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您的检索式：作者名="Mengxuan Lin"
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| 1 | Vortex Smith-Purcell radiation generation with holographic grating显示文摘Smith–Purcell radiation(SPR)is the electromagnetic wave generated by free electrons passing above a diffraction grating,and it has played an important role in free-electron light sources and particle accelerators.Orbital angular momentum(OAM)is a new degree of freedom that can significantly promote the capacity of information carried by an electro-magnetic beam.In this paper,we propose an integrable method for generating vortex Smith–Purcell radiation(VSPR),namely,SPR carrying OAM,by having free-electron bunches pass on planar holographic gratings.VSPRs generated by different electron energies,with different topological charges of the OAM,radiation angles,and frequencies are demonstrated numerically.It is also found that,for high-order radiation,the topological charge of the OAM wave will be multiplied by the radiation order.This work introduces a new way to generate SPR with OAM and provides a method to achieve an integratable and tunable free-electron OAM wave source at different frequency regions. | MENGXUAN WANG FANG LIU YUECHAI LIN KAIYU CUI XUE FENG WEI ZHANG YIDONG HUANG | 2020 | Photonics Research2020，8，8： | 2 |
| 2 | Quantitative analysis of the impact of various urban socioeconomic indicators on search-engine-based estimation of COVID-19 prevalence显示文摘Numerous studies have proposed search engine-based estimation of COVID-19 prevalence during the COVID-19 pandemic;however,their estimation models do not consider the impact of various urban socioeconomic indicators(USIs).This study quantitatively analysed the impact of various USIs on search engine-based estimation of COVID-19 prevalence using 15 USIs(including total population,gross regional product(GRP),and population density)from 369 cities in China.The results suggested that 13 USIs affected either the correlation(SC-corr)or time lag(SC-lag)between search engine query volume and new COVID-19 cases(p<0.05).Total population and GRP impacted SC-corr considerably,with their correlation coefficients r for SC-corr being 0.65 and 0.59,respectively.Total population,GRP per capita,and proportion of the population with a high school diploma or higher had simultaneous positive impacts on SC-corr and SC-lag(p<0.05);these three indicators explained 37e50%of the total variation in SC-corr and SC-lag.Estimations for different urban agglomerations revealed that the goodness of fit,R2,for search engine-based estimation was more than 0.6 only when total urban population,GRP per capita,and proportion of the population with a high school diploma or higher exceeded 11.08 million,120,700,and 38.13%,respectively.A greater urban size indicated higher accuracy of search engine-based estimation of COVID-19 prevalence.Therefore,the accuracy and time lag for search engine-based estimation of infectious disease prevalence can be improved only when the total urban population,GRP per capita,and proportion of the population with a high school diploma or higher are greater than the aforementioned thresholds. | Ligui Wang Mengxuan Lin Jiaojiao Wang Hui Chen Mingjuan Yang Shaofu Qiu Tao Zheng Zhenjun Li Hongbin Song | 2022 | Infectious Disease Modelling2022，7，2： | 0 |
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