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Annals of Applied Mathematics 2024年第1期 43-70页

作者： Yanming Lai kewei liang Ping Lin Xiliang Lu Qimeng Quan School of Mathematics and Statistics Wuhan University School of Mathematical Sciences Zhejiang University Division of Mathematics University of Dundee School of Mathematics and Statistics and Hubei Key Laboratory of Computational Science Wuhan University

In this paper we investigate the nonconforming P1finite element approximation to the sequential regularization method for unsteady Navier-Stokes equations. We provide error estimates for a full discretization scheme. Typically, conforming P1finite element methods lead to error bounds that depend inversely on the penalty parameter ?. We obtain an ?-uniform error bound by utilizing the nonconforming P1finite element method in this paper. Numerical examples are given to verify theoretical results.

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Skin‑Inspired Ultra‑Tough Supramolecular Multifunctional Hydrogel Electronic Skin for Human–Machine Interaction

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Nano-Micro Letters 2023年第8期15卷 1-19页

作者： Kun Chen kewei liang He Liu Ruonan Liu Yiying Liu Sijia Zeng Ye Tian College of Medicine and Biological Information Engineering Northeastern UniversityShenyang 110169People’s Republic of China Foshan Graduate School of Innovation Northeastern UniversityFoshan 528300People’s Republic of China

Multifunctional supramolecular ultra-tough bionic e-skin with unique durability for human–machine interaction in complex scenarios still remains challenging.Herein,we develop a skininspired ultra-tough e-skin with tunable mechanical properties by a physical cross-linking salting-freezing-thawing method.The gelling agent(β-Glycerophosphate sodium:Gp)induces the aggregation and binding of PVA molecular chains and thereby toughens them(stress up to 5.79 MPa,toughness up to 13.96 MJ m^(−3)).Notably,due to molecular self-assembly,hydrogels can be fully recycled and reprocessed by direct heating(100°C for a few seconds),and the tensile strength can still be maintained at about 100%after six recoveries.The hydrogel integrates transparency(>60%),super toughness(up to 13.96 MJ m^(−3),bearing 1500 times of its own tensile weight),good antibacterial properties(E.coli and S.aureus),UV protection(Filtration:80%–90%),high electrical conductivity(4.72 S m^(−1)),anti-swelling and recyclability.The hydrogel can not only monitor daily physiological activities,but also be used for complex activities underwater and message encryption/decryption.We also used it to create a complete finger joint rehabilitation system with an interactive interface that dynamically presents the user’s health status.Our multifunctional electronic skin will have a profound impact on the future of new rehabilitation medical,human–machine interaction,VR/AR and the metaverse fields.

关键词： Ultra-tough hydrogel Supramolecular Flexible electronics Knuckle training Human-machine interaction

Rhizoma Drynariae-derived nanovesicles reverse osteoporosis by potentiating osteogenic differentiation of human bone marrow mesenchymal stem cells via targeting ERα signaling

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Acta Pharmaceutica Sinica B 2024年第5期14卷 2210-2227页

作者： Qing Zhao Junjie Feng Fubin Liu Qianxin liang Manlin Xie Jiaming Dong Yanfang Zou Jiali Ye Guilong Liu Yue Cao Zhaodi Guo Hongzhi Qiao Lei Zheng kewei Zhao Guangzhou Key Laboratory of Chinese Medicine Research on Prevention and Treatment of Osteoporosis the Third Affiliated Hospital of Guangzhou University of Chinese MedicineGuangzhou 510378China Guangdong Engineering Research Center of Chinese Herbal-derived Vesicles Guangzhou University of Chinese MedicineGuangzhou 510006China Department of Laboratory Medicine Nanfang HospitalSouthern Medical UniversityGuangzhou 510515China Guangdong Engineering and Technology Research Center for Rapid Diagnostic Biosensors Nanfang HospitalSouthern Medical UniversityGuangzhou 510515China The Fifth Affiliated Hospital Sun Yat-sen University Zhuhai 519000China Department of Blood Transfusion Guangdong Heyou International HospitalFoshan 528306China School of Pharmacy Nanjing University of Chinese MedicineNanjing 210023China

Although various anti-osteoporosis drugs are available,the limitations of these therapies,including drug resistance and collateral responses,require the development of novel anti-osteoporosis agents.Rhizoma Drynariae displays a promising anti-osteoporosis effect,while the effective component and mechanism remain unclear.Here,we revealed the therapeutic potential of Rhizoma Drynariae-derived nanovesicles(RDNVs)for postmenopausal osteoporosis and demonstrated that RDNVs potentiated osteogenic differentiation of human bone marrow mesenchymal stem cells(hBMSCs)by targeting estrogen receptor-alpha(ERα).RDNVs,a natural product isolated from fresh Rhizoma Drynariae root juice by differential ultracentrifugation,exhibited potent bone tissue-targeting activity and anti-osteoporosis efficacy in an ovariectomized mouse model.RDNVs,effectively internalized by hBMSCs,enhanced proliferation and ERαexpression levels of hBMSC,and promoted osteogenic differentiation and bone formation.Mechanistically,via the ERαsignaling pathway,RDNVs facilitated mRNA and protein expression of bone morphogenetic protein 2 and runt-related transcription factor 2 in hBMSCs,which are involved in regulating osteogenic differentiation.Further analysis revealed that naringin,existing in RDNVs,was the active component targeting ERαin the osteogenic effect.Taken together,our study identified that naringin in RDNVs displays exciting bone tissue-targeting activity to reverse osteoporosis by promoting hBMSCs proliferation and osteogenic differentiation through estrogen-like effects.

关键词： Rhizoma Drynariae-derived nanovesicles Bone marrow mesenchymal stem cells Bone targeting Osteogenic differentiation ERαsignaling Naringin Bone morphogenetic protein 2 Runt-related transcription factor 2

Heat Dissipation Performance of Metal Core Printed Circuit Board with Micro Heat Exchanger

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Journal of Harbin Institute of Technology(New Series) 2020年第1期27卷 91-96页

作者： Diancheng Qin kewei liang Guangdong LED Packaging⁃Used Heat Dissipation Substrate Engineering Technology Research Center Zhuhai 519180GuangdongChina Rayben Technologies(Zhuhai)Limited Zhuhai 519180GuangdongChina

A Metal Core Printed Circuit Board with Micro Heat Exchanger(MHE MCPCB)was introduced for thermal management of high power LED.A comparative study was performed between 4 W/(m·K)regular MCPCB and this novel MCPCB to investigate the heat dissipation performance of this novel MCPCB.It was found that MHE MCPCB can obviously enhance the comprehensive optical properties of LED in comparison with 4 W/(m·K)regular MCPCB.Additionally,thermal contact resistance confining a dominant part of heat within the micro heat exchanger to achieve high efficient heat dissipation was proved.

关键词： MHE MCPCB heat dissipation performance LED optical property

基于聚吡咯/蛭石/海藻纤维复合半导体材料的瞬态压阻传感器

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Science China Materials 2024年第2期67卷 580-587页

作者：王鹏真梁俊轩田维亮张克伟夏延致 State Key Laboratory of Bio-Fibers and Eco-Textiles Collaborative Innovation Center for Marine Biomass FibersMaterials and Textiles of Shandong ProvinceCollege of Materials Science and EngineeringInstitute of Marine Biobased MaterialsQingdao UniversityQingdao 266071China Key Laboratory of Chemical Engineering in South Xinjiang College of Chemistry and Chemical EngineeringTarim UniversityAlaer 843300China

电子皮肤、人机交互和健康监测等领域推动了柔性压力传感器的快速发展.然而,同时满足耐用和瞬态的需求对柔性压力传感器是一个巨大的挑战.本文开发了一种用于柔性瞬态压阻传感器的安全、耐受的聚吡咯/蛭石/海藻酸盐半导体框架.将带负电... 详细信息

电子皮肤、人机交互和健康监测等领域推动了柔性压力传感器的快速发展.然而,同时满足耐用和瞬态的需求对柔性压力传感器是一个巨大的挑战.本文开发了一种用于柔性瞬态压阻传感器的安全、耐受的聚吡咯/蛭石/海藻酸盐半导体框架.将带负电荷的蛭石纳米片插层到可生物降解的海藻酸盐织物中,进一步用高灵敏度的导电聚吡咯修饰.由此产生的多维框架实现了柔性传感器的稳定性,并且在使用寿命结束后可以在不留下电子垃圾的情况下逐渐降解.所获得的瞬态压阻传感器显示出了快速的响应时间(81/99 ms)和出色的抗疲劳性能.此外,我们开发了一种有效的机器学习模型用于人体动作识别和预测,准确率为100%.本工作为柔性瞬态电子学中有机-无机界面的设计提供了一种有前景的策略,并在基于舒适生物纤维的柔性平台中展现了广阔的应用前景.

关键词： piezoresistive sensors transient electronics machine learning tolerable hybrids

中亚热带典型岩溶森林植物多样性与环境因子关系的研究

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广西植物 2024年第3期44卷 428-438页

作者：林海丽袁柯伟梁志慧李玉玲梁士楚广西师范大学珍稀濒危动植物生态与环境保护教育部重点实验室广西桂林541006 广西师范大学生命科学学院广西桂林541006

为深入了解岩溶石山森林植被物种多样性和功能多样性及其与环境因子的关系,该研究通过群落学调查、功能性状和环境因子的测定,结合方差分析、多重比较和冗余分析等统计方法,对桂林岩溶石山落叶阔叶林、常绿落叶阔叶混交林和常绿阔叶林... 详细信息

为深入了解岩溶石山森林植被物种多样性和功能多样性及其与环境因子的关系,该研究通过群落学调查、功能性状和环境因子的测定,结合方差分析、多重比较和冗余分析等统计方法,对桂林岩溶石山落叶阔叶林、常绿落叶阔叶混交林和常绿阔叶林的物种多样性和功能多样性进行对比分析,探究环境因子对不同植被类型物种多样性与功能多样性的影响机制。结果表明:(1)常绿阔叶林的Patrick丰富度指数显著高于落叶阔叶林和常绿落叶阔叶混交林;Pielou均匀度指数在常绿落叶阔叶混交林最高,落叶阔叶林次之,常绿阔叶林最低。(2)常绿阔叶林的功能丰富度指数显著高于常绿落叶阔叶混交林和落叶阔叶林;功能均匀度指数在常绿落叶阔叶混交林中最高,落叶阔叶林次之,常绿阔叶林最低。(3)冗余分析结合蒙特卡洛随机置换检验结果显示,落叶阔叶林物种多样性主要受林冠开阔度和土壤水溶钙影响;功能多样性则受到土壤水溶钙和岩石裸露率的影响;岩石裸露率和土壤厚度是影响常绿落叶阔叶混交林物种多样性和功能多样性的主要制约因子。此外,物种多样性还受到土壤速效氮的显著影响;常绿阔叶林物种多样性和功能多样性主要受岩石裸露率、土壤含水量和土壤厚度的显著影响。该研究结果揭示了不同森林植被物种多样性和功能多样性对非生物环境变化的响应,拓展了对岩溶石山物种多样性和功能多样性的认识,为岩溶石山生物多样性保护提供了进一步的参考依据。

关键词：森林群落物种多样性功能多样性岩溶石山环境因子

‘黑金刚’黄皮在南宁市良庆区的表现及栽培技术

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农业研究与应用 2024年第1期37卷 28-32页

作者：李其位张克位梁宏合南宁市良庆区那马镇农业服务中心广西南宁530202 南宁市良庆区良庆镇农业服务中心广西南宁530201 广西壮族自治区亚热带作物研究所广西南宁530001

为了研究‘黑金刚’黄皮在广西南宁市良庆区的生长表现情况,对‘黑金刚’黄皮物候期、植物学性状及果实性状进行观测和评价。结果表明,该品种综合性状表现突出:3月中旬始花,8月中旬果实成熟;平均果穗质量323.5 g,果实中等大(单粒果质量... 详细信息

为了研究‘黑金刚’黄皮在广西南宁市良庆区的生长表现情况,对‘黑金刚’黄皮物候期、植物学性状及果实性状进行观测和评价。结果表明,该品种综合性状表现突出:3月中旬始花,8月中旬果实成熟;平均果穗质量323.5 g,果实中等大(单粒果质量平均8.1 g),单粒果实长圆形或近圆形(果实平均横径2.1 cm、纵径2.6 cm),成熟时果皮呈古铜色,完熟时果皮变黑褐色,果实可溶性固形物含量16.5%,可食率60.7%,每粒单果含种子1~2粒,果实清甜芳香,肉质结实柔滑,多汁无渣。总的来说,该品种有特色、品质优,能较好地迎合产销市场的需求,具有较广阔的发展前景,适合在广西南宁地区推广种植。

关键词： ‘黑金刚’黄皮物候期生物学性状栽培技术

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Sulfur-doped CMK-5 with expanded lattice for high-performance lithium ion batteries

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Chinese Chemical Letters 2023年第7期34卷 279-283页

作者： Zhenjin liang Yuhao Peng Xing Zhang kewei Cao Wei Xiao Dong Gu The Institute for Advanced Studies Wuhan UniversityWuhan 430072China College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072China

Heteroatom-doped porous carbon materials are very attractive for lithium ion batteries(LIBs) owing to their high specific surface areas, open pore structures, and abundant active sites. However, heteroatomdoped porous carbon with very high surface area and large pore volume are highly desirable but still remain a big challenge. Herein, we reported a sulfur-doped mesoporous carbon(CMK-5-S) with nanotubes array structure, ultrahigh specific surface area(1390 m^(2)/g), large pore volume(1.8 cm^(3)/g), bimodal pore size distribution(2.9 and 4.6 nm), and high sulfur content(2.5 at%). The CMK-5-S used as an anode material for LIBs displays high specific capacity, excellent rate capability and highly cycling stability. The initial reversible specific capacity at 0.1 A/g is as high as 1580 mAh/g and simultaneously up to 701 mAh/g at 1A/g even after 500 cycles. Further analysis reveals that the excellent electrochemical storage performances is attributed to its unique structures as well as the expanded lattice by sulfur-doping.

关键词： Mesoporous material CMK-5 Hollow structure Sulfur-doping Lithium ion batteries

Interactions between Pre-strain and Dislocation Structures and Its Effect on the Hydrogen Trapping Behaviors

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Acta Metallurgica Sinica(English Letters) 2023年第7期36卷 1193-1202页

作者： Rongjian Shi Yanqi Tu liang Yang Saiyu Liu Shani Yang kewei Gao Xu-Sheng Yang Xiaolu Pang Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing100083China School of Mathematics and Physics University of Science and Technology BeijingBeijing100083China Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen518057China Key Laboratory for Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing100084China

This work investigated the effect of pre-strain and microstructures and their interactions on hydrogen trapping behaviors in case of 1-GPa high-strength martensitic steel Fe-0.05C-0.30Si-1.10Mn-3.50Ni-0.53Cr-0.50Mo-0.03 V(wt%).We found that the trapped reversible and trapped irreversible hydrogen contents increased significantly after applying a pre-strain of 5%,with an increase in the trapped reversible hydrogen content from 0.6 ppm in the original sample to 2.1 ppm.The hydrogen desorption activation energy also showed a slight increase.The microstructural evolution revealed that the concomitant dislocation cell-twin duplex microstructure with high-density tangled dislocations after pre-strain substantially increased the trapped reversible hydrogen contents.Additionally,the tangled dislocations pinned by the nanoprecipitates acted as deep irreversible hydrogen traps,increasing the trapped hydrogen at high temperatures after applying 5%pre-strain.These findings provide an expanded understanding of the hydrogen trapping behaviors of pre-strained microstructures.

关键词： Hydrogen embrittlement Hydrogen trapping Pre-strain Deformed microstructure High-strength steel

Recycling and utilization of coal gasification residues for fabricating Fe/C composites as novel microwave absorbents

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International Journal of Minerals,Metallurgy and Materials 2023年第3期30卷 591-599页

作者： Guomin Li Xiaojie Xue Lutao Mao Yake Wang Lingxiao Li Guizhen Wang kewei Zhang Rong Zhang Yuexiang Wang Liping liang School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education Hainan UniversityHaikou 570228China State Key Laboratory for Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China China-Belarus Belt and Road Joint Laboratory on Electromagnetic Environment Effect Taiyuan 030032China

Under the background of a transformation of the global energy structure,coal gasification technology has a wide application prospect,but its by-product,the coal gasification residue(CGR),is still not being efficiently utilized for recycling.The CGR contains abundant carbon components,which could be applied to the microwave absorption field as the carbon matrix.In this study,Fe/CGR composites are fabricated via a two-step method,including the impregnation of Fe^(3+)and the reduction process.The influence of the different loading capacities of the Fe component on the morphology and electromagnetic properties is studied.Moreover,the loading content of Fe and the surface morphology of the Fe/CGR can be reasonably controlled by adjusting the concentration of the ferric nitrate solution.Meanwhile,Fe particles are evenly inserted on the CGR framework,which expands the Fe/CGR interfaces to enhance interfacial polarization,thus further improving the microwave-absorbing(MA)properties of composites.Particularly,as the Fe^(3+)concentration is 1.0 mol/L,the Fe/CGR composite exhibits outstanding performance.The reflection loss reaches-39.3 dB at 2.5 mm,and the absorption bandwidth covers 4.1 GHz at 1.5 mm.In this study,facile processability,resource recycling,appropriately matched impedance,and excellent MA performance are achieved.Finally,the Fe/CGR composites not only enhance the recycling of the CGR but also pioneer a new path for the synthesis of excellent absorbents.

关键词： coal gasification residue recycling utilization composite microwave absorption