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Acta Metallurgica Sinica(English Letters) 2023年第5期36卷 745-757页

作者： Xin Wei yupeng sun Junhua Dong Nan Chen Qiying Ren Wei Ke Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China Environmental Corrosion Centre of Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

The present work focused on investigating the corrosion behavior of NiCu low alloy steel in 0.05 M NaHCO_(3) solutions with different Cl−concentrations under the aerobic–anoxic *** results showed that NiCu steel tended to be pseudo-passivated in the solutions of 0.05 M NaHCO_(3) and 0.05 M NaHCO_(3)+0.01 M NaCl exposed to *** cathodic process transformed from oxygen reduction to the common reduction of oxygen andα-FeOOH,while the anodic process was the iron *** Cl^(−)increased to 0.1 M,the steel tended to be activity *** to the blocking effect of rust layer on the oxygen,the cathodic process transformed to the reduction ofα-*** the solutions were deoxidized,the cathodic process was controlled by only rust ***,both the cathodic process and anodic process of NiCu steel corrosion were significantly *** the whole aerobic–anoxic immersion,the corrosion rate of NiCu steel increased with Cl^(−)*** was not only related to the promotion of Cl^(−)on the anodic dissolution of steel,but also related to the cathodic reduction of moreα-FeOOH generated,which could accelerate the cathodic process.

关键词： Low alloy steel Aerobic-anoxic condition Corrosion behavior Corrosion products Electrochemical measurements

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前沿椎间融合器产品评价关注重点研究

生物骨科材料与临床研究 2024年第2期21卷 82-87页

作者：高娜张博孙钰朋李帆杨蕊山东省医疗器械和药品包装检验研究院国家药品监督管理局生物材料器械安全性评价重点实验室山东济南250000

本文对前沿椎间融合器产品的评价关注重点展开研究。作为脊柱退行性疾病手术治疗中使用最多的脊柱内植入物之一,椎间融合器的安全性和有效性一直是大家关注和研究的热点。本文分析研究了目前国内外前沿椎间融合器新型结构设计、3D打印... 详细信息

本文对前沿椎间融合器产品的评价关注重点展开研究。作为脊柱退行性疾病手术治疗中使用最多的脊柱内植入物之一,椎间融合器的安全性和有效性一直是大家关注和研究的热点。本文分析研究了目前国内外前沿椎间融合器新型结构设计、3D打印工艺、新型制造材料的特点,针对椎间融合器的以上特性提出风险点,并结合其使用安全性和有效性提出质量评价建议,以期为椎间融合器科学研究和检验工作中的质量评价提供参考。

关键词：椎间融合器骨科植入物 3D打印生物材料

Understanding the role of alloyed Ni and Cu on improving corrosion resistance of low alloy steel in the simulated Beishan groundwater

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Journal of Materials Science & Technology 2022年第35期130卷 124-135页

作者： yupeng sun Xin Wei Junhua Dong Nan Chen Hanyu Zhao Qiying Ren Wei Ke School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Environmental Corrosion Centre of Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The corrosion behavior of NiCu low alloy steel and Q235 low carbon steel as the candidate materials for geological disposal containers of high-level radioactive waste in the simulated Beishan groundwater was comparatively studied by weight loss test,electrochemical measurements,scanning electron microscope(SEM),electron probe microanalysis(EPMA),X-ray diffraction(XRD),Raman spectrum and X-ray photoelectron spectroscopy(XPS).The electrochemical results showed that the corrosion potential of NiCu steel and Q235 steel gradually increased with the immersion ***,the cathodic process transited from hydrogen evolution reaction(HER) control to the rust reduction control,while the anodic process was always dominated by the active dissolution of *** comparison,both the cathodic resistance and the anodic dissolution resistance of NiCu steel corrosion were apparently higher than that of Q235 *** results of rust layer characterization indicated that Ni and Cu elements could be enriched in the inner rust layer of NiCu steel and the rust layer was more *** the main corrosion products,the content of α-FeOOH in the rust layer of NiCu steel was obviously increased more than that of Q235 ***_(6)(OH)_(12)SO_(4)stably existed in the corrosion products of NiCu steel because Ni(Ⅱ) or Cu(Ⅱ)could substitute Fe(Ⅱ) of Fe_(6)(OH)_(12)SO_(4)and increased its oxidation resistance,Moreover,Ni and Cu could also make Fe3O4ionic selective by *** the long-term immersion,the corrosion mass loss of NiCu steel was significantly lower than Q235 steel,which further confirmed the benefits of Ni and Cu alloying on improving the steel corrosion resistance.

关键词： Deep geological disposal Container material Groundwater Corrosion behavior Electrochemical measurement

Influence of Deteriorated Bentonite Sediments on the Corrosion Behavior of NiCu Low Alloy Steel

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Acta Metallurgica Sinica(English Letters) 2022年第6期35卷 1011-1022页

作者： Xin Wei Junhua Dong yupeng sun Nan Chen Qiying Ren Madhusudan Dhakal Xiaofang Li Wei Ke Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Environmental Corrosion Centre of Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

The corrosion evolution of steel disposal container largely depends on the evolution of surrounding bentonite environment in the long-term geological disposal of high-level radioactive wastes. This study focused on the influence of the deteriorated bentonite sediments on the corrosion behavior of NiCu low alloy steel in the top supernatant and bottom slurry formed by Gaomiaozi bentonite and 0.05 M NaHCO_(3) + 0.1 M NaCl + 0.1 M Na_(2)SO_(4) solution. In the top supernatant, the cathodic process of the steel corrosion was transformed from the reduction in oxygen to the reduction in ferric corrosion products with time as same as that in the blank solution. While in the bottom bentonite slurry, the cathodic process always maintained as the hydrogen evolution reaction due to the coverage of more bentonite sediments. Meanwhile, the corrosion rate of NiCu steel was obviously decreased. In addition, the localized corrosion tendency of the steel could also be reduced by the large amount of deteriorated bentonite sediments.

关键词： Low alloy steel Bentonite Corrosion behavior Corrosion products Electrochemical impedance spectroscopy(EIS)

Storm Liquefaction Deposits:A Possibility of Time Reversal in Sedimentary Strata of an Estuarial Coastal Area

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Journal of Ocean University of China 2024年第4期23卷 961-969页

作者： XU Guohui REN yupeng HU Guanghai LIU Zhiqin sun Yongfu LIN Lin Key Laboratory of Marine Environment and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of EducationOcean University of ChinaQingdao 266100China First Institute of Oceanography Ministry of Natural ResourceQingdao 266061China National Deep Sea Center Qingdao 266237China

In the sedimentary strata dating of estuarial coastal areas,it is often found that there is phenomenon of time-reversal in *** seabed sediments could be liquefied under storm waves.A laboratory wave flume experiment demonstrated that storm-induced liquefaction deposits are formed by the oscillations of liquefied *** this paper,the particle size distribution and ^(210)Pb_(ex) specific activity of the sediment samples from the liquefaction disturbed zone and adjacent stable zone of the Yellow River Delta were *** stratigraphic divisions based on storm liquefaction deposit sequence can effectively explain the vertical changes in particle size and ^(210)Pb_(ex) specific *** to the differentiation of particles during the storm induced liquefaction,coarse and fine particles regrouped,which could explain the phenomenon of time-reversal in dating data.

关键词： ^(210)Pb_(ex)specific activity liquefaction deposition reversal sediment

Plasmon coupling-driven enhanced high-order multiphoton excited fluorescent performance of metal-organic frameworks

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Nano Research 2024年第7期17卷 6502-6508页

作者： Tong Meng Bo Li Linlin Zeng Xianshun sun yupeng Tian Hongping Zhou Meng Zhou Dandan Li Institutes of Physical Science and Information Technology Key Laboratory of Structure and Functional Regulation of Hybrid MaterialsMinistry of EducationAnhui UniversityHefei 230601China School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China

Accessing high-order multiphoton excited fluorescence(H-MPEF)materials is challenging yet and needs complicated synthesis *** this study,we successfully assembled plasmonic Au nanorods(Au NRs)with multiphoton responsive metalorganic frameworks(MOFs),resulting in a significant several-fold enhancement of *** extent of multiphoton enhancement was found to be strongly dependent on the degree of overlap between the multiphoton excitation wavelength of MOFs and the localized surface plasmon resonance absorbance of Au NRs,indicating the importance of plasmon-induced resonance energy ***,plasmon-induced hot electron transfer played a vital role in enhanced multiphoton activity as ***,the optimum H-MPEF enhancement occurs at the second near-infrared(NIR-II)region,which provides a promising platform for fluorescent *** findings provide a feasible and practical method to fabricate optimized H-MPEF materials for biological imaging using tissue-penetrating NIR-II light.

关键词： metal-organic framework(MOF) plasmon resonance multiphoton activity fluorescence imaging

Accuracy Analysis and Design of A3 Parallel Spindle Head

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Chinese Journal of Mechanical Engineering 2016年第2期29卷 239-249页

作者： NI Yanbing ZHANG Biao sun yupeng ZHANG Yuan School of Mechanical Engineering Tianjin University Tianjin 300072 China China Faw Group Corporation R&D Center Changchun 130000 China

As functional components of machine tools, parallel mechanisms are widely used in high efficiency machining of aviation components, and accuracy is one of the critical technical indexes. Lots of researchers have focused on the accuracy problem of parallel mechanisms, but in terms of controlling the errors and improving the accuracy in the stage of design and manufacturing, further efforts are required. Aiming at the accuracy design of a 3-DOF parallel spindle head（A3 head）, its error model, sensitivity analysis and tolerance allocation are investigated. Based on the inverse kinematic analysis, the error model of A3 head is established by using the first-order perturbation theory and vector chain method. According to the mapping property of motion and constraint Jacobian matrix, the compensatable and uncompensatable error sources which affect the accuracy in the end-effector are separated. Furthermore, sensitivity analysis is performed on the uncompensatable error sources. The sensitivity probabilistic model is established and the global sensitivity index is proposed to analyze the influence of the uncompensatable error sources on the accuracy in the end-effector of the mechanism. The results show that orientation error sources have bigger effect on the accuracy in the end-effector. Based upon the sensitivity analysis results, the tolerance design is converted into the issue of nonlinearly constrained optimization with the manufacturing cost minimum being the optimization objective. By utilizing the genetic algorithm, the allocation of the tolerances on each component is finally determined. According to the tolerance allocation results, the tolerance ranges of ten kinds of geometric error sources are obtained. These research achievements can provide fundamental guidelines for component manufacturing and assembly of this kind of parallel mechanisms.

关键词： A3 head error model sensitivity analysis tolerance allocation

A self-adaptive correction method for perspective distortions of image

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Frontiers of Computer Science 2019年第3期13卷 588-598页

作者： Lihua WU Qinghua SHANG yupeng sun Xu BAI School of Measurement and Communication Harbin University of Science and Technology Harbin 150080 China

Frequently, the shooting angles available to photograph an object are limited, and the resultant images contain perspective distortions. These distortions make more difficult to perform subsequent tasks like feature extraction and information identification. This paper suggested a perspective correction method that extracts automatically distortion features through edge detection. Results showed that this method is powerful in correcting images with perspective distortions. The corrected image has virtually little information missing, clear features and high recovery rate.

关键词： perspective correction perspective transformation Hough transform edge detection

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脉冲电流对电化学除氯的影响

装备环境工程 2024年第5期21卷 150-156页

作者：李冬韵孙玉朋王长罡陈昊男唐军务历峰赵楠郭泉忠赵茹中国科学院金属研究所沈阳110000 中国科技大学材料科学与工程学院沈阳110000 海军勤务学院天津300000 中铁三局集团电务工程有限公司天津300000 北京市昌平区河湖生态环境服务中心北京102200

目的探究不同电流密度下,直流和脉冲2种电流模式对钢筋混凝土电化学除氯的影响,降低钢筋渗氢量,减小通电后阴极产生的氢气使钢筋发生氢脆的风险,提高除氯效率,改善电化学除氯效率的均匀性。方法通过在电流密度为2、3、4A/m2的条件下,对... 详细信息

目的探究不同电流密度下,直流和脉冲2种电流模式对钢筋混凝土电化学除氯的影响,降低钢筋渗氢量,减小通电后阴极产生的氢气使钢筋发生氢脆的风险,提高除氯效率,改善电化学除氯效率的均匀性。方法通过在电流密度为2、3、4A/m2的条件下,对混凝土进行直流和脉冲电流电化学修复,测定处理后的钢筋的释氢电流,计算释氢总电量,来表示钢筋渗氢量,对比处理后强电流区和弱电流区混凝土的氯离子含量,分析2种方式除氯效率的均匀性,同时用扫描电子显微镜观察电化学除氯前后混凝土的微观结构。结果计算得到不同通电电流密度下钢筋的释氢总电量和除氯效率,脉冲电流的释氢总电量比直流电流低约20%,而除氯效率提高了约10%。结论增加电流密度可以提高除氯效率,但是会增加钢筋发生氢脆的风险。相较于直流电流,脉冲电流电化学修复可以降低钢筋渗氢量,显著提高弱电流区的除氯效率,从而改善除氯效率的均匀性。

关键词：脉冲电流电化学除氯氢脆电流密度混凝土腐蚀

Metallic and ferromagnetic MoS2 nanobelts with vertically aligned edges

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Nano Research 2015年第9期8卷 2946-2953页

作者： Guanchen Xu Xinsheng Wang yupeng sun Xiao Chen Jingying Zheng Lifei sun Liying Jiao Jinghong Li Department of Chemistry Tsinghua University Beijing 100084 China Key Laboratory of Colloid and Interface Chemistry Shandong University Jinan 250100 China

Edge effects are predicted to significantly impact the properties of low dimensional materials with layered structures. The synthesis of low dimensional materials with copious edges is desired for exploring the effects of edges on the band structure and properties of these materials. Here we developed an approach for synthesizing MoS2 nanobelts terminated with vertically aligned edges by sulfurizing hydrothermally synthesized MoO3 nanobelts in the gas phase through a kinetically driven process; we then investigated the electrical and magnetic properties of these metastable materials. These edge-terminated MoS2 nanobelts were found to be metallic and ferromagnetic, and thus dramatically different from the semiconducting and nonmagnetic two-dimensional （2D） and three-dimensional （3D） 2H-MoS2 materials. The transitions in electrical and magnetic properties elucidate the fact that edges can tune the properties of low dimensional materials. The unique structure and properties of this one-dimensional （1D） MoS2 material will enable its applications in electronics, spintronics, and catalysis.

关键词： MoS2 two-dimensional (2D)atomic crystal,nanobelt,edge effect,metallic,ferromagnetic