1000 resultados para Geometria - Fundamentos
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Frequency Selective surfaces are increasingly common structures in telecommunication systems due to their geometric and electromagnetic advantages. As a matter of fact, the frequency selective surfaces with fractal geometry type would allow an even bigger reduction of the electrical length which provided greater flexibility in the design of these structures. In this work, we investigated the use of multifractal geometry in frequency selective surfaces. Three structures with different multifractal geometries have been proposed and analyzed. The first structure allowed the design of multiband structures with greater flexibility in controlling the resonant frequencies and bandwidth. The second structure provided a bandwidth increase even with the rising of the fractal level. The third structure showed response with angle stability, dual polarization and provided room for a bandwidth increase with the rising of the structural multifractality. Furthermore, the proposed structures increased the degree of freedom in the multiband designs because they have multiple resonant frequencies ratios between adjacent bands and are easy to deploy. The validation of the proposed structures was initially verified through simulations in Ansoft Designer software and then the structures were constructed and the experimental results obtained
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The present work aims to show a possible relationship between the use of the History of Mathematics and Information and Communication Technologies (TIC) in teaching Mathematics through activities that use geometric constructions of the “Geometry of the Compass” (1797) by Lorenzo Mascheroni (1750-1800). For this, it was performed a qualitative research characterized by an historical exploration of bibliographical character followed by an empirical intervention based on use of the History of Mathematics combined with TIC through Mathematical Investigation. Thus, studies were performed in papers dealing with the topic, as well as a survey to highlight problems and /or episodes of the history of mathematics that can be solved with the help of TIC, allowing the production of a notebook of activities addressing the resolution of historical problems in a computer environment. In this search, we came across the problems of geometry that are presented by Mascheroni stated previously in the work that we propose solutions and investigations using GeoGebra software. The research resulted in the elaboration of an educational product, a notebook of activities, which was structure to allow during its implementation, students can conduct historical and/or Mathematics research, therefore, we present the procedures for realization of each construction, followed at some moments by original solution of the work. At the same time, we encourage students to investigate/reflect its construction (GeoGebra), in addition to making comparisons with the solution Mascheroni. This notebook was applied to two classes of the course of Didactics of Mathematics I (MAT0367) Course in Mathematics UFRN in 2014. Knowing the existence of some unfavorable arguments regarding the use of history of mathematics, such as loss of time, it was found that this factor can be mitigated with the aid of computational resource, because we can make checks using only the dynamism of and software without repeating the construction. It is noteworthy that the minimized time does not mean loss of reflection or maturation of ideas, when we adopted the process of historical and/or Mathematics Investigation
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Childhood and adolescence care has frequently caused theoretical and methodological discussions. At national level, the way of dealing with this public has always been on the agenda, either by maintaining a paternalistic treatment, or by coercive and repressive expression with which this public is treated. Given the above, this research presents a thorough study of social policies focused on children and adolescents in Brazil, with the overall purpose of investigating how this process of implementation of public policies for poor children and adolescents in the state of Rio Grande do Norte was. In previous studies, it was identified that there are no official records regarding the policy implementation process for this population in the state of Rio Grande do Norte. A retrospective study about the care towards children and adolescents in Brazil was held. It ranged from the XXVIII century, through the period of assistance, until the historical period in which the child started to be considered from the perspective of a policy. Thus, a certain period was framed, so that, through the historical research method, this study could focus on gathering data about the attention focused on childhood and adolescence in the state of Rio Grande do Norte, between the years 1964 and 1988. Data was listed from newspaper files that circulated in the state during period mentioned above. This time framing corresponds to the regency of the National Policy of Child Welfare. In the state of Rio Grande do Norte, the implementation of institutions such as FUNBERN and then FEBEM did not differ from the national standard, since many projects and care programs for poor children and teenagers were executed in this period. The implementation of these institutions revealed the concern of the state in solving the problem of “minors” regarding to situations of abandonment or "delinquency" which they were involved with. However, the kind of protection provided by the state toward this population was based on the current ideology that supported the political system at the time: the military dictatorship. Thus, the main way to provide care to this population was through its institutionalization, through taking children to daycare centres and adolescents to “reeducational” institutes for “minors”.
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This dissertation is a research based on the Meaningful Learning Theory, with students from the second year of High School, in the city named Capinzal do Norte, state of Maranhão. The pedagogic approach of this research focuses on what to do and how to do so students can better grasp knowledge inherent to the Euclidean Special Geometry in a more meaningful and changing way, also that information may be kept longer in their brain, so it can last longer in the present and future. The methodological strategy adopted was the research-action, followed by the constant observance of a researcher on the matter with the purpose to ensure consistent results, which come from the use of a variety of data collector instruments, such as: Concept Maps, manipulatives, educational softwares and application of evaluative tests, besides the observations made throughout the process of investigation and the diagnosis itself. It is all due to the fact that we rely on the premise that knowledge is assimilated in particular and idiosyncratic ways, which means each and every student learns in different ways and in different periods of time. That is why it is so important to develop diversified methodologies to the same subject. This research adds to the other ones related to the theoretical frameworks of the Meaningful Learning Theory, of Concept Maps, of the use of technology on the educational process and of manipulatives, which purpose is to connect their common dots. This pedagogical intervention also focuses on the construction of the educational orientations with applicability directly on class, directed specially by the Mathematics teacher of the basic education, who might use them during your teaching practice. Such guidelines established here as an educational product aim to follow the Theory's assumptions that serves as basis to this research, thus becoming an educational element with a relevant significance. The results, with which we are faced, proved overwhelming to the proposed objectives in terms of learning, which were evident in the construction of Conceptual Maps, as well as in the use of Concrete Materials, in addition to serving as a motivational element to participating students of research. The results obtained are indeed reliable in terms of learning, considered the expected goals, and made us certain that the way we have approached the subject is consistent with a holistic education and that at the same time values the tiniest details, which are fundamental to all the learning-teaching process.
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CHAPTER 1 - This study histologically evaluated two implant designs: a classic thread design versus another specifically designed for healing chamber formation placed with two drilling protocols. Forty dental implants (4.1 mm diameter) with two different macrogeometries were inserted in the tibia of 10 Beagle dogs, and maximum insertion torque was recorded. Drilling techniques were: until 3.75 mm (regular-group); and until 4.0 mm diameter (overdrillinggroup) for both implant designs. At 2 and 4 weeks, samples were retrieved and processed for histomorphometric analysis. For torque and BIC (bone-to-implant contact) and BAFO (bone area fraction occupied), a general-linear model was employed including instrumentation technique and time in vivo as independent. The insertion torque recorded for each implant design and drilling group significantly decreased as a function of increasing drilling diameter for both implant designs (p<0.001). No significant differences were detected between implant designs for each drilling technique (p>0.18). A significant increase in BIC was observed from 2 to 4 weeks for both implants placed with the overdrilling technique (p<0.03) only, but not for those placed in the 3.75 mm drilling sites (p>0.32). Despite the differences between implant designs and drilling technique an intramembranous-like healing mode with newly formed woven bone prevailed. CHAPTER 2 - The objective of this preliminary histologic study was to determine whether the alteration of drilling protocols (oversized, intermediate, undersized drilling) present different biologic responses at early healing periods of 2 weeks in vivo in a beagle dog model. Ten beagle dogs were acquired and subjected to surgeries in the tibia 2 weeks before euthanasia. During surgery, 3 implants, 4 mm in diameter by 10 mm in length, were placed in bone sites drilled to 3.5 mm, 3.75 mm, and 4.0 mm in final diameter. The insertion and removal torque was recorded for all samples. Statistical significance was set to 95% level of confidence and the number of dogs was considered as the statistical unit for all comparisons. For the torque and BIC and BAFO, a general linear model was employed including instrumentation technique and time in vivo as independent. Overall, the insertion torque increased as a function of drilling diameter from 4.0 mm, to 3.75 mm, to 3.5 mm, with a significant difference in torque levels between all groups (p<0.001). Statistical assessment of BIC and BAFO showed significantly higher values for the 3.75 mm (recommended) drilling group was observed relative to the other two groups (p<0.001). Different drilling dimensions resulted in variations in insertion torque values (primary stability) and different pattern of healing and interfacial remodeling was observed for the different groups. CHAPTER 3 - The present study evaluated the effect of different drilling dimensions (undersized, regular, and oversized) in the insertion and removal torques of dental implants in a beagle dog model. Six beagle dogs were acquired and subjected to bilateral surgeries in the radii 1 and 3 weeks before euthanasia. During surgery, 3 implants, 4 mm in diameter by 10 mm in length, were placed in bone sites drilled to 3.2 mm, 3.5 mm, and 3.8 mm in final diameter. The insertion and removal torque was recorded for all samples. Statistical analysis was performed by paired t tests for repeated measures and by t tests assuming unequal variances (all at the 95% level of significance). Overall, the insertion torque and removal torque levels obtained were inversely proportional to the drilling dimension, with a significant difference detected between the 3.2 mm and 3.5 mm relative to the 3.8 mm groups (P < 0.03). Although insertion torque–removal torque paired observations was statis- tically maintained for the 3.5 mm and 3.8 mm groups, a significant decrease in removal torque values relative to insertion torque levels was observed for the 3.2 mm group. A different pattern of healing and interfacial remodeling was observed for the different groups. Different drilling dimensions resulted in variations in insertion torque values (primary stability) and stability maintenance over the first weeks of bone healing.
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En esta tesis se investiga El juego del cadáver exquisito, un juego surrealista cuya iconografía se caracteriza por ser de índole disparatada, incluso extravagante, cercana al relato delirante; esta tesis plantea la equiparación entre la iconografía de este juego y la derivada de procesos irracionales. En esta tesis se estudia el proceso compositivo del juego, proceso en el cual los participantes contribuyen con sus aportaciones plásticas sin que ninguno de ellos vea la participación de los demás, es una composición a ciegas, para que ello ocurra se van tapando sucesivamente las participaciones gráficas dejando solo visibles unos rasgos en los cuales el siguiente participante puede engarzar su colaboración, por lo tanto el dibujo se mantiene en la incógnita de cuál será su composición final, el resultado compositivo se desvelará después de la última participación. Es un proceso compositivo envuelto en su propia incógnita, la participación es anónima, con lo cual la propiedad del dibujo se diluye, esto favorece la plasmación del exabrupto, la creación de una realidad inopinada, una realidad que favorecida por estas características compositivas compone al margen de la lógica, el sistema consciente y la razón. Por ejemplo en este proceso de elaboración compositiva no se da la contradicción, objetos dispares pueden conformar una imagen de índole paradójica al presentarse componiendo otro que será inusual y tendrá un significado no acorde con su composición objetiva, esto ocurre por ejemplo cuando una Fuente es el resultado de la unión entre un váter, una bomba y un tornillo que por encima tiene un chorro de agua; objetos reunidos en este proceso lúdico fuera del cual no se daría esta composición, ésta es la fórmula compositiva del cadáver exquisito. Los objetos desplazan sus significados al componer otra realidad, esa imagen visible puede tener un significado distinto al que aparece delante de nosotros. Este proceso a ciegas, anónimo y lúdico favorece la expresión irreverente, se burla la censura de material que pudiera ser tachado como desvergonzado, el juego desatiende las exigencias que pudieran coartar la libertad expresiva íntima de cada jugador...
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This paper presents a survey conducted through collaborative work, which took place in a suburb school in the city of Uberlandia-MG. The research is characterized as case study and has a qualitative approach. Had the objective to look for different strategies of teaching and learning through the use of technology in pedagogical practice. Regarding the methodology in this research, we analyzed the work with the support of blogs, whose pages were used for student records and discussions directed to the geometry content. The students who were attending the fifth (5th) year of elementary school were invited to participate in this project. However, the research subjects were only those students who accepted the invitation to participate in the study through statement signed by parents. The project was developed with 30 students in the second half of 2014 and another 30 in the first half of 2015. The physical space at school, where most of the project activities were done was at the computer lab. In the process of compiling the data, at school, the following instruments were used: field notes produced by the entire project team, photographs and footage of the activities produced in the computer lab and in classroom (recorded by the research team) questionnaires, interviews, virtual space records: the blogs. The results of this research mainly focused on the analysis of the fifth year student‟s productions records in blogs. Regarding the conclusion, the research has shown that blogs, software and differentiated dynamic studies attracted the student‟s attention, leaving them mostly instigated by the unknown. Gradually, students built their own knowledge from their mistakes and successes. The entire work process enabled the computer lab to be an environment that is used not just to solving computerized and tedious drills. The blogs production work in groups, developed in students the reading and writing of both the mother language as symbols and mathematical nomenclature. The interaction between students became noticeable throughout the project, since it provided the student‟s personal growth, respect, tolerance and mutual cooperation. In this sense, we concluded that the project greatly contributed to the students' literacy process in the mother language, mathematics and computer literacy.
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El siguiente articulo pretende reflexionar sobre la relación entre los fundamentos del basquetbol, los conceptos de juego como herramienta para su enseñanza, y la filosofía de juego como la suma de conceptos que fisonomizan un equipo, con la intención de que dicha articulación pueda formalizar algunas ideas que permitan reflexionar sobre las prácticas de enseñanza del basquetbol en categorías formativas
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Esta presentación tiene como propósito presentar y compartir un conjunto de ideas que ayuden a mejorar la enseñanza de los fundamentos técnicos del básquetbol. Por otra parte, intenta interpelar algunos conceptos teóricos que se han naturalizado en el ámbito de la enseñanza, y al mismo tiempo, desde una perspectiva más propositiva, ofrecer algunas alternativas para implementar en las prácticas de este deporte
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Reseña crítica del libro "Historia Crítica de la Literatura Argentina. Una patria literaria"
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Los poemas homéricos muestran una sociedad en transición entre dos mundos, el del oîkos y el de la pólis, que comparten valores como la centralidad de lo bélico, pero que traducen esos valores en formas de liderazgo y patrones de conducta diferentes, en función de la creciente institucionalización que anuncia el surgimiento del Estado. El conflicto entre Aquiles y Agamenón puede leerse como reflejo de esa tensión, en la que la centralidad de lo bélico adopta dos formas diferentes y antagónicas. Aquiles, el mejor de los guerreros homéricos, representa valores anclados en una sociedad poco estratificada, en la que el líder es aquel que sobresale por sus características personales y cuyo lugar debe ser ratificado constantemente. Agamenón, en cambio, expresa una lógica que aparece con las transformaciones que surgen con el tránsito hacia una sociedad más estratificada: su liderazgo sigue siendo militar, pero su preeminencia sobre los otros basileîs no se basa ya en su destreza marcial, sino en su capacidad de reclutar una mayor capacidad de guerreros. El de la Ilíada es un mundo en el cual ambas lógicas están en tensión, y cuyo conflicto, en consecuencia, no puede saldarse sin matices en favor de ninguno de ellos.
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Reseña crítica del libro "Historia Crítica de la Literatura Argentina. Una patria literaria"
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En el texto El dinamismo lingüístico en el aula intercultural. Su aplicación en talleres para docentes (en prensa),Angelita Martínez, Adriana Speranza y Guillermo Fernández brindan fundamentos conceptuales para la construcción de secuencias didácticas en el contexto de la enseñanza del español como lengua extranjera. En el capítulo "Diversidad lingüística y enseñanza de la lengua: hacia la concreción de una práctica educativa que contemple la realidad multicultural de la Ciudad de Buenos Aires y la Provincia de Buenos Aires", se refieren a la consideración de antecedentes de intervención en el marco de políticas educativas vinculadas con la educación intercultural en Argentina. Ello supone tener en cuenta el trabajo de investigaciones dedicadas a la problemática del contacto lingüístico, incluyendo el bilingüismo, en diversas situaciones que incumben al trabajo docente en las aulas. En el texto se rescata el conocimiento obtenido a través del trabajo efectuado con docentes y estudiantes. Añaden que los resultados de las investigaciones sobre la temática de las variedades del español en situaciones de contacto con otras lenguas posibilitan avanzar con respecto a la elaboración de propuestas docentes en el marco de la integración. La existencia del interculturalismo se presenta de este modo como un fenómeno que enriquece la práctica y la capacitación docente en los contextos áulicos. Cabe añadir al respecto que la realidad lingüística y cultural en la actualidad está surcada por movimientos migratorios que "impone un saber" a los profesionales de la educación, y que les suma la tarea de constituirse en lo que el sociólogo Tenti Fanfani (2006) llama "agentes culturales", a saber, responsables de acompañar los procesos de transformación que atraviesa la sociedad actual, más allá de impartir conocimientos disciplinares específicos. Es menester para este trabajo en el campo de la educación un enfoque complejo e interdisciplinario que promueva estrategias y enriquecimientos teóricos