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Shortened processing duration of high-performance Sm-Co-Fe-Cu-Zr magnets by stress-aging

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Journal of Materials Science & Technology 2022年第11期106卷 70-76页

作者： Xianglong Zhou tao yuan Tianyu Ma Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of Materialsand MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterXi’an Jiaotong UniversityXi’an 710049China The Southwest Applied Magnetism Research Institute Mianyang 621000China

Simultaneously achieving high energy product and high coercivity in the 2:17-type Sm-Co-Fe-Cu-Zr high temperature magnets has been closely relied on long-term isothermal aging to develop complete cellu-lar *** this work,we report a novel stress-aging approach that can substantially shorten the aging time to fabricate high-performance Sm-Co-Fe-Cu-Zr *** exhibited by a model magnet Sm_(25) Co_(50.2) Fe_(16.2) Cu_(5.6) Zr_(3.0)(wt.%),applying 90 MPa compressive stress can shorten the aging time from 20 h for conventional isothermal aging to 10 h at the same aging temperature for achieving nearly equiv-alent magnetic *** comparative study between the 10 h-aged samples under stress-containing and stress-free conditions revealed that the stress not only promotes the precipitation of the cell boundary phase that are essential for enhancing the coercivity but also accelerates the dissociation of the cell edge defects that are detrimental to squareness factor,without destroying the[001]crystal-lographic *** microstructural improvements enable the achievement of high-performance with maximum energy product of∼30 MGOe and coercivity above 35 kOe at reduced aging time.

关键词： Permanent magnets Sm-Co magnets Precipitation Stress-aging

Seismic damage of mountain tunnels during the 5.12 Wenchuan earthquake

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Journal of Mountain Science 2016年第11期13卷 1958-1972页

作者： YU Hai-tao CHEN Jun-tao yuan Yong ZHAO Xu Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of Technology Beijing 100124 China

A number of mountain tunnels suffered significant damage to various extent during the 2008 Wenchuan earthquake in *** ranging from small to heavy cracking was observed both at the portal and inside the tunnels,while some sections close to the faults completely collapsed.A summary of qualitative data collected from reports and papers is presented regarding the behavior of the 55 mountain tunnels near the epicenter during the *** on the seismic investigation and data collection of mountain tunnels,the tunnel damage is classified into six most common damage models involving cracking,spalling,shear failure,dislocation,pavement uplift and *** study and discussion are then carried out on the damage *** order to examine the influencing factors of the damage magnitude of the mountain tunnels,the correlations between epicentral distance,earthquake intensity,overburden depth,geological condition and damage levels are *** relationships between earthquake parameters and different damagemodels are developed and ***,suggestions are provided to improve the seismic resistance of mountain tunnels.

关键词： Wenchuan earthquake Mountain tunnels Damage model Influencing factors Seismic capacity

Indium tin oxide-free inverted polymer solar cells with ultrathin metal transparent electrodes

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Frontiers of Optoelectronics 2017年第4期10卷 402-408页

作者： tao yuan Zhonghuan CAO Guoli TU Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China

Efficient indium tin oxide （ITO）-free inverted polymer solar cells （PSCs） were fabricated by applying ultrathin metal transparent electrodes as sunlight incident electrodes. Smooth and continuous Ag film of 4 nm thickness was developed through the introduction of a 2 nm Au seed layer. Ultrathin Ag transparent electrode with an average transmittance of up to 80% from 480 to 680 nm and a sheet resistance of 35.4Ω/sq was obtained through the introduction of a ZnO anti-reflective layer. The ultrathin metal electrode could be directly used as cathode in polymer solar cells without oxygen plasma treatment. ITO-free inverted PSCs obtained a power conversion efficiency （PCE） of 5.2% by utilizing the ultrathin metal transparent electrodes. These results demonstrated a simple method of fabricating ITO-free inverted PSCs.

关键词： polymer solar cells ultrathin metal transparentelectrodes seed layer anti-reflective layer

Imidazobenzimidazole fused aza-calix[4]arenes:Synthesis,structure,and Zn^(2+)-selective colorimetric-fluorometric sensor

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Chinese Chemical Letters 2023年第12期34卷 204-208页

作者： yuan-tao Huang Min Xue Yong Yang Department of Chemistry Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhou 310018China Department of Physics Key Laboratory of Optical Field Manipulation of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhou 310018China

Tetra(amino)azacalix[4]arene skeleton was functionalized at the bridging NH sites using various aromatic aldehydes via formation of imidazobenzimidazole fused heterocycles.X-ray single crystal analysis revealed distorted 1,3-alternate conformations for the resulting *** and pyrenyl modified imidazobenzimidazole fused aza-calix[4]arenes existed as dimers in the solid state,associated mainly through-stacking interactions between the planar polycyclic *** tetrapyrenyl modified product was further used as a Zn^(2+)-selective sensor,which showed naked-eye detected color change and enhanced excimer *** stoichiometry between the sensor and Zn2+was determined to be 1:1 and the association constant was 1.1×10^(5)L/*** sensing process was highly selective and showed strong anti-interference with presence of other *** UV-vis spectral changes in the sensing process were completely reversible by alternate addition of Zn^(2+) and F^(-),showing an efficient“on-off-on”result.

关键词： Aza-calixarene Imidazobenzimidazole Fluorometric sensor Zn^(2+)-selective

The Classification of Carbon Dots and the Relationship between Synthesis Methods and Properties

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Chinese Journal of Chemistry 2023年第17期41卷 2206-2216页

作者： Xin-Xiang Zhao Song-yuan tao Bai Yang State Key Laboratory of Supramolecular Structure and Materials Collegeof ChemistryJilin UniversityChangchunJilin 130012China

Comprehensive Summary,The carbon dots(CDs),as emerging carbon based nanomaterials,are a kind of fluorescent materials with wide application *** luminous CDs can simply be synthesized by a wide variety of easily accessible *** have excellent optical properties,high biocompatibility and low toxicity,which makes them be used in the fields of optics,biology,energy,and so *** this review,the classification,nomenclature,photoluminescence mechanism and property regulation of CDs are ***.

关键词： Nanoparticles Nanostructures Luminescence Fluorescence Polymerization Carbon dots Classification and nomenclature Structure and performance

Scalable construction of SiO/wrinkled MXene composite by a simple electrostatic self-assembly strategy as anode for high-energy lithium-ion batteries

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Chinese Chemical Letters 2020年第4期31卷 980-983页

作者： Chuanliang Wei Huifang Fei yuan Tian Yongling An yuan tao yuan Li Jinkui Feng Research Center for Carbon Nanomaterials Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials(Ministry of Education)School of Materials Science and EngineeringShandong UniversityJi'nan 250061 China

Available onlineSilicon monoxide(SiO)is a promising anode material fo r lithium-ion batteries(LIBs)due to its high theoretical specific capacity(~2400 mAh/g),low working potential(<0.5 V ***^+/Li),low cost,easy synthesis,nontoxicity,abundant natural source and smaller volume expansion than ***,low intrinsic electrical conductivity,low initial Coulombic efficiency(ICE)and inevitable volume expansion(~200%)impede its practical *** we fabricate SiO/wrinkled MXene composite(SiO-WM)by an electrostatic self-assembly ***,this method is simple,scalable and taking into account all the issues of *** a result,the SiO-WM exhibits imp roved rate capability,cycling performance and ICE than bare SiO.

关键词： SiO Wrinkled MXene Electrostatic self-assembly Anode Lithium-ion batteries

Enhanced conductivity and stability of Prussian blue cathodes in sodium-ion batteries by surface vapor-phase molecular selfassembly

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Nano Research 2024年第5期17卷 4221-4230页

作者： tao yuan Xiaopan Fu yuan Wang Mingjie Li Shuixin Xia Yuepeng Pang Shiyou Zheng School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai 200093China

With many merits such as facile synthesis,economy,and relatively high theoretical capacity,Prussian blue analogs(PBAs)are considered promising cathode materials for sodium-ion batteries(SIBs).However,their practical applications still suffer from a low actual specific capacity and inferior stability owing to the imperfect crystallinity,irreversible phase transition,and low intrinsic ***,a surface-modification technique for vapor-phase molecular self-assembly was developed to prepare Fe-based PBAs,specifically sodium iron hexacyanoferrate(NaFeHCF),with a uniform conductive polymer protective layer of polypyrrole(PPy)on the surface,resulting in NaFeHCF@*** incorporation of a PPy protective layer not only improves the electronic conductivity of NaFeHCF@PPy,but also effectively mitigates the dissolution of Fe-ions during ***,this advanced vapor-phase technique avoids Fe^(2+)oxidation and Na^(+)loss during liquid-phase surface *** NaFeHCF@PPy exhibited a remarkably enhanced cycling performance,with capacity retentions of 85.6%and 69.1%over 500 and 1000 cycles,respectively,at 200 mA/g,along with a superior rate performance up to 5 A/g(fast kinetics).Additionally,by adopting this strategy for Mn-based PBAs(NaMnHCF@PPy),we further demonstrated the universality of this method for PBA cathodes in SIBs.

关键词： sodium-ion battery cathode Prussian blue analogs surface modification vapor-phase molecular self-assembly

Dense pair plasma generation and its modulation dynamics in counter-propagating laser field

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Chinese Physics B 2018年第10期27卷 433-439页

作者： Wei-yuan Liu Wen Luo tao yuan Ji-Ye Yu Min Chen School of Nuclear Science and Technology University of South ChinaHengyang 421001China Key Laboratory for Laser Plasmas（MoE） School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China IFSA Collaborative Innovation Center Shanghai Jiao Tong UniversityShanghai 200240China

With two-dimensional quantum electrodynamics（QED） particle-in-cell simulations, a dense electron-positron（e^-e~＋） pair generation from laser-solid interactions is demonstrated. When the interaction of two linearly polarized laser pulses with a thin target enters into the relativistic transparency regime, a stable standing wave（SW） field can be formed by the overlap of the two counter-propagating laser pulses directly. The present study aims to clarify the effects of the S W field on the dynamics of e^-e^＋ pair plasmas. Our results indicate that under the combined effect of the SW field and radiation reaction（RR） effect, the created e^-e^＋ pairs can be trapped into the electric field nodes when the field strength is *** trapping effect contributes to the generation of γAV≥400 and ultra-dense pair plasmas in the two-side irradiation scheme. Despite different laser intensities, these pair plasmas have a Maxwellian spectral distribution with a peak energy of 150 MeV. Besides, the periodical modulation of the average energy, spatial, phase-space, and angular patterns of the e^-e^＋ pair plasmas can be triggered. In the angular patterns, as long as the SW field exists, pair plasmas can be pinched along the laser polarization direction. These results may offer a better understanding of the laser-solid interactions in the experiments when 10-PW laser facilities come into operation in the future.

关键词： PIC simulation laser-plasma interaction standing wave radiation reaction

Temporal Trend in Lung Cancer Burden Attributed to Ambient Fine Particulate Matter in Guangzhou, China

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Biomedical and Environmental Sciences 2017年第10期30卷 708-717页

作者： LIAO Yu XU Lin LIN Xiao HAO yuan tao Department of Medical Statistics and Epidemiology School of Public HealthSun Yat-sen UniversityGuangzhou 510080GuangdongChina Sun Yat-sen Global Health Institute Institute of State GovernanceSun Yat-sen UniversityGuangzhou 510275GuangdongChina

Objective To estimate the lung cancer burden that may be attributable to ambient fine particulate matter （PM2.5） pollution in Guangzhou city in China from 2005 to 2013. Methods The data regarding PM2.5 exposure were obtained from the ＆#39;Ambient air pollution exposure estimation for the Global Burden of Disease 2013＇ dataset at 0.1° ×0.1° spatial resolution. Disability-adjusted life years （DALYs） were estimated based on the information of mortality and incidence of lung cancer. Comparative risk analysis and integrated exposure-response function were used to estimate attributed disease burden. Results The population-weighted average concentration of PM2.5 was increased by 34.6% between 1990 and 2013, from 38.37 μg/m3 to 51.31 μg/m^3. The lung cancer DALYs in both men and women were increased by 36.2% from 2005 to 2013. The PM2.5 attributed lung cancer DALYs increased from 12105.0 （8181.0 for males and 3924.0 for females） in 2005 to 16489.3 （11291.7 for males and 5197.6 for females） in 2013. An average of 23.1% lung cancer burden was attributable to PM2.5 pollution in 2013. Conclusion PM2.5 has caused serious but under-appreciated public health burden in Guangzhou and the trend deteriorates. Effective strategies are needed to tackle this major public health problem.

关键词： PM2.5 Air pollution Attributable disease burden Lung cancer Disability-adjusted life year Comparative risk analysis