Search results for "Opera"

Predictability, chaos and coordination in bird vigilant behaviour

1999

Revisiting Bicausative Matrices: The Swiss Cheese of Chaos

2009

This paper returns to de Mesnard's paper of 2000, which has exposed the so-called method of bicausative matrices. This method was created to analyze the structural change between two matrices, as an improvement of the causative method of Jackson and al. (1990). In its 2000 paper, de Mesnard has shown that chaos affects the bicausative method: two solutions are found with a brutal switching between both. This new paper demonstrates that the chaos can be largely circumvented, is essentially localized in a small interval and is only a transitory effect between two non-chaotic "regimes", is not always observed, is limited to relatively small matrices.

FILTERING CHAOS: A TECHNIQUE TO ESTIMATE DYNAMICAL AND OBSERVATIONAL NOISE IN NONLINEAR SYSTEMS

2005

Nonlinear dynamical models are frequently used to approximate and predict observed physical, biological and economic systems. Such models will be subject to errors both in the model dynamics, and the observations of the underlying system. In order to improve models, it is necessary to understand the causes of error growth. A complication with chaotic models is that small errors may be amplified by the model dynamics. This paper proposes a technique for estimating levels of both dynamical and observational noise, based on the model drift. The method is demonstrated for a number of models, for cases with both stochastic and nonstochastic dynamical errors. The effect of smoothing or treating …

Construction of pseudo-random sequences from chaos

2002

(no title)

1999

We propose hereafter that the signature of the Space-Time metric (+++-) is not anymore frozen at the Planck scale and presents quantum fluctuations (+++±) untill 0 scale where it becomes Euclidean (++++). (i) At the albraic level we suggest an oscillation path (3,1) (4,0) exluding (2,2). We built the quotient topological space describing the superposition of the Lorentzian and the Riemanian metrics. In terms of quantum groups we evidence a relation between q-deformation and deformation of the signature. We have obtained a new algebraic construction ( a new cocycle bicross products by twisting) which allowed us to unify the Lorentzian and the Euclidean signatures within a unique quantum grou…

NAVIGAZIONE WEB CONDIVISA ED E-CONFERENCE COME STRUMENTI DI APPRENDIMENTO

2009

La ricerca riguarda una sperimentazione, nell’ambito di percorsi universitari in blended e-learning che ha come obiettivo l’individuazione di buone pratiche a sostegno di percorsi di apprendimento in settori specialistici che richiedono un’interazione più assidua e diretta tra studenti e docenti /tutor. Alcuni autori affermano che le capacità di comunicazione asincrona della rete facilitano esperienze di apprendimento contemporaneamente indipendenti e collaborative (cfr. Garrison e Kanuka, 2004). Nella comunicazione via web forum si sviluppano discussioni, si intessono relazioni, ci si confronta sui vari temi, si scambiano opinioni, avendo in genere sufficiente tempo per trattare i vari arg…

Il credito cooperativo negli anni della crisi

2015

Per migliorare la comprensione del ruolo giocato dalle banche di credito cooperativo nel corso della crisi e per valutare le strategie adottate dalle BCC per ridurre i propri svantaggi è, quindi, utile un’analisi più articolata a livello territoriale delle informazioni già proposte a livello nazionale. Le domande a cui si cercherà di rispondere sono: risultano di erenze spaziali e tem- porali dell’impatto della crisi globale sull’evoluzione dei crediti alla clientela (imprese e famiglie) e dei crediti deteriorati (non performing) delle BCC? Dopo l’irrompere della crisi iniziata nel 2007, vi sono stati cambiamenti nelle relazioni tra le BCC e i loro clienti? E in quale direzione?

Las fronteras valencianas durante la guerra con Castilla (1429-1430)

1987

NOS PROPONEMOS EN EL PRESENTE TRABAJO UNA INCURSION EN ESE CONFLICTO POCO CONOCIDO EN NUESTRA HISTORIOGRAFIA, QUE FUE LA GUERRA ENTRE CASTILLA Y ARAGON DE 1429-1430. EL PRINCIPAL ESCENARIO DE LA LUCHA FUE LA FRONTERA TERRESTRE, DESDE EL RINCON DE ADEMUZ A ORIHUELA, SIENDO LAS CORRERIAS Y GOLPES DE MANO LA TACTICA MILITAR HABITUAL, CON GRAVES EFECTOS NEGATIVOS PARA LA POBLACION Y LA ECONOMIA DEL TERRITORIO FRONTERO VALENCIANO. (A)

Framing Caesarean Section Reduction Policies Through a Dynamic Performance Management Approach: A Maternity Pathway Case-Based Analysis

2017

The World Health Organization since the last three decades strongly encourages countries to reduce the caesarean section (CS) rate down to 10–15%. However, this goal nowadays appears still far from its achievement. Public decision-makers are indeed struggling to design and implement effective policies to reduce the CS rate. The literature provides a wide range of factors causing a change in the CS rate, such as the patient clinical profile and the healthcare service quality provided. Maternity pathway (MP) is considered a mean through which to standardize the cares and to reduce CSs. This study investigates the MP recently introduced in Sicilian local health authorities. Based on such an an…

Low preoperative cholesterol level is a risk factor of sepsis and poor clinical outcome in patients undergoing cardiac surgery with cardiopulmonary b…

2014

Systemic inflammatory response syndrome and sepsis frequently occur after cardiac surgery with cardiopulmonary bypass. The aim of the present study was to investigate whether preoperative cholesterol levels can predict sepsis onset and postoperative complications in patients undergoing cardiac surgery with cardiopulmonary bypass.Prospective observational study.Surgical ICU of a French university hospital.Two hundred and seventeen consecutive patients older than 18 years admitted for planned cardiac surgery with cardiopulmonary bypass.Measurements of plasma blood lipids and inflammation markers before anesthesia induction (baseline), at cardiopulmonary bypass start, at cardiopulmonary bypass…