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您的检索式：作者名="SHIFEI HAN"
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| 1 | Design of coherent wideband radiation process in a Nd3+-doped high entropy glass system显示文摘We discover that the spatially coherent radiation within a certain frequency range can be obtained without a common nonlinear optical process.Conventionally,the emission spectra were obtained by de-exciting excited centers from real excited energy levels to the ground state.Our findings are achieved by deploying a high-entropy glass system(HEGS)doped with neodymium ions.The HEGS exhibits a much broader infrared absorption than common glass systems,which can be attributed to be high-frequency optical branch phonons or allowable multi-phonon processes caused by phonon broadening in the system.A broadened phonon-assisted wideband radiation(BPAWR)is induced if the pump laser is absorbed by the system.The subsequent low-threshold self-absorption coherence modulation(SACM)can be controlled by changing excitation wavelengths,sample size,and doping concentrations.The SACM can be red-shifted through the emission of phonons of the excited species and be blue-shifted by absorbing phonons before they are de-excited.There is a time delay up to 1.66 ns between the pump pulse and the BPAWR when measured after traveling through a 35 mm long sample,which is much longer than the Raman process.The BPAWR-SACM can amplify the centered non-absorption band with a gain up to 26.02 dB.These results reveal that the shift of the novel radiation is determined by the frequency of the non-absorption band near the absorption region,and therefore the emission shifts can be modulated by changing the absorption spectrum.When used in fiber lasers,the BPAWR-SACM process may help to achieve tunability. | LINDE ZHANG JINGYUAN ZHANG XIANG WANG MENG TAO GANGTAO DAI JING WU ZHANGWANG MIAO SHIFEI HAN HAIJUAN YU Xuechun Lin | 2022 | Light(Science & Applications)2022，11，9： | 1 |
| 2 | When more is less:The other side of artificial intelligence recommendation显示文摘Based on consumers'preferences.Al(artificial intelligence)recommendation automati-cally filters information,which provokes scholars'debate.Supporters believe that by analyzing the consumers'preferences,Al recommendation enables consumers to choose products more quickly and at a lower cost.Critics deem that consumers are more easily trapped in information cocoons because of the use of Al recommendations.This reduces the possibility of consumers contacting a variety of commodities,thus lowering the con-sumer decision quality.Based on experiments.this paper discusses the moderating role of Al recommendation on the relationship between consumers'preferences and information cocoons.Moreover,it examines the relationship between information cocoons and con-sumer decision quality.The fndings are:Al recommendation strengthens consumers'preferences;consumers'preferences are positively correlated with information cocoons and further lead to the decline of consumers'decision quality.In the Al era.this paper contributes to revealing the dark sides of AI recommendation and provides empirical evidence for the regulation of Al behaviors. | Sihua Chen Han Qiu Shifei Zhao Yuyu Han Wei He Mikko Siponen Jian Mou Hua Xiao | 2022 | Journal of Management Science and Engineering2022，7，2： | 0 |
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