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Natural passivation behavior and its influence on chloride-induced corrosion resistance of stainless steel in simulated concrete pore solution

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JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 2020年第6期9卷 12378-12390页

作者： Yuan, xuwen Wang, Xuan cao, Yang Yang, Huaiyu Chinese Acad Sci Inst Met Res Shenyang 110016 Peoples R China Univ Sci & Technol China Sch Mat Sci & Engn Hefei 230026 Peoples R China

This study presents a combined electrochemical and X-ray photoelectron spectroscopy (XPS) surface analytical investigation on the natural passivation process and its effect on Cl- induced corrosion resistance of traditional carbon steel, ferritic and austenitic stainless steels (SSs) (i.e. HRB400 steel, 430 and 304 SSs) in simulated concrete pore solution (SPS). It was found that a complete and more compact passive film with a stratified structure could be naturally formed on the tested steel surfaces after different immersion time. The chemical composition of the passive film and its corrosion resistance strongly depended on the alloying element and natural passivation time. For HRB400 steel, the outer layer of natural passive film was mainly composed of Fe3+ species and the inner layer was predominated by Fe2+ ones, while the outer layer of natural passive film formed on SSs surface consisted of Fe and Cr oxides and hydroxides, enriched in Fe3+ species, and an inner layer was made of mixed Fe2+ and Cr3+ oxides (enriched in Fe2+ species). The natural pre-passivation could effectively improve the Cl- induced corrosion resistance of three steels. Compared with HRB400 steel, both austenitic and ferritic SSs exhibited the better corrosion resistance due to the formation of Cr-enriched passive film, of which, 304 SS had the highest pitting corrosion resistance. (C) 2020 The Author(s). Published by Elsevier B.V.

关键词： Stainless steel Natural passivation Pitting corrosion EIS Cyclic potentiodynamic polarization

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Interphasial Chemistry Design for Seamless Lithium Deposition in Anode-Free Lithium Metal Batteries

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ADVANCED MATERIALS 2025年

作者： Song, Xuan Liu, Cheng Zhang, Aiyuan Ding, Li Zeng, Tianyou Lu, Yang Ou, Yu Hou, Wenhui Zhou, Pan cao, Qingbin Yan, Shuaishuai Liu, Zhi Peng, xuwen Zhou, Haiyu Xia, Yingchun Zhang, Weili Liu, Hao Liu, Kai Tsinghua Univ Dept Chem Engn Beijing 100084 Peoples R China China Acad Space Technol Beijing 100094 Peoples R China Beijing Mingyuan Space Elect Informat Technol Co L Beijing 100080 Peoples R China Tsinghua Univ Hefei Inst Publ Safety Res Hefei 230601 Peoples R China

Anode-free lithium metal batteries (AFLMBs) are promising due to ultrahigh energy density, reduced manufacturing costs, and enhanced safety through active lithium elimination. However, their practical implementation remains challenged by unstable electrode-electrolyte interfaces and the resulting rapid active species depletion. Herein, an ultrathin ion-conducting membrane (ICM) is designed, featuring uniformly distributed rigid benzenesulfonimide anionic groups and flexible lithiophilic groups containing ether oxygen groups. The constrained benzenesulfonimide anions enable exceptional charge separation and reduced spatial resistance, boosting lithium-ion mobility, while the integrated lithophilic network directs lateral lithium deposition through ionic nanochannels. This ICM layer effectively promotes the enrichment of anions at the interface and constructs stable anion-derived solid electrolyte interphases (SEI). Meanwhile, ICM layers with electron-insulating and ion-conducting properties can further prevent side reactions, and suppress dendritic Li growth acting as a natural shield, resulting in seamless lithium deposition. Specifically, the Li||Cu coin cells with ICM achieve 99.82% Coulombic efficiency. The AFLMBs assembled with ICM-coated copper foil (ICM Cu) and NCM811 deliver an energy density of 495 Wh kg-1 with 80.72% capacity retention after 100 cycles. The interphasial chemistry design strategy provides insights into the precise interfacial engineering to realize high-performance, high-safety battery systems and facilitates their development for practical applications.

关键词： anode-free lithium metal batteries dendrite suppression interphasial chemistry ion-conducting membranes solid electrolyte interphases

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Identification of Ly2 members as antimicrobial peptides from zebrafish Danio rerio

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BIOSCIENCE REPORTS 2017年第1期37卷 BSR20160265-BSR20160265页

作者： Liu, Xuemin cao, xuwen Wang, Su Ji, Guangdong Zhang, Shicui Li, Hongyan Ocean Univ China Inst Evolut & Marine Biodivers Dept Marine Biol Qingdao 266003 Peoples R China Ocean Univ China Dept Marine Biol Lab Evolut & Dev Qingdao 266003 Peoples R China

The emergence of multidrug-resistant (MDR) microbes caused by overuse of antibiotics leads to urgent demands for novel antibiotics exploration. Our recent data showed that Ly2.1-3 (a novel lymphocyte antigen 6 (Ly6) gene cluster) were proteins with cationic nature and rich in cysteine content, that are characteristic of antimicrobial peptides (AMPs) and their expression were all significantly up-regulated after challenge with lipopolysaccharide (LPS). These strongly suggested that Ly2.1-3 are potential AMPs, but firm evidence are lacking. Here, we clearly showed that the recombinant proteins of Ly2.1-3 were capable of killing Gram-negative bacteria Aeromonas hydrophila and Escherichia coli, while they had little bactericidal activity against the Gram-positive bacteria Staphylococcus aureus and Bacillus subtilis. We also showed that recombinant proteins Ly2.1-3 (rLy2.1-3) were able to bind to the Gram-negative bacteria A. hydrophila, E. coli and the microbial signature molecule LPS, but not to the Gram-positive bacteria S. aureus and B. subtilis as well as the microbial signature molecule LTA. Moreover, the Scatchard analysis revealed that rLy2.1-3 could specifically bind to LPS. Finally, we found that Ly2.1-3 were not cytotoxic to mammalian cells. All these together indicate that Ly2.1-3 can function as AMPs.

关键词： zebrafish Danio rerio Ly6 gene cluster Antimicrobial peptides

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YTHDC2 inhibits rat bone mesenchymal stem cells osteogenic differentiation by accelerating RUNX2 mRNA degradation via m6A methylation

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HELIYON 2023年第8期9卷 e18876页

作者： Ma, Bo cao, Pei Zhang, Lichen Zhu, Hongyi Ye, xuwen Wang, Lingjun Chen, Liang Peking Univ Dept Trauma & Orthoped Peoples Hosp Beijing Peoples R China Nankai Univ Sch Med Tianjin Peoples R China Soochow Univ Affiliated Hosp 1 Dept Gen Surg Suzhou 215006 Jiangsu Peoples R China Soochow Univ Affiliated Hosp 1 Orthoped Inst Dept Orthoped Suzhou 215006 Jiangsu Peoples R China

As the most abundant internal mRNA modification, N6-methyladenosine (m6A) RNA methylation has been found to influence many biological events including bone mesenchymal stem cells (BMSCs) osteogenic differentiation. YTH N6-methyladenosine RNA binding protein C2 (YTHDC2) is an m6A reading protein with the ability to mediate the decay of combined methylated mRNA, however its role in BMSCs osteogenic differentiation remains unknown. In this study, we first found an increase of RUNX family transcription factor 2 (RUNX2) expression and a decrease of YTHDC2 expression during the process of BMSCs osteogenic dif-ferentiation. Furthermore, we transfected BMSCs with YTHDC2 interference fragment, resulting in an increased content of RUNX2 mRNA and protein inside BMSCs. Finally, through RNA Immunoprecipitation experiments, we confirmed that YTHDC2 protein can bind to RUNX2 mRNA and accelerate its decomposition. Moreover, the immunofluorescence staining also showed a negative correlation between YTHDC2 and RUNX2. In conclusion, during BMSCs osteogenic differentiation, YTHDC2 protein showed decreased expression, resulting in a higher level of RUNX2 (mRNA and protein) expression inside cells, indicating YTHDC2 as a promising molecular target for the regulation of BMSCs osteogenic differentiation.

关键词： BMSCs Osteogenic differentiation m6A YTHDC2 RUNX2

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Data-driven model-free adaptive sliding mode control for electromagnetic linear actuator

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JOURNAL OF MICROMECHANICS AND MICROENGINEERING 2022年第5期32卷 055007-055007页

作者： Gu, Chaofan Tan, cao Li, Bo Lu, Jiayu Wang, Geng Chi, xuwen Shandong Univ Technol Sch Transportat & Vehicle Engn Zibo 255049 Shandong Peoples R China Shandong Zhongbaokang Med Appliance Co Ltd Chengdu Peoples R China

A data-driven model-free adaptive sliding mode control (MFASMC) method is proposed to tackle the problems of inaccurate model and time-varying parameters of a micro electro-magnetic linear actuator system, considering the dependence of existing model-based control methods on the system dynamics model and the impact of unmodeled dynamics on the control performance. Firstly, the pseudo-gradient concept in the model-free adaptive control (MFAC) framework is used to transform the electromagnetic linear actuator dynamics model, which is difficult to obtain parameters accurately, into a full-format dynamic linearized data model, the dependence of the controller on the electromagnetic linear actuator model is reduced. To compensate for the effects of unknown perturbations, an improved discrete sliding mode exponential convergence law is introduced to derive a new composite control algorithm based on the pseudo partial derivative estimator, which improves the robustness of the control system. Then, the convergence of the control error and the stability of the system are demonstrated by theoretical analysis. The results show that the proposed MFASMC reduces the 10 mm step response time of the electromagnetic linear actuator by 46.3% and 25.3% compared with proportional-integral-derivative control (PID) and MFAC. The phase lag time and root-mean-square error of MFASMC under sinusoidal conditions are 0.8 ms, 0.178 mm respectively, and the steady-state error does not exceed 0.05 mm. The experimental and simulation results keep the error within 5%, the proposed control algorithm has good trajectory tracking response speed and control accuracy, and has good robustness to system uncertainty and external force disturbance.

关键词： electromagnetic linear actuator data-driven model-free adaptive control discrete sliding mode control dynamic linearization position control

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Improving the self-healing performance of the water-borne epoxy anticorrosion coating in 3.5 wt% NaCl solution using acid and alkaline dual sensitive organic microspheres

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PROGRESS IN ORGANIC COATINGS 2022年 167卷 106815-106815页

作者： cao, Yang Yuan, xuwen Wang, Xuan Wu, Hao Wang, Ge Yang, Huaiyu Chinese Acad Sci Inst Met Res Shenyang 110016 Peoples R China Univ Sci & Technol China Sch Mat Sci & Engn Hefei 230026 Peoples R China

Acid-alkaline double sensitive Eudragit microspheres embedded with corrosion inhibitor 8-hydroxyquinoline (8HQ@Eu) were prepared by a low-cost one-step method, and a novel coating was designed to improve the self-healing performance of the water-borne epoxy resin in 3.5 wt% NaCl solution by using the 8HQ@Eu as smart anti-corrosive carrier. The results of electrochemical impedance spectroscopy (EIS) showed the low-frequency impedance modulus (|Z|(0.01Hz)) of the scratched coating was about 10 times higher than that of the pure epoxy coating in the presence of 8HQ@Eu microspheres after 30 d of immersion, and the oxide film resistance and charge transfer resistance of the 8HQ@Eu sample increased about 10 times and 8 times respectively due to the covering of corrosion inhibitor protective film. While the results of scanning vibrating electrode technique (SVET) indicated the corrosion current of the 8HQ@Eu sample in the scratched area decreased to more than an order of magnitude lower than that of pure epoxy coating within 24 h. Salt spray test indicated that the substrate corrosion and coating delamination near the scratched area were significantly inhibited. XPS analysis directly confirmed that the corrosion inhibitor was delivered to the corroded sites.

关键词： Self-healing coating pH-sensitive microspheres Loading capacity Anticorrosion

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基于大变形理论的机械手四维柔性位移感器研究及标定

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传感技术学报 2022年第10期35卷 1326-1334页

作者：祖洪飞曹贤浩陈旭雯浙江理工大学机械与自动控制学院浙江杭州310018 浙江龙宇智能科技有限公司浙江海宁314419

本文针对柔性四维位移传感器各方向位移之间的耦合问题,对其位移与应变关系进行了研究。通过对弹性体表面应变片布片方案的优化以及采用基于悬臂梁模型的大变形理论,有效降低了x、y、z、θ_(z)四个方向之间的位移耦合,实现了对各方向位... 详细信息

本文针对柔性四维位移传感器各方向位移之间的耦合问题,对其位移与应变关系进行了研究。通过对弹性体表面应变片布片方案的优化以及采用基于悬臂梁模型的大变形理论,有效降低了x、y、z、θ_(z)四个方向之间的位移耦合,实现了对各方向位移的精确测量,并通过仿真分析验证了该模型及方法的正确性。最后,制作了四维位移传感器,并进行了实验测试及标定,结果表明该传感器不仅能同时进行多方向位移测量,还能把全量程测量误差控制在4%以内,尤其是x、y方向测量误差小于2%。实现了结构简单、测量范围大、测量精度高的四维位移传感器的设计及验证。

关键词：位移传感器四维应变式大变形

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Seismic performance of a new type of precast shear walls with non-connected vertical distributed reinforcement

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JOURNAL OF BUILDING ENGINEERING 2021年 44卷

作者： Liao, Xiandong Zhang, Shiqian cao, Zhiwei Xiao, xuwen China Construct Eighth Engn Div Co Ltd Shanghai 200112 Peoples R China Tongji Univ Dept Struct Engn Shanghai 200092 Peoples R China China State Construct Engn Corp Beijing 100029 Peoples R China

To eliminate the shortcomings in the grouting sleeve and other connection forms in precast concrete shear wall structure induced by the poor grouting, difficult quality assurance, low construction efficiency, and high cost, a new type of monolithic assembled concrete shear wall structure with non-connected vertical distributed reinforcement was proposed in this paper. The new shear wall structure is composed of middle precast wall panels and cast-in-place boundary members. The vertical distributed reinforcement in the middle precast wall panels is not connected between the upper and lower floors. This technique was based on the normal section bearing capacity of equal strength and inclined section bearing capacity of equal strength compared with the cast-in-place shear wall structure. Three full-scale models of precast shear walls and one cast-in-place contrast specimen were tested for their seismic performance under pseudo-static loading. All precast specimens are cast based on the manufacture specification of the factory. By analysis of test results, including the failure modes, load-lateral drift hysteresis curves, bearing capacity, hysteretic characteristics, deformation components, ductility, rigidity degeneration, energy dissipation, and strain distribution, all the specimens were obtained and compared. Comparisons between test results indicate that the proposed shear walls have a similar bearing capacity as that of the cast-in-place shear wall and improved energy dissipation and ductility. Moreover, the specimen with inclined reinforcement performs better in drift capacity compared to companion specimens. The contribution of flexural deformation to the total displacement of each specimen is the largest, follow by the contribution of shear deformation, and the contribution of slip is the smallest. The strain of non-connected vertical distributed reinforcement of the precast panel did not yield during the loading process. The cross-section of the precast shear

关键词： Precast concrete shear wall Non-connected vertical distributed reinforcement Equal strength Pseudo-static Deformation Strain distribution

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Molecular and epidemiological characterization of Staphylococcus aureus causing bovine mastitis in China

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MICROBIAL PATHOGENESIS 2024年 191卷 106640页

作者： Zhu, Lingling Lai, Yuxin Li, xuwen Ma, Hui Gong, Fengju Sun, Xueqiang cao, Aiqiao Jiang, Tao Han, Yintao Pan, Zihao Nanjing Agr Univ Coll Vet Med OIE Reference Lab Swine Streptococcosis Nanjing Peoples R China Nanjing Agr Univ Coll Vet Med Nanjing Peoples R China China Anim Hlth & Epidemiol Ctr Qingdao Peoples R China Shenzhen Ctr Anim Dis Control & Prevent Shenzhen Peoples R China Nanjing Univ Jinling Hosp Affiliated Hosp Med Sch Dept Stomatol Nanjing Peoples R China

Background: Staphylococcus aureus is one of the most prevalent pathogens in bovine mastitis, which leads to substantial financial losses for the dairy industry. Results: In this study, S. aureus (n = 72) was isolated from 18 dairy farms in 15 provinces across China in 2021. The identification of these isolates at the species level was achieved by employing 16S rRNA sequencing. An isothermal amplification method for auxiliary detection of S. aureus was established, which can be employed not only for laboratory detection but also for point-of-care testing (POCT). Molecular characteristics of S. aureus mastitis in Chinese dairy cows were determined through MLST and spa typing. Finally, methicillin-resistant Staphylococcus aureus (MRSA) and MRSA resistance genes were detected using MIC and PCR amplification techniques. 72 isolates were identified as 12 sequence types (STs) and 7 clonal complexes (CC). ST1/CC1 was the dominant prevalent accounting for 33.3 % of the total, and exhibiting a wide distribution range. In terms of spa types, t114 was the dominant type, accounting for 31.9 % of the total, followed by t529 as the second major type. Four S. aureus strains were classified as MRSA according to their levels of oxacillin resistance (MIC >= 4 mu g/mL). Among these four MRSA strains, one of them was found to be mecA positive. However, the presence of drugresistance genes mecA and mecC was not detected in the remaining three MRSA strains, indicating the possible existence of new resistance genes. Conclusions: Our study investigated the prevalence of S. aureus mastitis in dairy cows in China, while also examined the molecular characteristics and MRSA strains. This information will help with the clinical monitoring, prevention, and control of S. aureus mastitis in dairy cattle.

关键词： Staphylococcus aureus Molecular characterization MRSA MLST Spa

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竖向分布钢筋不连续的装配式剪力墙等强设计方法

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建筑结构学报 2022年第7期43卷 81-90页

作者：马昕煦张晓勇曹志伟张士前肖绪文中国建筑第八工程局有限公司上海200122 同济大学土木工程学院上海200092 中国建筑股份有限公司北京100029

为解决装配式剪力墙灌浆套筒构造施工难、存在安全风险的问题,提出一种竖向分布钢筋不连续并加粗两侧现浇区纵筋直径的装配式剪力墙体系。提出了该剪力墙的承载力计算式,并建立了30个有限元分析模型对其进行检验,结果表明,采用正截面承... 详细信息

为解决装配式剪力墙灌浆套筒构造施工难、存在安全风险的问题,提出一种竖向分布钢筋不连续并加粗两侧现浇区纵筋直径的装配式剪力墙体系。提出了该剪力墙的承载力计算式,并建立了30个有限元分析模型对其进行检验,结果表明,采用正截面承载力设计值对承载力的估计较为准确,且初始刚度与现浇剪力墙一致。为便于实际工程设计,提出了间接设计方法,即将现浇剪力墙按压弯等强和抗剪等强的配筋原则等效为装配式剪力墙,设计过程中,所有标准层剪力均按底层标准层进行等效配筋。通过对间接设计方法合理性分析,发现虽然按照“偏心受压等强替换”原则配筋的装配式剪力墙在低轴压比条件下承载力低于现浇剪力墙,但由于层间剪力较低,结构仍满足安全性要求。

关键词：装配式剪力墙不连续钢筋承载力等强设计方法

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