Chen Jin

ObjectiveAs the coronavirus disease 2019 pandemic spread across Shanghai, China, in late February 2022 and protective measures to mitigate its impact were enacted, this study aimed to estimate how home quarantine affected the mental health of preschool children in Shanghai, China and explore the association between lifestyle factors and mental health during this special period.MethodsA cross-sectional online survey of 2,110 preschool students from Shanghai, China, was conducted during May 20–25,2022. Preschooler’ mental health and daily activities were reported by parents.ResultsThe sample involved 2,110 children with a mean age of 4.65 years [standard deviation : 0.91, range: 3–6 years]. Boys and children whose mother’s education level were college and high school had higher rate of mental health problems. Boys had significantly higher rates of peer problems and prosocial behaviors than girls. The 3-year-old group had significantly higher rates of prosocial behaviors than other groups. As compared to the Shanghai norm and the SDQ results of preschool children in Shanghai in 2019, there were a significant decrease in emotional symptoms score, as well as a significant increase in conduct problems score. Additionally, peer problems score significantly increased compared to SH2019. Decreased time spent on daily sleep was associated with the increased risk for preschoolers’ mental health problems.ConclusionThere was an increase in the frequency of emotional and behavioral problems, especially regarding conduct problems and peer problems, in preschool children during the COVID-19 home quarantine in Shanghai, China. Boys, younger preschool children and children whose mother’s education level were college and high school may be especially vulnerable to emotional and behavioral problems. It was also found that decreased time spent on sleep may aggravate preschool children’s mental health problems. It may be beneficial to differentiate and focus on conducting psychoeducation and implementing psycho-behavioral interventions to solve these issues.

© 2016 American Chemical Society.High quality WSe2 films have been grown on bilayer graphene with layer-by-layer control of thickness using molecular beam epitaxy. The combination of angle-resolved photoemission, scanning tunneling microscopy/spectroscopy, and optical absorption measurements reveal the atomic and electronic structures evolution and optical response of WSe2/BLG. We observe that a bilayer of WSe2 is a direct bandgap semiconductor, when integrated in a BLG-based heterostructure, thus shifting the direct-indirect band gap crossover to trilayer WSe2. In the monolayer limit, WSe2 shows a spin-splitting of 475 meV in the valence band at the K point, the largest value observed among all the MX2 materials. The exciton binding energy of monolayer-WSe2/BLG is found to be 0.21 eV, a value that is orders of magnitude larger than that of conventional three-dimensional semiconductors, yet small as compared to other two-dimensional transition metal dichalcogennides semiconductors. Finally, our finding regarding the overall modification of the electronic structure by an alkali metal surface electron doping opens a route to further control the electronic properties of TMDCs.

Nous analysons ici la dimension temporelle-spatiale de la « modernité compressée », concept inventé et developpé par le sociologue coréen Chang Kyung-Sup. Nous examinons les rapports entre les récits individuels et les lieux urbains typiques de deux villes d’eau, Tongli et Zhenze, situées dans le sud de la province de Jiangsu, sans négliger les dynamiques culturelle et sociale concernant le développement du tourisme et la protection du « patrimoine culturel » local. L’enchâssement, le dé-senchâssement et le ré-enchâssement des mémoires et des lieux dans ces villes d’eau nous invitent à nous réinterroger sur les modes de production des temporalités, ses différentes figures et leurs divers usages. La présente étude ouvre des pistes pour s’interroger sur les concepts de modernité et de postmodernité, en examinant les rapports des espaces urbains avec les temporalités sociales.

Eve of the founding of new China, Mao Zedong made ​​a "serious problem is to educate farmers," the thesis. Thesis of this paper's historical background, content and theoretical sources, discusses the logic of the sort and analysis, and pointed out that the farmers of this thesis is the theory of Mao Zedong's "turning point." At the eve of the founding of New China, Mao Zedong raised the important thesis "the serious problem is to educate Chinese peasants". This paper studies the thesis on the historical backgrounds, contents, theoretical sources and narrative logic, and points out that the thesis was the turning point of Mao Zedong's theory of peasantry

Commemoration is a political ritual, but also a political symbol, has its own unique political function. Period of democratic revolution, Mao Zedong through a variety of ways and means to make the political function of commemoration to be fully expressed and released. Specific performance: With the commemoration of the basic principles of Marxism and the interpretation of Chinese Marxism, a theory of interpretation of the commemoration of an important carrier; with celebrations to make their own political views, to express their political aspirations, celebrations become an important opportunity for political mobilization ; coordination with the commemoration of Communist ties, integrated power factions, unite all the people, celebrations become an important way to political integration; with the celebration to give the Comintern, the Soviet Union and other countries in the world to meet and support a coordinated international relations commemoration important medium