1,721,102 research outputs found
High Speed Marine Vehicles With Aerodynamic Surfaces: Development of a Dynamic Model for a Novel Configuration.
Full text linkA research programme on high speed marine vehicles fitted with aerodynamic
surfaces started in Cranfield University in 2005. One of the configurations
analyzed is a high speed prismatic planing hull with one or more aerodynamic
surfaces; it is called a hybrid vehicle (HV). Two mathematical models have been
developed for the dynamic behavior which is a combination of the very different
behaviors of aircraft and ships. The first model estimates the equilibrium
attitude of the HV at a certain speed. A parametric analysis for the influence
of the configuration on the performance of the HV has been conducted (1). With
the second model, the authors propose a set of ordinary differential equations
of motion, derived in the frame of small-disturbance stability theory which has
been used to investigate the longitudinal dynamic stability of the HV (2). Ref.
(1) and (2) present a complete description of the mathematical models, while
this article summarizes the methodology adopted to develop these dynamic models
and gives a brief summary of the results. (1) COLLU, M., PATEL, M. H., TRARIEUX,
F., A Mathematical Model to analyze the Static Stability of Hybrid (Aero-
hydrodynamically supported) vehicles., 8th Symposium on High Speed Marine
Vehicles 2008 (HSMV08), Naples, Italy, 2008. (2) COLLU, M., PATEL, M. H.,
TRARIEUX, F., A Unified Mathematical Model for High Speed Hybrid (Air and Water-
borne) Vehicles., 2nd International Conference on Marine Research and
Transportation, 2007
Yawning is elicited by D2 dopamine agonists but is blocked by the D1 antagonist, SCH 23390
No full textDopamine hypothensis of affective disorders: Behavioural, Biochemical and Electrophysiological evidences from chronic treatment with antidepressants.
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Sensitization to DA agonists induced by chronic imipramine and electroconvulsive schock: evidence for separate mechanism.
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
3D URANS analysis of a vertical axis wind turbine in skewed flows
Full text linkThe paper demonstrates the potential of an unsteady RANS 3D approach to predict the effects of skewed winds on the performance of an H-type vertical-axis wind turbine (VAWT). The approach is validated through a comparison between numerical and experimental results for a full-scale Darrieus turbine, demonstrating an improved prediction ability of 3D CFD with respect to both 2D CFD and semi-empirical models based on the double multiple stream tubes method. A 3D URANS approach is then adopted to investigate the power increase observed for a straight-bladed small-scale turbine in a wind tunnel when the rotational axis is inclined from 0° to 15° from the vertical. The main advantage of this approach is a more realistic description of complex three-dimensional flow characteristics, such as dynamic stall, and the opportunity to derive local blade flow conditions on any blade portion during upwind and downwind paths. Consequently, in addition to deriving the turbine overall performance in terms of power coefficient, a better insight into the temporal and spatial evolution of the physical mechanisms is obtained. Our principal finding is that the power gain in skewed flows is obtained during the downwind phase of the revolution as the end part of the blade is less disturbed by the wake generated during the upwind phase
La valutazione e la contabilizzazione delle stock option in base al principio contabile internazionale IFRS2
No full textI piani di Stock Option sono strumenti di incentivazione del personale che hanno visto il loro maggior sviluppo nella prassi americana e anglosassone, ed ora in virtù dell’emanazione del IFRS21 costituiscono un argomento nuovo a livello di valutazione e contabilizzazione nei bilanci delle società italiane.
L’articolo si sofferma sulla definizione e sulla descrizione dei piani di Stock Option e delle loro principali caratteristiche e affronta il problema del pricing alla luce del fatto che le opzioni in argomento non sono mai riconducibili ad opzioni di tipo standard (europeo o americano) e ogni piano, pertanto, richiede lo sviluppo e l’implementazione di modelli di pricing dedicati basati – come richiesto dagli IAS / IFRS - sulla strumentazione tradizionale della Finanza Matematica (valutazioni risk neutral e assenza di arbitraggio).
La trattazione è conclusa da un’applicazione pratica nella quale si mostra lo sviluppo del calcolo del Fair Value per un vero piano di Stock Option e la quantificazione degli importi la cui contabilizzazione è richiesta dal principio
contabile internazionale IFRS 2
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