) due to the computational cost and to the memory storage needs. However, it is very important because only the differential modelling allows an accurate analysis of the contact problem (in terms of contact forces, position and shape of the contact patch, stresses and displacements) while the multibody modelling is currently the standard in the study of the railway dynamics. © 2011 Taylor & Francis
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Quel che c'è di profondo nell'umano è la pelle. Tattilità nel cinema di Bergman
No full textScene da un matrimonio, Sarabanda, Persona e Sussurri e grida sono i film di Bergman in cui vengono analizzati momenti particolarmente significativi rispetto al tema della tattilità , visto quale superamento della distanza fisica e della freddezza affettiva che contraddistingue i personaggi nel cinema del grande Maestro. In particolare l’uso espressivo del primo piano della mano concorre a costruire una cartografia dei corpi che vede nell’insistenza figurativa della tattilità e del generarsi di un fugace contatto un modo per superare la barriera difensiva eretta dalle singole esistenze
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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