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Search Results: 1 - 10 of 208730 matches for " L. Grandi "
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Estimación de la edad gestacional: Revisión de la literatura
Carlos Grandi,Fernando López
Revista del Hospital Materno Infantil Ramón Sardá , 2004,
Abstract: La estimación de la edad gestacional (EG) prenatal es un punto crítico en la toma de decisiones obstétricas así como para la evaluación pronóstica postnatal. Cuando no se tiene acceso al ultrasonido durante la primera mitad del embarazo, si la fecha de la última menstruación (FUM) es confiable y los ciclos son de 28 días, la estimación de la EG por FUM sigue siendo útil en la práctica, a pesar de presentar errores aleatorios y sistemáticos. No se ha demostrado que la estimación de la EG utilizando mediciones rutinarias por ultrasonografía precoz en poblaciones de bajo riesgo sea beneficioso para la salud materna y los resultados perinatales. La EG es sistemáticamente sobreestimada cuando se calcula únicamente por FUM, con el consiguiente sesgo de disminución de la incidencias de prematurez y aumento de la incidencia de RN de postérmino, además de disminuir la tasa de PEG. Por el contrario, una estimación por ultrasonografía disminuye el PN en cortas gestaciones y la aumenta en los embarazos de postérmino, con los consiguientes sesgos de aumento en las tasa de prematurez y disminución de los RN de postérmino. El reemplazo de la EG por FUM por la EG por US afectaría la comparación de tasas específicas de Mortalidad Infantil por Edad Gestacional y las curvas fetales de crecimiento basados en el peso para la edad gestacional, además de menos interrupciones de embarazos de pretérmino y menos inducciones por postérmino
Evaluación de la severidad, proporcionalidad y riesgo de muerte de recién nacidos de muy bajo peso con restricción del crecimiento fetal: análisis multicéntrico sudamericano
Grandi, Carlos;Tapia, José L.;Marshall, Guillermo;,;
Jornal de Pediatria , 2005, DOI: 10.1590/S0021-75572005000400005
Abstract: objectives: to evaluate the clinical severity and proportionality of small for gestational age, very low birth weight neonates (< 1,500 g) and to estimate the neonatal mortality risk associated with the condition of being small for gestational age according to the degree of severity and proportionality. methods: observational design. all of the neocosur collaborative group's very low birth weight infants (25-36 weeks' gestation) were included (n = 1,518). anthropometric indices: birth weight < 3rd and 10th percentile. severity (fetal growth ratio = observed weight/mean birth weight for gestational age); no growth restriction: fetal growth ratio 0.90-1.10, mild: fetal growth ratio 0.80-0.89, moderate: fetal growth ratio 0.75-0.79 and severe: fetal growth ratio < 0.75. proportionality: coefficient of bimodality and z score for ponderal index (pi = g/cm3 *100). neonatal mortality until discharge. results: < 3rd percentile: 13.5% (p < 0.001); < 10th percentile: 31% (p < 0.001); fetal growth ratio: 0.90±0.21 (p < 0.001), mild restriction: 20.8%, moderate restriction: 8.7% and severe restriction: 32.6%. coefficient of bimodality: 0.53; pi z score < -1: 8%. maternal hypertensive disease was systematically associated with being small for gestational age (aor 1.20, 95% ci 0.86-1.67), fetal growth ratio < 0.89 (aor 1.71, 1.24-2.36) and pi z score < -1 (aor 1.60, 1.03-2.41). adjusted odds ratios for neonatal mortality were: 2.64 (95% ci 1.71-3.92) for being small for gestational age, 2.76 (95% ci 1.85-4.10) for fetal growth ratio < 0.89, and 1.37 (95% ci 0.80-2.32) for z score pi < -1. conclusions: small for gestational age, mostly symmetric and severe restriction is a frequent condition in < 1,500 g neonates and is associated with higher mortality rates.
BeppoSAX Observations of the Radio Galaxy Centaurus A
P. Grandi,C. M. Urry,L. Maraschi
Physics , 1999, DOI: 10.1016/S0273-1177(99)00784-X
Abstract: We present preliminary results from two observations of the radio galaxy Centaurus A performed by the BeppoSAX satellite. We did not detect any spectral variation of the nuclear continuum in spite of the long-term flux change (by a factor 1.3) between the two observations. At both epochs, the nuclear point-like emission was well fitted with a strongly absorbed power law with an exponential cutoff at high energies (E_cutoff>200 keV). We also observed a significant flux variation of the iron line between the two observations. The flux of the line and of the continuum changed in the opposite sense. The line is more intense at the first epoch, when the nuclear source was at the lower intensity level. The implied delay between the continuum and line variations strongly suggests that the cold material responsible for the iron line production is not located very near to the primary X-ray source. There is also evidence that the line profile changed between the two epochs, being broader and slightly blueshifted when the source was fainter. It is possible that the emission feature is a blend of cold and ionized iron lines produced in separate regions surrounding the nuclear source.
A macroscale, phase-field model for shape memory alloys with non-isothermal effects: influence of strain-rate and environmental conditions on the mechanical response
D. Grandi,M. Maraldi,L. Molari
Physics , 2011,
Abstract: A Ginzburg-Landau model for the macroscopic behaviour of a shape memory alloy is proposed. The model is one-dimensional in essence, in that we consider the effect of the martensitic phase transition in terms of a uniaxial deformation along a fixed direction and we use a scalar order parameter whose equilibrium values describe the austenitic phase and the two martensitic variants. The model relies on a Ginzburg-Landau free energy defined as a function of macroscopically measurable quantities, and accounts for thermal effects; couplings between the various relevant physical aspects are established according to thermodynamic consistency. The theoretical model has been implemented within a finite-element framework and a number of numerical tests are presented which investigate the mechanical behaviour of the model under different conditions; the results obtained are analysed in relation to experimental evidences available in literature. In particular, the influence of the strain-rate and of the ambient conditions on the response of the model is highlighted.
Un Cluster ad alte prestazioni per il progetto AMS
P. Bobik,Matteo Boschini,L. Carbone,D. Grandi
Bollettino del CILEA , 2002, DOI: 10.1472/bc.v85inovembre.1133
Abstract: Viene presentato lo sviluppo di un cluster ad architettura PC Linux per calcolo ad alte prestazioni nell'ambito del progetto AMS.
Supersymmetric Dirac-Born-Infeld theory in noncommutative space
N. Grandi,R. L. Pakman,F. A. Schaposnik
Physics , 2000, DOI: 10.1016/S0550-3213(00)00498-3
Abstract: We present a supersymmetric version of Dirac-Born-Infeld (DBI) theory in noncommutative space-time, both for Abelian and non-Abelian gauge groups. We show, using the superfield formalism, that the definition of a certain ordering with respect to the * product leads naturally to a DBI action both in the U(1) as well as in the U(N) case. BPS equations are analysed in this context and properties of the resulting theory are discussed.
Monopoles, Dyons and Theta Term in Dirac-Born-Infeld Theory
N. Grandi,R. L. Pakman,F. A. Schaposnik,G. Silva
Physics , 1999, DOI: 10.1103/PhysRevD.60.125002
Abstract: We present dyon solutions to an SU(2) Dirac-Born-Infeld (DBI) gauge theory coupled to a Higgs triplet. We consider different non-Abelian extensions of the DBI action and study the resulting solutions numerically, comparing them with the standard Julia-Zee dyons. We discuss the existence of a critical value of $\beta$, the Born-Infeld absolute field parameter, below which the solution ceases to exist. We also analyse the effect of modifying the DBI action so as to include the analogous of the $\theta$ term, showing that Witten formula for the dyon charge also holds in DBI theories.
High Energy Results from BeppoSAX
R. Fusco-Femiano,D. Dal Fiume,M. Orlandini,S. De Grandi,S. Molendi,L. Feretti,P. Grandi,G. Giovannini
Physics , 2002,
Abstract: We review all the BeppoSAX results relative to the search for additional nonthermal components in the spectra of clusters of galaxies. In particular, our MECS data analysis of A2199 does not confirm the presence of the nonthermal excess reported by Kaastra et al. (1999). A new observation of A2256 seems to indicate quite definitely that the nonthermal fluxes detected in Coma and A2256 are due to a diffuse nonthermal mechanism involving the intracluster medium. We report marginal evidence (~3\sigma) for a nonthermal excess in A754 and A119, but the presence of point sources in the field of view of the PDS makes unlikely a diffuse interpretation.
Estimación del acuerdo entre dos métodos para medición clínica de la edad gestacional
Archivos argentinos de pediatr?-a , 2006,
Abstract: introduction. in the clinical practice, a new method frequently can only be assessed by means of its comparison against other established techniques (gold standard). the objective of the present work was to describe an approach -through graphical techniques and simple statistical calculations- to assess the agreement level between two methods for clinical measurement of gestational age and to determine if they are interchangeable. population, material and methods. this is an observational cohort study. between 2000 and 2001, 137 pregnant women were prospectively enrolled at the hospital materno-infantil ramón sardá of buenos aires before the 16th week of gestation. the last normal menstrual period and ultrasound scan measurements were used for estimating gestational age. mean difference, standard deviation and 95% confidence interval (limits of agreement) between the methods, and the mean of the two measurements were calculated and plotted for each case. results. mean gestational age at the first ultrasound scan was 19.6 (sd 4.9; 95% ci 18.7-20.4) weeks. the agreement between both methods were 71.5% (95% ci 63-78) ± 10 weeks and 82.5% (95% ci 75-87) ± 2 weeks. mean difference was 0.35 + 1.89 (95% ci 0.03-0.67) weeks and the limits of agreement showed that, independently of gestational age, differences reached 7.5 weeks. conclusions. the estimation of gestational age by the last normal menstrual period overestimated the one estimated ultrasound scan ("gold standard") by 25% and underestimated it by 20%. in the clinical practice both methods are not interchangeable.
Outside the margin. Metaphors of disability and integration in the recent literature for children. Fuori dal margine Metafore di disabilità e di integrazione nella recente letteratura per l’infanzia
William Grandi
Ricerche di Pedagogia e Didattica , 2012,
Abstract: The article investigates recent Children’s Literature, in order to find out metaphors and references about disabled people. Documentation on this issue is so abundant that only the most considerable tales and writers was analyzed: for instance, Neil Gaiman, Roald Dahl, Silvana Gandolfi and many other writers dedicated some of their books to characters with physical disabilities, dyslexia, autism. This research shows that Children’s Literature can enable children and grown-up people not only to know disabilities, but also to start up social integration of disabled person. L’articolo esamina la recente Letteratura, per l’Infanzia per scoprire metafore e allusioni sulle persone con disabilità. La documentazione su tale questione è così abbondante che sono stati analizzati solo i più significativi racconti e scrittori: per esempio, Neil Gaiman, Roald Dahl, Silvana Gandolfi e molti altri autori hanno dedicato alcuni dei loro libri a personaggi con disabilità fisiche, dislessia o autismo. Questa ricerca mostra che la Letteratura per l’Infanzia può consentire ai ragazzi e agli adulti non solo di conoscere le disabilità, ma pure di avviare l’integrazione sociale della persona disabile.
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