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Constructing core@shell SiO2@C-Au multicomponent nanocomposites to enhance conduction and polarization loss capabilities for microwave absorption and antimicrobial 认领 引用 被引量：2
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作者 Xiaofeng Gong Jing Dang +7 位作者 Junxiong Xiao Xihui Wang Tianming Jia Li Yao Jing-Liang Yang Xiaosi Qi Yunpeng Qu Wei Zhong 《Nano Research》 SCIE EI CSCD 2025年第9期1268-1279,共12页
Conduction and/or polarization loss play a key role in improving electromagnetic wave(EMW)absorption.In this work,a combined polymerization and high-heat treatment process was utilized to efficiently fabricate core@sh... Conduction and/or polarization loss play a key role in improving electromagnetic wave(EMW)absorption.In this work,a combined polymerization and high-heat treatment process was utilized to efficiently fabricate core@shell structure SiO2@C adopting SiO2nanospheres as a hard template.The acquired SiO2@C nanocomposites displayed unsatisfied EMW absorption performances with minimum reflection loss value of-34.92 dB at 6.35 mm,and effective absorption bandwidth value of 3.20 GHz at 4.83 mm,respectively.In order to further comprehensively boost its microwave absorption performances(MAPs),a facile self-assembly strategy was adopted to load Au nanoparticles on the outer surface of SiO2@C nanospheres,constructing core@shell SiO2@C-Au multicomponent nanocomposites(MCNCs).By regulating the volume of Au nanoparticles,different Au contents of SiO2@C-Au MCNCs could be selectively produced in high efficiencies.The obtained outcomes demonstrated that the SiO2@C-Au MCNCs presented improved properties including EMW attenuation,impedance matching,conduction loss and polarization loss with increasing the content of Au nanoparticles.Thanks to the introduction of conductive Au nanoparticles and excellent interfacial effects,the SiO2@C-Au MCNCs presented the greatly improved antimicrobial and EMW absorption performances including strong absorption,wide bandwidth and small thicknesses.Consequently,this finding offered a novel strategy to construct core@shell SiO2@C-Au MCNCs,which simultaneously boosted conduction and polarization loss capabilities for EMW absorption. 展开更多
关键词 SiO2@C-Au core@shell structure conduction and polarization loss microwave absorption antimicrobial
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Face anti-spoofing based on multi-modal and multi-scale features fusion 认领 引用
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作者 Kong Chao Ou Weihua +4 位作者 Gong Xiaofeng Li Weian Han Jie Yao Yi Xiong Jiahao 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 2022年第6期73-82,共10页
Face anti-spoofing is used to assist face recognition system to judge whether the detected face is real face or fake face. In the traditional face anti-spoofing methods, features extracted by hand are used to describe... Face anti-spoofing is used to assist face recognition system to judge whether the detected face is real face or fake face. In the traditional face anti-spoofing methods, features extracted by hand are used to describe the difference between living face and fraudulent face. But these handmade features do not apply to different variations in an unconstrained environment. The convolutional neural network(CNN) for face deceptions achieves considerable results. However, most existing neural network-based methods simply use neural networks to extract single-scale features from single-modal data, while ignoring multi-scale and multi-modal information. To address this problem, a novel face anti-spoofing method based on multi-modal and multi-scale features fusion(MMFF) is proposed. Specifically, first residual network(Resnet)-34 is adopted to extract features of different scales from each modality, then these features of different scales are fused by feature pyramid network(FPN), finally squeeze-and-excitation fusion(SEF) module and self-attention network(SAN) are combined to fuse features from different modalities for classification. Experiments on the CASIA-SURF dataset show that the new method based on MMFF achieves better performance compared with most existing methods. 展开更多
关键词 face anti-spoofing multi-modal fusion multi-scale fusion self-attention network(SAN) feature pyramid network(FPN)
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Single inclusive hadron production at the LHC with an improved impact parameter dependent saturation model 认领 引用
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作者 弓晓锋 蔡燕兵 +1 位作者 周代翠 向文昌 《Chinese Physics C》 SCIE CAS CSCD 2023年第6期89-98,共10页
To obtain a reasonable description of the hadron production at the LHC energies,the impact parameter dependent saturation model is modified by inclusion of an anomalous dimensionγ,which controls the slope of the scat... To obtain a reasonable description of the hadron production at the LHC energies,the impact parameter dependent saturation model is modified by inclusion of an anomalous dimensionγ,which controls the slope of the scattering amplitude in the transition from the dilute region to the saturation region.We calculate the transverse momentum distribution and nuclear modification factor of theπ0and charged hadrons with the improved model,and the results are consistent with measurements performed at the LHC.Moreover,we use the original impact parameter dependent model to study the aforementioned measurements performed at the LHC by adjusting its parameters.We find that the improved model is more consistent with the experimental data than the original one,as the anomalous dimension plays a significant role in the suppression of the evolution of the scattering amplitude. 展开更多
关键词 gluon saturation high energy heavy ion collisions small-x physics
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