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An interface shear damage model of chromium coating/steel substrate under thermal erosion load

Defence Technology（防务技术） 2021年第2期17卷 405-415页

作者： xiao-long Li Yong Zang Yong lian Min-yu Ma Lei Mu Qin Qin School of Mechanical Engineering University of Science and Technology BeijingBeijing100083China Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing100083China Beijing Key Laboratory for Corrosion Erosion and Surface TechnologyBeijing100083China

The Cr-plated coating inside a gun barrel can effectively improve the barrel’s erosion resistance and thus increase the service ***,due to the cyclic thermal load caused by high-temperature gunpowder,micro-element damage tends to occur within the Cr coating/steel substrate interface,leading to a gradual deterioration in macro-mechanical properties for the material in the related *** order to mimic this cyclic thermal load and,thereby,study the thermal erosion behavior of the Cr coating on the barrel’s inner wall,a laser emitter is utilized in the current *** the help of in-situ tensile test and finite element simulation results,a shear stress distribution law of the Cr coating/steel substrate and a change law of the interface ultimate shear strength are *** have shown that the Cr coating/steel substrate interface’s ultimate shear strength has a significant weakening effect due to increasing *** this study,the interfacial ultimate shear strength decreases from 2.57 GPa(no erosion)to 1.02 GPa(laser power is 160 W).The data from this experiment is employed to establish a Cr coating/steel substrate interface shear damage *** this model is used to predict the flaking process of Cr coating by finite element *** simulation results show that the increase of coating crack spacing and coating thickness will increase the service life of gun barrel.

关键词： Cr coating/steel substrate Thermal erosion Finite element simulation Ultimate shear strength Interface shear damage model

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Suppression of leakage effect of Majorana bound states in the T-shaped quantum-dot structure

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Chinese Physics B 2021年第7期30卷 489-497页

作者： Wei-Jiang Gong Yu-Hang Xue xiao-Qi wang lian-lian Zhang Guang-Yu Yi College of Sciences Northeastern UniversityShenyang 110819China Basic department Yingkou Institute of TechnologyYingkou 115014China

We theoretically study the transport properties in the T-shaped double-quantum-dot structure,by considering the dot in the main channel to be coupled to the Majorana bound state(MBS)at one end of the topological superconducting *** is found that the side-coupled dot governs the effect of the MBS on the transport *** its level is consistent with the energy zero point,the MBS contributes little to the conductance ***,the linear conductance exhibits notable changes according to the inter-MBS coupling *** the absence of inter-MBS coupling,the linear conductance value keeps equal to e^(2)/2 h when the level of the side-coupled dot departs from the energy zero ***,the linear conductance is always analogous to the MBS-absent case once the inter-MBS coupling comes into *** findings provide new information about the leakage effect of MBSs in quantum-dot structures.

关键词： Majorana bound states quantum dots conductance antiresonance

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Synergistic Effects of Solvent Vapor Assisted Spin-coating and Thermal Annealing on Enhancing the Carrier Mobility of Poly(3-hexylthiophene)Field-effect Transistors

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Chinese Journal of Polymer Science 2021年第7期39卷 849-855页

作者： xiao-Lan Qiao Jie Yang lian-He Han Ji-Dong Zhang Mei-Fang Zhua State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

Poly(3-hexylthiophene)(P3HT)thin films,obtained by normal spin-coating and solvent vapor assisted spin-coating(SVASP)before and after thermal annealing(TA),and the corresponding devices were prepared to unravel the microstructure-property relationship,which is of great importance for the development of organic *** SVASP-TA films were used as the active layers of the organic field-effect transistors,a hole mobility up to 0.38 cm^(2)·V^(-1)·s^(-1)was *** mobility was one of the highest values and one order of magnitude higher than that of the normal spin-coating films based *** relationship between the microstructure and the device performance was fully investigated by UV-Vis absorption spectra,grazing incident X-ray diffraction(GIXD),and atomic force microscopy(AFM).The impressive mobility was attributed to the high crystallinity and ordered molecule packing,which stem from the synergistic effects of SVASP and thermal annealing.

关键词： Poly(3-hexylthiophene) Polymer field-effect transistors Microstructure Polymer semiconductors

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Preliminary Study on Drug Susceptibility Profile and Resistance Mechanisms to Macrolides of Clinical Isolates of Non-tuberculous Mycobacteria from China

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Biomedical and Environmental Sciences 2018年第4期31卷 290-299页

作者： LI Fu LI Gui lian PANG Hui LIU Hai Can xiao Tong Yang LI Shuang Jun LUO Qiao JIANG Yi wanG Rui Bai wan Kang Lin State Key Laboratory for Infectious Diseases Prevention and Control Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases National Institute for Communicable Disease Control and Prevention Chinese Center for Disease Control and Prevention Immunology Department Changzhi Medical College Key Laboratory of Laboratory Medicine Wenzhou Medical University

Objective Macrolide susceptibility and drug resistance mechanisms of clinical non-tuberculous mycobacteria（NTM） isolates were preliminarily investigated for more accurate diagnosis and treatment of the infection in China. Methods Four macrolides, including clarithromycin（CLAR）, azithromycin（AZM）, roxithromycin（ROX）, and erythromycin（ERY）, were used to test the drug susceptibility of 310 clinical NTM isolates from six provinces of China with the broth microdilution method. Two resistance mechanisms, 23 S r RNA and erm, were analyzed with nucleotide sequence analysis. Results Varied effectiveness of macrolides and species-specific resistance patterns were observed. Most Mycobacterium abscessus subsp. massiliense were susceptible and all M. fortuitum were highly resistant to macrolides. All the drugs, except for erythromycin, exhibited excellent activities against slow-growing mycobacteria, and drug resistance rates were below 22.2%. Only four highly resistant strains harbored 2,058/2,059 substitutions on rrl and none of other mutations were related to macrolide resistance. G2191 A and T2221 C on rrl were specific for the M. abscessus complex（MABC）. Seven sites, G2140 A, G2210 C, C2217 G, T2238 C, T2322 C, T2404 C, and A2406 G, were specifically carried by M. avium and M. intracellulare. Three sites, A2192 G, T2358 G, and A2636 G, were observed only in M. fortuitum and one site G2152 A was specific for M. gordonae. The genes erm（39） and erm（41） were detected in M. fortuitum and M. abscessus and inducible resistance was observed in relevant sequevar. Conclusion The susceptibility profile of macrolides against NTM was demonstrated. The well-known macrolide resistance mechanisms, 23 S r RNA and erm, failed to account for all resistant NTM isolates, and further studies are warranted to investigate macrolide resistance mechanisms in various NTM species.

关键词： Non-tuberculous mycobacteria Macrolide Drug resistance

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Pig macrophages with site-specific edited CD163 decrease the susceptibility to infection with porcine reproductive and respiratory syndrome virus

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Journal of Integrative Agriculture 2023年第7期22卷 2188-2199页

作者： XU Kui ZHOU Yan-rong SHANG Hai-tao XU Chang-jiang TAO Ran HAO wan-jun LIU Sha-sha MU Yu-lian xiao Shao-bo LI Kui State Key Laboratory of Animal Nutrition/Key Laboratory of Animal Genetics Breeding and Reproduction of Ministry of Agriculture and Rural AffairsInstitute of Animal SciencesChinese Academy of Agricultural SciencesBeijing 100193P.R.China Shenzhen Kingsino Technology Co. Ltd.Shenzhen 518106P.R.China State Key Laboratory of Agricultural Microbiology/Key Laboratory of Preventive Veterinary Medicine in Hubei Province College of Veterinary MedicineHuazhong Agricultural UniversityWuhan 430070P.R.China Precision Medicine Institute The First Affiliated HospitalSun Yat-sen UniversityGuangzhou 510080P.R.China

Porcine reproductive and respiratory syndrome(PRRS)is recognized as one of the most infectious viral diseases of *** Cluster of differentiation 163(CD163)is identified as an essential receptor for mediating PRRS virus(PRRSV)infection,the important residues involved in infection on CD163 are still ***,it is very important to identify these key residues to study the mechanism of PRRSV infection and to generate anti-PRRSV *** this study,we first generated immortalized porcine alveolar macrophage(IPAM)cell lines harboring 40-residues(residues 523-562,including R561(arginine(R)at position 561))deletion of *** infection experiments showed that these IPAM cell lines were completely resistant to PRRSV *** then generated cloned pigs carrying CD163-R561A(an arginine(R)to alanine(A)substitution at position 561 of CD163).PRRSV challenge experiments in porcine alveolar macrophages(PAMs)isolated from the CD163-R561A pigs showed significantly lower susceptibility to PRRSV than that of CD163-R561 *** this study,we show that CD163523-562 contains essential residues for mediating PRRSV infection,and that CD163 R561 significantly contributes to PRRSV infection but is not essential for *** functional sites can therefore serve as new targets for understanding the mechanism of PRRSV ***,CD163-R561A pigs can be used as an important model for improving pig germplasm with resistance against PRRSV.

关键词： pigs porcine alveolar macrophages dual-sgRNA homology-directed repair PRRSV CD163

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Characteristics of phosphorus adsorption by sediment mineral matrices with different particle sizes

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Water Science and Engineering 2013年第3期6卷 262-271页

作者： Yang xiao xiao-lian ZHU Hao-ke CHENG Kai-jie LI Qi LU Dong-fang lianG State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University College of Water Conservancy and Hydropower Engineering Hohai University National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety Hohai University Department of Engineering Mechanics Shanghai Jiao Tong University MOE Key Laboratory of Hydrodynamics Shanghai Jiao Tong University

The particle size of sediment is one of the main factors that influence the phosphorus physical adsorption on sediment. In order to eliminate the effect of other components of sediment on the phosphorus physical adsorption, the sediment mineral matrices were obtained by removing inorganic matter, metal oxides, and organic matter from natural sediments, which were collected from the Nantong reach of the Yangtze River. The results show that an exponential relationship exists between the median particle size （Ds0） and specific surface area （Sg） of the sediment mineral matrices, and the fine sediment mineral matrix sample has a larger specific surface area and pore volume than the coarse sediment particles. The kinetic equations were used to describe the phosphorus adsorption process of the sediment mineral matrices, including the Elovich equation, quasi-first-order adsorption kinetic equation, and quasi-second-order adsorption kinetic equation. The results show that the quasi-second-order adsorption kinetic equation has the best fitting effect. Using the mass conservation and Langmuir adsorption kinetic equations, a formula was deduced to calculate the equilibrium adsorption capacity of the sediment mineral matrices. The results of this study show that the phosphorus adsorption capacity decreases with the increase of Ds0, indicating that the specific surface area and pore volume are the main factors in determining the phosphorus adsorption capacity of the sediment mineral matrices. This study will help understand the important role of sediment in the transformation of phosphorus in aquatic environments.

关键词： sediment mineral matrix " particle size " specific surface area " pore volume phosphorus adsorption

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Microstructure and magnetic performance of Nd–Y–Ce–Fe–B sintered magnets after annealing

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Rare Metals 2022年第3期41卷 859-864页

作者： xiao-lian Liu xiao-Wei Wu Jia-Ying Jin Yong-Ming Tao Xin-Hua wang Mi Yan Key Laboratory of Novel Materials for Sensor of Zhejiang Province College of Materials and Environmental EngineeringHangzhou Dianzi University310018 HangzhouChina School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China State Key Laboratory of Silicon Materials Zhejiang UniversityHangzhou 310027China Key Laboratory of Novel Materials for Information Technology of Zhejiang Province Zhejiang UniversityHangzhou 310027China

Annealing has been widely recognized as a crucial approach to modify the microstructure and enhance the coercivity of Nd–Fe–B magnets. However, in the context of Nd–Y–Ce–Fe–B magnets with multiple rare earths(REs) exhibiting different diffusion behaviors, annealing effects on the magnetic properties become more complicated and remain unknown.

关键词： Microstructure microstructure magnets

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Control of Macrosegregation Behavior by Applying Final Electromagnetic Stirring for Continuously Cast High Carbon Steel Billet

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Journal of Iron and Steel Research International 2013年第11期20卷 13-20页

作者： xiao Chao ZHANG Jiong-ming LUO Yan-zhao WEI xiao-dong WU lian.wan. Shun-xi State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

Solidification behavior of continuously cast high carbon steel billets was investigated with an objective of producing high quality billets by determining the optimum final electromagnetic stirring （F-EMS） parameters. Char- acteristics of centerline segregation were analyzed for lots of billet samples collected from the plant through obtaining the carbon concentrations of drill chips, which were correlated with the operating parameters of the caster and stir- rers, but a problem occurred that segregation control results of trial billets with the same casting and stirring param- eters often have drastic fluctuations. An attempt was made to find out the induced reasons of this problem by meas uring the electromagnetic torque, analyzing the secondary dendrite arm spacing （SDAS） and the corresponding cool- ing rate of the typical specimens, and observing the longitudinal profile of etched billet samples. Then a simple dy- namic secondary cooling model was developed based on the solidified shell thickness control mode, by which the maximum carbon segregation index was reduced effectively, and thus the segregation fluctuation problem was basi- cally solved. Finally, the most favourable stirring parameters were determined as the casting speed of 1.65 m/rain, the liquid core thickness of 40 mm, stirring current of 360 A and frequency of 12 Hz.

关键词： F-EMS carbon segregation index SDAS cooling rate stirring parameter

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Evaluation of the Interface Between Two Plates by the Lamb Wave

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Chinese Physics Letters 2001年第11期18卷 1483-1486页

作者： wanG xiao-Min lian Guo-Xuan LI Ming-Xuan Institute of Acoustics Chinese Academy of SciencesBeijing 100080

A new expression of the dispersion equation of the Lamb wave in an adhesive two-layered plate is presented. The bond rigidity of the adhesive plate is accounted for in terms of a spring model. The influence of the variations of the compliance constants of the spring on the dispersion feature of Lamb modes is numerically studied. The numerical results indicate that the deterioration of the bond rigidity may cause the phase velocity decrease and the frequency-shift for a given Lamb mode, thus having a possibility for the evaluation of the bonding state of the adhesive plate by using ultrasonic wave velocity measurements. The phase-tracing method is used to measure the phase velocities experimentally and the results for an adhesive plate of aluminium-aluminium are given to verify the theoretical predictions.

关键词： plate rigidity dispersion

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Ion exchange coupled biomineral self-sacrificial template synthesis of N-enriched porous carbon as robust electrocatalyst for rechargeable Zn-air battery

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Rare Metals 2023年第4期42卷 1186-1194页

作者： xiao xiao Hui Zhao Lin-Feng Li Bing-liang Qu Yu-lian Wu Yin-Ling Zhu Bei-Bei Chen Gang Pan School of Chemistry and Environment Guangdong Ocean UniversityZhanjiang524088China Research Center for Coastal Environmental Protection and Ecological Resilience Guangdong Ocean UniversityZhanjiang524088China College of Coastal Agricultural Science Guangdong Ocean UniversityZhanjiang524088China School of Humanities York St John UniversityLord Mayor’s WalkYorkYO317EXUK

To realize the commercialize of rechargeable Zn-air battery(RZAB),developing metal-free bifunctional electrocatalysts with satisfactory activity for oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is one of the emerging ***,a prawn shells-derived N-enriched porous carbon(PSNC)is synthesized via an ion exchange coupled biomimetic selfsacrificing template *** resulting PSNC displays unique functional components,including the interconnected macro-meso-micropores structure to shorten charge and mass transfer pathway,high content of pyridinic and graphitic nitrogen to construct rich catalytic active site and improve *** electrocatalysts in alkaline condition,the optimized PSNC-0.8 achieves excellent bifunctional catalytic propriety with a narrow potential gap(ΔE)value of 0.80 ***,PSNC-0.8-based RZAB displays a high peak power density of 176.5 mW·cm^(-2)and considerable cycling durability with a small battery efficiency delay of 6.5%after 480 cycles(320 h).This study enlightens a simple and effective conception to design high-performance metal-free bifunctional electrocatalysts from seafood waste.

关键词： Rechargeable Zn-air battery(RZAB) Bifunctional electrocatalyst N-enriched porous carbon Biomineral self-sacrificial template Ion exchange

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