Mobile phone addiction has become a common phenomenon among college students, which seriously affects their physical and mental health. In this process, individuals with a strong sense of loneliness tend to seek social support and belonging in the virtual network, which leads to the occurrence of mobile phone addiction. At the same time, studies have begun to explore ways to reduce mobile phone addiction by improving physical activity. The purpose of this study was to explore the impact of low-level college students' physical exercise on mobile phone addiction, and focuses on the mediating mechanism of loneliness. The mobile phone addiction scale, the physical activity level scale, and the loneliness scale were selected as the subjects. SPSS 23.0 was used to perform descriptive statistics, correlation analysis, multiple regression analysis, and bootstrap mediation effect test on the data. There were significant differences in gender dimensions between physical exercise, mobile phone addiction, and loneliness of low-level college students. Correlation analysis shows that there is a significant negative correlation between physical exercise and mobile phone addiction (r = -0.14, P < 0.01) and loneliness (r = -0.15, P < 0.01). Loneliness and mobile phone addiction (r = 0.29, P < 0.01) was significantly positively correlated. The test results of the mediating effect show that the 95% confidence interval of the indirect effect Bootstrap produced by loneliness does not contain a value of 0, indicating that loneliness has a significant mediating effect between the level of physical exercise and mobile phone addiction (standardized effect value = -0.58, Accounted for 29% of the total effect). The level of physical exercise of low-level college students is significantly negatively related to mobile phone addiction and loneliness, and loneliness is significantly positively related to mobile phone addiction. There is a mediating effect of loneliness between physical exercise and mobile phone addiction.

Regular laser-induced periodic surface structures (LIPSS) were efficiently fabricated on indium tin oxide (ITO) films by femtosecond laser direct writing with a cylindrical lens. It was found that randomly distributed nanoparticles and high spatial frequency LIPSSs (HSFL) formed on the surface after a small number of cumulative incident laser pulses per spot, and regular low spatial frequency LIPSSs (LSFL) appeared when more laser pulses accumulated. The mechanism of the transition was studied by real-time absorptance measurement and theoretical simulation. Results show that the interference between incident laser and surface plasmon polaritons (SPPs) excited by random surface scatterers facilitates the formation of prototype LSFLs, which in turn enhances light absorption and SPP excitation following laser pulses. The effects of scanning velocity and laser fluence on LSFL quality were discussed in detail. Moreover, large-area extremely regular LSFL with a diameter of 30 mm were efficiently fabricated on an ITO film by femtosecond laser direct writing with the cylindrical lens. The fabricated LSFLs on the ITO film demonstrate vivid structural color. During LSFL processing, the decrease of ITO film thickness leads to the increase of near-infrared optical transmittance.

The purpose of this study was to analyze the impact of time management disposition on mobile phone addiction, explore the mediating role of self-esteem, and examine the differences between active and inactive college students in this mediating role. 887 college students participated in this study with valid measures. According to physical activity rating scale (PARS-3), students who met the recommendations of the World Health Organization's Global recommendations on physical activity for health were categorized into active groups while the others were inactive group. The data was subjected to mediation model testing and multi-group comparison using Amos 21.0. The proportion of physical inactivity of college students was as high as 66.76%, there were significant differences between active and inactive college student in time monitoring concept, time efficacy, self-esteem, withdrawal symptoms, prominent behavior, social comfort and mood change. Each dimension of time management disposition was significantly negatively correlated with each dimension of mobile phone addiction, and was significantly positively correlated with self-esteem. Self-esteem was significantly negatively correlated with all dimensions of mobile phone addiction. According to the model test, the data fitted the hypothesized model well. In the whole sample model and active group model, self-esteem played a partial mediating role. In the inactive college student group, the exercise value cognition played a part of mediating role. Multi-group analysis found that the moderating effect of active or not was not significant. Self-esteem played a part of mediating role in the influence of time management disposition on mobile phone addiction. The findings suggest that persistent participation in physical activity help students to improve time management ability and reduce mobile phone dependence and even addiction. Future research needs to explore more influential factors for promoting college students' physical and mental health.

Increasing research attention is being paid to the factors influencing the comprehensive and healthy development of adolescents. However, few studies have specifically considered cultural contexts, including that of China. Based on public database—The China Education Panel Survey (CEPS) data, this paper takes fixed-effect model to examine the relationship between family structure and physical exercise/academic achievement of middle-school students, plus their intermediary mechanisms. The results were as follows: (1) Middle-school students in intact families displayed higher levels of physical exercise and academic achievement than those in families with one or both parents absent; (2) Family structure influenced middle-school students’ development through the two mechanisms of family socioeconomic status and parental input; and (3) Fathers and mothers fulfill different roles in middle-school students’ development: fathers contribute more to their involvement in physical exercise; mothers contribute more to their academic achievement. The results carry theoretical and practical implications for the development of adolescents, both in China and elsewhere.

Procrastination is prevalent in the study and life of the college student population. There is evidence suggesting that procrastination can have a negative impact on mood and behavior. However, in the field of exercise, the effects and mechanisms of procrastination on exercise have not been widely studied. Therefore, this study investigates the relationship between procrastination and exercise volume of college students, and discusses the mediation effect of time efficiency. The sample comprised 910 university students from 5 provinces（female: 509, male: 401）who completed inventories assessing their procrastination, time efficiency and exercise volume, and the relationships between these variables were examined using a model of mediation. In the present study, the appropriate IRB approval has been obtained from East China Normal University. There are significant differences in procrastination (t = 2.43, p < 0.05) and exercise volume (t = 7.42, p < 0.01) among college students of different genders and no difference in the sense of time efficiency. The body mass index is classified as lean (BMI < 18.5), normal (18.5 ≤ BMI ≤ 23.9), overweight (24.0 ≤ BMI ≤ 27.9) and obese (BMI ≥ 28) by standard, and there are significant differences between body mass index and exercise volume (F = 7.51, p < 0.01). Procrastination was negatively correlated with time efficiency (r = -0.525, p < 0.01) and exercise volume (r = -0.159, p < 0.01), and there was a significant positive correlation between time efficiency and exercise volume (r = 0.164, p < 0.01). Mediating effect test shows that the time efficiency has a certain intermediary effect between procrastination and exercise volume (indirect effect = -0.090, LLCI = -0.163, ULCI = -0.012). Findings provide support that procrastination affects college students' physical exercise through time efficiency. We can start with improving college students' time efficiency to promote the participation of physical activities. Future research needs more attention to overweight and obese college students.

Based on the self-determination theory process model, we explored the cor-relations between the latent constructs of psychological need satisfaction, motivational regulation, and leisure-time physical activity. College athletes (n=300) between 18 and 25 years of age completed a test battery on motivational aspects based on self-determination theory. Basic Psychological Need in Exercise Scale and Behavior Regulation in Exercise Questionnaire 2 were used to measure psychological need satisfaction and motivational regulation in exercise context. International Physical Activity Questionnaire was used to measured leisure-time physical activity in different intensity. Results show that autonomous motivation and identified regulation are mediators in the association between psychological need satisfaction

Inhibitory function is the core sub-function of executive function, which is mainly aimed at inhibiting the current dominant response in the cognitive process. It is embodied in the control of preventing the activation of irrelevant information, disturbing the irrelevant information, and the dominant reaction in the process. However, little research has examined the impact of Tai Chi on inhibitory function among native African students. The major purpose of this study was to conduct an experimental study on the inhibitory function of African college students through Tai Chi intervention, and to explore the non-Tai Chi local country students’ changes in the inhibitory function under the intervention of Tai Chi. Participants were18 male students from the University of Dar es Salaam in Tanzania, who were randomly selected from the experimental group and the control group. The experimental group was provided for an 8-week Tai Chi intervention, and the control group did not have Tai Chi program. The Inhibitory function was respectively measured by the Flanker task. A 2 x 2 repeated measures MANOVA was employed to examine the effect of exercise intervention (non-Tai Chi, Tai Chi) and time (pre-test, post-test) on the inhibition function among native African students. Before the study, an equal-pair matching design was used. The One-Way ANOVA to matching and screening the subject for exercise habits, BMI values, and age. The homogeneity of different groups' inhibition functions before the study was ensured. From the inhibition function, the time effect in the subject F=251.43, P=0.00 Conclusions: Tai Chi intervention has a positive impact on the inhibition function of male African college students.

Ultrafast laser-induced periodic surface structures (LIPSSs) have been studied intensely in the last two decades, which have become a useful method for surface nanostructures and are widely used to tune surface properties. This paper reported the fabrication of high-spatial-frequency LIPSSs (HSFLs) on FTO film induced by 1,030[Formula: see text]nm femtosecond laser. The morphology, duty cycle and birefringence effects of HSFLs were studied in detail by changing the laser fluence and scanning speed. Clear and uniform HSFLs were formed over the entire ablated area when the laser fluence and scanning speed were 89[Formula: see text]mJ/cm2 and 0.01[Formula: see text]mm/s, respectively. The duty cycle of the HSFL was measured to be as high as 0.36, and the thickness of the HSFL layer was found to be in the range of 409–546[Formula: see text]nm. The phase retardation of the FTO film with HSFLs could reach up to 96[Formula: see text]nm and could be used as an optical attenuator with a tunable range of 71–100% for 532[Formula: see text]nm linear polarized light.