Influência da adição no comportamento reológico da pasta autoadensável de alto desempenho

Influence of admixture on the rheological behavior of high performance self-compacting paste. This research proposes to study the influence of the specific area, mould and surface texture of admixtures on the rheological behavior of high performance self-compacting paste (HPSCP). The selected admixtures are calcareous filler and basalt filler, which are industrial residues, thus contributing to sustainable development. The paste is made up of cement, silica fume, calcareous filler or basalt filler, water and superplasticizer additive. For this study, the water/cement ratios are fixed = 0.40 L kg(-1); silica fume/cement = 0.10 kg kg(-1); the filler/cement and superplasticizer/cement ratios are determined through Marsh cone and mini-slump tests. The results show that for same filler/cement ratios, the ratios of superplasticizer to paste with calcareous filler are significantly lower than those of paste with basalt filler. The results show that the specific area, mould and surface texture of these admixtures significantly influence the rheological behavior of HPSCP.

Resistência à compressão do concreto autoadensável: Influência da atividade pozolânica do calcário e do basalto

This research studies the influence of the pozzolanic activity of the calcareous and basalt in the resistence behavior of the compressive strength of high performance self-compacting concrete (HPSCC). The selected aditives are the calcareous filler and basalt filler, for they are industrial residues helping that way the sustainable development. The paste of this concrete type is constituted of cement, silica fume, calcareous filler or basalt filler, water and superplasticizer additive. In this research the relationships water/cement are fixed in 0,40 kg/kg, silica fume/cement of 0,10 kg/kg and the relationships filler/cement and superplasticizer/cement are determined through of Marsh́s cone and mini-slump tests. The granular skeleton is gotten from a composition between quartzous sand and brita of basalt that presents the lesser index of emptinesses. The results show that the HPSCC with the addition of calcareous filler has greater compressive strength than what the HPSCC with addition of basalt filler in the ages of 7, 28 and 63 days. It is explained by the fact that the calcareous filler presents greater index of pozzolanic activity than the basalt filler. Besides that the relation water/fine for the HPSCC with calcareous filler is 0,27 l/kg whereas the HPSCC with basalt filler is of 0,29 l/kg.

Adaptação transcultural do questionário para avaliação das atitudes dos pais com relação a saúde bucal dos filhos

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Fatores envolvidos no comportamento em higiene bucal e hábitos alimentares de crianças: revisão de literatura

The family is primarily responsible for shaping behavior in oral hygiene and nutrition of children, and cultural and psychosocial factors can influence this process. Thus, we carried out this study with the aim of presenting evidence from the literature on the subject. We reviewed the databases Bireme, Pubmed and Medline without restriction of year of publication. Used as descriptors "education," "care," "behavior," "oral health" and "food habits". We emphasize the responsibility of the family practices, values and beliefs of oral health and nutrition as well as the importance of shared care between family and professionals.

Enseñanza y Aprendizaje en la Universidad: Representaciones Sociales que construyen los docentes de la Licenciatura en Trabajo Social de la UNaM. 16H360

El presente proyecto pretende continuar con la línea de investigación que se iniciara con el proyecto “La formación en Educación Especial en la UNAM, conceptualizaciones y paradigmas” (16H-157). Posteriormente, “La Formación de Docentes Reflexivos en el Profesorado de Educación Especial: análisis crítico desde la mirada de egresados y estudiantes” (16H-188) y “La Formación de Docentes Críticos y Reflexivos en el Profesorado de Educación Especial: Representaciones Sociales de los Docentes” (16 H 235). Ambos, referidos a la docencia universitaria en ámbitos de la Facultad de Humanidades y Ciencias Sociales, nos posibilitaron conocer aspectos relevantes de la formación profesional docente que se desarrolla a través de la propuesta curricular del Profesorado en Educación Especial. En la presente oportunidad, nuestro eje de indagación se amplía a otra Carrera de la misma Unidad Académica con la intención de abordar las representaciones sociales que construyen los docentes de la Licenciatura en Trabajo Social con relación a las nociones de Enseñanza y Aprendizaje en la Universidad. En tal sentido, por un lado se construirá conocimiento desde una particular mirada hacia las formas que adquiere la vinculación entre enseñanza y aprendizaje, adentrándonos en los posibles modelos construidos sobre la identidad profesional, y por otro, identificar y analizar fundadamente los saberes que circulan en dicho espacio de formación profesional para poder ponerlos en tensión. El interés en el tema se vincula con el anclaje y la trayectoria que posee la citada carrera, habiendo sido una de las fundantes de la Universidad Nacional de Misiones en la Década de 1970. Además, el interés está dado en que desde el año 2010 se encuentra en un proceso de inauguración de un nuevo plan de estudios (Resolución N°002/10), precedido por uno vigente desde 1999 al cual, a su vez, lo precedió la propuesta curricular implementada desde 1982. Los argumentos que dieron lugar al último cambio de Plan de Estudios provinieron de sucesivas evaluaciones, principalmente del claustro docente, al no encontrarse cumplidos los objetivos planteados. A su vez, los resultados alcanzados hasta el momento con la nueva propuesta ya expresan nuevas preocupaciones en el mismo claustro en relación a los resultados que se observan en la formación, tanto en términos cualitativos como en términos cuantitativos, destacándose en el ciclo 2011, por ejemplo, la deserción de alrededor del 50% de los estudiantes inscriptos en cada una de las Asignaturas, según los registros proporcionados por la Dirección Alumnado de la Facultad. Estas cuestiones ya han ido emergiendo desde momentos anteriores y recibieron diferentes tratamientos como ser proyectos de investigación y de extensión, dirigidos tanto hacia los estudiantes, a través de cuestiones vinculadas con la situación de ingreso a la universidad, como hacia los docentes, apuntando a los paradigmas de la profesión y sus relevancias según momentos históricos de la misma. Pero, desde la perspectiva que proponemos en el presente proyecto, es decir, abordando cuestiones propias de la práctica docente y de formación profesional en contextos universitarios, no hallamos en la Carrera antecedentes que lo hayan abordado. Es por ello que, partimos de la necesidad de poner en cuestión las condiciones de producción de las prácticas docentes en la formación de profesionales Licenciados en Trabajo Social en la UNaM. Nuestra propuesta de indagación se fundamenta en cuestiones propias del campo de la docencia universitaria desde donde es posible afirmar que la construcción de lo disciplinar en la formación de profesionales opera en base a modelos, creencias y valores que sustentan los sujetos que participan de la acción de enseñanza, los cuales, por lo general, circulan de modo inconsciente o implícito. De allí que, nos planteamos como principal interrogante: ¿Cuál es el estado de las RS y otros saberes construidos por los sujetos docentes pertenecientes al escenario seleccionado, y cuáles son sus trayectorias profesionales docentes que los habilitan y sostienen, es decir, que los producen y reproducen? Las investigaciones previas desarrolladas por este equipo de trabajo y los hallazgos producidos a través de cada una de ellas, nos indica como apropiado sustentar teórica y metodológicamente esta investigación en los marcos conceptuales desarrollados por Serge Moscovicci y sus seguidores, dado que la Teoría de las Representaciones Sociales constituye un referencial apropiado para la indagación, en tanto permite identificar y analizar a través de los discursos de lo sujetos, los conocimientos, saberes, valores, habilidades, destrezas y actitudes que se ponen en juego en el escenario profesional docente cotidiano. Otros aportes teóricos provienen de las producciones de Alfred Schütz (1993), referidos a la comprensión de la vida de sentido común; de Schön (1992), Carr y Kemmis (1988) referidas a la Articulación Teoría-Práctica; y consideraciones en torno a las nociones de enseñanza y aprendizaje en la Enseñanza Superior de Autores tales como, Brockbank y McGill (2002) y Berstein (1990). Pretendemos con nuestra indagación, en una primera aproximación, reflejar aspectos de la formación profesional en Trabajo Social en el campo de la docencia universitaria, las posibles vinculaciones entre formación docente y sus prácticas, capturando los discursos que circulan en las producciones científicas y académicas actuales. Y, en un segundo momento, formular interrogantes que nos habiliten continuar posteriormente en otro proyecto ahondando las posibles relaciones entre las prácticas de enseñanza y los procesos de aprendizaje que pudieran expresar los estudiantes.

La basílica y el baptisterio de Tolmo de Minateda (Hellín, Albacete)

Se presenta el complejo religioso exhumado en la parte alta de la ciudad altomedieval del Tolmo de Minateda (Hellín, Albacete), correspondiente a la Madînat Iyih de las fuentes árabes y, en opinión de los autores, a la sede episcopal Eiotana/Elotana creada a principios del siglo VII. El conjunto religioso está compuesto por una basílica de tres naves con ábside semicircular y un baptisterio anexo situado a los pies del edificio, también con distribución tripartita. En este artículo se estudia detalladamente el baptisterio, así como las distintas remodelaciones de la piscina bautismal, y se propone una restitución del espacio litúrgico.

Ectopic Meis1 expression in the mouse limb bud alters P-D patterning in a Pbx1-independent manner

During limb development, expression of the TALE homeobox transcription factor Meis1 is activated by retinoic acid in the proximal-most limb bud regions, which give rise to the upper forelimb and hindlimb. Early subdivision of the limb bud into proximal Meis-positive and distal Meis-negative domains is necessary for correct proximo-distal (P-D) limb development in the chick, since ectopic Meis1 overexpression abolishes distal limb structures, produces a proximal shift of limb identities along the P-D axis, and proximalizes distal limb cell affinity properties. To determine whether Meis activity is also required for P-D limb specification in mammals, we generated transgenic mice ectopically expressing Meis1 in the distal limb mesenchyme under the control of the Msx2 promoter. Msx2:Meis1 transgenic mice display altered P-D patterning and shifted P-D Hox gene expression domains, similar to those previously described for the chicken. Meis proteins function in cooperation with PBX factors, another TALE homeodomain subfamily. Meis-Pbx interaction is required for nuclear localization of both proteins in cell culture, and is important for their DNA-binding and transactivation efficiency. During limb development, Pbx1 nuclear expression correlates with the Meis expression domain, and Pbx1 has been proposed as the main Meis partner in this context; however, we found that Pbx1 deficiency did not modify the limb phenotype of Msx2:Meis1 mice. Our results indicate a conserved role of Meis activity in P-D specification of the tetrapod limb and suggest that Pbx function in this context is either not required or is provided by partners other than Pbx1.

Paleoenvironmental implications of the Indidura Formation (Cenomanian/Turonian), northeastern Mexico: A high resolution stratigraphic study

High-resolution lithostratigraphic data from rock sequences known as the Indidura Formation near Parras de La Fuente, Coahuila, NE Mexico, led to achieve a significant improvement of our knowledge of that Formation. The results of this study indicate for the first time that the sequence at Parras de La Fuente developed from the deposition of calcareous cyanobacterial microspheroids that accumulated under perennial blooms during the Late Cenomanian through the Middle Turonian. Multi-proxy analyses included sedimentological, petrographical, scanning electron microscopy, stable isotope, trace element geochemistry, and paleontological data. The combined results allowed the correlation of δ13C and anomalies in Mo, V, and Cr with the abundance and predominance of calcareous cyanobacterial microspheroids, which were the main suppliers of the carbonate components and the organic matter throughout deposition of the Indidura Formation in the Parras de la Fuente area, under dysoxic/anoxic conditions. Conspicuous interbeds of dark and light-gray laminated marly calcilutites, and dark-gray marlstones that characterize the stratigraphic sequence formed in response to external forcing climatic factors of millennial-scale Milankovitch cycles (ca. 20 ka precession). At the microscopic level, the prominent dark and light-gray laminae were formed during cycles similar to the 10 to 15 years solar irradiance maximum, and represent alternating periods of high and low calcareous cyanobacterial microspheroids productivity.

Paleoenvironmental Implications of the Indidura Formation (Cenomanian/Turonian), Northeastern Mexico: a High Resolution Stratigraphic Study

High-resolution lithostratigraphic data from rock sequences known as the Indidura Formation near Parras de La Fuente, Coahuila, NE Mexico, led to achieve a significant improvement of our knowledge of that Formation. The results of this study indicate for the first time that the sequence at Parras de La Fuente developed from the deposition of calcareous cyanobacterial microspheroids that accumulated under perennial blooms during the Late Cenomanian through the Middle Turonian. Multi-proxy analyses included sedimentological, petrographical, scanning electron microscopy, stable isotope, trace element geochemistry, and paleontological data. The combined results allowed the correlation of δ13C and anomalies in Mo, V, and Cr with the abundance and predominance of calcareous cyanobacterial microspheroids, which were the main suppliers of the carbonate components and the organic matter throughout deposition of the Indidura Formation in the Parras de la Fuente area, under dysoxic/anoxic conditions. Conspicuous interbeds of dark and light-gray laminated marly calcilutites, and dark-gray marlstones that characterize the stratigraphic sequence formed in response to external forcing climatic factors of millennial-scale Milankovitch cycles (ca. 20 ka precession). At the microscopic level, the prominent dark and light-gray laminae were formed during cycles similar to the 10 to 15 years solar irradiance maximum, and represent alternating periods of high and low calcareous cyanobacterial microspheroids productivity.

Experimental characterization of wingtip vortices using smoke flow visualizations

In order to predict the axial development of the wingtip vortices strength an accurate theoretical model is required. Several experimental techniques have been used to that end, e.g. PIV or hotwire anemometry, but they imply a significant cost and effort. For this reason, we have carried out experiments using the smoke-wire technique to visualize smoke streaks in six planes perpendicular to the main stream flow direction. Using this visualization technique, we obtained quantitative information regarding the vortex velocity field by means of Batchelor's model~\cite{batchelor}, which only depends on two free parameters, i.e. the vortex strength, $S$, and the virtual origin, $z_0$. Results for two chord based Reynolds numbers have been compared with those provided by del Pino et at. (2011), finding good agreement.

On the optimaL response of q-vortex

Wingtip vortices represent a hazard for the stability of the following airplane in airport highways. These flows have been usually modeled as swirling jets/wakes, which are known to be highly unstable and susceptible to breakdown at high Reynolds numbers for certain flow conditions, but different to the ones present in real flying airplanes. A very recent study based on Direct Numerical Simulations (DNS) shows that a large variety of helical responses can be excited and amplified when a harmonic inlet forcing is imposed. In this work, the optimal response of q-vortex (both axial vorticity and axial velocity can be modeled by a Gaussian profile) is studied by considering the time-harmonically forced problem with a certain frequency ω. We first reproduce Guo and Sun’s results for the Lamb-Oseen vortex (no axial flow) to validate our numerical code. In the axisymmetric case m = 0, the system response is the largest when the input frequency is null. The axial flow has a weak influence in the response for any axial velocity intensity. We also consider helical perturbations |m| = 1. These perturbations are excited through a resonance mechanism at moderate and large wavelengths as it is shown in Figure 1. In addition, Figure 2 shows that the frequency at which the optimal gain is obtained is not a continuous function of the axial wavenumber k. At smaller wavelengths, large response is excited by steady forcing. Regarding the axial flow, the unstable response is the largest when the axial velocity intensity, 1/q, is near to zero. For perturbations with higher azimuthal wavenumbers |m| > 1, the magnitudes of the response are smaller than those for helical modes. In order to establish an alternative validation, DNS has been carried out by using a pseudospectral Fourier formulation finding a very good agreement.

Nonlinear evolution of harmonically forced perturbations on a wingtip vortex

Wingtip vortices are created by flying airplanes due to lift generation. The vortex interaction with the trailing aircraft has sparked researchers’ interest to develop an efficient technique to destroy these vortices. Different models have been used to describe the vortex dynamics and they all show that, under real flight conditions, the most unstable modes produce a very weak amplification. Another linear instability mechanism that can produce high energy gains in short times is due to the non-normality of the system. Recently, it has been shown that these non-normal perturbations also produce this energy growth when they are excited with harmonic forcing functions. In this study, we analyze numerically the nonlinear evolution of a spatially, pointwise and temporally forced perturbation, generated by a synthetic jet at a given radial distance from the vortex core. This type of perturbation is able to produce high energy gains in the perturbed base flow (10^3), and is also a suitable candidate for use in engineering applications. The flow field is solved for using fully nonlinear three-dimensional direct numerical simulation with a spectral multidomain penalty method model. Our novel results show that the nonlinear effects are able to produce locally small bursts of instability that reduce the intensity of the primary vortex.