Dissipation of vibration in rough contact

The relationship which links the normal vibration occurring during the sliding of rough surfaces and the nominal contact area is investigated. Two regimes are found. In the first one, the vibrational level does not depend on the contact area, while in the second one, it is propor- tional to the contact area. A theoretical model is proposed. It is based on the assumption that the vibrational level results from a competition between two processes of vibration damping, the internal damping of the material and the contact damping occurring at the interface

The Influence of Age and Sex on Genetic Associations with Adult Body Size and Shape : A Large-Scale Genome-Wide Interaction Study

Genome-wide association studies (GWAS) have identified more than 100 genetic variants contributing to BMI, a measure of body size, or waist-to-hip ratio (adjusted for BMI, WHRadjBMI), a measure of body shape. Body size and shape change as people grow older and these changes differ substantially between men and women. To systematically screen for age-and/or sex-specific effects of genetic variants on BMI and WHRadjBMI, we performed meta-analyses of 114 studies (up to 320,485 individuals of European descent) with genome-wide chip and/or Metabochip data by the Genetic Investigation of Anthropometric Traits (GIANT) Consortium. Each study tested the association of up to similar to 2.8M SNPs with BMI and WHRadjBMI in four strata (men 50y, women 50y) and summary statistics were combined in stratum-specific meta-analyses. We then screened for variants that showed age-specific effects (G x AGE), sex-specific effects (G x SEX) or age-specific effects that differed between men and women (G x AGE x SEX). For BMI, we identified 15 loci (11 previously established for main effects, four novel) that showed significant (FDR= 50y). No sex-dependent effects were identified for BMI. For WHRadjBMI, we identified 44 loci (27 previously established for main effects, 17 novel) with sex-specific effects, of which 28 showed larger effects in women than in men, five showed larger effects in men than in women, and 11 showed opposite effects between sexes. No age-dependent effects were identified for WHRadjBMI. This is the first genome-wide interaction meta-analysis to report convincing evidence of age-dependent genetic effects on BMI. In addition, we confirm the sex-specificity of genetic effects on WHRadjBMI. These results may providefurther insights into the biology that underlies weight change with age or the sexually dimorphism of body shape.Peer reviewe

A satisfação do usuário em hospital universitário User satisfaction at a university hospital

São apresentados resultados de uma pesquisa exploratória da satisfação/insatisfação de 158 pacientes que recorreram a um Hospital Universitário (HUPE) para consulta inicial. As entrevistas foram feitas por alunos do primeiro ano, como parte de projeto de inserção precoce do mesmo com a prática médica, acompanhando pacientes como observadores. Foi utilizado questionário que cobriu os vários aspectos do problema: variáveis sócio-demográficas, arte do cuidado, resolutividade da consulta médica, sugestões de melhoria dos serviços. Tanto alunos/observadores como os usuários conseguiram perceber com precisão os problemas do processo do atendimento (recepção, matrícula, consulta, enfermagem, serviço social, farmácia, exames complementares) mas houve divergência de opinião entre vários aspectos da satisfação/insatisfação entre alunos e usuários, provavelmente devido às origens sociais diferentes e expectativas diversas.<br>The results of a research project into the level of satisfaction/dissatisfaction of 158 first-time patients attending by an University hospital, Brazil, are presented. The interviews were carried out by first year medical students as part of a comprehensive project concerned with the restructuring of the Medical Curriculum. Its prime objective was to expose the students to patients/consumers as early as possible in their studies. After an introductory training program, the students asked the patients arriving at the hospital out-patient clinic for permission to observe them throughout the attendance given. A questionnaire was used which covered the various aspects of the consumers relationship with a medical institution (socio-economic variables, "art of care", outcome of the medical encounter and suggestions for improvement). Both patients and students were able to perceive the different problems that patients confront in the course of their dealings with a medical institution (reception, registration, nursing, social service and medical attention). The data showed a difference of opinion between students and patients regarding several aspects of the satisfaction/dissatisfaction items, partly because of their different social class status and parthy due to the different expectations regarding medical care