Search results for "Autor"
showing 10 items of 820 documents
Firm Size and Volatility Analysis in the Spanish Stock Market
2011
In this article, three strongly related questions are studied. First, volatility spillovers between large and small firms in the Spanish stock market are analyzed by using a conditional CAPM with an asymmetric multivariate GARCH-M covariance structure. Results show that there exist bidirectional volatility spillovers between both types of firms, especially after bad news. Second, the volatility feedback hypothesis explaining the volatility asymmetry feature is investigated. Results show significant evidence for this hypothesis. Finally, the study uncovers that conditional beta coefficient estimates within the used model are insensitive to sign and size asymmetries in the unexpected shock re…
The impact of economic and policy uncertainty shocks in Spain
2020
The purpose of this research is to quantify the impact of economic uncertainty shocks in Spain by using a structural vector autoregression (SVAR) approach with data from the first quarter of 2001 u...
Update on mechanism and therapeutic implications of spinal cord stimulation and cerebral hemodynamics: A narrative review
2017
Spinal cord stimulation (SCS) is well known for its early role in the management of chronic pain, mainly failed back surgery syndrome (FBSS), spasticity, and bowel and bladder dysfunction. In more recent years, SCS has been proposed for patients suffering from refractory angina or peripheral vasculopathies in order to gain symptom relief, thus indicating some hemodynamic effect on the peripheral circulation. Taking into account this scientific observation, since the late1980s, researchers have started to investigate the potential effect of SCS on cerebral blood flow (CBF) regulation and its possible application in certain pathological settings dealing with vascular pattern dysfunction, such…
Use of middle cerebral velocity and blood pressure for the analysis of cerebral autoregulation at various frequencies: The coherence index
1998
A common component in many protocols for the evaluation of cerebral autoregulation is the comparison of transcranial Doppler ultrasound (TCD) velocities with blood pressure recordings, in which correlations between these two signals correspond to impaired autoregulation. With long data sets and complicated paradigms, however, visual inspection alone cannot adequately distinguish random coincidence from consistent correlation in a statistically valid fashion. We suggest and illustrate the use of the coherence index for this purpose. To illustrate this technique, long-term recordings of TCD velocity and blood pressure were obtained from 6 normal subjects and using 23 data segments from 8 pati…
Voice and authorial body in Juana Manso
2021
El estilo de Juana Manso fue calificado por Sarmiento como «escandaloso». Esa manera inequívoca de presentarse públicamente delimitó desde entonces un modo de existencia, de circulación y de funcionamiento de su figura autorial en el campo cultural argentino de mediados de siglo XIX. Este artículo se propone rastrear esta singular «puesta en escena» de la escritora como un dispositivo de enunciación que no se limita a sus textos, en la doble dimensión que ocupa, como autora y como actora de ese campo. ¿Cómo se construye, en esta puesta escena, su voz y su imagen?, ¿Cómo se difunde ese cuerpo de autora? En la conjunción de género y profesión, la función-Manso se concreta en un tono de escrit…
Inhibition of B2 receptor internalization delays its dephosphorylation
1997
Studies on sea urchin oocytes. II. Synthesis of RNA during oogenesis.
1972
Abstract Isolated oocytes of the sea urchin Paracentrotus lividus actively incorporate 3H-uridine into RNA. Labeled RNA was analysed by sucrose gradient and acrylamide gel electrophoresis following cell fractionation. Much of the radioactivity is incorporated at the nucleolar level in the form of rRNA precursors. The kinetics of maturation of these latter suggests that this occurs at a slower rate than during embryogenesis. Other non-nucleolar RNA classes are also actively labelled and retained in the nucleus for many hours. These results are confirmed by an autoradiographic investigation.
An identifiable model to assess frequency-domain Granger causality in the presence of significant instantaneous interactions
2010
We present a new approach for the investigation of Granger causality in the frequency domain by means of the partial directed coherence (PDC). The approach is based on the utilization of an extended multivariate autoregressive (MVAR) model, including instantaneous effects in addition to the lagged effects traditionally studied, to fit the observed multiple time series prior to PDC computation. Model identification is performed combining standard MVAR coefficient estimation with a recent technique for instantaneous causal modeling based on independent component analysis. The approach is first validated on simulated MVAR processes showing that, in the presence of instantaneous effects, only t…
Autoroutes, activités et territoires: propositions méthodologiques pour évaluer l'impact de l'autoroute sur la spatialisation des activités
2003
International audience; L'autoroute est-elle capable de fixer les activités ? Cette question relativement simple, ancienne etcontroversée, posée par la Société des Autoroutes Paris-Rhin-Rhône n'a toujours pas été résolue malgrél'acceptation d'une logique d'interactions primant sur une logique d'effets automatiques d'un seul élément. Ellese heurte essentiellement à un blocage méthodologique qui empêche, en l'état actuel des recherches, d'yrépondre de manière plus rigoureuse et d'exporter des conclusions validées dans tous les cas. Aussi, nousproposons une nouvelle méthode de recherche qui intègre la totalité du système de localisation des activités etune nouvelle conception de recherche qui …
Incorporazione non riduttiva ed autoreferenzialità causale. Note per una concezione realista del sé nella teoria della coscienza di Antonio Damasio e…
2008
La critica al sostanzialismo ed al solipsismo cartesiani e l'elaborazione di una concezione naturalista ed antisostanzialista della mente hanno storicamente comportato, da David hume al funzionalismo ed alle scienze cognitive contemporanee, l'affermarsi di un atteggiamento eliminativista nei confronti del sè quale si dà ad esempio nella "narrative view" di Daniel Dennett e nella teoria della mente estesa di David Chalmers ed Andy Clark. Scopo di questo saggio è argomentare che la connessione essenziale tra mente e individualità può sopravvivere alla crisi del paradigma cartesiano mediante una rilettura del sè come processo causalmente reale e biologicamente incorporato quale si evince dalla…