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Microstructural evolution and mechanical properties of FeCoCrNiCu high entropy alloys:a microstructure-based constitutive model and a molecular dynamics simulation study

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Applied Mathematics and Mechanics(English Edition) 2021年第8期42卷 1109-1122页

作者： Gangjie LUO Li LI Qihong FANG Jia LI Yuanyuan TIAN Yong LIU Bin LIU Jing PENG P.K.LIAW College of Mechanical and Vehicle engineering Hunan UniversityChangsha 410082China State Key Laboratory for Powder Metallurgy Central South UniversityChangsha 410083China department of Materials Science and engineering The University of TennesseeKnoxvilleTN 37996U.S.A.

High entropy alloys(HEAs)attract remarkable attention due to the excellent mechanical ***,the origins of their high strength and toughness compared with those of the traditional alloys are still hardly ***,using a microstructure-based constitutive model and molecular dynamics(MD)simulation,we investigate the unique mechanical behavior and microstructure evolution of FeCoCrNiCu HEAs during the *** to the interaction between the dislocation and solution,the high dislocation density in FeCoCrNiCu leads to strong work *** slip systems are stimulated,leading to the good plasticity of *** plastic deformation of FeCoCrNiCu is basically affected by the motion of dislocation *** prismatic dislocation loops inside FeCoCrNiCu are formed by the dislocations with the Burgers vectors of a/6[112]and a/6[112],which interact with each other,and then emit along theslip *** addition,the mechanical properties of FeCoCrNiCu HEA can be predicted by constructing the microstructure-based constitutive model,which is identified according to the evolution of the dislocation density and the stress-strain *** dislocation strengthening and remarkable lattice distortion strengthening occur in the deformation process of FeCoCrNiCu,and improve the ***,the origins of high strength and high toughness in FeCoCrNiCu HEAs come from lattice distortion strengthening and the more activable slip systems compared with *** results accelerate the discovery of HEAs with excellent mechanical properties,and provide a valuable reference for the industrial application of HEAs.

关键词： molecular dynamics(MD)simulation microstructure-based constitutive model high entropy alloy(HEA) deformation behavior

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Robust force tracking control via backstepping sliding mode control and virtual damping control for hydraulic quadruped robots

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Journal of Central South University 2020年第9期27卷 2673-2686页

作者： SHEN Wei Lü Xiao-bin MA Chen-jun department of mechatronics engineering University of Shanghai for Science and TechnologyShanghai 200093China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310000China Libin Technology R&D Center Shanghai Electric Hydraulic&Pneumatics Co.Ltd.Hangzhou 310000China

In order to improve the force tracking performance of hydraulic quadruped robots in uncertain and unstructured environments,an impedance-based adaptive reference trajectory generation scheme is ***,in order to improve the robustness to environmental changes and reduce the contact force errors caused by trajectory tracking errors,the backstepping sliding mode controller is combined with the adaptive reference trajectory ***,a virtual damping control based on velocity and pressure feedback is proposed to solve the problem of contact force disappearance and stall caused by sudden environmental *** simulation results show that the proposed scheme has higher contact force tracking accuracy when the environment is unchanged;the contact force error can always be guaranteed within an acceptable range when the environment is reasonably changed;when the environment suddenly changes,the drive unit can move slowly until the robot re-contacts the environment.

关键词： hydraulic quadruped robot impedance control backstepping sliding mode control virtual damping control

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The progress and perspective of strategies to improve tumor penetration of nanomedicines

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Chinese Chemical Letters 2021年第4期32卷 1341-1347页

作者： Jiang Hu Xinwei Yuan Fei Wang Huile Gao Xilin Liu Wei Zhang department of Orthopedics Sichuan Provincial People's Hospital&Sichuan Academy of Medical Sciences&Affiliated Hospital of University of Electronic Science and TechnologyChengdu 610072China Key Laboratory of Drug Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial TechnologyWest China School of Pharmacy Sichuan UniversityChengdu 610041China

Tumor penetration is important for effectively tumor targeting drug ***,many researches are published to overcome the barriers that restrict tumor penetration and improve drug delivery *** the mini review,we first analyzed the barriers influence the tumor penetration,including tumor microenvironment barriers,nanoparticle properties,and interaction barriers between tumor and *** overcome the barrier,several strategies are developed,including modulating tumor microenvironment,changing particle size,transcytosis enabled tumor penetration,cell penetrating peptide modification and overcoming binding site barrier,which could effectively improve tumor penetration,and finally enhance tumor treatment outcome.

关键词： Tumor penetration Tumor microenvironment Size changeable Cell penetrating peptide Nanoparticles

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Liquid Metal Fibers

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Advanced Fiber Materials 2022年第5期4卷 987-1004页

作者： Hongzhang Wang Ruofan Li Yingjie Cao Sen Chen Bo Yuan Xiyu Zhu Jiashu Cheng Minghui Duan Jing Liu department of Biomedical engineering School of MedicineTsinghua UniversityBeijing 100084China Beijing Key Lab of Cryobiomedical engineering and Key Lab of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Liquid metal(LM)is a type of metal or alloy that has a low melting point near room temperature and exhibits the properties of both liquids and *** unconventional materials have been gaining increasing attention within the scientific and industrial ***,fiber-shaped LM and its composites have especially attracted diverse interest owing to their unique merits,such as excellent conductivity,intrinsic stretchability,facile phase transition,and the ability to be woven or knitted into smart *** review is dedicated to summarizing different aspects of LM-based fibers,such as their material components,fabrication and design strategies,and remarkable applications by way of their representative *** fabrication approaches,such as 3D printing of pure LM wire,coating the LM shell on the surface of the fiber,injecting a LM core into hollow fibers,and spinning of LM and polymer hybrids have been comparatively ***,emerging applications that primarily utilize LM fibers have been ***,future directions and opportunities in the field are *** categorization of LM fibers is expected to facilitate further investigation and practice in the coming society.

关键词： Liquid metal Stretchable and conductive fibers Smart fabrics Wearable electronics Health monitoring

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Isolation of Thermally Stable Cellulose Nanocrystals from Spent Coffee Grounds via Phosphoric Acid Hydrolysis

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Journal of Renewable Materials 2020年第2期8卷 187-203页

作者： Brody A.Frost E.Johan Foster Virginia Tech Department of Materials Science and EngineeringMacromolecules Innovation Institute117 SurgeVirginia TechBlacksburgVA 24061USA

As the world's population exponentially grows,so does the need for the production of food,with cereal production growing annually from an estimated 1.0 billion to 2.5 billion tons within the last few *** rapid growth in food production results in an ever increasing amount of agricultural wastes,of which already occupies nearly 50%of the total landfill *** example,is the billions of dry tons of cellulose-containing spent coffee grounds disposed in landfills *** paper seeks to provide a method for isolating cellulose nanocrystals(CNCs)from spent coffee grounds,in order to recycle and utilize the cellulosic waste material which would otherwise have no *** have already been shown to have vast applications in the polymer engineering field,mainly utilized for their high strength to weight ratio for reinforcement of polymer-based nanocomposites.A successful method of purifying and hydrolyzing the spent coffee grounds in order to isolate usable CNCs was *** CNCs were then characterized using current techniques to determine important chemical and physical properties.A few crucial properties determined were aspect ratio of 12±3,crystallinity of 74.2%,surface charge density of(48.4±6.2)mM/kg cellulose,and the ability to successfully reinforce a polymer based *** characteristics compare well to other literature data and common commercial sources of CNCs.

关键词： Cellulose nanocrystals phosphoric acid hydrolysis agricultural waste industrial waste spent coffee grounds polymeric nanocomposites renewable cellulosic materials

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Optimizing the micro-arc oxidation (MAO) parameters to attain coatings with minimum porosity and maximum hardness on the friction stir welded AA6061 aluminium alloy welds

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Defence Technology（防务技术） 2017年第2期13卷 111-117页

作者： R. Kamal Jayaraj S. Malarvizhi V. Balasubramanian Centre for Materials Joining and Research(CEMAJOR) Department of Manufacturing EngineeringAnnamalai UniversityAnnamalai Nagar608 002Tamil NaduIndia

Micro-arc oxidation(MAO) technique is capable of producing dense oxide films on the aluminium alloy surface. This oxide film protects the aluminium alloy from the corrosion attack for longer *** relationships were derived to evaluate the MAO coating properties(porosity and hardness) by incorporating very important MAO parameters(current density, inter-electrode distance and oxidation time). MAO parameters were also optimized to achieve coatings with minimum porosity and maximum hardness. Further, the effect of MAO parameters on coating characteristics was analysed. From the results, it is found that the current density has greater influence on the responses than the other two parameters.

关键词： Micro-arc oxidation Aluminium alloy Friction stir weld Response surface methodology

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Mining and validation of novel genotyping-bysequencing(GBS)-based simple sequence repeats(SSRs)and their application for the estimation of the genetic diversity and population structure of coconuts(Cocos nucifera L.)in Thailand

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Horticulture Research 2020年第1期7卷 717-732页

作者： Kanamon Riangwong Samart Wanchana Wanchana Aesomnuk Chatree Saensuk Phakchana Nubankoh Vinitchan Ruanjaichon Tippaya Kraithong Theerayut Toojinda Apichart Vanavichit Siwaret Arikit department of Biotechnology Faculty of Engineering and Industrial TechnologySilpakorn UniversitySanamchandra Palace CampusNakhon Pathom 73000Thailand National Center for Genetic engineering and Biotechnology(BIOTEC) National Science and Technology Development Agency(NSTDA)Khlong LuangPathum Thani 12120Thailand Center for Agricultural Biotechnology Kasetsart UniversityKamphaeng Saen CampusNakhon Pathom 73140Thailand Rice Science Center Kasetsart UniversityKamphaeng Saen CampusNakhon Pathom 73140Thailand Chumphon Horticultural Research Center Department of AgricultureBangkok 10900Thailand department of Agronomy Faculty of Agriculture at Kamphaeng SaenKasetsart UniversityKamphaeng Saen CampusNakhon Pathom 73140Thailand

Coconut(Cocos nucifera L.)is an important economic crop in tropical ***,the lack of a complete reference genome and the limitations of usable DNA markers hinder genomic studies and the molecular breeding of ***,we present the results of simple sequence repeat(SSR)mining from a high-throughput genotyping-bysequencing(GBS)study of a collection of 38 coconut accessions.A total of 22,748 SSRs with di-,tri-,tetra-,penta-and hexanucleotide repeats of five or more were identified,2451 of which were defined as polymorphic loci based on locus clustering in 38 coconut accessions,and 315 loci were suitable for the development of SSR *** hundred loci were selected,and primer pairs for each SSR locus were designed and validated in 40 coconut *** analysis of 74 polymorphic markers identified between 2 and 9 alleles per locus,with an average of 3.01 *** assessment of the genetic diversity and genetic relationships among the 40 coconut varieties based on the analysis of population structure,principal coordinate analysis(PCoA),and phylogenetic tree analysis using the 74 polymorphic SSR markers revealed three main groups of coconuts in *** identified SSR loci and SSR markers developed in this study will be useful for the study of coconut diversity and molecular *** SSR mining approach used in this study could be applied to other plant species with a complex genome regardless of the availability of reference genome.

关键词： breeding structure sequence

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Novel Membranes Regenerated from Blends of Cellulose/Gluten Using Ethylenediamine/Potassium Thiocyanate Solvent System

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Journal of Renewable Materials 2019年第1期7卷 41-55页

作者： Yang Yu Ramiz Boy Richard Kotek Fiber and Polymer Science Program College of TextilesNorth Carolina State UniversityRaleighNC 27606USA department Textile engineering Çorlu Faculty of EngineeringTekirdağNamık Kemal UniversityTekirdağ59860TURKEY

Current industrial methods for dissolution of cellulose in making regenerated cellulose products are relatively expensive,toxic and dangerous and have environmental problems coming with the hazard chemical *** solve these problems,a novel ethylenediamine and potassium thiocyanate(ED/KSCN)solvent system was developed,that is economical,ecofriendly,and highly *** ED/KSCN solvent system was proven to be a suitable solvent for fabricating cellulose(blended with other polymers)*** this study,gluten was used to develop nonporous membranes with *** method of casting these membranes provided better ones than the former researchers’*** composite membranes’physical and mechanical properties were studied by analysis of morphology,viscosity,crystallinity,thermal behaviors,tensile properties and water absorption of *** showed that membranes are nonporous,uniform,strong,flexible,ecofriendly and *** and physical properties were influenced by the ratio of cellulose/*** blending 40% gluten,the tensile strength of cellulose membrane dropped to 15.89 MPa from 35.11 ***,its elongation at break increased from 35.3% to 57.02% accordingly.

关键词： Cellulose gluten blended film novel ED/KSCN solvent physical and mechanical properties

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Quasi-Static Flexural Properties of a Pultruded Glass Fiber/Unsaturated Polyester Square Pipe

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Open Journal of Composite Materials 2019年第3期9卷 271-284页

作者： Yuri Imai Gabriel Fortin Badin Pinpathomrat Keigo Nishitani Anin Memon Yuqiu Yang Akio Ohtani Hiroyuki Hamada department of Advanced Fibro-Science Kyoto Institute of Technology Kyoto Japan department of industrial engineering Faculty of Engineering Rajamangala University of Technology Thunyaburi Phathumtani Thailand Key Laboratory of Textile Science & Technology Ministry of Education College of Textiles Donghua University Shanghai China

This paper explores quasi-static flexural properties and fracture behavior of a pultruded glass fiber/unsaturated polyester square pipe for automotive structural applications. Three-point flexural testing is performed in an Instron Universal Testing Machine with steel jigs supporting the top and bottom surfaces of the pipe. Acoustic emission (AE) measurements are recorded during flexural testing to evaluate initial fracture in the pipe structure. After final fracture, five cross-sections of the pipe are cut at 50-mm intervals along the longitudinal axis, with the first cut located at the mid-span of the pipe. Cross-sections of a pipe from an interrupted test where initial fracture is detected from the AE method are also prepared. Damage locations and behavior on each cross-section are observed. The flexural testing results show that the cumulative AE counts increase rapidly from 2.5 kN, that final failure occurs at a maximum load of approximately 13 kN, and that corresponding initial and final failure occurs in the two corner regions on the compressive side of flexural loading. Failure initiates by stress concentrations due to the upper jig on the top surface during bending. The cross-sectional observations also reveal clear deformation behavior of the pipe where failure is present, marked by inward bending of the top surface and upper corners located on the compressive side, near the jig. The locations of maximum stresses and deformations obtained from finite element analysis of this pipe structure are in very good agreement with the experimental observations.

关键词： Automotive Composites Flexural Testing Pultruded Pipe Mechanical Strength Fracture Behavior

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Biological decomposition of Na_2S_2O_3 into sulfur by a newly isolated facultative thermophilic alkaline desulphuricant strain

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Science China Chemistry 2009年第2期52卷 226-230页

作者： ZHANG JianBin1,ZHANG Tong2,MA Kai2,ZHANG PengYan2,LI Qiang2 & WEI XiongHui1 1 department of Applied Chemistry,College of Chemistry & Molecular engineering,Peking University,Beijing 100190,China 2 College of Chemical engineering,Inner Mongolia University of Technology,Huhhot 010051,China 1. department of Applied Chemistry College of Chemistry & Molecular Engineering Peking University Beijing 100190 China 2. College of Chemical engineering Inner Mongolia University of Technology Huhhot 010051 China

A facultative thermophilic alkaline desulphuricant strain named GDJ-3 was isolated from neutral soils,enriched on sulfur synthetic medium,and detected in previous *** and chemotax-onomic analyses and 16s RNA gene sequencing showed that the strain was in good agreement with Alpha proteobacterium sp.(97%) and ochrobactrum sp.(98%).The regenerative processes of the solu-tion containing sulfur compounds(SCS) from the strain through an orthogonal test were investigated to get the optimum regenerative *** results showed that regenerative temperature,air flow,and stirring speed of the agitator were the main three variables influencing the regenerative processes of the *** optimum regenerative efficiency of the SCS from the strain was obtained when tem-perature,air flow,and stirring speed of the agitator were 318.2 K,3.0 L/min,and zero r/min,*** this condition,when the cell concentration of the strain was adjusted to 107/mL,the concentra-tions of Na2S2O3 and Na2S in the SCS decreased from 112.68 g/L to 96.88 g/L and from 0.87 g/L to 0.11 g/L in 9.5 ***,XRD spectrum shows that sulfur was formed in the regeneration *** results suggest that the strain has potential application to the regeneration of the industrial so-lution containing sulfur compounds.

关键词： bio-desulfurization thermophiles optimization biocomposition orthogonal test

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