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Now showing items 1 - 16 of 1149

  • 41. Age effect on intraoperative motor evoked potentials in children

    Costa, P.   Giobbe, M.L.  

    Although intraoperative Motor Evoked Potentials (MEPs) are routinely used in pediatric population in order to prevent jatrogenic neurologic sequelae, studies on the effect of age on m-MEPs in children are still sparse. In this retrospective study, data from 116 procedures in 102 children (mean age 8.1 ± 4.5 yrs undergoing neurosurgical or orthopedic procedures (37 spinal – 31.9% –, 68 posterior fossa – 55.6% – and 11 supratentorial – 9.52% –) are shown. We reviewed the stimulus intensity (expressed as stimulator output percentage) required to achieve a robust MEP from the aductor pollicis brevis (ABP). It has been possible to obtain responses from the ABP in all subjects. An inverse correlation between increasing age and stimulus intensity has been found in the first decade of life (R −0.437; p < 0.01). Young children (<5 yrs) required stronger stimulus intensity (43.9% ± 15.9) compared to patients > of 5 yrs (31.6% ± 10.9; t 4.432; p < 0.001). No patient experienced any transcranial electrical stimulation complications. This study confirm the feasibility of MEPs even in young children and the association between age and MEPs threshold. High stimulation intensities needed to produce MEP responses in younger patients may reflect immaturity of their motor pathways.
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  • Proposal of a new real-time cooperative challenge in mobile robotics

    Costa, P.   Moreira, A.   Gon?alves, J.   Lima, J.  

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    Bica, I.   Cunha, M.   Costa, J.   Rodrigues, V.   Costa, P.  

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  • Effects of Stretching on Peak Torque and the H?:?Q Ratio

    Costa, P.   Ryan, E.   Herda, T.   DeFreitas, J.   Beck, T.   Cramer, J.  

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  • Thermodynamics and critical behavior in the Nambu–Jona-Lasinio model of QCD

    Costa, P.   Ruivo, M. C.   de Sousa, C. A.  

    We investigate the phase diagram of strongly interacting matter as a function of temperature and baryonic density/chemical potential, within Nambu-Jona-Lasinio type models. We perform a systematic study concerning the existence, location, and properties of a critical end point/tricritical point, both in SU(2) and SU(3) versions of the model. We verify that, for m u=m d=0 and up to a critical strange quark mass, there is a tricritical point, which becomes a critical end point in a world with realistic values of the current quark masses. The properties of physical observables, such as the baryon number susceptibility and the specific heat, are analyzed in the vicinity of the critical end point, with special focus on their critical exponents. The behavior of mesons in the T-mu B(rho B) plane is analyzed in connection with possible signatures of partial and effective restoration of chiral symmetry.
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  • The QCD critical end point in the PNJL model

    Costa, P.   de Sousa, C. A.   Ruivo, M. C.   Hansen, H.  

    We investigate the role played by the Polyakov loop in the dynamics of the chiral phase transition in the framework of the so-called Polyakov-Nambu-Jona-Lasinio (PNJL) model in the SU(2) sector. We present the phase diagram where the inclusion of the Polyakov loop moves the critical points to higher temperatures, compared with the Nambu-Jona-Lasinio model results. The critical properties of physical observables, such as the baryon number susceptibility and the specific heat, are analyzed in the vicinity of the critical end point, with special focus on their critical exponents. The results with the PNJL model are closer to lattice results and we also recover the universal behavior of the critical exponents of both the baryon susceptibility and the specific heat. Copyright (c) EPLA, 2009
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  • 33. The role of intraoperative neurophysiology in scoliosis surgery

    Costa, P.   Borio, A.   Marmolino, S.   Mogno, M.   Serpella, D.   Girardo, M.   Di Ruocco, C.   Cinnella, P.   Aleotti, S.  

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  • Effects of the regularization on the restoration of chiral and axial symmetries

    Costa, P.   Ruivo, M. C.   de Sousa, C. A.  

    The effects of a type of regularization for finite temperatures on the restoration of chiral and axial symmetries are investigated within the SU(3) Nambu-Jona-Lasinio model. The regularization consists in using an infinite cutoff in the integrals that are convergent at finite temperature, a procedure that allows one to take into account the effects of high momentum quarks at high temperatures. It is found that the critical temperature for the phase transition is closer to lattice results than the one obtained with the conventional regularization, and the restoration of chiral and axial symmetries, signaled by the behavior of several observables, occurs simultaneously and at a higher temperature. The restoration of the axial symmetry appears as a natural consequence of the full recovering of the chiral symmetry that was dynamically broken. By using an additional ansatz that simulates instanton suppression effects, by means of a convenient temperature dependence of the anomaly coefficient, we found that the restoration of U(2) symmetry is shifted to lower values, but the dominant effect at high temperatures comes from the new regularization that enhances the decrease of quark condensates, especially in the strange sector.
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  • Predictors of Nonelective Removal of Peripherally Inserted Central Catheters in Infants

    Costa, P.   Kimura, A. F.   Brandon, D. H.   Damiani, L. P.  

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  • PET imaging using titanium-45: Could it be useful?

    Costa, P.   Metello, L.F.   Alves, F.   Naia, M. Duarte  

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  • Socially-aware routing for publish-subscribe in delay-tolerant mobile ad hoc networks

    Costa, P.   Mascolo, C.   Musolesi, M.   Picco, G.P.  

    Applications involving the dissemination of information directly relevant to humans (e.g., service advertising, news spreading, environmental alerts) often rely on publish-subscribe, in which the network delivers a published message only to the nodes whose subscribed interests match it. In principle, publish- subscribe is particularly useful in mobile environments, since it minimizes the coupling among communication parties. However, to the best of our knowledge, none of the (few) works that tackled publish-subscribe in mobile environments has yet addressed intermittently-connected human networks. Socially-related people tend to be co-located quite regularly. This characteristic can be exploited to drive forwarding decisions in the interest-based routing layer supporting the publish-subscribe network, yielding not only improved performance but also the ability to overcome high rates of mobility and long-lasting disconnections. In this paper we propose SocialCast, a routing framework for publish-subscribe that exploits predictions based on metrics of social interaction (e.g., patterns of movements among communities) to identify the best information carriers. We highlight the principles underlying our protocol, illustrate its operation, and evaluate its performance using a mobility model based on a social network validated with real human mobility traces. The evaluation shows that prediction of colocation and node mobility allow for maintaining a very high and steady event delivery with low overhead and latency, despite the variation in density, number of replicas per message or speed.
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  • Prise en charge des prolapsus génito-urinaires

    Costa, P.   Delmas, V.   Haab, F.  

    La prise en charge chirurgicale des prolapsus génito-urinaires s’est considérablement modifiée au cours de ces dernières années. Dorénavant, de nombreuses options chirurgicales sont disponibles pour proposer une option thérapeutique efficace pour prendre en charge les différentes situations cliniques. L’indication du traitement chirurgical repose sur l’analyse précise de la plainte fonctionnelle et de la lésion anatomique pelvienne. Le traitement proposé doit prendre en compte tous les aspects de la pathologie. Cependant, l’analyse de la littérature montre encore des insuffisances lorsqu’il s’agit de comparer les techniques entre elles. Summary Surgical treatment of genitourinary prolapse has changed considerably over the last few years. Now numerous surgical options are available offering efficient therapeutic solutions to treat different clinical situations. The type of surgical treatment depends on the precise analysis of the functional complaint and of anatomical pelvic lesions. The proposed treatment must take all aspects of the pathology into account. However, a review of existing research shows that there are still improvements to be made when it comes to comparing different techniques with one another.
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  • On ‘creative cities’ governance models: a comparative approach

    Costa, P.   Magalh?es, M.   Vasconcelos, B.   Sugahara, G.  

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  • Identification of new breakpoints in AZFb and AZFc

    Costa, P.   Goncalves, R.   Ferras, C.   Fernandes, S.   Fernandes, A. T.   Sousa, M.   Barros, A.  

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  • symmetry breaking and restoration effects on the scalar-pseudoscalarmeson spectrum

    Costa, P.   Ruivo, M. C.   de Sousa, C. A.   Kalinovsky, Yu. L.  

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  • Quality of Life in Spinal Cord Injury Patients with Urinary Difficulties

    Costa, P.   Costa, P.   Perrouin-Verbe, B.   Perrouin-Verbe, B.   Colvez, A.   Colvez, A.   Didier, J.P.   Didier, J.P.   Marquis, P.   Marquis, P.   Marrel, A.   Marrel, A.   Amarenco, G.   Amarenco, G.   Espirac, B.   Espirac, B.   Leriche, A.   Leriche, A.  

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