344 research outputs found
Influenza della modellazione nell’analisi strutturale di un cassone da ponte
No full textIn questo lavoro è descritto come differenti modellazioni di una stessa struttura possono far corrispondere differenti risultati in termini sollecitazioni. L’utilizzo di ipotesi semplificative, tipiche di modelli semplificati e di corrente uso, possono portare, a volte, ad errori non trascurabili. La scelta del tipo di modellazione di una è un processo critico che deve tener conto sia delle caratteristiche geometriche che del tipo di carico, ma anche dei tempi macchina e della facilità di interpretazione dei risultati di output
Covid, la lezione del Pacifico. Come i paesi avanzati di Asia e Oceania hanno contenuto il virus e perché noi non li abbiamo imitati. Prefazione di Luca Ricolfi
No full textCi avevano detto che eravamo stati bravi, che bastava seguire le regole e sarebbe andato tutto bene, si parlava di “modello Italia”. Invece no: non siamo stati bravi, le regole erano sbagliate, l’Italia è semmai il modello di ciò che non si deve fare e tutto è andato male, anzi, malissimo. Come è possibile che i paesi più ricchi e progrediti dell’Occidente abbiano più morti del Terzo Mondo? Cosa hanno fatto di diverso i paesi avanzati dell’Asia e dell’Oceania per avere messo il virus sotto controllo già da un anno? E perché l’Europa e la OMS fanno di tutto per nascondere i loro successi anziché imitarli? A queste inquietanti domande tentano di rispondere i saggi raccolti in questo libro, originariamente pubblicati sul sito della Fondazione Hume diretta da Luca Ricolfi: non solo per capire gli errori commessi, ma soprattutto per non ripeterli quando dovremo affrontare problemi ben più gravi come quelli ecologici, che potrebbero portare alla fine della nostra civiltà
Finding the Pareto Optimal Equitable Allocation of Homogeneous Divisible Goods Among Three Players
No full textWe consider the allocation of a finite number of homogeneous divisible items among three players. Under the assumption that each player assigns a positive value to every item, we develop a simple algorithm that returns a Pareto optimal and equitable allocation. This is based on the tight relationship between two geometric objects of fair division: The Individual Pieces Set (IPS) and the Radon–Nykodim Set (RNS). The algorithm can be considered as an extension of the Adjusted Winner procedureby Brams and Taylor to the three-player case, without the guarantee of envy-freeness
Dividing homogeneous divisible goods among three players
No full textWe consider the division of a finite number of homogeneous divisible items among three
players. Under the assumption that each player assigns a positive value to every item, we
characterize the optimal allocations and we develop two exact algorithms for its search. Both
the characterization and the algorithm are based on the tight relationship two geometric
objects of fair division: the Individual Pieces Set (IPS) and the Radon-Nykodim Set (RNS)
Entrepreneurial opportunities in an “industry vacuum”? Platforms as external enablers
No full textSharing economy platforms are external digital enablers of entrepreneurship, in the sense that they enable the entry of new entrepreneurs at negligible costs for very different levels of investment and engagement. However, we argue that their potential for entrepreneurial opportunities is not always the same in different "market contexts." This study investigates how the characteristics of a local market influence entrepreneurship enacted by a platform in that specific geographic area. We study the hospitality industry and Airbnb where entrepreneurs can endogenously decide their "scale of operations." We highlight how small- and large-scale entrepreneurs are equally driven by the perceived demand and labor market conditions; still, they respond differently to competition structure, demand quality, and opportunity costs. Interestingly, the decision to upscale from a small scale to a large scale is determined by the same economic reasoning driving entry with a large scale at first
Chemotherapy-based versus chemotherapy-free stem cell mobilization (± plerixafor) in multiple myeloma patients: an Italian cost-effectiveness analysis
No full textGiven the availability and efficacy of the mobilizing agent plerixafor in augmenting hematopoietic progenitor cell mobilization with granulocyte colony-stimulating factor (G-CSF), there is a strong case for comparing the cost-effectiveness of mobilization with G-CSF + cyclophosphamide versus G-CSF alone. This study investigated the cost and effectiveness (i.e., successful 4 million-CD34+ collection) of G-CSF alone versus high-dose cyclophosphamide (4 g/m2) + G-CSF mobilization (± on-demand plerixafor) in patients with multiple myeloma (MM) eligible for autograft in Italy. A decision tree-supported cost-effectiveness analysis (CEA) model in MM patients was developed from the societal perspective. The CEA model compared G-CSF alone with cyclophosphamide 4 g/m2 + G-CSF (± on-demand plerixafor) and was populated with demographic, healthcare and non-healthcare resource utilization data collected from a questionnaire administered to six Italian oncohematologists. Costs were expressed in Euro (€) 2019. The CEA model showed that G-CSF alone was strongly dominant versus cyclophosphamide + G-CSF (± on-demand plerixafor), with incremental savings of €1198.59 and an incremental probability of a successful 4 million-CD34+ apheresis (+0.052). Sensitivity analyses confirmed the robustness of the base-case results. In conclusion, chemotherapy-free mobilization (± on-demand plerixafor) is a “good value for money” option for MM patients eligible for autograft. © 2021, The Author(s)
«Like Moths to the Lighthouse»: dissolvenze fiorentine in The Soul’s Gymnasium di Sir Harold Acton
No full textExploiting D-Mason on parallel platforms: A novel communication strategy
No full textAgent-based simulation models are a powerful experimental tool for research and management in many scientific and technological fields.D-Mason is a parallel version of Mason, a library for writing and running Agent-based simulations.In this paper, we present a novel development of D-Mason, a decentralized communication strategy which realizes a Publish/Subscribe paradigm through a layer based on the MPI standard. We show that our communication mechanism is much more scalable and efficient than the previous centralized one
Experimental Analysis of the Thermal Performance of Wood Fiber Insulating Panels
No full textDuring the last decades, attention to energy and environmental problems has significantly grown, along with the development of international and national policies addressing sustainability issues. In the construction sector, one of the most widespread energy efficiency strategies consists of thermal insulation of buildings thanks to external insulating panels. Among these, wood fiber is an insulating material characterized by a natural, eco-sustainable and biodegradable structure, coming from the recycling of waste wood from sawmills. The present study aimed to characterize small test building insulated with wood fiber panels from the thermal point of view, comparing the results with those of an identical, non-insulated reference test building. The experimental campaign highlighted several advantages and an excellent thermal performance provided by the eco-sustainable solution of wood fiber insulating panels: Lower values of the thermal transmittance (−57%), thus ensuring greater stability of the internal air temperature and better values in terms of attenuation (−60% in summer and −74 % in winter) and phase shift (+2 h in summer and +2.28 h in winter) compared to those obtained from the reference building. The material is also equipped with an Environmental Performance Declaration (EPD) that certifies its environmental benefits
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