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Search Results: 1 - 10 of 95085 matches for " Ma José Casas Carriazo "
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Effectiveness of a nursing intervention during transfusion of packed red cells on the patient′s anxiety state receiver
Jesús Fernando Martín Díaz,Ma Jesús Hidalgo Gutiérrez,Ma Fátima Cerezo Solana,Ma José Casas Carriazo
NURE Investigación , 2012,
Abstract: The transfusion provokes anxiety and this one compromises the improvement of the patient. Objetive: The study aims to evaluate whether a nursing intervention protocol-through oral and written submissions previous to the transfusion of packed red blood cells decreases anxiety levels in pretransfusion and postransfusion recipient patients through a randomized clinical trial. Methodology: Be conducted in patients over 18 years admitted in the Hospitable complex of Toledo, prescription transfusion of packed red blood cells. For an alpha error 0.05, beta error of 0.90, with an expected effect of 10%, need 70 subjects in each group. The allocation to the intervention group and the control group was randomly made simple. The performance in the normal control group will be done in the hospital, patients receiving transfusion. As dependent variables evaluated:- The anxiety level pretransfusion and postransfusion. Using the questionnaire was validated by Spielberger (STAI). - The level of satisfaction perceived by the user on the information received prior to transfusion. By design developed for this study. Also recorded other control variables: sex, age, socio-cultural level, marital status, reason for transfusion, or no knowledge of the prescription of transfusion, incidents during transfusion.Scientific and sociosanitary relevancy of the study: The results will allow to know if the transfusion increases the anxiety and if an educational intervention nurse can diminish it; and to do the intervention before every transfusion.
Laboratory projects using inquiry-based learning: an application to a practical inorganic course
Carriazo, José G.;
Química Nova , 2011, DOI: 10.1590/S0100-40422011000600029
Abstract: this paper reports how laboratory projects (lp) coupled to inquiry-based learning (ibl) were implemented in a practical inorganic chemistry course. several coordination compounds have been successfully synthesised by students according to the proposed topics by the lp-ibl junction, and the chemistry of a number of metals has been studied. qualitative data were collected from written reports, oral presentations, lab-notebook reviews and personal discussions with the students through an experimental course with undergraduate second-year students at the universidad nacional de colombia during the last 5 years. positive skills production was observed by combining lp and ibl. conceptual, practical, interpretational, constructional (questions, explanations, hypotheses), communicational, environmental and application abilities were revealed by the students throughout the experimental course.
Una estimación del número de siniestros en el seguro del automóvil: Comparación entre distintos modelos.
Melgar Hiraldo, Ma Carmen,Ordaz Sanz, José Antonio,Guerrero Casas, Flor María
Rect@ , 2004,
Abstract: El seguro del automóvil constituye uno de los principales ramos del conjunto de la actividad aseguradora; en concreto, en el a o 2003 representa en Espa a el 25,65% del total de ésta, siendo así el más importante dentro del seguro de no vida. Una de las preocupaciones básicas de este sector es la estimación del número de siniestros que se producen. En el desarrollo de esta tarea, se emplean modelos econométricos tipo count data; en este sentido, suelen utilizarse habitualmente el modelo de Poisson o el binomial negativo. Sin embargo, modelos como los inflados de ceros pueden resultar más adecuados al tener en cuenta determinados aspectos relativos a los valores nulos de la variable endógena, que los otros no consideran. El objetivo fundamental del presente trabajo es mostrar los factores más significativos en la ocurrencia de siniestros declarados por los conductores. A partir de los datos suministrados por cierta entidad aseguradora privada, se lleva a cabo la estimación del número de siniestros a través de cada uno de los modelos anteriormente mencionados y se comparan los resultados obtenidos.
Thermal and structural study of guava (Psidium guajava L) powders obtained by two dehydration methods
Osorio, Coralia;Carriazo, José G.;Barbosa, Helber;
Química Nova , 2011, DOI: 10.1590/S0100-40422011000400016
Abstract: two food products (powders) were obtained by hot-air drying or lyophilisation methods on the whole guava fruits. the powders were characterised by sensory and thermal analyses (tga-dsc), infrared spectroscopy (ir), x-ray diffraction (xrd) and scanning electron microscopy (sem). thermal, morphological and structural characterisations showed a similar behaviour for the two solids. tga-dsc and ir showed the presence of pectin as the main constituent of solids. a semi-crystalline profile was evidenced by xrd, and lamellar/spherical morphologies were observed by sem. sensory analyses revealed an aroma highly related to guava. these value-added food products are an alternative to process guava and avoid loss during postharvest handling.
CARACTERIZACIóN ESTRUCTURAL Y TEXTURAL DE UNA BENTONITA COLOMBIANA
Carriazo,José; Molina,Rafael; Moreno,Sonia;
Revista Colombiana de Química , 2007,
Abstract: in the present work a colombian bentonite (from valle del cauca) was characterized by x-ray diffraction, spectroscopic techniques (ir, nmr and epr) and textural analysis. the results indicate that dioctahedral (aluminian) smectite is the principal component in the natural material. in addition, both 29si nmr and 27al nmr analysis reveal the isomorphous substitution of al3+ by si4+ in the tetrahedral sheet. the epr study shows iron (iii) in octahedral sheet positions of the clay mineral besides ?nanoclusters? probably in oxides or oxyhydroxides form. the textural analysis indicates that the bentonite is predominantly a mesoporous material.
EVALUACIóN DEL EFECTO DE LA IMPREGNACIóN DE PLATINO SOBRE LAS CARACTERíSTICAS SUPERFICIALES Y ESTRUCTURALES DE UNA ZEOLITA Y
Carriazo,José; Barrera,Mario; Almanza,Ovidio;
Revista Colombiana de Química , 2007,
Abstract: the present paper shows the evaluation of texture, surface and structure changes on a zeolite y employed in the synthesis of solids based on supported platinum. the structure features were analyzed by x-ray diffraction (xrd) whereas the texture and morphologic properties were studied from nitrogen adsorption isotherms (77k) and scanning electron microscopy (sem). in addition, fractal dimension and adsorption potential distribution were determinedall solids. the results show that the synthesis process induces the microporosity formation, maintaining the zeolite structure and without important topographic or energetic alterations on the surface.
CARACTERIZACIóN TéRMICA Y ESPECTROSCóPICA DE ARCILLAS PILARIZADAS CON SOLUCIONES POLIHIDROXOCATIóNICAS DE Al, Ce, Fe
Carriazo,José; Molina,Rafael; Moreno,Sonia;
Revista Colombiana de Química , 2008,
Abstract: this work shows the characterization by ir spectroscopy, thermogravimetric analysis (tga), differential thermal analysis (dta) and nuclear magnetic resonance spectroscopy (29sinmrand 27al nmr) of a set of pillared clays synthesized with al, al-fe, al-ce or al-ce-fe polyhydroxocationic solutions. tgadta analyses indicate a favorable thermal effect (higher thermal stability) when ce, fe or ce-fe are added. ir and 29si nmr results reveal a probable formation of a bond between the alumina pillar and the clay (sio4)-tetrahedral sheet, whereas the 27al nmr does not evidence any isomorphous substitution of iron or cerium in the alumina pillars. moreover, by ir spectroscopy was not observed any structural difference between solids pillared with al and those pillared with al-ce, showing that cerium is possibly incorporated in an independent way to the alumina pillar.
Actitudes hacia la química de estudiantes de diferentes carreras universitarias en Colombia
Molina, Manuel F;Carriazo, José G;Farías, Diana M;
Química Nova , 2011, DOI: 10.1590/S0100-40422011000900032
Abstract: this work reports a study on the attitudes of colombian students towards chemistry in different undergraduate programs. the research was performed on 769 students belonging to several chemistry courses, by applying an adaptation of salta and tzougraki's test and using likert's scale. the results revealed that chemistry is being considered as difficult and little useful, but very interesting. thus, the difficulty to learn chemistry may be associated with its language and abstract conceptual nature. in addition, more attention should be given to the class contents and methodologies provided to the students, in order to engage them with those interest aspects and meaningful topics of each program
Impregnación de platino y dimensión fractal en dos tipos de sólidos microporosos
Carriazo,José G.; Barrera-Vargas,Mario; Molina,Manuel F.;
Revista Ingenierías Universidad de Medellín , 2010,
Abstract: this research shows the modification of a zeolite y and a pillared clay (saponite) by impregnation with different platinum quantities (synthesis of pt catalysts). the solids were characterized about the chemical composition and texture. the textural characterization reveals important changes in the solids, showing that in the zeolitic catalysts microporosity is formed, whereas in the pillared clay the microporous structures are partially blocked. fractal dimension (by avnir-jaroniec method) indicates that the topographic features of the pillared clay surface are significantly affected due to the modification with platinum, probably as a consequence of platinum clusters formation.
Impregnación de platino y dimensión fractal en dos tipos de sólidos microporosos Platinum impregnation and fractal dimension on two types of micro-porous solids
José G. Carriazo,Mario Barrera-Vargas,Manuel F. Molina
Revista Ingenierías Universidad de Medellín , 2010,
Abstract: El presente trabajo muestra la modificación de una zeolita-Y y una arcilla pilarizada (tipo saponita) mediante impregnación con diferentes cargas de Pt (catalizadores a base de Pt). Los sólidos se caracterizaron en cuanto a su composición química y su textura. La caracterización textural revela cambios importantes en los sólidos, mostrando que se genera microporosidad en la serie de catalizadores zeolíticos y se bloquean las estructuras microporosas en la serie de catalizadores obtenidos a partir de la arcilla pilarizada. La determinación de la dimensión fractal (mediante el método de Avnir-Jaroniec) indica que la modificación con Pt afecta significativamente las características topográficas de la superficie de la arcilla pilarizada como consecuencia de la posible formación de agregados de Pt. This research shows the modification of a zeolite Y and a pillared clay (saponite) by impregnation with different platinum quantities (synthesis of Pt catalysts). The solids were characterized about the chemical composition and texture. The textural characterization reveals important changes in the solids, showing that in the zeolitic catalysts microporosity is formed, whereas in the pillared clay the microporous structures are partially blocked. Fractal dimension (by Avnir-Jaroniec method) indicates that the topographic features of the pillared clay surface are significantly affected due to the modification with platinum, probably as a consequence of platinum clusters formation.
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