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Search Results: 1 - 10 of 42624 matches for " González del Castillo "
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La ciudad lineal en Chile/ A linear city in Chile.
González del Castillo, Hilarión (1912).
Revista de Urbanismo , 2009, DOI: doi: 10.5354/0717-5051.2009.5
Abstract: Se refiere los avances del arquitecto chileno Carlos Carvajal para efectos de construir una ciudad lineal en Chile. El congreso Nacional de Chile, aprobó este proyecto declarándolo “de utilidad pública”./The author relates the progress of the Chilean architect, Carlos Carvajal, for purposes of constructing a linear city in Chile. The National Congress of Chile approved the project Carvajal, stating the proposed work, a work of “public utility”.
Complete solutions of the Hamilton-Jacobi equation and the envelope method
G. F. Torres del Castillo,G. S. Anaya González
Physics , 2014,
Abstract: It is shown that the parameters contained in any two complete solutions of the Hamilton-Jacobi equation, corresponding to a given Hamiltonian, are related by means of a time-independent canonical transformation and that, in some cases, a generating function of this transformation is given by the envelope of a family of surfaces defined by the difference of the two complete solutions. Conversely, in those cases, one of the complete solutions is given by the envelope of a family of surfaces defined by the sum of the other complete solution and the generating function of the canonical transformation. Some applications of these results to geometrical optics are also given.
Prevalencia de secuelas de traumatismos en dientes temporales en ni?os institucionalizados del municipio Playa
Casals González,Yanet; Montero del Castillo,Mirta Elena; González Naya,Grisel;
Revista Cubana de Estomatolog?-a , 2011,
Abstract: to determine the prevalence of sequelae of traumata of temporary teeth in group of institutionalized children and to identify the causes and places of more frequent occurrence a cross-sectional and descriptive study was conducted in children from the nursing home of the playa municipality. sample selection was performed by multistage stratified sampling. in each stratus the 25 % of nursing homes was choose for a total of 10. these were selected by randomized simple sampling. the sample was determined taking into account that the traumatic lesions appearance frequency according to the studies conducted fluctuate about the 30 %. children aged 2 to 5 were included institutionalized over 10 years in nursing homes presenting with sequelae of teeth traumatic lesions without stomatology treatment; 1 250 children were examined. the sequelae prevalence was of the 18.56 % where the more frequent ones were the loss of coronary tissue in 9.44 % of study children, followed by the color changes with a 5.92 %. the more prevalent sex was the male one with an 11.2 % of total. the more involved ages were those of 3 and 5 years for a 4.96 % and a 5.68 %, respectively. most of lesions occurred due to falls in a 9.84 % where the 7.76 % were at home. a high percentage of teeth with trauma sequelae and a need of treatment no registered in conventional examinations performed at schools.
Prevalencia de secuelas de traumatismos en dientes temporales en ni os institucionalizados del municipio Playa Prevalence of sequelae of temporal teeth traumata in institutionalized children from the Playa municipality
Yanet Casals González,Mirta Elena Montero del Castillo,Grisel González Naya
Revista Cubana de Estomatolog?-a , 2011,
Abstract: Con el objetivo de determinar la prevalencia de las secuelas de los traumatismos en dientes temporales en un grupo de ni os institucionalizados e identificar las causas y lugares de ocurrencia más frecuentes, se realizó un estudio descriptivo y transversal en círculos infantiles del municipio Playa. La selección de la muestra se realizó mediante el muestreo estratificado polietápico. En cada estrato se seleccionó el 25 % de los círculos infantiles para un total de 10. Estos se escogieron mediante un muestreo simple aleatorio. La muestra se determinó y se tuvo en cuenta según la frecuencia de aparición de las lesiones traumáticas en estudios realizados que oscilan alrededor del 30 %. Se incluyeron los ni os de 2 a 5 a os de 10 círculos infantiles que presentaron secuelas de lesiones traumáticas de los dientes y que no habían recibido tratamiento estomatológico; se examinaron 1 250 ni os. La prevalencia de las secuelas resultó ser de 18,56 %, las más frecuentes fueron la pérdida de tejido coronario en el 9,44 % de los ni os examinados, seguidas de los cambios de color con un 5,92 %. El sexo de mayor prevalencia fue el masculino con un 11,2 % del total. Las edades más afectadas fueron las de 3 y 5 a os, que representaron un 4,96 % y un 5,68 % respectivamente. La mayor parte de la lesiones ocurrieron por caídas en un 9,84 %, el 7,76 % en el hogar. Un alto por ciento de dientes con secuelas de trauma y necesidad de tratamiento que no se encuentran registrados en los exámenes convencionales que se realizan en las escuelas. To determine the prevalence of sequelae of traumata of temporary teeth in group of institutionalized children and to identify the causes and places of more frequent occurrence a cross-sectional and descriptive study was conducted in children from the nursing home of the Playa municipality. Sample selection was performed by Multistage Stratified Sampling. In each stratus the 25 % of nursing homes was choose for a total of 10. These were selected by randomized simple sampling. The sample was determined taking into account that the traumatic lesions appearance frequency according to the studies conducted fluctuate about the 30 %. Children aged 2 to 5 were included institutionalized over 10 years in nursing homes presenting with sequelae of teeth traumatic lesions without Stomatology treatment; 1 250 children were examined. The sequelae prevalence was of the 18.56 % where the more frequent ones were the loss of coronary tissue in 9.44 % of study children, followed by the color changes with a 5.92 %. The more prevalent sex was the male one with
Identificación fitoquímica de las hojas y ramas de la Helietta cubensis Monach-Moldenke, especie endémica de Cuba
Sandra del Castillo Ochoa,José Antonio González-Lavaut,Johannes González Guevara,Sylvia Prieto-González
Revista Cubana de Farmacia , 2004,
Abstract: Se describe el tamizaje fitoquímico preliminar de las hojas y ramas de la Helietta cubensis Monach -Moldenke, especie endémica cubana que crece en la cima de los mogotes de Pinar del Río. La detección de los metabolitos secundarios se realizó mediante reactivos de identificación específicos para cada familia de compuestos. En ambas partes de la especie se identificaron en alta abundancia flavonoides y lactonas/coumarinas; en baja concentración se detectaron triterpenos/esteroides, lípidos/aceites esenciales, saponinas y carotenos y no la presencia de aminas y alcaloides. Mediante el análisis por cromatografía de capa fina se pudo corroborar los resultados obtenidos en la identificación de alcaloides, flavonoides y coumarinas. En general, los resultados obtenidos fueron homogéneos para ambas partes de la planta, y constituyen el primer reporte de la composición química para esta especie. The preliminary phytochemical screening of the leaves and branches of Helietta cubensis Monach-Moldenke, a Cuban endemic species that grows in the hummocks of Pinar del Río is described. The detection of the secondary metabolites was carried out by reagents of identification that are specific for each family of compounds. A great number of flavonoids and lactones/coumarines was identified in both parts of the species. A low concentration of triterpenes/steroids, lipids/essential oils, saponins and carotenes was observed, whereas amines and alkaloids were not detected. The results obtained in the identification of alkaloids, flavonoids and coumarines were corroborated by thin layer chromatography. In general, the results attained were homogeneous for both parts of the plant and they are the first report about the chemical composition of this species.
Evaluación de la función mantenimiento en empresas transportistas
Ra?a González,Luz del Alba; Castillo Asencio,Orlando; Baste González,Jorge; Falcón Cuadra,José Luís;
Revista Ciencias T??cnicas Agropecuarias , 2010,
Abstract: the production process on transportation depends of many elements because depends of many factors. between them, the correct selection of means of transportation that are going to be used in several conditions of explotation. they will require an appropriates management from the function. now always, the cuban traveller sectors involved in a renovation process of its fleet, requires a right evaluation of the maintenance function. this works has the objective of establishing a method to evaluate the maintenance function in those companies dedicated to manage the transportation fleets. there are three basic tools to evaluate the maintenance function: a). auditing of the twenty attributes to establish the general situation of this company in connection with the maintenance function. b). strategic diagnosis of the maintenance function to establish the general situation related to the maintenance function. c). implementation of the pareto law to establish those actions that guarantees the success of the future strategy.
Influence of Temperature, Agitation, Sludge Concentration and Solids Retention Time on Primary Sludge Fermentation
J. Sánchez Rubal,J. A. Cortacans Torre,I. del Castillo González
International Journal of Chemical Engineering , 2012, DOI: 10.1155/2012/861467
Abstract: The aim of this research was to determine the influence of temperature, agitation, sludge concentration, and solids retention time (SRT) to obtain readily biodegradable organic matter on primary sludge (PS) fermentation, which would be used as substrate in a biological nutrient removal (BNR) process. Stirring and heating the sludge as well as increasing SRT improved the PS fermentation, producing a large amount of soluble chemical oxygen demand (SCOD). The influence of each operational parameter on PS hydrolysis was observed clearly. A great performance on SCOD production was obtained when the PS was stirred and heated for 3 days. However, PS concentration did not affect the fermentation. Sludge agitation is a simple process with minimal energy consumption. Warming the sludge is very interesting in those plants with anaerobic digestion, where heat energy is obtained from biogas. Therefore, PS fermentation can be improved with a minimum investment and leveraging existing resources in a wastewater treatment plant (WWTP). Fermenter volume can also be reduced if sludge is being heated and stirred during fermentation. 1. Introduction Optimization of wastewater treatment plants (WWTPs) equipped with BNR processes has been taking place in Spain, in recent years, to satisfy the requirements of phosphorus and nitrogen set by the Council Directive of 21 May 1991 concerning urban waste water treatment (91/271/EEC). These requirements are listed in Table 1. Table 1: Requirements for discharges from urban waste water treatment plants to sensitive areas which are subject to eutrophication. Council directive of 21 May 1991 concerning urban waste water treatment (91/271/EEC). The fraction of organic matter that is readily biodegradable, namely, the organic matter that could be metabolized directly by heterotrophic bacteria in anoxic and anaerobic zones is a key parameter on BNR processes. However, the influent of the vast majority of the WWTP contains low readily biodegradable organic matter, particularly in urban plants. Therefore, in many cases, it is impossible to achieve a total nitrogen lower than 10?mg/L in the effluent of WWTP with over 100,000 inhabitants. A supply of readily biodegradable organic matter is required. The supply of readily biodegradable organic matter can be external to the processes that occur in the WWTP. Many commercially available organic compounds, such as methanol or acetic acid, can serve effectively as a carbon source for a BNR process. However, the use of such external carbon sources results in an increase of the operational costs and
Coxalgia crónica: necrosis avascular de la cabeza femoral
Castellano del Castillo,M. A.; González álvarez,A.; Blanco Ramos,M. A.;
Medifam , 2002, DOI: 10.4321/S1131-57682002000100007
Abstract: avascular bone necrosis is a very rare pathological entity that can appears in an primary way or a secondary one due to diverse factors. it can be found in a few levels, especially in the femoral head and the carpal navicular bone in the adult patient. if the lession is located in the femoral head leads to a hip pain, a very frequent clinical manifestation studied in primary health care centers, so it is very important its early and differential diagnosis, above all, in the case that exist risk factors. we present a clinical case of avascular necrosis of the femoral head and perform a current bibliographic revision on the matter.
Comportamiento de infecciones nosocomiales en un período de doce a?os
Ravelo González,Mercedes; Ferrer del Castillo,Elier Alain; Ulloa Espinosa,Caridad; Rodríguez Castro,Osmany;
Revista Cubana de Pediatr?-a , 2008,
Abstract: introduction. this paper is aimed at determining the behavior of nosocomial infections in the neonatology service of the provincial general hospital of morón and at describing the types of infections, the predisposing factors, the isolated microorganisms and the resistance of these germs to the usual antibiotics in our environment. methods. an observational descriptive study was carried out from march 1995 to december 2006. data were obtained by documentary review (medical histories) and they were presented in frequency distribution tables. measurements of central trend (arithmetical mean and median) were made. results. the infection rate observed was 12.3. the generalized sepsis was the most common type of infection and its most important risk factors were low birth weight and prematurity. the coagulase-negative staphylococcus was the most isolated microorganism in microbiological studies. germ growth was obtained in all the studied endotracheal tubes, as well in venous catheters. the gram-positive germs presented an elevated resistance to first-generation penicillins and cephalosporins. conclusions. the nosocomial infections are an important problem in our service and work should be done to optimize the intensive intervention in our patients and to act on its risk factors.
Caracterización anatómica y conductividad hidráulica teórica de los elementos de vaso de variedades silvestres y cultivadas de nopal tunero (Opuntia)
Eulogio Pimienta- Barrios,Sofía Loza Cornejo,María Eugenia González Del Castillo-Aranda
Acta botánica mexicana , 2003,
Abstract: Se estudió la morfología y la conductancia hidráulica teórica de elementos de vaso del xilema en cladodios de especies y variedades cultivadas y silvestres de nopal ( Opuntia spp.) colectados en las regiones semiáridas de los estados de Jalisco y Zacatecas, con el fin de investigar si las diferencias en la resistencia a la sequía que se observan comúnmente en el campo entre especies silvestres y cultivadas de Opuntia pueden estar relacionadas con divergencias en la densidad, la anatomía de los vasos y en la conductividad hidráulica. Adicionalmente se investigó si existen diferencias en el grado de especialización del xilema entre variedades cultivadas y silvestres. Nuestras observaciones mostraron que en la especie cultivada Opuntia ficus-indica (L.) Mill. (variedades amarilla montesa, picochulo, chapeada, pelón liso, burrona y cristalina), así como en las silvestres O. streptacantha Lem. (variedades cardón y charola), O. robusta Wendl. (variedades tapón y tapón de mayo) y O. cochinera Griff., es más frecuente encontrar elementos de vaso con engrosamientos escalariformes y alternos, que los provistos de engrosamientos helicoidales. Las plantas estudiadas no mostraron diferencias morfológicas que indicaran un mayor grado de especialización en las características morfológicas registradas en los elementos de vaso. Los caracteres morfológicos de los elementos de vaso, y los de conductividad hidráulica, no revelan diferencias que puedan ayudar a explicar la mayor resistencia a la sequía en las especies silvestres de nopal en comparación con las cultivadas.
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