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- Mofidi, M., et al.
(författare)
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Frictional behaviour of some sealing elastomers in lubricated sliding
- 2012
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Ingår i: 15th Nordic Symposium on Tribology - NordTrib 2012. - Trondheim : Department of Geography, Norwegian University of Science and Technology.
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Konferensbidrag (refereegranskat)abstract
- Frictional behaviour of four sealing elastomers, including an acrylonitrile butadienerubber (NBR), a hydrogenated acrylonitrile butadiene rubber (HNBR), an acrylate rubber(ACM) and a fluoroelastomer (FKM), sliding against a steel surface under unidirectionallubricated conditions have been studied. The lubricant used in this study was paraffinic oilwith no additive and the experiments were conducted under a block-on-ring testconfiguration. The friction coefficients of the elastomers have been measured at differentsliding velocities in boundary and fluid film lubrication regimes. In the first part of each test,the sliding velocity varied from low to high values and then, in the second part, the slidingvelocity varied from high to low values repeating the same conditions in reverse order. Theresults show that the friction coefficients at low speeds are different for the two parts whichcan be due to the oil absorption or possibly dissolution of some elastomer constituents in theoil. The NBR and the ACM were the least and the most affected elastomer by the lubricantrespectively. The friction coefficients of NBR and ACM at low speeds decreased in thesecond part of the tests (in which the interaction of oil and elastomer was for longerdurations) but the friction coefficient of HNBR and FKM increased in the second part of thetests.
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| 2. |
- Mofidi, Naser, 1964-, et al.
(författare)
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General mental health, quality of life and suicide related attitudes among kurdish people in Iran
- 2008
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Ingår i: International Journal of Social Psychiatry. - : SAGE Publications. - 0020-7640 .- 1741-2854. ; 54:5, s. 457-468
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Tidskriftsartikel (refereegranskat)abstract
- Aim: To investigate (1) general mental health, (2) quality of life and (3) suicide-related attitudes in Kurds living in Iranian Kurdistan. Methods: Cross-sectional investigation; cluster random sampling procedure; 1,000 Kurds were randomly selected from 1,000 of 68,000 households in Sannandaj City, Iran; General Health Questionnaire (GHQ-12); Questionnaire on Attitudes Towards Suicide (ATTS). Results: About 27% of the subjects had to be regarded as probably suffering from a psychological disturbance. There was no gender difference regarding the number of `cases'. These possible `cases' were younger than `non-cases'. The most `cases' occurred among the unemployed. An increasing number of experiences related to suicide and the increasing emotional closeness of those experiences was found to be related to an increased probability that the individual would be classified as a `case' according to the GHQ-12 total score. Unmarried individuals more often evaluated their overall quality of life as `moderate' or `bad' compared to married individuals. Unemployed people, self-employed people and housewives formed the groups who most often reported a `very bad' or `bad' quality of life. Conclusions: Kurdish people in Iran are in need of facilities and interventional programmes aiming to improve general mental health.
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