IRIS - UNIRSM (Univ. degli Studi della Repubblica di San Marino)
Not a member yet
2115 research outputs found
Sort by
Application of sinusoidal shear deformation theory and physical neutral surface to analysis of functionally graded piezoelectric plate
No full textThe concept of neutral surface for a Functionally Graded Piezoelectric (FGP) plate is developed in this paper. The electro-elastic analysis of a FGP plate resting on Winkler-Pasternak foundation is performed in the theoretical framework provided by a two-variable sinusoidal shear deformation theory, including the aforementioned concept of neutral surface. First, the location of neutral surface is defined with respect to the position of the middle surface and then the governing bending equations are derived using the principle of virtual work. An analytical method is presented to investigate the influence on the displacement and stress components of the main parameters of the model, which are volume fraction exponent of the constituents, the electric potential and foundation parameters. The numerical results are validated through the comparison with available references. The numerical results prove that the value of transverse bending deflection is greater than the corresponding shear deflection. In addition, it can be observed that the volume fraction exponent has peculiar influence on the distribution of displacements and stresses
The split pectoralis flap. Combining the benefits of pectoralis major advancement and turnover techniques in one flap
No full textSTANDARD COSTS IN PUBLIC ADMINISTRATION: THE CASE OF ITALIAN UNIVERSITIES
No full textThis paper aims to take into account the use of standard costs as a basis for the financing of public administration in the areas of health, education, municipalities and local public transport in Italy. The most common example of using standard cost accounting is represented by the public administration since standard cost accounting is the criterion for controlling public expenditure adopted by the Court of Auditors. The main principle that drives reforms on the Standard Costs in the Public Administration believes that it is more appropriate to ask for more sacrifices to those who spend more than what is necessary, its standard needs in fact. For this reason the intention of the Government is to adjust the costs of all the regions to a standard that proves to be the most virtuous in order to avoid waste that in many cases seem to be unjustified. The focus of this paper is mainly on university education, for which, in fact, the Italian Interministerial Decree No. 893 of December 9, 2014 has provided directives through which it is possible to calculate the cost that each Italian university should support for a student enrolled and ongoing with their own years of study. In light of the fact that the Ordinary Financial Fund, FFO, allocated to the Italian Universities for the year 2014 was composed of 20% on the basis of standard costs and 80% of the historical share and since the standard costs will represent 100% of the share of FFO only starting from 2018, from this study will emerge those that are the Italian universities that will be awarded with higher funding than the previous year and which are, on the contrary, those that will be more penalized. The comparison is made using the formulas provided by the decree with the data of five Italian universities with the same order of magnitude and belonging to five different Italian regions, such as: Verona, Parma, Messina, Pavia and the University of Chieti and Pescara. Finally, a further comparison is made with foreign universities, in order to point out the position in which Italy stands at world level with regard to university education in relation to gross domestic product (GDP), the number of out-of-school students and the sources of financing made available to the universities
How to easily model doubly curved shells with variable radii of curvature
No full textStudies on shells have always been a special topic in mechanics due to the complexity of their geometry. Researchers introduced the differential geometry to investigate thin shells as a general framework of a wider problem. In fact, doubly-curved shells with variable radii of curvature are not easy to model with standard tools. This work aims to present a general framework, based on the mathematical description of doubly curved thick bodies, that can mechanically solve doubly-curved shells using a fast, accurate and reliable numerical tool termed Generalized Differential Quadrature (GDQ) method. The required equations will be presented. No geometrical approximation is present (only limited to the grid points used for the GDQ meth-od). The structural theory employed in all the numerical applications is a higher order unified formulation, which can easily model any kind of first and higher order shear deformation theory for laminated composite shell structures
Sciopero 1. Ordinamento italiano
No full textLa voce ricostruisce le caratteristiche del diritto di sciopero nell'ordinamento italiano alla luce dell'art. 40 Cost. e dell'interpretazione fornitane dalla giurisprudenza e dalla dottrina
DiQuMASPAB: Differential Quadrature for Mechanics of Anisotropic Shells, Plates, Arches and Beams. User Manual.
No full textThe main aim of this book is to show the main features of DiQuMASPAB through the description of its graphical interface, by giving special emphasis to all those aspects implemented in the code. DiQuMASPAB, acronym of “Differential Quadrature for Mechanics of Anisotropic Shells, Plates, Arches and Beams”, is a computational code which can be used for the numerical analysis of doubly-curved shells made of innovative materials, using the Generalized Differential Quadrature (GDQ) and the Generalized Integral Quadrature (GIQ) methods. The software can investigate the mechanical behavior of these structures through different approaches and structural theories. In particular, this code allows to consider a kinematic expansion characterized by different degrees of freedom for the Equivalent Single Layer (ESL) theories and for each layer when the Layer-Wise (LW) approach is taken into account. As far as the materials are concerned, it is possible to consider different lamination schemes, as well as various distributions of the volume fraction of the constituents for those layers that vary their mechanical properties along the thickness. In addition, the software analyzes structures with variable thickness and characterized by variable mechanical properties that can change point by point. A finite element formulation is also available to investigate the mechanical behavior of plane structures characterized by irregular domains and mechanical discontinuities
La sfida dell'inclusione nella scuola secondaria
No full textIl processo di trasformazione della scuola secondaria italiana in direzione inclusiva pone interrogativi riferiti al ruolo, alla formazione e alla cooperazione tra educatoresocio-culturale e insegnante specializzato nelle attività di sostegno
Mechanical behaviour of cement-bitumen treated materials containing different amounts of reclaimed asphalt
No full textPeculiar Convergence and Accuracy for Laminated Moderately Thick Plates of Arbitrary Shape in Free Vibrations
No full textAs it is well known, engineering theories for plates and shells simplify the three-dimensional (3D) elasticity problem by introducing kinematic hypothesis which lead to simpler mathematical problems. Therefore, such simplified theories have limitations, which are strictly related to the initial hypotheses. The present work is based on the so-called Reissner-Mindlin theory or First-order Shear Deformation, which is used to study “moderately thick” plates. The term “moderately thick” refers to the fact that the plate is not “thin” as in the Classical Laminated Plate Theory (CLPT) or Kirchhoff-Love Theory and not “thick” as in the classical 3D theory of elasticity. Once the physical problem is mathematically well-posed, it is generally solved via numerical methods due to the complexity of finding analytical or semi-analytical solutions.
The present work aims to show a peculiar behavior in the solution of such problems by comparing the results obtained using strong and weak form finite element methods when the plates are in free vibrations. In particular, the authors compare the results obtained with two- and three-dimensional theories as a function of the plate thickness