The Relationships between University Students' Physical Activity Needs, Involvement, Flow Experience and Sustainable Well-Being in the Post-Pandemic Era

As the global sustainable development agenda advances, having a healthy lifestyle has become an important part of the common pursuit. Physical activity needs and experiences are becoming increasingly diverse, yet there is a paucity of research on issues associated with university students' physical activity needs, and their perceptions of their physical activity needs and sustainable well-being are not yet fully understood. Therefore, this study combines Self-Determination Theory with the existence, relatedness, and growth (ERG) Theory of Needs to explore the mediating effects of different variables on the relationship between university students' physical activity needs and sustainable well-being. A total of 900 Chinese university students were invited through an online survey to participate in this study, and the collected data were validated with a structural equation model. According to the results of the study, it was found that the level of involvement and flow experience in university students' sports activities have a mediating effect on the relationship between needs and sustainable well-being. Therefore, educators can enhance the level of sustainable well-being by stimulating university students' physical activity needs and improving their level of involvement and participation experience.

Utilization of By-Products from Livestock: Study on the Mechanical and Thermal Properties of Biodegradable Containers Made with Pork Skin Gelatin Polymer.

This study aimed to develop a biodegradable container made of pork gelatin. Gelatin was extracted from pork skin by hot water at 80 °C, and containers were prepared by adding eggshell powder (20%) as a pore agent, and walnut powder (0.08 wt%; PEW1, 0.14 wt%; PEW2) to improve hardness. The blends were molded for each experiment and dried at 30 °C for 24 h, at 40 °C for 16 h, and at 121 °C for 16 h. The containers were analyzed with respect to morphological (SEM; scanning electron microscope), mechanical (tensile strain and stress), and thermal (DSA; differential scanning calorimetry and TGA; thermogravimetric analysis) properties, as well as biodegradability. SEM investigation showed a smoother surface for PEW1 than for PEW2. The tensile stress of PEW2 (37.86 MPa) was significantly higher than that of PEW1 (28.40 MPa), and the melting enthalpies were 137.60 J/g (PEW1) and 309.60 J/g (PEW2). TGA showed similar properties, but PEW2 contained more lignin; therefore, its decomposition temperature was higher. The PEW1 and PEW2 containers were completely biodegraded after approximately 7 and 11 weeks, respectively. Walnut shell powder increased the hardness, but slowed the biodegradation process. The applications of this biodegradable container are short-lived products such as food packaging.