Manuale per la prevenzione del rischio incendio negli interventi di riqualificazione energetica degli edifici per il lavoro

Il volume presenta i principali risultati del progetto RiqualiFire Prevenire il rischio incendio nella riqualificazione energetica degli edifici, co-finanziato dalla Direzione Regionale per la Campania dell’Inail e dall’Università degli Studi di Napoli Federico II

Manuale per la prevenzione del rischio incendio negli interventi di riqualificazione energetica degli edifici per il lavoro

Il volume presenta i principali risultati del progetto RiqualiFire Prevenire il rischio incendio nella riqualificazione energetica degli edifici, co-finanziato dalla Direzione Regionale per la Campania dell’Inail e dall’Università degli Studi di Napoli Federico II

Reconstructing blockages in a symmetric duct via quasi-isospectral horn operators

This paper proposes a new method for the reconstruction of the blockage area function in a symmetric duct by resonant frequencies under a given set of end conditions, i.e., open open or closed-closed ends. The analysis is based on the explicit determination of quasi-isospectral ducts, that is duct profiles which have the same spectrum as a given duct with the exception of a single eigenfrequency which is free to move in a prescribed interval. The analytical reconstruction was numerically implemented and tested for the detection of blockages. Numerical results show that the accuracy of identification increases with the number of eigenfrequencies used and that the reconstruction is rather stable with respect to the shape, the size and the position of the blockages

Prediction of stresses and strains around model tunnels with adjacent embedded walls in overconsolidated clay

This paper presents the results of finite element analyses carried out using different constitutive models for overconsolidated clay: the Modified Cam clay model and the Three-Surface Kinematic Hardening (3-SKH) model. These analyses are evaluated against data from an extensive series of physical model tests examining the influence of an embedded wall placed near a tunnel on ground movements and tunnel stability. It is shown that for heavily overconsolidated soils reasonable predictions of both deformations and failure can be obtained from kinematic hardening models such as the 3-SKH model, which allow plastic deformation inside a Modified Cam clay state boundary surface

Numerical size estimates of inclusions in Kirchhoff-Love elastic plates

The size estimates approach for Kirchhoff--Love elastic plates allows to determine upper and lower bounds of the area of an unknown elastic inclusion by measuring the work developed by applying a couple field on the boundary of the plate. Although the analytical process by which such bounds are determined is of constructive type, it leads to rather pessimistic evaluations. In this paper we show by numerical simulations how to obtain such bounds for practical applications of the method. The computations are developed for a square plate under various boundary loads and for inclusions of different position, shape and stiffness. The sensitivity of the results with respect to the relevant parameters is also analyzed

Efficiency of CFRP NSM strips and EBR laminates for flexural strengthening of RC beams

The efficiency of Fiber Reinforced Polymer (FRP) materials for strengthening existing Reinforced Concrete (RC) structures according to the Near Surface Mounted (NSM) technique can be greater than the External Bonded Reinforcement (EBR) technique since the tensile strength of the FRP materials is in general better exploited. Firstly, this paper deals with analyzing the effect of the loading pattern on RC beams strengthened with both types of strengthening technique; in particular, two loading patterns have been used for the experimental tests on simple supported beams: 1) a four points bending scheme, and 2) a scheme with distributed loads, in order to check the sensitivity of failure modes and ultimate loads to different distributions of bending moment and shear along the beam. Then, a comparison between the results of flexural tests on RC beams strengthened with both NSM and EBR techniques is dealt with

Matematica, Musica e Tecnologie: un trinomio possibile

ItIn questo lavoro descriviamo come le tecnologie dell'informazione e della computazione arricchiscono il classico rapporto tra Matematica e Musica, mettendo a disposizione dell'artista nuovi metodi e strumenti per la creativita' musicale. I nuovi modelli della Scienza legati ai frattali, ai sistemi dinamici, alla complessita' e al caos forniscono una grande quantita' di strutture matematiche che attraverso opportuni codici possono essere tradotti in suoni e musica. L'artista puo' usare questo contesto per le proprie produzioni, ed il matematico puo' trovare nelle produzioni musicali una semantica delle strutture matematiche astratte che intervengono nel corso dei suoi studi. In questo lavoro vengono esplorati i rapporti tra Spazi Matematici, Spazi Sonori e Spazi Musicali e come le strutture matematiche possono essere tradotte in musica attraverso opportuni codici

Numerical simulation of lava flow using a GPU SPH model

A smoothed particle hydrodynamics (SPH) method for lava-flow modeling was implemented on a graphical processing unit (GPU) using the compute unified device architecture (CUDA) developed by NVIDIA. This resulted in speed-ups of up to two orders of magnitude. The three-dimensional model can simulate lava flow on a real topography with free-surface, non- Newtonian fluids, and with phase change. The entire SPH code has three main components, neighbor list construction, force computation, and integration of the equation of motion, and it is computed on the GPU, fully exploiting the computational power. The simulation speed achieved is one to two orders of magnitude faster than the equivalent central processing unit (CPU) code. This GPU implementation of SPH allows high resolution SPH modeling in hours and days, rather than in weeks and months, on inexpensive and readily available hardware