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Defence Technology（防务技术） 2024年第5期35卷 1-17页

作者： Hao Xue Tao Wang Xinyu cui yifan Wang Guangyan Huang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

Material and structure made by additive manufacturing(AM)have received much attention lately due to their flexibility and ability to customize complex structures.This study first implements multiple objective topology optimization simulations based on a projectile perforation model,and a new topologic projectile is obtained.Then two types of 316L stainless steel projectiles(the solid and the topology)are printed in a selective laser melt(SLM)machine to evaluate the penetration performance of the projectiles by the ballistic test.The experiment results show that the dimensionless specific kinetic energy value of topologic projectiles is higher than that of solid projectiles,indicating the better penetration ability of the topologic projectiles.Finally,microscopic studies(scanning electron microscope and X-ray micro-CT)are performed on the remaining projectiles to investigate the failure mechanism of the internal structure of the topologic projectiles.An explicit dynamics simulation was also performed,and the failure locations of the residual topologic projectiles were in good agreement with the experimental results,which can better guide the design of new projectiles combining AM and topology optimization in the future.

关键词： Additive manufacturing Topology optimization Ballistic performance Projectile design

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Efficient and bright broadband electroluminescence based on environmentfriendly metal halide nanoclusters

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Light(Science & Applications) 2024年第4期13卷 727-737页

作者： Dingshuo Zhang Meiyi Zhu yifan He Qingli Cao Yun Gao Hongjin Li Guochao Lu Qiaopeng cui Yongmiao Shen Haiping He Xingliang Dai Zhizhen Ye School of Materials Science and Engineering State Key Laboratory of Silicon and Advanced Semiconductor MaterialsZhejiang University310027 HangzhouChina. Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials and Engineering Research Centre of Zhejiang Province Institute of WenzhouZhejiang University325006 WenzhouChina. Wenzhou XINXINTAIJING Tech.Co.Ltd. 325006 WenzhouChina. Department of Chemistry Zhejiang Sci-Tech University310018 HangzhouChina

Broadband electroluminescence based on environment-friendly emitters is promising for healthy lighting yet remains an unprecedented challenge to progress.The copper halide-based emitters are competitive candidates for broadband emission,but their high-performance electroluminescence shows inadequate broad emission bandwidth of less than 90 nm.Here,we demonstrate efficient ultra-broadband electroluminescence from a copper halide(cui)nanocluster single emitter prepared by a one-step solution synthesis-deposition process,through dedicated design of ligands and subtle selection of solvents.The cui nanocluster exhibits high rigidity in the excitation state as well as dual-emissive modes of phosphorescence and temperature-activated delayed fluorescence,enabling the uniform cluster-composed film to show excellent stability and high photoluminescent efficiency.In consequence,ultra-broadband light-emitting diodes(LEDs)present nearly identical performance in an inert or air atmosphere without encapsulation and outstanding high-temperature operation performance,reaching an emission full width at half maximum(FWHM)of~120 nm,a peak external quantum efficiency of 13%,a record maximum luminance of~50,000 cd m^(−2),and an operating half-lifetime of 137 h at 100 cd m^(−2).The results highlight the potential of copper halide nanoclusters for next-generation healthy lighting.

关键词： halide cluster rigidity

Remarkable enhancement of bleomycin production through precise amplification of its biosynthetic gene cluster in Streptomyces verticillus

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Science China(Life Sciences) 2022年第6期65卷 1248-1256页

作者： Hong Li Wenyan Gao yifan cui Yuanyuan Pan Gang Liu State Key Laboratory of Mycology Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China The Innovative Academy of Seed Design Chinese Academy of SciencesBeijing 100864China

Amplification of biosynthetic gene clusters is important to increase secondary metabolite production.However,the copy number of amplified gene clusters is difficult to control precisely.In this study,the tandem amplification of a 70 kb bleomycin biosynthetic gene cluster was precisely regulated through the combined strategy of a Zou A-dependent DNA amplification system and double-reporter-guided recombinant selection in Streptomyces verticillus ATCC15003.The production of bleomycin in the recombinant strain containing six copies of the bleomycin gene cluster was 9.59-fold higher than that in the wild-type strain.The combined strategy used in this study is powerful and applicable for precisely regulating the amplification of gene clusters and improving the corresponding secondary metabolite production.

关键词： bleomycin precise regulation amplification of gene cluster strain improvement

Does palynological diversity reflect floristic diversity?A case study from Northeast China

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中国科学:地球科学英文版 2023年第9期66卷 2097-2108页

作者： yifan cui Feng QIN Yan ZHAO Qiaoyu cui Rongwei GENG Quan LI Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Cluster of Excellence ROOTS Institute of Pre-and Protohistoric ArchaeologyKiel UniversityKiel 24118Germany

Fossil pollen data can provide important information of past vegetation diversity,on the basis of established relationship between modern palynological and floristic diversity.However,current studies on modern pollen assemblages in China have not examined this relationship yet.Herein,we report a case study from Northeast China,aiming to investigate the representation of modern palynological diversity to regional floristic diversity.A total of 87 sets of modern pollen and vegetation data from various vegetation types were applied to assess modern palynological diversity and floristic diversity in Northeast China,and the relationship between palynological and floristic diversity was studied using spatial pattern comparison and correlation analysis.Moreover,to reduce representation bias related to pollen production and dispersal,we calibrated pollen data using the Regional Estimates of Vegetation Abundance from Large Sites(REVEALS)model with Pollen Productivity Estimates(PPEs)and Fall Speeds of Pollen(FSP).The results show that the spatial variations of palynological and floristic richness among vegetation types are similar,and have a good positive correlation(r=0.41,p0.05).The calibration on pollen data using REVEALS model minimized the differences in spatial patterns between palynological and floristic diversity,and improved the correlations between them(richness,r=0.50,p<0.01;evenness,r=0.33,p<0.01).Our study indicates that palynological richness in Northeast China could reflect regional floristic richness in general,and the calibration with REVEALS model is recommended for reconstructing past floristic diversity from pollen data.

关键词： Northeast China Modern palynological diversity Floristic diversity Richness and evenness Community dissimilarity index REVEALS model

Exploring the role of iron in Fe_(5)Ni_(4)S_(8)toward oxygen evolution through modulation of electronic orbital occupancy

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Journal of Energy Chemistry 2024年第5期92卷 52-62页

作者： Zhengyan Du Zeshuo Meng Haoteng Sun yifan Li Chao Jiang Yaxin Li Xiaoying Hu Yi cui Shansheng Yu Hongwei Tian Key Laboratory of Automobile Materials of MOE School of Materials Science and EngineeringJilin UniversityChangchun 130012JilinChina College of Science and Laboratory of Materials Design and Quantum Simulation Changchun UniversityChangchun 130022JilinChina i-lab Vacuum Interconnected Nanotech Workstation(Nano-X)Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123JiangsuChina Department of Chemistry Brown UniversityRI 02912United States

Ni-Fe-based catalysts are considered to be among the most active catalysts for the oxygen evolution reaction(OER)under alkaline conditions,with Fe playing a crucial role.However,Fe leaching occurs during the reaction due to thermodynamic instability,which has resulted in conflicting reports within the literature regarding its role.To clarify this point,we propose a strategy consisting of modulating the electronic orbital occupancy to suppress the extensive loss of Fe atoms during the OER process.Theoretical calculations,in-situ X-ray photoelectron spectroscopy,molecular dynamics simulations,and a series of characterization showed that the stable presence of Fe not only accelerates the electron transfer process but also optimizes the reaction barriers of the oxygen evolution intermediates,promoting the phase transition of Fe_(5)Ni_(4)S_(8)to highly active catalytic species.The modulated Fe_(5)Ni_(4)S_(8)-based pre-catalysts exhibit improved OER activity and long-term durability.This study provides a novel perspective for understanding the role of Fe in the OER process.

关键词： Oxygenevolution Fe_(5)Ni_(4)S_(8) Electronic orbital occupancy modulation Reconstruction dynamics

Theoretical Research on a D-band Traveling Wave Extended Interaction Amplifier

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Chinese Journal of Electronics 2024年

作者： Zhongtao cui Xuesong YUAN Xiaotao XU Dongrui CHEN yifan ZU Matthew Thomas Cole Qingyun CHEN Yang YAN Terahertz Science and Technology Key Laboratory of Sichuan Province School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of China Department of Electronic and Electrical Engineering University of Bath

A traveling-wave, extended interaction amplifier is herein investigated for use in millimeter-wave and terahertz amplification sources. By placing engineered extended interaction cavities between the traveling wave structures, higher gain is obtained with a shorter high frequency circuit, compared with conventional traveling wave tubes architectures. The bandwidth of the device is significantly increased relative to extended interaction klystrons. A Dband beam wave interaction circuit of 26 mm long has been designed. Particle in cell simulations at 21.5 kV operating voltage, 0.3 A beam current, and 5 mW input power show that the maximum output power reaches 351 W, with a gain of 48.4 dB and 3-dB bandwidth of 1.42 GHz.

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The phased chromosome-scale genome of yellowhorn sheds light on the mechanism of petal color change

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Horticultural Plant Journal 2023年第6期9卷 1193-1206页

作者： Quanxin Bi Mengke Wang Jiang Li Jinmin Lian Yongchao Niu yifan cui Xiaojuan Liu Haiyan Yu Libing Wang State Key Laboratory of Tree Genetics and Breeding Research Institute of ForestryChinese Academy of ForestryBeijing 100091China Biozeron Shenzhen Inc.ShenzhenGuangzhouGuangdong 518000China

Yellowhorn(Xanthoceras sorbifolium), especially its varieties, is the red petal yellowhorn(X. sorbifolium var. purpurea), an important tree species with great ornamental value, and its flower petals change color throughout the flowering period. In this study, we mainly focused on the mechanism of the petal color change with transcriptomics and metabolomics data. A phased chromosome-scale assembly of the red petal yellowhorn genome was generated using the PacBio high-fidelity reads, Illumina short reads, and Phase genomics Proximo Hi-C data. The final de novo assembly yielded 533.67 Mb with a contig N50 of 5.42 Mb, and 27 501 protein-coding genes were predicted. Notably, an alternate haplotig assembly was also obtained. Furthermore, a variation database for the alleles within the genome was constructed. Subsequently, the expression pattern of flower pigmentation-related genes and allelic expression imbalance events were investigated. Apart from 6 genes involved in the anthocyanin biosynthesis pathway regulated by the activation of 15 MYB-bHLH-WD40s, the increased expression of senescencerelated gene 1(SRG1) and 2-oxoglutarate-dependent dioxygenase(DIOX5) might also result in decreasing content of lutein and increasing abundance of(E/Z)-phytoene, cyanidin-3-O-rutinoside, and cyanidin-3-O-sambubioside. These changes in genes and metabolites were most likely related to the petal color change in red petal yellowhorn. This phased chromosome-scale genome assembly provides more accurate genomic information for future molecular breeding and facilitates allele function studies of the red petal yellowhorn.

关键词： Xanthoceras sorbifolium var.purpurea Phased genome Metabolomics Transcriptomics Petal color

A study on the biocompatibility of ramie fibre for medical dressing application

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Biosurface and Biotribology 2023年第4期9卷 169-175页

作者： Changsheng Wei Shibing Xiong Siqi Zhang yifan cui Simeng Wang Xugang Lu Jun Chen Mei Zhang Bangcheng Yang Engineering Research Center in Biomaterials Sichuan UniversityChengduChina National Engineering Research Center for Biomaterials ChengduChina Sichuan Guojia Biomaterials Co. LtdChengduChina

In order to explore the potential application of Ramie fibre(RF)in medical dressing,the absorbency ratio of ramie fibre cloth,medical gauze and natural cotton fibre cloth was tested,and the factors affecting the absorbency ratio of materials were analysed.Meanwhile,the hemocompatibility of the three fibre materials were also studied.The results showed that the RF cloth had good moisture absorption and hemocompatibility.Therefore,RF is a potential material for medical dressing.

关键词： biocompatibility biointerface

Fuzzy Proportional Integral Derivative control of a voice coil actuator system for adaptive deformable mirrors

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Astronomical Techniques and Instruments 2024年第3期1卷 179-186页

作者： Ziqiang cui Heng Zuo Weikang Qiao Hao Li Fujia Du yifan Wang Jinrui Guo Nanjing Institute of Astronomical Optics&Technology Chinese Academy of SciencesNanjing 210042China CAS Key Laboratory of Astronomical Optics&Technology Nanjing Institute of Astronomical Optics&TechnologyNanjing 210042China University of Chinese Academy of Sciences Beijing 100049China

Research on adaptive deformable mirror technology for voice coil actuators(VCAs)is an important trend in the development of large ground-based telescopes.A voice coil adaptive deformable mirror contains a large number of actuators,and there are problems with structural coupling and large temperature increases in their internal coils.Additionally,parameters of the traditional proportional integral derivative(PID)control cannot be adjusted in real-time to adapt to system changes.These problems can be addressed by introducing fuzzy control methods.A table lookup method is adopted to replace real-time calculations of the regular fuzzy controller during the control process,and a prototype platform has been established to verify the effectiveness and robustness of this process.Experimental tests compare the control performance of traditional and fuzzy proportional integral derivative(Fuzzy-PID)controllers,showing that,in system step response tests,the fuzzy control system reduces rise time by 20.25%,decreases overshoot by 78.24%,and shortens settling time by 67.59%.In disturbance rejection experiments,fuzzy control achieves a 46.09%reduction in the maximum deviation,indicating stronger robustness.The Fuzzy-PID controller,based on table lookup,outperforms the standard controller significantly,showing excellent potential for enhancing the dynamic performance and disturbance rejection capability of the voice coil motor actuator system.

关键词： Adaptive optics Deformable mirror Voice coil actuator Fuzzy control

Strategies for bubble removal in electrochemical systems

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能源评论(英文) 2023年第1期2卷 49-60页

作者： Yi He yifan cui Zhongxi Zhao Yongtang Chen Wenxu Shang Peng Tan Department of Thermal Science and Energy Engineering University of Science and Technology of China(USTC)Hefei230026AnhuiChina

Bubbles are known to affect energy and mass transfer in gas-evolving electrodes,including those in water splitting,chlorine generation,direct methanol fuel cells,and carbon dioxide generation.As bubbles vigorously evolve in electrochemical reactions,undesired blockage of active sites and ion conducting pathways result in serious energy losses.Since new advances are made with the development of new theories,materials,and techniques,this review discusses the recent works on promoting bubble removal in electrochemical systems with the aim of guiding and motivating future research in this area.We first provide the mechanism of bubble evolution in electrochemical systems and the resultant overpotentials in detail.Then,recent advances in mitigating bubble issues are presented from the perspectives of passive and active strategies.Passive strategies act on the macro-and micro-structures of the electrode,surface wettability,and electrolyte properties.Active strategies employ out-fields,including flowing electrolytes,acoustic fields,magnetic forces,and photothermal effects,to guide bubbles out of reaction sites aiming at high reaction rates,whereas external energy is needed.Finally,the pros and cons of both strategies and future outlooks are presented.This review leads to design guidelines for highperformance gas-evolving electrochemical systems.

关键词： Active strategy Bubble removal Electrochemical system Passive strategy Superhydrophilic surface