Search results for "ECC"
showing 10 items of 2939 documents
La Sindrome da Disfunzione Lacrimale e le malattie sistemiche
2011
L'autore traccia un breve escursus sulle malattie sistemiche che possono determinare la "sindrome dell"occhio secco", al fine di un corretto inquadramento diagnostico ad uso degli ambulatori oculistici, caratterizzati da un ambiente "Low tech" ma con un elevato flusso di utenza.
L'opera di Francesco Maria da Lecce alla luce dei dati dell'Archivio di Propaganda Fide
2017
Firmly based on documents treasured in the Archive of Propaganda Fide in Rome, Gëzim Gurga reconstructs the most salient moments in the life of the missionary Francesco Maria da Lecce. The Franciscan is famous for having fathered the first ever Albanian grammar published by the title of Osservazioni grammaticali nella lingua Albanese (1716), as well as a remarkable Italian-Albanian dictionary. In his study, the author recounts the tough social and cultural conditions which the Albanian Catholics were living in during the Ottoman rule. A lot of attention, on the other hand is devoted to the efforts of the missionaries in the struggle against apostasy, to the promotion of faith and crypto-Chr…
2015. 2. Por qué celebrar primarias
2015
¿Por qué celebrar primarias? ¿Beneficia o perjudica a las organizaciones y partidos que las promueven?, ¿Mejora la participación?, ¿La elección de los dirigentes evita la oligarquización y la Ley de Hierro de los partidos políticos que enunció Robert Michels? Un sistema de selección de candidatos con origen en la política norteamericana, fue adaptado por el PSOE, y a continuación iría extendiéndose su práctica a los todos los partidos políticos. Ignacio Urquizu señalaba sobre las elecciones primarias, en 2013 que: «Esta experiencia se ha repetido en España en 13 ocasiones más, aunque sólo en el ámbito regional. Únicamente en una ocasión las utilizó el PP y fue en las últimas elecciones auto…
Pecking Order Versus Trade-off: An Empirical Approach to the Small and Medium Enterprise Capital Structure
2003
In this paper, we explore two of the most relevant theories that explain financial policy in small and medium enterprises (SMEs): pecking order theory and trade-off theory. Panel data methodology is used to test the empirical hypotheses over a sample of 6482 Spanish SMEs during the five-year period 1994?1998. The results suggest that both theoretical approaches contribute to explain capital structure in SMEs. However, while we find evidence that SMEs attempt to achieve a target or optimum leverage (trade-off model), there is less support for the view that SMEs adjust their leverage level to their financing requirements (pecking order model). En este trabajo, exploramos dos de las teorías má…
Inspección en la arteriopatía periférica
2010
La inspección de la piel en la arteriopatía periférica se realiza tanto en bipedestación como en decúbito. Nos informa sobre la circulación periférica y sus modificaciones respecto a los cambios posturales.
Inspección en la insuficiencia venosa
2010
La inspección en la insuficiencia venosa se realiza tanto en bipedestación como en decúbito. Se centra en la coloración de la piel, y la presencia de varices, fleboedema y signos de úlcera varicosa.
Trajectory tracking for an Ultralight WIG
2007
In this paper we present our research about a particular ultralight WIG. We have carried out the design of a Flight Control System that has to fix the control variables trend through a non-linear mathematical model, because of the particular geometric and aerodynamic configuration of this WIG. So, the non-linear mathematical model design has to reproduce exactly the aircraft behaviour either OGE or IGE. In particular, through classical semi-empirical relations, analytical equations have been obtained in order to evaluate incidence variations, downwash and upwash angles due to the ground. In the present paper only longitudinal dynamic is considered, because of its peculiarity in WIG's aircra…
Control of hysteretic instability in rotating machinery by elastic suspension systems subject to dry and viscous friction
2010
Abstract Most of the undesired whirling motions of rotating machines can be efficiently reduced by supporting journal boxes elastically and controlling their movement by viscous dampers or by dry friction surfaces normal to the shaft axis, which rub against the frame. In the case of dry dampers, resonance ranges of the floating support configuration can be easily cut off by planning a motionless adhesive state of the friction surfaces. On the contrary, the dry friction contact must change automatically into sliding conditions when the fixed support resonances are to be feared. Moreover, the whirl amplitude can be restrained throughout the speed range by a proper choice of the suspension-to-…
An EKF Based Method for Path Following in Turbulent Air
2017
An innovative use of the Extended Kalman Filter (EKF) is proposed to perform both accurate path following and adequate disturbance rejection in turbulent air. The tuned up procedure employs simultaneously two different EKF: the first one estimates gust disturbances, the second one estimates modified aircraft parameters. The first filter, by using measurements gathered in turbulent air, estimates both aircraft states and wind components. The second one, by using the estimated disturbances, obtains command laws that are able to reject disturbances. The predictor of the second EKF uses the estimated wind components to solve motion equations in turbulent air. Besides a set of unknown stability …
Automatic EKF tuning for UAS path following in turbulent air
2018
By using two simultaneously working Extended Kalman Filters, a procedure is implemented in order to perform in a fully autonomous way the path following in turbulent air. To guarantee the robustness of the proposed algorithm, an automatic tuning procedure is proposed to determine optimal values of Process and Measurement Noise statistics. Such a procedure is based on both the characteristics of the disturbances and the desired flight path; in particular, a specific performance index is applied to tune filters. In this way control laws are adapted to the flight condition and these lead to an optimal path-following. This research represents an upload of previous papers. It allows eliminating …