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Solvent-controlled synthesis strategy of multicolor emission carbon dots and its applications in sensing and light-emitting devices

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Nano Research 2022年第1期15卷 414-422页

作者： zhonghui Sun Fanyong Yan jing Xu Hao zhang Li Chen State Key Laboratory of Separation Membranes and Membrane Processes School of Chemistry and Chemical EngineeringTiangong UniversityTianjin 300387China

Carbon dots(CDs),as a new kind of carbon-based luminescent nanomaterials,have drawn widespread attention in the fields of fluorescence sensing,optoelectronic devices,and biological *** work uses citric acid(CA)and Nile Blue A(NBA)as *** simply changing the solvent in the reaction,their bandgaps were systematically controlled,thereby successfully obtaining bright blue,yellow and red fluorescence emission CDs(B-,Y-and RCDs).The higher quantum yield(QY)of B-,Y-and RCDs are 64%,57%and 51%,*** selected precursors and different solvents are the key to the formation of three emission *** characterization and density functional theory(DFT)calculations further indicate that the difference in emission color of CDs is due to the size of the sp^(2) conjugate *** addition,we used multicolor CDs as fluorescent probes to investigate their performance in *** them,BCDs and YCDs can detect Sudan Red I with high selectivity and *** the concentration range of 0 to 80 pM,the detection limits are 56 and 41 nM,*** emitting phosphors and fluorescent films are also obtained by mixing CDs with other *** Ultraviolet(UV)chip as the excitation source and combining with multicolor fluorescent film and a certain proportion of B-,Y-,and RCDs/epoxy resin composites,bright monochromatic light-emitting diodes(LEDs)and white LED(WLED)with high color rendering index(CRI)were *** above results indicate that the multicolor CDs prepared by us have great application potential in the fields of food safety control and optical devices.

关键词： carbon dots solvents tunable emission Sudan Red I phosphor light-emitting diodes

Plant-leaf-inspired MXene-silk composite for intelligent solar steam generation combined with mechanical actuation

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Nano Research 2023年第5期16卷 7792-7800页

作者： Yongqiang Qian zhiling Luo Yi Wang Wei zhang Luzhuo Chen Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials College of Physics and EnergyFujian Normal UniversityFuzhou 350117China Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering Fuzhou 350117China Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage Fuzhou 350117China

Solar steam generators based on photothermal materials are important in producing fresh ***,conventional solar steam generators are difficult to self-adapt to the complex external environment as ***,inspired by the plant leaf,we propose a photothermal composite based on MXene and silk to add more *** one hand,the composite achieves an evaporation rate of 1.51 kg·m^(−2)·h^(−1)and a conversion efficiency of 86.9%under a solar intensity of 1 kW·m^(−2),mimicking the water transpiration of plant *** the other hand,the MXene-silk-based actuator shows a maximum bending curvature of 0.91 cm^(−1)under a solar intensity of 5 kW·m^(−2).Furthermore,an intelligent solar system is constructed utilizing the synergy of solar steam generator and actuator,which advances the research from the material level to the system *** the behavior of plant leaf,the system can automatically open during the day to generate steam and fresh *** at night or in bad weather,it will automatically close to prevent external pollution such as dust,achieving intelligent *** research will have good application prospects in less developed ***,it also provides a certain reference value for exploring multi-functional photothermal devices in the future.

关键词： MXene silk solar steam generator photothermal actuator multi-functional

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中医导引术在绝经前后诸证中的应用研究

世界中医药 2024年第5期19卷 662-665页

作者：贾凡代金刚陈彤郁悦赵红玉朱诗琴张娜娜张武凡王超颖刘新敏无锡市中医医院无锡214071 中国中医科学院广安门医院北京100053 中国中医科学院医学实验中心北京100700 北京中医药大学北京100029

中医导引术采用形体运动、呼吸吐纳、精神调节相结合的方法,从精、气、神对人体进行调节,具有调整机体阴阳状态、防病治病、延年益寿等作用。绝经前后诸证,是指妇女在围绝经期,出现烘热汗出、面红潮热、烦躁易怒、手足心热、耳鸣心悸、... 详细信息

中医导引术采用形体运动、呼吸吐纳、精神调节相结合的方法,从精、气、神对人体进行调节,具有调整机体阴阳状态、防病治病、延年益寿等作用。绝经前后诸证,是指妇女在围绝经期,出现烘热汗出、面红潮热、烦躁易怒、手足心热、耳鸣心悸、头晕目眩、失眠健忘、精神倦怠、腰背酸痛、月经紊乱等症状,对围绝经期女性的生理和心理均有不良影响。中医导引术是绝经前后诸证的中医特色治疗方法,不仅可以改善围绝经期女性的局部身体症状,还有助于调节机体气血、脏腑、阴阳,使机体达到整体相对平衡的状态。

关键词：中医导引法绝经前后诸证围绝经期疾病治疗养生康复调身调息调神

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Polarization-insensitive plasmon nanofocusing with broadband interference modulation for optical nanoimaging

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Nano Research 2023年第7期16卷 9990-9996页

作者： Shaobo Li Fei Wang ze zhang Shuhao zhao Chengsheng Xia Peirui ji Xiaomin Wang Guofeng zhang Tao Liu Feng Chen Shuming Yang State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China School of Electronic Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China

Delivering light to the nanoscale using a flexible and easily integrated fiber platform holds potential in various fields of quantum science and ***,rigorous optical alignment,sophisticated fabrication process,and low spatial resolution of the fiber-based nanoconcentrators limit the practical ***,a broadband azimuthal plasmon interference nanofocusing technique on a fiber-coupled spiral tip is demonstrated for fiber-based near-field optical *** spiral plasmonic fiber tip fabricated through a robust and reproducible process can reverse the polarization and modulate the mode field of the surface plasmon polaritons in three-dimensionally azimuthal direction,resulting in polarization-insensitive,broad-bandwidth,and azimuthal interference *** integrating this with a basic scanning near-field optical microscopy,a high optical resolution of 31 nm and beyond is *** high performance and the easy incorporation with various existing measurement platforms offered by this fiber-based nanofocusing technique have great potential in near-field optics,tip-enhanced Raman spectroscopy,nonlinear spectroscopy,and quantum sensing.

关键词： azimuthal asymmetries plasmonic nanoconcentrator fiber-based plasmonic tip near-field scanning optical microscopy

Observer-Based Intra-Cluster Lag Consensus of Multi-Agent Systems via Intermittent Adaptive Pinning Control

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系统科学与复杂性学报:英文版 2023年第5期36卷 1809-1829页

作者： zhang Yunlong WEN Guoguang RAHMANI Ahmed PENG zhaoxia WEN Shiping CRIStAL UMR CNRS 9189Centrale LilleVilleneuve d'Ascq 59651France Department of Mathematics Beijing Jiaotong UniversityBeijing 100044China School of Transportation Science and Engineering Beihang UniversityBeijing 100191China Centre for Artificial Intelligence(CAI) University of Technology SydneyAustralia

The intra-cluster lag consensus means that the agents in the same cluster can achieve lag consensus asymptotically while the agents in different clusters can achieve different *** this paper,the authors investigate the observer-based intra-cluster lag consensus problems of multi-agent systems(MASs)with general linear dynamics and nonlinear dynamics via intermittent adaptive pinning *** interaction network is considered to be weakly connected,i.e.,it is not necessary to be strongly connected,in-degree balanced or contain a directed spanning *** realise the intra-cluster lag consensus,a class of observers is designed to estimate the states of *** a class of observer-based intermittent adaptive pinning control protocols is proposed according to the difference that the agents receive information ***,the pinning gains are designed to be intermittent adaptive and have an exponential convergence rate,which will effectively reduce communication costs,avoid the pinning gains being larger than those needed in real applications and guarantee the pinning gains quickly converge to steady ***,some sufficient consensus criteria are derived and rigorous proofs are given based on matrix theory and Lyapunov stability ***,the effectiveness for the proposed intermittent adaptive pinning control strategy is validated by a numerical simulation.

关键词： Lag consensus multi-agent systems intermittent adaptive pinning control state observer

Giant Magneto-impedance Effect in Composite Wires with Different Core Layer

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Nano-Micro Letters 2013年第2期5卷 140-144页

作者： R.L.Wang X.Li X.H.Kong Y.X.Guo j.z.Ruan z.j.zhao Department of Physics Engineering Research Center for Nanophotonics & Advanced Instrument Ministry of Education East China Normal University Experimental Teaching Center of Physics Shanghai Ocean University

Composite structure materials were potential sensing elements for magnetic sensors due to Giant magnetoimpedance(GMI) effect. Two kinds of composite wires with different magnetic/non-magnetic structures were fabricated by using electroless deposition methods and the magnetoimpedance properties were investigated. The maximum GMI ratio of 114% was acquired at 60 MHz in the composite wires with a ferromagnetic core, whereas, 116% of maximum GMI ratio was found in the composite wires with a conductive core at low frequency of 600 k Hz. These results exhibit that the GMI ratio reaches the maximum when magnetoresistance ratio ?R/R and magnetoinductance ratio ?X/X make the comparative contributions to the total magnetoimpedance(MI). The obvious GMI effect obtained in the composite wires with conductive core frequency may provide a candidate for applications in magnetic sensors, especially at low frequencies.

关键词： Composite wires Electroless deposition Giant Magnetoimpedance effect Resistivity

内河航道板桩-浆砌块石结构共同护岸机理研究

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岩土工程学报 2024年第S1期46卷 222-227页

作者：杨立功张宇亭李建东赵跃吴文华交通运输部天津水运工程科学研究院天津300456 港口水工建筑技术国家工程研究中心天津300456 湖州市港航管理中心浙江湖州313000

在内河高等级航道建设中,新建板桩-原有浆砌块石共同护岸成为一种新型的护岸结构。通过对该护岸结构的离心模型试验研究,分析了板桩与原有结构之间无连接(j1)、刚性连接(j2)时,原有护岸结构位移、板桩桩侧土压力及桩身弯矩。试验结果表... 详细信息

在内河高等级航道建设中,新建板桩-原有浆砌块石共同护岸成为一种新型的护岸结构。通过对该护岸结构的离心模型试验研究,分析了板桩与原有结构之间无连接(j1)、刚性连接(j2)时,原有护岸结构位移、板桩桩侧土压力及桩身弯矩。试验结果表明,刚性连接时,原有结构后倾、下沉位移远小于无连接情况,板桩稳定性大幅度提升;开挖过程中j1,j2条件下板桩除了产生平移位移、还有转动位移,j1以转动为主,j2以平移为主;受U型板桩形状影响,开挖过程中板桩两侧土体形成土拱,同一深度不同位置板桩土压力有较大区别,土压力变化也有较大差异;开挖过程中,j2条件下桩身范围内土压力变化较一致,j1条件下随桩身深度增加,桩侧土压力变化幅度增加;j1条件下最大弯矩位于桩身下部、j2条件下位于桩身上部,且j2最大弯矩大于j1最大弯矩。

关键词：板桩浆砌块石护岸土压力土拱效应离心模型试验

基于耦合辐射模型的太阳能集热器倾角优化研究

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可再生能源 2024年第7期42卷 894-900页

作者：王恩宇王天生张学友沈海笑黄运兴河北工业大学能源与环境工程学院天津300401

为了使太阳能集热器获得更多的太阳辐射量,须对集热器倾角进行优化。文章在建立倾斜面太阳辐射计算模型的基础上,分别优化直接辐射、散射辐射的计算过程。以太阳能集热器运行期间倾斜面接收最大辐射量为求解目标,借助MATLAB对集热器倾... 详细信息

为了使太阳能集热器获得更多的太阳辐射量,须对集热器倾角进行优化。文章在建立倾斜面太阳辐射计算模型的基础上,分别优化直接辐射、散射辐射的计算过程。以太阳能集热器运行期间倾斜面接收最大辐射量为求解目标,借助MATLAB对集热器倾角进行优化分析,得到月度最佳倾角和年度最佳倾角。其中天津地区的太阳能集热器年度最佳倾角为36.3°,比当地纬度略小;月度最佳倾角为10~64°,表现为夏季小冬季大的特点。相较于水平放置,在年度最佳倾角和月度最佳倾角下,太阳能集热器接收的年太阳辐射量可分别增加12.4%,17.3%;相较当地纬度作为倾角时,以月度最佳倾角值逐月调整接收的太阳辐射量可增加5.0%。分别以广州、拉萨、济南和长春为例,计算得到上述地区的年、月最佳倾角。对不同地区进行对比分析发现,直接辐射占比较高的地区逐月改变最佳倾角可获得更高的能量增益。

关键词：太阳辐射模型集热器最佳倾角设计优化

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Tuning the near room temperature oxidation behavior of highentropy alloy nanoparticles

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Nano Research 2022年第4期15卷 3569-3574页

作者： jing Gao jun Ding Yin zhang Ting zhu Qian Yu Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Center for Alloy Innovation and Design State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an 710049China Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

Understanding the oxidation behavior of high-entropy alloys(HEAs)is essential to their practical *** we conducted in situ environmental transmission electron microscopy(E-TEM)observations of dynamic oxidation processes in CrMnFeCoNi and CrFeCoNiPd nanoparticles(NPs)near room *** the oxidation of CrMnFeCoNi NPs,a favorable oxidation product was MnCr_(2)O_(4)with the spinel *** surface nanoislands of MnCr_(2)O_(4)underwent dynamic reconstruction,resulting in the thickened oxide layer with less *** CrFeCoNiPd NPs,the reactive element Mn was replaced by the inert element *** a result,a favorable oxide product was CrO_(2)with the rutile ***_(2)formed on the NP surface and was a result of Cr outward diffusion through the oxide *** addition,FeO nanocrystals formed at the oxide/metal interface and were a result of O inward diffusion through the oxide *** also performed first principles calculations to provide insights into the energetics and diffusion rates related to oxide *** results reveal the non-equilibrium processes of oxidation in HEA NPs that can be strongly influenced by small particle sizes and large surface *** work underscores the high tunability of oxidation behavior in nanoscale HEAs by changing their constituent alloying elements.

关键词： In situ transmission electron microscopy(TEM) high-entropy alloy(HEA)nanoparticles(NPs) oxidation