High Resolution Viscosity Measurement by Thermal Noise Detection

An interferometric method is implemented in order to accurately assess the thermal fluctuations of a micro-cantilever sensor in liquid environments. The power spectrum density (PSD) of thermal fluctuations together with Sader's model of the cantilever allow for the indirect measurement of the liquid viscosity with good accuracy. The good quality of the deflection signal and the characteristic low noise of the instrument allow for the detection and corrections of drawbacks due to both the cantilever shape irregularities and the uncertainties on the position of the laser spot at the fluctuating end of the cantilever. Variation of viscosity below 0.03 mPa$\cdot$s was detected with the alternative to achieve measurements with a volume as low as 50 $\mu$L.Comment: Sensors, MDPI, 201

A prática de exercícios regulares desenvolvida com idosos atendidos no programa "Cabelos de Prata", na cidade de Boa Vista/Roraima /Brasil

O presente trabalho trouxe um referencial teórico sobre os exercícios regulares desenvolvidos com idosos, realizando uma análise dessa prática no Programa Cabelo de Prata, na cidade de Boa Vista, Roraima. A importância deste estudo reside em compreender melhor a necessidade da participação dos idosos em programas sociais e de atividade Física que beneficiem sua qualidade de vida. O enquadramento teórico objetivou compreender o histórico dos exercícios regulares como fontes de saúde para o corpo; identificar fatores que influenciam na prática de atividades físicas; relacionar as atividades desenvolvidas e o estado de saúde dos idosos que as praticam. No desenvolvimento do estudo empírico, verificou-se que são os homens que mais participam dos exercícios físicos realizados no Programa Cabelo de Prata. As atividades físicas preferidas pelos idosos são os exercícios físicos gerais e dançar; The practice of regular exercises developed with seniors in the “Silver hairs” program, at Boa Vista/Roraima City, Brasil ABSTRACT: This study provides a theoretical framework of the regular exercises developed with the elderly, conducting an analysis of this practice in the Silver Hair Programme in the city of Boa Vista, Roraima. The importance of this study is to bring greater awareness to the readers about the need for the participation of the elderly in social programs that benefit their quality of life. Aiming to understand the history of regular exercise as sources for body health, to identify factors that influence physical activity; relate the activities and health status of the elderly who practice them. In developing the empirical study we found that men participated more in physical exercises developed in Silver Hairs Program. Physical activities preferred by the elderly are regular exercise and dance