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| 1 | Bessel Terahertz Pulses from Superluminal Laser Plasma Filaments显示文摘Terahertz radiation with a Bessel beam profile is demonstrated experimentally from a two-color laser filament in air,which is induced by tailored femtosecond laser pulses with an axicon.The temporal and spatial distributions of Bessel rings of the terahertz radiation are retrieved after being collected in the far field.A theoretical model is proposed,which suggests that such Bessel terahertz pulses are produced due to the combined effects of the inhomogeneous superluminal flament structure and the phase change of the two-color laser components inside the plasma channel.These two efects lead to wavefront crossover and constructive/destructive interference of terahertz radiation from different plasma sources along the laser flament,respectively.Compared with other methods,our technique can support the generation of Bessel pulses with broad spectral bandwidth.Such Bessel pulses can propagate to the far field without significant spatial spreading,which shall provide new opportunities for terahertz applications. | Zhelin Zhang Jiayang Zhang Yanping Chen Tianhao Xia Linzheng Wang Bonan Han Feng He Zhengming Sheng Jie Zhang | 2022 | Ultrafast Science2022，，1： | 0 |
| 2 | Analysis of Microstructure of Reactor Pressure Vessel Steel due to Thermal Aging Effect by Small-angle Neutron Scattering显示文摘Reactor pressure vessels are of great importance for nuclear power safety and play an extremely important role in the safe operation of reactors and in preventing nuclear leakage.As material microstructure probe,neutrons have the advantages of high penetrability,ability to distinguish between adjacent nuclide and sensitivity to magnetism.The small-angle neutron scattering can accurately obtain the size distribution,volume fraction and composition of the defects of the nanosized copper clusters in the pressure vessel steel matrix,revealing the microstructure mechanism of the macroscopic mechanical properties.The thermal aging supervision samples from a nuclear power plant in China had been analyzed by small-angle neutron scattering. | LI Bonan WANG Zijun LIU Rongdeng HAN Songbai SUN Kai CHEN Dongfeng LIU Yuntao WANG Chenglong TONG Zhenfeng LI Tianfu | 2018 | 中国原子能科学研究院年报2018，，1： | 0 |
| 3 | Green antisolvent additive engineering to improve the performance of perovskite solar cells显示文摘High-quality perovskite films with larger grain size and fewer defects is a prerequisite for highperformance perovskite solar cells(PSCs).Antisolvent-assisted crystallization is an effective approach to obtain compact and uniform perovskite films;however,the majority of antisolvents currently applied have strong toxicity,and the control of perovskite crystallization is not easy through single antisolvent.In this work,a green antisolvent of ethyl acetate(EA)with acetylacetone(AA)additive is used to fine-tune perovskite crystallization and passivate defect,which produces uniform and compact CH;NH;PbI;perovskite films having larger grain and fewer grain boundaries and reduced defect density.Meanwhile,the interfacial hydrophobic characteristic of the perovskite films is enhanced.At the optimized concentration of AA in EA,the power conversion efficiency(PCE)of the CH;NH;PbI;PSCs was improved from 19.2%to 21.1%and their stability in air was also enhanced.These results present a green antisolvent additive engineering strategy to enhance the crystallinity,passivate defects,and fabricate efficient and stable PSCs. | Jiahui Li Xiaodong Hua Fei Gao Xiaodong Ren Chaoqun Zhang Yu Han Yuanrui Li Bonan Shi Shengzhong(Frank)Liu | 2022 | Journal of Energy Chemistry2022，31，3： | 0 |
| 4 | Small Angle Scattering Study of PAMAM Dendrimer and Its Complex显示文摘The temperature effect on the intermolecular structure of generation 5(G5)poly(amidoamine)(PAMAM)dendrimer in aqueous solutions at different acidic conditions were investigated by using small angle neutron and X-ray scattering(SAS)technique.Upon increasing temperature,a dramatic broadening of the intermolecular structure factor S(Q)peak in the SAS results is clearly shown in Fig.1.This can be attributed | LI Tianfu HAN Wenze WANG Yu CHEN Dongfeng LIU Yuntao LIU Rongdeng ZHANG Li WANG Zijun LI Bonan | 2017 | Annual Report of China Institute of Atomic Energy2017，，1： | 0 |
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