Effect of gravity on the spreading of a droplet deposited by liquid needle deposition technique.

This study represents an experimental investigation, complemented with a mathematical model, to decipher the effect of gravity on the spreading dynamics of a water droplet. For the theoretical discussion, an overall energy balance approach is adopted to explain the droplet spreading under both microgravity (µg) and terrestrial gravity condition. Besides explaining the mechanism of the droplet spreading under microgravity condition achieved during the parabolic flight, a technique with a detailed experimental set-up has also been developed for the successful deposition of droplet. A rational understanding is formulated through experimental investigation and theoretical analysis, which allows us to distinguish the transient variation of the spreading of a droplet, between microgravity and terrestrial gravity condition. The spreading of the droplet is predicted by the non-linear overall energy balance equation, which accounts for the operating parameters in the form of non-dimensional groups like Reynolds number ([Formula: see text]), Weber number (We) and Bond number (Bo). To distinctly identify the difference in the drop spreading at terrestrial and microgravity conditions, the Bo with transient gravitational field obtained through the on-board accelerometer is considered. The obtained theoretical results are further corroborated by experimental results which are obtained from the parabolic flight.

Effect of cawthorne and cooksey exercises on balance and quality of life of 60 to 80 year- old individuals in Shiraz: A randomized clinical trial.

Background: One of the vulnerable populations of any community are the elderly, who are exposed to poor balance, falls, injuries, reduced quality of life (QoL) and independency, and early death. Considering the importance of balance in independently performing activities of daily living (ADL) and its impact on QoL, in this study, we aimed at investigating the effect of Cawthorne and Cooksey exercises (CCE) on QoL and balance of 60 to 80 year-old individuals in Shiraz, Iran. Methods: This clinical trial study was conducted on forty 80 to 60-year-old individuals of Jahandideghan retirement center in Shiraz (20 in the intervention and 20 in the control groups) in 2014. The intervention group did CCE in three 60- minute sessions a week for 2 months. The balance status of the participants was assessed with Berg balance test, and their QoL was also examined using SF36 Quality of Life Questionnaire before the intervention and at 2 months post intervention. Data were analyzed by independent t test in SPSS software Version 19. Results: The results of the study revealed that the difference was significant in the balance change scores between the 2 groups (p<0.001, effect size = 0.78). Change differences in the QoL scores were significant between the 2 groups as well (p<0.001, effect size = 0.39). Conclusion: CCT improved QoL and balance of 60 to 80 year- old Shirazians, so considering the low cost, easy implementation, and considerable impact of the exercises, CCT could be used to prevent and treat balance disorders of the elderly.