200,972 research outputs found
O Araguaia pelos Militares: Imaginários e Barbáries
No full textReview text “Araguaia by the Military: Imaginary and Barbaries” (2008), by the author Flávia M. Franchini Ribeiro.Review text “Araguaia by the Military: Imaginary and Barbaries” (2008), by the author Flávia M. Franchini Ribeiro.Texto da resenha "O Araguaia pelos Militares: Imaginários e Barbáries " da autora Flávia M. Franchini Ribeiro
Foreword to Women designers, craftswomen, architects and engineers between 1918 and 1945
No full textPrefazione al primo numero della Serie Women's Creativity di cui l'autrice Caterina Franchini è co-curatrice e membro dell'International International Editorial Board
Closure to “Extending the Global-Gradient Algorithm to Solve Pressure-Control Valves”
No full textNot Available - Closure to "Extending the Global-Gradient Algorithm to Solve Pressure-Control Valves" by Gioia Foglianti, Stefano Alvisi, Marco Franchini, and Ezio Todin
Caratterizzazione delle Emissioni Veicolari in Atmosfera: Sistema EVA
No full textCon attenzione al problema della qualità dell'aria ed in riferimento al suo inquinamento, viene preso in considerazione il contributo dovuto alle emissioni veicolari. Per potere condurre al meglio le analisi delle polveri e degli inquinanti presenti in atmosfera e dovuti a questo tipo di emissioni, si propone la realizzazione di un complesso sperimentale che, ricreando il più fedelmente possibile le condizioni ambientali in un volume chiuso e controllato, possa rendere possibili misure accurate e soprattutto complete delle emissioni veicolari, in rapporto alloro impatto con l'atmosfera. Tale dispositivo consentirà inoltre di certificare i veicoli in riferimento al loro impatto ambientale e ciò varrà anche per veicoli che utilizzeranno tecnologie alternative ai carburanti convenzionali. Autori: F. Frattini, M. Berico, F. Franchini, G. Zanin
La filosofia italiana di fronte al Grande Fratello. Croce e Franchini lettori di Orwell
No full textThe article deals with the reception of George Orwell’s 1984 in Italian philosophy, particularly in Benedetto Croce and Raffaello Franchini. Their notes highlight the novel’s profound philosophical and political structure: specifically, Croce delves into the Big Brother’s apocalyptic setting, which proceeds toward the abolition of the “discipline of thought”; Franchini focuses his attention on the relationship between totalitarianism and history, and especially on the “destruction of the past.
Evaluating water demand shortfalls in segment analysis
No full textIn this paper, two procedures for assessing water demand shortfalls following segment isolation are compared. The first (topological) procedure is based on a simple topological network analysis, and identifies the water demand shortfall as the water demand (under normal operational conditions) relative to the directly and/or indirectly isolated segment(s). The second (hydraulic) procedure is based on a pressure-driven hydraulic simulation of the network after segment isolation. Each of the two procedures was applied to two case studies, and the reliability (expressed in terms of maximum D max and weighted average D¯¯¯¯ water demand shortfall) and economic burden (expressed in terms of number N val or cost C val of installed valves) of the resulting isolation valve system solution were compared. As a whole, the results show that network analysis and redesign are affected by the choice of the global variables (D max or D¯¯¯¯) used to characterize the demand shortfalls in network segments. Analysis of the case studies is followed by a discussion of the rationale behind the choice between the two procedures, which needs to balance accurate demand shortfall characterization with limited computation times, particularly in the multi-objective design stage.E. Creaco, M. Franchini, S. Alvis
Comparison of various phased approaches for the constrained minimum-cost design of water distribution networks
No full textIn most cases, water system design is based on a demand forecast at the end of some planning horizon based on the final configuration of the system at that time. This design approach (aimed at designing all the network at a time) is incompliant with its actual development, which instead takes place in phases. As a consequence, in order to follow the network demand and layout growth in time, practitioners prefer to sub-divide the whole construction life into various time phases thus including the different phases of construction in the network design.
This work is aimed at analyzing and comparing three different phased approaches for constrained minimum-cost design of water distribution networks: the single-phase design with demand feedback, the multi-phase design without demand feedback and the multi-phase design with demand feedback. The difference between the single-phase design and the multiphase design lies in the fact that whereas the former entails optimizing a single construction phase at a time, i.e. the current construction phase, the latter is based on the phasing of construction and then is aimed at optimizing the current construction phase and all the subsequent phases, included inside a certain temporal horizon, simultaneously. The demand feedback is here used as a pragmatic tool for updating the forecast at some specific time instant of the future demand growth: such an update is performed by setting the future demand growth equal to that really observed in the previous time phase. Alternatively, the predicted demand growth rate at the generic time instant can be kept equal to the value assumed at the time instant when the generic node appears, without taking account of the demand variation really observed in time in the node (absence of demand feedback).
Applications to a real case study show that the multi-phase design with the demand feedback is the most reliable because it makes it possible to reduce the overall construction costs while attenuating the occurrence of pressure deficits in the various construction phases of the network. Optimal design for a single phase will virtually guarantee a sub-optimal solution over the long run
Laboratory Analysis of a Piston-Actuated Pressure-Reducing Valve under Low Flow Conditions
No full textThe effectiveness of pressure-reducing valves (PRVs) for optimal pressure management of water distribution networks (WDNs) is proven, but problems and operational limitations have been highlighted by some recent experiences. In this study, we analyse the functioning of a piston-actuated pressure-reducing valve (PA-PRV) with a mechanical pilot which is subjected to low-flow regimes, a condition that is often observed in real water distribution networks. The analyses were carried out by means of laboratory tests featuring two sets of experiments, i.e., (a) by testing the behaviour of the PRV when a pre-established initial value and subsequent variation of flow rate occurs in the system and (b) by testing the PRV against a temporal series of flow rates observed at the inlet section of a real district metered area. The first set of tests showed that the PA-PRV tends not to maintain pressure at the imposed set-point and exhibits an unstable behaviour characterised by significant pressure oscillations under some flow rate conditions. The second set of laboratory tests showed that the anomalous behaviour identified in the first set of tests can occur under ordinary operational conditions of a network
Hydrodynamics of local excitations after an interaction quench in 1D cold atomic gases
No full textWe discuss the hydrodynamic approach to the study of the time evolution -induced by a quench- of local excitations in one dimension. We focus on interaction quenches: the considered protocol consists in creating a stable localized excitation propagating through the system, and then operating a sudden change of the interaction between the particles. To highlight the effect of the quench, we take the initial excitation to be a soliton. The quench splits the excitation into two packets moving in opposite directions, whose characteristics can be expressed in a universal way. Our treatment allows to describe the internal dynamics of these two packets in terms of the different velocities of their components. We confirm our analytical predictions through numerical simulations performed with the Gross-Pitaevskii equation and with the Calogero model (as an example of long range interactions and solvable with a parabolic confinement). Through the Calogero model we also discuss the effect of an external trapping on the protocol. The hydrodynamic approach shows that there is a difference between the bulk velocities of the propagating packets and the velocities of their peaks: it is possible to discriminate the two quantities, as we show through the comparison between numerical simulations and analytical estimates. In the realizations of the discussed quench protocol in a cold atom experiment, these different velocities are accessible through different measurement procedures. ArXI
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