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| 1 | Ultra-thin, planar, Babinet-inverted plasmonic metalenses显示文摘We experimentally demonstrate the focusing of visible light with ultra-thin,planar metasurfaces made of concentrically perforated,30-nm-thick gold films.The perforated nano-voids—Babinet-inverted(complementary)nano-antennas—create discrete phase shifts and form a desired wavefront of cross-polarized,scattered light.The signal-to-noise ratio in our complementary nano-antenna design is at least one order of magnitude higher than in previous metallic nano-antenna designs.We first study our proof-of-concept‘metalens’with extremely strong focusing ability:focusing at a distance of only 2.5 mm is achieved experimentally with a 4-mm-diameter lens for light at a wavelength of 676 nm.We then extend our work with one of these‘metalenses’and achieve a wavelength-controllable focal length.Optical characterization of the lens confirms that switching the incident wavelength from 676 to 476 nm changes the focal length from 7 to 10 mm,which opens up new opportunities for tuning and spatially separating light at different wavelengths within small,micrometer-scale areas.All the proposed designs can be embedded on-chip or at the end of an optical fiber.The designs also all work for two orthogonal,linear polarizations of incident light. | Xingjie Ni Satoshi Ishii Alexander V Kildishev Vladimir M Shalaev | 2013 | Light(Science & Applications)2013，2，1： | 20 |
| 2 | Spatial modeling of the carbon stock of forest trees in Heilongjiang Province, China显示文摘Heilongjiang province is the largest forest zone in China and the forest coverage rate is 46%. Forests of Heilongjiang province play an important role in the forest ecosystem of China. In this study we investigated the spatial distribution of forest carbon storage in Heilongjiang province using 3083 plots sampled in 2010. We attempted to fit two global models, ordinary least squares model(OLS), linear mixed model(LMM), and a local model, geographically weighted regression model(GWR), to the relationship between forest carbon content and stand, environment, and climate factors. Five predictors significantly affected forest carbon storage and spatial distribution, viz. average diameter of stand(DBH), number of trees per hectare(TPH), elevation(Elev), slope(Slope) and the product of precipitation and temperature(Rain_Temp). The GWR model outperformed the two global models in both model fitting and prediction because it successfully reduced both spatial autocorrelation and heterogeneity in model residuals. More importantly, the GWR model provided localized model coefficients for each location in the study area, which allowed us to evaluate the influences of local stand conditions and topographic features on tree and stand growth, and forest carbon stock. It also helped us to better understand the impacts of silvicultural and management activities on the amount and changes of forest carbon storage across the province. The detailed information can be readily incorporated with the mapping ability of GIS software to provide excellent tools for assessing the distribution and dynamics of the forest-carbon stock in the next few years. | Chang Liu Lianjun Zhang Fengri Li Xingji Jin | 2014 | Journal of Forestry Research2014，25，2： | 14 |
| 3 | Distributed coordinated adaptive tracking in networked redundant robotic systems with a dynamic leader显示文摘Distributed coordinated control of networked robotic systems formulated by Lagrange dynamics has recently been a subject of considerable interest within science and technology communities due to its broad engineering applications involving complex and integrated production processes,where high flexibility,manipulability,and maneuverability are desirable characteristics.In this paper,we investigate the distributed coordinated adaptive tracking problem of networked redundant robotic systems with a dynamic leader.We provide an analysis procedure for the controlled synchronization of such systems with uncertain dynamics.We also find that the proposed control strategy does not require computing positional inverse kinematics and does not impose any restriction on the self-motion of the manipulators;therefore,the extra degrees of freedom are applicable for other sophisticated subtasks.Compared with some existing work,a distinctive feature of the designed distributed control algorithm is that only a subset of followers needs to access the position information of the dynamic leader in the task space,where the underlying directed graph has a spanning tree.Subsequently,we present a simulation example to verify the effectiveness of the proposed algorithms. | ZHOU Jin WU XingJie LIU ZengRong | 2014 | Science China(Technological Sciences)2014，57，5： | 14 |
| 4 | Optimal management of Korean pine plantations in multifunctional forestry显示文摘Korean pine is one of the most important plantation species in northeast China.Besides timber,it produces edible nuts and plantations sequester carbon dioxide from the atmosphere.This study optimized the management of Korean pine plantations for timber production,seed production,carbon sequestration and for the joint production of multiple benefits.As the first step,models were developed for stand dynamics and seed production.These models were used in a simulation–optimization system to find optimal timing and type of thinning treatments and optimal rotation lengths.It was found that three thinnings during the rotation period were optimal.When the amount or profitability of timber production is maximized,suitable rotation lengths are 65–70 years and wood production is 5.5–6.0 m^3 ha^(-1) a^(-1).The optimal thinning regime is thinning from above.In seed production,optimal rotation lengths are over 100 years.When carbon sequestration in living biomass is maximized,stands should not be clear-cut until trees start to die due to senescence.In the joint production of multiple benefits,the optimal rotation length is 86 years if all benefits(wood,economic profits,seed,carbon sequestration) are equally important.In this management schedule,mean annual wood production is 5.5 m^2 ha^(-1) and mean annual seed yield 141 kg ha^(-1).It was concluded that it is better to produce timber and seeds in the same stands rather than assign stands to either timber production or seed production. | Xingji Jin Timo Pukkala Fengri Li Lihu Dong | 2017 | Journal of Forestry Research2017，28，5： | 8 |
| 5 | Deformation response of roof in solid backfilling coal mining based on viscoelastic properties of waste gangue显示文摘Solid backfill mining(SBM)is a form of green mining,the core of which is to control and minimize the deformation and movement of strata above longwall coal mines.Establishing a mechanical model that can reliably describe roof deformation by considering the viscoelastic properties of waste gangue is important as it assists in improving mine designs and reducing the environmental impact on the surface.In this paper,the time-dependent deformation characteristics of gangue under different stress levels were obtained by using lateral confinement compression,that reliably represents the compaction of goaf.The viscoelastic foundation model for gangue mechanical response is different from the traditionally used elastic foundation model,as it considers the time factor and viscoelasticity.A mechanical model using a thin plate on a fractional viscoelastic foundation was established,and the roof deflection,bending moment,time-dependent,viscous and other characteristics of SBM were included and analyzed.Compared with the existing elastic foundation model,the proposed fractional order viscoelastic foundation model has higher accuracy with laboratory data.The plate deflection increases by 50.9%and the bending moment increases by 37.9%after 100 days,which the elastic model would not have been able to predict. | Peng Huang Jixiong Zhang Xingjie Yan Anthony John Spencer Spearing Meng Li Shiwei Liu | 2021 | International Journal of Mining Science and Technology2021，31，2： | 8 |
| 6 | Regression model for civil aero-engine gas path parameter deviation based on deep domainadaptation with Res-BP neural network显示文摘The variations in gas path parameter deviations can fully reflect the healthy state of aeroengine gas path components and units;therefore,airlines usually take them as key parameters for monitoring the aero-engine gas path performance state and conducting fault diagnosis.In the past,the airlines could not obtain deviations autonomously.At present,a data-driven method based on an aero-engine dataset with a large sample size can be utilized to obtain the deviations.However,it is still difficult to utilize aero-engine datasets with small sample sizes to establish regression models for deviations based on deep neural networks.To obtain monitoring autonomy of each aero-engine model,it is crucial to transfer and reuse the relevant knowledge of deviation modelling learned from different aero-engine models.This paper adopts the Residual-Back Propagation Neural Network(Res-BPNN)to deeply extract high-level features and stacks multi-layer Multi-Kernel Maximum Mean Discrepancy(MK-MMD)adaptation layers to map the extracted high-level features to the Reproduce Kernel Hilbert Space(RKHS)for discrepancy measurement.To further reduce the distribution discrepancy of each aero-engine model,the method of maximizing domain-confusion loss based on an adversarial mechanism is introduced to make the features learned from different domains as close as possible,and then the learned features can be confused.Through the above methods,domain-invariant features can be extracted,and the optimal adaptation effect can be achieved.Finally,the effectiveness of the proposed method is verified by using cruise data from different civil aero-engine models and compared with other transfer learning algorithms. | Xingjie ZHOU Xuyun FU Minghang ZHAO Shisheng ZHONG | 2021 | Chinese Journal of Aeronautics2021，34，1： | 6 |
| 7 | Atg5 regulates late endosome and lysosome biogenesis显示文摘Autophagy is an evolutionarily conserved lysosome-based degradation process.Atg5 plays a very important role in autophagosome formation.Here we show that Atg5 is required for biogenesis of late endosomes and lysosomes in an autophagy-independent manner.In Atg5 cells,but not in other essential autophagy genes defecting cells,recycling and retrieval of late endosomal components from hybrid organelles are impaired,causing persistent hybrid organelles and defective formation of late endosomes and lysosomes.Defective retrieval of late endosomal components from hybrid organelles resulting from impaired recruitment of a component of V1-ATPase to acidic organelles blocks the pH-dependent retrieval of late endosomal components from hybrid organelles.Lowering the intracellular pH restores late endosome/lysosome biogenesis in Atg5 cells.Our data demonstrate an unexpected role of Atg5 and shed new light on late endosome and lysosome biogenesis. | PENG JunYa ZHANG Ran CUI YiTong LIU HaoDong ZHAO XiaoXin HUANG Lei HU MingXu YUAN XiaoXi MA BenYu MA XiaoWei TAKASHI Ueno MASAAKI Komatsu LIANG XingJie YU Li | 2014 | Science China(Life Sciences)2014，57，1： | 6 |
| 8 | Nanotechnology-based strategies for treatment of ocular disease显示文摘Ocular diseases include various anterior and posterior segment diseases. Due to the unique anatomy and physiology of the eye, efficient ocular drug delivery is a great challenge to researchers and pharmacologists. Although there are conventional noninvasive and invasive treatments, such as eye drops,injections and implants, the current treatments either suffer from low bioavailability or severe adverse ocular effects. Alternatively, the emerging nanoscience and nanotechnology are playing an important role in the development of novel strategies for ocular disease therapy. Various active molecules have been designed to associate with nanocarriers to overcome ocular barriers and intimately interact with specific ocular tissues. In this review, we highlight the recent attempts of nanotechnology-based systems for imaging and treating ocular diseases, such as corneal d iseases, glaucoma, retina diseases, and choroid diseases. Although additional work remains, the progress described herein may pave the way to new,highly effective and important ocular nanomedicines. | Yuhua Weng Juan Liu Shubin Jin Weisheng Guo Xingjie Liang Zhongbo Hu | 2017 | Acta Pharmaceutica Sinica B2017，7，3： | 6 |
| 9 | Optical meta-waveguides for integrated photonics and beyond显示文摘The growing maturity of nanofabrication has ushered massive sophisticated optical structures available on a photonic chip.The integration of subwavelength-structured metasurfaces and metamaterials on the canonical building block of optical waveguides is gradually reshaping the landscape of photonic integrated circuits,giving rise to numerous metawaveguides with unprecedented strength in controlling guided electromagnetic waves.Here,we review recent advances in meta-structured waveguides that synergize various functional subwavelength photonic architectures with diverse waveguide platforms,such as dielectric or plasmonic waveguides and optical fibers.Foundational results and representative applications are comprehensively summarized.Brief physical models with explicit design tutorials,either physical intuition-based design methods or computer algorithms-based inverse designs,are cataloged as well.We highlight how meta-optics can infuse new degrees of freedom to waveguide-based devices and systems,by enhancing light-matter interaction strength to drastically boost device performance,or offering a versatile designer media for manipulating light in nanoscale to enable novel functionalities.We further discuss current challenges and outline emerging opportunities of this vibrant field for various applications in photonic integrated circuits,biomedical sensing,artificial intelligence and beyond. | Yuan Meng Yizhen Chen Longhui Lu Yimin Ding Andrea Cusano Jonathan A.Fan Qiaomu Hu Kaiyuan Wang Zhenwei Xie Zhoutian Liu Yuanmu Yang Qiang Liu Mali Gong Qirong Xiao Shulin Sun Minming Zhang Xiaocong Yuan Xingjie Ni | 2021 | Light(Science & Applications)2021，10，12： | 6 |
| 10 | Genome editing in Drosophila melanogaster: from basic genome engineering to the multipurpose CRISPR-Cas9 system显示文摘Nowadays, genome editing tools are indispensable for studying gene function in order to increase our knowledge of biochemical processes and disease mechanisms. The extensive availability of mutagenesis and transgenesis tools make Drosophila melanogaster an excellent model organism for geneticists. Early mutagenesis tools relied on chemical or physical methods,ethyl methane sulfonate(EMS) and X-rays respectively, to randomly alter DNA at a nucleotide or chromosomal level. Since the discovery of transposable elements and the availability of the complete fly genome, specific genome editing tools, such as P-elements, zinc-finger nucleases(ZFNs) and transcription activator-like effector nucleases(TALENs), have undergone rapid development. Currently, one of the leading and most effective contemporary tools is the CRISPR-cas9 system made popular because of its low cost, effectiveness, specificity and simplicity of use. This review briefly addresses the most commonly used mutagenesis and transgenesis tools in Drosophila, followed by an in-depth review of the multipurpose CRISPR-Cas9 system and its current applications. | Xingjie Ren Kristof Holsteens Haiyi Li Jin Sun Yifan Zhang Lu-Ping Liu Qingfei Liu Jian-Quan Ni | 2017 | Science China(Life Sciences)2017，60，5： | 5 |
| 11 | Surface Amendments Can Ameliorate Subsoil Acidity in Tea Garden Soils of High-Rainfall Environments显示文摘强烈酸的土壤(pH < 5.0 ) 对茶(山茶 sinensis ) 有害生产和质量。很少信息都不在表面修正案的能力上存在改善在茶花园土壤的心土酸味。A 120-d 温室列沥滤实验用通常可得到的土壤改良物被进行。碱的炉渣(作为) 并且器官的残余,猪粪肥(下午) 和在灰碱度和 C/N 比率不同的油菜籽蛋糕(RC ) 独自并且在联合被合并到土壤列的表面(0-15 厘米)(10 厘米内部的直径 ×
50 厘米长) 从 Ultisol 的酸的土壤层(15-30 厘米) 与土壤收拾行李(起始的 pH = 4.4 ) 。在 120-d 实验期间,土壤列被浇(在 9 应用上的大约 127 公里) 根据长期的平均数,年度降雨(1 143 公里) 和 leachates 镇定、分析。在实验的结束,土壤列被划分成各种各样的深度,土壤的化学性质被测量。有更高的 C/N 比率的下午增加了心土 pH,而有更低的 C/N 比率的 RC 减少了心土 pH。然而,联合了有的修正案独自修正案比也减少心土酸味的一个极有能力。心土的 pH 的增加主要被归功于到减少的基础阳离子集中和在溶解的器官的碳(文档) 和从修改的层被沥滤在下面的硝酸盐的固定在场的器官的阴离子的分解。一重要(P < 0.05 ) 在碱度生产之间的关联(减少的可交换的酸味 -N 周期碱度) 并且碱度平衡(网碱度生产 -N 周期碱度) 在实验的结束被观察。另外,联合了显著地增加的修正案(P < 0.05 ) 心土阳离子集中和减少的心土艾尔浸透(P < 0.05 ) 。联合应用就象表面的器官的修正案,土壤在在高降雨的区域减少心土酸味是有效的。在地条件下面并且在更长的 timeframes 上的进一步的调查被需要充分在改善理解他们的实际有效性在自然地发生沥滤下面的更深的土壤层的酸味政体。 | WANG Lei Clayton R. BUTTERLY CHEN Qiuhui MU Zhibo WANG Xia XI Yunguan ZHANG Jibing XIAO Xingji | 2016 | Pedosphere2016，26，2： | 5 |
| 12 | Strength and deformation behaviors of veined marble specimens after vacuum heat treatment under conventional triaxial compression显示文摘The mechanical behaviors of rocks affected by high temperature and stress are generally believed to be significant for the stability of certain projects involving rocks, such as nuclear waste storage and geothermal resource exploitation. In this paper, veined marble specimens were treated to high temperature treatment and then used in conventional triaxial compression tests to investigate the effect of temperature, confining pressure, and vein angle on strength and deformation behaviors. The results show that the strength and deformation parameters of the veined marble specimens changed with the temperature, presenting a critical temperature of 600℃. The triaxial compression strength of a horizontal vein(β = 90°) is obviously larger than that of a vertical vein(β = 0°). The triaxial compression strength,elasticity modulus, and secant modulus have an approximately linear relation to the confining pressure. Finally,Mohr–Coulomb and Hoek–Brown criteria were respectively used to analyze the effect of confining pressure on triaxial compression strength. | Haijian Su Hongwen Jing Qian Yin Liyuan Yu Yingchao Wang Xingjie Wu | 2017 | Acta Mechanica Sinica2017，33，5： | 5 |
| 13 | Studies on the Epidemiology and Etiology of Moldy Sugarcane Poisoning in China显示文摘Mldy sugarcane poisoning,an acute fatal food poisoning of unknown etiology,has occurred in 13 provinces in China.The epidemiological characteristics and clinical features were described.Evidence,from laboratory studies indicates that 3-nitropropionic acid produced by the fungus Arthrinium Spp.is the etiological factor of this food poisoning. | LIU XINGJIE,LUO XUEYUN, HU WENJUANInstitute of Nutrition and Food Hygiene, Chinese Academy of Preventive Medicine, 29 Nan Wei Road, Beijing 100050, China Institute of Food Safety Control and Inspection, Ministry of Public Health, Panjiayao, Beijing 100021, China. | 1992 | Biomedical and Environmental Sciences1992，5，2： | 4 |
| 14 | Enhancement for φ-OTDR Performance by Using Narrow Linewidth Light Source and Signal Processing显示文摘以便基于阶段敏感的光时间域反射计提高一个分布式的声学的察觉到系统的 signal-to-noise-ratio (我们建议了的 -OTDR), 分割的 unwrapping 算法,阶段差别的平均评价,和过滤方法的无限的推动反应(IIR ) 的联合。信号质量的改进数字地被表明。而且,我们学习了影响在 -OTDR 表演上源于轻来源噪音。结果看了那在 -OTDR 系统使用的轻来源的线宽什么时候更狭窄,系统的表演更好。简言之,当更狭窄的线宽光来源被选择,平均评价阶段差别的方法被使用时,如此的一个 -OTDR 系统能获得高质量的使解调的信号。 | Meng ZHANG Song WANG Yuanwei ZHENG Yao YANG Xingjie SA Li ZHANG | 2016 | Photonic Sensors2016，6，1： | 3 |
| 15 | Camptothecin-based nanodrug delivery systems显示文摘The drug camptothecin has a wide range of antitumor effects in cancers including gastric cancer,rectal and colon cancer,liver cancer,and lung cancer.Camptothecin-based drugs inhibit topoisomerase 1(Topo 1),leading to destruction of DNA,and are currently being used as important chemotherapeutic agents in clinical antitumor treatment.However,the main obstacle associated with cancer therapy is represented by systemic toxicity of conventional anticancer drugs and their low accumulation at the tumor site.In addition,low bioavailability,poor water solubility,and other shortcomings hinder their anticancer activity.Different from traditional pharmaceutical preparations,nanotechnology-dependent nanopharmaceutical preparations have become one of the main strategies for different countries worldwide to overcome drug development problems.In this review,we summarized the current hotspots and discussed a variety of camptothecin-based nanodrugs for cancer therapy.We hope that through this review,more efficient drug delivery systems could be designed with potential applications in clinical cancer therapy. | Yan Wen Yingze Wang Xiaoli Liu Wei Zhang Xinhe Xiong Zhongxiao Han Xingjie Liang | 2017 | Cancer Biology & Medicine2017，14，4： | 3 |
| 16 | Individual-tree diameter growth model for Korean pine plantations based on optimized interpolation of meteorological variables显示文摘To explore the influence of meteorological variables on the growth of Korean pine(Pinus koraiensis Sieb.et Zucc.) plantations and provide a scientific reference for the production and management of Korean pine,three approaches to interpolate meteorological variables during the growing season(i.e.,May-September) were compared in Heilongjiang Province,China.Optimized meteorological variable interpolation results were then combined with stand and individual tree variables,based on data from 56 sample plots and 2886 sample trees from Korean pine plantations in two regions of the province to develop an individualtree diameter growth model(Model I) and an individualtree diameter growth model with meteorological variables(Model Ⅱ) using a stepwise regression method.Moreover,an individual-tree diameter growth model with regional effects(Model Ⅲ) was developed using dummy variables in the regression,and the significance of introducing these dummy variables was verified with an F-test statistical analysis.The models were validated using an independent data set,and the predictive performance of the three models was assessed via the adjusted coefficient of determination(R_(a)^(2)) and root mean square error(RMSE).The results suggest that the growth increment in tree diameter of Korean pine plantations was significantly correlated with the natural logarithm of initial diameter(ln D),stand basal area(BAS),logarithmic deformation of the stand density index(ln SDI),ratio of basal area of trees larger than the subject tree to their initial diameter at breast height(DBH)(BAL/D),and the maximum growingseason precipitation(Pgmax).The individual-tree diameter growth models of Korean pine plantations developed in this study will provide a good basis for estimating and predicting growth increments of Korean pine forests over larger areas. | Man Wang Yinghui Zhao Zhen Zhen Xingji Jin | 2021 | Journal of Forestry Research2021，32，4： | 3 |
| 17 | Design and synthesis of novel water-soluble amino acid derivatives of chlorin p6 ethers as photosensitizer显示文摘Eight new water-soluble amino acid conjugates 6 a-h of chlorin p6 ethers(5 a-d) were synthesized and preliminarily investigated for their in vitro PDT antitumor activity and structure-activity relationship(SAR). The results showed that all compounds exhibited much higher phototoxicity against tumor cells than talaporfin. SAR analysis indicated that PDT antitumor effect enhanced with the increase of carbon chain length of alkoxyl ether bonds at 3~1-position, and L-aspartic acid was superior to L-glutamic acid. In particular, the IC_50 values of most phototoxic compound 6 d were 0.20 mmol/L against A549 cell and0.41υmmol/L against B16-F10 cell, which individually represented 31-and 24-fold increase of antitumor potency compared to talaporfin, suggesting that it was a promising candidate photosensitizer(PS) for PDT applications due to its strong absorption at long wavelength, high phototoxicity, low dark cytotoxicity and good water-solubility. | Xingjie Zhang Zhi Meng Zhiqiang Ma Junhong Liu Guiyan Han Fujia Ma Ningyang Jia Zhenyuan Miao Wannian Zhang Chunquan Sheng Jianzhong Yao | 2019 | Chinese Chemical Letters2019，30，1： | 3 |
| 18 | Anti-NLRP3 inflammasome abietane diterpenoids from Callicarpa bodinieri and their structure elucidation显示文摘Callica rpabodinieri is a Chinese traditional medicine herb with anti-inflammatory activity in clinic.Herein,we report two new 9,10-seco and etherified abietane diterpenoids bodinieric acids J and K(1 and 2) and one known compound(3) isolated from the leaves and twigs of this plant.Their chemical structures were elucidated by detailed spectrometry data analysis and DP4+NMR calculation methods.Hypothetical biosynthetic pathways of 1-3 were preliminarily speculated.Compound 3 inhibited inflammasome activation and exhibited blockage of NLRP3 inflammasome activation at non-cytotoxic concentrations in vitro. | Junbo Gao Xingjie Zhang Kun Shang Weimao Zhong Ruihan Zhang Xiaochang Dai Xiaoli Li Qi Wang Yan Zou Weilie Xiao | 2020 | Chinese Chemical Letters2020，31，2： | 3 |
| 19 | Nonreciprocal metasurface with space-time phase modulation显示文摘Creating materials with time-variant properties is critical for breaking reciprocity that imposes fundamental limitations on wave propagation.However,it is challenging to realize efficient and ultrafast temporal modulation in a photonic system.Here,leveraging both spatial and temporal phase manipulation offered by an ultrathin nonlinear metasurface,we experimentally demonstrated nonreciprocal light reflection at wavelengths around 860 nm.The metasurface,with travelling-wave modulation upon nonlinear Kerr building blocks,creates spatial phase gradient and multi-terahertz temporal phase wobbling,which leads to unidirectional photonic transitions in both the momentum and energy spaces.We observed completely asymmetric reflections in forward and backward light propagations over a large bandwidth around 5.77 THz within a sub-wavelength interaction length of 150 nm.Our approach highlights a potential means for creating miniaturized and integratable nonreciprocal optical components. | Xuexue Guo Yimin Ding Yao Duan Xingjie Ni | 2019 | Light(Science & Applications)2019，8，1： | 3 |
| 20 | Formation and crystallization behavior of Fe-based amorphous precursors with pre-existingα-Fe nanoparticles-Structure and magnetic properties of high-Cu-content Fe-Si-B-Cu-Nb nanocrystalline alloys显示文摘Structure,crystallization behavior,and magnetic properties of as-quenched and annealed Fe_(81.3)Si_(4)O_(13)Cu_(1.7)(Cu1.7)alloy ribbons and effects of Nb alloying have been studied.Three-dimensional atom probe and transmission electron microscopy analyses reveal that high-number-density Cu-clusters and Pre-existing Nano-sized a-Fe Particles(PN-a-Fe)are coexistence in the melt-spun Cu1.7 amorphous matrix,and the PN-α-Fe form by manners of one-direction adjoining and enveloping the Cu-clusters.Two-step crystallization behavior associated with growth of the PN-a-Fe and subsequent nucleation and growth of newly-formedα-Fe is found in the primary crystallization stage of the Cu1.7 alloy.The number densities of the Cu-clusters and PN-a-Fe in melt-spun Fe8_(1.3-x)Si_(4)B_(13)Cu_(1.7)Nb_(x)alloys are gradually reduced with enriching of Nb,and a fully amorphous structure forms at 4 at.%Nb,although smaller Cu-clusters still exist.After annealing,2 at.%Nb coarsens the average size(D_(α-F)e)of theα-Fe grains from 14.0 nm of the Nb-free alloy to 21.6 nm,and 4 at.%Nb refines the D_(α-Fe)to 8.9 nm.The mechanisms of theα-Fe nucleation and growth during quenching and annealing for the alloys with large quantities of PN-α-Fe as well as after Nb alloying have been discussed,and an annealing-induced oc-Fe growth mechanism in term of the barrier co-contributed by competitive growth among the PN-a-Fe and diffusion-suppression effect of Nb atoms has been proposed.A coercivity(HC)αDα-Fe^(3)correlation has been found for the nanocrystalline alloys,and the permeability is inverse with the H_(C). | Yanhui Li Xingjie Jia Wei Zhang Yan Zhang Guoqiang Xie Zhiyong Qiu Junhua Luan Zengbao Jiao | 2021 | Journal of Materials Science & Technology2021，，6： | 3 |
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