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Monolayer tungsten disulfide in photonic environment:Angleresolved weak and strong light-matter coupling

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Nano Research 2022年第6期15卷 5619-5625页

作者： Xuewen Zhang Lishu Wu Xu Wang Silin He hanwei Hu Guangchao Shi Xingwang Zhang Jingzhi Shang Ting Yu Institute of Flexible Electronics(IFE) Northwestern Polytechnical University(NPU)Xi’an 710129China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhou 215123China School of Physics and Technology Wuhan UniversityWuhan 430072China

Light-matter interactions in two-dimensional transition metal dichalcogenides(TMDs)are sensitive to the surrounding dielectric *** on the interacting strength,weak and strong exciton–photon coupling effects can occur when the exciton energy is resonant with the one of *** we report angle-resolved spectroscopic signatures of monolayer tungsten disulfide(1L-WS2)in weak and strong exciton–photon coupling *** optical response of 1L-WS_(2)in the momentum space is uncovered by employing a dielectric mirror as substrate,where the energy dispersion is angleindependent while the amplitudes increase at high detection *** 1L-WS_(2)sits on top of a dielectric layer on silicon,the resonant trapped photon weakly couples with the exciton,in which the minimum of reflection dip shifts at both sides of the crossing angle while the emitted exciton energy remains *** unusual shift of reflection dip is attributed to the presence of Fano resonance under white-light *** embedding 1L-WS_(2)into a dielectric microcavity,strong exciton–photon coupling results in the formation of lower and upper polariton branches with an appreciable Rabi splitting of 34 meV at room temperature,where the observed blueshift of the lower polariton branch is indicative of the enhanced polaritonpolariton *** findings highlight the effect of dielectric environment on angle-resolved optical response of exciton–photon interactions in a two-dimensional semiconductor,which is helpful to develop practical TMD-based architectures for photonic and polaritonic applications.

关键词： light-matter coupling Fano resonance Rabi splitting exciton-polariton dielectric effect

高功率光纤激光器反常模式不稳定效应实验研究

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中国激光 2024年第6期51卷 1-8页

作者：曾令筏文榆钧王小林王鹏奚小明杨保来张汉伟习锋杰韩凯王泽锋许晓军国防科技大学前沿交叉学科学院湖南长沙410073 国防科技大学南湖之光实验室湖南长沙410073 国防科技大学高能激光技术湖南省重点实验室湖南长沙410073

模式不稳定是限制当前高功率光纤激光器功率提升的主要因素。在近单模光纤激光器中,一般采用减小光纤弯曲直径的方法增加高阶模损耗、提升模式不稳定阈值;然而,少模光纤激光器中存在多个高阶模式,会导致动态模式不稳定(TMI)阈值随着弯... 详细信息

模式不稳定是限制当前高功率光纤激光器功率提升的主要因素。在近单模光纤激光器中,一般采用减小光纤弯曲直径的方法增加高阶模损耗、提升模式不稳定阈值;然而,少模光纤激光器中存在多个高阶模式,会导致动态模式不稳定(TMI)阈值随着弯曲直径减小而降低的反常模式不稳定现象。基于纤芯/包层直径为30/600μm的双包层掺镱光纤以及具有不同直径的光纤水冷柱,设计了一台后向泵浦的高功率光纤放大器,研究了该激光器中的反常模式不稳定现象。结果表明:当采用中心波长为976 nm的稳波长激光二极管(LD)作为泵浦源时,随着增益光纤弯曲直径由13 cm增加至16 cm,激光器的TMI阈值由1650 W提升至3740 W,提升幅度约为1.27倍,输出激光的相对亮度提升了87%。光纤弯曲直径的增加虽然会带来输出激光光束质量的轻微退化,但输出激光的相对亮度能够大幅提升。最终,结合光纤弯曲以及泵浦波长优化,实现了7.1 kW高亮度光纤激光输出,相对亮度为1293。

关键词：光纤光学光纤放大器反常模式不稳定光纤弯曲泵浦波长优化

Broad-spectrum and powerful neutralization of bacterial toxins by erythroliposomes with the help of macrophage uptake and degradation

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Acta Pharmaceutica Sinica B 2022年第11期12卷 4235-4248页

作者： Chunying Liu Shuangrong Ruan Ying He Xuejing Li Yuefei Zhu Honglan Wang hanwei Huang Zhiqing Pang School of Pharmacy Fudan UniversityKey Laboratory of Smart Drug DeliveryMinistry of EducationShanghai 201203China The Institute for Biomedical Engineering&Nano Science Tongji University School of MedicineShanghai 200092China Department of Biomedical Engineering Columbia UniversityNew YorkNY 10027USA Institute of Hematology Union HospitalTongji Medical CollegeHuazhong University of Science&TechnologyWuhan 430022China

Anti virulence strategy has been considered as one of the most promising approaches to combat drug-rcesistant bacterial ***-forming toxins(PFTs)are the largest class of bacterial toxins,inficting their virulence ffect through creating pores on the cell ***,curent solutions for eliminating PFTs are mostly designed based on their molecular structure,requiring customized design for different *** the present study,we employed erythroliposome(denoted as RM-PL),a biomimetic platform constructed by artificial lipid membranes and natural erythrocyle membranes,to necutralize different hemolytic PFTs regardless of their molecular *** tested with model PFTs,including a-hemolysin,listeriolysin O,and streptolysin O,RM-PL could completely inhibit toxin-induced hemolysis in a concentration-dependent *** vivo studies further confirmed that *** eficiently neuralize various toxins and save animals'lives without causing damage to 0rgans or *** addition,we explored the underlying mechanisms of this efficient detoxification ability and found that it was mainly macrophages in the spleen and the liver that took up RM-PL-absorbed toxins through a variety of endocytosis pathways and digested them in *** summary,the biomimetic RM-PL presented a promising system for broad-spectrum and powerful toxin neutralization with a mech-anism of lysosome-mediaed loxin degradation.

关键词： Eythroliposome Broad-spectrum detoxifcation Hybrid nanovesicle Pore-forming toxins Macrophage uptake Red blood cell membrane Atificial lipid membrane

Probing angle-resolved reflection signatures of intralayer and interlayer excitons in monolayer and bilayer MoS_(2)

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Nano Research 2023年第5期16卷 7844-7850页

作者： hanwei Hu Xuewen Zhang Xinyu Zhang Lishu Wu Vanessa Li Zhang Silin He Guangchao Shi Ting Yu Jingzhi Shang Institute of Flexible Electronics Northwestern Polytechnical UniversityXi’an 710129China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore School of Physics and Technology Wuhan UniversityWuhan 430072China

Strongly bound excitons in atomically thin transition metal dichalcogenides offer many opportunities to reveal the underlying physics of basic quasiparticles and many-body effects in the two-dimensional(2D)*** reflection investigation on band-edge exciton transitions is essential to exploring wealthy light–matter interactions in the emerging 2D semiconductors,whereas angle-resolved reflection(ARR)characteristics of intralayer and interlayer excitons in 2D MoS_(2)layers remain ***,we report ARR spectroscopic features of A,B,interlayer excitons in monolayer(ML)and bilayer(BL)MoS_(2)on three kinds of photonic substrates,involving distinct exciton–photon *** a BL MoS_(2)on a protected silver mirror,the interlayer exciton with one-third amplitude of A exciton appears at 0.05 eV above the A exciton energy,exhibiting an angleinsensitive energy *** ML and BL MoS_(2)lie on a SiO_(2)-covered silicon,the broad trapped-photon mode weakly couples with the reflection bands of A and B excitons by the Fano resonance effect,causing the asymmetric lineshapes and the redshifted *** transferring MoS_(2)layers onto a one-dimensional photonic crystal,two high-lying branches of B-exciton polaritons are formed by the interactions between B excitons and Bragg photons,beyond the weak-coupling *** work provides ARR spectral benchmarks of A,B,interlayer excitons in ML and BL MoS_(2),gaining insights into the interpretation of light–matter interactions in 2D semiconductors and the design of their devices for practical photonic applications.

关键词： MoS_(2) exciton exciton–photon coupling exciton–polariton angle-resolved reflection

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星载视频SAR模式设计与数据处理

信号处理 2024年第1期40卷 207-215页

作者：孙晗伟肖枫景茂强何德华张过祖家国于松柏张庆君肖汉北京无线电测量研究所北京100854 武汉大学测绘遥感信息工程国家重点实验室湖北武汉430079 中国空间技术研究院遥感卫星总体部北京100094

视频SAR可实现对重点区域持续观测并以视频方式呈现出来,其高帧率成像特性有利于对地面/海面机动目标的实时探测,视频SAR及其相关技术作为一种新颖的SAR观测模式成为近年的研究热点。从合成孔径原理出发,SAR载频越高,方位调频率绝对值越... 详细信息

视频SAR可实现对重点区域持续观测并以视频方式呈现出来,其高帧率成像特性有利于对地面/海面机动目标的实时探测,视频SAR及其相关技术作为一种新颖的SAR观测模式成为近年的研究热点。从合成孔径原理出发,SAR载频越高,方位调频率绝对值越大,实现相同分辨率的合成孔径时间越短,越有利于视频的生成,因此通过合理的系统设计,Ka频段星载SAR具备视频工作的能力。然而星载SAR作用距离远,实现视频观测的几何模型、波位设计方案与机载SAR存在较大差异;此外,星载视频SAR幅宽较大,数据量和处理计算量需求巨大,如何快速实现数据处理是保证图像获取及后续应用时效性必须考虑的问题。本文基于珞珈二号(Luojia-2)SAR载荷和实测数据开展了相关研究,首先基于珞珈二号SAR卫星轨道以及平台能力设计了可实际应用的视频模式波位,其次基于时域成像算法提出了一种适合于星载视频SAR快速成像的流水线处理流程,最后基于珞珈二号实测数据完成了视频SAR成像处理。实测数据处理结果表明所提成像处理流程方法适合于星载视频SAR处理快速成像,可高效完成珞珈二号视频SAR实测数据处理。

关键词：视频SAR 星载SAR 珞珈二号

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钒钛矿烧结生产的研究进展

烧结球团 2024年第3期49卷 1-9页

作者：邢汉威姜鑫张付林纪恒靳亚涛隋孝利沈峰满东北大学冶金学院辽宁沈阳110819 鞍钢股份有限公司炼钢总厂辽宁鞍山114021 河钢股份有限公司承德分公司河北承德067101 东北大学多金属共生矿生态化冶金教育部重点实验室辽宁沈阳110819

本文归纳了钒钛矿的烧结特点,分析了钒钛烧结矿强度差、低温还原粉化现象严重的主要原因,介绍了增加铁酸钙黏结相量、控制燃料配比、控制烧结温度、配加褐铁矿、强化制粒、复合造块及烧结矿表面喷洒CaCl_(2)/B_(2)O_(3)溶液等能够改善... 详细信息

本文归纳了钒钛矿的烧结特点,分析了钒钛烧结矿强度差、低温还原粉化现象严重的主要原因,介绍了增加铁酸钙黏结相量、控制燃料配比、控制烧结温度、配加褐铁矿、强化制粒、复合造块及烧结矿表面喷洒CaCl_(2)/B_(2)O_(3)溶液等能够改善钒钛矿烧结指标的技术措施,展望了钢铁企业钒钛矿强化烧结面临的问题及解决方案。

关键词：钒钛烧结矿钙钛矿褐铁矿含硼矿物转鼓强度

Kilowatt-level supercontinuum generation in a single-stage random fiber laser with a half-open cavity

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High Power Laser Science and Engineering 2023年第6期11卷 139-145页

作者： Li Jiang Jinming Wu Rui Song Zilun Chen Xiran Zhu Fengchang Li Kailong Li hanwei Zhang Jing Hou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangshaChina Nanhu Laser Laboratory National University of Defense TechnologyChangshaChina Hunan Provincial Key Laboratory of High Energy Laser Technology National University of Defense TechnologyChangshaChina

The random distributed-feedback fiber laser(RFL) is a new approach to obtain a high-power stable supercontinuum(SC) *** consider both structure simplification and high-power SC output,an innovative structure achieving a kilowatt-level SC output in a single-stage RFL with a half-open cavity is demonstrated in this *** consists of a fiber oscillator,a piece of long passive fiber and a broadband coupler,among which the broadband coupler acting as a feedback device is crucial in SC *** the system has no feedback,the backward output power is up to298 W under the pump power of 1185 *** the feedback is introduced before the pump laser,the backward power loss can be reduced and the pump can be fully utilized,which could promote forward output power and conversion efficiency *** the maximum pump power of 1847 W,a 1300 W SC with spectrum ranging from 887 to1920 nm and SC conversion efficiency of 66% is *** the best of our knowledge,it is the simplest structure used for high-power SC generation,and both the generated SC output power and the conversion efficiency are highest in the scheme of the half-opened RFL output SC.

关键词： high conversion efficiency high-power supercontinuum random fiber laser single-stage structure

等离子喷涂高强韧纳米TiO_(2)涂层的制备及其力学性能

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热喷涂技术 2024年第2期16卷 99-105,112页

作者：马凤孝郭星晔何翰伟吴旭周正贺定勇北京工业大学材料科学工程学院北京100124 北京市生态环境材料及其评价工程技术研究中心北京100124

为提高大气等离子喷涂(APS)TiO_(2)陶瓷涂层的结合强度及其摩擦磨损性能,采用喷雾造粒的纳米结构TiO_(2)粉末为原料,利用APS工艺制备出TiO_(2)陶瓷涂层,研究了涂层的显微组织、相组成、力学性能和摩擦磨损性能,并与常见的微米级TiO_(2)... 详细信息

为提高大气等离子喷涂(APS)TiO_(2)陶瓷涂层的结合强度及其摩擦磨损性能,采用喷雾造粒的纳米结构TiO_(2)粉末为原料,利用APS工艺制备出TiO_(2)陶瓷涂层,研究了涂层的显微组织、相组成、力学性能和摩擦磨损性能,并与常见的微米级TiO_(2)粉末制备的陶瓷涂层组织性能进行了对比。结果表明,微米TiO_(2)粉在喷涂前后相成分从板钛矿变为金红石和锐钛矿的混合相;而纳米团聚的TiO_(2)粉喷涂前后无明显的相成分变化,均以金红石相为主。纳米TiO_(2)涂层的孔隙率为1.4%,低于微米粉涂层的3.3%。纳米TiO_(2)涂层的力学性能优于微米涂层,微米涂层硬度为934.2 HV_(0.1),而纳米涂层的硬度为1349 HV_(0.1);纳米和微米涂层的弹性模量分别为203.1和185.8 GPa;纳米涂层的断裂韧性为2.1 MPa·m^(1/2),略高于微米涂层的2.0 MPa·m^(1/2);纳米涂层的结合强度可达46.8 MPa,是微米涂层的3.18倍(14.7 MPa)。此外,在相同的摩擦条件下,纳米TiO_(2)涂层的摩擦因数为0.69,比微米TiO_(2)涂层更低,纳米涂层的磨损体积也比微米涂层更少。综合来说,纳米TiO_(2)涂层相对于微米级TiO_(2)涂层体现出更好的综合力学性能。

关键词：等离子喷涂纳米TiO_(2)涂层力学性能摩擦学性能

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灵龟八法抗衰老机制的研究进展

广西医学 2024年第1期46卷 134-138页

作者：赵一平范郁山莫亚茹陈翰巍芮靖琳广西中医药大学针灸推拿学院广西南宁市530001

衰老是一种在年龄增长过程中,以形态变化、功能障碍和代谢紊乱为特征的综合状态。从古至今,人们不断地在追寻健康长寿的方法,抗衰老机理的研究一直备受关注。灵龟八法是一种根据时辰取穴的方法,将八脉交会穴、九宫、干支相结合,在多种... 详细信息

衰老是一种在年龄增长过程中,以形态变化、功能障碍和代谢紊乱为特征的综合状态。从古至今,人们不断地在追寻健康长寿的方法,抗衰老机理的研究一直备受关注。灵龟八法是一种根据时辰取穴的方法,将八脉交会穴、九宫、干支相结合,在多种疾病的治疗中疗效显著,且取穴较少。研究发现,灵龟八法对延缓衰老、提高机体免疫力具有显著效果。本文结合近十几年来灵龟八法抗衰老的相关文献,对灵龟八法抗衰老的相关机制进行综述,旨在为抗衰老研究提供更多的思路。

关键词：灵龟八法衰老机制综述