135 resultados para Ruído (Telecom)


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Pós-graduação em Educação - FFC

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Pós-graduação em Letras - FCLAS

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Odontologia Preventiva e Social - FOA

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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A exploração de maciços rochosos com uso de explosivos provoca inevitáveis impactos ambientais e desconforto para as populações do entorno, as quais estão expostas cotidianamente aos seus efeitos. Os principais efeitos ambientais se fazem sentir através do ultralançamento de fragmentos, da geração de vibrações no terreno, de sobrepressão atmosférica, da emissão de materiais particulados (poeira) na atmosfera, do aumento dos níveis de ruído, do assoreamento de áreas e/ou de drenagens adjacentes às minerações, além da alteração visual e paisagística. Esses problemas podem ser reduzidos a um nível aceitável pela comunidade afetada, se a lavra for executada de modo a preservar as condições de saúde, segurança e bem estar da população afetada, adotando-se técnicas modernas de extração e beneficiamento, e pelo monitoramento continuado dos parâmetros ambientais envolvidos, mantendo-os, no mínimo, dentro dos limites estabelecidos pelos organismos governamentais fiscalizadores.

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Numa conversação qualquer, se a intercompreensão entre emissor e receptor torna-se duvidosa, verifica-se a tentativa de restabelecerem-na a partir de metalinguagens que encontremum termo comum entre eles. A análise desses momentos de uma conversação torna possívelverificar a variação lingüística entre os interlocutores, por eles próprios destacada, de maneiramais segura e objetiva. Assim, o propósito deste trabalho é caracterizar esses momentos deperda da situação de comunicação e suas tentativas de restabelecimento, sobre um corpus colhidoem pesquisa de campo realizada pelo próprio autor.

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Pós-graduação em Ciência da Computação - IBILCE

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Pós-graduação em Engenharia Elétrica - FEIS

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The relentless pursuit for materials containing rare earth ions with photoluminescent properties has led to several studies with applications in the development of new technologies. The main focus of this work is the preparation of Er3+-doped polycrystalline Y2O3 with photoluminescent properties using PEG as an organic precursor and heat-treated at different temperatures. The methodology used in this synthesis is highly attractive due to its high feasibility for improved technology and low cost for preparing materials. The behavior of the viscous resin has been evaluated and the final compounds exhibited the formation of a cubic polycrystalline phase, which is able to support variations in Er3+ doping concentrations up to 10 mol%, without significant changes in the polycrystalline parameters. The values of the nanocrystallite size calculated by Scherrer's equation showed direct dependence on the heat-treatment temperature as well as the Er3+ concentration. Intense emission in the visible region under excitation at 980 nm was attributed to an upconversion phenomenon assigned to the intraconfigurational f-f transitions of Er3+ ions. The upconversion mechanism was investigated and it was demonstrated that the higher intense emission in the red region in comparison to the emission in the green region is related to the crystallite size. The studies about the intensity showed the dependence of upconversion emission of power source, indicating that two-photon are responsible for the green and red photoluminescence. These polycrystalline materials exhibit properties that make them promising for use in solar energy systems, C-telecom band or solid-state laser devices. (C) 2014 Elsevier B.V. All rights reserved.

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A clinical investigation was undertaken to find out the prevalence of craniomandibular signs and symptoms in a group of 11 patients with labiopalatal lesions. The number and distribution of occlusal contacts was evaluated through questionnaire, clinical examination and analysis of mounted casts in partially adjustable articulators in the position of maximum inter cuspation. The most frequent signs and symptoms were articular sounds and lateral pterygoid muscle tenderness to palpation followed by restriction of mouth opening and sensation of tiredness. The number of occlusal contacts was small, mean of 5 contacts per patient, and the site was considered as atypical, 62% of them were on inclined plane surfaces , suggesting occlusal instability. The frequency of signs and symptoms was low and they were of a mild character. The most prevailing signs of craniomandibular dysfunction - articular sounds, muscular tenderness to palpation and restriction of mouth opening - was noticed in only one of the patients

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We surveyed subjective symptoms of 600 patients referred to the Occlusion and Craniomandibular Dysfunction Center of the School of Dentistry, Campus of São José dos Campos São Paulo, Brazil. We have only considered those symptoms reported by the patients as major complaints. Our purpose on this project was to draw a profile of the disease considering sex, age and incidence of the symptoms that presented themselves or associated with others. Findings were that we found a significant larger number of women, 82.83%, comparing with 17.17% of men. Most of the patients belonged to the third decade, followed by the fourth and second. The most frequent symptom was pain on TMJ region, 42%, followed by TMJ noises, 26.6%, facial pain, 15.5%, earache, 14.5% and headache, 12.1%. The symptom TMJ noises showed to be statistically more significant in men, while headaches, pain in the neck region and temporary locking were more frequent in women. The most frequent association between two symptoms was: TMJ noises with TMJ pain, earache with headache and TMJ pain with earache. There was no statistical difference between sexes. The most frequent association of three symptoms was: TMJ noises together with TMJ pain and pain or difficulty in chewing