Courbe d'hystérésis magnétique d'un élastomère magnétorhéologique

Ce travail présente une approche pour déterminer la courbe d'hystérésis magnétique pour les élastomères magnétorhéologiques (MRE). Les MREs pourront être appliqués, dans un futur proche, dans beaucoup de domaines différents. Les expériences ont été conduites sur un banc d'essai capable de générer un fort champ magnétique qui se trouve à l'?Institute of Aviation? de Varsovie. Les résultats acquis sur ce banc d'essai ont permis d'obtenir la courbe d'hystérésis magnétique du MRE

Comportement du fluide magnéto-rhéologique – application du modèle viscoplastique de Bodner-Partom

Pour décrire le comportement du fluide magnéto-rhéologique employé dans certains amortisseurs, on applique la loi viscoplastique de Boder-Partom, utilisée pour les métaux. La loi constitutive exprime la vitesse de déformation en fonction des contraintes de cisaillement pour une intensité de courant donnée. Les paramètres du modèle ont été déterminés pour l'amortisseur Lord RD 1005-3. Les résultats numériques de modélisation ont été confirmés par ceux obtenus lors de l'expérimentation

Sexual activity in a large representative cohort of polish men: Frequency, number of partners, correlates, and quality of life.

IntroductionSexual activity of men has been evaluated at the population-level in different regions of the world. However, reliable data are lacking for Eastern Europe. Therefore, the aim of this study was to analyze the frequency of sexual activity and the number of sexual partners in a large representative cohort of Polish men.MethodsWe performed a cross-sectional investigation with computer-assisted web interviews. Participants were stratified by age (≥18 years) and place of residence. The most recent population census was used to produce a population-representative sample of respondents. Men's sexual activity was then correlated with multiple variables.ResultsWe enrolled 3001 men, representative for age and place of residence, including adequate proportions of respondents from urban and rural areas. Most Polish men were sexually active, predominantly having had sex at least weekly with one partner. Almost 18% of respondents declined sexual intercourse and/or sexual partner in the prior year. The highest sexual activity was observed for men 35-44-years-old (for sex frequency) and 18-24-years-old (for partner number), living in medium-sized cities, employed, and married (for sex frequency) or divorced (for partner number). Erectile dysfunction negatively affected the frequency of sexual activity and lowered the number of sexual partners, although premature ejaculation did not have any effect. Frequency of sexual activity and number of sexual partners correlated well with psychological distress, quality of sex life, and overall life quality. Whereas lifestyle habits including smoking and alcohol intake decreased the likelihood of sexual activity, all analyzed comorbidities did not affect sex life.ConclusionsThis study of men's sexual activity was the first population-representative and nationwide investigation performed in Poland. Most Polish men were sexually active and sexual activity correlated with multiple variables including sociodemographic factors, erectile functioning, mental distress, overall and sex-specific quality of life, and lifestyle habits

Frequency of sexual activity and number of sexual partners based on marital status.

Frequency of sexual activity and number of sexual partners based on marital status.</p

Correlations between frequency of sexual activity/number of sexual partners and overall/sex-specific quality of life.

Correlations between frequency of sexual activity/number of sexual partners and overall/sex-specific quality of life.</p

The multivariable logistic regression analysis for frequency of sexual activity.

The multivariable logistic regression analysis for frequency of sexual activity.</p

Treatment seeking for problems with sex life.

IntroductionSexual activity of men has been evaluated at the population-level in different regions of the world. However, reliable data are lacking for Eastern Europe. Therefore, the aim of this study was to analyze the frequency of sexual activity and the number of sexual partners in a large representative cohort of Polish men.MethodsWe performed a cross-sectional investigation with computer-assisted web interviews. Participants were stratified by age (≥18 years) and place of residence. The most recent population census was used to produce a population-representative sample of respondents. Men’s sexual activity was then correlated with multiple variables.ResultsWe enrolled 3001 men, representative for age and place of residence, including adequate proportions of respondents from urban and rural areas. Most Polish men were sexually active, predominantly having had sex at least weekly with one partner. Almost 18% of respondents declined sexual intercourse and/or sexual partner in the prior year. The highest sexual activity was observed for men 35-44-years-old (for sex frequency) and 18-24-years-old (for partner number), living in medium-sized cities, employed, and married (for sex frequency) or divorced (for partner number). Erectile dysfunction negatively affected the frequency of sexual activity and lowered the number of sexual partners, although premature ejaculation did not have any effect. Frequency of sexual activity and number of sexual partners correlated well with psychological distress, quality of sex life, and overall life quality. Whereas lifestyle habits including smoking and alcohol intake decreased the likelihood of sexual activity, all analyzed comorbidities did not affect sex life.ConclusionsThis study of men’s sexual activity was the first population-representative and nationwide investigation performed in Poland. Most Polish men were sexually active and sexual activity correlated with multiple variables including sociodemographic factors, erectile functioning, mental distress, overall and sex-specific quality of life, and lifestyle habits.</div