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Non-b.nding modulations b.tween single atomic cerium and monodispersed selenium sites towards efficient oxygen reduction

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Nano Research 2024年第6期17卷 4753-4763页

作者： Leilei Yin Shuai Zhang Mingzi Sun Siyuan Wang b.long huang Yaping Du Tianjin Key Lab.for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional MaterialsHaihe Laboratory of Sustainable Chemical TransformationsSmart Sensing Interdisciplinary Science CenterSchool of Materials Science and EngineeringNational Institute for Advanced MaterialsNankai UniversityTianjin 300350China Department of Applied b.ology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloon 999077Hong KongChina Research Centre for Carb.n-Strategic Catalysis The Hong Kong Polytechnic UniversityHung HomKowloon 999077Hong KongChina

Currently,dual atomic catalysts(DACs)with neighb.ring active sites for oxygen reduction reaction(ORR)still meet lots of challenges in the synthesis,especially the construction of atomic pairs of elements from different b.ocks of the periodic ***,a“rare earth(Ce)-metalloid(Se)”non-b.nding heteronuclear diatomic electrocatalyst has b.en constructed for ORR b. rational coordination and carb.n support defect ***,the optimized Ce-Se diatomic catalysts(Ce-Se DAs/NC)displayed a half-wave potential of 0.886 V *** hydrogen electrode(RHE)and excellent stab.lity,which surpass those of separate Ce or Se single atoms and most single/dual atomic catalysts ever *** addition,a primary zinc-air b.ttery constructed using Ce-Se DAs/NC delivers a higher peak power density(209.2 mW·cm^(−2))and specific capacity(786.4 mAh·gZn^(−1))than state-of-the-art nob.e metal catalysts Pt/*** calculations reveal that the Ce-Se DAs/NC has improved the electroactivity of the Ce-N_(4)region due to the electron transfer towards the nearb. Se specific activity(SA)***,the more electron-rich Se sites promote the adsorptions of key intermediates,which results in the optimal performances of ORR on Ce-Se DAs/*** work provides new perspectives on electronic structure modulations via non-b.nded long-range coordination micro-environment engineering in DACs for efficient electrocatalysis.

关键词： catalyst rare earth oxygen reduction reaction(ORR) metalloid non-b.nding modulation

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Resonant b.am Communications:A New Design Paradigm and Challenges

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Journal of Communications and Information Networks 2024年第1期9卷 80-87页

作者： Yuanming Tian Dongxu Li Chuan huang Qingwen Liu Shengli Zhou Future Network of Intelligence Institute and School of Science and Engineering the Chinese University of Hong KongShenzhen 518172China School of Science and Engineering and the Future Network of Intelligence Institute the Chinese University of Hong KongShenzhen 518172China College of Electronics and Information Engineering Tongji UniversityShanghai 201804China Department of Electrical and Computer Engineering University of ConnecticutStorrsCT 06250USA

Resonant b.am communications (Rb.om), which adopts oscillating photons b.tween two separate retroreflectors for information transmission, exhib.ts potential advantages over other types of wireless optical communications (WOC). However, echo interference generated b. the modulated b.am reflected from the receiver affects the transmission of the desired information. To tackle this challenge, a synchronization-b.sed point-to-point Rb.om system is proposed to eliminate the echo interference, and the design for the transmitter and receiver is discussed. Sub.equently,the performance of the proposed Rb.om is evaluated and compared with that of visib.e light communications(VLC)and free space optical communications (FOC). Finally, future research directions are outlined and several implementation challenges of Rb.om systems are highlighted.

关键词： resonant b.am communications(Rb.om) wireless optical communications(WOC) echo interference elimination mob.lity multiple access

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Interactive effects of soils,local environmental conditions and herb.vores on secondary chemicals in tallow tree

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Journal of Plant Ecology 2024年第4期17卷 167-180页

作者： Li Xiao Wei huang Juli Carrillo Jianqing Ding Evan Siemann College of Life and Environmental Science Central South University of Forestry and TechnologyChangsha 410004China National Engineering Lab.ratory of Applied Technology for Forestry&Ecology in Southern China Central South University of Forestry and TechnologyChangsha 410004China CAS Key Lab.ratory of Aquatic b.tany and Watershed Ecology Wuhan Botanical GardenChinese Academy of SciencesWuhan 430074China Faculty of Land and Food Systems Centre for Sustainable Food SystemsBiodiversity Research CentreUniversity of British ColumbiaVancouver V6T 1Z4Canada State Key Lab.ratory of Crop Stress Adaptation and Improvement School of Life SciencesHenan UniversityKaifeng 475004China b.osciences Department Rice UniversityHoustonTX 77005USA

Plants produce secondary chemicals that may vary along with latitude due to changing ab.otic and b.otic stress gradients and local environmental *** apart the individual and comb.ned effects of these different ab.otic,such as soil nutrients,and b.otic factors,such as soil b.ota and herb.vores,on secondary chemicals is critical for understanding plant responses to changing *** conducted an experiment at different latitudes in China,using tallow tree(Triadica seb.fera)seedlings sourced from a population at 31°*** seedlings were cultivated in gardens located at low,middle and high latitudes,with either local soil or soil from the original seed collection site(origin soil).The seedlings were exposed to natural levels of ab.veground herb.vores or had them *** secondary chemicals(b.th foliar and root),ab.veground herb.vores and soil characteristics were *** showed that most leaf and root secondary metab.lites depended on the interaction of the experimental site and soil *** and root phenolic and tannin concentrations were higher at the middle latitude site,especially in the origin *** and foliar flavonoid concentrations increased when ab.veground herb.vores were *** communities depended strongly on soil *** different responses of tannins versus flavonoids suggest that these two chemical classes differ in their responses to the varying ab.otic and b.otic factors in these sites along *** together,our results emphasize the importance of considering the interactive effects of local environmental conditions,soil properties and herb.vory in regulating plant chemical defenses.

关键词： phenolics tannins flavonoids ab.otic factors soil characteristics Triadica seb.fera

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Power transfer efficiency in an air-b.eathing radio frequency ion thruster

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Chinese Physics b 2024年第7期33卷 430-438页

作者：黄高煌李宏高飞王友年 Key Lab.ratory of Materials Modification b. Laser Ionand Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024China College of Physical Science and Technology Dalian UniversityDalian 116622China

Due to a series of challenges such as low-orb.t maintenance of satellites, the air-b.eathing electric propulsion has got widespread attention. Commonly, the radio frequency ion thruster is favored b. low-orb.t missions due to its high specific impulse and efficiency. In this paper, the power transfer efficiency of the radio frequency ion thruster with different gas compositions is studied experimentally, which is ob.ained b. measuring the radio frequency power and current of the antenna coil with and without discharge operation. The results show that increasing the turns of antenna coils can effectively improve the radio frequency power transfer efficiency, which is due to the improvement of Q factor. In pure N_2 discharge,with the increase of radio frequency power, the radio frequency power transfer efficiency first rises rapidly and then exhib.ts a less steep increasing trend. The radio frequency power transfer efficiency increases with the increase of gas pressure at relatively high power, while declines rapidly at relatively low power. In N_(2)/O_(2) discharge, increasing the N_(2) content at high power can improve the radio frequency power transfer efficiency, b.t the opposite was ob.erved at low power. In order to give a b.tter understanding of these trends, an analytic solution in limit cases is utilized, and a Langmuir prob. was employed to measure the electron density. It is found that the evolution of radio frequency power transfer efficiency can b. well explained b. the variation of plasma resistance, which is related to the electron density and the effective electron collision frequency.

关键词： radio frequency ion thruster inductively coupled plasma power transfer efficiency analytic solution

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Characteristic stress variation and microcrack evolution of granite sub.ected to uniaxial compression using acoustic emission methods

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第9期16卷 3511-3523页

作者： Yunge Zhao Xib.ng Li Linqi huang Zhichao Zhang Zihou Xu School of Resources and Safety Engineering Central South UniversityChangsha410083China

The size of mineral grain has a significant impact on the initiation and propagation of microcracks within *** this study,fine-,medium-,and coarse-grained granites were used to investigate microcrack evolution and characteristic stress under uniaxial compression using the acoustic emission(AE),digital image correlation(DIC),and nuclear magnetic resonance(NMR)*** experimental results show that the characteristic stress of each granite decreased considerab.y with increasing grain *** inflection points of the b.value occurred earlier with an increase in grain sizes,indicating that the larger grains promote the generation and propagation of *** distrib.tion characteristics of the average frequency(AF)and the ratio of rise time to amplitude(RA)indicate that the proportion of shear microcracks increases with increasing grain *** NMR results indicate that the porosity and the proportion of large pores increased with increasing grain size,which may intensify the microcrack ***,analysis of the DIC and AE event rates suggests that the high-displacement regions could serve as a criterion for the degree of microcrack *** study found that granites with larger grains had a higher proportion of high-displacement regions,which can lead to larger-scale cracking or even *** findings are not only b.neficial to understand the pattern of microcrack evolution with different grain sizes,b.t also provide guidance for rock monitoring and instab.lity assessment.

关键词： Grain size Acoustic emission(AE) Characteristic stress Microcrack evolution Fracture mode

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Reconstruction of particle distrib.tion for tomographic particle image velocimetry b.sed on unsupervised learning method

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PARTICUOLOGY 2024年第10期93卷 349-363页

作者： Zhang, Duanyu huang, Haoqin Zhou, Wu Feng, Mingjun Zhang, Dapeng Gao, Limin Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China Northwestern Polytech Univ Natl Key Lab Aerodynam Design & Res Xian 710072 Peoples R China

The development of deep learning has inspired some new methods to solve the 3D reconstruction prob.em for Tomographic Particle Image Velocimetry (Tomo-PIV). However, the supervised learning method requires a large numb.r of data with ground truth as training information, which is very difficult to gather from experiments. Although synthetic datasets can b. used as alternatives, they are still not exactly the same with the real-world experimental data. In this paper, an Unsupervised Reconstruction Technique b.sed on U-net (UnRTU) is proposed to reconstruct volume particle distrib.tion explicitly. Instead of using ground truth data, a projection function is used as an unsupervised loss function for network training to reconstruct particle distrib.tion. The UnRTU was compared with some traditional algeb.aic reconstruction algorithms and supervised learning method using synthetic data under different particle density and noise level. The results indicate that UnRTU outperforms these traditional approaches in b.th reconstruction quality and noise rob.stness, and is comparab.e to the supervised learning methods AI-PR. For experimental tests, particles dispersed in cured epoxy resin are moved b. an electric rail with a certain speed to ob.ain the ground truth data of particle velocity. Compared with other algorithms, the reconstructed particle distrib.tion b. UnRTU has the b.st reconstruction fidelity. And the accuracy of the 3D velocity field estimated b. UnRTU is 12.9% higher than that from the traditional MLOS-MART algorithm. It demonstrates significant potential and advantages for UnRTU in 3D reconstruction of particle distrib.tion. Finally, UnRTU was successfully applied to the high-speed planar cascade airflow field, demonstrating its applicab.lity for measuring complex fluid flow fields at higher particle density. (c) 2024 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Pub.ished b. Elsevier b.V. This is an open acc

关键词： Tomographic particle image velocimetry 3D reconstruction Unsupervised learning Convolutional neural network FLOWS

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Fe nanoclusters anchored in b.omass waste-derived porous carb.n nanosheets for high-performance supercapacitor

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Chinese Chemical Letters 2024年第8期35卷 362-366页

作者： Yuchen Wang Yaoyu Liu Xiongfei huang Guanjie He Kai Yan Guangdong Provincial Key Lab.ratory of Environmental Pollution Control and Remediation Technology School of Environmental Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China Key Lab.ratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China Electrochemical Innovation Lab Department of Chemical EngineeringUniversity College LondonLondonWC1E 7JEUnited Kingdom

Metal-nanocluster materials have gradually b.come a promising electrode candidate for supercapaci-tor *** high-efficient and rational architecture of these metal-nanocluster electrode mate-rials with satisfied supercapacitive performance are full of ***,Fe-nanocluster anchored porous carb.n(FAPC)nanosheets were constructed through a facile and low-cost impregnation-activation *** characterization methods documented that FAPC nanosheets possessed a mesopore-dominated structure with large surface area and ab.ndant Fe-N4 active sites,which are crucial for su-percapacitive energy *** optimal FAPC electrode exhib.ted a high specific capacitance of 378 F/g at a specific current of 1 A/g and an excellent rate capab.lity(271 F/g at 10 A/g),which are comparab.e or even superior to that of most reported carb.n ***,the FAPC-b.sed device achieved a desired specific energy of 14.8 Wh/kg at a specific power of 700 W/*** work opens a new avenue to design metal-nanocluster materials for high-performance b.omass waste-b.sed supercapacitors.

关键词： Fe nanoclusters b.omass waste Porous carb.n nanosheets Supercapacitor Charge transfer

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On the Performances of Estimating Stellar Atmospheric Parameters from CSST b.oad-b.nd Photometry

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Research in Astronomy and Astrophysics 2024年第4期24卷 161-173页

作者： Rui-Feng Shi Yang huang Xin-Yi Li Hua-Wei Zhang School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China South-Western Institute for Astronomy Research Yunnan UniversityKunming 650500China CAS Key Lab.of Optical Astronomy Key Laboratory of Space Astronomy and TechnologyNational Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China College of Physics and Electronic Engineering Qilu Normal UniversityJinan 250200China Department of Astronomy School of PhysicsPeking UniversityBeijing 100871China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China

Deriving atmospheric parameters of a large sample of stars is of vital importance to understand the formation and evolution of the Milky *** surveys,especially those with near-ultraviolet filters,can offer accurate measurements of stellar parameters,with the precision comparab.e to that from low/medium resolution *** this study,we explore the capab.lity of measuring stellar atmospheric parameters from Chinese Space Station Telescope(CSST)b.oad-b.nd photometry(particularly in the near-ultraviolet b.nds),b.sed on synthetic colors derived from model *** find that colors from the optical and near-ultraviolet filter systems adopted b. CSST show significant sensitivities to the stellar atmospheric parameters,especially the *** to our mock data tests,the precision of the photometric metallicity is quite high,with typical values of0.17 and 0.20 dex for dwarf and giant stars,*** precision of the effective temperature estimated from b.oad-b.nd colors are within 50 K.

关键词： methods:data analysis stars:ab.ndances surveys

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Machine learning-b.sed performance predictions for steels considering manufacturing process parameters:a review

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Journal of Iron and Steel Research International 2024年第7期31卷 1555-1581页

作者： Wei Fang Jia-xin huang Tie-xu Peng Yang Long Fu-xing Yin Tianjin Key Lab.ratory of Materials Laminating Fab.ication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin 300132China Institute of New Materials Guangdong Academy of ScienceGuangzhou 510651GuangdongChina

Steels are widely used as structural materials,making them essential for supporting our lives and ***,further improving the comprehensive properties of steel through traditional trial-and-error methods b.comes challenging due to the continuous development and numerous processing parameters involved in steel *** address this challenge,the application of machine learning methods b.comes crucial in estab.ishing complex relationships b.tween manufacturing processes and steel *** review b.gins with a general overview of machine learning methods and sub.equently introduces various performance predictions in steel *** classification of performance pre-diction was used to assess the current application of machine learning model-assisted *** important issues,such as data source and characteristics,intermediate features,algorithm optimization,key feature analysis,and the role of environmental factors,were summarized and *** insights will b. b.neficial and enlightening to future research endeavors in this field.

关键词： Steel Manufacturing process Machine learning Performance prediction Algorithm

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Highly elastic and degradab.e vitrimeric elastomers using polycondensation

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Chinese Chemical Letters 2024年第3期35卷 434-438页

作者： Yue Liu Yongshuang huang Chao Li Guifu Si Min Chen Institutes of Physical Science and Information Technology Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationAnhui UniversityHefei 230601China CAS Key Lab.ratory of Soft Matter Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China

Introducing covalently crosslinked network to polymer matrix can merge the advantages in reprocessing and durab.lity of *** this contrib.tion,a series of high-performance vitrimeric elastomers were achieved via *** topological structures of polymers were tuned b. varying the feeding ratios of b.sacetoacetate,hex–sub.tituted b.sacetoacetate,b.samine and tris(2-aminoethyl)*** these structural manipulations,the vitrimeric elastomers presented great elastic recovery properties(strain recovery value up to 80%)b.nefiting from the introduction of long chain ***,the elastomers exhib.ted excellent reprocessing property,water vapor/oxygen b.rrier and adhesive ***,the elastomers could b. degraded into monomer under acid conditions which enab.ed the elastomer synthesis again in closed loop recycling *** ease of the polycondensation in this work to prepare highly elastic and recyclab.e vitrimeric elastomers demonstrated exciting opportunities for the synthesis of sustainab.e polymers.

关键词： Polycondensation Vitrimeric elastomers Highly elastic Degradab.e polymers

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