In order to overcome the drawback of the low degree of separation from an aqueous solution of MnO_2, Fe_3 O_4-MnO_2 core-shell nanocomposites were used as heterogeneous Fenton-like catalysts for the removal of acid or...In order to overcome the drawback of the low degree of separation from an aqueous solution of MnO_2, Fe_3 O_4-MnO_2 core-shell nanocomposites were used as heterogeneous Fenton-like catalysts for the removal of acid orange 7. On the basis of the catalyst characterization, the catalytic ability of the as-synthesized nanocomposites was examined. The results showed that Fe304-Mn02 core-shell nanocomposites had greater catalytic ability than Fe_3 O_4 or MnO_2 used alone. Meanwhile, the catalyst dosage, H_2 O_2 dosage, temperature, and initial pH had significant effects on the removal of acid orange 7. A high degree of stability and reusability were exhibited by Fe_3 O_4-MnO_2 core-shell nanocomposites. Both HO· and HO_2· were generated in the reaction and HO· was the main radical for the removal of acid orange 7. A mechanism for H_2 O_2 catalytic decomposition using Fe_3 O_4-MnO_2 core-shell nanocomposites to produce HO·is proposed.展开更多
Given the complex clinical situations and the dynamic nature of nursing, the greatest challenge for nursing educators is performing objective evaluation of students’ clinical competence. The Objective Structured Clin...Given the complex clinical situations and the dynamic nature of nursing, the greatest challenge for nursing educators is performing objective evaluation of students’ clinical competence. The Objective Structured Clinical Evaluation (OSCE) is designed to address this challenge and it has been widely used in nursing education. However, its implementation in nursing education in Taiwan has been limited. Accordingly, a quasi-experimental design was utilized to examine students’ clinical performance and stress levels using a 12-station OSCE assessment. Further, we investigated the inter-rater reliability and internal consistency of the OSCE. After controlling for scores of clinical performance, overall differences in pre- and post-practicum stress in the OSCE group were significantly higher than in the control group (F (1, 89) = 4.89, p = 0.03). There was no group effect on practicum performance after controlling for grade point average (F (1, 89) = 2.69, p = 0.14). Cronbach’s alpha for 12 OSCE stations ranged from 0.22 to 0.80 and inter-rater reliability for all 12 stations showed Pearson’s r ranging between 0.76 and 1.00. Cohen’s kappa ranged from 0.70 to 1.00展开更多
基金supported by the National Natural Science Foundation of China(Grant No.51508564)
文摘In order to overcome the drawback of the low degree of separation from an aqueous solution of MnO_2, Fe_3 O_4-MnO_2 core-shell nanocomposites were used as heterogeneous Fenton-like catalysts for the removal of acid orange 7. On the basis of the catalyst characterization, the catalytic ability of the as-synthesized nanocomposites was examined. The results showed that Fe304-Mn02 core-shell nanocomposites had greater catalytic ability than Fe_3 O_4 or MnO_2 used alone. Meanwhile, the catalyst dosage, H_2 O_2 dosage, temperature, and initial pH had significant effects on the removal of acid orange 7. A high degree of stability and reusability were exhibited by Fe_3 O_4-MnO_2 core-shell nanocomposites. Both HO· and HO_2· were generated in the reaction and HO· was the main radical for the removal of acid orange 7. A mechanism for H_2 O_2 catalytic decomposition using Fe_3 O_4-MnO_2 core-shell nanocomposites to produce HO·is proposed.
文摘Given the complex clinical situations and the dynamic nature of nursing, the greatest challenge for nursing educators is performing objective evaluation of students’ clinical competence. The Objective Structured Clinical Evaluation (OSCE) is designed to address this challenge and it has been widely used in nursing education. However, its implementation in nursing education in Taiwan has been limited. Accordingly, a quasi-experimental design was utilized to examine students’ clinical performance and stress levels using a 12-station OSCE assessment. Further, we investigated the inter-rater reliability and internal consistency of the OSCE. After controlling for scores of clinical performance, overall differences in pre- and post-practicum stress in the OSCE group were significantly higher than in the control group (F (1, 89) = 4.89, p = 0.03). There was no group effect on practicum performance after controlling for grade point average (F (1, 89) = 2.69, p = 0.14). Cronbach’s alpha for 12 OSCE stations ranged from 0.22 to 0.80 and inter-rater reliability for all 12 stations showed Pearson’s r ranging between 0.76 and 1.00. Cohen’s kappa ranged from 0.70 to 1.00
