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Research on the microstructure and properties of a multi-pass friction stir processed 6061Al coating for AZ31 Mg alloy

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Journal of Magnesium and Alloys 2019年第4期7卷 696-706页

作者： Xiaoming Xiong Yan Yang Jinguang li minmin li Jian Peng Chen Wen Xiaodong Peng College of Materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China Beijing Spacecrafts Beijing 100090China

A 6061 Al coating for AZ31 Mg alloy was prepared by multi-pass friction stir welding(FSW)with different travel *** mi-crostructure,mechanical properties of the interfacial region and the corrosion behavior of the coating were investigated *** results indicate that the interfacial intermetallic compounds formed in the stir zone(SZ)consist of mainly Al12Mg17 and *** inter-metallic compounds in the SZ are significantly increased when the travel speed is increased from 30 mm/min to 60 mm/*** measurements and results of shear-tensile tests show that the mechanical properties are influenced by the intermetallic compounds formed in the SZ during *** tests indicate that the 6061 Al coating can significantly improve the corrosion resistance of AZ31 *** 6061 Al coating obtained with a travel speed of 30 mm/min has a maximum corrosion potential E corr of-0.503 V VSE.

关键词： AZ31 alloy 6061Al alloy FSW Microstructure Properties Corrosion

Genetic analysis and QTL mapping of growth period traits and plant height traits in soybean recombinant inbred lines from Dongnong 47 × PI 317334-B

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Oil Crop Science 2021年第2期6卷 66-73页

作者： Jing li Jiafan Sun minmin li Xue Zhao lin Zhao Soybean Research Institute Key Laboratory of Soybean Biology in Chinese Education MinistryNortheast Agricultural UniversityHarbin150030China

High and stable yield is the main goal of soybean genetic *** this study,association analysis was used to detect the quantitative trait loci(QTL)for the plant height,and soybean growth period using 182 SSR markers in the RIL population of 136 F_(4:8) lines,which developed from a cross between photoperiod-insensitive cultivar‘Dongnong 47’and photoperiod-sensitive variety PI317334–*** results showed that 33 QTLs related to soybean growth period and plant height traits were detected by compound interval mapping,and were located on 12 linkage groups including N,C1,C2,J,D1a,B2,E,G,A2,O,L,I,with the contribution rate of 7.85–33.84%.These QTL loci and linkage markers related to soybean photoperiod sensitivity,would be helpful to identify key genes that control soybean photoperiod sensitivity,and provide an important basis for the breeding of new photoperiod-insensitive soybean varieties based on molecular design breeding.

关键词： Soybean Photoperiod response Recombinant inbred lines SSR markers QTL genetic map

Self-assembly of phosphorylated peptide driven by Dy^(3+)

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Chinese Chemical Letters 2023年第8期34卷 180-183页

作者： Hang Yang Yuting Xiong minmin li Zhiying Yang Peiran Meng Guangyan Qing CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China Zhang Dayu School of Chemistry Dalian University of TechnologyDalian 116024China

Nature chooses phosphorylation as a key modification to modulate and program the functions of *** phosphorylated peptides(PPs)have been widely identified and investigated by biologists,but the possibility that PPs could become a building unit for artificial materials is *** we report for the first time a supramolecular assembly of PPs with the assistance of dysprosium ions(Dy^(3+)).Dy^(3+)bridges multiple phosphate groups in double-phosphorylated peptides(di-PPs),and braid these peptide chains into *** assembly occurs inside nanochannels and blocks the channels,leading to prominent“ON–OFF”switching in transmembrane ionic *** di-PPs’assembling process could be dynamically regulated by the addition or deletion of phosphate groups under the control of kinases or *** study proves the huge potential of PPs being utilized as materials via self-assembling,which will promote the design of novel bio-inspired artificial materials and devices.

关键词： Nanochannel Phosphorylation Self-assembly Peptides Dysprosium

Test and Analysis of the Sound Insulation Performance of Four Types of Timber Structure Floors under Jumping Excitation

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Journal of Renewable Materials 2021年第4期9卷 829-840页

作者： Yujie Huang Hao Zhu Dauletbek Assima Zheng Wang minmin li Xinyue Zhao College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China College of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing210037China College of Civil Engineering Tongji UniversityShanghai200092China College of Civil Engineering Nanjing Forestry UniversityNanjing210037China

To improve the impact sound insulation performance of building floors and meet the objective requirements for living comfort of residents,in this article,three kinds of elastic cushion materials,Portuguese cork board,BGL insulation sound insulation foam board,and EPP polypropylene plastic foam board,are applied to the sound insulation of a light frame wood floor structure of the same bedroom and compared to the ordinary *** study uses the transfer function method and transient excitation method to measure the sound insulation,damping ratio,and elastic modulus of materials,as well as the sound insulation of the floor under the jumping excitation method of daily *** comparative analysis,the results and factors of improving the sound insulation performance of the floor are obtained,according to which three types of elastic cushion materials and the floor covering composed of them have higher vibration and noise reduction *** them,the overall sound insulation performance of BGL board floor is the highest,followed by EPP board and cork board floor,and ordinary OSB floor is the *** the jumping excitation method,three floating floors can improve the impact sound insulation performance of the middle and low-frequency bands.

关键词： Timber floor structure elastic cushion material damping ratio elastic modulus jumping excitation method of daily behavior testing and comparative analysis

Microstructure and Corrosion Properties of Duplex-Structured Extruded Mg-6li-4Zn-xMn Alloys

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Acta Metallurgica Sinica(English Letters) 2022年第5期35卷 867-878页

作者： minmin li Zhe Qin Yan Yang Xiaoming Xiong Gang Zhou Xiaofei Cui Bin Jiang Xiaodong Peng Fusheng Pan National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing400044China State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing400044China International Joint Laboratory for light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing400044China

The extruded Mg-6 li-4 Zn-xMn(x=0,0.4,0.8,1.2 wt%)alloys were prepared,and the microstructure of the test alloys was investigated by optical microscopy,scanning electron microscopy and transmission electron *** corrosion properties were determined by electrochemical measurements and immersion measurements in 3.5%NaCl *** results indicate that the extruded Mg-6 li-4 Zn-xMn alloys are mainly composed ofα-Mg phase,β-li phase,Mn precipitates and some intermetallic compounds(Mgli_(2)Zn).With the addition of Mn,stable corrosion products were formed on the surface of the test alloy,which can effectively inhibit further corrosion progress and improve the corrosion ***-6 li-4 Zn-1.2 Mn alloy exhibits the best corrosion resistance,attributed to grain refinement,the improvement of the stability of corrosion product film and uniform distribution of fine second phases.

关键词： Mg-li alloys Microstructure Extruded Corrosion resistance property

Remarkable difference of phospholipid molecular chirality in regulating PrP aggregation and cell responses

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Chinese Chemical Letters 2023年第2期34卷 236-243页

作者： Cunli Wang Xue Wang Dongdong Wang Shengxu Qian Fusheng Zhang Mingyang li minmin li Wenqi Lu Bo liu Guangyan Qing School of Biomedical Engineering Dalian University of TechnologyDalian 116024China CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China College of Chemistry and Chemical Engineering Wuhan Textile UniversityWuhan 430200China

Prion diseases are fatal neurodegenerative diseases that can cause severe *** misfolding and accumulation of the prion peptide (PrP)_(106–126) is crucial,and this process is closely relevant to biological ***,how PrP_(106–126)aggregation is affected by the molecular chirality of phospholipid membrane is ***,in this study,a pair of L-and D-aspartic acid (Asp)-modified 1,2-dipalmitoyl-sn–glycero-3-phosphoethanolamine (DPPE) were synthesized to construct chiral *** discover that L-Asp-DPPE liposomes strongly inhibit the oligomerization and amyloidogenesis of PrP_(106–126),whether acting on monomers or oligomers,which rescues cytotoxicity induced by PrP_(106–126).By comparison,D-Asp-DPPE liposomes inhibit peptide oligomerization only at a high concentration and cannot prevent amyloidogenesis when acting on oligomers,which lead to pronounced *** experiment,dynamic change of intracellular Ca^(2+)(_(i)Ca^(2+)) and Ca^(2+)release from endoplasmic reticulum(ER),reactive oxygen species (ROS) production,adsorption dynamics and affinity tests,and fluorescent imaging clearly disclose that molecular chirality of the liposomes dominates conformational transition of PrP_(106–126)from random coil to β-sheet,binding and adsorption of the monomers and oligomers,and subsequent fibrillation process,resulting in distinct inhibition effect in Ca^(2+)overload and release,ROS production and cell *** work is the first to report that interfacial molecular chirality is a potentially crucial influence on the fibrillation process of PrP_(106–126) and its cell responses,whereas the convergence of chiral amino acids and liposomes can be considered potential inhibitors in prion diseases.

关键词： Prion disease liposome Chirality Interface Cytosolic Ca^(2+)

Unilateral pleural effusion secondary to Takayasu arteritis: a case report and literature review

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The Journal of Biomedical Research 2022年第2期36卷 141-144页

作者： ling Chen Ting Ma liang Wang lixin Wang minmin li Rong Zhu The Huai'an Clinical College of Xuzhou Medical University Huai'anJiangsu 223300China Department of Respiratory Medicine Huai'an First People's HospitalHuai'anJiangsu 223300China

Takayasu arteritis (TA) is a chronic, nonspecific inflammatory disease of large and medium-sized vessels that primarily involves the aorta and its branches. TA involving the pulmonary arteries has a prevalence ranging from 14% to 86%, which can lead to pulmonary hypertension, a progressive increase in pulmonary artery pressure, and eventually death from right heart failure. The presentation of pulmonary arteritis (PA) is very nonspecific, with a reported misdiagnosis rate of up to 60% and a diagnosis time ranging from 1 month to more than 10 years. The clinical manifestation of pleural effusion is very rare in both TA and PA cases. Based on our literature review, this is the 6th reported case of TA with pleural effusion, and the specific mechanism of TA with pleural effusion is still unclear. The characteristics of this case and the previously reported cases are summarized in this article to improve the understanding of TA and PA and reduce the misdiagnosis rate.

关键词： Takayasu arteritis pulmonary arteritis pleural effusion case report literature review

Effect of Mn content on the microstructure and mechanical properties of Mg–6li–4Zn-xMn alloys

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Progress in Natural Science:Materials International 2021年第4期31卷 583-590页

作者： Hongju Deng Yan Yang minmin li Xiaoming Xiong Guobing Wei Weidong Xie Bin Jiang Xiaodong Peng Fusheng Pan International Joint Laboratory for light Alloys (MOE) College of Materials Science and Engineering Chongqing University State Key Laboratory of Mechanical Transmissions College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University

The as-cast Mg–6li–4Zn-x Mn alloys were prepared and extruded at 280℃ with an extrusion ratio of 25:1. The effects of Mn content on the microstructure and mechanical properties of Mg–6li–4Zn-x Mn alloys were investigated in this study. The XRD results show that Mg–6li–4Zn–x Mn alloys consisted of α-Mg(hcp) + β-li(bcc)duplex structured matrix, Mg liZn and Mn phases. The grains of the extruded Mg–6li–4Zn–x Mn alloys were refined by dynamic recrystallization during the extrusion process. The EBSD results show that the extruded alloys had basal textures. The grain size of the extruded alloys decreased while the basal texture was strengthened with the increasing Mn addition. The TEM results show that a large amount of nanoscale Mn precipitates existed in the extruded Mg–6li–4Zn–1.2 Mn alloy, which can effectively inhibit the dynamic recrystallized(DRXed) grains growth during the hot extrusion and is beneficial to the improvement of mechanical ***–6li–4Zn–1.2 Mn alloy in this research possesses the best mechanical properties with the ultimate tensile strength and yield strength of 321 MPa, 250 MPa, respectively.

关键词： Mg–6li–4Zn-xMn alloys Extrusion Microstructure Mechanical properties

The fractal or scaling perspective on progressively generated intra-urban clusters from street junctions

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International Journal of Digital Earth 2023年第1期16卷 1944-1961页

作者： Biao He Renzhong Guo minmin li Ying Jing Zhigang Zhao Wei Zhu Chen Zhang Chengyue Zhang Ding Ma Research Institute for Smart Cities School of Architecture and Urban PlanningShenzhen University&MNR Technology Innovation Center of Territorial&Spatial Big Data&MNR Key Laboratory of Urban Land Resources Monitoring and Simulation&Guangdong-Hong Kong-Macao Joint Laboratory for Smart CitiesShenzhenPeople’s Republic of China Guangdong Laboratory of Artificial Intelligence and Digital Economy(SZ) ShenzhenPeople’s Republic of China Ningbo Institute of Technology School of EconomicsZhejiang UniversityNingboPeople’s Republic of China School of Resource and Environmental Sciences Wuhan UniversityWuhanPeople’s Republic of China

The underlying complexity of urban space can be manifested by its fractal forms and scaling *** paper examines these characteristics at the intra-urban scale through the lens of clustered street junctions(including road ends)in two Chinese metropolitan areas:Beijing and *** derived the cluster sets with Euclidean distance thresholds starting at 100 meters(m)and ending at 1000 m,and outlined each cluster using a concave-hull method to maintain their original irregular *** each delimited cluster,we examined four urban attributes:gross domestic product,number of street nodes,polygon area,and *** analysis revealed that power law distribution applied to almost every cluster set in terms of the four attributes,but varied from one attribute to another or from city to city,represented primarily byfluctuated power law exponents and ht-index values whose profiles along with the cluster growth can effectively characterize the urban ***,we computed the spectrum of intra-urban scaling exponents with cluster size increments,contributing new insights into the allometric relationships between urban configuration and function.

关键词： Spatial clustering urban structure urban function power law intra-urban scaling law