| 1. |
- Linton, Steven J., 1952-, et al.
(författare)
-
Psychological factors related to health, back pain, and dysfunction
- 1994
-
Ingår i: Journal of occupational rehabilitation. - : Springer. - 1053-0487 .- 1573-3688. ; 4:1, s. 1-10
-
Tidskriftsartikel (refereegranskat)abstract
- Psychosocial variables may be important determinants of experienced back pain as well as dysfunction. This paper reports on differences on a battery of psychosocial variables between women, from the same work place, off work because of back pain, having only back pain (not off work), and those without back pain. The groups suffering pain had similar levels of pain intensity and frequency and the covariates of age and work load were used in MANCOVA analyses. The results showed significant overall differences on the Coping Strategies Questionnaire, Handicap Index, Duke Health Profile, as well as items concerning family support and the relation of pain to work. Several variables differed between the Healthy group on the one hand and the two groups suffering pain on the other hand. However, coping strategies and perceived health produced significant differences between all three groups in univariate analyses. Unlike other studies the Work APGAR produced no significant results. These data suggest that work status is not directly related to pain intensity, but rather to an interaction between psychosocial factors and the pain experience. Future research should delineate which variables may be used in screening.
|
|
| 2. |
|
|
| 3. |
|
|
| 4. |
|
|
| 5. |
- Melin, Peter, 1964, et al.
(författare)
-
Flow boiling heat transfer and pressure drop for zeotropic mixtures in a horizontal tube
- 1994
-
Ingår i: Presented at IIR International Conference, Padua, September 21-23, 1994. ; , s. 8-
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Flow boiling heat transfer and pressure drop have been measured in a horizontal tube. The mediums used have been three mixtures of HCFC22 and HCFCI42b, two mixtures of propane and n-butane, and the pure substances HCFC22, HCFCI42b, propane and n-butane. The experimental facility was constructed to resemble a direct expansion evaporator typical for larger heat pumps. The evaporator is 5 metres long and divided into 10 half-metre sections. The results of the measurements show a large decrease in heat transfer during vaporization of mixtures, as compared to the predicted heat transfer using the thermodynamic properties of the mixtures in correlations working well for the pure constituents. The decrease for 50/50% mixtures was about 27- 32% and for 20/80% mixtures 19-24%. The measured heat transfer and pressure drop have been compared with existing correlations from literature (20 for heat transfer and 12 for pressure drop). The correlation most accurately predicting the measured data for pure substances in this paper was the correlation of Klimenko. Including the Thome-Shakir mixture boiling correction factor, the Klimenko correlation also predicted the mixture data with good agreement. For pressure drop, a number of correlations predicted the data well both for pure substances and for mixtures.
|
|
