59 research outputs found
Efficacy of chewing gum on intestinal function recovery after radical cystectomy: a randomized controlled trial protocol
No full textInvestment in different sized SMRs: economic evaluation of stochasticscenarios by INCAS code
No full textSmall Modular LWR concepts are being developed and proposed to investors worldwide. They capitalize on operating track record of GEN II LWR, while introducing innovative design enhancements allowed by smaller size and additional benefits from the higher degree of modularization and from deployment of multiple units on the same site. (i.e. “Economy of Multiple” paradigm) Nevertheless Small Modular Reactors pay for a dis-economy of scale that represents a relevant penalty on a capital intensive investment. Investors in the nuclear power generation industry face a very high financial risk, due to high capital commitment and exceptionally long pay-back time. Investment risk arise from uncertainty that affects scenario conditions over such a long time horizon. Risk aversion is increased by current adverse conditions of financial markets and general economic downturn, as is the case nowadays. This work investigates both the investment profitability and risk of alternative investments in a single Large Reactor or in multiple SMR of different sizes drawing information from project’s Internal Rate of Return stochastic distribution. multiple SMR deployment on a single site with total power installed. equivalent to a single LR. Uncertain scenario conditions and stochastic input assumptions are included in the analysis, representing investment uncertainty and risk. Results show that, despite the combination of much larger number of stochastic variables in SMR fleets, uncertainty of project profitability is not increased, as compared to LR: SMR have features able to smooth IRR variance and control investment risk. Despite dis-economy of scale, SMR represent a limited capital commitment and a scalable investment option that meet investors’ interest, even in developed and mature markets, that are traditional marketplace for LR
Elaborazione di un approccio metodologico per la riqualificazione energetica e ambientale degli edifici scolastici esistenti
No full textLo studio presenta gli esiti di una ricerca finalizzata alla definizione di procedure operative di retrofit energetico e innalzamento della qualità ambientale per intervenire in modo programmato, sistemico e integrato sugli edifici scolastici esistenti sotto il profilo dell’innalzamento della qualità edilizia, delle condizioni d’uso per l’utente, della riduzione dei consumi e del miglioramento della gestione delle risorse economiche a disposizione dell’Ente Proprietario
Load following by cogeneration: options for small modular reactors, Gen IV reactor and traditional large plants
No full textNuclear Power Plants (NPPs) has been historically deployed to cover the base-load of the electric power demand. Nowadays this scenario is changing and some NPPs are requested to perform daily load cycling operation (i.e. load following) between 50% and 100% of their rated power. The traditional methods to perform the load following are by inserting negative or positive reactivity into the core, moving the control rods. This strategy reduces the produced thermal power and in turn the electric power output with respect to the base-load strategy. From a technical standpoint this strategy submits the primary circuit to thermodynamic transients, which causes thermomechanical stresses on some components. From an economic standpoint this operation is very inefficient since, in NPPs, costs are mainly fixed and sunk, and there is a negligible cost saving (if any) in reducing the power of the reactor. A more efficient alternative might be doing the “Load Following by Cogeneration”, i.e. performing the Load Following by diverting the excess of power to an Auxiliary Plant. This paper assesses the technical feasibility of the coupling between a NPP and hypothetical cogenerate plants producing: diesel-like fuels from plastic pyrolysis, or desalinated water, or pellets from waste wood, or hydrogen from water splitting
VLSI implementation of the metering signal generator for switching system analog terminations
No full textCertified sustainability for heritage buildings: development of the new rating system GBC Historic Building™
No full textThe identification of historical value must be an integrated part of a sustainable building process aimed at the preservation and enhancement of its all previous expressions with the ultimate goal of identification, enhancement and transmission of the cultural heritage to the future generations. Green Building Council Italia is moving within this cultural context with the main goal, developed through an interdisciplinary working group, of the estab-lishment of a voluntary certification protocol aimed at evaluating the sustainability level of restoration, refurbishment and partial integration in pre-industrial buildings. The paper pre-sents the new rating system GBC Historic BuildingTM starting from the identification of the protocol’s field of application and moving to the new topic “Historic Value”, introduced with the goal of improving the building’s sustainability level without compromising its cul-tural value. The paper also shows the innovations added throughout the new protocol and the contribution of the first registered case study
La riqualificazione energetico-ambientale del tessuto storico. Un borgo eco-sensibile per tradurre il sisma in opportunità
No full textUna situazione critica come quella che si presenta davanti ai disastri naturali può essere anche considerata, con coraggio, un’opportunità per integrare le operazioni di recupero del costruito con strategie per il miglioramento della qualità ambientale e di vita dei tessuti edilizi. Lo studio, denominato “borgo-clima”, ha previsto la definizione di strategie per l’innalzamento delle prestazioni energetiche dell’intero aggregato urbano in relazione ai differenti gradi di intervento possibili sui singoli fabbricati e alle esigenze di recupero, consolidamento e rifunzionalizzazione
La riqualificazione energetico-ambientale del tessuto storico. Un borgo eco-sensibile per tradurre il sisma in opportunità
No full textUna situazione critica come quella che si presenta davanti ai disastri naturali può essere anche considerata, con coraggio, un’opportunità per integrare le operazioni di recupero del costruito con strategie per il miglioramento della qualità ambientale e di vita dei tessuti edilizi. Lo studio, denominato “borgo-clima”, ha previsto la definizione di strategie per l’innalzamento delle prestazioni energetiche dell’intero aggregato urbano in relazione ai differenti gradi di intervento possibili sui singoli fabbricati e alle esigenze di recupero, consolidamento e rifunzionalizzazione
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