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Changes in microstructure and properties of weld heat-affected zone of high-strength low-alloy steel

Journal of Iron and Steel research International 2024年第8期31卷 2041-2052页

作者： Shu-jun Jia Qi-lin ma Yu Hou ba Li He-song Zhang Qing-you Liu Central Iron and Steel research Institute Co. Ltd.Beijing 100081China Collaborative Innovation Center for Steel Commonality University of Science and Technology BeijingBeijing 100083China Construction Project management Branch of China National Petroleum Pipeline Network Group Co. Ltd.Langfang 065000HebeiChina

The evolution of the microstructure and toughness of APL5L X80 pipeline steel after thermal welding simulation was investigated by X-ray diffraction,electron backscatter diffraction,and transmission electron *** results indicated that primary heat-affected zones can be divided into weld,coarse-grained,fine-grained,intercritical,and sub-critical *** microstructure of the weld zone is mainly composed of bainitic ferrite and a small amount of granular bainite;however,the original austenite grains are distributed in the columnar *** structure of the coarse-grained zone is similar to that of the weld zone,but the original austenite grains are *** contrast,the microstructure in the fine-grained zone is dominated by fine granular bainite,and the effective grain size is only 8.15μm,thus providing the highest toughness in the entire heat-affected *** intercritical and subcritical zones were brittle valley regions,and the microstructure was dominated by granular ***,the martensite-austenite(M/A)constituents are present in island chains along the grain boundaries,and the coarse size of the M/A constituents seriously reduces the *** results of the crack propagation analyzes revealed that high-angle grain boundaries can significantly slow down crack growth and change the crack direction,thereby increasing the material *** impact toughness of the low-temperature tempering zone was equivalent to that of the columnar grain zone,and the impact toughness was between those of the critical and fine-grained zones.

关键词： Welding thermal simulation Impact toughness Crack propagation martensite-austenite constituent High-strength low-alloy steel weld Heat-affected zone

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Bio-based Waterborne Poly(Vanillin-Butyl Acrylate)/MXene Coatings for Leather with Desired Warmth retention and Antibacterial Properties

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Engineering 2024年第5期36卷 250-263页

作者： Jianzhong ma Li ma Lei Zhang Wenbo Zhang Qianqian Fan Buxing Han College of Bioresources Chemical and materials Engineering Shaanxi University of Science and TechnologyXi’an 710021China Xi’an Key Laboratory of Green Chemicals and Functional materials Xi’an 710021China College of Chemistry and Chemical Engineering Shaanxi University of Science and TechnologyXi’an 710021China Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry and Technology Shaanxi University of Science and TechnologyXi’an 710021China Institute of Chemistry Chinese Academy of SciencesBeijing 100190China

This study presents a solvent-free,facile synthesis of a bio-based green antibacterial agent and aromatic monomer methacrylated vanillin(MV)using *** resulting MV not only imparted antibacterial properties to coatings layered on leather,but could also be employed as a green alternative to petroleum-based carcinogen styrene(St).Herein,MV was copolymerized with butyl acrylate(ba)to obtain waterborne bio-based P(MV-ba)miniemulsion via miniemulsion ***,MXene nanosheets with excellent photothermal conversion performance and antibacterial properties,were introduced into the P(MV-ba)miniemulsion by ultrasonic *** the gradual solidification of P(MV-ba)/MXene nanocomposite miniemulsion on the leather surface,MXene gradually migrated to the surface of leather coatings due to the cavitation effect of ultrasonication and amphiphilicity of MXene,which prompted its full exposure to light and bacteria,exerting the maximum photothermal conversion efficiency and significant antibacterial *** particular,when the dosage of MXene nanosheets was 1.4 wt%,the surface temperature of P(MV-ba)/MXene nanocomposite miniemulsioncoated leather(PML)increased by about 15℃ in an outdoor environment during winter,and the antibacterial rate against Escherichia coli and Staphylococcus aureus was nearly 100%under the simulated sunlight treatment for 30 ***,the introduction of MXene nanosheets increased the air permeability,water vapor permeability,and thermal stability of these *** study provides a new insight into the preparation of novel,green,and waterborne bio-based nanocomposite coatings for leather,with desired warmth retention and antibacterial *** can not only realize zerocarbon heating based on sunlight in winter,reducing the use of fossil fuels and greenhouse gas emissions,but also improve ability to fight off invasion by harmful bacteria,viruses,and other microorganisms.

关键词： MXene nanosheets Vanillin Styrene substitute Leather coating Photothermal conversion Warmth retention Antibacterial properties

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From Fostering to Delusional Disorder of Filiation

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Open Journal of Psychiatry 2024年第4期14卷 283-286页

作者： Momar Camara Wissem masmoudi El Hadji makhtar ba Sokhna Seck maïmouna Dieye Aïda Sylla Department of Psychiatry and Medical Psychology Cheikh Anta Diop University Dakar Senegal Thiaroye National Psychiatric Hospital Center Dakar Senegal Fann National University Hospital Center Dakar Senegal Albert royer Childrens Hospital Dakar Senegal

Introduction: Fostering is a widespread practice in West Africa. It played an essential role in the circulation of children. The failure of its community regulation, not compensated by a legal framework, has made its practice precarious. Observation: A case study was conducted on Dior, who was hospitalised in a psychiatric ward for a delusional disorder of filiation. Dior was entrusted to her maternal grandmother and aunt at ages 2 and 9. During these fosterings, the place of the symbolic father was not substituted, causing a void that challenged her imagination. The outcome was an inscription in a genealogy where she had found herself with prestigious parents. Discussion: Fostering has strongly disrupted the family dynamics in Dior’s case. One of her options was to assume the paternal function, the use of which was perceived as a defiance or even a transgression. This same function would be a starting point of a psychosis whose filial character would only be an attempt at rectification where reality and imagination collide. Conclusion: our study reveals the importance of stable parental figures at stake in fostering contexts, which constitute a risk factor for the development of a subsequent psychosis.

关键词： Delusional Disorder of Filiation Psychopathology Interactions Fostering Family

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Cathodic corrosion as a facile and universal method for scalable preparation of powdery single atom electrocatalysts

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Nano research 2024年第6期17卷 4943-4950页

作者： rui Li Xiayan Yan Meng Liu Qingkai Zhao Jie Du Xinxin Tan Jingwen ba rongguang Zeng Wenhua Luo Jingsong Xu Institute of materials China Academy of Engineering PhysicsJiangyou 621907China Science and Technology on Surface Physics and Chemistry Laboratory Jiangyou 621908China

Top-down strategy has been widely applied for synthesis of metal single atom catalysts(SACs)via converting metal nanoparticles or bulk metals into atomically dispersed ***,we report a simple electrochemical atomic migration strategy for top-down synthesis of SACs via a facile cathodic corrosion process without involving high temperature or harsh *** of metal nanoparticles on cathode are firstly disbanded under high negative voltage,and emitted into the electrolyte in the form of atomic metal anions in Zintl *** escaped atomically dispersed metal species are then oxidized by water molecules and captured by the defects on the pre-added nitrogen doped carbon carriers in the *** cathodic corrosion strategy is confirmed to be suitable for scalable synthesis of kinds of metal SACs(e.g.,Pt,Pd,and Ir)on doped carbon ***,the as-prepared nitrogen doped carbon powder supported Pt SACs exhibit superior catalytic activity toward hydrogen evolution reaction(HEr)with a low overpotential of 0.024 V at 10 ma·cm^(−2)and a low Tafel slope of 29.7 mV·dec^(−1)as well as a long-term durability.

关键词： cathodic corrosion top-down strategy powdery single atom catalysts hydrogen evolution reaction scalable synthesis

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Comparative studies between humans and golden Syrian hamsters via thromboelastography

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Animal Models and Experimental Medicine 2024年第4期7卷 570-577页

作者： Ze Yang Lili Xie Jingjing ba Simin Zan Letong Zhang Xinyi Zhang Yang Yu School of Laboratory Animal&Shandong Laboratory Animal Center Shandong First Medical University&Shandong Academy of Medical SciencesJinanChina The Second Affiliated Hospital of Shandong First Medical University TaianChina

background:Thromboelastography(TEG)is a widely utilized clinical testing method for real-time monitoring of platelet function and the thrombosis *** metab-olism disorders are crucial risk factors for *** lipid metabolism charac-teristics of hamsters resemble those of humans more closely than mice and rats,and their relatively large blood volume makes them suitable for studying the mechanisms of thrombosis related to plasma lipid *** blood samples from golden Syrian hamsters and healthy humans were obtained following standard clinical *** was employed to evaluate coagulation factor function,fibrinogen(Fib)function,platelet function,and the fibrinolytic ***:The whole blood from hamster or healthy human was isolated following the clinical procedure,and TEG was employed to evaluate the coagulation factor func-tion,Fib function,platelet function,and fibrinolytic *** analysis used ACLTOP750 automatic coagulation analysis *** routine testing used XN-2000 automatic blood ***:TEG parameters revealed that hamsters exhibited stronger coagulation fac-tor function than humans(reaction time[r],p=0.0117),with stronger Fib function(alpha angle,pr signifi-cantly(maximum amplitude[ma],p=0.077).Hamsters displayed higher coagulation status than humans(coagulation index[CI],p=0.0023),and the rate of blood clot dissolution in hamsters differed from that in humans(percentage lysis 30 min after ma,p=0.02).Coagulation analysis parameters indicated that prothrombin time(PT)and activated partial thromboplastin time(APTT)were faster in hamsters than in hu-mans(PT,p=0.0014;APTT,p=0.03),whereas the Fib content was significantly lower in hamsters than in humans(prence was observed in thrombin time(p=0.1949).Conclusions:In summary,TEG could be used to evaluate thrombosis and bleeding parameters in whole blood samples

关键词： platelet function Syrian hamster thromboelastography(TEG) thrombosis

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Alternative technology for the recovery of butyl acetate with low concentration:high capacity adsorbent and high efficiency adsorption

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Green Chemical Engineering 2024年第2期5卷 236-244页

作者： Chi ma Lihong Zhao Zhengxin mao Hao Su Qingfen Liu CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing100049China

Industrial pharmaceutical wastewater usually contains butyl acetate(ba)with a concentration of 1 wt%-7 wt%,and the traditional method for ba recovery is distillation with high energy *** method is developed to recover ba with low concentration for the high efficiency and low energy *** polar polyacrylate resins with macroporous structure of 233.1 nm and average particle size of about 526.5μm are successfully synthesized by suspension polymerization and used for the ba adsorption and *** maximum adsorption capacity reaches 171.1 mg g^(-1)with relative standard deviation(rSD)value of 0.2%,which is more than twice the results in the *** ba desorption rate is 97.0%at 100℃with rSD value of 0.4%,and the resins are beneficial to the reuse in the adsorption-desorption *** adsorption thermodynamics and kinetics are investigated,and the ba adsorption is a spontaneous and endothermic process with the increase of disorder *** process is mainly contributed by physical absorption and agree well with Freundlich model and pseudo-first-order adsorption kinetic *** adsorption method avoids boiling a large amount of wastewater and hopefully provides a novel alternative technology for the ba recovery.

关键词： Butyl acetate recovery resin adsorption Desorption Thermodynamics Kinetics

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Enhancing corrosion resistance of plasma electrolytic oxidation coatings on AM50 Mg alloy by inhibitor containing ba(NO_(3))_(2) solutions

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International Journal of Minerals,Metallurgy and materials 2024年第9期31卷 2048-2061页

作者： Jirui ma Xiaopeng Lu Santosh Prasad Sah Qianqian Chen You Zhang Fuhui Wang Corrosion and Protection Center Northeastern UniversityShenyang110819China Faculty of Engineering Hokkaido UniversityHokkaido 060-8628Japan College of New materials and Chemical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China

To enhance the long-term corrosion resistance of the plasma electrolytic oxidation(PEO)coating on the magnesium(Mg)alloy,an inorganic salt combined with corrosion inhibitors was used for posttreatment of the *** this study,the corrosion performance of PEO-coated AM50 Mg was significantly improved by loading sodium lauryl sulfonate(SDS)and sodium dodecyl benzene sulf-onate into ba(NO_(3))_(2) post-sealing *** electron microscopy,X-ray photoelectron spectroscopy,X-ray diffraction,Fourier transform infrared spectrometer,and ultraviolet-visible analyses showed that the inhibitors enhanced the incorporation of baO_(2) into PEO *** impedance showed that post-sealing in ba(NO_(3))_(2)/SDS treatment enhanced corrosion resistance by three orders of *** total impedance value remained at 926Ω·cm^(2)after immersing in a 0.5wt%NaCl solution for 768 h.A salt spray test for 40 days did not show any obvious region of corrosion,proving excellent post-sealing by ba(NO_(3))_(2)/SDS *** corrosion resistance of the coating was enhanced through the synergistic effect of baO2 pore sealing and SDS adsorption.

关键词： Mg plasma electrolytic oxidation posttreatment corrosion resistance

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robust neutralization of SArS-CoV-2 variants including JN.1 and ba.2.87.1 by trivalent XBB vaccine-induced antibodies

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Signal transduction and Targeted Therapy 2024年第6期9卷 2359-2361页

作者： Xun Wang Shujun Jiang Wentai ma Yanliang Zhang Pengfei Wang Shanghai Pudong Hospital Fudan University Pudong Medical CenterState Key Laboratory of Genetic EngineeringMOE Engineering Research Center of Gene TechnologySchool of Life SciencesShanghai Institute of Infectious Disease and BiosecurityFudan UniversityShanghaiChina Department of Infectious Diseases Nanjing Hospital of Chinese Medicine Affiliated to Nanjing University of Chinese MedicineNanjing Research Center for Infectious Diseases of Integrated Traditional Chinese and Western MedicineNanjingJiangsuChina Beijing Institute of Genomics Chinese Academy of SciencesUniversity of Chinese Academy of Sciences and China National Center for BioinformationBeijingChina

Dear Editor,The rapid and widespread transmission of SArS-CoV-2 has led to the emergence of multiple variants of concern(VOCs),most notably the Omicron variant,which continues to evolve and diversify into a range of *** previous research has shown that these Omicron sub-lineages,spanning ba.1-ba.2.86,have been evolving to exhibit increased neutralization escape capabilities.

关键词： evolve neutralization variants

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基于动态知识流动特征的有向技术融合预测方法

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情报杂志 2024年第8期43卷 152-159,41页

作者：陈稳马亚雪巴志超李纲南京大学数据智能与交叉创新实验室南京210023 南京大学数据管理创新研究中心苏州215163 南京大学信息管理学院南京210023 武汉大学信息管理学院武汉430072

[研究目的]基于动态知识流动特征对有向的技术融合关系进行预测,有助于提高企业的研发效率及科技管理部门对科技资源的合理分配。[研究方法]首先,将IPC前4位代码作为技术单元,基于专利中主分类号与副分类号提取技术间的有向知识流动关系... 详细信息

[研究目的]基于动态知识流动特征对有向的技术融合关系进行预测,有助于提高企业的研发效率及科技管理部门对科技资源的合理分配。[研究方法]首先,将IPC前4位代码作为技术单元,基于专利中主分类号与副分类号提取技术间的有向知识流动关系;然后,借鉴关联规则挖掘算法从重要性、强度和依赖度3个维度对知识流动关系进行筛选,将满足指标阈值的知识流动关系作为有向技术融合关系;最后,将有向技术融合关系预测转化为有监督的二分类任务,以机器学习算法为模型基础,结合前两个时期的技术间知识流动特征及其时序变化特征,预测下一个时期内的技术间是否存在技术融合关系。[研究结论]增材制造领域的实证分析结果显示,以代价敏感机器学习算法为预测算法,基于前两个时期的技术间知识流动特征及其时序变化特征可以有效预测下一阶段中的技术融合。随着技术的发展,技术间的单向融合愈发频繁,并逐渐演变为技术双向融合,甚至呈现多技术融合的现象。

关键词：技术融合专利分类号知识流技术预测增材制造机器学习知识流动特征

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Bi_(2)Te_(3)基热电材料中的声子工程

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硅酸盐学报 2024年第1期52卷 203-217页

作者：刘志愿管希成李周马妮马俊杰巴倩夏爱林晋传贵安徽工业大学材料科学与工程学院安徽马鞍山243002 安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室安徽马鞍山243002 安徽大学材料科学与工程学院合肥230601 中国科学技术大学化学与材料科学学院合肥230026

Bi_(2)Te_(3)基合金因其优异的电输运性能和较低热导率在低温区热电材料中备受关注。然而由Bi_(2)Te_(3)基合金制造的热电发电或制冷器件转化效率仍较低,因此进一步提升Bi_(2)Te_(3)基材料的热电优值zT是关键。由于晶格热导率与电性能... 详细信息

Bi_(2)Te_(3)基合金因其优异的电输运性能和较低热导率在低温区热电材料中备受关注。然而由Bi_(2)Te_(3)基合金制造的热电发电或制冷器件转化效率仍较低,因此进一步提升Bi_(2)Te_(3)基材料的热电优值zT是关键。由于晶格热导率与电性能参数关联较少,在热电性能参数中较为独立,因此,在不影响电性能的前提下,通过声子工程降低晶格热导率成为提升zT值的重要方法。本文主要综述了近年来通过纳米改性、超晶格结构、纳米复合、掺杂和引入位错阵列等声子工程优化Bi_(2)Te_(3)基材料热电性能的主要研究进展。通过这些优化手段可以显著降低材料的比热容、声子群速度或声子平均自由程,Bi_(2)Te_(3)基材料的晶格热导率显著降低,热电性能大幅提升,为热电器件的应用提供科学和技术支撑。

关键词：碲化铋基热电材料声子工程晶格热导率热电性能

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