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Search Results: 1 - 10 of 22583 matches for " Eduardo; Sola "
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Recentraliza??o/descentraliza??o: dinamica do regime federativo no Brasil dos anos 90
Kugelmas, Eduardo;Sola, Lourdes;
Tempo Social , 1999, DOI: 10.1590/S0103-20701999000200005
Abstract: this article discusses the evolution of the federative practice and institutions in brazil in the past few years, emphasizing the simultaneity of the decentralization processes. the decentralizing trajectory which culminates in the 1988 constitution, the fiscal crises of the brazilian state and the effects of plano real are discussed based in a set of comparative references, trying to incorporate very recent works by alfred stepan.
Maximal rationally connected fibrations and movable curves
Luis Eduardo Sola Conde,Matei Toma
Mathematics , 2008,
Abstract: A well known result of Miyaoka asserts that a complex projective manifold is uniruled if its cotangent bundle restricted to a general complete intersection curve is not nef. Using the Harder-Narasimhan filtration of the tangent bundle, it can moreover be shown that the choice of such a curve gives rise to a rationally connected foliation of the manifold. In this note we show that, conversely, a movable curve can be found so that the maximal rationally connected fibration of the manifold may be recovered as a term of the associated Harder-Narasimhan filtration of the tangent bundle.
Holomorphic Engel Structures
Francisco Presas,Luis Eduardo Sola Conde
Mathematics , 2008,
Abstract: Recently there has been renewed interest among differential geometers in the theory of Engel structures. We introduce holomorphic analogues of these structures, and pose the problem of classifying projective manifolds admitting them. Besides providing the basic properties of these varieties, we present two series of examples and characterize them by certain positivity conditions on the Engel structure.
Tangential projections and secant defective varieties
Roberto Munoz,Jose Carlos Sierra,Luis Eduardo Sola Conde
Mathematics , 2007,
Abstract: Going one step further in Zak's classification of Scorza varieties with secant defect equal to one, we characterize the Veronese embedding of $\P^n$ given by the complete linear system of quadrics and its smooth projections from a point as the only smooth irreducible complex and non-degenerate projective subvarieties of $\P^N$ that can be projected isomorphically into $\P^{2n}$ when $N\geq\binom{n+2}{2}-2$.
Projective generation and smoothness of congruences of order 1
Manuel Pedreira-Perez,Luis-Eduardo Sola-Conde
Mathematics , 2000,
Abstract: In this paper we give the projective generation of congruences of order 1 of r-dimensional projective spaces in P^N from their focal loci. In a natural way, this construction shows that the corresponding surfaces in the grassmannian are the Veronese surface, and rational ruled surfaces eventually with singularities. We characterize when these surfaces are smooth, recovering and generalizing a Ziv Ran's result.
Classification of Plane Congruences in P4(C) (II)
Manuel Pedreira-Perez,Luis-Eduardo Sola-Conde
Mathematics , 1999,
Abstract: We study second order focal loci of nondegenerate plane congruences in P4(C) with degenerate focal conic. We show the projective generation of such congruences when the second order focal locus fills a component of the focal conic, improving a result of Corrado Segre
Classification of Plane Congruences in P4(C) (I)
Manuel Pedreira-Perez,Luis-Eduardo Sola-Conde
Mathematics , 1999,
Abstract: Nondegenerate plane congruences in the four-dimensional complex projective space with degenerate general focal conic are classified by using the focal method due to Corrado Segre.
Money Supply and Inflation in Nigeria: Implications for National Development  [PDF]
Olorunfemi Sola, Adeleke Peter
Modern Economy (ME) , 2013, DOI: 10.4236/me.2013.43018
Abstract:

The study examines money supply and inflation rate in Nigeria. Secondary data that ranged between 1970-2008 were sourced from the CBN Statistical Bulletin. The study used Vector Auto Regressive (VAR) model. The stationary properties of the model were also explored. The results revealed that money supply and exchange rate were stationary at the level while oil revenue and interest rate were stationary at the first difference. Results from the causality test indicate that there exists a unidirectional causality between money supply and inflation rate as well as interest rate and inflation rate. The causality test runs from money supply to inflation, from the interest rate to inflation and from interest rate to money supply. The paper concludes that government should use the level of inflation as an operational guide in measuring the effectiveness of its monetary policy.

Extrahippocampal Desynchronization in Nonlesional Temporal Lobe Epilepsy
Jesús Pastor,Eduardo G. Navarrete,Rafael G. Sola,Guillermo J. Ortega
Epilepsy Research and Treatment , 2012, DOI: 10.1155/2012/823683
Abstract: Although temporal lobe epilepsy (TLE) is traditionally associated with both hypersynchronous activity in the form of interictal epileptic discharges and hippocampal sclerosis, recent findings suggest that desynchronization also plays a central role in the dynamics of this pathology. The objective of this work is to show the imbalance existing between mesial activities in patients suffering from mesial TLE, with normal mesial structures. Foramen ovale recordings from six patients with mesial TLE and one with lateral TLE were analyzed through a cluster analysis and synchronization matrices. None of the patients present findings in the MRI presurgical evaluation. Numerical analysis was carried out in three different situations: awake and sleep interictal and also during the preictal stage. High levels of desynchronization ipsilateral to the epileptic side were present in mesial TLE patients. Low levels of desynchronization were present in the lateral TLE patient during the interictal stage and almost zero in the preictal stage. Implications of these findings in relation with seizure spreading are discussed. 1. Introduction Temporal lobe epilepsy (TLE) is the most common form of focal epilepsy, where the epileptogenic area is located at some part of the temporal lobe. Mesial TLE (MTLE) refers to those cases where the suspected source of epileptogenic activity is located in the mesial area of the temporal lobe [1], and lateral TLE (LTLE), instead, where the focus is located in the lateral side. MTLE is often associated with structural lesions and/or functional deficiency in one or several (dual pathology) mesial structures of the temporal lobe, with hippocampal sclerosis (HS) as the most common underlying abnormality [2]. However, pathological findings of damage in the amygdala and parahippocampal region, which in turn is subdivided into the entorhinal cortex (EC), perirhinal cortex (PC), and parahippocampal cortex (PPC), are also reported [3, 4]. A significant minority of MTLE patients have no pathological findings on magnetic resonance imaging (MRI), even though lateralization may be correctly performed by neurophysiological methods [5, 6]. Normal underlying mesial structures play a key role in our understanding of the pathogenesis of MTLE, as they oblige us to ask whether mesial sclerosis (MS) is either the cause or the effect in MTLE [7]. Pathophysiology in MTLE can be explained according to two models: (1) the “focal” model suggests that a single pathological region in the mesial temporal lobe is responsible for seizure origin, establishing a link
Risk factors for catheter-related bloodstream infection: a prospective multicenter study in Brazilian intensive care units
Bicudo, Daniela;Batista, Ruth;Furtado, Guilherme Henrique;Sola, Angela;Medeiros, Eduardo Alexandrino Servolo de;
Brazilian Journal of Infectious Diseases , 2011, DOI: 10.1590/S1413-86702011000400005
Abstract: introduction: central venous catheters (cvc) are devices of great importance in health care. the advantages gained from the use of catheters outweigh the complications that might result from their use, among which bloodstream infections (bsi). in spite of its importance, few national studies have addressed this issue. objective: the aim this study was to determine the incidence of bsi in patients with cvc, hospitalized in icu, as well as the variables associated with this complication. methods: multicentric cohort study carried out at icus of three hospitals at universidade federal de s?o paulo complex. results: a total of 118 cases of bsi in 11.546 catheters day were observed: 10.22 bsi per 1,000 catheters day. on average, bsi was associated to seven additional days of hospital stay in our study (p < 0.001), with a significant difference between types of catheters. concerning the place of insertion, there was no statistical difference in bsi rates. conclusion: we concluded that a patient who uses a catheter for longer than 13 days presents a progressive risk for infection of approximately three times higher in relation to a patient who uses the catheter for less than 13 days (p < 0.001). the median duration of catheter use was 14 days among patients with bsi and 9 days in patients without infection (p < 0.001). there was higher prevalence of gram-negative infections. the risk factors for bsi were utilization of multiple-lumen catheters, duration of catheterization and icu length of stay.
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