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Objective: To investigate the effect of physical exercise on sleep quality and the mediating effect of smartphone use behavior in college students. Methods: A cross-sectional study design was adopted. An online survey of 5,075 college students was conducted using the Physical Activity Rating Scale-3, the Pittsburgh Sleep Quality Index, and the Mobile Phone Addiction Tendency Scale. Results: The sleep quality of college students was poor, and the proportion of college students with good sleep quality was 23.567%. A significant correlation existed between sleep quality and physical exercise (r = −0.159, P < 0.001) and mobile phone addiction (r = 0.355, P < 0.001). Physical exercise can predict sleep quality in college students (β = −0.011, P < 0.001). Smartphone use plays a part in mediating the process by which physical exercise affects sleep quality. Conclusion: Chinese college students have poor sleep quality. Physical exercise and smartphone use behavior are important factors affecting the sleep quality of college students. Physical exercise can directly predict the sleep quality of college students and can predict the sleep quality of college students through the mediating effect of smartphone use behavior. [ABSTRACT FROM AUTHOR]

A complex dislocation network on the curved end face of the α precipitate in a Ti-8 wt.% Fe alloy was observed using transmission electron microscopy (TEM). The Burgers vectors of these dislocations were determined by g ⋅ b contrast analysis, and the planes of the dislocation loops made up of the dislocations were calculated according to a series of TEM images. The interfacial structure was well interpreted by a generalized O-element approach. The determination of the planes of the dislocation loops on the end face implies that the dislocation loops lie in irrational planes rather than slip planes. These experimental results provide useful data for further study of migration of the interface. [ABSTRACT FROM AUTHOR]