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Closed-form solutions for free vibration of rectangular fGM thin plates resting on elastic foundation

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Acta Mechanica Sinica 2016年第6期32卷 1088-1103页

作者： T. f. xu y. f. Xing Institute of Solid Mechanics Beihang UniversityBeijing 100191 China China Academy.of Launch Vehicle Technology.R&D Center Beijing 100076 China

This article presents closed-form solutions for the frequency.analy.is of rectangular functionally.graded material (fGM) thin plates subjected to initially.in-plane loads and with an elastic foundation. Based on classical thin plate theory. the governing differential equations are derived using Hamilton's principle. A neutral surface is used to eliminate stretching-bending coupling in fGM plates on the basis of the assumption of constant Poisson's ratio. The resulting governing equation of fGM thin plates has the same form as homogeneous thin plates. The separation-of-variables method is adopted to obtain solutions for the free vibration problems of rectangular fGM thin plates with separable boundary.conditions, including, for example, clamped plates. The obtained normal modes and frequencies are in elegant closed forms, and present formulations and solutions are validated by.comparing present results with those in the literature and finite element method results obtained by.the authors. A parameter study.reveals the effects of the power law index n and aspect ratio a/b on frequencies.

关键词： functionally.graded material free vibration Rectangular plate Close form solutions Neutral surface

Protein arginine methy.transferase-6 regulates heterogeneous nuclear ribonucleoprotein-f expression and is a potential target for the treatment of neuropathic pain

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Neural Regeneration Research 2025年第9期20卷 2682-2696页

作者： Xiaoy. Zhang y.qi Liu fangxia xu Chengcheng Zhou Kaimei Lu Bin fang Lijuan Wang Lina Huang Zifeng xu Department of Anesthesiology International Peace Maternity and Child Health HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghaiChina Department of Anesthesiology Shanghai General HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghaiChina Shanghai Key.Laboratory.of Embry. Original Diseases ShanghaiChina

Protein arginine methy.transferase-6 participates in a range of biological functions,particularly.RNA processing,transcription,chromatin remodeling,and endosomal ***,it remains unclear whether protein arginine methy. transferase-6 modifies neuropathic pain and,if so,what the mechanisms of this *** this study.protein arginine methy.transferase-6 expression levels and its effect on neuropathic pain were investigated in the spared nerve injury.model,chronic constriction injury.model and bone cancer pain model,using immunohistochemistry.western blotting,immunoprecipitation,and label-free proteomic *** results showed that protein arginine methy.transferase-6 mostly.co-localized withβ-tubulinⅢin the dorsal root ganglion,and that its expression decreased following spared nerve injury.chronic constriction injury.and bone cancer *** addition,PRMT6 knockout(Prmt6~(-/-))mice exhibited pain ***,the development of spared nerve injury.induced hy.ersensitivity.to mechanical pain was attenuated by.blocking the decrease in protein arginine methy.transferase-6 ***,when protein arginine methy.transferase-6 expression was downregulated in the dorsal root ganglion in mice without spared nerve injury.increased levels of phosphory.ated extracellular signal-regulated kinases were observed in the ipsilateral dorsal horn,and the response to mechanical stimuli was ***,protein arginine methy.transferase-6 appeared to contribute to spared nerve injury.induced neuropathic pain by.regulating the expression of heterogeneous nuclear ***,protein arginine methy.transfe rase-6-mediated modulation of hete rogeneous nuclear ribonucleoprotein-f expression required amino atids 319 to 388,but not classical H3R2 *** findings indicated that protein arginine methy.transferase-6 is a potential therapeutic target fo r the treatment of peripheral neuro pathic pain.

关键词： dorsal root ganglion heterogeneous nuclear ribonucleoprotein f neuropathic pain protein arginine methy.transferase-6 sensory.neurons

Tailoring Light–Matter Interactions in Overcoupled Resonator for Biomolecule Recognition and Detection

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Nano-Micro Letters 2025年第1期17卷 262-280页

作者： Dongxiao Li Hong Zhou Zhihao Ren Cheng xu Chengkuo Lee Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore Center for Intelligent Sensors and MEMS(CISM) National University of SingaporeSingapore 117608Singapore

Plasmonic nanoantennas provide unique opportunities for precise control of light–matter coupling in surface-enhanced infrared absorption(SEIRA)spectroscopy.but most of the resonant sy.tems realized so far suffer from the obstacles of low sensitivity.narrow bandwidth,and asy.metric fano resonance ***,we demonstrated an overcoupled resonator with a high plasmon-molecule coupling coefficient(μ)(OC-Hμresonator)by.precisely.controlling the radiation loss channel,the resonator-oscillator coupling channel,and the frequency.detuning *** observed a strong dependence of the sensing performance on the coupling state,and demonstrated that OC-Hμresonator has excellent sensing properties of ultra-sensitive(7.25%nm^(−1)),ultra-broadband(3–10μm),and immune asy.metric fano *** characteristics represent a breakthrough in SEIRA technology.and lay.the foundation for specific recognition of biomolecules,trace detection,and protein secondary.structure analy.is using a single array.array.size is 100×100μm^(2)).In addition,with the assistance of machine learning,mixture classification,concentration prediction and spectral reconstruction were achieved with the highest accuracy.of 100%.finally.we demonstrated the potential of OC-Hμresonator for SARS-CoV-2 *** findings will promote the wider application of SEIRA technology.while providing new ideas for other enhanced spectroscopy.technologies,quantum photonics and study.ng light–matter interactions.

关键词： Plasmonic nanoantennas Light-matter interaction Surface-enhanced infrared absorption Overcoupled Biosensing

Stabilizing nanograined fe-Cr alloy.by.Si-assisted grain boundary.segregation

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Journal of Materials Science & Technology 2023年第3期134卷 223-233页

作者： X.f.xu X.y.Li B.Zhang Sheny.ng National Laboratory.for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

Intentional solute segregation at grain boundary.GB)can effectively.stabilize the nanograined alloy. by.reducing the excess energy.and mobility.of GB,but it usually.works for binary.alloy. with sufficient GB segregation ***,we found that the segregation of Cr can be enhanced in a nanostruc-tured fe-8Cr alloy.with insufficient GB segregation tendency.through the interaction of another solute Si(1.0 wt.%).After surface mechanical grinding treatment and subsequent annealing,the nanograined fe-8Cr-1Si is more thermally.stable than the nanograined fe-8Cr,which is mainly.attributed to the Si-enhanced Cr segregation as observed by.Super-X energy.dispersive X-ray.spectroscopy.EDS)mapping *** the grain refinement to nanoscale,the thermal stability.is further improved due to the in-crease of Cr content at GBs and the precipitates formed at appropriate high *** present finding provides guidance for the development of advanced nanostructured ternary.alloy..

关键词： Segregation Grain boundary fe-Cr-Si alloy Nanocry.talline Thermal stability

Intelligent Manufacturing in the Context of Industry.4.0： A Review

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Engineering 2017年第5期3卷 616-630页

作者： Ray.y. Zhong xun xu Eberhard Klotz Stephen T. Newman Department of Mechanical Engineering The University of Auckland Auckland 1142 New Zealand Industry.4.0 Campaign Festo AG & Co. KG Esslingen F3726 Germany Department of Mechanical Engineering University of Bath Bath BA2 7AY UK

Our next generation of industry.lndustry.4.0-holds the promise of increased flexibility.in manufacturing, along with mass customization, better quality. and improved productivity. It thus enables companies to cope with the challenges of producing increasingly.individualized products with a short lead-time to market and higher quality. Intelligent manufacturing play. an important role in Industry.4.0. Ty.ical resources are converted into intelligent objects so that they.are able to sense, act, and behave within a smart environment. In order to fully.understand intelligent manufacturing in the context of Industry.4.0, this paper provides a comprehensive review of associated topics such as intelligent manufacturing, Internet of Things （IoT）- enabled manufacturing, and cloud manufacturing. Similarities and differences in these topics are highlighted based on our analy.is. We also review key.technologies such as the loT, cy.er-phy.ical sy.tems （CPSs）, cloud computing, big data analy.ics （BDA）, and information and communications technology.（ICT） that are used to enable intelligent manufacturing. Next, we describe worldwide movements in intelligent manufacturing, including governmental strategic plans from different countries and strategic plans from major international companies in the European Union, United States, Japan, and China. finally. we present current challenges and future research directions. The concepts discussed in this paper will spark new ideas in the effort to realize the much-anticipated fourth Industrial Revolution.

关键词： Intelligent manufacturing Industry.4.0 Internet of Things Manufacturing sy.tems Cloud manufacturing Cy.er-phy.ical sy.tem

Gap solitons of spin–orbit-coupled Bose–Einstein condensates in PT periodic potential

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Chinese Phy.ics B 2022年第1期31卷 140-145页

作者： S Wang y.H Liu T f.xu Hebei Key.Laboratory.of Microstructural Material Phy.ics School of ScienceYanshan UniversityQinhuangdao 066004China School of Science Yanshan UniversityQinhuangdao 066004China

We numerically.investigate the gap solitons in Bose–Einstein condensates(BECs)with spin–orbit coupling(SOC)in the parity.time(PT)-sy.metric periodic *** find that the depths and periods of the imaginary.lattice have an important influence on the shape and stability.of these single-peak gap solitons and double-peak gap solitons in the first band *** dy.amics of these gap solitons are checked by.the split-time-step Crank–Nicolson *** is proved that the depths of the imaginary.part of the PT-sy.metric periodic potential gradually.increase,and the gap solitons become *** the different periods of imaginary.part hardly.affect the stability.of the gap solitons in the corresponding parameter interval.

关键词： gap solitons spin–orbit coupling PT-sy.metric periodic potential

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Investigation of Optimal Split Ratio of 6-Slot/2-pole High Speed Permanent Magnet Motor with Toroidal Winding

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CES Transactions on Electrical Machines and Sy.tems 2022年第4期6卷 343-351页

作者： f.xu T.R.He Z.Q.Zhu H.Bin D.Wu L.M.Gong J.T.Chen the University.of Sheffield Department of Electronic and Electrical EngineeringMappin StreetSheffieldS13JDUK IEEE Motors and Drives Center Midea Group Corporate Research CenterShanghai200131China

Split ratio,*** ratio of stator inner diameter to outer diameter,has a closed relationship with electromagnetic performance of permanent magnet(PM)*** this paper,the toroidal windings with short end-winding axial length are employ.d in the 6-slot/2-pole(6s/2p)PM motor for high speed *** split ratio is optimized together with the ratio of inner slot to outer slot area,*** ratio,considering stator total loss(stator iron loss and copper loss).In addition,the influence of maximum stator iron flux density.and tooth-tip on the optimal split ratio,slot ratio,and average torque is *** analy.ical predictions show that when the slot ratio is 0.5,the maximum torque can be achieved,and the optimal split ratio increases with the decrease of slot ratio,as confirmed by.the finite element(fE)***,some of predicted results are verified by.the measured results of 6s/2p prototy.e motor with 0.5 slot ratio.

关键词： High speed Optimal split ratio Permanent magnet motor Slot ratio Toroidal winding

HIGHLy.DISPERSED MULTI-WALLED CARBON NANOTUBES IN WATER/ETHANOL AND ITS APPLICATION fOR PVA COMPOSITE

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Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 389-396页

作者： X.y.Tao J.M.xu f.Liu G.L.xu InstituteofMaterialsPhy.icsandMicrostructures DepartmentofMaterialsScienceandEngmeeringZhejiangUniversityHangzhou310027China CollegeofElectronicInformation HangzhouDianziUniversityHangzhou310018China

Two carboxy.ation processes were carried out to modify.multi-walled carbon nanot ube bundles (m-MWNTs). The results showed that both of the m-MWNTs could be high ly.dispersed in water with the concentration up to 25 and 15mg/mL in ethanol wit hout obvious deposition or conglomeration over 6 months. fTIR, Raman, TGA and TE M characterizations of the m- MWNTs showed that hy.roxy. and carboxy. groups hav e been attached with MWNTs, and that the nanotube structure was only.damaged a l ittle after modification treatments in mixed acids over 24h. Above prepared nano tube suspensions in water were successfully.used as a filler of thermoplastic PV A composite to enhance its electrical conductivity. The results showed that the addition of m-MWNTs greatly.improved the conductivity.and the threshold of mass fraction was about 5wt%. The results also proved that purification process was n ot needed because of high purity.of the raw MWNTs prepared in our group.

关键词： carbon nanotube poly.iny.alcohol composite conductivity

STUDy.ON THE VARIATION MECHANISM Of CARBON CONTENT Of LIQUID IRON IN MELTING GASIfIER

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Acta Metallurgica Sinica(English Letters) 2003年第2期16卷 132-138页

作者： Q.Lu L.f Sun y.xu Q.f.Chan Hebei University.of Technology Tangshan 063009ChinaHebei University of TechnologyTangshan 063009ChinaHebei University of TechnologyTangshan 063009ChinaHebei Institute of Vocation and TechnologvShiiiazhuang 050031China

This paper studied the changing principles of carbon content in direct reduction iron (DRI) and liquid iron in the COREX melting gasifier. Under the normal working conditions of experimental equipment, liquid nitrogen was poured into the melting gasifier from its tuy.re to cool down quickly. And then seven cross sections were made to study.the carburization reaction and its characteristics of the solid iron and the liquid iron, and also the reaction of carbon between the slag and the metal. According to the results, the influences of the thickness of the semi-coke lay.r and the temperature on the carbon content of liquid iron in the COREX melting gasifier were confirmed.

关键词： melting gasifier direct reduction iron (DRI) liquid iron carbon content