183 research outputs found
Presentazione
No full textPresentazione di un volume che è esito di un Convegno scientifico e di una esperienza sul campo durata tre anni, durante i quali si è tenuto sotto controllo scientifico l'insieme delle interferenze, a carico dell'identità personale, che possono derivare da terapie basate su diete rigorose e prolungate
Una nuova cultura per la pratica medica
No full textVengono esaminate le ripercussioni sui vissuti e sull'identità personale di alcune terapie basate su vincoli dietetici rigorosi e prolungati.
L'indagine affronta il problema sotto il profilo critico ermeneutico e viene accompagnata da una fase di riscontro empirico su un apprezzabile campione di adulti in cura presso un apposito centro ospedaliero
Effect of Cooling Airflow Intake Positioning on the Aerodynamics of a Simplified Battery Electric Road Vehicle
No full textThe transition towards battery electric vehicles (BEVs) has increased the focus of vehicle manufacturers on energy efficiency. Ensuring adequate airflow through the heat exchanger is necessary to climatize the vehicle, at the cost of an increase in the aerodynamic drag. With lower cooling airflow requirements in BEVs during driving, the front air intakes could be made smaller and thus be placed with greater freedom. This paper explores the effects on exterior aerodynamics caused by securing a constant cooling airflow through intakes at various positions across the front of the vehicle. High-fidelity simulations were performed on a variation of the open-source AeroSUV model that is more representative of a BEV configuration. To focus on the exterior aerodynamic changes, and under the assumption that the cooling requirements would remain the same for a given driving condition, a constant mass flow boundary condition was defined at the cooling airflow inlets and outlets. A parametric study was conducted by spatially moving the cooling intakes, with constant total area, across the front of the vehicle. Power consumption of the fan had to be considered when maintaining the desired airflow rate through intakes without sufficient ram air. As expected, moving intakes away from the stagnation region increased drag. Lateral outward movements altered the flow fields around the front wheels, while vertical movements of the intake only showed marginal flow changes across the top and bottom halves of the vehicle. The flow characteristics towards the rear were unaffected, and the changes observed were mostly local. Including power requirements of the fan, increments up to 15% of total vehicle drag were observed
Recirculating flow structures of a square-back Ahmed body at a variable attitude
No full text
The recirculating flow at the rear of a flat-base three-dimensional body with ground proximity is investigated for different body attitudes defined by the pitch angle varying in the range
and the yaw angle in the range
. Experiments measuring the three components of the mean velocity field in two perpendicular planes intersecting the recirculation area as well as the base pressure distribution are conducted for 50 different attitudes. They provide a clear correlation between the orientation of the spatially averaged reversed flow and the gradient at the centre of the base pressure distribution. Both vectors are found to be in the same so-called
w-
plane, that is perpendicular to the base of which the azimuthal position changes with the body attitude due to either the flow orientation at the base separation or sometimes to a ground separation for large nose-up pitch. Numerical simulations of the same geometry realised for 10 attitudes show satisfactory agreement with the force coefficients measured in the experiment. Base flow variations induced by attitude changes are also well captured, particularly that of the
w-
plane. The full three-dimensional simulation data are used to show that the inner structure of the separation bubble is always a tilted recirculation torus, where the tilt orientation is given by the base pressure gradient. At the bubble closure, a pair of longitudinal vortices symmetrically located on both sides of the
w-
plane are permanently observed with circulations consistent with the circulation of the dividing streamline separation in the
w-
plane.
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AN ECONOMIC THEORISTS' READING OF SIMONE WEIL
No full textIn Economics individuals are defined by their preferences over the consequences of their own actions and the actions carried out by others. In contrast, Simone Weil depicts the individual as continuously re-constituted by the contact that he establishes with reality via his action. Such an action is aimed at achieving an effect in the physical world, but what makes it human is not success per se, but rather the fact that it stems from reasoning and planning. Affliction is caused by effort carried out mechanically like that of a beast of burden, when the individual has no opportunity to exercise reason for choosing how to confront reality's ever-challenging hazards and necessity.
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