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Search Results: 1 - 10 of 14959 matches for " Claudia Marcela; Palacio "
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Análisis de la respuesta mecánica de recubrimientos elaborados mediante proyección térmica por plasma usando la medición de esfuerzos residuales y el método de elementos finitos a escala estructural: efecto de la red de poros
Palacio Espinosa,Claudia Constanza;
Ingeniare. Revista chilena de ingeniería , 2011, DOI: 10.4067/S0718-33052011000300003
Abstract: this study aims a better understanding residual stress and stress field within composite plasma sprayed coatings submitted to strains. in order to reach out this objective, residual stress techniques can be implemented for measurements during elaboration of coatings and finite element analyses (fea) can be conducted on domains resulting from the discretization of scanning electron microscopy (sem) high resolution pictures of coating structures. tio2-cu and al2o3-htio2 plasma sprayed coatings were considered for demonstrative purposes regarding residual stress measurements and effect of the pore network architecture, respectively. several operating parameters permitted to manufacture coatings exhibiting different magnitude of residual stress and several porous architectures, in terms of pore content, crack density and crack orientation. residual stress determined from measurements of deflection during elaboration of tio2-cu coatings allow to identify their nature while numerical simulations show the very significant influence of the network architecture on the stress field within the al2o3-13tio2 coatings. based on the same analyzed structures, other theoretical compositions were considered in the finite element analyses by modifying the intrinsic mechanical properties of the phases. for the considered cases, simulations show the poor influence of the nature of the secondary phase on the stress field within the coatings. beside these results, the paper proposes a generic methodology and points out its advantages and limits, emphasizing in particular the importance of the representative elementary volume (rev).
Análisis de la respuesta mecánica de recubrimientos elaborados mediante proyección térmica por plasma usando la medición de esfuerzos residuales y el método de elementos finitos a escala estructural: efecto de la red de poros Mechanical responses of plasma sprayed coatings from residual stress measurements and finite element analysis: effect of the pore network architecture
Claudia Constanza Palacio Espinosa
Ingeniare : Revista Chilena de Ingeniería , 2011,
Abstract: En el presente trabajo se estudia la respuesta mecánica de recubrimientos elaborados mediante proyección térmica por plasma ante la presencia de esfuerzos residuales y campos de esfuerzos generados por deformaciones. Para lograr este propósito, se midieron los esfuerzos residuales durante el proceso de elaboración de recubrimientos de TiO2-Cu y se evaluó el efecto de la red de poros en la estructura de la capa obtenida a partir de imágenes de alta resolución de Microscopía Electrónica de Barrido (MEB) obtenidas de los recubrimientos de Al2O3-13TiO2, las cuales fueron posteriormente procesadas y discretizadas para su análisis mediante el Método de Elementos Finitos (MEF). Algunos parámetros operacionales empleados para elaborar los recubrimientos, tales como el flujo de gases y la corriente eléctrica, necesarios para formar el plasma, mostraron tener influencia en el contenido de poros, densidad de grietas y orientación de las mismas y en la magnitud de los esfuerzos residuales provocados. Los esfuerzos residuales determinados a partir de mediciones de deflexión durante la elaboración de los recubrimientos de TiO2-Cu, permitieron identificar su naturaleza, mientras que las simulaciones numéricas mostraron la gran influencia de la red de poros sobre el campo de esfuerzos de los recubrimientos de Al2O3-13TiO2. Del mismo modo, mediante MEF se evaluaron otras composiciones teóricas a través de la modificación de las propiedades mecánicas intrínsecas de las fases constituyentes. Para los casos considerados, las simulaciones mostraron la pobre influencia que tiene la presencia de los constituyentes secundarios en el campo de esfuerzos de los recubrimientos. This study aims a better understanding residual stress and stress field within composite plasma sprayed coatings submitted to strains. In order to reach out this objective, residual stress techniques can be implemented for measurements during elaboration of coatings and finite element analyses (FEA) can be conducted on domains resulting from the discretization of Scanning Electron Microscopy (SEM) high resolution pictures of coating structures. TiO2-Cu and Al2O3-HTiO2 plasma sprayed coatings were considered for demonstrative purposes regarding residual stress measurements and effect of the pore network architecture, respectively. Several operating parameters permitted to manufacture coatings exhibiting different magnitude of residual stress and several porous architectures, in terms of pore content, crack density and crack orientation. Residual stress determined from measurements of deflection during elabor
Ibuprofen-Maltodextrin Interaction: Study of Enantiomeric Recognition and Complex Characterization  [PDF]
Claudia Garnero, Carolina Aloisio, Marcela Longhi
Pharmacology & Pharmacy (PP) , 2013, DOI: 10.4236/pp.2013.41003
Abstract:

The interaction between ibuprofen and maltodextrins with different dextrose equivalent was studied in solution and solid state in order to investigate the effect on the solubility of ibuprofen and to determine their usefulness in terms of chiral recognition. Apparent binding constants were calculated using nuclear magnetic resonance spectroscopy experiments and solubility studies. The results showed an increase in the apparent solubility of ibuprofen in the presence of maltodextrins that depended on their ionization state. The freeze-drying method was used to prepare solid complexes, while physical mixtures were obtained by simple blending. These solid systems were characterized in the solid state using differential scanning calorimetry, thermogravimetric analysis, Fourier Transform-Infrared spectroscopy, scanning electron microscopy and X-ray diffractometry. Detailed nuclear magnetic resonance studies provided evidence of the influence of the type and concentration of the maltodextrin host on the chiral recognition of racemic ibuprofen, indicating that these linear ligands act as chiral selectors.

Riesgo operacional: reto actual de las entidades financieras
Arbeláez,Juan Camilo; Franco,Luis Ceferino; Betancur,César; Murillo,Juan Guillermo; Gallego,Paula Andrea; Henao,Viviana María; Londo?o,Johana Andrea; Mejía,Claudia Marcela; Palacio,Diana Marcela; Salazar,Elizabeth; Salazar,Luisa Fernanda; Valderrama,Natalia; Varela,Diana Carolina;
Revista Ingenierías Universidad de Medellín , 2006,
Abstract: its main objective is to succinctly present a description of the models considered the most relevant in the wide range of possibilities for the quantification of operational risk. the article is structured in the following form: first it briefly contextualizes operational risk in the frame of financial risks in general, and in the frame of the current regulations world-wide. in the following section the basic models (basic indicator approach, indicator standard approach and alternative standard approach) proposed for the quantification of the operational risk are described. then it describes the minimum general, qualitative and quantitative requirements, in the light of the new basilea agreement, that should be met by the advanced measurement approach that financial organizations try to submit to approval of the regulating institutions. later, it shows some recent specific local and world-wide studies and finally some conclusions are obtained.
Metaphor Identification in EFL Argumentative Writing: A Corpus-driven Study
Chapetón,Claudia Marcela;
Folios , 2010,
Abstract: this article reports research investigating instances of linguistic metaphor in contextualized corpus data. since the issue of metaphor identification in naturally-occurring data has been reason of current debate among cognitive and applied linguists, this paper focuses particularly on the process of identification of this type of language in corpus data and proposes a combined procedure for metaphor identification. the findings inform about the presence and word class of metaphorical language in the argumentative writing of efl university students. implications and directions for future research are highlighted.
Análisis de citación y de redes sociales para el estudio del uso de revistas en centros de investigación: an approach to the development of collections
González, Claudia Marcela;
Ciência da Informa??o , 2009, DOI: 10.1590/S0100-19652009000200004
Abstract: the objective of this article is to present a methodological approach to the study of use of journals by researchers. in addition to the technique of analysis of citation and analysis of social nets, bibliometrical maps are elaborated which proportionate capacity of synthesis of complex information. their utilization in evaluating collections would bring in valuable information for the equitatifve distribution of the economic resources alloted to the purchase of tittles and optimization of their availability and access.
Reading the world as a literacy practice: A teacher's reflection
Chapetón,Claudia Marcela;
Colombian Applied Linguistics Journal , 2004,
Abstract: this article attempts to share with the reader a reading club program that was developed for a group of adults in situation of displacement in bogotá, colombia. it is framed in the context of forced internal displacement which is a critical social situation our country has been suffering lately and it is somehow, shaping our current, local teaching practices. the reflections presented in this article are focused both, on the critical theories of pedagogy and on my experience as teacher researcher in the creation and development of a reading club at "red de solidaridad social", bogotá.
Significado de la Paternidad en Adolescentes Varones del Sector Sur-Oriente de Santiago
Cruzat,Claudia; Aracena,Marcela;
Psykhe (Santiago) , 2006, DOI: 10.4067/S0718-22282006000100003
Abstract: this study aims to reconstruct fatherhood meaning in adolescent males, its sources of influence and its relationship with the personal experience. a qualitative descriptive analytic-relational design was used, based on grounded theory (glaser & strauss, 1967), using semi-structured interviews, with a sample of 40 adolescents (20 parents and 20 non-parents). the main results and conclusions show that adolescent fatherhood is a topic full of contradictions and scarcely divulged, generating disorientation and helplessness; it causes a breakdown in the person's life project and promotes restructuring. it is understood by the adolescents as a process and it depends on many external and internal variables, leading to a conditioned fatherhood.
Consideraciones éticas de la tecnología de asistencia en personas en condición de discapacidad: Posibilitar o limitar la autonomía?
Rozo Reyes,Claudia Marcela;
Revista Latinoamericana de Bioética , 2010,
Abstract: objective: to review the autonomy as a subject of reflection, from the use of assistive technology in people with disability and arguing the limitations on self-government can be showed based on bioethical perspective. methodology: through a careful analysis of the data, shows the arguments of authors who have reviewed the autonomy and considerations on the use of assistive technology for people with disability. conclusions and discussion: assistive technology as a resource allows people to be independent in performing some activities of daily living, but their use can have negative effects on their lives, by problems with the loss of privacy, exclusion and isolation, marginalization and stigmatization among others, which are negative effects on social integration processes of the person with disability. shows the technological paternalism as a process of control over lives of individuals, generating decrease in autonomy that aims to generate in the rehabilitation of the patient.
Identificación de Lenguaje Metafórico en textos argumentativos en inglés como lengua extranjera: un estudio de corpus Metaphor Identification in EFL Argumentative Writing: A Corpus-driven Study
Claudia Marcela Chapetón
Folios , 2010,
Abstract: Este artículo reporta un estudio de instancias de lenguaje metafórico en datos contextualizados enmarcados en la lingüística del corpus. Dado que el problema de la identificación del lenguaje metafórico se ha constituido como causa de debate entre estudiosos de la lingüística cognitiva y la lingüística aplicada, este artículo se enfoca principalmente en los procesos de identificación de este tipo de lenguaje en datos auténticos de corpus, y propone un procedimiento combinado aplicable a este tipo de análisis. Los resultados informan acerca de la presencia del lenguaje metafórico y su clasificación gramatical en textos argumentativos escritos por estudiantes universitarios de inglés como lengua extranjera. El artículo discute las implicaciones de este estudio y propone posibles direcciones para futuras investigaciones. This article reports research investigating instances of linguistic metaphor in contextualized corpus data. Since the issue of metaphor identification in naturally-occurring data has been reason of current debate among cognitive and applied linguists, this paper focuses particularly on the process of identification of this type of language in corpus data and proposes a combined procedure for metaphor identification. The findings inform about the presence and word class of metaphorical language in the argumentative writing of EFL university students. Implications and directions for future research are highlighted.
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