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Science China Chemistry 2025年第01期 297-307页

作者： Bin Fang Limin Wang Haoqin Li Jiaxin Zhang Yang Ding Pan Pan Li Bo Peng Hua Bai Lin Li Frontiers Science Center for Flexible Electronics Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials &Engineering Northwestern Polytechnical University institute of Flexible Electronics (IFE Future Technologies) Xiamen University

Hepatic ischemia-reperfusion injury（HIRI） is characterized by mitochondrial dysfunction and oxidative stress. Monitoring mitochondrial hydrogen peroxide（mtH2O2） levels in real-time through super-resolution imaging is crucial for elucidating its distribution in live cells and its mechanism of action during HIRI. However, low-background fluorogenic probes have been overlooked in the context of super-resolution imaging. In this study, we developed a low-background fluorogenic probe（MitoWG） with the potential for super-resolution morphology-correlated mitochondrial identification to track the fluctuates of mtH2O2in HIRI. Activation of the desirable fluorescence properties of the probe by mtH2O2was confirmed using structural illumination microscopy（SIM）, enabling high-quality mitochondrial imaging with exceptional specificity and *** in mtH2O2levels were successfully observed in both cellular and rat models of HIRI. Furthermore, we associated the decline in mitochondrial redox homeostasis with accelerated mtH2O2production during HIRI, which triggered mitophagy deficiency and led to cell death. In conclusion, Mito-WG possesses excellent photophysical and low-background properties for SIM imaging, making it a promising tool for mtH2O2tracking in HIRI research and clinical diagnosis.

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Machine Learning Techniques in Predicting Hot Deformation Behavior of Metallic Materials

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 713-732页

作者： Petr Opela Josef Walek Jaromír Kopecek Department of Metallurgical technologies Faculty of Materials Science and TechnologyVSB–Technical University of OstravaOstrava70800Czech Republic FZU—institute of Physics of the Czech Academy of Sciences Prague18200Czech Republic

In engineering practice,it is often necessary to determine functional relationships between dependent and independent *** relationships can be highly nonlinear,and classical regression approaches cannot always provide sufficiently reliable ***,Machine Learning(ML)techniques,which offer advanced regression tools to address complicated engineering issues,have been developed and widely *** study investigates the selected ML techniques to evaluate their suitability for application in the hot deformation behavior of metallic *** ML-based regression methods of Artificial Neural Networks(ANNs),Support Vector Machine(SVM),Decision Tree Regression(DTR),and Gaussian Process Regression(GPR)are applied to mathematically describe hot flow stress curve datasets acquired experimentally for a medium-carbon *** the GPR method has not been used for such a regression task before,the results showed that its performance is the most favorable and practically unrivaled;neither the ANN method nor the other studied ML techniques provide such precise results of the solved regression analysis.

关键词： Machine learning Gaussian process regression artificial neural networks support vector machine hot deformation behavior

Metal-organic frameworks with dinuclear metal centers for synergistically boosting CO2 photoreduction

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Science China Chemistry 2025年第01期 201-208页

作者： Hui-Feng Wang Wen-Jie Shi Yu-Xin Yang Bao-Xia Dong Tong-Bu Lu Di-Chang Zhong School of Chemistry and Chemical Engineering Yangzhou University institute for New Energy Materials and Low Carbon technologies School of Materials Science and Engineering Tianjin University of Technology

Dinuclear metal synergistic catalysis （DMSC） has been proved powerful in boosting CO2reduction,while this has not been achieved in heterogeneous catalysts with long-range order *** this study,we,by introduction of metal catalytic centers into an indium-based metal-organic framework （MOF）,obtained a series of isostructural In-MOFs,including three MOFs with mononuclear metal catalytic center （M-In）,three MOFs with dinuclear homometallic catalytic centers （MM-In）,and three MOFs with dinuclear heterometallic catalytic centers (MM’-In,M/M’=Co（II）,Ni（II）,Zn（II）).It was found that all these MOFs can serve as catalysts for photochemical CO2reduction to *** with M-In,the catalytic activities of MM-In were obviously enhanced,and that of MM’-In was further significantly *** example,the CO yield of Co Zn-In reaches a record value of 12,700μmol g-1h-1,which is 4.0,8.1,9.4,and 18.6-fold higher than that of Co Co-In,Zn Zn-In,Co-In,and Zn-In,***,the catalytic activities of Co Ni-In and Ni Zn-In also show different fold increase than those of corresponding dinuclear homometallic and mononuclear metallic *** results of control experiments and theoretical calculation reveal that the higher catalytic activities of MM-In over M-In can be ascribed to the DMSC effect,and the higher catalytic activity of MM’-In over MM-In can be ascribed to the strengthened DMSC *** work reveals the relationship between DMSC effect and bimetal centers in CO2reduction,which provides new insights into the DMSC and paves a new way to design highly active catalysts for photochemical CO2reduction.

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Influence of stretch and temperature on the energy density of dielectric elastomer generators

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Applied Mathematics and Mechanics(English Edition) 2019年第11期40卷 1547-1560页

作者： H.KHAJEHSAEID H.BAGHSHOMAL AZAR School of Engineering-emerging technologies University of Tabriz

Application of dielectric elastomers (DE) has remarkably increased in mechatronics because they are suitable candidates for energy harvesting due to their low cost,light weight,and high energy *** dielectric elastomer generators (DEGs) exhibit high performance regardless of the applications ***,functioning as a generator,a DE may lose its efficiency due to several failure modes including material rupture,loss of tension (LT),electrical breakdown (EB),and electromechanical instability (EMI).The failure modes confine the area of allowable states for generation *** constant and dielectric strength of such elastomers depend on the amount of applied deformation and also working temperature,which are often ignored in theoretical *** this paper,variations of the above-mentioned parameters are considered in mechanical and electrical modellings to investigate their effects on energy density and efficiency of *** results show that,ignoring the variations of material dielectric constant and dielectric strength leads to overestimation of the specific ***,it is shown that,for an acrylic-based generator,the specific energy sharply decreases with temperature rise.

关键词： renewable energy dielectric elastomer generator (DEG) stretch temperature

Bimetallic Single‑Atom Catalysts for Water Splitting

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Nano-Micro Letters 2025年第1期17卷 1-45页

作者： Megha A.Deshmukh Aristides Bakandritsos Radek Zbořil Nanotechnology Centre Centre for Energy and Environmental TechnologiesVŠB–Technical University of Ostrava17.listopadu 2172/1570800 Ostrava‑PorubaCzech Republic Regional Centre of Advanced technologies and Materials Czech Advanced Technology and Research Institute(CATRIN)Palacky University OlomoucŠlechtitelů241/2778371 Olomouc–HoliceCzech Republic

Green hydrogen from water splitting has emerged as a critical energy vector with the potential to spearhead the global transition to a fossil fuel-independent *** field of catalysis has been revolutionized by single-atom catalysts(SACs),which exhibit unique and intricate interactions between atomically dispersed metal atoms and their ***,bimetallic SACs(bimSACs)have garnered significant attention for leveraging the synergistic functions of two metal ions coordinated on appropriately designed *** offer an avenue for rich metal–metal and metal–support cooperativity,potentially addressing current limitations of SACs in effectively furnishing transformations which involve synchronous proton–electron exchanges,substrate activation with reversible redox cycles,simultaneous multi-electron transfer,regulation of spin states,tuning of electronic properties,and cyclic transition states with low activation *** review aims to encapsulate the growing advancements in bimSACs,with an emphasis on their pivotal role in hydrogen generation via water *** subsequently delve into advanced experimental methodologies for the elaborate characterization of SACs,elucidate their electronic properties,and discuss their local coordination ***,we present comprehensive discussion on the deployment of bimSACs in both hydrogen evolution reaction and oxygen evolution reaction,the two half-reactions of the water electrolysis process.

关键词： Single-atom catalysts Single-atom dimers Hydrogen evolution Oxygen evolution Water splitting

Development of micro-and nanorobotics: A review

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Science China(Technological Sciences) 2019年第1期62卷 1-20页

作者： YANG Jia ZHANG Chuang WANG XiaoDong WANG WenXue XI Ning LIU LianQing State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences University of Chinese Academy of Sciences emerging technologies institute Department of Industrial & Manufacturing Systems Engineering University of Hong Kong

Micro-and nanorobotic is an emerging field of research arising from the cross-fusion of micro/nano technology and robotics and has become an important part of robotics. Micro-and nanorobots have the advantages of small size, low weight, large thrust-toweight ratio, high flexibility, and high sensitivity. Due to the characteristics distinguishing from macroscopic robots, micro-and nanorobots have stimulated the research interest of the scientific community and opened up numerous application fields such as drug delivery and disease diagnosis. In the past 30 years, research on micro-and nanorobots has made considerable *** article provides a comprehensive overview of the development of these robots. First, the application of the robots is reviewed. Then, the key components of the robots are discussed separately, covering their actuation, design, fabrication and control. In addition, from the perspectives of intelligence and sensing, clinical applications, materials and performance, the challenges that may be encountered in the development of such robots in the future are discussed. Finally, the entire article is summarized, and concepts for future micro-and nanorobots are described.

关键词： micro-and nanorobots magnetic actuation manipulation biohybrid robot

Enhanced fatigue resistance of ferroelectric Al0.65Sc0.35N deposited by physical vapor deposition

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Science China(Information Sciences) 2024年第5期67卷 335-336页

作者： Yang LI Danyang YAO Yan LIU Zhi JIANG Ruiqing WANG Xu RAN Jiuren ZHOU Qikun WANG Guoqiang WU Genquan HAN School of Microelectronics Xidian University Hangzhou institute of Technology Xidian University Ultratrend technologies Inc. emerging Device and Chip Laboratory Institute of Technological Sciences Wuhan University

Aluminum scandium nitride(AlScN), a Ⅲ-Ⅴ ternary semiconductor, has been recognized as an innovative and promising ferroelectric material in emerging research. Among the characteristics of ferroelectric material, fatigue resistance is a critical measure of the endurance of ferroelectric films and represents an inherent challenge in the pursuit of practical applications.

关键词： Physical vapor deposition

Broadrange tunable slow and fast light in quantum dot photonic crystal structure

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Chinese Physics B 2017年第12期26卷 283-289页

作者： Alireza Lotfian Reza Yadipour Hamed Baghban Department of Electrical and Computer Engineering University of Tabriz Tabriz *** Iran School of Engineering-emerging technologies University of Tabriz Tabriz *** Iran

Slow and fast light processes, based on both structural and material dispersions, are realized in a wide tuning range in this article. Coherent population oscillations （CPO） in electrically tunable quantum dot semiconductor optical amplifiers lead to a variable group index ranging from the background index （nbgd） to^30. A photonic crystal waveguide is then dispersion engineered and a group index of 260 with the normalized delay-bandwidth product （NDBP） of 0.65 is achieved in the proposed waveguide. Using comprehensive numerical simulations, we show that a considerable enhancement of slow light effect can be achieved by combining both the material and the structural dispersions in the proposed active QDPCW structure. We compare our developed FDTD results with analytical results and show that there is good agreement between the results, which demonstrates that the proposed electrically-tunable slow light idea is obtainable in the QDPCW structure. We achieve a total group index in a wide tuning range from nbgd to^1500 at the operation bandwidth, which shows a significant enhancement compared with the schemes based only on material or structural dispersions. The tuning range and also NDBP of the slow light scheme are much larger than those of the electrically tunable CPO process.

关键词： photonic crystal quantum dot slow light semiconductor optical amplifier

用于太阳光光催化降解溴化乙锭的高活性锆掺杂锐钛矿型二氧化钛催化剂的制备和表征(英文)

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催化学报 2011年第5期32卷 789-794页

作者： S.SWETHA R.GEETHA BALAKRISHNA Nanobiosciences Center for Emerging TechnologiesJain University

Ethidium bromide is a fluorescent tag and is used in biomedical *** is a potent mutagen because of its DNA intercalating nature.A catalyst composition for the feasible elimination of ethidium bromide using a broad spectrum of solar radiation was *** anatase TiO2 was synthesized by gel to crystalline conversion and its bandgap was engineered by doping with zirconium to effectively harness *** doped nanocrystals were characterized by X-ray diffraction,scanning electron microscopy,transmission electron microscopy,energy dispersive X-ray analysis,and UV-Vis *** formed crystals retained the anatase phase with a marginal increase in *** pulverization process used to dope Zr into titania resulted in a nano and doped lattice with an increased and extended light absorption range,which gave a nearly five-fold increase in photoactivity over pure *** catalytic effect of the modified titania,the dopant concentration,and the dynamics of the dopant concentration on the charge carriers(trapping-recombination)for the degradation of the mutagen was *** modified titania is capable of total ethidium bromide elimination in *** loss of its mutagenic property was confirmed by an Ames *** induced revertant colonies observed were nil in the treated sample indicating a complete loss of the intercalating property of the mutagen.

关键词： sunlight titania zirconium ethidium bromide elimination

Drivers of Portfolio Flows into Chinese Debt Securities Amidst China's Bond Market Development

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China Finance and Economic Review 2024年第3期13卷 64-82页

作者： Tuuli McCully Bank of Finland-institute for emerging Economies

The paper focuses on China's onshore bond market and the drivers of non-resident net portfolio flows into Chinese debt *** a review of China's bond market,a simple theoretical model of push and pull factors driving bond fiows is *** represents a foundation for the empirical analysis on drivers of bond flows into *** and time-varying models are estimated to explain the importance of push and pull factors in China's bond *** China-specific pull factors,such as domestic economic growth and asset returns,are important drivers of flows,the results reveal that global push factors,such as US interest rates and risk aversion,have recently gained significance as drivers of flows into *** results confirm China's continued bond market deepening and integration with the rest of the world,which may have financial stability ***,increased awareness regarding bond market developments in China is warranted.

关键词： capital flows financial openness portfolio flows pull factors push factors