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Metal-support interaction controlled migration and coalescence of supported particles

Science China(Technological Sciences) 2019年第5期62卷 762-772页

作者： hu SuLei LI wei-Xue Department of Chemical Physics School of Chemistry and Materials ScienceiCHeMCAS Excellence Center for NanoscienceUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China

The particle migration and coalescence(PMC) kinetics of a supported metal are the main deactivation mechanisms restricting the successful industrialization of nanoparticles, but the theoretical insights regarding these kinetics are lacking. One key issue is the lack of a physical model to predict the effects of metal-support interaction(MSI) on PMC kinetics. In this paper, we report a theoretical study of PMC kinetics and their dependence on MSI. A new particle diffusion model is proposed based on the surface premelting hypothesis that considers the contact angle of a hemispherical particle on the support. Enhanced MSI suppresses PMC by increasing the radius of curvature and the interfacial adhesion energy, even though the accompanying reduction in the geometry factor partially promotes PMC kinetics. The increased surface energy increases the chemical potential of the atoms in the particle, which is conducive to PMC; an increased surface energy also results in enhanced MSI, which suppresses PMC. The competition between these two contradictory effects leads to a critical contact angle where the surface energy has no influence on the diffusion and resulting PMC kinetics. The proposed diffusion theory mode lincluding the effects of the support and the corresponding kinetic simulations, shed light onto the support-dependence of PMC kinetics and provide a foundation for further optimization and design of supported particles with better stability.

关键词： particle migration and coalescence metal-support interaction supported particles diffusion coefficient Smoluchowski

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Investigation of mechanical and electrical characteristics of selfsensing pneumatic torsional actuators

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Science China(Technological Sciences) 2024年第1期67卷 130-142页

作者： XIAO wei hu DeAn hu GuoLiang XIAO Yihua Key Laboratory of Conveyance and Equipment Ministry of EducationEast China Jiaotong UniversityNanchang 330013China Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of EducationHunan UniversityChangsha 410082China

Soft pneumatic actuators are one of the most promising actuation for soft robots,and great achievements have been *** it remains challenging to endow sensing capabilities to pneumatic actuators,especially for the sensing ability originating directly from the actuator ***,a self-sensing pneumatic torsional actuator(SPTA)is designed based on the electromagnetic induction effect and magnetically responsive *** SPTA can generate feedback voltage and current with the deformation,in which the sensing function comes from its inherent *** investigate the mechanical and electrical characteristics,an experimental platform and a finite element model are established,*** find that the torsion angle and output torque increase in nonlinear with the actuating *** maximum torsion angle is 66.35°,which is 84.34%of that for the actuator fabricated by pure *** maximum output torque(24.9 N mm)improves by 23.19%compared with the actuator made by pure *** regards the electrical characteristics,the maximum feedback voltage and current are 2.90μV and 29.50 nA when the SPTA is actuated by a pressure of−40 *** also demonstrate that the relationship between the torsion angle and the magnetic flux change is approximately ***,the number of turns of wires,magnetic powders contents,and magnetic direction on the feedback voltage and current are *** show that the feedback voltage and current can be enhanced by increasing the number of turns and magnetic powders *** envision that the SPTA would be promising for soft robots to realize their accuracy control and intelligentization.

关键词： pneumatic torsional actuators self-sensing feedback voltage finite element modeling soft robots

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A subband excitation substitute based scheme for narrowband speech watermarking

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Frontiers of Information Technology & Electronic Engineering 2017年第5期18卷 627-643页

作者： wei LIU Ai-qun hu School of lnformation Science and Engineering Southeast UniversityNanjing 210096China

We propose a new narrowband speech watermarking scheme by replacing part of the speech with a scaled and spectrally shaped hidden signal. Theoretically, it is proved that if a small amount of host speech is modified, then not only an ideal channel model for hidden communication can be established, but also high imperceptibility and good intelligibility can be achieved. Furthermore, a practical system implementation is proposed. At the embedder, the power normalization criterion is first imposed on a passband watermark signal by forcing its power level to be the same as the original passband excitation of the cover speech, and a synthesis filter is then used to spectrally shape the scaled watermark signal. At the extractor, a bandpass filter is first used to get rid of the out-of-band signal, and an analysis filter is then employed to compensate for the distortion introduced by the synthesis filter. Experimental results show that the data rate is as high as 400 bits/s with better bandwidth efficiency, and good imperceptibility is achieved. Moreover, this method is robust against various attacks existing in real applications.

关键词： Analysis filter Linear prediction Narrowband speech watermarking Passband excitation replacement Power normalization Spectral envelope shaping Synthesis filter

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Polymer-based smart fibers and textiles for wearable electronics

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Science China Technological Sciences 2025年第1期 85-120页

作者： Sanming hu Li WANG Zaixian YUAN Kun CHEN wei PENG Hai YIN Zhijun SHI Guang YANG School of Biomedical Engineering and Imaging Xianning Medical CollegeHubei University of Science and Technology College of Life Science and Technology Huazhong University of Science and Technology Wuhan Branch of the National Science Library Chinese Academy of Sciences

Smart fibers and textiles have attracted considerable interest for application in wearable devices because of their advantages of being human-friendly, lightweight, flexible, and comfortable. In addition, they are considered to have potential applications in health monitoring, energy management, and human-machine interaction systems. Polymers and polymer fibers,with excellent mechanical strength, wrinkle resistance, and heat resistance, are widely used to fabricate smart fibers and textiles. Herein, a comprehensive overview of polymer-based fibers and textiles is provided. First, we review the design principles of various polymer-based smart textiles, including textile-based sensors, energy capture and storage textiles, and computation and display textiles. Next, materials used for preparing polymer-based smart fibers, such as metals, carbon-based materials, and natural and synthetic polymers, particularly conductive polymers, are summarized. In addition, this review summarizes key technologies used for preparing smart fibers and the conventional structures of smart textiles. Furthermore, the applications of smart textiles in personal health monitoring, thermal management, energy capture and storage, and computation and displays are discussed. Finally, the current challenges, limitations, and future trends of smart fibers and textiles are discussed.

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Parameter Processes of a Strong Laser in Partially Stripped Plasmas

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Chinese Physics Letters 2000年第12期17卷 893-895页

作者： hu Xi-wei Department of Modern Physics University of Science and Technology of ChinaHefei 230026

The effects of the nonlinear polarization in a partially stripped plasma on the parameter processes of a strong laser are discussed. The nonlinear mode coupling equations of stimulated Raman scattering (SRS) are derived. The linear instability growth rates of SRS and stimulated Brillouin scattering (SBS) are given. When the pump wave intensity I0 > 1017 W/cm2, the third order susceptibility associated with bound electrons will reduce the SRS and SBS linear growth rate enormous1y. In addition, the nonlinear susceptibility can affect the nonlinear evolution of SRS and SBS significantly.

关键词： nonlinear susceptibility Parameter

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Magnetron sputtering deposition of silicon nitride on polyimide separator for high-temperature lithium-ion batteries

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Journal of Energy Chemistry 2021年第5期30卷 1-10页

作者： Can Liao wei Wang Junling Wang Longfei han Shuilai Qiu Lei Song Zhou Gui Yongchun Kan Yuan hu State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026AnhuiChina

To date,lithium-ion batteries are becoming increasingly significant in the application of portable devices and electrical vehicles,and revolutionary progress in theoretical research and industrial application has been ***,the commercial polyolefin separators with unsatisfying electrolytes affinity and poor thermal stability have extremely restricted the further application of lithium-ion batteries,especially in the high-temperature *** this work,magnetron sputtering deposition technique is employed to modify the commercial polyimide separator by coating silicon nitride on both *** sputtering deposition modified polyimide(MSD-PI)composite separator shows high thermal stability and ionic *** importantly,compared with the cells using Celgard separator,the cells with MSD-PI separator exhibit superior electrochemical performance,especially long-term cycle performance under high temperature environment,owing to the high thermal conductivity of surface Si3 N4 ***,lithium-ion batteries with MSD-PI separator are capable of improving thermal safety and capacity retention,which demonstrates that magnetron sputtering deposition technique could be regarded as a promising strategy to develop advanced organic/inorganic composite separators for high-temperature lithium-ion batteries.

关键词： Polyimide Magnetron sputtering deposition Lithium-ion batteries High temperature Safety

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Novel Co-free high performance TRIP and TWIP medium-entropy alloys at cryogenic temperatures

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Journal of Materials Science & Technology 2020年第22期54卷 153-158页

作者： Ran wei Kaisheng Zhang Liangbin Chen Zhenhua han Tan Wang Chen Chen Jianzhong Jiang Tingwei hu Fushan Li School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China College of Physics and Electronic Engineering Xinyang Normal UniversityXinyang 464000China School of Materiab Science and Engineering Xi'an University of TechnologyXi'an710048China International Center for New-Structured Materials(1CNSM) Laboratory of New-Structured MaterialsState Key Laboratory of Silicon Materialsand School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Tropical Translational Medicine of Ministry of Education/School of Tropical Medicine and Laboratory Medicine Hainan Medical UniversityHaikou 571199China

Recently,high-and medium-entropy alloys(HEAs and MEAs) have been found to exhibit excellent cryogenic mechanical properties,but most of them contain high-priced Co ***,developing HEAs or MEAs with high strength and ductility and relatively low cost is *** this work,novel Cofree Fex Mn(75-x) Ni(10)Cr(15)(x=50 and 55 at.%) MEAs were developed,which exhibit a good combination of low cost,high strength and ductility at cryogenic *** was found that the Fe(50)Mn(25)Ni(10)Cr(15)MEA exhibits a combination of cryogenic tensile strength of^0.98 GPa and ductility of^83 %.The excellent cryogenic mechanical properties were attributed to joint of twinning-induced plasticity(TWIP) and transformation-induced plasticity(TRIP) *** present study sheds light on developing low cost MEAs with high perfo rmance for cryogenic-tempe rature applications.

关键词： Medium-entropy alloys(MEAs) Transformation-induced plasticity(TRIP) Twinning induced plasticity(TWIP) Mechanical properties Cryogenic temperature

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Assessment of Flue Gas Reinjecting Operating Strategy in Performance of CCHP System using Energy Level Difference Analysis

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Journal of Thermal Science 2023年第1期32卷 125-134页

作者： WANG Zefeng han wei LI Yimin Beijing huairou Laboratory Beijing 101400China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academyof Sciences Beijing 100049China

A proper operating strategy is helpful to improve the off-design performance of combined cooling,heating and power(CCHP)systems,providing high efficiency and low *** energy level difference graphic analysis method is used to identify energy level as well as exergy destruction of the part-load *** method illustrates the energy efficiency upgrading mechanism of the flue gas reinjecting(FGR)operating *** is referenced to a reducing turbine inlet temperature(TIT)operating *** comparison,the FGR operating strategy leads to a 2.62%exergy distribution reduction in a gas turbine at an 85%load level due to the decrease of the energy level *** the output power is reduced further,the FGR operating strategy is supplanted by the TIT operating strategy with the limit of compressor inlet ***,the opposite results of exergy distribution are presented in the exhaust-heat recovery devices.A heat-driven refrigeration and power cycle is introduced in a typical CCHP system as a ***,the results suggest that the operational flexibility of the CCHP system is improved by enlarging the ratio of cooling to electricity.

关键词： CCHP systems off-design performance energy level difference analysis operating strategies

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Damped Jaynes-Cummings Model Including Spontaneous Emission

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Chinese Physics Letters 2001年第2期18卷 220-222页

作者： TAN wei-han Department of Physics Shanghai UniversityShanghai 201800

As a continuation of the previous paper‘Collapse and revival in the damped Jaynes-Cummings model’[***.16(1999)895],at present the problem is solved under the condition that the atomic spontaneous emission is *** the case of no damping,c=0,γ_(1)≠0,γ_(2)≠0,the half atomic inversion operatorpossesses an analytic solution,whereas in the general case c≠0,the problem is reduced to the numerical evaluation of first-order nonlinear differential *** final results show that with the increase ofγ_(1) andγ_(2),the kinetic quantities converge rapidly to stationary solutions.

关键词： equations stationary quantities

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Facilitation of cascade biocatalysis by artificial multi-enzyme complexes——A review

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Chinese Journal of Chemical Engineering 2020年第11期28卷 2799-2809页

作者： Xinlei wei Pingping han Chun You Tianjin Institute of Industrial Biotechnology Chinese Academy of SciencesTianjin 300308China

Multi-enzyme complexes are the results of natural evolution to facilitate cascade *** enzyme colocalization within a complex,the transfer efficiency of reaction intermediates between adjacent cascade enzymes can be promoted,resulting in enhanced overall reaction *** by nature,a variety of approaches have been developed for the assembly of artificial multi-enzyme complexes with different spatial organizations,aiming at improving the catalytic efficiency of enzyme cascade.A recent trend of this research area is the creation of enzyme complexes with a controllable spatial organization which helps with the mechanistic studies and bears the potential to further increase metabolic *** this review,we summarize versatile strategies for the assembly of artificial multi-enzyme complexes,followed by an inspection of the mechanistic studies of artificial multi-enzyme complexes for their enhancement of catalytic ***,we provide some highlighted in vivo,ex vivo,and in vitro examples that demonstrate the ability of artificial multi-enzyme complexes for enhancing the overall production efficiency of value-added *** research progress has revealed the great biotechnological potential of artificial multi-enzyme complexes as a powerful tool for biomanufacturing.

关键词： Enzyme Biocatalysis Cascade reaction scaffold substrate channeling synthetic biology

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