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The Numerical and Experimental Analysis of Concrete Bridges of Different Typologies Análisis numérico y experimental de puentes de hormigón de diferentes tipologías
Leonel Osvaldo Pico,María Haydeé Peralta,Norma Luján Ercoli,Salvador La Malfa
Revista Cubana de Ingeniería , 2011, DOI: 10.1234/rci.v2i1.38
Abstract: The increase in vehicular load and velocity over the years has prompted the need for structural modifications of concrete bridges. The measurements and analysis of vibrations in situ along with numerical techniques aid in the global evaluation of these structures by obtaining the dynamic characteristics and corresponding response. These measurements are then compared to international standards and codes in order to formulate superior concrete bridges with the objective of obtaining the influence of the difference in typology on the behavior of bridges. Bridge 1 uses a two way system with beams and deck slabs and bridge 2 is a superior structure composed of pretension T beams and situ-cast concrete deck. These findings are fundamental references in the designing of bridges. El incremento de las cargas y de las velocidades de circulación vehicular de los últimos a os provoca una modificación en el comportamiento estructural de puentes de hormigón entre 30 y 50 a os de vida en servicio. Se originan problemas que no solo se relacionan con la seguridad estructural sino también con el confort, lo cual motiva la necesidad de un monitoreo y evaluación de su comportamiento estructural. La medición y análisis de vibraciones in situ, junto con el uso de técnicas numéricas, permiten realizar la evaluación global de dichas estructuras, a partir de la obtención de las características dinámicas y respuesta correspondiente. Los resultados de las mediciones efectuadas se comparan con normas y criterios actuales existentes a nivel internacional.En el presente trabajo se evalúan dos puentes de hormigón de tablero superior correspondientes a tipologías estructurales diferentes, en un caso emparrillado de vigas y losas llenas y en el otro vigas de hormigón pretensadas tipo doble T y losas llenas hormigonadas in situ, con el objetivo de determinar la influencia de las tipologías en el comportamiento estructural. Los análisis efectuados permiten arribar a conclusiones sobre la relación entre la respuesta estructural y la tipología estructural correspondiente, de interés para el dise o y/o evaluación de puentes.
El Acoso Laboral - Mobbing - Perspectiva Psicologíca
María Claudia Peralta
Revista de Estudios Sociales , 2004,
Abstract: The term "mobbing" migrated to European countries from Scandinabia in the early 1990s. It has been recently studied in Colombia as an interpretation of the persistent, offensive, abusive, intimidating, malicious or insulting behavior and the abuse of power which makes the person feel upset, threatened, humiliated or vulnerable. It undermines their self-confidence and causes them anxiety. In order to contribute to the prevention and constructive management of this problem, this article provides information related to it's causes and consequences and also suggest some ideas about prevention in organizational and individual levels.
Evolución histórica de los rendimientos educativos en México: 1987-2004
Villarreal Peralta, Edna María;
Estudios sociales (Hermosillo, Son.) , 2008,
Abstract: this paper examines the impact of educational level on income wages in mexico, for the period 1987-2004. for this reason, we assess the historical evolution of educational returns using data from the national survey of urban employment (eneu). also, we estimate three alternative models: first, taking years of study as a major explanatory variable; secondly, incorporating variable dummies for kinship and marital status; and, thirdly, considering educational levels. the results obtained show that the highest marginal returns correspond to individuals with higher educational levels. on the other hand, when getting the yields by gender, it seems that those of women surpass men's. finally, a sharp decline in returns during periods of economic crisis, can be observed.
Evolución histórica de los rendimientos educativos en México: 1987-2004
Edna María Villarreal Peralta
Estudios sociales (Hermosillo, Son.) , 2008,
Abstract: En este trabajo se analiza el impacto del nivel educativo sobre el ingreso salarial en México para el periodo 1987-2004. Para ello, se calcula la evolución de los rendimientos educativos empleando datos de la Encuesta Nacional de Empleo Urbano (ENEU). Se estiman tres modelos alternativos: primero, se toman a os de estudio como variable explicativa principal; segundo, se incorporan variables dummies para estado civil y parentesco y, tercero, se consideran niveles educativos. Se obtiene que los mayores rendimientos marginales corresponden a los individuos con nivel educativo más elevado. Asimismo, al estimar los rendimientos por género, se encuentra que los de las mujeres superan a los de los hombres. Por último, aparece una marcada disminución en los rendimientos en los periodos de crisis económica.
ADENOSINA DEAMINASA: SU RESPUESTA ANTE DESEQUILIBRIOS NUTRICIONALES
Feliú,María Susana; Perris,Paula Daniela; Slobodianik,Nora Haydeé;
Revista chilena de nutrición , 2008, DOI: 10.4067/S0717-75182008000300006
Abstract: it has been previously shown that nutritional produces an increment in the activity ofadenosine deaminase (ada) in thymus, serum and otherfluids in immunonocompromised patients. this study analyzed if ada activity could be used as a biochemical indicator of nutritional status in populations at nutritional risk. twenty six women with anorexia nervosa (an) 14-32 years oíd, and 33 obese children (o) 5-13 years oíd were studied. ada activity was determinedas described by giusty and galante, comparing results with control subjects ofthe same age. the results (x±sd, expressed as iu/l) werean: 25.7+8.2 and 21.0 ±4.6*; and 0:27.1+9.1° and 23.0±5.6 in experimental and control individuáis, respectively (*p<0.02). these findings support the hypothesis that ada activity in serum can be used as afunctional indicator related to the defence mechanism in nutritional studies.
ADENOSINA DEAMINASA: SU RESPUESTA ANTE DESEQUILIBRIOS NUTRICIONALES ADENOSINE DEAMINASE IN MALNUTRITION
María Susana Feliú,Paula Daniela Perris,Nora Haydeé Slobodianik
Revista Chilena de Nutricíon , 2008,
Abstract: Se ha demostrado que el estrés nutricional provoca incremento en la actividad de adenosina deaminasa en timo de rata y además aumenta su actividad en el suero y otros fluidos biológicos de pacientes inmunocompro-metidos. En este estudio se analizó si la determinación de la actividad de ADA en suero podría considerarse parámetro bioquímico funcional en el seguimiento de poblaciones en riesgo nutricional. Se estudiaron mujeres con anorexia nerviosa (AN, 14-32 a os) y ni os obesos de ambos sexos (O, 5-13 a os). La actividad de ADA se determinó por el método de Giusti y Galante. Los resultados se compararon con controles de igual edad. Los resultados (X±DE (UI/L)) fueron AN: 25.7±8.2* vs. 21.0±4.6 y O: 27.1±9.1*vs. 23.0±5.6 (*p<0.02). Estos hallazgos, avalarían la hipótesis surgida de estudios previos, de proponer la determinación de la actividad sérica de ADA, como un indicador funcional relacionado con los mecanismos de defensa en los estudios de nutrición. It has been previously shown that nutritional produces an increment in the activity ofadenosine deaminase (ADA) in thymus, serum and otherfluids in immunonocompromised patients. This study analyzed if ADA activity could be used as a biochemical indicator of nutritional status in populations at nutritional risk. Twenty six women with anorexia nervosa (AN) 14-32 years oíd, and 33 obese children (O) 5-13 years oíd were studied. ADA activity was determinedas described by Giusty and Galante, comparing results with control subjects ofthe same age. The results (x±SD, expressed as IU/L) wereAN: 25.7+8.2 and 21.0 ±4.6*; and 0:27.1+9.1° and 23.0±5.6 in experimental and control individuáis, respectively (*p<0.02). These findings support the hypothesis that ADA activity in serum can be used as afunctional indicator related to the defence mechanism in nutritional studies.
Modificación de conducta en un caso de tricotilomanía
María V. De Navarro,Haydeé Aguado M.
Revista Latinoamericana de Psicología , 1981,
Abstract: The behavior of pulling her hair was modified in a 12 . year old girl using positive punishment, DRO, extínctíon, behavioral self-control, and positive reinforcement. The behavior had reached previously high levels and deteriored the girl′s social and fami1y relatlonships, The whole procedure took only SOdays. Social and family relationships improved conliderably. A two-year follow.up indicates the maintenance of the results
Significados, cambios y contexto actual de trabajo: Estudio interpretativo
Peralta-Gómez,María Claudia;
Diversitas: Perspectivas en Psicología , 2012,
Abstract: the present research illustrates how people are giving meaning to the contemporary socio-industrial changes, the new realities on the job organization, and its implications on the construction of the workers' subjectivity. the understanding of this meaning construction leads to the constitution of the individual as a psychological and a social process. the sample for the research is 28 workers from bogotá, with whom interviews were conducted. the interviews were transcribed and interpreted using grounded theory. the results highlight the impact on technology, the legal standards, competition, ethical practices at the current socio labor spectrum and their incidence on the worker who is identified as available, competent and self-demanding at the moment the worker assume a job.
LO PúBLICO Y LO PRIVADO EN LOS PROCESOS DE SELECCIóN DE PERSONAL
Peralta Gómez,María Claudia;
Acta Colombiana de Psicología , 2006,
Abstract: this paper introduces a reflection about organizational psychology practices and their contribution to democracy using a model based upon a public vision. we focus on the social and economical changes inside organizations and the challenges faced by personal selection proccesses in the new organizational context. the goal is to introduce the implicite organizational ideology and its dominant rationality in order to decide which role must be assumed by a professional in this field. the discussion turn around organizational psychologys functions and goals inside society, and the social and communal responsability of this discipline.
Sinopsis del género Junellia (Verbenaceae)
Peralta,Paola; Múlgura,María E.;
Darwiniana , 2011,
Abstract: a sinopsis of genus junellia is here presented, following the recent re-circumscription of the genus based on morphologically founded molecular phylogenetic studies. a key to the 37 junellia species recognized by the latest delimitation of the genus is here proposed, as well as an actualized description of the genus and its differentiation from related genera from tribe verbeneae. nine species and one variety of junellia, never taxonomically treated before, are here described and/or illustrated, or their description is here amended. two new combinations: junellia hookeriana var. catamarcensis (moldenke) p. peralta & n. o'leary and junellia trifida (kunth) p. peralta & n. o'leary, and eight new synonyms are here proposed.
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