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Bond-associated non-ordinary state-based peridynamic model for multiple spalling simulation of concrete

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Acta Mechanica Sinica 2021年第7期37卷 1104-1135,I0002页

作者： Siyang Yang xin gu Qing Zhang Xiaozhou Xia Department of Engineering Mechanics College of Mechanics and MaterialsHohai UniversityNanjing 211100China

The non-ordinary state-based peridynamic(NOSB PD)model has the capability of incorporating existing constitutive relationships in the classical continuum *** the present work,we first develop an NOSB PD model corresponding to the Johnson–Holmquist II(JH-2)constitutive damage model,which can describe the severe damage of concrete under intense impact ***,the numerical oscillation problem of the NOSB PD caused by zero-energy mode is analyzed and hence a bond-associated non-ordinary state-based peridynamic(BA-NOSB PD)model is adopted to remove the ***,the elastic deformation of a three-dimensional bar is analyzed to verify the capability of BA-NOSB PD in eliminating the numerical ***,concrete spalling caused by the interaction of incident compression wave and reflected tension wave is *** dynamic tensile fracture process of concrete multiple spalling is accurately reproduced for several examples according to the spalling number and spalling thickness analysis,illustrating the approach can well simulate and analyze the concrete spalling discontinuities.

关键词： Non-ordinary state-based peridynamics Bond-associated horizon-Johnson-HolmquistⅡ(JH-2)model Wave propagation Multiple spalling

Intrinsic contractivity properties of Feynman-Kac semigroups for symmetric jump processes with infinite range jumps

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Frontiers of Mathematics in China 2015年第4期10卷 753-776页

作者： xin CHEN jian WANG Department of Mathematics Shanghai Jiao Tong University Shanghai 200240 China School of Mathematics and Computer Science Fujian Normal University Fuzhou 350007 China

Let （Xt）t≥0 be a symmetric strong Markov process generated by non-local regular Dirichlet form （D, （D）） as follows：where J（x, y） is a strictly positive and symmetric measurable function on Rd × Rd. We study the intrinsic hypercontractivity, intrinsic supercontractivity, and intrinsic ultracontractivity for the Feynman-Kac semigroup

关键词： Symmetric jump process Levy process Dirichlet form Feynman-Kac semigroup intrinsic contractivity

Wearable multifunctional organohydrogel-based electronic skin for sign language recognition under complex environments

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Journal of Materials Science & Technology 2024年第14期181卷 91-103页

作者： Bin Song Xudong Dai xin Fan Haibin gu Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan UniversityChengdu610065China National Engineering Laboratory for Clean Technology of Leather Manufacture Sichuan UniversityChengdu610065China Univ Elect Sci&Technol China Sch Comp Sci&EngnChengdu611731China

Language barrier is the main cause of *** language,which is a common language in all the worldwide language families,is difficult to be entirely popularized due to the high cost of learning as well as the technical barrier in real-time *** solve these problems,here,we constructed a wearable organohydrogel-based electronic skin(e-skin)with fast self-healing,strong adhesion,extraor-dinary anti-freezing and moisturizing properties for sign language recognition under complex *** e-skin was obtained by using an acrylic network as the main body,aluminum(III)and bay-berry tannin as the crosslinking agent,water/ethylene glycol as the solvent system,and a polyvinyl al-cohol network to optimize the network *** this e-skin,a smart glove was further built,which could carry out the large-scale data collection of common gestures and sign *** the help of the deep learning method,specific recognition and translation for various gestures and sign lan-guages could be *** accuracy was 93.5%,showing the ultra-high classification accuracy of a sign language *** short,by integrating multiple characteristics and combining deep learning technology with hydrogel materials,the e-skin achieved an important breakthrough in human-computer interaction and artificial intelligence,and provided a feasible strategy for solving the dilemma of mutual exclusion between flexible electronic devices and human bodies.

关键词： Sign language recognition Conductive organohydrogel Electronic skin Strain sensor Self-healing Freezing resistance

Rapid self-healing,self-adhesive,anti-freezing,moisturizing,antibacterial and multi-stimuli-responsive PVA/starch/tea polyphenol-based composite conductive organohydrogel as flexible strain sensor

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Journal of Materials Science & Technology 2023年第4期135卷 199-212页

作者： Tao Ke Li Zhao xin Fan Haibin gu Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan UniversityChengdu 610065China National Engineering Research Center of Clean Technology in Leather Industry Sichuan UniversityChengdu 610065China

The complexity of application environment stimulates the development of wearable devices based on functional *** all the promising performances,self-healing and self-adhesion properties are ideal for hydrogel sensors,which can guarantee good accuracy,comfort and long service ***,it is still a challenge to achieve simultaneous self-healing and self-adhesion in different environments(in the air,underwater and at low temperatures).Herein,a feasible new strategy was successfully carried out to prepare a starch-based composite conductive organohydrogel based on the reversible borate ester bonds formed by complexing starch/polyvinyl alcohol(PVA)/tea polyphenol(TP)with borax,and multiple hydrogen-bond interactions among PVA,starch,TP and ethylene glycol(EG).Silver nanoparticles(Ag-NPs),reduced and stabilized by TP,and MWCNTs(multi-walled carbon nanotubes)were introduced into the cross-linking networks to endow the resulting PBSTCE organohydrogel with considerable antibacterial property and conductivity,*** organohydrogel possessed rapid self-healing(HE(self-healing efficiency)=96.07%in 90 s,both in the air and underwater,also at-20℃),considerable self-adhesion(both in the air and underwater,also at-20℃),remarkable stretchability(814%of elongation),anti-freezing(-20℃)and moisture-retention abilities,antibacterial activity,sensitive pH/sugar-responsiveness,and *** strain sensor formed by the PBSTCE organohydrogel can not only effectively record large-scale human motions(***/wrist/elbow bending,walking,etc.),but also accurately capture subtle motion changes(***,chewing,swallowing,speaking,smiling and frowning).Moreover,the self-healed organohydrogel sensor also exhibited almost invariable mechanical,electrical and sensing *** work demonstrates a feasible strategy to construct multifunctional starch-based organohy-drogels,and promotes their efficient,stable and eco-friendly application as flexible wearabl

关键词： Conductive organohydrogel Strain sensor Self-healing Self-adhesive Anti-freezing Antibacterial

Product Specification Analysis for Modular Product Design Using Big Sales Data

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Chinese Journal of Mechanical Engineering 2023年第1期36卷 19-33页

作者： jian Zhang Bingbing Li Qingjin Peng Peihua gu Department of Mechanical Engineering Shantou UniversityShantou515063China Department of Mechanical Engineering University of ManitobaManitobaR3T 5V6Canada International Institute for Innovative Design and Intelligent Manufacturing of Tianjin University Shaoxing312000China School of Mechanical Engineering Tianjin UniversityTianjin300350China

Big data on product sales are an emerging resource for supporting modular product design to meet diversified customers’requirements of product specification *** better facilitate decision-making of modular product design,correlations among specifications and components originated from customers’conscious and subconscious preferences can be investigated by using big data on product *** study proposes a framework and the associated methods for supporting modular product design decisions based on correlation analysis of product specifications and components using big sales *** correlations of the product specifications are determined by analyzing the collected product sales *** building the relations between the product components and specifications,a matrix for measuring the correlation among product components is formed for component *** rules for supporting the decision making of modular product design are proposed based on the frequency analysis of the specification values per component cluster.A case study of electric vehicles illustrates the application of the proposed method.

关键词： Modular product design Customer preference Product specifications Correlation analysis Big sales data Electric vehicle

Vapor-assisted epitaxial growth of porphyrin-based MOF thin film for nonlinear optical limiting

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Science China Chemistry 2020年第8期63卷 1059-1065页

作者： Yi-Hong Xiao Zhi-Gang gu jian Zhang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100049China

Fabrication of metal-organic frameworks(MOFs)thin films has been an efficient way to expand their functionalities and ***,we use the vapor-assisted deposition(VAD)method to epitaxially grow a porphyrin-based MOF PCN-222 *** is,vapor source assists to deposit pre-treated precursor solution on quartz substrate to form a continuous PCN-222 ***,utilizing the post-treated encapsulation of functional carbon-based nanoparticles,the carbon nanodots(CND)and Pt doped CND(Pt/CND)are well loaded into the pores of PCN-222 film,the size(~3.1 nm)of which is highly close to the pore size of the corresponding MOF(~3.7 nm).The Z-scan results reveal that PCN-222 film exhibits high reverse saturable *** addition,encapsulation of carbon based nanodots into PCN-222 film could enhance the nonlinear optical limiting effect benefiting from the host-guest *** study serves to present both the available toolbox of thin film preparation and high potential for precise synthetic nanocomposite films in optical limiting devices.

关键词： metal-organic framework epitaxial growth porphyrin thin film nonlinear optical property

The role of Debye mass in the chiral crossover in a strong magnetic field

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Communications in Theoretical Physics 2022年第10期74卷 68-75页

作者： Jia Zhang xin-jian Wen Institute of Theoretical Physics State Key Laboratory of Quantum Optics and Quantum Optics DevicesShanxi UniversityTaiyuanShanxi 030006China

In this paper,the Debye mass of quarks is investigated in the Nambu–Jona-Lasinio model at zero and nonzero chemical *** a uniform plasma,the Debye mass usually behaves as a monotonous increasing function of the temperature,the chemical potential and the magnetic *** the fixed coupling interaction G,we find that the magnetic catalysis(MC)on the occurrence of the chiral restoration could be revealed by the susceptibility of the Debye mass dmD/dT at low chemical potential and by the quantity TdmD/dT in the region of moderate ***,the inverse MC is realized under a thermomagnetic coupling constant G(B,T)by the behavior of the Debye mass at both zero and nonzero chemical potentials.

关键词： chiral restoration strong magnetic field Debye mass Nambu-Jona-Lasinio

Cytokines that target immune killer cells against tumors

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Cellular & Molecular Immunology 2020年第7期17卷 722-727页

作者： jian Qiao Yang-xin Fu The Department of Pathology University of Texas Southwestern Medical CenterDallasTX 75235USA

T-cell-stimulating cytokines have shown promise as monotherapies or in combination with other therapeutic modalities for immunotherapy of ***,their efficacy is limited due to their short half-life,pleiotropic roles,and induction of severe toxicity even at therapeutic *** overcome these major therapeutic barriers,cytokine-based products are being further developed to improve their therapeutic *** approaches include manipulating their activity to preferentially bind to effector immune cells rather than immune-suppressive cells,prolonging their half-life in vivo and modifying them to target *** review focuses on IL-2,IL-15,and IL-10,which have potent effects on immune cells that mediate effective antitumor *** will summarize the recent progress of these cytokines in both preclinical studies and selective clinical applications and will discuss our perspectives on the development of new strategies to potentiate cytokine-based immunotherapy.

关键词： IL-2 IL-15 IL-10 cytokine therapy cancer

Fatigue life research and experimental verification of superalloy thin-walled structures subjected to thermal-acoustic loads

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Chinese Journal of Aeronautics 2020年第2期33卷 598-608页

作者： jian WANG Fengtong ZHAO Yundong SHA Song gu Department of Aircraft Maintenance Engineering Chengdu Aeronautic PolytechnicChengdu 610100China Liaoning Key Laboratory of Advanced Test Technology for Aeronautical Propulsion System Shenyang Aerospace UniversityShenyang 110136China

Rapid alternating stress is formed in structure subjected to harsh thermal-acoustic loads,which will affect fatigue performance and reduce fatigue life ***,fatigue experiment of superalloy thin-walled structure was carried out to obtain fatigue damage location and failure time of the experiment specimen,and S-iN curves of superalloy thin-walled structure at 723 K were ***,dynamic response simulation of superalloy thin-walled structure under the same load as experiment was implemented,and fatigue life was estimated based on the fatigue life prediction model which mainly included:improved rain-flow counting method,Morrow average stress model and Miner linear cumulative damage ***,comparisons between simulation solutions and experimental results achieved a consistency,which verified the validity of the Fatigue Life Prediction Model(FLPM).Moreover,taking a rectangle plate as the analysis object,the distributions of Fain-low circulation blocks and damage levels of the structure were discussed ***,current research indicates that in pre-buckling the structure is in softened area and fatigue life decreases with the increase of temperature;in post-buckling the structure is in hardened area and fatigue life increases with the increase of temperature within a certain range.

关键词： Experimental verification Fatigue life Improved rain-flow counting method Rain-flow cycle matrix Rain-flow damage matrix Thermal-acoustic load Thin-walled structures