1,721,629 research outputs found
A new approach for modeling the thermal behavior of methane catalytic partial oxidation monolith reactors
No full textA comprehensive computational model for the design of methane catalytic partial oxidation monolith reactors for hydrogen production has been developed and tested with respect to available experimental data. Allowing a simplified description of the heat release mechanism associated with the reforming process, the model represents a useful tool to address performances and durability issues in the design process of full scale catalytic reformers. The characteristic temperature peak along the catalyst channels, which is experimentally observed as a result of the competitive action of fuel complete oxidation and steam reforming is, in fact, a fundamental parameter to be controlled during the design process and is a complex function of catalyst formulation, mixture composition, and actual operating conditions. To address this issue in the present paper the heat release law mechanism has been studied with a new approach named heat release curves model (HRCM), which decouples the thermofluid dynamic analysis of real geometries from the modeling of heterogeneous chemistry. The model uses heat release curves extrapolated from detailed heterogeneous chemistry calculation or experimental measurements as the basis of a simplified, although still predictive, evaluation of the heat released, which allows a substantial reduction in computational costs. Validation of HRCM model (including heat release profiles approximation) with respect to more detailed simulations and available experimental data shows very good predictive capabilities with a maximum error lower than the 4% over a wide number of analyzed cases (accounting for several O/C ratios, inlet velocities, channel dimensions, and mean temperatures). Although presented for natural gas reforming the present model may be easily extended to different fuels
Un esercizio di valutazione esterna: come le Università piemontesi giudicano (indirettamente) le scuole della Regione
No full textde Simone (G.) et de Berrot (E.) — Premières observations sur une expérience de psychothérapie en groupe bifocal. Ann. Méd. Ps. 1963, n° 2, pp. 205-214
No full textde Simone (G.) et de Berrot (E.) — Premières observations sur une expérience de psychothérapie en groupe bifocal. Ann. Méd. Ps. 1963, n° 2, pp. 205-214. In: Bulletin de psychologie, tome 23 n°280, 1969. p. 163
Gli effetti della patologia respiratoria cronica sulla muscolatura
No full textRespiratory rehabilitation is indicated in all thoraco-pulmonary system diseases
in addition to pharmacologic treatment.
However, COPD remains the main disease receiving rehabilitative treatments. The
primary objective of rehabilitation is to improve the physical performance and reducing
dyspnoea. The individual’s rehabilitation plan is designed to achieve restoration of
both respiratory and limb muscle strength.La riabilitazione respiratoria trova indicazione in tutte le patologie coinvolgenti
il sistema toraco-polmonare nei diversi stadi di malattia come opzione terapeutica
complementare al trattamento farmacologico previsto. Tuttavia, è la BPCO la
patologia maggiormente trattata in riabilitazione. Lo scopo principale del trattamento
riabilitativo per i pazienti con BPCO è quello di migliorare la performance fisica
e la tolleranza fisica allo sforzo riducendo la spiacevole sensazione dispnoica. Il
programma di riabilitazione personalizzato alle esigenze del singolo paziente, stilato
dal team riabilitativo mira sostanzialmente al recupero della forza e della resistenza
dei muscoli, sia respiratori che degli arti
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