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Tailoring microstructure and electrical transportation through tensile stress in Bi_(2)Te_(3) thermoelectric fibers

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Journal of Materiomics 2020年第3期6卷 467-475页

作者： Min Sun Guowu Tang Bowen Huang Zhongjia Chen Yu-Jun Zhao Hanfu Wang Ziwen Zhao Dongdan Chen Qi Qian zhongmin yang School of Physics and Optoelectronics South China University of TechnologyGuangzhou510640China State Key Laboratory of Luminescent Materials and Devices Institute of Optical Communication MaterialsGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesGuangdong Provincial Key Laboratory of Fiber Laser Material and Applied TechniquesSouth China University of TechnologyGuangzhou510640China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology of ChinaBeijing100190China Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai Institute for Advanced Communication and Data ScienceSchool of Communication and Information EngineeringShanghai UniversityShanghai200072China

Bismuth telluride(Bi_(2)Te_(3))has attracted much attention in the field of thermoelectrics since it is one kind of commercial room-temperature thermoelectric *** three kinds of Bi_(2)Te_(3) thermoelectric fibers with internal tensile stress are fabricated utilizing an optical fiber template *** effects of internal stress on the microstructure and the electrical transportation of Bi_(2)Te_(3) thermoelectric fibers are *** Bi_(2)Te_(3) cores in the fibers are highly crystalline and possess a tensile nanosheet structure with preferential orientation as evidenced by X-ray diffraction and Raman *** stress can enhance electrical properties of the *** a paper cup generator covered with 20 pieces of optimized fibers provides a μW-level output *** is inferred that tensile stress tuning can be an effective tool for the material optimization of thermoelectric performance.

关键词： Bi_(2)Te_(3) Thermoelectric fiber Tensile stress Electrical transportation

Transparent nanocrystal-in-glass composite fibers for multifunctional temperature and pressure sensing

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Fundamental Research 2024年第3期4卷 624-634页

作者： Qinpeng Chen Qiwen Pan Shiliang Kang Zhenlu Cai Shengda Ye Puxian Xiong zhongmin yang Jianrong Qiu Guoping Donga State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSchool of Materials Science and EngineeringSchool of Physics and OptoelectronicsSouth China University of TechnologyWushan Road 381Tianhe DistrictGuangzhou 510640China Laboratory of Infrared Materials and Devices the Research Institute of Advanced TechnologiesNingbo UniversityFenghua Road 818NingboJiangbei 315211China College of Optical Science and Engineering State Key Laboratory of Modern Optical InstrumentationZhejiang UniversityHangzhou 310027China

The pursuit of compact and integrated devices has stimulated a growing demand for multifunctional sensors with rapid and accurate responses to various physical parameters,either separately or *** fiber sensors have the advantages of robust stability,light weight,and compact geometry,enabling real-time and noninvasive signal detection by monitoring the fluorescence *** substantial progress in fluorescence sensors,achieving multifunctional sensing in a single optical fiber remains *** solve this problem,in this study,we present a bottom-up strategy to design and fabricate thermally drawn multifunctional fiber sensors by incorporating functional nanocrystals with temperature and pressure fluorescence responses into a transparent glass *** generate the desired nanocrystal-in-glass composite(NGC)fiber,the fluorescent activators,incorporated nanocrystals,glassy core materials,and cladding matrix are rationally *** the fluorescence intensity ratio technique,a self-calibrated fiber sensor is demonstrated,with a bi-functional response to temperature and *** temperature sensing,the NGC fiber exhibits temperature-dependent near-infrared emission at temperatures up to 573 K with a maximum absolute sensitivity of 0.019 K−1.A pressure-dependent upconversion emission is also realized in the visible spectral region,with a linear slope *** successful demonstration of multifunctional NGC fiber sensors provides an efficient pathway for new paradigms of multifunctional sensors as well as a versatile strategy for future hybrid fibers with novel combinations of magnetic,optical,and mechanical properties.

关键词： Fiber Nanocrystal-in-glass composite Nanocrystals Fluorescence detection Temperature-pressuresensing

High-efficiency and high-power single-frequency fiber laser at 1.6μm based on cascaded energy-transfer pumping

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Photonics Research 2020年第3期8卷 414-420页

作者： XIANCHAO GUAN QILAI ZHAO WEI LIN TIANYI TAN CHANGSHENG yang PENGFEI MA zhongmin yang SHANHUI XU School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials South China University of TechnologyGuangzhou 510640China Guangdong Engineering Technology Research and Development Center of High-performance Fiber Laser Techniques and Equipment Zhuhai 519031China Hengqin Firay Sci-Tech Company Ltd. Zhuhai 519031China Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of TechnologyGuangzhou 510640China Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices Guangzhou 510640China

In this paper,a technique combining the cascaded energy-transfer pumping(CEP)method and master-oscillator power-amplifier(MOPA)configuration is proposed for power scaling of 1.6-μm-band single-frequency fiber lasers(SFFLs),where the Er^(3+)ion has a limited *** CEP technique is fulfilled by coupling a primary signal light at 1.6μm and a C-band auxiliary *** numerical model of the fiber amplifier with the CEP technique reveals that the energy transfer process involves the pump competition and the in-band particle transition between the signal and auxiliary ***,for the signal emission,the population density in the upper level is enhanced,and the effective population inversion is achieved thanks to the CEP.A single-frequency MOPA laser at 1603 nm with an output power of 52.6 W and an improved slope efficiency of 30.4%is experimentally obtained through the CEP ***,a laser linewidth of 5.2 k Hz and a signal-to-auxiliary laser ratio of 60.7 d B are obtained at the maximum output *** proposed technique is anticipated to be promising for increasing the slope efficiency and power scaling for fiber lasers operating at L band.

关键词： fiber pumping power

Er^(3+)掺杂钡镓锗玻璃上转换荧光淬灭机理研究

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稀有金属材料与工程 2008年第1期37卷 80-84页

作者：肖凯杨中民华南理工大学特种功能材料及其制备新技术教育部重点实验室广东广州510640

制备了30BaO-30Ga2O3-40GeO2-xEr2O3系统玻璃,测量了Er3+在钡镓锗玻璃中的吸收光谱。分别采用488nm,800nm和980nm激发不同浓度Er3+掺杂的玻璃样品,测量了Er3+的4S3/2→4I15/2荧光光谱;并利用488nm脉冲氙灯激发,测量了Er3+的4S3/2→4I15/2荧光衰减,讨论了Er3+掺杂浓度对4S3/2能级发光强度和荧光寿命的影响。结果表明:随着Er3+浓度的增加,4S3/2→4I15/2荧光强度先增大后减小,在Er3+浓度为1%时出现峰值;而4S3/2能级的荧光寿命呈递减趋势,荧光衰减曲线的非指数成分增加。能量分析表明:Er3+的4S3/2能级和4I15/2能级之间交叉驰豫过程是上转换荧光淬灭的主要通道,而交叉驰豫过程主要源于Er3+电偶极-电偶极间的相互作用。

关键词： Er^3+掺杂钡镓锗玻璃荧光淬灭

Multi-functional bismuth-doped bioglasses: combining bioactivity and photothermal response for bone tumor treatment and tissue repair

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Light(Science & Applications) 2018年第1期7卷 1001-1013页

作者： Liping Wang Nicholas J.Long Lihua Li Yao Lu Mei Li Jiangkun Cao Yu Zhang Qinyuan Zhang Shanhui Xu zhongmin yang Chuanbin Mao Mingying Peng The State Key Laboratory of Luminescent Materials and Devices Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesGuangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSchool of Materials Science and EngineeringSouth China University of Technology510641 GuangzhouChina Department of Chemistry Imperial College LondonSouth KensingtonLondon SW72AZUK Guangdong Key Lab of Orthopedic Technology and Implant Materials Department of OrthopedicsGuangzhou General Hospital of Guangzhou Military Command111 Liuhua Road510010 GuangzhouChina Department of Chemistry and Biochemistry Stephenson Life Sciences Research Center University of OklahomaNormanOK 73072USA School of Materials Science and Engineering South China University of TechnologyGuangzhou 510641China

Treatment of large bone defects derived from bone tumor surgery is typically performed in multiple separate operations,such as hyperthermia to extinguish residual malignant cells or implanting bioactive materials to initiate apatite remineralization for tissue repair;it is very challenging to combine these functions into a ***,we report the first photothermal(PT)effect in bismuth(Bi)-doped *** the basis of this discovery,we have developed a new type of Bi-doped bioactive glass that integrates both functions,thus reducing the number of treatment *** demonstrate that Bi-doped bioglasses(BGs)provide high PT efficiency,potentially facilitating photoinduced hyperthermia and bioactivity to allow bone tissue *** PT effect of Bi-doped BGs can be effectively controlled by managing radiative and non-radiative processes of the active Bi species by quenching photoluminescence(PL)or depolymerizing glass *** vitro studies demonstrate that such glasses are biocompatible to tumor and normal cells and that they can promote osteogenic cell proliferation,differentiation,and *** illumination with near-infrared(NIR)light,the bioglass(BG)can efficiently kill bone tumor cells,as demonstrated via in vitro and in vivo *** indicates excellent potential for the integration of multiple functions within the new materials,which will aid in the development and application of novel biomaterials.

关键词： glasses bismuth treatment

应用电子计算机拟合麻风年龄患病专率的改进催化模型

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中华流行病学杂志 1989年第1期10卷 40-43页

作者：杨忠民中国医学科学院皮肤病研究所

本文通过电子计算机对江苏省八个地区麻风年龄患病专率的理论拟合，提出了适用于麻风年龄患病专率分布的改进催化模型及其变量代换公式，并对结果进行了分析探讨。作者认为，麻风年龄患病专率可以用改进的催化模型来模拟；它是一条S形... 详细信息

本文通过电子计算机对江苏省八个地区麻风年龄患病专率的理论拟合，提出了适用于麻风年龄患病专率分布的改进催化模型及其变量代换公式，并对结果进行了分析探讨。作者认为，麻风年龄患病专率可以用改进的催化模型来模拟；它是一条S形曲线，开始上升缓慢，然后快速上升，达到顶点后又缓慢下降；这反映了麻风病潜伏期和病期长、发病率低的特点。两级催化模型中的三个参数a、b、k，分别代表了疾病感染力、疾病消除速度和防治效果指数；可以应用催化模型对不同时期、不同地区的疾病年龄患病率拟合分析，对疾病的感染力。人群消除疾病的能力和防治效果进行综合评价。

关键词：催化模型麻风病年龄患病率

Surface Metallurgy of Nickle Base Superalloy

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International Journal of Minerals,Metallurgy and Materials 1999年第1期13卷 47-49页

作者： Xu Zhang zhongmin yang Jianxin Dong Xishan Xie Yuan Gao Zhong Xu (Material Science and Engineering school, University of Science and Technology Beijing, Beijing 100083, China)(Institute of Surface Engineering, Taiyuan University of Technology, Taiyua Material Science and Engineering School University of Science and Technology Beijing Beijing 100083 China Institute of Surface Engineering Taiyuan University of Technology Taiyuan 030024 China

The Double Glow Plasma Surface Alloying Technique, the Xu-Tee Process, is a new method to produce high quality alloying layer on the surface of less expensive materials. By using thes technique, the surface alloying layer similar to superalloy Inconel 625 has been obtained on the surface of three kinds of melallic materials (low carbon steel, industrial pure iron, stainless steel Cr18Ni9). The results of the composition and microstructure analyzed by Scanning Electron Microscopy (SEM) and X-Ray Uffrachon (XRD) show that the alloying layer consistS of y matrix and several precipitates (Laves intermetallic phase and carbide etc.). The electrochemical corrosion results show that the surface alloying layer formed on the surface of stainless steel and industrial pure iron have better corrosion resistance than that of nickel base alloy inconel 625 and stainless steel Cr18Ni9 in 3.5%NaCl solution. The exper iments indicate that it is an effective way to obtain the gradient surface alloying layer on the surfaces of steels by using Double Glow Plasma Surface Alloying Technique.

关键词： double glow nickel base alloy plasma surface alloying

Transparent glassy composites incorporating lead-free anti-perovskite halide nanocrystals enable tunable emission and ultrastable X-ray imaging

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Advanced Photonics 2023年第4期5卷 23-32页

作者： Yakun Le Xiongjian Huang Hao Zhang Zhihao Zhou Dandan yang Bozhao Yin Xiaofeng Liu Zhiguo Xia Jianrong Qiu zhongmin yang Guoping Dong South China University of Technology School of Materials Science and EngineeringState Key Laboratory of Luminescent Materials and DevicesGuangzhouChina South China University of Technology School of Physics and OptoelectronicsGuangzhouChina Zhejiang University School of Materials Science and EngineeringHangzhouChina Zhejiang University College of Optical Science and EngineeringState Key Laboratory of Modern Optical InstrumentationHangzhouChina

Lead halide perovskite materials exhibit excellent scintillation performance,which,however,suffer from serious stability and toxicity *** contrast,the heavy metal-free anti-perovskite materials[MX_(4)]XA_(3)(A=alkali metal;M=transition metal;X=Cl,Br,I),a class of electron-inverted perovskite derivatives,exhibit robust structural and photophysical ***,we design and prepare a lead-free[MnBr_(4)]BrCs_(3) anti-perovskite nanocrystal(NC)-embedded glass for efficient X-ray-excited luminescence with high-resolution X-ray imaging with a spatial resolution of 19.1 Ip mm^(-1).Due to the unique crystal structure and the protection of the glass matrix,the Cs_(3)MnBr_(5) NC-embedded glass exhibits excellent X-ray irradiation stability,thermal stability,and water *** merits enable the demonstration of real-time and durable X-ray radiography based on the developed glassy *** work could stimulate the research and development of novel metal halide anti-perovskite materials and open a new path for future development in the field of high-resolution and ultrastable X-ray imaging.

关键词： lead-free metal halides anti-perovskite nanocrystals glass ultrastable X-ray imaging

High-Power All-Polarization-Maintaining Fiber Femtosecond Pulse Laser at 780 nm and Its Engineering Integration(Invited)

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中国激光 2024年第19期51卷 207-214页

作者： Luo Tao Wen Junpeng Wang Wenlong Li Zihan Zhu Zhe yang Jiahao Wu Yin Xiu Hao Fan Yiheng Liu Yalong Wei Xiaoming yang zhongmin School of Physics and Optoelectronics State Key Laboratory of Luminescent Materials and DevicesGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DeviceGuangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of TechnologyGuangzhou 510640GuangdongChina Guangzhou yangming Laser Technology Co. Ltd.Guangzhou 510663GuangdongChina Research Institute of Future Technology South China Normal UniversityGuangzhou 510006GuangdongChina

We present a high-power, high-stability all-polarization-maintaining(all-PM) fiber femtosecond pulse laser source at 780 nm with full engineering integration that comprises an all-PM fiber amplified chirped pulse laser at 1560 nm, a grating pair compressor and a second-harmonic generation(SHG) module. The all-PM fiber amplified chirped pulse laser at 1560 nm operates with a repetition rate of 111.5 MHz and an average power of 5.37 W, which is compressed with a pulse width of about 204 fs. The 780-nm pulses are subsequently generated by SHG in a frequency-doubling crystal. We achieve an average power of 2.22 W at 780 nm with a pulse width of 288 fs, a SHG efficiency of 52%, and a root-mean-square power fluctuation of 0.23%, which is the best performance merit as far as we know. The whole laser system is finally integrated for practical applications with reliable laser operation. We anticipate that this 780-nm all-PM fiber femtosecond pulse laser with full engineering integration is promising for frontier applications such as two-photon imaging, nanofabrication, terahertz generation, etc.

关键词： lasers femtosecond pulse high power fiber laser second-harmonic generation