Suchergebnisse

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) ; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) ; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) ; Introduction Impact noise is characterized by acoustic energy peaks that last less than a second, at intervals of more than 1 s. Objective To quantify the levels of impact noise to which police officers are exposed during activities at the shooting range and to evaluate the attenuation of the hearing protector. Methods Measurements were performed in the shooting range of a military police department. An SV 102 audiodosimeter (Svantek) was used to measure sound pressure levels. Two microphones were used simultaneously: one external and one insertion type; the firearm used was a 0.40 Taurus® rimless pistol. Results The values obtained with the external microphone were 146 dBC (peak), and a maximum sound level of 129.4 dBC (fast). The results obtained with the insertion microphone were 138.7 dBC (peak), and a maximum sound level of 121.6 dBC (fast). Conclusion The findings showed high levels of sound pressure in the shooting range, which exceeded the maximum recommended noise (120 dBC), even when measured through the insertion microphone. Therefore, alternatives to improve the performance of hearing protection should be considered. ; Introdução O ruído de impacto é caracterizado por apresentar picos de energia acústica de duração inferior a um segundo, em intervalos superiores a um segundo. Objetivo Quantificar os níveis de ruído de impacto a que o policial militar fica exposto durante atividades de tiro com armas de fogo e analisar a atenuação do protetor auricular utilizado. Método As medições foram realizadas no estande de tiros de um Batalhão da Polícia Militar. Para a medição dos níveis de pressão sonora foi utilizado um audiodosímetro modelo SV 102 (Svantek). Foram utilizados dois microfones simultaneamente: um externo e outro tipo inserção, e a arma utilizada foi a pistola calibre 40, da marca Taurus®. Resultados Os valores obtidos no microfone externo foram de 146 dBC (pico) e ruído máximo de 129,4 dBC (fast). Os resultados obtidos no microfone de inserção foram de 138,7 dBC (pico) e ruído máximo de 121,6 dBC (fast). Conclusão Nossos achados evidenciaram elevados níveis de pressão sonora no estande de tiros, que ultrapassaram os limites máximos recomendados (120 dBC), mesmo em medição com microfone de inserção. Portanto, alternativas para melhorar o desempenho da proteção auditiva devem ser consideradas pela equipe de segurança da corporação.

Abstract Introduction Nowadays noise remains the third largest cause of environmental pollution on Earth. It appears that despite the existing noise control legislation the issue deserves further supervision by the public authorities so that the ceilings established for the various activities are observed. People exposed to noise are more likely to develop numerous auditory and non-auditory problems directly impacting persona family and working life. Objectives The objective of this study is to research and consequently understand how the population of students of a youth and adult school in Curitiba perceives noise pollution as well as look into the actions that the school adopts in order to guide the students on the topic. Method We applied a structured questionnaire to 120 individuals and assessed the following variables: characterization of the place of residence occupation leisure health and perception of soundscapes. We also applied a closed questionnaire about educational actions for noise pollution to the school's geography teacher. Results Questionnaire responses show that people perceive noise in the most diverse environments they frequent and are able to identify the source of the noise but this perception proved fragile as themajority does not takemeasures to prevent ormitigate these noises. At school there are no actions aimed at environmental education on the subject studied. Conclusion The studied group does not perceive the noise as a harmful agent and does not prevent themselves from it and the school not work contents related to noise pollution leaving a significant gap in the awareness process of this population.

Introduction Exposure to music is the subject of many studies because it is related to an individual's professional and social activities.