【目的】评价中文版抑郁-焦虑-压力量表(depression,anxiety and stress scale,DASS-42)在肥胖青少年中的信效度。【方法】采取随机抽样的方法,选取2024年1月至9月在本院营养门诊就诊的120名肥胖青少年,采用中文版DASS-42评估肥胖青少...【目的】评价中文版抑郁-焦虑-压力量表(depression,anxiety and stress scale,DASS-42)在肥胖青少年中的信效度。【方法】采取随机抽样的方法,选取2024年1月至9月在本院营养门诊就诊的120名肥胖青少年,采用中文版DASS-42评估肥胖青少年抑郁、焦虑或压力情绪,2周后随机选取20名重新进行评估。【结果】中文版DASS-42的抑郁、焦虑、压力3个维度的Cronbach'sα系数分别为0.966、0.974、0.974,量表的重测信度为0.891。验证性因素分析:中文版DASS-42的各项拟合指数良好(χ^(2)/df=3.048,CFI=0.988,TLI=0.980,RMSEA=0.058,SRMR=0.009)。【结论】中文版DASS-42在青少年肥胖患者中具有良好的信效度,可以作为抑郁、焦虑、压力相关的评估工具。展开更多
The study aims to investigate the carbonated water erosion mechanism of lining concrete in tunnels traversing karst environment and enhance its resistance.In this study,dynamic carbonated water erosion was simulated t...The study aims to investigate the carbonated water erosion mechanism of lining concrete in tunnels traversing karst environment and enhance its resistance.In this study,dynamic carbonated water erosion was simulated to assess erosion depth,microstructure,phase migrations,and pore structure in various tunnel lining cement-based materials.Additionally,Ca^(2+)leaching was analyzed,and impact of Ca/Si molar ratio in hydration products on erosion resistance was discussed by thermodynamic calculations.The results indicate that carbonated water erosion caused rough and porous surface on specimens,with reduced portlandite and CaCO_(3) content,increased porosity,and an enlargement of pore size.The thermodynamic calculations indicate that the erosion is spontaneous,driven by physical dissolution and chemical reactions dominated by Gibbs free energy.And the erosion reactions proceed more spontaneously and extensively when Ca/Si molar ratio in hydration products was higher.Therefore,cement-based materials with higher portlandite content exhibit weaker erosion resistance.Model-building concrete,with C-S-H gel and portlandite as primary hydration products,has greater erosion susceptibility than shotcrete with ettringite as main hydration product.Moreover,adding silicon-rich mineral admixtures can enhance the erosion resistance.This research offers theory and tech insights to boost cement-based material resistance against carbonated water erosion in karst tunnel engineering.展开更多
文摘【目的】评价中文版抑郁-焦虑-压力量表(depression,anxiety and stress scale,DASS-42)在肥胖青少年中的信效度。【方法】采取随机抽样的方法,选取2024年1月至9月在本院营养门诊就诊的120名肥胖青少年,采用中文版DASS-42评估肥胖青少年抑郁、焦虑或压力情绪,2周后随机选取20名重新进行评估。【结果】中文版DASS-42的抑郁、焦虑、压力3个维度的Cronbach'sα系数分别为0.966、0.974、0.974,量表的重测信度为0.891。验证性因素分析:中文版DASS-42的各项拟合指数良好(χ^(2)/df=3.048,CFI=0.988,TLI=0.980,RMSEA=0.058,SRMR=0.009)。【结论】中文版DASS-42在青少年肥胖患者中具有良好的信效度,可以作为抑郁、焦虑、压力相关的评估工具。
基金Project(2021YJ059)supported by the Research Project of China Academy of Railway Sciences。
文摘The study aims to investigate the carbonated water erosion mechanism of lining concrete in tunnels traversing karst environment and enhance its resistance.In this study,dynamic carbonated water erosion was simulated to assess erosion depth,microstructure,phase migrations,and pore structure in various tunnel lining cement-based materials.Additionally,Ca^(2+)leaching was analyzed,and impact of Ca/Si molar ratio in hydration products on erosion resistance was discussed by thermodynamic calculations.The results indicate that carbonated water erosion caused rough and porous surface on specimens,with reduced portlandite and CaCO_(3) content,increased porosity,and an enlargement of pore size.The thermodynamic calculations indicate that the erosion is spontaneous,driven by physical dissolution and chemical reactions dominated by Gibbs free energy.And the erosion reactions proceed more spontaneously and extensively when Ca/Si molar ratio in hydration products was higher.Therefore,cement-based materials with higher portlandite content exhibit weaker erosion resistance.Model-building concrete,with C-S-H gel and portlandite as primary hydration products,has greater erosion susceptibility than shotcrete with ettringite as main hydration product.Moreover,adding silicon-rich mineral admixtures can enhance the erosion resistance.This research offers theory and tech insights to boost cement-based material resistance against carbonated water erosion in karst tunnel engineering.
