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AbstractWhile evidence supports the link between physical activity and subjective well-being, fewer studies have explored this influence relationship from a social stratification perspective. The study thus examines whether the impact of physical activity on subjective well-being varies across different social classes, utilizing data from the China Family Panel Studies for the period 2018 to 2020. The results of multivariate logistic regression indicate that physical activity has the most significant impact on subjective well-being in the middle social class, followed by a moderate effect in the lower class, and no discernible effect in the high social class. These findings provide a valuable direction for effectively promoting subjective well-being across different social strata through sports participation. Our study contributes meaningfully to the literature on social stratification and health disparities in the context of physical activity and well-being. [ABSTRACT FROM AUTHOR]

Development of energetic catalysts with high energy density and strong catalytic activity has become the focus and frontier of research, which is expected to improve the combustion performance and ballistic properties of solid propellants. In this work, three energetic catalysts, M(H 2 O) 4 (AFCA) 2 ·H 2 O (AFCA = 3-aminofurazan-4-carboxylic acid, M = Cu, Co, Fe), are designed and synthesized based on the coordination reaction of transition metal ions and the energetic ligand. The target products are characterized by single crystal X-ray diffraction, Fourier transform infrared spectroscopy, differential thermal analysis, optical microscopy, and scanning electron microscopy. The results reveal that Cu(H 2 O) 4 (AFCA) 2 ·H 2 O crystallizes in the monoclinic space group, D c = 1.918 g cm -3 . Co(H 2 O) 4 (AFCA) 2 ·H 2 O, and Fe(H 2 O) 4 (AFCA) 2 ·H 2 O belong to orthorhombic space groups, their density is 1.886 g cm -3 and 1.856 g cm -3 , respectively. In addition, the designed catalysts show higher catalytic activity than some reported catalysts such as Co(en)(H 2 BTI) 2 ] 2 ·en (H 3 BTI = 4,5-bis(1 H -tetrazol-5-yl)-1 H -imida-zole), Co-AzT (H 2 AzT = 5,5'-azotetrazole-1,1'-diol), and [Pb(BTF)(H 2 O) 2 ] n (BTF = 4,4'-oxybis [3,3'-(1-hydroxy-tetrazolyl)]furazan) for the thermal decomposition of ammonium perchlorate (AP). The high-temperature decomposition peak temperatures of AP/Cu(H 2 O) 4 (AFCA) 2 ·H 2 O, AP/Co(H 2 O) 4 (AFCA) 2 ·H 2 O, and AP/Fe(H 2 O) 4 (AFCA) 2 ·H 2 O are decreased by 120.3 °C, 151.8 °C and 89.5 °C compared to the case of pure AP, while the heat release of them are increased by 768.8 J g -1 , 780.5 J g -1 , 750.9 J g -1 , respectively. Moreover, the burning rates of solid propellants composed of AP/Cu(AFCA) 2 (H 2 O) 4 ·H 2 O, AP/Co(AFCA) 2 (H 2 O) 4 ·H 2 O and AP/Fe(AFCA) 2 (H 2 O) 4 ·H 2 O are increased by 2.16 mm s -1 , 2.53 mm s -1 , and 1.57 mm s -1 compared with the case of pure AP. This research shows considerable application prospects in improving the combustion and energy performance of solid propellants, it is also a reference for the design and preparation of other novel energetic catalysts., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)