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Search Results: 1 - 10 of 249412 matches for " Francisco Jorge Santana-Martín "
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Electro‐Quasistatic Analysis of an Electrostatic Induction Micromotor Using the Cell Method
José Miguel Monzón-Verona,Francisco Jorge Santana-Martín,Santiago García–Alonso,Juan Antonio Montiel-Nelson
Sensors , 2010, DOI: 10.3390/s101009102
Abstract: An electro-quasistatic analysis of an induction micromotor has been realized by using the Cell Method. We employed the direct Finite Formulation (FF) of the electromagnetic laws, hence, avoiding a further discretization. The Cell Method (CM) is used for solving the field equations at the entire domain (2D space) of the micromotor. We have reformulated the field laws in a direct FF and analyzed physical quantities to make explicit the relationship between magnitudes and laws. We applied a primal-dual barycentric discretization of the 2D space. The electric potential has been calculated on each node of the primal mesh using CM. For verification purpose, an analytical electric potential equation is introduced as reference. In frequency domain, results demonstrate the error in calculating potential quantity is neglected (
Los pactos parasociales en la Bolsa Espa ola
Domingo Javier Santana-Martín
Universia Business Review , 2010,
Abstract: A pesar del esfuerzo realizado por parte de las instituciones e investigadores espa oles por conocer el nivel de utilización de los distintos mecanismos de gobierno de las empresas cotizadas, aun existen instrumentos poco conocidos de este sistema. En este sentido, este trabajo analiza la presencia de pactos parasociales en el mercado bursátil espa ol en el periodo 2003-2009. Los resultados muestran la celebración de estos contratos en aproximadamente una de cada cuatro sociedades cotizadas, vinculándose en dichos acuerdos en torno al 42% de los derechos de voto. Además, los resultados obtenidos revelan una mayor presencia de pactos parasociales en las empresas de mayor capitalización, en las de mayor concentración de propiedad, en las que no adoptan medidas estatutarias de blindaje y en las controladas a través de estructuras piramidales.
Blindaje y capacidad informativa del resultado contable
Carolina Bona-Sánchez,Jerónimo Pérez-Alemán,Domingo J. Santana-Martín
Universia Business Review , 2008,
Abstract: El objetivo del trabajo es analizar la incidencia de las medidas defensivas (MDs) en la calidad de la información contable divulgada, en un contexto en el que el principal conflicto de agencia deriva de la divergencia de intereses entre accionistas controladores y propietarios minoritarios. Utilizando un índice de blindaje dise ado a partir de las disposiciones estatutarias defensivas de las empresas cotizadas espa olas, los resultados obtenidos evidencian una incidencia negativa de las MDs en la calidad de la información contable
Biodistribución y farmacocinética de Taninos de Pinus caribaea Morelet y Casuarina equisetifolia en ratones
Jorge Luis Santana Romero,Carlos Fabián Calderón Marín,Francisco Martínez Luzardo,Rita María Pérez
Revista Cubana de Farmacia , 2002,
Abstract: Se estudió la biodistribución y la farmacocinética de taninos condensados purificados y marcados radioisotópicamente, extraídos a partir de la corteza de las especies forestales Pinus caribaea Morelet var caribaea y Casuarina equisetifolia previa administración por vía oral y endovenosa, con el empleo de ratones como biomodelo. Los taninos estudiados, con una alta capacidad antioxidante y diferenciados por la propiedad de formar complejos con proteínas, presentaron una rápida biodistribución hacia los diferentes órganos y tejidos, con manifestaciones de un importante acúmulo en el estómago e intestinos. Los taninos de ambas especies describen una biodistribución que se ajusta a un modelo bicompartimental de distribución. Se reportan los parámetros farmacocinéticos como tiempo de residencia medio, aclaramiento total, área bajo la curva, biodisponibilidad e instante de tiempo en que ocurre la máxima incorporación a partir de las curvas del aclaramiento sanguíneo. Biodistribution and pharmacokinetics of radioisotope-labeled and purified condensed tannins from Pinus caribaea Morelet var caribaea and Casuarina equisetifolia barks were studied after they were orally and intravenously administered to mice which served as biomodels. The studied tannins, known as strong antioxidants and protein complex ligands, showed a rapid biodistribution into several organs and tissues. Accumulation of these substances in the stomach and intestines was significant. Tannins from both species described a biodistribution that adapted to a biocompartimental model of distribution. Pharmacokinetic parameters such as mean residence time, total clearance, area under the curve, bioavailability and the moment when the maximum incorporation occurs were estimated from the blood clearance curves.
Biodistribución y farmacocinética de Taninos de Pinus caribaea Morelet y Casuarina equisetifolia en ratones
Santana Romero,Jorge Luis; Calderón Marín,Carlos Fabián; Martínez Luzardo,Francisco; Pérez,Rita María; Montalvo Duquesne,Marta; ávila Cabrera,Ana María; Codorniú Hernández,Edelsys;
Revista Cubana de Farmacia , 2002,
Abstract: biodistribution and pharmacokinetics of radioisotope-labeled and purified condensed tannins from pinus caribaea morelet var caribaea and casuarina equisetifolia barks were studied after they were orally and intravenously administered to mice which served as biomodels. the studied tannins, known as strong antioxidants and protein complex ligands, showed a rapid biodistribution into several organs and tissues. accumulation of these substances in the stomach and intestines was significant. tannins from both species described a biodistribution that adapted to a biocompartimental model of distribution. pharmacokinetic parameters such as mean residence time, total clearance, area under the curve, bioavailability and the moment when the maximum incorporation occurs were estimated from the blood clearance curves.
Prevalencia de factores de riesgo asociados a trastornos del comportamiento alimentario en adolescentes de una institución educativa en Cali, Colombia 2005
Rodríguez,Jorge Martín; Mina,Francisco Javier;
Revista Colombiana de Obstetricia y Ginecología , 2008,
Abstract: introduction: eating disorders (ed) are topics of current interest for clinical, epidemiological and basic research. this study was aimed at determining the prevalence and perceptions of risk associated with ed in female adolescents from an educational institution in the city of cali. materials and methods: an observational, crosssectional study was carried out with a sample of teenagers from an educational institution in cali, colombia. a questionnaire was designed and validated for collecting data. univariate and bivariate analyses were performed using 95% confidence intervals and a p <0.05 significance level. individual, family and social behavior was reported. results: students? average age was 13; 7.1% of them (3.5%-10.7% 95%ci) cited vomiting as a way of losing weight. their relatives identified 86.9% (82.2%-86.9% 95% ci) of them using laxatives to lose weight while friends and peers reported 15.7% (10.6%-20.8% 95%ci) inducing vomiting and seeing 12.6% (8.0%-17.2% 95%ci) of them using diet pills. there was 3.5% prevalence of risk of ed, this being statistically significant in those aged more than 15 and in girls from the ninth grade and above (p <0.05). discussion: although the prevalence of risk found in this research was low in relation to others, it can be partly attributed to methodological reasons or these adolescents? average age, as they were younger than in other studies.
Prevalencia de factores de riesgo asociados a trastornos del comportamiento alimentario en adolescentes de una institución educativa en Cali, Colombia 2005 The prevalence of risk factors associated with eating disorder patterns in adolescents from an educational institution in Cali, Colombia, 2005
Jorge Martín Rodríguez,Francisco Javier Mina
Revista Colombiana de Obstetricia y Ginecología , 2008,
Abstract: Introducción: los trastornos de la conducta alimentaria (TCA) son un tema de interés actual para la investigación clínica, epidemiológica y básica. El objetivo de este estudio es determinar la prevalencia y las percepciones de riesgo asociadas a TCA en mujeres adolescentes de una institución educativa en la ciudad de Cali. Materiales y métodos: se realizó un estudio observacional tipo transversal con una muestra de adolescentes procedentes de una institución educativa en Cali, Colombia. Se dise ó y validó un cuestionario estructurado para la recolección de la información; se realizó análisis univariado y bivariado empleando intervalos de confianza (IC) al 95% y un nivel de significancia p <0.05; se diferenciaron conductas a nivel individual, familiar y social. Resultados: la edad promedio de las estudiantes fue 13 a os, el 7,1% (IC: 95% 3,5% - 10,7%) refirieron vomitar como medida para reducir peso. En las conductas identificadas en sus familiares, el 86,9% (IC: 95% 82,2% - 86,9%) reportó uso de laxantes para adelgazar, mientras en amigos y pares el 15,7% (IC: 95% 10,6% - 20,8%) y el 12,6% (IC: 95%8,0% -17,2%) percibieron inducción al vómito y empleo de pastillas para adelgazar, respectivamente. La prevalencia de riesgo para los TCA fue 3,5%, siendo estadísticamente significativa en las mayores de 15 a os y en adolescentes de grados superiores a noveno (p <0,05). Discusión: aunque la prevalencia del riesgo encontrada en esta investigación fue baja respecto a otras, se puede atribuir en parte a razones metodológicas, o porque la edad promedio de estas adolescentes era menor a otros estudios. Introduction: eating disorders (ED) are topics of current interest for clinical, epidemiological and basic research. This study was aimed at determining the prevalence and perceptions of risk associated with ED in female adolescents from an educational Institution in the city of Cali. Materials and methods: an observational, crosssectional study was carried out with a sample of teenagers from an educational institution in Cali, Colombia. A questionnaire was designed and validated for collecting data. Univariate and bivariate analyses were performed using 95% confidence intervals and a P <0.05 significance level. Individual, family and social behavior was reported. Results: students’ average age was 13; 7.1% of them (3.5%-10.7% 95%CI) cited vomiting as a way of losing weight. Their relatives identified 86.9% (82.2%-86.9% 95% CI) of them using laxatives to lose weight while friends and peers reported 15.7% (10.6%-20.8% 95%CI) inducing vomiting and seeing 12.6% (8.0%-17
"INTERNATIONAL TECHNOLOGY SPILLOVERS FROM TRADE: THE IMPORTANCE OF THE TECHNOLOGICAL GAP"
Jorge Crespo,Carmela Martín,Francisco J. Velázquez
Investigaciones Económicas , 2004,
Abstract: This paper analyses two significant and to date open issues regarding the role of trade as a channel for international technology spillovers. The first refers to its relative impact on growth in comparison to that of own R&D spending. The second has to do with the importance of the technological gap to take advantage of foreign technology. For this purpose we estimate a version of the growth model proposed by Benhabib and Spiegel (1994), which includes some modifications to better capture the technology di usion process. Our results first suggest that domestic R&D and human capital stocks are critical for foreign technology adoption. Secondly, they indicate that richer countries are more successful in taking advantage of international technology spillovers.
Inhibición de la replicación del virus de inmunodeficiencia humana por extractos de taninos de Pinus caribaea Morelet
Ruibal Brunet,Ignacio Juan; Dubed Echevarría,Marta; Martínez Luzardo,Francisco; Noa Romero,Enrique; Vargas Guerra,Luis M; Santana Romero,Jorge L;
Revista Cubana de Farmacia , 2003,
Abstract: six different fractions from the bark of pinus caribae moralet var. caribae were faced in five different concentrations against two viral doses (moi 0,1 y 0,01) in a vitro assay on mt4 cell lines; the antiviral activity was measured by p24 ag capture elisa assay (davih agp24). all the fractions showed a mild cytotoxicity activity and only one fraction showed the highest cytotoxicity activity. the fraction 02 had the highest percentage of viral replication inhibition, correlated with the viral dose and the product concentration, having a selectivity rate of 100; however, more research about the chemical structure of active compounds, and possible mechanisms of action are needed.
Hepatectomía extendida: Una alternativa segura en lesiones hepatobiliares malignas Extended hepatectomy: A safe procedure for hepatobiliary malignancy
JUAN FRANCISCO GUERRA C,NICOLáS JARUFE C,JORGE MARTíNEZ C,SERGIO GUZMáN B
Revista Chilena de Cirugía , 2007,
Abstract: Introducción: La hepatectomía extendida, definida como la resección de 5 o más segmentos hepáticos, se ha asociado a un elevado riesgo perioperatorio. El objetivo del presente estudio es comparar los resultados quirúrgicos de pacientes sometidos a resecciones hepáticas de más de 2 segmentos versus hepatectomía extendida. Material y Método: Se analizó nuestra serie prospectiva de pacientes entre agosto 2002 y junio 2005. Se excluyeron resecciones laparoscópicas, unisegmentarias y no anatómicas. Se configuraron 2 grupos: Grupo I: Hepatectomías extendidas, Grupo II: Resecciones hepáticas de 2 a 4 segmentos. Se analizaron variables demográficas, indicaciones, uso de hemoderivados, función hepática postoperatoria, morbilidad y mortalidad. Resultados: En este período se realizaron 59 hepatectomías. Veitinueve cumplieron los criterios de inclusión. Grupo I: (n=14,) Grupo II: (n=15). Todos los pacientes del primer grupo fueron resecados por lesiones malignas (9 metástasis, 5 tumores primarios). El promedio de segmentos resecados fue 5.5 para el grupo I y 2.3 para el Grupo II. Los tiempos operatorios promedio fueron 283 y 199 minutos, respectivamente (p=0.025). Se transfundieron un promedio de 2.69 y 0.85 U GR en cada grupo (p=0.009). La estadía hospitalaria promedio fue 13.6 días para el primer grupo, y 7.35 para el segundo (p=0.004). En el Grupo I, 4 de 14 pacientes presentaron complicaciones quirúrgicas y 1 de 15 en el grupo II (p=0.1). Fallece un paciente de cada grupo, debido a insuficiencia hepática postoperatoria. Conclusiones: A pesar del gran volumen de parénquima resecado, la hepatectomía extendida es una alternativa segura para el tratamiento de lesiones hepáticas malignas Introduction: Extended hepatectomy has been associated with a high perioperative risk. The aim of this study is to compare the surgical results in patients who underwent a hepatic resection of more than two Couinaud's segments versus an extended hepatectomy (more than four segments). Methods: Our prospective database from August 2002 to June 2005 was reviewed. Non-anatomical, unisegmental and laparoscopic resections were excluded. There were two groups. Group I: Extended hepatectomies; Group II: Hepatic resections from 2 to 4 segments. Demographic characteristics, indications for surgery, technical aspects, use of hemocomponents, post-operative liver function, morbidity and mortality were reviewed. Results: In this period, 59 hepatectomies were performed. 29 procedures achieved the inclusion criteria. Group I: (n=14), Group II: (n=15). Hepatobiliary malignancy was the surgical indic
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