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Science china chemistry 2018年第1期61卷 46-53页

作者： Guangcui yuan charles c.Han center for Neutron Research National Institute of Standards and Technology USA Department of Polymer Engineering The University of Akron Institute for Advanced Study Shenzhen University

Glass transition involves a many-body interaction and relaxation process. The splk of relaxation spectrum and the extremely slow dynamics bring into considerations of non-linearity and non-equilibrium. Some of our recent findings in two measurable colloidal systems are reviewed, one with a simple attractive interparticle potential and the other with a competitive （repulsive vs. attractive） inter-particle interaction. With an approach from interaction potential changes to the corresponding structural and relaxation responses, along the path of reaching the final equilibrium, we illustrate some interesting physics in glass formation process. Also, some reviews on the popular glass transition theories are made to remind readers to avoid artifacts and misinterpretations.

关键词： glass transition slow dynamics polymer colloid

Flocking and clustering in mixtures of self-propelled particles with or without active reorientation

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communications in Theoretical Physics 2023年第11期75卷 135-141页

作者： Lu chen z c Tu Department of Physics Beijing Normal UniversityBeijing 100875China complex Systems Division Beijing Computational Science Research CenterBeijing 100193China

We study phase behaviors of mixtures comprising active particles with and without active reorientation by varying mixing *** observe that the order parameter characterizing flocking in the steady state exhibits a linear decrease with an increase in mixing *** the order parameter characterizing clustering in the steady state presents a sharp leap as the mixing ratio ***,we obtain phase diagrams of flocking under different mixing ratios and observe that the domain corresponding to flocking experiences a contraction with the increase of mixing ***,the coordinates of the critical point on the phase boundary between the flocking and the disordered phase decay exponentially with the mixing ratio.

关键词： active matter flocking clustering binary system

Binary doping of nitrogen and phosphorus into porous carbon: A novel di-functional material for enhancing cO_(2) capture and super-capacitance

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Journal of Materials Science & Technology 2022年第4期99卷 73-81页

作者： yuan Wang Jianfei Xiao Hanzhi Wang Tian c.zhang Shaojun yuan Low-carbon Technology&chemical Reaction Engineering Lab College of Chemical EngineeringSichuan UniversityChengdu 610065China civil&Environmental Engineering Department University of Nebraska-LincolnOmahaNE 68182-0178USA

Designing of hetero-atomic doped carbon-based systems through pyrolysis of abundant element organic precursors is a novel approach to construct rational porous carbon ***,a highly-cross-linked triazine polymer is employed to fabricate N,P co-doped porous carbon(A-TDP-12)with tunable active nitrogen in the carbon framework for simultaneous enhancement of cO_(2) capture capability and Supercapacitance(Sc).The synthesized A-TDP-12 possesses a typical hierarchically porous framework(micro-pores and meso-pores)with a large surface area(1332 m^(2) g^(-1))and a rich content of N(7.89 at.%)and P(0.74 at.%).It delivers a cO_(2) adsorption capacity of 1.52 and 5.68 mmol g^(-1) at 1 and 5 bar,respectively,with almost no decay after successive 8 *** 6 M KOH aqueous electrolyte,A-TDP-12 exhibits a superior specific capacitance of 172.7 F g^(-1) at a current density of 1 A g^(-1).Even at a high current density of 10 A g^(-1),80%of its initial capacity still *** work not only offers a novel strategy for fabricating promising adsorbents and electrodes for cO_(2) uptake and Scs,but also provides new insights into design of porous carbon material for related applications.

关键词： N,P co-doping Porous carbon cO_(2)capture Super-capacitors Bi-function

Four Late-type Galaxies with Double Radio Lobes and Properties of Such Galaxies

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Research in Astronomy and Astrophysics 2024年第4期24卷 84-90页

作者： z.S.yuan X.Y.Gao z.L.Wen J.L.Han National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China cAS Key Laboratory of FAST National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Sciences University of Chinese Academy of SciencesBeijing 100049China

The triggering mechanism for radio lobes from late-type galaxies is not fully *** samples are desired for a thorough investigation and *** utilizing the optical data from the newly released Dark Energy Spectroscopic Instrument imaging surveys and the radio sources from the NRAO VLA Sky Survey and the Faint Images of the Radio Sky at Twenty-centimeter,we identify four Late-type Galaxies with double Radio Lobes(La GRLs):J0217-3645,J0947+6220,J1412+3723 and J1736+*** previously known La GRLs,we confirm the correlation between radio power P_(1.4GHz)and stellar mass M_(*)of host ***(25/35)La GRLs belong to the blue cloud galaxies,while the newly identified cases in this work are located within the region of the red *** find a clear correlation between the differential radio power,i.e.,the offset from the P_(1.4GHz)-M_(*)relation,and the galaxy color,indicating that bluer galaxies at a fixed M_(*)tend to host more powerful radio ***,the majority(31/36)of La GRLs are either located in a galaxy group or displaying a disturbed *** suggest that all of the galaxy mass,color and surrounding environment could play important roles in triggering radio lobes in late-type galaxies.

关键词： galaxies:active galaxies:jets galaxies:spiral radio continuum:galaxies

Shear band evolution and mechanical behavior of cold-rolled zr-based amorphous alloy sheets:An in-situ study

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Journal of Materials Science & Technology 2024年第14期181卷 115-127页

作者： c.Y.zhang z.W.zhu S.T.Li Y.Y.Wang z.K.Li H.Li G.yuan H.F.zhang School of Metallurgy Northeastern UniversityShenyang 110819China Shi-changxu Innovation center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China The State Key Laboratory of Rolling and Automation(RAL) Northeastern UniversityShenyang 110819China

cold rolling process can regulate the microstructure and mechanical properties of amorphous alloys,but it is still a challenging task to reveal their microscopic ***,we designed an in-situ SEM observation device for the cold rolling process of amorphous alloy,and visually observed the formation and evolution of shear bands during single-pass and multi-pass rolling process of the zr_(55)cu_(30)Al_(10)Ni_(5)amorphous alloy *** is found that the evolution process of shear bands in the rolling process of amorphous alloy shows heritability,which is mainly reflected in two aspects:one is that the shear band formation pattern in the single-pass rolling process is more inclined to inherit the previous shear band formation pattern;the other is that the shear deformation is more likely to occur in the pre-existing shear bands in the multi-pass rolling *** rule can be used to guide the controlled genera-tion of shear bands in amorphous ***,we emphasized the importance of pre-existing shear band orientations and systematically investigated the mechanical behavior of the amorphous alloys with pre-existing shear bands by in-situ SEM *** is found that the mechanical properties of the as-rolled amorphous alloys are determined by the competition between the work-softening of the pre-existing shear band itself and the work-hardening caused by the blocking effect of the pre-existing shear bands on the shear *** on this,we enhance the tensile fracture strength and the tensile ductility of the amorphous alloy by adjusting the orientation of the pre-existing shear bands parallel to the tensile stress axis so that the pre-existing shear bands prevent the linear propagation and destruction of the new shear bands.

关键词： Amorphous alloy cold rolling Shear band Mechanical behavior In-situ study Plasticity

Preliminary performance analysis and optimization based on 1D neutronics model for Indian DEMO HccB blanket

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Plasma Science and Technology 2020年第8期22卷 184-191页

作者： D AGGARWAL c DANANI M z YOUSSEF Institute for Plasma Research GandhinagarGujarat 382428India Homi Bhabha National Institute(HBNI) AnushaktinagarMumbai 400094India University of california-Los Angeles Los AngelesCA 90095United States of America

India,under its breeding blanket R&D program for DEMO,is focusing on the development of two tritium breeding blanket concepts;namely the lead-lithium-cooled ceramic breeder and the helium-cooled ceramic breeder(HccB).The study presented in this paper focuses on the neutronic design analysis and optimization from the tritium breeding perspective of the HccB *** Indian concept has an edge-on configuration and is one of the variants of the helium-cooled solid breeder blanket concepts proposed by several partner countries in *** Indian HccB blanket having lithium titanate(Li2TiO3)as the tritium breeder and beryllium(Be)as the neutron multiplier with reduced-activation ferritic/martensitic steel structure aims at utilizing the low-energy neutrons at the rear part of the *** aim of the optimization study is to minimize the radial blanket thickness while ensuring tritium self-sufficiency and provide data for further neutronic design and thermal-hydraulic layout of the HccB *** is found that inboard and outboard blanket thicknesses of 40 cm and 60 cm,respectively,can give a tritium breeding ratio(TBR)>1.3,with 60%6Li enrichment,which is assumed to be sufficient to cover potential tritium losses and associated *** results also demonstrated that the Be packing fraction(PF)has a more profound impact on the TBR as compared to 6Li enrichment and the PF of Li2TiO3.

关键词： DEMO helium-cooled ceramic breeder blanket neutronic optimization study tritium breeding ratio

Environmental and energy gains from using molten magnesium–sodium–potassium chlorides for electro-metallisation of refractory metal oxides

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Progress in Natural Science:Materials International 2015年第6期25卷 650-653页

作者： Wei Li Yating yuan Xianbo Jin Hualin chen George z.chen college of chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan University Department of Rare Metals State Key Laboratory for Separation and Comprehensive Utilization of Rare MetalsGuangdong Key Laboratory for Development and Application of Rare EarthsGuangzhou Research Institute of Non-ferrous Metals Department of chemical and Environmental Engineering Faculty of EngineeringUniversity of Nottingham

The molten eutectic mixture of magnesium,sodium and potassium chlorides(Mg cl2–Na cl–Kcl) has inappreciable solubility for oxide ions,and can help disengage a carbon anode from the oxide ions generated at a metal oxide cathode,and effectively avoid carbon dioxide *** "disengaging strategy" was successfully demonstrated in electro-reduction of solid oxides of zirconium and *** has led to significantly higher current efficiency(93%),and lower energy consumption(1.4 k W h kg 1) in electrolysis of tantalum oxide to tantalum metal compared to the conventional electrolysis in molten calcium chloride(e.g.78% and 2.4 k W h/kg-Ta).

关键词： Electrometallisation Molten salt Tantalum Electro-reduction Magnesium chloride

cadmium sulfide cage photocatalysis coupled electroactive biofilm for synergistic promotion of tetracycline degradation and electricity production

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Journal of Materials Science & Technology 2023年第35期166卷 86-97页

作者： z.S.yuan J.X.zou X.L.zhao J.Y.Shi c.S.Guo M.Yan School of chemistry and chemical Engineering Harbin Institute of TechnologyHarbin 150001China

Tetracycline(Tc)as a common broad-spectrum antibiotic,has been frequently detected in soil and sur-face *** becomes a great threat to the ecological ***,a device of photocatalysis as-sisted microbial fuel cell(photo-MFc)was constructed for Tc degradation and energy *** this photo-MFc,cadmium sulfide(cdS)cage photocatalysis can degrade most of Tc in a short *** the co_(3)O_(4)@c-cc(carbonization and calcination of the zIF-67 precursor in-situ grown on the carbon cloth(cc))bioanode degrades the rest of Tc as well as the photocatalytic products,thus improving the *** co-existence of photocatalysis with bioanode changes the microbial community structure of the *** dominant phylum is Geobacter(60.2%)in normal MFc while that in photo-MFc are Pro-teobacteria(43.5%)and Geobacter(33.2%).Therefore,the synergistic effect of photocatalytic degradation and biodegradation achieves a chemical oxygen demand(cOD)removal of 98.6%,which is higher than that of normal MFc(77.6%)or single cdS cage photocatalysis(23.8%).In addition,the photogenerated electrons can be transferred to the cathode,which reduces their combination with holes and increases the electricity generation of MFc,achieving a maximum power density of 3.37 W/m^(2).After degradation,the effluent with 200 mg L^(−1) Tc exhibits no visible ***,electrochemical test,finite-difference time-domain(FDTD),density functional theory(DFT)calculation and the free radical trapping experiments verify the possible mechanisms of photocatalytic degradation in this *** strat-egy paves a new way for low energy consumption removal and energy recovery of organic pollutants.

关键词： Photo-MFc cdS cage Tetracycline degradation Mineralization Electricity production

Islet separation and islet cell culture in vitro from human embryo-pancreas

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World Journal of Gastroenterology 1999年第5期5卷 458-460页

作者： yuan z Wu GY He YS Shao cM zhan Y Kunming Med coll Dept Histol & Embryol Kunming 650031 Yunnan Province Peoples R China First Affiliated Hosp Kunming Med Coll Dept Nucl Med Kunming 650032 Yunnan Province Peoples R China Kunming Med coll Dept Biol Kunming 650031 Yunnan Province Peoples R China

INTRODUcTIONDiabetes mellitus is the most common disease and its death rate ranks the 8th in the world. Up to now, its incidence has a tendency to increase[1]. Since disorder of sugar metabolism might result in microvascular degeneration and injury of important human organs, it will endanger human health seriously. In 1969, Younszai first reported the method that could decrease diabetes symptoms by islet tissue transplantation. In 1981, our country began to treat diabetes type Ⅰ by transplanting cultured islet tissues. In our study, we digested the pieces of pancreas with collagenase and made morphological observation on islet cells cultured for 3d, 5d, 7d, 9d and 13d respectively, and the contents of insulin and c-peptide in the supernatant were detected by radioimmunoassay. The experimental model of rabbit diabetes was established, and certain curative effect was achieved in the treatment of experimental diabetes in rats.

关键词： cell culture islet cell islets of langerhans transplantetion pancreas/ embryology

Numerical investigation on the flowfield of “swallowtail” cavity for supersonic mixing enhancement

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Acta Mechanica Sinica 2009年第1期25卷 37-44页

作者： c. Wang z. Jiang z. Hu J. Lu Institute or Mechanics. chinese Academy of Sciences 100190 Beijing China RecAPT Gyeongsang National University JinjuKyeongnam 660-701 South Korea

A ＂swallowtail＂ cavity for the supersonic combustor was proposed to serve as an efficient flame holder for scramjets by enhancing the mass exchange between the cavity and the main flow. A numerical study on the ＂swallow- tail＂ cavity was conducted by solving the three-dimensional Reynolds-averaged Navier-Stokes equations implemented with a k-e turbulence model in a multi-block mesh. Turbu- lence model and numerical algorithms were validated first, and then test cases were calculated to investigate into the mechanism of cavity flows. Numerical results demonstrated that the certain mass in the supersonic main flow was sucked into the cavity and moved spirally toward the combustor walls. After that, the flow went out of the cavity at its lateral end, and finally was efficiently mixed with the main flow. The comparison between the ＂swallowtail＂ cavity and the conventional one showed that the mass exchanged between the cavity and the main flow was enhanced by the lateral flow that was induced due to the pressure gradient inside the cavity and was driven by the three-dimensional vortex ring generated from the ＂swallowtail＂ cavity structure.

关键词： Supersonic mixing - Flame holder "Swallowtail" cavity - combustion ignition Numerical simulation