Time domain analysis of ship motion and wave loads by boundary integral equations

In this presentation, we like to discuss some aspects of a more general computational algorithm for the prediction of ship motion and loads induced by the interaction with wave systems. In particular, unlikely the more conventional models in frequency domain, we attack the problem by a time domain formulation. The purpose is twofold. First, within the framework of a linear analysis, the ship response function to a general wave excitation can be numerically determined by a transient test (i.e. the interaction with a wave pulse compact in time). In this way, a substantial saving of computational time with respect to the existing algorithm is achieved. Second, a time domain modeling is intrinsically prone to deal with the fully nonlinear problem or, at least, to recover some nonlinear effects

Il piccolo schermo tra istruzione e divulgazione. Le logiche produttive di RAI Cultura

Like private television networks, RAI tries to differentiate and characterize its original TV programs, adopting particular creative lines. This essay aims to analyse the production logics of RAI Cultura, an organization created in 2014 from the ashes of RAI Educational, which produces pedagogical and informative content. The first part is dedicated to the analysis of telecasts, where educational programming and projects targeted at tweens are alternated with more in-depth themes for a general audience. The second part reflects on the evolution of these two strands in their transition to online platforms, and therefore rethinks the very concept of production

Fluid-solid interaction modeling for sloshing flows in flexible tanks

The scope of the presentation is to review our ongoing research on the numerical modeling of sloshing in deformable tanks

Numerical Simulation of Heavy Water Shipping

Rough-sea conditions can result in shipping of water on the deck of vessels. In particular, our ongoing investigation is focused on the bow-deck wetness in head-sea conditions for a moored ship, i.e. without forward speed. Though in practice three-dimensional effects matter, two-dimensional investigations are undertaken to gain basic insights, before developing more realistic three-dimensional approaches. In previous Workshops, a combined numerical-experimental analysis has been presented. In particular, a potential flow model has been assumed and a Mixed Eulerian-Lagrangian method has been adopted to solve the unsteady interaction between the body and the free surface. The Boundary Element Method (BEM) has been used as numerical solver. In the experiments, a two-dimensional nearly-rectangular ship model has been placed in a narrow wave flume, and the first water-on-deck event due to incoming waves generated by a flap wavemaker has been investigated. The model is fixed and resembles the centerplane of a ship. Comparisons confirmed the validity of the adopted flow model and the efficiency of the BEM in capturing the water shipping from a global point of view as well as in predicting some local features, such as the initial pressure along a superstructure under the impact of the shipped water

An investigation of water on deck phenomena

Shipping of water on deck represents a danger both for moored (as FPSO) and for advancing ships. When a compact mass of water (\u27green water\u27) is shipped onto the deck, the fluid moves with high speed, being able to damage superstructures and equipments and to be a risk for human lives. Also, the shipped water can significantly alter the dynamics of smaller vessels. Such events make the green water loads an important parameter to take into account even at design stage and call for predictive tools. However, knowledge about the physics involved is still limited and motivates increasing research effort

GREEN WATER LOADING ON A DECK STRUCTURE

At the previous Workshop, a numerical investigation of water-on-deck phenomena was presented by the same au- thors. A two-dimensional problem was considered. The ef- fect of main wave- and body-parameters was studied. The fully nonlinear problem was solved by boundary-integral e- quations. Here, we discuss a continuation of that activity. Results from an on-going experimental investigation are p- resented, together with the analysis of the interaction of the fluid on the deck with superstructures

Gold-Catalysed Heck Reaction: Fact or Fiction?

Two recent high-profile publications described the formation of Heck-type arylated alkenes catalysed by MeDalPhosAuCl / AgOTf (J. Am. Chem. Soc. 2023, 145, 8810) and their cyclisation to tetralines (Angew. Chem. Int. Ed. 2023, e202312786), claiming that these were the first demonstrations of alkene insertion into Au-aryl bonds, β-H elimination and chain-walking by Au-H cations under catalytic conditions. We show here that in fact this chemistry is a two-stage process. Only the first step, the production of an alkyl triflate ester as primary product by the well-known alkene heteroarylation sequence, involves gold. The subsequent formation of Heck-type olefins and their cyclisation to tetralines represent are classical H+-triggered carbocationic chemistry. These steps proceed in the absence of gold with identical results. Literature claims of new gold reactivity such as chain walking by the putative [LAuH]2+ dication have no basis in fact

I "media industry studies" in Italia: nuove prospettive sul passato e sul presente dell’industria cine-televisiva italiana

This issue investigates the current state and possible developments ofMedia Industry Studies in Italy.  Through multiple perspectives andresearch methodologies, it offers insights on the changing role ofItalian public service broadcasting, on the network relations andmodes of production of Italian cinema in the 1950s and 1960s, and onthe challenges posed by the contemporary media landscape

Atleta, divo e anti-eroe: nuovi archetipi sportivi nel cinema italiano contemporaneo

Fin dagli esordi, il cinema italiano ha intrecciato le proprie produzioni con l’immaginario sportivo, nel desiderio di promuovere esempi di virilità e di mascolinità ricorrenti che meglio rappresentassero l’identità italiana. Se per gran parte del Novecento figure fisicamente vigorose e moralmente ineccepibili hanno pertanto guidato e modellato la rappresentazione cinematografica dell’atleta, negli anni Duemila tale idealistico archetipo è gradualmente scomparso, permettendo a nuove declinazioni di emergere e sedimentarsi. Il saggio si prefigge pertanto di individuare tre inedite tipologie di sportivi, partendo dal circoscritto filone di film dedicati allo sport prodotti in Italia nel corso del nuovo millennio