Objective:The study aims to understand the level of perceived stress and related influencing factors among the urban and rural senior high school students in China and their channels of coping with the stress,when the...Objective:The study aims to understand the level of perceived stress and related influencing factors among the urban and rural senior high school students in China and their channels of coping with the stress,when they shifted from home-based online learning to on-campus learning after their return to school during the post-Coronavirus disease 2019(COVID-19)pandemic period.Methods:From January to March 2021,the Chinese Perceived Stress Scale(SSCPs-14)and a self-designed questionnaire were used for the online survey among the senior high school students from six secondary schools(three from cities and three from counties)in three provinces of China(Shandong,Shanghai and Sichuan)who were selected by convenient sampling.Descriptive analysis,t-test,χ^(2)test and multivariate logistic regression were used to analyze the data.Results:A total of 1,462 respondents were enrolled in the study,of which 41.66%were urban students and 58.34%were rural ones.Their overall average score of CPSS-14 was 21.69±7.65.The respondents reported the following influencing factors of perceived stress,including"Change of their learning and sleep schedule(OR=1.426,95%CI:1.056~1.927,P=0.021),"Communication with their family members(OR=2.820,95%CI:1.971~4.034,P<0.001)and"The family’s financial status"(OR=1.675,95%CI:1.181~2.376,P=0.004).Their coping strategies when facing with the stress were ranked from high to low frequency as follows:"Talk to friends(34.63%)","Talk to parents(26.88%)","Seek help from teachers(14.53%)","Deal with it on my own(13.21%)","Seek help from a psychological counsellor(7.95%),"Others(1.42%)"and"Ignore the problem(1.39%)".Rural students with three and more than three coping channels(44%)were more than urban students(36%),with a statistically significant difference between the two(χ^(2)=10.878,P=0.012).A higher proportion of respondents(49.4%)with fewer coping channels reported high level of perceived stress,compared with those with multiple coping channels(33.4%).The difference between the two groups was statistically significant(χ^(2)=55.956,P<0.001).Conclusion:Senior high school students were faced with the stress brought about by the shift from the on-line learning to on-campus learning after their return to school during the post-COVID-19 pandemic period.The change of their learning and sleeping schedule,communication with family and their family’s financial status were the main influencing factors of senior high school students'stress after their return to school.Senior high school students with more coping channels had lower level of stress.Therefore,it is suggested that stress relief measures should be taken to promote the mental health of senior high school students in the post-COVID-19 pandemic period.展开更多
Open clusters are the basic building blocks that serve as a laboratory for the study of young stellar populations in the Milky Way.Variable stars in open clusters provide a unique way to accurately probe the internal ...Open clusters are the basic building blocks that serve as a laboratory for the study of young stellar populations in the Milky Way.Variable stars in open clusters provide a unique way to accurately probe the internal structure,temporal and dynamical evolutionary stages of individual stars and the host cluster.The most powerful tool for such studies is time-domain photometric observations.This paper follows the route of our previous work,concentrating on a photometric search for variable stars in NGC 884.The target cluster is the companion of NGC869,forming the well-known double cluster system that is gravitationally bound.From the observation run in 2016 November,a total of 9247 B-band CCD images and 8218Ⅴ-band CCD images were obtained.We detected a total of 15 stars with variability in visual brightness,including five Be stars,three eclipsing binaries,and seven of unknown types.Two new variable stars were discovered in this work.We also compared the variable star content of NGC 884 with its companion NGC 869.展开更多
Political instability has increased drastically in Pakistan during the last few decades.This may intensify the fear of investors and eventually affect investment decisions.Therefore,the stock market’s reaction to pol...Political instability has increased drastically in Pakistan during the last few decades.This may intensify the fear of investors and eventually affect investment decisions.Therefore,the stock market’s reaction to political stability must be explored and appropriate policy measures should be prescribed.This paper examines the effect of political stability on stock market returns and volatility using time series data from Pakistan for the period from January 02,2004,to May 31,2018.The study uses the Generalized Autoregressive Conditional Heteroskedastic(GARCH)and Exponential Generalized Autoregressive Conditional Heteroskedastic(EGARCH)models to achieve the main objectives.The findings of the GARCH and EGARCH models confirm that political stability has a positive and significant influence on both stock market returns and volatility in Pakistan.In addition,the EGARCH findings indicate that negative shock(political instability)creates more volatility in the stock market than positive shock(political stability).The results of this study reveal that financial market investors are affected more by political instability.In conclusion,this study suggests that political stability is an essential factor affecting financial market volatility,and it leads to stable financial markets.It also emphasizes that political instability needs to be resolved to achieve stable financial markets.展开更多
文摘Objective:The study aims to understand the level of perceived stress and related influencing factors among the urban and rural senior high school students in China and their channels of coping with the stress,when they shifted from home-based online learning to on-campus learning after their return to school during the post-Coronavirus disease 2019(COVID-19)pandemic period.Methods:From January to March 2021,the Chinese Perceived Stress Scale(SSCPs-14)and a self-designed questionnaire were used for the online survey among the senior high school students from six secondary schools(three from cities and three from counties)in three provinces of China(Shandong,Shanghai and Sichuan)who were selected by convenient sampling.Descriptive analysis,t-test,χ^(2)test and multivariate logistic regression were used to analyze the data.Results:A total of 1,462 respondents were enrolled in the study,of which 41.66%were urban students and 58.34%were rural ones.Their overall average score of CPSS-14 was 21.69±7.65.The respondents reported the following influencing factors of perceived stress,including"Change of their learning and sleep schedule(OR=1.426,95%CI:1.056~1.927,P=0.021),"Communication with their family members(OR=2.820,95%CI:1.971~4.034,P<0.001)and"The family’s financial status"(OR=1.675,95%CI:1.181~2.376,P=0.004).Their coping strategies when facing with the stress were ranked from high to low frequency as follows:"Talk to friends(34.63%)","Talk to parents(26.88%)","Seek help from teachers(14.53%)","Deal with it on my own(13.21%)","Seek help from a psychological counsellor(7.95%),"Others(1.42%)"and"Ignore the problem(1.39%)".Rural students with three and more than three coping channels(44%)were more than urban students(36%),with a statistically significant difference between the two(χ^(2)=10.878,P=0.012).A higher proportion of respondents(49.4%)with fewer coping channels reported high level of perceived stress,compared with those with multiple coping channels(33.4%).The difference between the two groups was statistically significant(χ^(2)=55.956,P<0.001).Conclusion:Senior high school students were faced with the stress brought about by the shift from the on-line learning to on-campus learning after their return to school during the post-COVID-19 pandemic period.The change of their learning and sleeping schedule,communication with family and their family’s financial status were the main influencing factors of senior high school students'stress after their return to school.Senior high school students with more coping channels had lower level of stress.Therefore,it is suggested that stress relief measures should be taken to promote the mental health of senior high school students in the post-COVID-19 pandemic period.
基金the National Natural Science Foundation of China(NSFC)through grants 12003022,12373035,12233009 and 12173047support from the Youth Innovation Promotion Association of the CAS(grant No.2022055)。
文摘Open clusters are the basic building blocks that serve as a laboratory for the study of young stellar populations in the Milky Way.Variable stars in open clusters provide a unique way to accurately probe the internal structure,temporal and dynamical evolutionary stages of individual stars and the host cluster.The most powerful tool for such studies is time-domain photometric observations.This paper follows the route of our previous work,concentrating on a photometric search for variable stars in NGC 884.The target cluster is the companion of NGC869,forming the well-known double cluster system that is gravitationally bound.From the observation run in 2016 November,a total of 9247 B-band CCD images and 8218Ⅴ-band CCD images were obtained.We detected a total of 15 stars with variability in visual brightness,including five Be stars,three eclipsing binaries,and seven of unknown types.Two new variable stars were discovered in this work.We also compared the variable star content of NGC 884 with its companion NGC 869.
文摘Political instability has increased drastically in Pakistan during the last few decades.This may intensify the fear of investors and eventually affect investment decisions.Therefore,the stock market’s reaction to political stability must be explored and appropriate policy measures should be prescribed.This paper examines the effect of political stability on stock market returns and volatility using time series data from Pakistan for the period from January 02,2004,to May 31,2018.The study uses the Generalized Autoregressive Conditional Heteroskedastic(GARCH)and Exponential Generalized Autoregressive Conditional Heteroskedastic(EGARCH)models to achieve the main objectives.The findings of the GARCH and EGARCH models confirm that political stability has a positive and significant influence on both stock market returns and volatility in Pakistan.In addition,the EGARCH findings indicate that negative shock(political instability)creates more volatility in the stock market than positive shock(political stability).The results of this study reveal that financial market investors are affected more by political instability.In conclusion,this study suggests that political stability is an essential factor affecting financial market volatility,and it leads to stable financial markets.It also emphasizes that political instability needs to be resolved to achieve stable financial markets.
