BACKGROUND With the increasing global incidence of mental illness,depression has become a serious problem among college students.AIM To investigate the relationship between depression and its correlates in Chinese ado...BACKGROUND With the increasing global incidence of mental illness,depression has become a serious problem among college students.AIM To investigate the relationship between depression and its correlates in Chinese adolescents and to identify diagnostic predictors of depression,examine the effects of binge eating,physical activity,and body dissatisfaction on depression among college students and to determine a diagnostic cutoff value for depression based on body dissatisfaction.METHODS We conducted a cross-sectional survey of 1286 college students in South China.Physical activity level,depressive symptoms,and binge eating behavior were assessed using the Physical Activity Scale-3,Zung Self-Rating Depression Scale,and Dutch Eating Behavior Questionnaire,respectively.The absolute difference between actual body mass index(BMI)and ideal BMI was used to indicate the level of body dissatisfaction.Structural equation modeling(SEM)and receiver operating characteristic(ROC)curve analysis were used to examine the relationships between these variables and depression.RESULTS The findings showed that female college students reported higher levels of depression.Physical activity,body dissatisfaction,and binge eating behavior were significantly associated with depression.SEM revealed that body dissatisfaction played a mediating role.A body dissatisfaction score of 1.73 was identified as the diagnostic cutoff value for predicting depression,with an area under the ROC curve of 70.0%,providing a basis for targeted interventions.CONCLUSION This study demonstrated a significant positive correlation between body dissatisfaction and depression.Low levels of physical activity and binge eating behaviors were found to heighten the risk of depression.Therefore,promoting physical activity and healthy eating habits among adolescents is essential.Additionally,the identification of a diagnostic threshold for body dissatisfaction represents a novel finding with important implications for early screening.Future longitudinal studies are recommended to further refine this diagnostic criterion.展开更多
A new low-cost corrosion-resistant rebar（HRB400R）was designed and fabricated by Cr micro-alloying.The HRB400 Rrebar had uniform distribution of Cr element in ferrite grains.The corrosion behavior of the rebar in the...A new low-cost corrosion-resistant rebar（HRB400R）was designed and fabricated by Cr micro-alloying.The HRB400 Rrebar had uniform distribution of Cr element in ferrite grains.The corrosion behavior of the rebar in the neutral Cl^--containing environment was studied systematically,and the improved corrosion resistance of the HRB400 Rrebar was revealed.According to the corrosion-morphology observation and electrochemical monitoring during the constant immersion corrosion in the 3.5mass% NaCl solution,the HRB400 Rrebar presented alleviated corrosion damage,nobler Ecorr,lower Icorr,and larger Rtvalues,and these phenomena were more remarkable in the initial corrosion period.The elevated electrode potential of the rebar,caused by the solid-solution of Cr micro-alloying in the ferrite grains,was the key to the corrosion-resistance improvement.The HRB400 Rrebar also presented much lower mass-loss rate in the salt spray corrosion test.Besides the elevated corrosion resistance of the matrix,the doping and enrichment of Cr element in the rust layer was another factor for the higher corrosion resistance,which retarded the penetration of aggressive medium through the rust layer.展开更多
The surface nano-crystallization （SNC） of carbon steel was achieved via a high-speed rotating wire-brush- ing process. Microstructure characteristics of SNC steel were systematically studied. The SNC steel surface e...The surface nano-crystallization （SNC） of carbon steel was achieved via a high-speed rotating wire-brush- ing process. Microstructure characteristics of SNC steel were systematically studied. The SNC steel surface exhibited marked deformed plastic flows and high surface roughness. Due to the accumulated strains, a deformed gradient lay er with thickness of 40-50 μm was produced, and the grain size of the topmost zone was about 50-100 nm. X-ray photoelectron spectroscopy （XPS） analysis indicated that enhanced Fe oxides and Cr oxides were generated. Electrochemical corrosion tests, including open circuit potential （OCP）, electrochemical impendence spectroscopy （EIS）, potentiodynamic polarization （PDP） and potentiostatic polarization （PP） were conducted to study the corrosion be- havior of SNC steel in 3.5 mass% NaC1 solution, where an improved corrosion resistance was observed. The resulted improvement resulted from the dominated positive effects （the attached Cr alloying element and enhanced oxide film） against the negative effects （the higher roughness and the improved corrosion activity of surface microstructure）.展开更多
基金Supported by Starting Research Fund from the Gannan Medical University,No.QD202121。
文摘BACKGROUND With the increasing global incidence of mental illness,depression has become a serious problem among college students.AIM To investigate the relationship between depression and its correlates in Chinese adolescents and to identify diagnostic predictors of depression,examine the effects of binge eating,physical activity,and body dissatisfaction on depression among college students and to determine a diagnostic cutoff value for depression based on body dissatisfaction.METHODS We conducted a cross-sectional survey of 1286 college students in South China.Physical activity level,depressive symptoms,and binge eating behavior were assessed using the Physical Activity Scale-3,Zung Self-Rating Depression Scale,and Dutch Eating Behavior Questionnaire,respectively.The absolute difference between actual body mass index(BMI)and ideal BMI was used to indicate the level of body dissatisfaction.Structural equation modeling(SEM)and receiver operating characteristic(ROC)curve analysis were used to examine the relationships between these variables and depression.RESULTS The findings showed that female college students reported higher levels of depression.Physical activity,body dissatisfaction,and binge eating behavior were significantly associated with depression.SEM revealed that body dissatisfaction played a mediating role.A body dissatisfaction score of 1.73 was identified as the diagnostic cutoff value for predicting depression,with an area under the ROC curve of 70.0%,providing a basis for targeted interventions.CONCLUSION This study demonstrated a significant positive correlation between body dissatisfaction and depression.Low levels of physical activity and binge eating behaviors were found to heighten the risk of depression.Therefore,promoting physical activity and healthy eating habits among adolescents is essential.Additionally,the identification of a diagnostic threshold for body dissatisfaction represents a novel finding with important implications for early screening.Future longitudinal studies are recommended to further refine this diagnostic criterion.
基金Item Sponsored by National Basic Research Program of China(2015CB655100)National Natural Science Foundation of China(51308111+4 种基金51278098)Postdoctoral Science Foundation of China(2013M531249)Industry-University-Research Cooperative Innovation Fund of Jiangsu Province of China(BY2013091)Postdoctoral Science Foundation of Jiangsu Province of China(1202008C)Applied Research Foundation of Nantong City of Jiangsu Province of China(BK2013001)
文摘A new low-cost corrosion-resistant rebar（HRB400R）was designed and fabricated by Cr micro-alloying.The HRB400 Rrebar had uniform distribution of Cr element in ferrite grains.The corrosion behavior of the rebar in the neutral Cl^--containing environment was studied systematically,and the improved corrosion resistance of the HRB400 Rrebar was revealed.According to the corrosion-morphology observation and electrochemical monitoring during the constant immersion corrosion in the 3.5mass% NaCl solution,the HRB400 Rrebar presented alleviated corrosion damage,nobler Ecorr,lower Icorr,and larger Rtvalues,and these phenomena were more remarkable in the initial corrosion period.The elevated electrode potential of the rebar,caused by the solid-solution of Cr micro-alloying in the ferrite grains,was the key to the corrosion-resistance improvement.The HRB400 Rrebar also presented much lower mass-loss rate in the salt spray corrosion test.Besides the elevated corrosion resistance of the matrix,the doping and enrichment of Cr element in the rust layer was another factor for the higher corrosion resistance,which retarded the penetration of aggressive medium through the rust layer.
基金Item Sponsored by National Natural Science Foundation of China(51308111,51278098)Fundamental Research Funds for Central Universities of China(2015B18614)+6 种基金Natural Science Foundation of Jiangsu Province of China(BK20131373)Joint Innovation Fund Project of Jiangsu Province of China(BY2015002-02)Industry-University-Research Cooperative Innovation Fund of Jiangsu Province of China(BY2013091)“Six Talent Peak”Project of Jiangsu Province of China(2016-XCL-1962014-XCL-023)Research Innovation Project of College Graduates of Jiangsu Province of China(KYLX15-0483)Practice Innovation Project of College Graduates of Jiangsu Province of China(SJLX15-0224)
文摘The surface nano-crystallization （SNC） of carbon steel was achieved via a high-speed rotating wire-brush- ing process. Microstructure characteristics of SNC steel were systematically studied. The SNC steel surface exhibited marked deformed plastic flows and high surface roughness. Due to the accumulated strains, a deformed gradient lay er with thickness of 40-50 μm was produced, and the grain size of the topmost zone was about 50-100 nm. X-ray photoelectron spectroscopy （XPS） analysis indicated that enhanced Fe oxides and Cr oxides were generated. Electrochemical corrosion tests, including open circuit potential （OCP）, electrochemical impendence spectroscopy （EIS）, potentiodynamic polarization （PDP） and potentiostatic polarization （PP） were conducted to study the corrosion be- havior of SNC steel in 3.5 mass% NaC1 solution, where an improved corrosion resistance was observed. The resulted improvement resulted from the dominated positive effects （the attached Cr alloying element and enhanced oxide film） against the negative effects （the higher roughness and the improved corrosion activity of surface microstructure）.
