The rapid aging of the population presents great challenges in terms of China’s social security expenditure and economic growth. This paper uses the entropy method to comprehensively measure the provincial population aging index in 2008–2019 and constructs an intermediary effect model with it as the core explanatory variable. The results show that the population aging has a significant positive impact on economic growth and on the promotion of the economic growth of more developed areas; it also has a positive impact on the endowment insurance expenditure and medical and health expenditure and on the promotion of economically backward areas. Endowment spending and health spending fully mediate the relationship between population aging and economic growth.
Associations have been shown between father’s absence and menarcheal age, but most studies have focused on absence resulting from divorce, abandonment or death. Little research has been conducted to evaluate the effect on menarcheal age of paternal absence through migrant work. In a sample of 400 middle school students, this study examined the association between paternal migrant work and menarcheal age against a backdrop of extensive rural-to-urban migration in China. Data were collected through a self-reported questionnaire, including social-demographic characteristics, aspects of family relationships, information about father’s migrant work and age at menarche. After adjusting for BMI, parent marital status and perceived relationship with mother, lower self-perceived quality of father–daughter relationship (both ‘father present, relationship poor’ and ‘father absent, relationship poor’) and lower frequency of contact with the father were associated with higher odds for early menarche. These findings suggest that the assumption that father’s absence for work influences the timing of menarche needs to be examined in the context of the quality of the father–daughter relationship and paternal care, which appear to play a critical role in the timing of menarche. These findings also emphasize the importance of enhancing paternal involvement and improving father–daughter relationships in the development of appropriate reproductive strategy in daughters.
At present, there is still a lot of room for development and improvement in the research methods and research results of the formation of college students' entrepreneurship teams. This paper analyzes some influencing factors of forming a compound college students' entrepreneurship team such as students' knowledge structure, team cooperation ability and interdisciplinary communication environment. This paper models the complex behavior of building a compound entrepreneurial team for college students, and uses netlogo for simulation research. The research found that the stronger the students' professional knowledge ability, the higher the team cooperation ability, and the more opportunities for interdisciplinary communication with other students, the higher the efficiency and quality of building a compound entrepreneurship team for college students.
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