فهرست مطالب مهندس سید محمد تقوی

In this paper, the crown formation and temporal propagation due to the oblique impact of a plane two-dimensional drop onto preexisting film in the non-Newtonian viscoelastic fluid are analyzed numerically. The finite volume method is applied to solve the governing equations and the volume of fluid technique is used to track the free surface of liquid phases. Here, the well-known Oldroyd-B model is used as the constitutive equation for the viscoelastic phase. However, the formation and temporal evolution of the crown’s shape is emphasized and the effects of elastic and surface tension forces on the crown’s dynamic are considered in detail. The results show that the increase in Weissenberg number, viscosity ratio, and Weber number leads to an increase in both the dimensionless crown height (Z*) and spread factor (S*), while impact angle has a major effect on the control of the crown’s height, on the other hand, this parameter has a negligible effect on spread factor in viscoelastic fluid. Moreover, by thickening of fluid film, the crown’s height increase, and the crown’s radius decrease. As the main finding of the present study, the fluid’s elasticity in the presence of surface tension force can enhance the rate of the crown propagation in the impact of an oblique drop onto liquid film.

The relationship between health related quality of life (HRQOL) and psychosocial factors have not been investigated among Iranian industrial workers. The present study is designed to assess these relationships among the workers from a cosmetic factories Yasuj city. This cross-sectional study was designed on 167 workers of factory. Psychosocial factors and health related quality of life were measured by the Persian versions of Job Content Questionnaire (P-JCQ) and the Persian version of World Health Organization Quality of Life-Brief (P-WHOQOL-BREF). An author-developed measure was used to assess socio-demographic, health, and work-related factors. Means (SDs) for physical health, psychological health, social relationships, and environmental domains of HRQOL were: 13.4 (2.9) 13.8 (2.7) 14.5 (3.5) and 13.1 (2.4), respectively. Hierarchical multiple linear regression analysis indicated that supervisor supports, sleep quality and working schedule factors were significant predictors of domains of HRQOL. To improve the worker’s HRQOL, intervention programs should focus on promoting social supports, sleep quality, regular exercise, no smoking and controlling hazardous work environment.