Análisis numérico del comportamiento vibratorio del conjunto móvil de un altavoz dinámico

En este trabajo se describe el proceso llevado a cabo para analizar numéricamente mediante el método de los elementos finitos (MEF) el comportamiento vibratorio del conjunto móvil de un altavoz dinámico de bobina con doble suspensión inferior y en ausencia de la superior. El estudio se centra en el rango de baja frecuencia. El calibrado del modelo se realiza en base a medidas experimentales de la frecuencia de resonancia y desplazamiento del diafragma. Se hace énfasis en la importancia de los factores de participación asociados a la fuerza de excitación y en los cambios que se producen en estos al introducir fuerzas no equilibradas. Así mismo, el análisis proporciona datos para decidir sobre la distancia entre suspensiones, su número óptimo de pliegues y la ubicación de las trencillas, siendo estos parámetros de gran interés en el diseño de este tipo de altavoces.

Corrosão do betão armado induzida por carbonatação e pela presença de cloretos

Este trabalho centra-se na problemática da corrosão do betão armado induzida por carbonatação e pela presença de cloretos. Após uma pequena reflexão sobre a durabilidade das estruturas de betão armado e da diminuição da sua vida útil por efeitos de corrosão, é feita uma descrição mais detalhada dos principais efeitos resultantes da carbonatação e da presença de cloretos. São identificados os factores externos e internos que influenciam o aparecimento da carbonatação e da sua progressão (profundidade) e apresentados os métodos mais correntes que permitem a quantificação e previsão deste fenómeno. São também abordadas as causas e efeitos da presença de cloretos, nomeadamente no que diz respeito aos mecanismos de transporte, aos factores que influenciam a velocidade e penetração, bem como os métodos que permitem a determinar a presença de cloretos nas estruturas. De seguida são abordados aspectos relacionados com a protecção e reabilitação de estruturas afectadas pelos dois processos de degradação, nomeadamente a utilização de técnicas electroquímicas, de revestimentos, armaduras especiais e inibidores de corrosão. Por fim, é apresentado um caso de estudo envolvendo os muros de contenção situados num complexo habitacional do concelho de Câmara de Lobos, em parte afectados pelos processos abordados no trabalho, onde são apresentados alguns resultados dos ensaios laboratoriais para a quantificação da carbonatação e o teor de cloretos. O estudo realizado permitiu tirar ilações interessantes quer sobre cada um dos processos, quer sobre o efeito conjunto da carbonatação e presença cloretos, dado que a presença da carbonatação influencia directamente a penetração de cloretos e potencia os seus efeitos. Tendo em conta a morfologia da Madeira e o facto de a construção ser feita a pouca distância do mar, pretende-se que o trabalho possa servir de apoio quer à realização de novos projectos, quer à protecção/reabilitação de estrutura.

La religión cristiana, considerada en sus dogmas, moral y culto es el conjunto mas admirable y sublime de verdad y santidad : Discurso ... /

Mode of access: Internet.

Maravilla americana y conjunto de raras maravillas : observadas en la prodigiosa imagen de Nuestra Sra. de Guadalupe de México /

Originally published: Mexico City : Imprenta del Colegio de San Ildefonso, 1756.

Mudanças na relação entre estado e mercado na produção de habitação de interesse social em Parnamirim-RN

The formulation of public policies, particularly those relating to social housing – SH -, follow a dialectical process of construction, which are involved in the figures of the State and tha Market.The combination of the State and Market remains in constant tension and struggle for power, which provides beyond products (policies, programs and projects), periods of crises and disruptions that can give rise to new institutional arrangements. It is possible to verify a change in the relationship between the State and the Market in the formulation of public policies of SH financing, justified by the context of the Brazilian economy growth, especially after 2003, year that began the first Lula Federal Government , and through the international financial crisis (in 2008). Thus, the State and the Real Estate Market has been undergoing a process of redefinition of their interrelations, articulating new arrangements, new scales of action and new logics of financial valorization of urban space. This peculiarity demanded the rapid thinning of speech and the proposals in the reformulation of housing policies, with the primary result within the pre-existing Growth Acceleration Program – PAC -, the release of My House , My Life – PMCMV -, established by Law 1.977 of the year 2009. Given the above, this research has as study object the relationship between financing public policies of SH, promoted by the State, and behavior of Formal Housing Market. It is believed that the established roles for each agent in the new housing finance model introduced with the PMCMV, have been adapted according to the needs of each location to make this a workable policy. It remains to identify the nature of these adaptations, in other words, what has changed in the performance of each agent involved in this process. Knowing that private capital remains where there is more chance of profit, we tend to believe that most of the adjustments were made on scale of State action. The recommendation of easing urban legislation taken by PMCMV points to how the State has been making these changes in activity to implement the production of social housing by this program. We conclude that in the change for PMCMV, the direct relationship for construction and housing projects financing began to be made between the Caixa Econômica Federal bank and the builders. The city was liberated from the direct interlocutor role between all actors involved in the production of SH and could concentrate on negotiating with the parties, focused on the effectiveness of SH public policies proposed by PMCMV. This ability and willingness for dialogue and negotiation of municipal government (represented by their managers), undoubtedly, represents a key factor for rapprochement between State and Real Estate Market in the City of Parnamirim.

Planejamento e déficit habitacional: estudo de caso a partir do cadúnico com beneficiários do programa bolsa família na zona norte de Natal

This research aims to analyze the housing conditions and socioeconomic of beneficiaries of the Bolsa Família Program – PBF of the North side of Natal city. For that, it is necessary a survey of this region's origins and how its expansion has occurred in the context of local urban development, considering demographic evolution, in particular, from the construction of housing complex and formal and informal allotments. From the field research, consisting of a pilot in loco with some households, it became possible to start the analysis of housing conditions that culminated with a detailed study of the Single Register form of the federal Government (CadÚnico), in relation to 100% (one hundred percent) of the beneficiaries of the Bolsa Familia program (PBF) of Natal city, with qualitative and quantitative information. From this general survey, a cut was done, contemplating only beneficiaries residing in the north of the city. To better understand this reality, the survey found the Brazilian housing deficit, considering its origins, historical contexts and concepts used by the following institutions: João Pinheiro Foundation (FJP), Brazilian Institute of Geography and Statistics (IBGE), Applied Economics Research Institute (IPEA), and Local Plan Housing of Social Interested (PLHIS) and the United Nations Centre for Human Settlements (UN-HABITAT). Furthermore, were compared the various concepts of city and its respective evolution, considering the importance of planning as an instrument of public policy necessary to governmental actions and permanent policy of State. As a result, there are a detach about the deficit and housing conditions in the city of Natal, mainly North Zone, pointing out the importance of using the Unified Register of the federal government as an effective tool to measure the living conditions of Brazilian municipalities.

O processo de elaboração do plano de preservação do conjunto urbanístico de Brasília: uma representação conceitual da política de preservação urbana no DF

This research aims to provide a reflection on the preservation practices of Brasilia as Cultural Heritage in four analytical/political dimensions: conceptual, urban, political-institutional and legal. In order to do that, the preparation process for the Plan for the Preservation of Brasilia Urban Set (PPCUB) was taken as research object. This preservation plan is representative of the context which determines the relation between goals and preservation practices in the social production process of urban space. Designed by Lucio Costa in 1957, Brasilia received the Cultural Heritage title 27 years later, in 1987. It was recognized a World Heritage Site by the United Nations Educational, Scientific and Cultural (UNESCO) in the same year as it "represents a unique artistic piece of work, a masterpiece of creative genius"; and "an outstanding example of a type of construction or architectural compound that illustrates a significant stage in history" (SILVA, 2003). Brasilia’s urban conception, also recognised in the district and federal levels, gives prominence to the 'urban scales' – monumental, residential, gregarious and bucolic – as the main aspects to be preserved. Despite being an undoubted representative, Brasilia seemingly displays a contradiction. On the one hand, the essential value of the city’s urban design is acknowledged as cultural heritage at international, national and district levels. On the other hand, numerous ways of urban interventions disregard the principles of that conception. In 2012, the international Monitoring Report raised some issues which highlight the following main needs: primary need for clear definition of the urban scales’ characteristics and boundaries; definition of a legal framework that conciliates national and district laws of occupation and use of land; creation of inter-sectors executive authority with both decision-making and financial autonomy; and promotion of heritage educational programs. This report also proposes "to cancel the current process of approval conducted by PPCUB and establish a formal consultation process through a committee made up by GDF and IPHAN, which will enable the active participation of University of Brasilia, the Architects Association, ICOMOS and local organizations" (SEDHAB, 2010). Already in its drafting process, the international recommendations evidence that preserving Brasilia’s urban design conception is not among the goals to be achieved. Thus, this research highlights that the intentional nature of PPCUB’s plans does little towards realizing the current proposals.

O papel do ambiente residencial na qualidade de vida de idosos: um estudo exploratório em Cabedelo, Paraíba

Currently, the growing aging population challenges the society and public health policies, for increased longevity need to be associated with quality of life. Adequate physical and social environment are key factors for the welfare of the elderly, particularly the housing environment - this thesis understood as the home (dwelling unit) and its surroundings (close proximity). In addition, Brazilian legislation in this sector indicates the importance of the elderly remain at home and in the family. In addition, Brazilian legislation in this sector indicates the importance of the elderly remain at home and in the family. Based on this framework mortar, the thesis was starting questions: How do you live the elderly population aged 80 and over which is served by the Health Family Strategy of the Unified Health System? That social and environmental conditions of the place of residence act more directly on their quality of life? How do these people get housing conditions experienced? The research aimed to investigate how the residential environment (social and physical) influence everyday activities and quality of life of the elderly. Exploratory qualitative study highlighting the home visits, developed based on multimethod strategy. The empirical study was conducted in the city of Cabedelo-PB, Nov/2013 to Feb/2014. Participants were 36 elderly people (31 women and 5 men) aged between 80 and 99 years, little education, who live 39 years in the area (average). In the research first stage were applied questionnaires for socio-demographics and livability of the residence and the surroundings. In the second stage we used semi-structured interview and a tour accompanied in the neighborhood (with those who have accepted to do so). Throughout work it was kept a diary by the researcher and held naturalistic observations of the behavior of the elderly. Quantitative data were described using descriptive statistics, and information from the interviews were analyzed through the Collective Subject Discourse technique. Among the key ideas that emerged from them are: the representation of home, neighborhood support and related issues dyad independence / autonomy. The study showed that the elderly develop strong attachment to the place where he lives, the importance of it for your health and the desire to stay there. Thus, despite experiencing many barriers (more physical than the social), at the place where they live, they say they are satisfied, even when unfavorable conditions are evident. Concluding that as the houses are environmentally more docile, simple changes ensure autonomy, independence and mobility for the elderly. In turn, the barriers of the urban environment show it more difficult to deal with, making this space inhospitable to most survey participants, a condition that hinders your physical activities and social participation, and negatively influence their quality of life.