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Sökning: WFRF:(Kuklane Kalev)

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61.
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62.
  • Gavhed, Desirée, et al. (författare)
  • Mastarbete i kyla
  • 1999
  • Rapport (övrigt vetenskapligt/konstnärligt)
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63.
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64.
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65.
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66.
  • Geng, Quiqing, et al. (författare)
  • Tactile sensitivity of gloved hands in the cold operation
  • 1997
  • Ingår i: Applied human science : journal of physiological anthropology. - : Japan Society of Physiological Anthropology. - 1341-3473. ; 16:6, s. 229-36
  • Tidskriftsartikel (refereegranskat)abstract
    • In this study, tactile sensitivity of gloved hand in the cold operation has been investigated. The relations among physical properties of protective gloves and hand tactile sensitivity and cold protection were also analysed both objectively and subjectively. Subjects with various gloves participated in the experimental study during cold exposure at different ambient temperatures of -12 degrees C and -25 degrees C. Tactual performance was measured using an identification task with various sizes of objects over the percentage of misjudgment. Forearm, hand and finger skin temperatures were also recorded throughout. The experimental data were analysed using analysis of variance (ANOVA) model and the Tukey's multiple range test. The results obtained indicated that the tactual performance was affected both by gloves and by hands/fingers cooling. Effect of object size on the tactile discrimination was significant and the misjudgment increased when similar sizes of objects were identified, especially at -25 degrees C.
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67.
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68.
  • Ghaddar, Nesreen, et al. (författare)
  • Experimental and Theoretical Study of Ventilation and Heat Loss From Isothermally Heated Clothed Vertical Cylinder in Uniform Flow Field
  • 2010
  • Ingår i: Journal of Applied Mechanics. - : ASME International. - 0021-8936 .- 1528-9036. ; 77:3
  • Tidskriftsartikel (refereegranskat)abstract
    • The flow characteristics and heat transfer are studied in a vertical annulus of a heated cylinder surrounded by a permeable cylinder, subject to cross uniform wind with open end to the environment and in the presence of natural convection. The objective here is to develop a computationally efficient model capable of capturing the physics of the flow and heat transport to predict air renewal rates in the vertical annulus. The small quantities of air infiltrating/exfiltrating through the porous cylinder over its upstream/downstream regions do not substantially affect the external flow pattern around the clothed cylinder. The air annulus flow and heat transport model predicted the radial and vertical mass fluxes and the mass flow rate at the opening as a function of environment conditions, porous cylinder thermal properties, wind speed, and annulus geometry. Experiments were performed in a low speed wind tunnel (0.5-5 m/s), in which an isothermally heated vertical cylinder surrounded by a clothed outer cylinder was placed in uniform cross wind. The tracer gas method is used to predict total ventilation flow rates through the fabric and the opening. Good agreement was found between the model and experimental measurements of air renewal rate and predicted heat loss from the inner cylinder at steady conditions. A parametric study is performed to study the effect of wind speed and temperature difference between the wind and skin temperature on induced ventilation through the clothing and the opening. It is found that natural convection enhances ventilation of the annulus air at wind speed, less than 3 m/s, while at higher speeds, natural convection effect is negligible. As the temperature difference between external wind and inner cylinder surface increases, the vertical air temperature gradient and total upward airflow through the opening increase.
  •  
69.
  • Gudmundsson, Anders, et al. (författare)
  • Dust in Buildings - A Method for Identifying Particle Sources
  • 2005
  • Ingår i: Environmental ergonomics XI : proceedings of the 11th International Conference, 22-26 May, 2005, Ystad, Sweden - proceedings of the 11th International Conference, 22-26 May, 2005, Ystad, Sweden. - 9163170620 ; , s. 507-510
  • Konferensbidrag (refereegranskat)
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70.
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