ABSTRACT
Objective:To explore the moderating and mediating effects of psychological capital in the associations of job monotony and depressive symptoms.Methods:A convenient sampling method was used to sample 1 473 workers from a natural gas field in southwest China in October 2018.The sociodemographic characteristics, job monotony scale, PsyCap questionnaire and center of epidemiological survey, depression scale(CES-D) were conducted.Data were analyzed by SPSS 22.0 and Process v3.2 softwares.The statistical methods included t-test, one-way ANOVA, χ2 test, partial correlation analysis, multivariate regression analysis or Bootstrap method. Results:A total of 323 workers with depressive symptoms were detected, with a detection rate of 21.9%(323/1 473). The correlation analysis results showed that job monotony (13.67±1.38) was negatively correlated with self-efficacy (25.81±4.56), hope(25.91±4.55), resilience (26.80±3.80) and optimism (24.56±3.17) ( r=-0.26, -0.38, -0.36, -0.42 respectively, all P<0.01), and positively correlated with depressive symptoms ( r=0.50, P<0.01). Self-efficacy ( r=-0.38, P<0.05), hope ( r=-0.44, P<0.05), resilience ( r=-0.43, P<0.01) and optimism ( r=-0.47, P<0.01) were negatively correlated with depressive symptoms.The multivariate regression analysis results showed that self-efficacy and optimism had moderating effects on the associations of job monotony and depressive symptoms (both P<0.05), while hope and resilience had no moderating effects on the associations of job monotony and depressive symptoms (both P>0.05). The mediating effect test results showed that self-efficacy, hope, resilience and optimism played partial mediating roles in the associations of job monotony and depressive symptoms (all P<0.01), and the mediating effects were 0.139, 0.304, 0.232 and 0.339 respectively, and the proportion of mediating effect value to total effect was 12.2%, 23.3%, 18.8% and 25.3% respectively. Conclusion:Self-efficacy and optimism have moderating and mediating effects on the associations of job monotony and depressive symptoms, while hope and resilience have only mediating effects on the relationship between job monotony and depressive symptoms.
ABSTRACT
Using Isopropyl amine (0.003 mol/L), p-methyl-phenol (0.03 mol/L) and methanol (1 mol/L) for simulating amino groups, phenol groups and hydroxyl groups in silk fibroin respectively, the reaction rate of different nucleophilic groups in silk with monochlorotriazine reactive dye was studied at various temperature and pH by high performance liquid chromatography. It was found that the overall reaction rate of dyes′ phenolysis was by far higher than that of ammonolysis and alcoholysis on the conditions of 70-95 ℃ and pH=8-10. The phenolysis overall reaction rates of C.I. reactive red 24 and C.I. reactive orange 2 were 8.5 and 12.5 times of their ammonolysis′, and 23 and 50 times of their alcoholysis′ in the term of pH 9 and 95 ℃. The phenolysis efficiencies of those two dyes were 47.4 and 96.3, the ammonolysis efficiencies were 4.6 and 6.9, and the isopropyl amine, p-methyl-phenol and methanol to simulate the silk fibroin, the reaction selectivity between the monochlorotriazine reactive dyes and nucleophilic groups in silk fibroin was investigated. It was deduced that monochlorotriazine reactive dyes are suitable for dyeing silk on the conditions of about 85 ℃ and pH=8-9, and under this condition, phenol groups are the major groups in silk dyeing with monochlorotriazine reactive dyes, amino groups are the minor groups, and the contributions of hydroxyl groups can be neglected.