Maria Vargas | Universidad El Bosque (original) (raw)
Papers by Maria Vargas
International Journal of Human-computer Studies / International Journal of Man-machine Studies, 1994
Much of the skill of Prolog programming comes from the ability to harness its comparatively simpl... more Much of the skill of Prolog programming comes from the ability to harness its comparatively simple syntax in sophisticated ways. It is possible to provide an account of part of the activity of Prolog programming in terms of the application of techniques|standard patterns of program development which may be applied to a variety of di erent programming problems. Numerous researchers have attempted to provide formal de nitions of Prolog techniques|for example, )|but there has been little standardization of the approach and the computational use of techniques has been limited to small portions of the programming task. We demonstrate that techniques knowledge can be used to support programming in a wide variety of areas: editing, analysis, tracing, transformation and techniques acquisition. We summarize the main features of systems implemented by the authors for each of these types of activity and set these in the context of previous work, using a standard style of presentation. We claim that a techniques-based system which integrates these features would be worth more than the sum of its parts, since the same techniques knowledge can be shared by the di erent subsystems.
Food Hydrocolloids, 2009
Edible films based on high molecular weight chitosan (CH) and different concentrations of oleic a... more Edible films based on high molecular weight chitosan (CH) and different concentrations of oleic acid (OA) were prepared. Film-forming dispersions (FFD) were characterized in terms of rheological properties, surface tension, particle size distribution and z-potential. In order to study the impact of the incorporation of OA into the CH matrix, the water sorption isotherms, water vapour permeability (WVP), mechanical properties, and optical properties of the dry films were evaluated. Results showed that the increase in OA promoted changes in the size and surface charge of the FFD particles, which had an impact on the rheological properties of the FFD. As regards the film properties, the higher the OA content, the lower the WVP and the moisture sorption capacity. In general, the addition of OA into the CH matrix leads to a significant increase in gloss and translucency and a decrease in the tensile strength, elongation at break and elastic modulus of the composite films. The mechanical and optical properties of the films were related with their microstructure, which was observed by SEM. r
Food Hydrocolloids, 2009
Edible films based on high molecular weight chitosan (CH) and different concentrations of oleic a... more Edible films based on high molecular weight chitosan (CH) and different concentrations of oleic acid (OA) were prepared. Film-forming dispersions (FFD) were characterized in terms of rheological properties, surface tension, particle size distribution and z-potential. In order to study the impact of the incorporation of OA into the CH matrix, the water sorption isotherms, water vapour permeability (WVP), mechanical properties, and optical properties of the dry films were evaluated. Results showed that the increase in OA promoted changes in the size and surface charge of the FFD particles, which had an impact on the rheological properties of the FFD. As regards the film properties, the higher the OA content, the lower the WVP and the moisture sorption capacity. In general, the addition of OA into the CH matrix leads to a significant increase in gloss and translucency and a decrease in the tensile strength, elongation at break and elastic modulus of the composite films. The mechanical and optical properties of the films were related with their microstructure, which was observed by SEM. r
Food Hydrocolloids, 2009
Edible films based on high molecular weight chitosan (CH) and different concentrations of oleic a... more Edible films based on high molecular weight chitosan (CH) and different concentrations of oleic acid (OA) were prepared. Film-forming dispersions (FFD) were characterized in terms of rheological properties, surface tension, particle size distribution and z-potential. In order to study the impact of the incorporation of OA into the CH matrix, the water sorption isotherms, water vapour permeability (WVP), mechanical properties, and optical properties of the dry films were evaluated. Results showed that the increase in OA promoted changes in the size and surface charge of the FFD particles, which had an impact on the rheological properties of the FFD. As regards the film properties, the higher the OA content, the lower the WVP and the moisture sorption capacity. In general, the addition of OA into the CH matrix leads to a significant increase in gloss and translucency and a decrease in the tensile strength, elongation at break and elastic modulus of the composite films. The mechanical and optical properties of the films were related with their microstructure, which was observed by SEM. r
Journal of Infectious Diseases, 2005
Background-We performed a study to better characterize the natural history of genital human papil... more Background-We performed a study to better characterize the natural history of genital human papillomavirus (HPV) infection in a cohort of closely followed adolescent women.
Journal of Infectious Diseases, 2005
Background-We performed a study to better characterize the natural history of genital human papil... more Background-We performed a study to better characterize the natural history of genital human papillomavirus (HPV) infection in a cohort of closely followed adolescent women.
El propo cito de este trabajo es de dar a conocer algunos de los temas que se encuentran en el li... more El propo cito de este trabajo es de dar a conocer algunos de los temas que se encuentran en el libro de Edipo rey y antigona.
International Journal of Human-computer Studies / International Journal of Man-machine Studies, 1994
Much of the skill of Prolog programming comes from the ability to harness its comparatively simpl... more Much of the skill of Prolog programming comes from the ability to harness its comparatively simple syntax in sophisticated ways. It is possible to provide an account of part of the activity of Prolog programming in terms of the application of techniques|standard patterns of program development which may be applied to a variety of di erent programming problems. Numerous researchers have attempted to provide formal de nitions of Prolog techniques|for example, )|but there has been little standardization of the approach and the computational use of techniques has been limited to small portions of the programming task. We demonstrate that techniques knowledge can be used to support programming in a wide variety of areas: editing, analysis, tracing, transformation and techniques acquisition. We summarize the main features of systems implemented by the authors for each of these types of activity and set these in the context of previous work, using a standard style of presentation. We claim that a techniques-based system which integrates these features would be worth more than the sum of its parts, since the same techniques knowledge can be shared by the di erent subsystems.
Food Hydrocolloids, 2009
Edible films based on high molecular weight chitosan (CH) and different concentrations of oleic a... more Edible films based on high molecular weight chitosan (CH) and different concentrations of oleic acid (OA) were prepared. Film-forming dispersions (FFD) were characterized in terms of rheological properties, surface tension, particle size distribution and z-potential. In order to study the impact of the incorporation of OA into the CH matrix, the water sorption isotherms, water vapour permeability (WVP), mechanical properties, and optical properties of the dry films were evaluated. Results showed that the increase in OA promoted changes in the size and surface charge of the FFD particles, which had an impact on the rheological properties of the FFD. As regards the film properties, the higher the OA content, the lower the WVP and the moisture sorption capacity. In general, the addition of OA into the CH matrix leads to a significant increase in gloss and translucency and a decrease in the tensile strength, elongation at break and elastic modulus of the composite films. The mechanical and optical properties of the films were related with their microstructure, which was observed by SEM. r
Food Hydrocolloids, 2009
Edible films based on high molecular weight chitosan (CH) and different concentrations of oleic a... more Edible films based on high molecular weight chitosan (CH) and different concentrations of oleic acid (OA) were prepared. Film-forming dispersions (FFD) were characterized in terms of rheological properties, surface tension, particle size distribution and z-potential. In order to study the impact of the incorporation of OA into the CH matrix, the water sorption isotherms, water vapour permeability (WVP), mechanical properties, and optical properties of the dry films were evaluated. Results showed that the increase in OA promoted changes in the size and surface charge of the FFD particles, which had an impact on the rheological properties of the FFD. As regards the film properties, the higher the OA content, the lower the WVP and the moisture sorption capacity. In general, the addition of OA into the CH matrix leads to a significant increase in gloss and translucency and a decrease in the tensile strength, elongation at break and elastic modulus of the composite films. The mechanical and optical properties of the films were related with their microstructure, which was observed by SEM. r
Food Hydrocolloids, 2009
Edible films based on high molecular weight chitosan (CH) and different concentrations of oleic a... more Edible films based on high molecular weight chitosan (CH) and different concentrations of oleic acid (OA) were prepared. Film-forming dispersions (FFD) were characterized in terms of rheological properties, surface tension, particle size distribution and z-potential. In order to study the impact of the incorporation of OA into the CH matrix, the water sorption isotherms, water vapour permeability (WVP), mechanical properties, and optical properties of the dry films were evaluated. Results showed that the increase in OA promoted changes in the size and surface charge of the FFD particles, which had an impact on the rheological properties of the FFD. As regards the film properties, the higher the OA content, the lower the WVP and the moisture sorption capacity. In general, the addition of OA into the CH matrix leads to a significant increase in gloss and translucency and a decrease in the tensile strength, elongation at break and elastic modulus of the composite films. The mechanical and optical properties of the films were related with their microstructure, which was observed by SEM. r
Journal of Infectious Diseases, 2005
Background-We performed a study to better characterize the natural history of genital human papil... more Background-We performed a study to better characterize the natural history of genital human papillomavirus (HPV) infection in a cohort of closely followed adolescent women.
Journal of Infectious Diseases, 2005
Background-We performed a study to better characterize the natural history of genital human papil... more Background-We performed a study to better characterize the natural history of genital human papillomavirus (HPV) infection in a cohort of closely followed adolescent women.
El propo cito de este trabajo es de dar a conocer algunos de los temas que se encuentran en el li... more El propo cito de este trabajo es de dar a conocer algunos de los temas que se encuentran en el libro de Edipo rey y antigona.