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Search Results: 1 - 10 of 515589 matches for " Nora I. Pe?a "
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Clave de los hongos marinos filamentosos de la provincia de Buenos Aires, Argentina
Nora I. Pea
Darwiniana , 2000,
Abstract: Pe a, N. I. 2000. Clave de los hongos marinos filamentosos de la Provincia de Buenos Aires,Argentina. Darwiniana 38(3-4): 291-298.En la presente contribución se suministra una clave dicotómica que incluye la totalidad de loshongos marinos filamentosos (30 Ascomycotina, 6 Deuteromycotina y 1 Basidiomycotina) citados hastala actualidad en la provincia de Buenos Aires, que asimismo son las únicas especies de hongos marinoscitados para Argentina. Las características de los propágulos son consideradas como el principal criteriopara la identificación de las especies estudiadas. Todos los taxones son ilustrados mediante dibujos deascosporas, basidiosporas y conidios
Robust estimation for ARMA models
Nora Muler,Daniel Pea,Víctor J. Yohai
Mathematics , 2009, DOI: 10.1214/07-AOS570
Abstract: This paper introduces a new class of robust estimates for ARMA models. They are M-estimates, but the residuals are computed so the effect of one outlier is limited to the period where it occurs. These estimates are closely related to those based on a robust filter, but they have two important advantages: they are consistent and the asymptotic theory is tractable. We perform a Monte Carlo where we show that these estimates compare favorably with respect to standard M-estimates and to estimates based on a diagnostic procedure.
A Ground Penetrating Radar and Electrical Resistivity Tomography Prospection for Detecting Sterile Bodies in the Phosphatic Bearing of Sidi Chennane (Morocco)  [PDF]
Nora El Assel, Azzouz Kchikach, Teresa Teixidó, José Antonio Pea, Mohammed Jaffal, Roger Guerin, Pascale Lutz, Es-Said Jourani, Mbarek Amaghzaz
International Journal of Geosciences (IJG) , 2011, DOI: 10.4236/ijg.2011.24044
Abstract: In Sidi Chennane deposits (Morocco), the phosphatic series is composed of regular interbedded phosphatic and marly limestone layers. Exploitation of the phosphate in these deposits collides frequently with problems bound to the existence, in this series, of sterile bodies qualified as derangements. They cause two kinds of problems: 1) as they are hard, compact and masked by a Quaternary cover, they disturb the exploitation in some yards and give bad reserve calculation; 2) even the use of wells and mechanical boreholes did not evidence their delimitation. Our study shows that these bodies can be detected and delimited using ground penetrating radar and electrical resistivity tomography methods. It is based on the acquisition and the interpretation of series tests using these methods carried out above visible sterile bodies in a trench of exploitation in order to have geologically valid information. The article concerns to the analysis of the results and of the proceeding for a possible large geophysics survey.
The Operant Conditioning of Letter String Problem Solving
Pulido, Marco A.;Hernández, Cindy;Pea, Lilian M.;Ponce, Nora M.;Rebolledo, Montserrat;
Revista mexicana de análisis de la conducta , 2010, DOI: 10.5514/rmac.v36.i3.04
Abstract: the major purpose of the present study was to assess the effects of practice and reinforcement on letter string problem solving. college students were exposed to printed letter string problems. in the first experiment correct answers could be reinforced, punished, ignored, randomly reinforced or presented without a previous example. data showed punishment significantly decreased the number of correct answers produced by the subjects; additionally practice significantly increased the number of correct answers in one reinforced condition and lowered the number of correct answers in the punishment group. a second experiment assessed behavioral momentum theory in the solution of letter string problems. subjects were reinforced for producing a determined answer during 12 consecutive problems; subsequently the answer selected for reinforcement changed. results showed the probability of producing a correct answer significantly decreased when reinforcement contingencies changed. data from both experiments suggest that approaching letter string problem solving from an operant, rather than cognitive perspective, could allow a better understanding and control of the phenomenon.
Pesquisa de los riesgos preconcepcional y prenatal
Varona de la Pea,Florinda; Hechavarría Rodríguez,Nerys; Orive Rodríguez,Nora M.;
Revista Cubana de Obstetricia y Ginecolog?-a , 2010,
Abstract: the assessment of reproductive risk at community level includes the diagnosis of conditions that are a potential risk for the healthy development of pregnancy and the baby. in the present paper the results of a screening of the pre-conception and prenatal risks in women of fertile age and pregnants, respectively, resident of the las tunas provinceare shown. the authors analyzed the registries and statistical reports from the provincial central of medical genetic corresponding to years 2007 and 2008 in order to include both the universe of women assessed and studied, estimating the coverage of both programs. the frequencies related to each risk condition, e.g. chromosomal diseases, hemoglobinopathies, birth defects, theratogenicity and other hereditary affections were al determined. 55.0 % of women assessed during the last year and 79.3 % in 2007 were classified with some pre-conception risk with a predominance of chromosomal diseases as the most frequent criterion of risk. the 40.7 % of the 5 746 pregnants seen in 2008 was considered in prenatal risks, a figure under the 49.2 % in the previous year. the risk of chromosomal disease was predominant in the prenatal assessment, present in the 62.1 % and the 71.3 % of pregnants in 2007 and 2008, respectively, at the expense of the pregnant during adolescence. it is necessary the presence of uniform criteria to assess the genetic risk in women who receive a specialized follow-up by genetics community services and inter-consultation with other specialties.
Pesquisa de los riesgos preconcepcional y prenatal Screening of the pre-conception and prenatal risks
Florinda Varona de la Pea,Nerys Hechavarría Rodríguez,Nora M. Orive Rodríguez
Revista Cubana de Obstetricia y Ginecolog?-a , 2010,
Abstract: La evaluación del riesgo reproductivo a nivel comunitario incluye el diagnóstico de las condiciones que significan un peligro potencial para el desarrollo saludable de la gestación y el ni o. En el presente trabajo se muestran los resultados de la pesquisa de los riesgos preconcepcional y prenatal en mujeres en edad fértil y gestantes, respectivamente, residentes en la provincia de Las Tunas. Se revisaron los registros y reportes estadísticos del Centro Provincial de Genética Médica correspondientes a los a os 2007 y 2008 para tomar el universo de mujeres a evaluar y las estudiadas, con lo que se calculó la cobertura de ambos programas. Se determinaron las frecuencias relacionadas con los riesgos por cada condición de riesgo: cromosomopatías, hemoglobinopatías, malformaciones congénitas, teratogenicidad y otras afecciones hereditarias. El 55,0 % de las mujeres evaluadas durante el último a o y el 79,3 % en el 2007 fue clasificada con algún riesgo preconcepcional, con un predominio de las cromosomopatías como criterio más frecuente de riesgo. El 40,7 % de las 5 746 gestantes atendidas en el 2008 fue considerada con riesgos prenatales, por debajo del 49,2 % en el a o precedente. El riesgo por cromosomopatía fue el predominante en la evaluación prenatal, presente en 62,1 % y 71,3 % de las gestantes en el 2007 y el 2008, respectivamente, a expensas del embarazo en la adolescencia. Se requiere de criterios uniformes para la evaluación del riesgo genético en las mujeres, a las que se les ofrece un seguimiento especializado por los servicios comunitarios de Genética e interconsultas con otras especialidades. The assessment of reproductive risk at community level includes the diagnosis of conditions that are a potential risk for the healthy development of pregnancy and the baby. In the present paper the results of a screening of the pre-conception and prenatal risks in women of fertile age and pregnants, respectively, resident of the Las Tunas provinceare shown. The authors analyzed the registries and statistical reports from the Provincial Central of Medical Genetic corresponding to years 2007 and 2008 in order to include both the universe of women assessed and studied, estimating the coverage of both programs. The frequencies related to each risk condition, e.g. chromosomal diseases, hemoglobinopathies, birth defects, theratogenicity and other hereditary affections were al determined. 55.0 % of women assessed during the last year and 79.3 % in 2007 were classified with some pre-conception risk with a predominance of chromosomal diseases as the most frequent c
Factores de cambio en los sistemas de información del sector bancario
Dionnys Pea,María Estela Aguilar,Nora Belloso,Jorge L. Parra
Revista Venezolana de Gerencia , 2003,
Abstract: El negocio bancario ha enfrentado grandes presiones provenientes de un entorno globalizado y tecnificado que le han obligado a transformar sus sistemas de información (SI). El objetivo de esta investigación es caracterizar los factores específicos que han impulsado los cambios en los SI del sector bancario además de precisar cuales han sido estos cambios. Para los fines del estudio, se ejecutó una investigación documental, que pasó por la revisión de fuentes de información como: páginas web, textos y revistas especializadas sobre dos variables fundamentales: sistema bancario y sistemas de información. Con ello se logró identificar y caracterizar a la globalización, la desintermediación y desregulación, la reorganización bancaria, la innovación financiera, la competitividad y el desarrollo tecnológico; como los más importantes factores que han propiciado cambios trascendentales en los SI de la banca a nivel internacional. Se concluye que la globalización ha sido el macro factor desencadenante de otros factores y cambios generales en las plataformas y alcances de los SI, mientras que el resto de los factores han propiciado la agregación de valor a los productos y servicios que se ofrecen, ventajas de interactividad e intercambio de información con el cliente, conexiones interbancarias cooperativas, actualizaciones constantes, entre otros cambios fundamentales en los sistemas de información.
Genotipos de rotavirus aislados de ni?os chilenos con gastroenteritis atendidos en dos hospitales públicos: variantes virales circulantes en un país con uso limitado de vacunas anti-rotavirus
Lucero,Yalda; Mamani,Nora; Cortés,Héctor; Pea,Alfredo; Vergara,Rodrigo; O'Ryan,Miguel;
Revista chilena de infectología , 2012, DOI: 10.4067/S0716-10182012000200004
Abstract: background: rotavirus is the main cause of severe gastroenteritis (ge) in children. two vaccines currently available have proven efficacy against the predominant genotypes. rotavirus genotypes vary both geographically and/or temporally. genotype surveillance is important to monitor trends associated or not with vaccine use. aim: to update information on rotavirus genotypes circulating in two main cities of chile. methodology: between may 2009-march 2010, children < 5y of age receiving medical care for ge in two large hospitals were recruited; none of these children had received rotavirus vaccine previously. epidemiological information was recorded in an ad-hoc form and stool samples were collected for rotavirus detection by a commercial elisa. genotyping was performed by semi-nested rt-pcr. results: a total of 296/967 samples (31%) were positive for rotavirus, with a peak in november/ december mostly in children 7-24 months old (67%). g9p[8] was the predominant genotype (76%), followed for g1p[8] (6%) and g2p[4] (6%) in both cities. conclusions: rotavirus caused one third of ge requiring emergency room care and/or hospitalization, mostly in children within an age range susceptible to benefit from rotavirus vaccines. g9p[8], a genotype against which rotavirus vaccines have demonstrated high efficacy, was by far the most frequent rotavirus variant. continued surveillance in chile is crucial for providing background information on disease burden and strain diversity before the introduction of rotavirus vaccines.
Genotipos de rotavirus aislados de ni os chilenos con gastroenteritis atendidos en dos hospitales públicos: variantes virales circulantes en un país con uso limitado de vacunas anti-rotavirus Rotavirus genotypes in children with gastroenteritis assisted in two public hospitals from Chile: viral strains circulating in a country without a universal vaccination against rotavirus
Yalda Lucero,Nora Mamani,Héctor Cortés,Alfredo Pea
Revista chilena de infectología , 2012,
Abstract: Antecedentes: Rotavirus es la principal causa de gastroenteritis (GE) grave en ni os. Actualmente se dispone de dos vacunas con eficacia demostrada contra los genotipos predominantes en el mundo. Los genotipos de rotavirus varían en el tiempo y de una región a otra. Es importante mantener la vigilancia de los genotipos circulantes para monitorizar las tendencias asociadas o no al uso de vacunas. Objetivo: Actualizar la información sobre genotipos de rotavirus circulantes en dos ciudades importantes de Chile (Santiago y Valparaíso). Metodología: Entre mayo 2009 y marzo 2010 se reclutaron ni os bajo 5 a os de edad con GE atendidos en dos hospitales; ninguno de ellos con historia previa de vacunación anti-rotavirus. Se registró información epidemiológica y se tomó muestra de deposición para detección de rotavirus mediante ELISA comercial. Se realizó genotipificación mediante RPC-TR semi-anidada. Resultados: Se detectó rotavirus en 296/967 muestras analizadas (31%), con un pico de frecuencia en noviembre/diciembre y afectando predominantemente al grupo de 7-24 meses de edad (67%). G9P[8] fue el genotipo predominante (76%), seguido por G1P[8] (6%) y G2P[4] (6%) en ambas ciudades. Conclusiones: Rotavirus causó un tercio de las GE en este grupo, afectando especialmente al grupo de edad que podría beneficiarse con la vacunación anti-rotavirus. G9P[8], una de las variantes contra las cuales las vacunas antirotavirus han demostrado alta eficacia, fue por lejos el genotipo más frecuente. Es necesario continuar la vigilancia en Chile de modo de conocer el impacto de la enfermedad y diversidad de variantes antes de la incorporación de una vacuna anti-rotavirus. Background: Rotavirus is the main cause of severe gastroenteritis (GE) in children. Two vaccines currently available have proven efficacy against the predominant genotypes. Rotavirus genotypes vary both geographically and/or temporally. Genotype surveillance is important to monitor trends associated or not with vaccine use. Aim: To update information on rotavirus genotypes circulating in two main cities of Chile. Methodology: Between May 2009-March 2010, children < 5y of age receiving medical care for GE in two large hospitals were recruited; none of these children had received rotavirus vaccine previously. Epidemiological information was recorded in an ad-hoc form and stool samples were collected for rotavirus detection by a commercial ELISA. Genotyping was performed by semi-nested RT-PCR. Results: A total of 296/967 samples (31%) were positive for rotavirus, with a peak in November/ December mostly in child
Análisis de restos de madera del Sitio Campo de Carrizal, Valle de Hualfín (Catamarca, Argentina)
Valencia,María C; Zagorodny,Nora I; Rivera,Stella M;
Darwiniana , 2009,
Abstract: the present investigation describes and identifies wood remains founded in a structure in campo de carrizal (belén, catamarca). these remains include a complete wooden shovel without carbonized marks or signs and two post fragments used to support the roof. the analyses were compared with results reported in previous studies regarding another post founded in a near enclosure of the same archaeological site. finding conditions of these remains have allowed us to infer fire events and pos-tdepositional processes.
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