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The Impact of Public Health Emergency Events on Health Behaviors : Evidence from the COVID-19
Chenxi Guo,Qiuju Yin,Wanxin Qiao 한국경영정보학회 2021 한국경영정보학회 학술대회논문집 Vol.2021 No.11
The emergence of public health events has a devastating impact on the health of people. However, it is still unclear whether the outbreak of public health emergency event would influence the people’s health behaviors in online health communities. In this study, we collect the data of users’ physical activities and content-generation activities from a large online health community in China from January 2019 to April 2021, in which period COVID-19 had outbroken in China. Through adopting an interrupted time-series strategy, we find that users expend greater effort on improving the physical activity level as compared with the time before the COVID-19. The burst of COVID-19 makes people pay more attention to their health and improve their health awareness. Furthermore, we observe that after the COVID-19, users are more likely to share contents on the community. Our results have implications for public health and online community management.
One-Year Continuous Measurement of Outdoor Radon Progeny Concentration in Beijing Area
Zhang, Lei,Wang, Yunxiang,Guo, Qiuju The Korean Association for Radiation Protection 2020 방사선방어학회지 Vol.45 No.3
Background: Compared with reported data of radon concentration, data of radon progeny concentration is limited in general, especially in outdoor environment. Materials and Methods: To know both the level and the variation of radon progeny concentration in outdoor environment in Beijing area, one-year continuous measurement with a cycle of 60 minutes was carried out by a step-advanced filter (SAF) monitor for radon progeny measurement. The observation site was located in a park in Eastern Beijing area, and the observation period was from October 17, 2018 to September 29, 2019. Results and Discussion: The equivalent equilibrium concentration (EEC) of radon progeny varies from 0.7 to 19.1 Bq·m<sup>-3</sup>, with an annual average of 4.9 ± 2.7 Bq·m<sup>-3</sup>. A clear diurnal variation of EEC, higher in the early morning and lower in the late afternoon, is observed due to the high sensitivity of the SAF monitor. Conclusion: Vertical convection of atmospheric boundary layer is thought to be the main reason of this phenomenon. For annual variation, the lowest monthly average EEC appeared in April, while the highest appeared in November, which might attribute to the atmospheric stability in different seasons.
Yang, Yankang,Qiu, Beibei,Chen, Shanshan,Zhou, Qiuju,Peng, Ying,Zhang, Zhi-Guo,Yao, Jia,Luo, Zhenghui,Chen, Xiaofeng,Xue, Lingwei,Feng, Liuliu,Yang, Changduk,Li, Yongfang The Royal Society of Chemistry 2018 Journal of materials chemistry. A, Materials for e Vol.6 No.20
<P>Solution-processed organic solar cells (OSCs) have been attracting more and more attention for a series of well-known advantages, and power conversion efficiencies (PCEs) of over 11% have been reported. However, the highest PCE of the OSCs based on small molecule donor/polymer acceptor blends is only 4.82%, which was much lower than those of other types of OSCs due to weak absorption of the polymer acceptor and the unbalanced charge carrier mobility of the small molecule donor and the polymer acceptor. Here, we fabricated small molecule donor/polymer acceptor-based OSCs using the wide bandgap SM1 and DR3TBDTT as the small molecular donor and the low-bandgap n-type conjugated polymer PZ1 as the polymer acceptor. With the treatment of a solvent additive, which can promote the absorption intensity, enhance the carrier mobility and suppress the charge carrier recombination, the SM1-based devices and the DR3TBDTT-based devices show PCEs of 3.97% and 5.86%, respectively. It is worth mentioning that the PCE of 5.86% is the state-of-the-art efficiency for OSCs based on the small molecular donor/polymer acceptor system.</P>