46 resultados para Muros de Contenção
em Universidade Federal do Rio Grande do Norte(UFRN)
Resumo:
This thesis concerns the problem about the pedagogue actuation in the social education into no scholars places. It search to understand the context and the social pedagogue role to his praxis and formation that enlarger the possibilities of the social educative practices into no scholars places. In this direction, we developed an investigation about the actuation of the pedagogues-educators in Natal city, in the 2007-2010 periods, into Municipal Secretary of the Labor and Social Assistance (SEMTAS). Considering that pedagogues are regularly attached in social educators profession as municipals public employees, we re the objective to evaluate their role into the social executed in the no scholars places, with the focus in the environmental dimensions of theirs work s places, pedagogical organization, institutional management and the professional formation. It privileged in this research the Specialized Reference Center of Social Assistance II (CREAS II), the Passages Houses I, II and III, the Social-Educative Measures in Open Environment Execution Program of Natal city (PENSEMA) and the Pitimbú Educational Center (CEDUC-Pitimbú). To realize this study it developed a research with qualitative nature by critic ethnography approach privileging those information collected with the social pedagogue-educators of the mentioned places. Through the methodological procedures adopted; beyond the bibliographical review we remarked the documental research, the semi-structured interview, the questionnaires-routes and the field observations. The analytical results revealed that the politics to the social education in Brazil historically came been dimensioned by the fight of social movements demanding the fundamental rights to the excluded people; that the SEMTAS politics of social education present a relative basic social protection to the excluded children and young people specially into law view; that the politics of social education in Natal city it s close of the logic of sanitarian attention about the disadvantaged groups; that the conceptual, methodological and formatives fragilities needs to the social pedagogues-educators praxis into non scholars places made difficult the operation capacity of a educative proposition anchored in a institutional action guided by the idea of emancipator education; that the SEMTAS take face several difficulties to developed a web assistance as preview in the reception proposition elaborated by the social pedagogues-educators. However in despite the tensions we remarked the value of this potentiality to the non scholar social education in her attempt to constitute herself in a legitimate space to the pedagogue professional actuation. In despite the obstacles to work and formation quotidian, across those non scholar spaces in the municipalities institutes to the social politics, it demonstrated personal sensibility and professional creativity in learning mediations and educative action to the children and younger derived from exclusion process and the social iniquities
Resumo:
A numerical study on the behavior of tied-back retaining walls in sand, using the finite element method (FEM) is presented. The analyses were performed using the software Plaxis 2D, and were focused on the development of horizontal displacements, horizontal stresses, shear forces and bending moments in the structure during the construction process. Emphasis was placed on the evaluation of wall embedment, tie-back horizontal spacing, wall thickness, and free anchor length on wall behavior. A representative soil profile of a specific region at the City of Natal, Brazil, was used in the numerical analyses. New facilities built on this region often include retaining structures of the same type studied herein. Soil behavior was modeled using the Mohr-Coulomb constitutive model, whereas the structural elements were modeled using the linear elastic model. Shear strength parameters of the soil layers were obtained from direct shear test results conducted with samples collected at the studied site. Deformation parameters were obtained from empirical correlations from SPT test results carried out on the studied site. The results of the numerical analyses revealed that the effect of wall embedment on the investigated parameters is virtually negligible. Conversely, the tie-back horizontal spacing plays an important role on the investigated parameters. The results also demonstrated that the wall thickness significantly affects the wall horizontal displacements, and the shear forces and bending moments within the retaining structure. However, wall thickness was not found to influence horizontal stresses in the structure
Resumo:
Usually masonry structures has low tension strength, hence the design to flexural efforts can results in high reinforcement ratio, specification of high unit and prism strength, structural members with larger section dimensions and modification in structural arrangement to be possible to use masonry members. The main objective of this study is to evaluate the stiffness, the efforts distribution and the effect of horizontal elements (girders) and vertical elements (counterforts) distribution on the behavior of masonry blocks retaining walls. For this purpose, numerical modeling was performed on typical retaining wall arrangements by varying the amount and placement of horizontal and vertical elements, beyond includes elements simulating the reactions of the soil supporting the foundation of the wall. The numerical modeling also include the macro modeling strategy in which the units, mortar and grout are discretized by a standard volume that represents the masonry elastic behavior. Also, numerical model results were compared with those ones of simplified models usually adopted in bending design of masonry elements. The results show horizontal displacements, principal and shear stresses distribution, and bending moments diagrams. From the analysis it was concluded that quantity and manner of distribution of the girders are both important factors to the panel flexural behavior, the inclusion of the foundation changed significantly the behavior of the wall, especially the horizontal displacements, and has been proposed a new way of considering the flanges section of the counterforts
Resumo:
In this dissertation, we analyze, in a comparative perspective, the link between the short stories: Dama da Noite‟ and O Rapaz mais triste do mundo‟, of Caio Fernando Abreu. In order to reveal, analyze and establish relevant dialogues with Queer Theory, it‟s important, above all, make a misreading guided in the discursive contextuality of postmodern literature. In order to justify and clarify the many issues that arises in the emblematic relationships of characters that are present in the text and in the cultural context, historically and socially. It also highlights the utterance comparative value identified in the works, given the peculiarities of each one of them, not being possible to classify them as `figures of language` with which the comparison can be cited as an example. In this case, they serve to inspire the ways that may lead us to a better understanding of the parallels created between a world of the binary value and adjectives suggested by society and so well portrayed in the ideas and writings of Caio Fernando Abreu
Resumo:
The physiologist H. Selye defined stress as the nonspecific response of the body to any factors that endanger homeostasis (balance of internal environment) of the individual. These factors, agents stressors, are able to activate the Hypothalamic-Pituitary-Adrenal (HPA) axis, thus resulting in the physiological responses to stress by the release of glucocorticoids that leads to psychophysiological changes, including effects on cognitive functions such as learning and memory. When this axis is acutely stimulated occurs a repertoire of behavioral and physiological changes can be adaptive to the individual. Notwithstanding, when the HPA axis is chronically stimulated, changes may favor the development of, such as anxiety disorders. Some drugs used in the clinic for the treatment of anxiety disorders these can exert effects on cognitive function, on the HPA axis and on the anxiety. In this context, the aim of our study was to investigate the effects of administration i.p. acute of diazepam (DZP, 2 mg/kg), buspirone (BUS, 3 mg/kg), mirtazapine (MIR, 10 mg/kg) and fluoxetine (FLU, 10 mg/kg) in male mice submitted to acute restraint stress, and evaluated using plus-maze discriminative avoidance task (PMDAT), which simultaneously evaluates parameters such as learning, memory and anxiety. Our results demonstrated that (1) the administration of DZP and BUS, but not FLU, promoted anxiolytic effects in animals; (2) administration mirtazapine caused sedative effect to animals; (3) in the training session, the animals treated with BUS, MIR and FLU learned the task, on the other hand DZP group showed impairment in learning; (4) in the test session, animals treated with DZP, BUS, and MIR showed deficits in relation to discrimination between the enclosed arms, aversive versus non-aversive arm, demonstrating an impairment in memory, however, animals treated with FLU showed no interference in the retrieval of this memory; (5) acute stress did not interfere in locomotor activity, anxiety, or learning on the learning task, but induced impairment in retrieval memory, and the group treated with FLU did not demonstrated this deficit of memory . These results suggest that acute administration of drugs with anxiolytic and antidepressant activity does not interfere with the learning process this aversive task, but impair its retrieval, as well as the acute restraint stress. However, the antidepressant fluoxetine was able to reverse memory deficits promoted by acute stress, which may suggest that modulation, even acutely serotonergic neurotransmission, by selectively inhibiting the reuptake of this neurotransmitter, interferes on the process of retrieval of an aversive memory
Resumo:
Place Attachment is a positive affective bond between people and environments, and its main characteristic is the desire to maintain closeness to the place of attachment. Neighborhoods, in turn, are spaces close to the dwelling, which varies according to environmental, social and cultural characteristics. Facing the contemporary scenario of diminishment of neighborhood relations and its importance to the understanding of cities social-environmental context, the present work aimed to investigate the attachment to neighborhoods at the city of Natal-RN. This study had two stages. The first stage consisted on investigating, through an experts panel, the main characteristics of attached neighborhoods, aspects that contributes to the development of these neighborhoods, the ones that difficult, as well as look for indications of neighborhoods at the city of Natal that may be identified by these elements. In the following stage I interviewed 11 residents of two indicated neighborhoods at the district of Alecrim, to better comprehend the main characteristics of this attachment and the elements of the context that enable its development. The content of the interviews, categorized and evaluated by judges, indicated that, due to the 10 participant experts, the main characteristics of attached neighborhoods encompass elements of socialization, cooperation, physical space usage, intimacy and identity. According to them, these are characteristics enabled by temporal and rootedness aspects, by spatial contact, familiarity between neighbors, and cultural inheritance. The interviews with residents showed that attachment to the studied neighborhoods is specially grounded on support and cooperation networks between neighbors, on satisfaction with the proximity of services, and on the bond to symbolic aspects and local traditions. In addition to be enabled by spatial organization, by low displacement of residents, and by the district s history, relations at these neighborhoods are fostered by an intention to establish this kind of ties, carried by cultural values
Resumo:
Retaining walls design involves factors such as plastification, loading and unloading, pre-stressing, excessive displacements and earth and water thrust. Furthermore, the interaction between the retained soil and the structure is rather complex and hard to predict. Despite the advances in numerical simulation techniques and monitoring of forces and displacements with field instrumentation, design projects are still based on classical methods, whose simplifying assumptions may overestimate structural elements of the retaining wall. This dissertation involves a three-dimensional numerical study on the behavior of a retaining wall using the finite element method (FEM). The retaining wall structure is a contiguous bored pile wall with tie-back anchors. The numerical results were compared to data obtained from field instrumentation. The influence of the position of one or two layers of anchors and the effects of the construction of a slab bounded at the top of the retaining wall was evaluated. Furthermore, this study aimed at investigating the phenomenon of arching in the soil behind the wall. Arching was evaluated by analyzing the effects of pile spacing on horizontal stresses and displacements. Parametric analysis with one layers of anchors showed that the smallest horizontal displacements of the structure were achieved for between 0.3 and 0.5 times the excavation depth. Parametric analyses with two anchor layers showed that the smallest horizontal displacements were achieve for anchors positioned in depths of 0.4H and 0.7H. The construction of a slab at the top of the retaining wall decreased the horizontal displacements by 0.14% times the excavation depth as compared to analyses without the slab. With regard to the arching , analyzes showed an optimal range of spacing between the faces of the piles between 0.4 and 0.6 times the diameter of the pile
Resumo:
O artigo apresenta os principais elementos que compõem a questão ambiental na sociedade global, através de sua relação entre economia, meio ambiente e política internacional. A primeira parte expõe o debate ambiental no contexto internacional, enfocando-o a partir dos anos 1960, período em que os problemas ambientais surgem com mais intensidade e com eles os protestos sociais nos países centrais. Os encontros sobre política ambiental internacional foram realizados com mais frequência nos anos setenta como a conferência internacional sobre meio ambiente, a primeira chancelada pela ONU em Estocolmo, 1972. Nas décadas de 1970/1980 as autoridades governamentais reconheceram a urgência na resolução da crise ambiental e passaram a traçar estratégias para a mitigação e contenção da crise. A década de 1990 é marcada pela Conferência Rio 1992, que lançou o desenvolvimento sustentável, o qual recomenda que as gerações presentes devem se reproduzir sem comprometer a capacidade de reprodução das gerações futuras. Os encaminhamentos da terceira conferência internacional sobre meio ambiente (Johanesburgo, 2002) condicionaram a questão ambiental à necessidade da formulação de leis ambientais por parte dos Estados Nacionais e instrumentos económicos de gestão ambiental. Na Rio + 20, o tema central foi a economia verde, que surge como alternativa ao desenvolvimento sustentável e se relaciona a mitigação das mudanças climáticas, produção de baixo carbono, eficiência energética, energia renovável etc. O texto se encerra explanando sobre a questão ambiental internacional na sociedade global.
Resumo:
Leachates are effluent produced by decomposition of solid waste, they have complex composition and can be highly toxic. Therefore such percolated liquid should be collected and treated properly to avoid environmental contamination of soil and of water bodies. The objective of this study was to evaluate the toxicity through ecotoxicological tests with Ceriodaphnia dubia (Cladocera - Crustacea) of percolated liquids generated in two different systems of municipal solid waste (MSW) disposal in the city of Natal/ RN: A Sanitary Landfill in the Metropolitan Region of Natal/ RN, and in a dump off area. Furthermore, it was evaluated the possible contamination of the underground water of the dump off area. Two monthly samples were taken at four points between the months of May/2009 and January/2010. The Point "A" corresponds to the end of the pond leachate treatment in ASRMN; The Point "B" corresponds to a containment pond at the dump. The Point "C" is an area near one of the cells of the dump off area where the leachate outcrops; The Point "D" stands for an underground water well at the area. The last point, called "E" was sampled only once and corresponds to the slurry produced by temporary accumulation of solid waste in the open area of the dump. The ecotoxicological tests, acute and chronic, followed the ABNT 13373/2005 rules, with some modifications. The samples were characterized by measuring the pH number, the dissolved oxygen (DO), the salinity, BOD5, COD, Cd, Cu, Pb, Cr, Fe, Mg, Ni, and Zn. At Point A, the average number of EC50-48h ranged between 1.0% and 2.77% (v/v), showing a high toxicity of the leachate to C.dubia in all months. To this point, positive correlations were found between the EC50- 48 with precipitation. Negative correlations were found between the EC50- 48h with salinity. At point B there was no response of the acute exposure of organisms to the test samples. At point C the EC50-48h ranged from 17.68% to 35.36% in just two months of the five ones analyzed, not correlated meaning. Point D, the EC50-48h level ranged between 12.31% and 71.27%, showed a negative correlation with, only, precipitation. Although it was observed toxicity of underground water in the Landfill Area, there was no evidence of water contamination by leachate, however, due to the toxic character of this water, additional tests should be conducted to confirm the quality of water that is used for human supply. At point E there was no acute toxicity. These results support the dangers of inappropriate disposal of MSW to water bodies due to the high toxicity of the leachate produced highlighting the necessity of places of safe confinement and a treatment system more effective to it
Resumo:
On Rio Grande do Norte northern coast the process of sediment transport are intensely controlled by wind and sea (waves and currents) action, causing erosion and shoreline morphological instability. Due to the importance of such coastal zone it was realized the multi-spectral mapping and physical-chemical characterization of mudflats and mangroves aiming to support the mitigating actions related to the containment of the erosive process on the oil fields of Macau and Serra installed at the study area. The multi-spectral bands of 2000 and 2008 LANDSAT 5 TM images were submitted on the several digital processing steps and RGB color compositions integrating spectral bands and Principal Components. Such processing methodology was important to the mapping of different units on surface, together with field works. It was possible to make an analogy of the spectral characteristics of wetlands with vegetations areas (mangrove), showing the possibility to make a restoration of this area, contributing with the environmental monitoring of that ecosystem. The maps of several units were integrated in GIS environment at 1:60,000 scale, including the classification of features according to the presence or absence of vegetation cover. Thus, the strategy of methodology established that there are 10.13 km2 at least of sandy-muddy and of these approximately 0.89 km2 with the possibility to be used in a reforestation of typical flora of mangrove. The physical-chemical characterization showed areas with potential to introduce local species of mangrove and they had a pH above neutral with a mean of 8.4. The characteristic particle size is sand in the fine fractions, the high levels of carbonate, organic matter and major and trace element in general are concentrated where the sediment had the less particles size, showing the high correlation that those elements have with smaller particles of sediment. The application of that methodological strategy is relevant to the better understanding of features behavior and physical-chemical data of sediment samples collected on field allow the analysis of efficiency/capability of sandy-muddy to reforestation with local mangrove species for mitigation of the erosive action and coastal processes on the areas occupied by the oil industry
Resumo:
Oil spills in marine environments represent immediate environmental impacts of large magnitude. For that reason the Environmental Sensitivity to Oil Maps constitute a major instrument for planning actions of containment and cleanup. For both the Environmental Sensitivity Maps always need to be updated, to have an appropriate scale and to represent accurately the coastal areas. In this context, this thesis presents a methodology for collecting and processing remote sensing data for the purpose of updating the territorial basis of thematic maps of Environmental Sensitivity to Oil. To ensure greater applicability of the methodology, sensors with complementary characteristics, which provide their data at a low financial cost, were selected and tested. To test the methodology, an area located on the northern coast of the Northeast of Brazil was chosen. The results showed that the products of ASTER data and image hybrid sensor PALSAR + CCD and HRC + CCD, have a great potential to be used as a source of cartographic information on projects that seek to update the Environmental Sensitivity Maps of Oil
Resumo:
The general objective of this thesis has been seasonal monitoring (quarterly time scale) of coastal and estuarine areas of a section of the Northern Coast of Rio Grande do Norte, Brazil, environmentally sensitive and with intense sediment erosion in the oil activities to underpin the implementation of projects for containment of erosion and mitigate the impacts of coastal dynamics. In order to achieve the general objective, the work was done systematically in three stages which consisted the specific objectives. The first stage was the implementation of geodetic reference infrastructure for carrying out the geodetic survey of the study area. This process included the implementation of RGLS (Northern Coast of the RN GPS Network), consisting of stations with geodetic coordinates and orthometric heights of precision; positioning of Benchmarks and evaluation of the gravimetric geoid available, for use in GPS altimetry of precision; and development of software for GPS altimetry of precision. The second stage was the development and improvement of methodologies for collection, processing, representation, integration and analysis of CoastLine (CL) and Digital Elevation Models (DEM) obtained by geodetic positioning techniques. As part of this stage have been made since, the choice of equipment and positioning methods to be used, depending on the required precision and structure implanted, and the definition of the LC indicator and of the geodesic references best suited, to coastal monitoring of precision. The third step was the seasonal geodesic monitoring of the study area. It was defined the execution times of the geodetic surveys by analyzing the pattern of sediment dynamics of the study area; the performing of surveys in order to calculate and locate areas and volumes of erosion and accretion (sandy and volumetric sedimentary balance) occurred on CL and on the beaches and islands surfaces throughout the year, and study of correlations between the measured variations (in area and volume) between each survey and the action of the coastal dynamic agents. The results allowed an integrated study of spatial and temporal interrelationships of the causes and consequences of intensive coastal processes operating in the area, especially to the measurement of variability of erosion, transport, balance and supply sedimentary over the annual cycle of construction and destruction of beaches. In the analysis of the results, it was possible to identify the causes and consequences of severe coastal erosion occurred on beaches exposed, to analyze the recovery of beaches and the accretion occurring in tidal inlets and estuaries. From the optics of seasonal variations in the CL, human interventions to erosion contention have been proposed with the aim of restoring the previous situation of the beaches in the process of erosion.
Resumo:
This study aimed to evaluate factors associated to orthodontic treatment stability and patient satisfaction in the long-term. A total of 209 patients (88 class I and 121 class II) treated with straight wire fixed appliance were selected at least 5 years post treatment. Six hundred twenty seven dental casts were examined with the PAR Index at pretreatment (T1), end of treatment (T2), and at long-term follow up (T3, mean 8.5 years post treatment). At T3, a Dental Impact on Daily Living questionnaire was used to assess patient satisfaction with the dentition in the long-term. Friedman test and multiple regression analysis were used to evaluate changes among the time points and factors associated with stability and patient satisfaction. Predictive factors used to exam the occlusion were: PAR Index at T1 and T2, age at T1, the amount of time without retainer, length of Hawley retainer wear, length of follow-up, sex, extraction and third molar status. To assess patient satisfaction were considered: changes produced by the orthodontic treatment (PAR T2-T1), post treatment stability (PAR T3), age at the start of treatment (T1), length of treatment (T2-T1), gender, and extraction. Orthodontic treatment produced a significant improvement of 94.2% in the PAR Index (T2-T1), but this change was not associated with the level of satisfaction when the patient was questioned at T3. No significant change was observed between T2 and T3. However, when the sample was divided according to the level of finalization (PAR T2), it was observed that well-finished patients experienced some deterioration (P<.001), whereas the less well-finished ones showed some improvement (P<.05). Even with the deterioration, the well-finished patients still had a better PAR Index at T3 compared to the less well-finished ones (PAR T2- T3). Regression analysis showed that PAR Index at T1 and T2, age at T1, and length of retainer wear had a slight association with occlusal stability (R2 = 0.27). Patient satisfaction was significantly associated only with PAR Index at T3 (r2=0.125, P<.0001). We can conclude that, even thought orthodontic treatment is quite stable, not so well-finished treatments tend to show some improvement and well-finished ones deteriorate some in the long-term. Despite of that, well-finished patients still have better occlusal characteristics. Patient satisfaction is not related to the result of orthodontic treatment; nevertheless, there is a slight association with dentition in the long-term
Resumo:
In order to question a sociology as it considers appropriate the body dimensions, which contributes in a mean singular in relation to body, not only as a matter, but mainly as a producer of knowledge, our research shows a reflection on corporality as the production of knowledge and to understand different perspectives and social logic here in contemporaneity, whose rationality seems to be placed in question through a performance expressed, a lot of 'breaks', including the space, which the dancer break appropriates of a reversed form and not more than linear. Our problem is the possibility of a greater understanding of this young body with dance the break, is not only 'breaking' his body, but fluent in their own body fragments, producing probably a break in relation to a dominant power established, by creating a kind of 'social resistance' to provide another sense for his life, out of the senses by the dominant of a social field. This is the area of production of knowledge, of the 'body' that cries keep our eyes, the challenge of dive in the depth of gestures, beyond the physical structure, restoring in a strong political constitution and cultural in so far as this body faces. The body as spectacular becomes 'cause and effect' of communication, this body is not only individual, it is not expression only for itself; when the young dance outside their walls individuals, makes it relational, turning to relate with the other, with the space, time and the world. The methodological point of view, to study this corporality in element break, the body as language of senses, we considered withdrawals in the field, observations of movements of the universe of break creative dance, performance and analysis of "attitudes" (expression peculiar world hip hop ), as well as my experience with dancing in the street interventions through 'urban' and our own attitudes to the object of research which challenges us academically and, it all, existentially
Resumo:
La tesis problematiza constelaciones creativas de saberes marcados por múltiples subjetividades en un espacio singular de las ciudades: la feria libre. Lugar de cambios financieros, pero también afectivos, simbólicos y míticos, ese espacio se mantiene al lado de los lugares comerciales asépticos y climatizados como son los supermercados e hipermercados de los espacios urbanos y de las metrópolis. Las ferias, por su carácter itinerante y sus personajes nómades modernos, son capaces de suscitar múltiples observaciones, divagaciones, afecciones y construcción de conocimientos. En la feria libre del barrio de Alecrim en la ciudad de Natal-RN/Brasil, principal contexto de referencia de esta investigación, en medio de tantos estímulos movilizadores de los órganos de los sentidos, salta a los ojos el elevado contingente de niños y adolescentes ejerciendo las múltiples actividades laborales. En Brasil el trabajo infantil es encajado en prohibiciones prescritas por leyes que recubren singularidades. Sin la pretensión de negar la importancia de tales convenciones y reglas, las reflexiones aquí puestas ultrapasan las amarras homogeneizantes del discurso oficial instituido de prohibición, problematizando a partir de la feria la idea de una caótica y pulsante aula al aire libre en la cual se construyen saberes más próximos de una lógica del sensible (Claude Lévi-Strauss). La feria es un laboratorio de construcción de conocimientos pertinentes (Edgar Morin), aquellos que religan fenómeno y contexto sin oponer manipulación y tiempo real de aplicabilidad de los saberes construidos. En esa escuela sin paredes, puertas, ventanas, cuadros negros o programas, los saberes de la tradición (Conceição Almeida) son probados y compartidos por niños y adolescentes que viven constantemente con un tipo de cambio de bienes y palabras en permanente construcción. En los puestos de la feria y para más allá de ellos encontramos sujetos híbridos (Bruno Latour) que se estructuran por medio de mecanismos creativos capaces de hacerlos navegar en las incertidumbres caóticas de sus vidas. Los aprendizajes de la feria fueron o son la pulsión de reinvención de esos sujetos aparentemente encarcelados en el conformismo como fatalidad última, portadores de historias embarazadas de simbologías tristes y felices que exponen la cara de un humano en permanente combustión, construcción e incertidumbre