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Search Results: 1 - 10 of 468943 matches for " J. C. RODRíGUEZ "
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Métodos de reducción del tiempo de proceso y mejora estructural de capas de SiGe obtenidas por cristalización en fase sólida
Rodríguez, A.,Rodríguez, T.,Sangrador, J.,Ballesteros, C.
Boletín de la Sociedad Espa?ola de Cerámica y Vidrio , 2004,
Abstract: Two methods, ion implantation and crystallization at two different temperatures, have been investigated to reduce the process time and to improve the structural properties of polycrystalline SiGe films obtained by solid phase crystallization for thin film transistors applications. The starting material was amorphous SiGe films deposited by low pressure chemical vapour deposition on oxidized silicon substrates. The crystallization kinetics and microstructure were analyzed in both cases using transmission electron microscopy and X-ray diffractometry. The first method consisted of the ion implantation with C or F and the subsequent crystallization at 600 oC. The implanted samples show greater grain sizes, smaller grain size dispersion and stronger (111) preferred orientation than the unimplanted ones. The second method consisted of the crystallization by sequential annealing at two different temperatures. The samples were processed by rapid thermal annealing at 625 oC for several minutes to form a certain density of crystalline nuclei. The subsequent crystallization at 525 oC takes place mainly from the previously induced nuclei. The process time is reduced by 50 %. The grain size in the samples processed in this way is at least equal than in the samples crystallized without the RTA treatment. This crystallization method does not affect the preferred orientation of the grains. Se han investigado dos métodos, implantación iónica y cristalización a dos temperaturas, para reducir el tiempo de proceso y mejorar la estructura de películas policristalinas de SiGe obtenidas por cristalización en fase sólida aplicables en transistores de película delgada. Se partió de capas amorfas de SiGe obtenidas mediante depósito químico en fase vapor a baja presión sobre Si oxidado térmicamente. En ambos casos se estudió la cinética de cristalización y la microestructura de las capas mediante microscopía electrónica de transmisión y difractometría de rayos X. El primer método consistió en la implantación iónica de las muestras con C o F y la posterior cristalización a 600 oC. Las muestras implantadas tienen tama o de grano mayor y más uniforme que las no implantadas y los granos presentan una orientación (111) más acentuada. El segundo método consistió en la cristalización mediante dos recocidos a temperaturas distintas. Las muestras fueron procesadas a 625 oC mediante procesado térmico rápido durante varios minutos para formar una cierta densidad de núcleos. Seguidamente se cristalizaron las capas a 525 oC partiendo de los núcleos creados. La duración del proceso se reduce h
El síndrome de Marshall o PFAPA debe ser sospechado en la consulta de Atención Primaria
Villanueva Rodríguez,C.; Caballero Soler,J.;
Pediatría Atención Primaria , 2009, DOI: 10.4321/S1139-76322009000500007
Abstract: introduction: pfapa syndrome (periodic fever, aphtas, pharyngitis and cervical adenopathies)is one of the causes included in recurrent or periodical fever entities in pediatrics. it is characterized by repeated episodes of high fever, pharyngitis, cervical adenopathies and aphtous stomatitis. its etiopathogeny is unknown. diagnosis is clinical-based and laboratory findings are inespecific. a single dose (1mg/kg) of oral prednisone resolves the episode and this spectacular outcome is used as diagnostic criterion. case report: we report the case of a patient of 5 years diagnosed of pfapa syndrome after some months of characteristic clinical outbreaks. discussion: periodic episodes of high fever, pharyngitis and cervical adenitis with poor response to conventional treatment should alert us about the pfapa syndrome. thinking about this entity will help to improve the diagnosis and therapeutic approach, further more reducing the parental anxiety.
Carga diferida en implantología
Vicente Rodríguez,J.C. de;
Revista Espa?ola de Cirugía Oral y Maxilofacial , 2005, DOI: 10.4321/S1130-05582005000500002
Abstract: implant dentistry has become a scientifically based practice with the discovery of the biological basis of osseointegration. in the classical protocol, implants were load-free while bone was healing around them to ensure predictable osseointegration. however, several disadvantages of this approach have lead recently to a new protocol based on loading implants immediately after their placement. but, several questions about the outcome of this approach remain unanswered. therefore, the aim of the present review article is to (i) review and analyze critically the biological basis of the load of implants, and (ii) propose guidelines for choosing the ideal moment to load dental implants, based on clinical variables. as a conclusion, delayed loading of implants remains the best protocol in several clinical situations.
Characterization of the materials of the ceiling that covers the Mayor Sacristhi of Seville's Cathedral
Barrios, J.,Barrios, A.,Rodríguez, C.
Materiales de Construccion , 2004,
Abstract: In this article we expose the technics used to characterize the materials of the ceiling that covers the Mayor sacristy of Seville's Cathedral and the causes of the loosening of mortar and stone fragments, we also expose some ways to overcome this fact. En este artículo se da cuenta de los estudios realizados y técnicas empleadas para determinar las características de los materiales (que se han seleccionado) de la cúpula de la Sacristía Mayor de la Santa Iglesia Catedral de Sevilla, así como de las causas que han producido el desprendimiento de fragmentos de mortero y piedras. Por último, se proponen una serie de medidas para solucionar este problema
Carga diferida en implantología Delayed loading in implantology
J.C. de Vicente Rodríguez
Revista Espa?ola de Cirugía Oral y Maxilofacial , 2005,
Abstract: La implantología dental se ha convertido en una práctica con bases científicas con el descubrimiento de la biología de la oseointegración. El protocolo terapéutico clásico implicaba mantener los implantes libres de carga hasta que estuviesen oseointegrados. Sin embargo, las desventajas de este procedimiento condujeron posteriormente al desarrollo de un nuevo protocolo, en el que los implantes son cargados de forma inmediata tras su colocación. Sin embargo, este nuevo abordaje suscita dudas acerca de su destino último que aún no han sido resueltas. El objetivo del presente artículo es (i) revisar y analizar críticamente las bases biológicas de la carga de los implantes y (ii) proponer guías orientativas para elegir el momento ideal de carga de los mismos, en función de variables clínicas. Como conclusión, se establece que si bien las cargas inmediata y diferida proporcionan los mismos resultados en diversas situaciones, la segunda es preferible en presencia de determinados factores de riesgo para el éxito de la primera. Implant dentistry has become a scientifically based practice with the discovery of the biological basis of osseointegration. In the classical protocol, implants were load-free while bone was healing around them to ensure predictable osseointegration. However, several disadvantages of this approach have lead recently to a new protocol based on loading implants immediately after their placement. But, several questions about the outcome of this approach remain unanswered. Therefore, the aim of the present review article is to (i) review and analyze critically the biological basis of the load of implants, and (ii) propose guidelines for choosing the ideal moment to load dental implants, based on clinical variables. As a conclusion, delayed loading of implants remains the best protocol in several clinical situations.
A longitudinal study of porcine proliferative enteropathy in a commercial pig farm in Yucatan Mexico
Rodríguez, J.C.;Alvarez, M.;Rodríguez, L.;Segura, J.C.;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2005, DOI: 10.1590/S0102-09352005000300020
Abstract: avaliou-se a distribui??o de lawsonia intracellularis em fezes de suínos, coletadas diretamente no reto, durante a fase de crescimento/termina??o, sob condi??es de campo, e determinou-se o efeito da infec??o l. intracellularis no ganho de peso. o estudo epidemiológico longitudinal foi desenvolvido em uma granja de múltiplos sítios em yucatan, méxico. a granja possuía três sítios geograficamente isolados com o sistema "todos dentro todos fora". uma amostra de 56 suínos negativos para a bactéria foi calculada utilizando prevalência esperada de 5%, nível de confian?a de 95% e popula??o de 2000 suínos terminados. os suínos foram amostrados 12 vezes desde o nascimento até a 23a semana de idade. a detec??o de dna bacteriano nas fezes pela técnica de rea??o em cadeia pela polimerase em qualquer coleta representou um caso. dos 56 suínos monitorados, 13 eliminaram l. intracellularis nas fezes e somente um resultou positivo duas vezes. a elimina??o de l. intracellularis foi detectada desde a terceira até a 19a semana de idade, observando-se maior número de animais positivos na 11a semana. a incidência acumulada e a taxa de incidência foram 23,2% e 1,21 suínos por 100 animais/semana em risco, respectivamente. as médias do ganho de peso por dia foram 0,742±0,06kg e 0,754±0,07kg para os suínos negativos e positivos, respectivamente (p>0,05). a elimina??o da bactéria ocorreu durante todo o período de estudo. pelo menos neste estudo, l. intracellularis n?o pode ser utilizado para predizer o efeito da bactéria sobre o ganho de peso.
Autonomía y estado de salud percibidos en ancianos institucionalizados
Rojas Oca?a,Ma. J.; Toronjo Gómez,A.; Rodríguez Ponce,C.; Rodríguez Rodríguez,J.B.;
Gerokomos , 2006, DOI: 10.4321/S1134-928X2006000100002
Abstract: the admission to a residence has been termed "institutionalization" in order to differentiate it from community care and to emphasize its nature as a specialisation. on admission to a centre, old people who are not invalid cease to perform certain tasks due to an adjustment process, which can result in passive behaviour; this in turn creates dependency. all old people, when enter a geriatric centre for the first time, undergo a period of adaptation and observation that lasts 20 days, after which they are evaluated by a technical committee. in a study previously made in the same population it was possible to be stated, referring us to the translated functional capacity in avd and aivd and to the perception of the health of the residents, during the first 20 days of entrance (period of adaptation) that the results show the existence of a significant relation between the autonomy and independence of an old person and a its deterioration due to the institutionalization, simultaneously it is deduced that the elder during this period of adaptation do not undergo significant changes in their perception of health by the fact of the institutionalization, although is certain that this period is only of 20 days according to the legislation of the social services in andalusia and that is not enough time to demonstrate the changes. believing necessary a pursuit but in the long term, we tried to make a second valuation of the aspects previously mentioned and measured after passing a sufficiently ample period (year and a half) like being able to state if the deterioration persists or not in the autonomy and independence of the elderly people to perform daily life and instrumental activities, as well as if their perception of health stays. objetive: to evaluate the influence of institutionalisation on an old person?s autonomy on admittance to a geriatric residence for non-invalids, and the comparison with their behaviour after the period of a year and a half of institutionalization
Autonomía y estado de salud percibidos en ancianos institucionalizados Autonomy and health status perceived by elderly institutionalised people
Ma. J. Rojas Oca?a,A. Toronjo Gómez,C. Rodríguez Ponce,J.B. Rodríguez Rodríguez
Gerokomos , 2006,
Abstract: El ingreso en residencias ha sido denominado con el concepto de institucionalización, para diferenciarlo de la atención comunitaria y denotar su carácter de especialización. Los ancianos válidos al ingreso en un centro dejan de realizar tareas por un mecanismo de ajuste de su conducta a la vez que pueden adoptar una actitud pasiva; efecto generador de dependencia. Todos los ancianos al ingresar por primera vez en un centro geriátrico se someterán a un período de adaptación y observación establecido en 20 días tras el cual será valorado por una comisión técnica. En un estudio anteriormente realizado en la misma población se pudo constatar, refiriéndonos a la capacidad funcional traducida en AVD e AIVD y a la percepción de la salud de los residentes, durante los primeros 20 días de ingreso (período de adaptación), que los resultados muestran la existencia de una relación significativa entre la autonomía e independencia de un anciano y su deterioro debido a la institucionalización, a la vez se deduce que los mayores durante dicho período de adaptación no sufren cambios significativos en su percepción de salud por el hecho de la institucionalización, si bien es cierto que dicho período es sólo de 20 días según la Legislación sobre Servicios Sociales en Andalucía y no hay tiempo suficiente para evidenciar los cambios. Al creer necesario un seguimiento más a largo plazo, se pretende hacer una segunda valoración de los aspectos anteriormente mencionados y medidos tras pasar un período lo suficientemente amplio (a o y medio) como para poder constatar si persiste o no el deterioro en la autonomía e independencia de los mayores para la realización de actividades de la vida diaria e instrumentales, así como si se mantiene su percepción de salud. Obejtivo: Evaluar la influencia que ejerce la institucionalización en la autonomía de un anciano en el momento de su ingreso en una residencia geriátrica de válidos y compararlo con el obtenido tras a o y medio de institucionalización. Método: Dise o preexperimental con estudio pretest-postest de un solo grupo en dos momentos diferentes, es decir, medición previa y posterior a una intervención, que en este caso sería el tiempo. Variables dependientes: Grado de Autonomía: Medir la capacidad del anciano/a referente a actividades cotidianas mediante el índice de Barthel, Actividades Básicas de la Vida Diaria (ABVD) y el de Lawton, Actividades Instrumentales de la Vida Diaria (AIVD). Variable Independiente: Ingreso del anciano/a en la Institución. Es la variable que pueda modificar o no su grado de autonomía. Variables sociodem
EVOLUTIVE AN REGRESSIVE SOIL SEQUENCES FOR ASSESSMENT OF SOIL DEGRADATION IN DESERTIFIED AREAS OF CANARY ISLANDS (SPAIN)
J.A. Guerra,C.D. Arbelo,A. Rodríguez Rodríguez,Rodríguez, J.L. Mora
Revista Sociedade & Natureza , 2005,
Abstract: The assessment of soil degradation in natural ecosystems must necessarily beperformed from a non-conventional perspective, focused on agricultural productivity. Thus,the assessment of soil degradation in natural ecosystems requires the definition of standardswith which to compare other soils and thus evaluate their quality. In order to define thesestandards and manage appropriately the processes involved in the degradation and variation ofsoil quality, it is necessary to understand and establish in detail the genetic processes that havetaken place in that area and have led to the formation of a mature soil, which would beconsidered to be standard, as a non-degraded soil. In accordance with these ideas, we presentin this work the evolutive and regressive succession of the soils and examples of theutilization of this methodology to evaluate soil degradation in arid zones and those in highdesertification risk in the Canary Islands.
Influencia del desgaste profesional en el gasto farmacéutico de los médicos de atención primaria
Cebrià,J.; Sobrequés,J.; Rodríguez,C.; Segura,J.;
Gaceta Sanitaria , 2003, DOI: 10.1590/S0213-91112003000600009
Abstract: objective: to determine the influence of various factors related to primary care physicians and their level of burnout on pharmaceutical expenditure per policy-holder (pep-h). method: we performed a cross-sectional study of 220 primary care physicians in the province of barcelona in 2000. a structured and validated questionnaire was administered through direct interview. the questionnaire was divided into two parts: general sociodemographic and professional data, and the maslach burnout inventory (mbi). at the same time, data on primary care physicians' pharmaceutical expenditure was collected from their corresponding health districts. results: the mean pharmaceutical expenditure was 264,627.22 euros (95% ci, 252,669.82-276,584.63) and the pep-h was 152,36 euros (95% ci, 145,73-158,99). the variables associated with greater pep-h were older age of the primary care physician, greater number of years of service in primary care, permanent work contract, primary care physicians who worked in several centers at the same time, primary care physicians who did not work in accredited teaching centers, urban centers, and high levels of emotional exhaustion in the mbi. conclusions: primary care physicians are subject to various degrees of stress in their daily work. accumulation of these psychological stressors provokes emotional exhaustion, which complicates decision making when writing prescriptions and tends to lead to a vicious circle. thus, primary care physicians with a high level of burnout could, on a variety of occasions, compensate for this lack of psychological resources by less efficient management of pharmaceutical expenditure when prescribing.
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