IRIS - UNIRSM (Univ. degli Studi della Repubblica di San Marino)
Not a member yet
2115 research outputs found
Sort by
Prisoners of War (Italy)
Get PDFIn the first part of the article, the salient features of the experiences of the Italian prisoners of war are highlighted: the high number of soldiers captured and the high number of deaths among the prisoners. Then consideration is given to the suffering they endured in the prison camps, and the causes that led to such a high mortality among their ranks. The second part presents a series of data on the number of foreign soldiers who were prisoners in Italy, the number of deaths, their distribution with respect to the concentration points and areas of employment. Then there is a description of the episode of the Austro-Hungarian prisoners who, in December 1915, were transferred from Serbia to Italy
Intelligent Algorithms for Warehouse Management
No full textWarehouses are important links in the supply chain; here, products are temporarily stored and retrieved subsequently from storage locations to fulfill customer’ orders. The order picking activity is one of the most time-consuming processes of a warehouse and is estimated to contribute for more than 55 % of the total cost of warehouse operations. Accordingly, scientists, as well as logistics managers, consider order picking as one of the most promising area for productivity improvements. This chapter is intended to provide the reader with an overview of different intelligent tools applicable to the issue of picking optimization.
Specifically, by this chapter, we show how different types of intelligent algorithms can be used to optimize order picking operations in a warehouse, by decreasing the travel distance (and thus time) of pickers. The set of intelligent algorithms analyzed include: genetic algorithms, artificial neural networks, simulated annealing, ant colony optimization and particles swarm optimization models. For each intelligent algorithm, we start with a brief theoretical overview. Then, based on the available literature, we show how the algorithm can be implemented for the optimization of order picking operations. The expected pros and cons of each algorithm are also discussed
Favole e politica. Pinocchio, Cappuccetto rosso e la Guerra fredda
No full textLa favola ricorda
Un lupo americano
Una bestiaccia ingorda
Che mangia a tutto spiano.
De Gasperi col naso lungo che racconta bugie agli italiani, Togliatti nelle vesti del lupo cattivo, Truman e Stalin nei panni dell’orco. E, ancora, Pinocchio che indossa la divisa da balilla, poi milita nelle file dei comunisti, sotto le insegne della Democrazia cristiana o in quelle della socialdemocrazia.
Si tratta di ruoli fantastici che non rientrano in alcuna classificazione letteraria, ma rispondono piuttosto alla necessità di una propaganda che si situa ai gradini più bassi della comunicazione politica. O prendendo strumentalmente a prestito luoghi situazioni e personaggi del mondo favolistico; o inventando leggende attorno a personaggi e situazioni reali facendogli assumere contorni fiabeschi.
Si tratta di un genere che non ha nulla da condividere con raffinate storie come quelle di Pierino e il lupo, la fiaba musicale di Sergej Prokof'ev, vera e propria metafora della politica, e che non rientrano neppure nella classificazione proposta da Vladimir Propp in Morfologia della fiaba.
Subordinata alla affermazione di una idea o di un principio la favola politica mescola strumentalmente satira e fiabe tradizionali, racconti fantastici e leggende, zoologia politica e stravolgimento di fatti reali, miracolistica e profezie dando origine a una e vera propria infantilizzazione del racconto politico in grado di suggestionare l’immaginario, non solo infantile, negli anni della guerra fredda
La sicurezza sul lavoro nella galassia delle società di capitali
No full textSi tratta degli Atti del Convegno di Studi svoltosi ad Urbino il 14 novembre 201
Structural Mechanics Applications using Strong Formulation Finite Element Method
No full textMany practical applications in civil, mechanical and aerospace engineering are difficult to perform and analyze due to the presence of irregular geometries, different or graded materials, as well as cracks, curved boundaries and load discontinuities [1-2]. These problems can be solved by dividing the physical domain into finite elements, as the well-known Finite Element Method (FEM) does. With regard to a new numerical approach, termed Strong Formulation Finite Element Method (SFEM), inside each element a higher order numerical scheme, such as Differential Quadrature (DQ) method, is used for solving the governing equations in their strong form [3-7]. The SFEM approach combines the two DQ and FEM techniques to obtain a hybrid scheme. The former method is used to discretize the differential equations inside each element, the latter for the mapping technique. It should be noted that the SFEM is a numerical procedure that subdivides the domain in several elements and solves the strong form of the differential equations inside each subdomain mapped on the computational element. Several numerical applications are performed to demonstrate convergence, reliability and stability of the SFEM. In particular, both one-dimensional and two-dimensional structural systems are investigated. All the numerical results are compared to analytical and semi-analytical solutions found in literature and to the values obtained through FE modeling
"Dentro" e "fuori" la scuola
No full textLa proposta di laboratorio di educazione ambientale, articolata nella due dimensioni del dentro e del fuori scuola, aderisce ad un modello culturale e formativo problematico, in quanto tendente a salvaguardare/valorizzare in un intreccio dialettico diversi punti di vista
Static and Dynamic Analyses of Doubly-Curved Composite Thick Shells with Variable Radii of Curvatures
No full textShell structures have an important role in many engineering fields. A shell is a 3D solid that can be studied with the classical theory of elasticity. Some simplifications have to be introduced to reduce the computational cost. There are three different ways to deal with anisotropic shell structures: 3D elasticity, Equivalent Single Layer (ESL) and Layer Wise (LW) approaches. The last two theories have their own roots in the Carrera Unified Formulation (CUF), which is capable of studying several higher-order displacement fields taking the kinematic expansion order as a free parameter for the representation of any higher order formulation [1-4]. These theoretical models allow to consider variable mechanical properties on the shell surface and variable thickness. The geometric description of the shells is carried out using differential geometry. Thus, the geometry of the structure is described mathematically through certain predefined parameters that depend on the geometry under consideration. In this study innovative materials, such as Functionally Graded (FG) and Carbon Nanotube (CNT) reinforced composites, are investigated. Moreover, a new class of fiber reinforced laminated composites defined by a curvilinear path of the fibers is examined. The so-called Variable Angle Tow (VAT) placement permits to design composite structures with the desired stiffness. Different loads are taken into account. Several surface load distributions, the effect of the Winkler-Pasternak foundation, seismic actions, as well as concentrated forces, can be included in the proposed approach. The mathematical problem, governed by a partial differential system of equations, is solved using a strong formulation approach, named Generalized Differential Quadrature (GDQ) method [1-4]. Both the free vibration analysis and the static analysis with the recovery procedures for estimating strains and stresses at each point of the 3D solid shells, are worked out. Several applications and numerical results to exhibit the accuracy of the present technique are shown
Sulle tracce della memoria : guida escursionistica e cartina del territorio : turismo, storia e cultura lungo le tracce della seconda guerra mondiale : itinerario cicloturistico
No full textThe Strong Formulation Finite Element Method Applied to Structural Mechanics Problems
No full textThe Strong Formulation Finite Element Method (SFEM) [1] is a numerical approach that can be used for solving civil, environmental, mechanical, aerospace and naval engineering problems. Generally, practical engineering problems are complex due to geometry, material and load discontinuities. For solving them, it is necessary to divide the whole domain into nite elements of arbitrary shape. The mapping technique is introduced at this level to transform an arbitrarily shaped element to a parent element (computational element). The classic Finite Element Method (FEM) uses the above procedure and the problem at the parent element level is solved by means of weak (variational) formulation. On the contrary, the SFEM summarises a class of methods that is able to approximate total and partial derivatives at discrete points, thus the solution is found in its strong form. The SFEM has its own roots in the Dierential Quadrature Method (DQM), which was introduced in the early 1970s. Nevertheless, DQM does not allow to treat arbitrarily shaped domains and problems where discontinuities are present. These features are proper of nite element approaches, in which the global domain is divided into several smaller elements, and after the assembly procedure they solve the complete system. Therefore the SFEM is an hybrid scheme given by the DQM and the FEM. The most signicant dierence between these two methodologies lays on the formulation used for solving the parent element. In order to clarify the idea about the fact that the SFEM comprehends several numerical techniques, the reader can review a class of methods in the article [2], where it has been claried that the most important and wide-spread numerical approaches are a sub-class of the method of weighted residuals. Moreover a former review article about DQM can be found in [3] where a state of the art of that time was given. Unfortunately the authors limited their analysis to DQM and they did not focus their attention on the generalization of the DQM concepts to a wider prospective. As far as the authors are concerned, the rst paper regarding the present topic was presented in [4]. The discussion was extended in a survey paper published recently [5], where a signicant historical review about strong and weak numerical tools was carried out. The authors provided stability and accuracy of one-dimensional and two-dimensional problems when compared to classic exact solutions related to structural problems, such as rods, beams, membranes and plates. The rst application of the SFEM regarding one-dimensional in-plane multi-stepped and multi-damaged arches was published in [6]. The authors investigated the vibration of thin membranes in a review paper [7], where several well-known numerical applications were compared to the literature. Some other applications were presented concerning the behavior of elastostatic and elastodynamic plane structures in [8, 9, 10, 11]. Later the authors presented the SFEM applied to the modal analysis of Reissner-Mindlin plates [12, 13]. The SFEM based on DQM and Radial Basis Function (RBF) method has been presented in the work [14]. Finally in the works [15, 16] a particular emphasis has been given to the stress recovery procedure for the evaluation of the three dimensional strain and stresses at all the physical points of the problem. As a denition the SFEM is a numerical procedure that decomposes the physical domain or problem in nite elements and used the strong formulation inside each element mapped on the parent (or computational) element. When in the above procedure the weak formulation is used (instead of the strong form), the WFEM is dened. The latter is well-known in literature as FEM. This paper aims to investigate the application of the SFEM to structural mechanics problems. Since its numerical solutions depend on the number of collocation points, the basis functions used, the location of the points and the number of domain divisions, the authors report in graphical form the stability, accuracy and reliability of the present technique. In this way several aspects are raised and remarks are given as closure