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Subsistencia y movilidad de los cazadores-recolectores que ocuparon Cueva Traful I durante el Holoceno Medio y Tardío.
José Agustín Cordero
Comechingonia Virtual : Revista Electrónica de Arqueología , 2011,
Abstract: We present the results of the analysis from middle and late Holocene bone ensemble of Traful I cave (province of Neuquén, Argentina). Also, we discuss the subsistence and mobility of the hunter-gatherers and the seasonality of their occupations. The huntersgatherers societies that recurrently inhabited this site, exploited the guanaco as part of their subsistence practices. This way of live is widespread in the middle Holocene, in the ecotono and in the steppe, but always complemented with small game, mollusks, fish or vegetables. In the last 2.000 years the number of exploited species significantly increased with diversity. This phenomenon is due to the reduction of the home ranges mostly drive by territorial circumscription of the groups that began to differ interethnically. The incorporation of the ceramic technology allowed: delay the consumption of some resources, extract the fat of the bones more efficiently and vegetables processing. These materials conditions of existence are interrupted by the Spanish conquest. Following this, the adoption of the horse radically changed the way of life of those pedestrian huntergatherers.
El Centro Histórico de Guanajuato, el iPod y los jóvenes
Cordero Domínguez, José de Jesús;
Alteridades , 2010,
Abstract: this paper studies the relationship between the social practices of university students and their use of the ipod in the historical center in the city guanajuato; which seems to synthesize the "spirit of the time" -individualism and isolation as an expression of their identity.
Influencia del Tratamiento de Datos en la Detección de Regímenes Caóticos en series Temporales
Rafti,Matías; Cordero,Cristina; Vicente,José L;
Información tecnológica , 2010, DOI: 10.4067/S0718-07642010000400003
Abstract: the influence of the filtering scheme on time series for their use in the characterization and detection of non lineal regimes. as an example, the grassberger-procaccia algorithm for phase-space trajectory correlation dimension is used the main interest of such analysis is to study the similarities with the processing of experimental images from reaction-diffusion systems obtained via surface science standard tools such as photoelectron emission microscopy. simulation results show how inadequate filtering parameter choice may lead to erroneous characterization of systems as non-linear or chaotic.
Influencia del Tratamiento de Datos en la Detección de Regímenes Caóticos en series Temporales Influence of Data Handling on the Detection of Chaotic Regimes in time series Analysis
Matías Rafti,Cristina Cordero,José L Vicente
Información Tecnológica , 2010,
Abstract: Se estudia la influencia del procedimiento de filtrado aplicado sobre series temporales para su uso en la caracterización y detección de regímenes no-lineales. Para esto, se toma como ejemplo de dichos métodos, un algoritmo ampliamente utilizado para el cálculo de la dimensión de correlación de la trayectoria en el espacio de las fases (el algoritmo de Grassberger-Procaccia). El interés de este ejemplo de estudio radica en la similitud con el procedimiento que se aplica al analizar imágenes experimentales de sistemas fisicoquímicos de reacción-difusión, provenientes de técnicas de análisis superficial como la microscopía de emisión de fotoelectrones. Los resultados de las simulaciones realizadas muestran como el uso de un parámetro de filtrado inadecuado puede conducir a caracterizar erróneamente estados como no lineales o caóticos. The influence of the filtering scheme on time series for their use in the characterization and detection of non lineal regimes. As an example, the Grassberger-Procaccia algorithm for phase-space trajectory correlation dimension is used The main interest of such analysis is to study the similarities with the processing of experimental images from reaction-diffusion systems obtained via surface science standard tools such as photoelectron emission microscopy. Simulation results show how inadequate filtering parameter choice may lead to erroneous characterization of systems as non-linear or chaotic.
Repercusiones médico legales de los desastres nucleares
Oscar Bola?os Aymerich,José Miguel Cordero Cordero,José Daniel Ducca Arauz,Sofía Navarro Calvo
Medicina Legal de Costa Rica , 2013,
Abstract: Se han descrito múltiples efectos nocivos de las radiaciones ionizantes en el cuerpo humano. Cuando la exposición a fuentes radioactivas se produce en el contexto de un accidente se debe en primer lugar, brindar la atención médica necesaria y posteriormente sentar las responsabilidades del caso, para lo cual el médico forense debe estar capacitado en valorar los da os producidos. There is a lot of harmful effects of ionizing radiation on the human body. When exposure to radioactive sources occurs in the context of an accident must first provide the necessary medical care and then lay the responsibilities required, for which the coroner should be trained to assess damage.
Timectomía por miastenia gravis en el Hospital Dr. Rafael Angel Calderón Guardia: Reporte de 24 casos
Mainieri Hidalgo,José A; Lépiz Cordero,lvannia;
Acta Médica Costarricense , 2000,
Abstract: background: miastenia gravis is an autoimmune disease, its etiology has not been defined clearly. the improvement of the clinical manifestations after thymectomy was first describes in 1912; and this procedure has become in one of the therapeutic alternativas for the disease nowadays. the aim of the present study was to investigase the results of thymectomy for miastenia gravis in the hospital dr. r. a. calderón guardia. materials and methods: retrospective study, based in the revision of the clinical files of 24 consecutive patients in whom a thymectomy was performed as part of their treatment for miastenia gravis between january 1992 and may 1999 in the hospital dr. r. a. calderon guardia. results: 75% of the patients improved their condition after the surgery, 17% had no variation and 8% deteriorated their clinical condition after the thymectomy. there was no difference in the clinical outcome relates to sex, age or presence of thymoma. however, patients that only had ocular manifestations previous to the surgery had a tendency to remain symptomatic after surgery. the pre-surgical preparation of the palien with intravenous gamma globulin and the improvements in the anesthetic technique lowered the need for mechanical ventilation. conclusion: thymectomy improved 75% of the patients with miastenia gravis, specially those who had other manifestations apart from ocular involvement. the procedure allowed the reduction of treatment in 12 of the 24 cases studied.
Molluscan assemblage from a tropical intertidal estuarine sand-mud flat, Gulf of Nicoya, Pacific, Costa Rica (1984-1987)
Vargas-Zamora,José A; Sibaja-Cordero,Jeffrey A;
Revista de Biología Tropical , 2011,
Abstract: the availability of data sets covering more than a year is scarce for tropical environments. advances in hardware and software speed-up the re-analysis of old data sets and facilitates the identification of hidden data patterns. from february 1984 to april 1987 (49 sampling dates), core samples (17.7cm2, 15cm deep) were collected at low tide at a sand-mud flat in the mid upper gulf of nicoya estuary, pacific, costa rica. predator exclusion experiments (cages 0.5x0.5x0.2m, galvanized wire, mesh size 5mm), were conducted at the site in 1985 (dry and rainy seasons sets). samples were preserved with 5% buffered formalin in sea water stained with rose bengal, and washed after 24 hours on a 500 micron mesh sieve. the 1 120 cores yielded a total of 112 morphological species of which the mollusks were represented by 23 species, and included the bivalves tellina rubescens, tagelus bourgeoisae, dosinia dunkeri and leukoma asperrima, and the gastropods, natica unifasciata, nassarius luteostomus, costoanachis rugosa and turbonilla sp. the 23 species are indicative of a relatively rich sedimentary molluscan fauna. t. bourgeoisae had a seasonal oscillation, with higher abundancesduring the rainy seasons. t. rubescens was not seasonal, but presented an oscillation with peaks at about 1.5 year intervals. many empty shells of cosmioconcha modesta, lower number of n. luteostomus and a few of t. rubescens were found with boreholes by the predatory snail n. unifasciata. t. rubescens was not significantly more abundant inside or outside cages. t. bourgeoisae showed a significant increase within the caged areas. the numerical fluctuations of the mollusks became more important during the rainy season of 1985. red tide outbreaks in the gulf of nicoya in 1985 may have had an impact on the molluscan populations. rev. biol. trop. 59 (3): 1135-1148. epub 2011 september 01.
Utilidad y limitaciones de la medición del CO2 espirado (capnometría) en pacientes pediátricos en ventilación mecánica Comparison of arterial and end tidal PCO2 in pediatric patients in mechanical ventilation
José Baeza R,Paulina Rojas N,Jaime Cordero T
Revista chilena de pediatría , 1993,
Abstract:
Complicaciones de ventilación mecánica en ni os Complications of mechanical ventilation in children
Silvia Arriagada T,Jaime Cordero T,José Baeza R
Revista chilena de pediatría , 1994,
Abstract:
Timectomía por miastenia gravis en el Hospital Dr. Rafael Angel Calderón Guardia: Reporte de 24 casos
José A Mainieri Hidalgo,lvannia Lépiz Cordero
Acta Médica Costarricense , 2000,
Abstract: Antecedentes: La miastenia gravis es una enfermedad autoinmune cuya etiología aún no está claramente definida. Desde 1912 se describió mejoría del cuadro posterior a timectomía. Este procedimiento es actualmente una de las formas aceptadas para su tratamiento. El objetivo del presente trabajo fue estudiar los resultados de la timectomía para el tratamiento de la miastenia gravis en el Hospital Rafael Angel Calderón Guardia. Materiales y Métodos: Estudio retrospectivo, basado en la revisión de los expedientes de 24 pacientes, a quienes se les realizó timectomía como parte de su tratamiento de miastenia gravis entre enero de 1992 y mayo de 1999, en el Hospital Dr. Rafael Angel Calderón Guardia. Resultados: Se encontró que un 75% de los pacientes presentaron una franca mejoría, 17% permaneció en igual condición y un 8% empeoró. No se observó diferencia en la evolución por sexo, edad o la presencia de timoma, sin embargo en los pacientes que presentaban únicamente síntomas oculares se dio una tendencia a persistir sintomáticos. Se observó que la preparación pre-operatoria del paciente con gamaglobulina y la modernización de la técnica anestésica disminuyó notablemente la necesidad de ventilación mecánica. Conclusión: La timectomía fue útil en el tratamiento del 75% de los pacientes, especialmente aquellos con no sólo ptosis palpebral y permitió disminuir la dosis de medicamentos en 12 de los 24 casos estudiados. Background: Miastenia gravis is an autoimmune disease, its etiology has not been defined clearly. The improvement of the clinical manifestations after thymectomy was first describes in 1912; and this procedure has become in one of the therapeutic alternativas for the disease nowadays. The aim of the present study was to investigase the results of thymectomy for miastenia gravis in the Hospital Dr. R. A. Calderón Guardia. Materials and Methods: Retrospective study, based in the revision of the clinical files of 24 consecutive patients in whom a thymectomy was performed as part of their treatment for miastenia gravis between January 1992 and May 1999 in the Hospital Dr. R. A. Calderon Guardia. Results: 75% of the patients improved their condition after the surgery, 17% had no variation and 8% deteriorated their clinical condition after the thymectomy. There was no difference in the clinical outcome relates to sex, age or presence of thymoma. However, patients that only had ocular manifestations previous to the surgery had a tendency to remain symptomatic after surgery. The pre-surgical preparation of the palien with intravenous gamma globulin and the
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