We explore the impact of pumping beams with different transverse intensity profiles on the performance of the spinexchange relaxation-free(SERF) atomic magnetometers(AMs). We conduct experiments comparing the traditio...We explore the impact of pumping beams with different transverse intensity profiles on the performance of the spinexchange relaxation-free(SERF) atomic magnetometers(AMs). We conduct experiments comparing the traditional Gaussian optically-pumped AM with that utilizing the flat-top optically-pumped(FTOP) method. Our findings reveal that the FTOP-based approach outperforms the conventional method, exhibiting a larger response, a narrower magnetic resonance linewidth, and a superior low-frequency noise performance. Specifically, the use of FTOP method leads to a 16% enhancement in average sensitivity within 1 Hz–30 Hz frequency range. Our research emphasizes the significance of achieving transverse polarization uniformity in AMs, providing insights for future optimization efforts and sensitivity improvements in miniaturized magnetometers.展开更多
The integrated development of population aging and digital information age has brought an insurmountable“digital divide”to the elderly.We propose a method to profile the digital divide of the elderly by text mining,...The integrated development of population aging and digital information age has brought an insurmountable“digital divide”to the elderly.We propose a method to profile the digital divide of the elderly by text mining,Baidu index and principal component analysis.The top ten scenarios related to the digital divide of the elderly are extracted,which are mobile,payment,phone,QR code,technology,WeChat,Alipay,cash,insurance and medical.The attention distribution of different scenarios in major cities in China was investigated and classified.The results suggest that the health code,social media,and online insurance need higher policy attention to promote narrow digital divide measure.And an inconsistency between netizens'attention and news reports makes Internet search behaviors have the potential to be a real-time supplement to narrow the digital divide among the elderly.The problem states of different cities reflect spatial heterogeneity and temporal asynchrony.The proposed method timely tracks the scenarios of the elderly's digital divide,providing effective insights and references to policy making and services and products improvement,and also providing suggestions for optimizing the development of“Internet+”aging.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No. 62303029)the China Postdoctoral Science Foundation (Grant No. 2022M720364)the Innovation Program for Quantum Science and Technology (Grant Nos. 2021ZD0300500 and 2021ZD0300503)。
文摘We explore the impact of pumping beams with different transverse intensity profiles on the performance of the spinexchange relaxation-free(SERF) atomic magnetometers(AMs). We conduct experiments comparing the traditional Gaussian optically-pumped AM with that utilizing the flat-top optically-pumped(FTOP) method. Our findings reveal that the FTOP-based approach outperforms the conventional method, exhibiting a larger response, a narrower magnetic resonance linewidth, and a superior low-frequency noise performance. Specifically, the use of FTOP method leads to a 16% enhancement in average sensitivity within 1 Hz–30 Hz frequency range. Our research emphasizes the significance of achieving transverse polarization uniformity in AMs, providing insights for future optimization efforts and sensitivity improvements in miniaturized magnetometers.
文摘The integrated development of population aging and digital information age has brought an insurmountable“digital divide”to the elderly.We propose a method to profile the digital divide of the elderly by text mining,Baidu index and principal component analysis.The top ten scenarios related to the digital divide of the elderly are extracted,which are mobile,payment,phone,QR code,technology,WeChat,Alipay,cash,insurance and medical.The attention distribution of different scenarios in major cities in China was investigated and classified.The results suggest that the health code,social media,and online insurance need higher policy attention to promote narrow digital divide measure.And an inconsistency between netizens'attention and news reports makes Internet search behaviors have the potential to be a real-time supplement to narrow the digital divide among the elderly.The problem states of different cities reflect spatial heterogeneity and temporal asynchrony.The proposed method timely tracks the scenarios of the elderly's digital divide,providing effective insights and references to policy making and services and products improvement,and also providing suggestions for optimizing the development of“Internet+”aging.
