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Enabling efficient NIR-II luminescence in lithium-sublattice core–shell nanocrystals towards Stark sublevel based nanothermometry

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Nano Research 2023年第1期16卷 1626-1633页

作者： Songbin Liu Zhengce An Jinshu huang bo Zhou National Rare Earth Functional Material Innovation Center Key Laboratory of Rare Earth Luminescence Materials and Devices of Jiangxi ProvinceCollege of Rare EarthsJiangxi University of Science and TechnologyGanzhou 341000China State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of TechnologyGuangzhou 510641China

The luminescence in the second near-infrared(NIR-II)spectral region(1,000–1,700 nm)has recently attracted great attention for emerging biological applications owing to its merit of deep tissue bioimaging and high spatiotemporal ***,it still remains a challenge to achieve the highly efficient NIR-II emissions of lanthanides in ***,we report an ideal design of sensitizing lithium sublattice core–shell nanocrystals for efficient NIR-II emission properties from a set of lanthanide emitters including Er3+,Tm3+,Ho3+,Pr3+,and Nd3+.In particular,the typical NIR-II emission of Er3+at 1.5μm was greatly enhanced by further manipulating the energy transfer via Er3+–Ce3+cross-relaxation,and the quantum yield can reach up to 35.74%under 980 nm excitation(12.5 W·cm−2),which is the highest value to the best of our *** 808 nm responsive efficient NIR-II emission was also enabled at the single-particle level through rational core–shell–shell structure ***,the lithium-sublattice provides an obvious spectral Stark-splitting feature,which can be used in the ultrasensitive NIR-II nanothermometer with relative sensitivity of 0.248%K−1 and excellent thermal cycling *** results open a door to the research of new kinds of efficient NIR-II luminescent materials,showing great promise in various frontier fields such as deep tissue nanothermometry and in vivo bioimaging.

关键词： NIR-II lanthanides core-shell nanostructure Stark splitting nanothermometry

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All-solid-state pseudocapacitive micro-supercapacitors from laser-treated polymer derivatives

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Chinese Chemical Letters 2018年第4期29卷 596-598页

作者： Zhi huang bo Yuan College of Power Engineering Chongqing University Chongqing 400044 China School of Energy & Environmental Engineering University of Science & Technology Beijing Beijing 400044 China

We report a simple method for fabricating all-solid-state micro-supercapacitors, utilizing laser writing technology. Porous graphene films with three-dimensional networks induced by laser from commercial polymer was acted as scaffold for loading MnO2, a typical pseudocapacitive materials. Using gel electrolyte, all-solid-state pseudocapacitive micro-supercapacitors were fabricated. Compare to traditional printing and lithography techniques produced micro-supercapacitors, the as-fabricated devices demonstrate high volumetric capacitances, good stability and low leakage current, indicating a scalable and facile approach for future energy storage devices in portable microelectronics.

关键词： Micro-supercapacitors All-solid-state Laser technology Pseudocapacitive Microelectronics

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甲烷在ZnO表面反应制合成气的微观机理研究

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原子与分子物理学报 2025年第6期42卷 1-9页

作者：黄琼谊楼波丁佳欣王水安华南理工大学电力学院广州510640

利用密度泛函(DFT)和过渡态理论对甲烷分子在ZnO表面的微观反应过程进行第一性原理研究,通过建立ZnO表面的吸附模型,计算了吸附能、过渡态参数和态密度,探讨了甲烷分子在氧化锌晶体表面H解离以及H_(2)和CO的生成过程,结果表明:CH_(4)在Z... 详细信息

利用密度泛函(DFT)和过渡态理论对甲烷分子在ZnO表面的微观反应过程进行第一性原理研究,通过建立ZnO表面的吸附模型,计算了吸附能、过渡态参数和态密度,探讨了甲烷分子在氧化锌晶体表面H解离以及H_(2)和CO的生成过程,结果表明:CH_(4)在ZnO(010)表面的最佳吸附位点为Zn位,吸附能为-4.65 kcal/mol,甲烷在氧化锌ZnO(010)面四次解离H(反应动力学上最有利路径)所需克服的能垒分别为38.6 kcal/mol、90.8 kcal/mol、53.2 kcal/mol和35.8 kcal/mol,其中甲烷第二次解离H_(2)过程能垒最高,是反应过程的决速步,降低该基元反应的活化能是关键,而-OH的形成抑制了-CH_(3)的解离.氧空位的形成增加活性位点的数量与提高位点的活性.甲烷与氧化锌表面的反应有两次H_(2)生成反应,第一次生成H_(2)的反应难度较大.

关键词：化学链重整甲烷反应机理密度泛函理论过渡态

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Surface available gravitational potential energy in the world oceans

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Acta Oceanologica Sinica 2022年第4期41卷 40-56页

作者： Ruixin huang bo Qiu Zhiyou Jing State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Woods Hole Oceanographic Institution Woods HoleMA 02543USA Department of Oceanography University of Hawaii at ManoaHonoluluHI 96822USA

Satellite altimetry observations,including the upcoming Surface Water and Ocean Topography mission,provide snapshots of the global sea surface high anomaly *** common practice in analyzing these surface elevation data is to convert them into surface velocity based on the geostrophic *** increasing horizontal resolution in satellite observations,sea surface elevation data will contain many dynamical signals other than the geostrophic velocity.A new physical quantity,the available surface potential energy,is conceptually introduced in this study defined as the density multiplied by half of the squared deviation from the local mean reference surface *** gravitational potential energy is an intrinsic property of the sea surface height field and it is an important component of ocean circulation energetics,especially near the sea *** connection with other energetic terms,this new variable may help us better understand the dynamics of oceanic circulation,in particular the processes in connection with the free surface data collected through satellite *** preliminary application of this concept to the numerically generated monthly mean Global Ocean Data Assimilation System data and Archiving,Validation,and Interpretation of Satellite Oceanographic altimeter data shows that the available surface potential energy is potentially linked to other dynamic variables,such as the total kinetic energy,eddy kinetic energy and available potential energy.

关键词： satellite altimetry surface available potential energy eddy kinetic energy

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Linear-quadratic optimal control for time-varying descriptor systems via space decompositions

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The Journal of China Universities of Posts and Telecommunications 2023年第6期30卷 38-48页

作者： LüPengchao huang Junjie Liu bo School of Mathematical Sciences Inner Mongolia UniversityHohhot 010021China Ministry of Education Key Laboratory for Intelligent Analysis and Security Governance of Ethnic Languages Minzu University of ChinaBeijing 100081China

This paper aims at solving the linear-quadratic optimal control problems(LQOCP)for time-varying descriptor systems in a real Hilbert *** using the Moore-Penrose inverse theory and space decomposition technique,the descriptor system can be rewritten as a new differential-algebraic equation(DAE),and then some novel sufficient conditions for the solvability of LQOCP are ***,the methods proposed in this work are simpler and easier to verify and compute,and can solve LQOCP without the range inclusion *** addition,some numerical examples are shown to verify the results obtained.

关键词： linear-quadratic optimal control problem(LQOCP) time-varying descriptor system Moore-Penrose inverse space decomposition

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Spatial and temporal classification of synthetic satellite imagery:land cover mapping and accuracy validation

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Geo-Spatial Information Science 2014年第1期17卷 1-7页

作者： Yong XU bo huang Department of Geography and Resource Management The Chinese University of Hong KongShatinN.T.Hong KongChina

This study focused on land cover mapping based on synthetic images,especially using the method of spatial and temporal classification as well as the accuracy validation of their *** experimental results indicate that the accuracy of land cover map based on synthetic imagery and actual observation has a similar standard compared with actual land cover survey *** findings facilitate land cover mapping with synthetic data in the area where actual observation is ***,in order to improve the quality of the land cover mapping,this research employed the spatial and temporal Markov random field classification *** results show that overall mapping accuracy can be increased by approximately 5% after applying spatial and temporal *** finding contributes towards the achievement of higher quality land cover mapping of areas with missing data by using spatial and temporal information.

关键词： land cover mapping synthetic data spatial and temporal classification

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Nanotwining induced by tensile fatigue and dynamic impact of laser powder bed fusion additively manufactured CoCrFeNi high-entropy alloy

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Journal of Materials Science & Technology 2024年第16期183卷 241-257页

作者： Guoqing huang bo Li Yinan Chen Fuzhen Xuan School of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China Additive Manufacturing and Intelligent Equipment Research Institute East China University of Science and TechnologyShanghai 200237China Shanghai Collaborative Innovation Center for High-end Equipment Reliability Shanghai 200237China

The laser powder bed fusion(L-PBF)additively manufactured CoCrFeNi high-entropy alloy(HEA),with face-centered cubic(FCC)crystal structure,demonstrates better comprehensive mechanical properties in the building direction(BD).Loading quasi-static,dynamic fatigue,and dynamic separated Hopkinson press bar(SHPB)impact stress conditions along the BD of the L-PBF processed HEA exhibit intriguing mi-crostructural evolution *** L-PBF generates hierarchical dislocation grids containing nu-merous cell substructures within the HEA FCC grains,impeding dislocation motion during deformation and improving the *** subjected to dynamic fatigue loading,the dislocation grids restrict the mean free path of dislocations and thus trigger the activation of abundant stacking ***,nu-merous nanotwins form near the end of the fatigue *** twinning systems can also be activated under dynamic high-speed impact *** at a low temperature of 77 K,the stacking fault energy of the CoCrFeNi HEA decreases,resulting in increased activation of nanotwins,exhibiting excep-tional toughness and resistance to dynamic *** twin boundaries also impede dislocation movement for the strain *** findings hold valuable implications for the study of additively manufactured HEA parts working in extreme environments.

关键词： High-entropy alloy Nanotwins Fatigue Impact behavior Additive manufacturing

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Non-noble metal-based bifunctional electrocatalysts for hydrogen production

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Rare Metals 2022年第7期41卷 2169-2183页

作者： Tong Wu Ming-Zi Sun bo-Long huang Department of Applied Biology and Chemical Technology the Hong Kong Polytechnic UniversityHong Kong 999077China

Hydrogen is a promising candidate for clean and sustainable energy resources to substitute fossil fuels to mitigate global environmental *** hydrogen production has been regarded as a viable and promising *** overall water splitting is currently the predominant electrochemical hydrogen production method,which could be driven by renewable energy to achieve sustainable ***,the current challenges are the intrinsically sluggish and energy-intensive oxygen evolution reduction(OER)at the anode and the expensive noble metal-based catalysts for overall water splitting,which limit the practical *** efforts have been made to develop bifunctional non-noble metal-based electrocatalysts to boost hydrogen production efficiency and lower the ***,alternative oxidation reactions with faster kinetics and less energy requirement than OER are being explored as the anodic reaction to couple with the hydrogen evolution reaction for energy-saving hydrogen *** this review,the non-noble metal-based bifunctional electrocatalysts for overall water splitting,as well as other novel energy-saving hydrogen productions have been introduced and *** challenges and outlooks are commented on at the end of the article.

关键词： Overall water splitting Hydrogen production Bifunctional electrocatalyst Energy-saving hydrogen production Non-noble metal electrocatalysts

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Grain-size effect on dislocation source-limited hardening and ductilization in bulk pure Ni

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Journal of Materials Science & Technology 2023年第23期154卷 9-21页

作者： Kai Hu Jun Yi bo huang Gang Wang Institute of Materials School of Materials Science and Engineering Shanghai University Shanghai 200444 China

Dislocation source-limited hardening and ductilization is an effective strategy to obtain superior strength-ductility synergy in some engineering structural metals. Recent works demonstrated that the synergy could be enhanced by grain-size reduction. However, the mechanism of grain-size dependence is still a mystery. In this work, bulk pure Ni produced by electrodeposition and subsequent annealing, with grain sizes ranging from ∼20 nm to ∼20 µm, were methodically investigated to unravel the mechanism of the grain-size effect on dislocation source-limited hardening and ductilization. The high-density nano-twinning in the as-electrodeposited nanograined specimens exhibited better thermodynamic stability than the peers with random high-angle grain boundaries, leading to fine recrystallized grains with low-density dislocations. The low dislocation density enabled extra hardening beyond grain boundary strengthening via yield-point behavior with grain sizes ranging from ∼110 nm to ∼10 µm and extra ductilization over ∼500 nm. This work demonstrated that the prerequisite for dislocation source-limited hardening was that the dislocation density of the specimen should be lower than the size-dependent critical value of ((1.1 × 107 /d ) m^(–2), d is the grain size in unit of the meter) where a transition from forest-dominated hardening to dislocation source-limited hardening could occur. On the other hand, dislocation source-limited ductilization only worked when the grain size was comparable to/larger than the theoretical dislocation mean slip distance. Dislocation source-limited ductilization resulted from more room in grains for accumulation of dislocations and deformation nano-stacking faults enabling the higher work hardening rate. This work offered an altogether new avenue to obtain stronger and more ductile metallic materials through utilizing grain-size dependent dislocation source-limited hardening and ductilization.

关键词： Dislocation source-limited hardening Dislocation source-limited ductilization Grain size Yield point Hall-Petch slope

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Distribution of Reference Stations: Initial Explore on the Optimal Selection Strategy

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Chinese Journal of Electronics 2021年第4期30卷 752-758页

作者： BAO Junjie LI Rui SHAO bo huang Zhigang School of Electronic and Information Engineering Beihang University The 20th Research Institute of China Electronics Technology Group Corporation

The Satellite-based augmentation system(SBAS) is intended to provide real-time differential global navigation satellite system corrections with the high accuracy, availability, and integrity required for aviation applications. Since the performance of Satellite clock and ephemeris(SCE) corrections and Ionospheric range delay(IRD) corrections can vary dramatically depending on satellites and Ground reference stations(GRSs) geometry,therefore, we present a GRSs distribution optimized criteria and process to improve SBAS corrections *** present step-by-step optimized scheme using the average satellite surveillance dilution of precision and relative centroid metric availability of grid points as fitness values to determine the appropriate GRSs distribution to sufficiently meet the corrections requirements. The results show that the statistical mean RCM availability can reach more than 0.5518 for all IGPs and the coverage depth of GRSs in China and its surrounding areas is more than 25,which fully satisfies the requirement for solving SCE and IRD corrections.

关键词： Ground reference stations distribution Satellite surveillance dilution of precision Relative centroid metric Clock and ephemeris corrections Ionospheric corrections

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