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Numerical modeling and dynamic analysis of the 2017 Xinmo landslide in Maoxian County, China

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Journal of Mountain Science 2017年第9期14卷 1701-1711页

作者： OUYANG Chao-jun ZHAO Wei HE Si-ming WANG Dong-po ZHOU Shu AN Hui-cong WANG Zhong-wen CHENG Duo-xiang Key laboratory of Mountain Hazards and surface Process &Institute of Mountain Hazards and Environment (IMHE) Chinese Academy of Sciences Chengdu 610041 China University of Chinese Academy of Sciences Beijing 100049 China center for excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing 100101 China State Key Laboratory of Geohazard Prevention and Geoenvironment protection Chengdu University of Technology Chengdu 610o59 China Sichuan engineering Research center for Emergency Mapping & Disaster Reduction/Sichuan Geomatics center Chengdu 610041 China

A catastrophic landslide occurred at Xinmo village in Maoxian County, Sichuan Province,China, on June 24, 2017. A 2.87×106 m3 rock mass collapsed and entrained the surface soil layer along the landslide path. Eighty-three people were killed or went missing and more than 103 houses were destroyed. In this paper, the geological conditions of the landslide are analyzed via field investigation and high-resolution imagery. The dynamic process and runout characteristics of the landslide are numerically analyzed using a depth-integrated continuum method and Mac Cormack-TVD finite difference *** results show that the evaluated area of the danger zone matchs well with the results of field investigation. It is worth noting that soil sprayed by the high-speed blast needs to be taken into account for such kind of large high-locality landslide. The maximum velocity is about 55 m/s, which is consistent with most cases. In addition, the potential danger zone of an unstable block is evaluated. The potential risk area evaluated by the efficient depthintegrated continuum method could play a significant role in disaster prevention and secondary hazard avoidance during rescue operations.

关键词： Xinmo landslide Runout Numerical modeling Dynamic process Potential risk Highlocality landslide

A deep learning-based method for segmentation and quantitative characterization of microstructures in weathering steel from sequential scanning electron microscope images

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Journal of Iron and Steel Research International 2022年第5期29卷 836-845页

作者： Bing Han Wei-hao Wan Dan-dan Sun Cai-chang Dong Lei Zhao Hai-zhou Wang Beijing Advanced Innovation center for Materials Genome engineering Central Iron&Steel Research InstituteBeijing100081China Qingdao NCS Testing&corrosion protection Technology Co. Ltd.Qingdao266071ShandongChina Beijing Key Laboratory of Metal Materials Characterization Central Iron&Steel Research InstituteBeijing100081China

Microstructural classification is typically done manually by human experts,which gives rise to uncertainties due to subjectivity and reduces the overall efficiency.A high-throughput characterization is proposed based on deep learning,rapid acquisition technology,and mathematical statistics for the recognition,segmentation,and quantification of microstructure in weathering *** segmentation results showed that this method was accurate and efficient,and the segmentation of inclusions and pearlite phase achieved accuracy of 89.95%and 90.86%,*** time required for batch processing by MIPAR software involving thresholding segmentation,morphological processing,and small area deletion was 1.05 s for a single *** comparison,our system required only 0.102 s,which is ten times faster than the commercial *** quantification results were extracted from large volumes of sequential image data(150 mm^(2),62,216 images,1024×1024 pixels),which ensure comprehensive *** information,such as three-dimensional density distribution and the frequency of the minimum spatial distance of inclusions on the sample surface of 150 mm^(2),were quantified by extracting the coordinates and sizes of individual features.A refined characterization method for two-dimensional structures and spatial information that is unattainable when performing manually or with software is *** will be useful for understanding properties or behaviors of weathering steel,and reducing the resort to physical testing.

关键词： Deep learning High-throughput Microstructure Sequential image Rapid acquisition Quantitative characterization Segmentation

Antifouling nanocomposite polymer coatings for marine applications:A review on experiments,mechanisms,and theoretical studies

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Journal of Materials Science & Technology 2022年第23期118卷 73-113页

作者： Sepideh Pourhashem Abdolvahab Seif Farhad Saba Elham Garmroudi Nezhad Xiaohong Ji Ziyang Zhou Xiaofan Zhai Majid Mirzaee Jizhou Duan Alimorad Rashidi Baorong Hou Key Laboratory of Marine Environmental corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China Open studio for marine corrosion and protection Pilot National Laboratory for Marine Science and TechnologyQingdao 266237China center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Nanotechnology Research center Research Institute of Petroleum Industry(RIPI)West Entrance Blvd.Olympic VillageTehranIran Department of Materials Science and engineering Engineering FacultyFerdowsi University of MashhadMashhadIran University of Chinese Academy of Sciences Beijing 100039China Non-Metallic Materials Research Group Niroo Research InstituteTehran 14665517Iran

Marine fouling is a worldwide challenge with huge damages on industrial structures,side effects on economics of industries,and environmental and safety-related *** approaches have been used for combating fouling in the marine ***,nanocomposite polymer coatings are a novel generation of antifouling coatings with merits of toxin-free chemical composition and ease of large-scale *** such as nano-metals,nano-metal oxides,metal-organic frameworks,carbon-based nanostructures,MXene,and nanoclays have antibacterial and antifouling properties in the polymer ***,these nanomaterials can improve the corrosion resistance,mechanical strength,weathering stability,and thermal resistance of the polymer ***,in this review paper,the antifouling nanocomposite coatings are introduced and antifouling mechanisms are *** review explicitly indicates that the antifouling efficiency of the nanocomposite coatings depends on the properties of the polymer matrix,the inherent properties of the nanomaterials,the weight percent and the dispersion method of the nanomaterials within the coating matrix,and the chemicals used for modifying the surface of the nanomaterials;meanwhile,the hybrids of different nanomaterials and appropriate chemical agents could be used to improve the antifouling behavior of the prepared ***,the theoretical studies are introduced to pave the way of researchers working on theantifouling coatings,and the importance of the theoretical studies and computational modeling along with the experimental research is notified to develop antifouling coatings with high efficiency.

关键词： Antifouling nanocomposite coatings Nano-metal oxides Carbon-based nanomaterials MXene and nanoclays Theoretical studies

In vitro corrosion of Mg-6Zn-IMn-4Sn-1.5Nd/0.5Y alloys

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Frontiers of Materials Science 2014年第3期8卷 230-243页

作者： Rong-Chang ZENG Lei WANG Ding-Fei ZHANG Hong-Zhi CUI En-Hou HAN College of Materials Science and engineering Shandong University of Science and Technology Qingdao 266590 China College of Materials Science and engineering Chongqing University Chongqing 400044 China National engineering center for corrosion Control Institute of Metals Research Chinese Academy of Sciences Shenyang 110016 China

The microstructure evaluation, surface morphology, chemical compositions and phase analysis of the biomedical Mg-6Zn-IMn-4Sn-1.5Nd/0.5Y （ZMT614- 1.5Nd/0.5Y） alloys were investigated by means of optical microscopy, EPMA, X-ray EDS, XRD and FTIR. The corrosion behavior was evaluated using weight-loss measurement, hydrogen evolution, electrochemical and pH measurements, The results demonstrate that the microstructure for both ZMT614-1,5Nd alloy and ZMT614-0.5Y alloy is characterized by α-Mg and intermetallic compounds, most of which are distributed along the grain boundaries. These second phases contain Mg2Zn, Mg2Zn11, Mg2Sn and single metal Mn, together with Mg12Nd phase for the ZMT614-1.5Nd alloy, and with Mg24Y5 phase for the ZMT614-0.5Y alloy. Honeycomb-like corrosion product layers form. The corrosion resistance of the ZMT614-0.5Y alloy is higher than that of the ZMT614-1.5Nd alloy, which is ascribed to the addition of the element Y into the alloy delaying the corrosion initiation in comparison to that of Nd element in the alloy.

关键词： magnesium alloy yttrium neodymium corrosion biomaterial

Geo-engineered buffer capacity of two-layered absorbing system under the impact of rock avalanches based on Discrete Element Method

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Journal of Mountain Science 2016年第5期13卷 917-929页

作者： BI Yu-zhang HE Si-ming LI Xin-po WU Yong XU Qiang OUYANG Chao-jun SU Li-Jun WANG Hao Key Laboratory of Mountain Hazards and Earth surface Process Chinese Academy of Sciences Institute of Mountain Hazards and Environment Chinese Academy of Sciences & Water Resources Ministry center for excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences State Key Laboratory of Geo-Hazard Prevention and Geo-Environment protection Chengdu University of Technology College of Environment and Resources Fuzhou University

Many rock avalanches were triggered by the Wenchuan earthquake on May 12, 2008 in southwest China. protection galleries covered with a single soil layer are usually used to protect against rockfall. Since one-layer protection galleries do not have sufficient buffer capacity, a two-layered absorbing system has been designed. This study aims to find whether an expanded poly-styrol （EPS） cushion, which is used in the soil-covered protection galleries for shock absorption, could be positioned under dynamic loadings. The dynamic impacts of the two-layered absorbing system under the conditions of rock avalanches are numerically simulated through a 2D discrete dement method. By selecting reasonable parameters, a series of numerical experiments were conducted to find the best combination for the two- layered absorbing system. The values of the EPS layer area as a percentage of the total area were set as 0% （Sl）, 22~ （S2）, and 70% （$3）. 22~ of the area of the EPS layer was found to be a reasonable value, and experiments were conducted to find the best position of the EPS layer in the two-layered absorbing system. The numerical results yield useful conclusions regarding the interaction between the impacting avalanches and the two-layered absorbing system. The soil layer can absorb the shock energy effectively and S2 （0.4-m thick EPS cushion covered with soil layer） is the most efficient combination, which can reduce the impact force, compared with the other combinations.

关键词： Discrete element method Buffer capacity Dynamic simulation Impact force Two-layered absorbing system

Advanced strategies for marine antifouling based on nanomaterial-enhanced functional PDMS coatings

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Nano Materials Science 2024年第4期6卷 375-395页

作者： Xiaohui Shi Hao Wei Wenjun Zhou Paul E.D.Soto Rodriguez Cunguo Lin Lei Wang Zhijia Zhang engineering Harbin Engineering UniversityHarbinChina Qingdao Innovation and Development center of Harbin engineering University QingdaoChina State Key Laboratory for Marin corrosion and protection Luoyang Ship Material Research Institute(LSMRI)QingdaoChina School of Chemistry and Chemical engineering Harbin Institute of TechnologyHarbinChina Instituto de Estudios Avanzados IUDEA Departamento de FísicaUniversidad de La Laguna C/Astrofísico Francisco SanchezS/n.E-38203TenerifeSpain

Marine biofouling seriously affects human marine exploitation and transportation activities,to which marine antifouling(AF)coatings are considered to be the most cost-effective *** the mid-20th century,human beings have dedicated their efforts on developing AF coatings with long cycle and high performance,leading to a large number of non-target organisms?distortion,death and marine environmental ***(PDMS),is considered as one of the representative environment-friendly AF materials thanks to its non-toxic,hydrophobic,low surface energy and AF ***,PDMS AF coatings are prone to mechanical damage,weak adhesion strength to substrate,and poor static AF effect,which seriously restrict their use in the *** rapid development of various nanomaterials provides an opportunity to enhance and improve the mechanical properties and antifouling properties of PDMS coating by embedding *** on our research background and the problems faced in our laboratory,this article presents an overview of the current progress in the fields of PDMS composite coatings enhanced by different nanomaterials,with the discussion focused on the advantages and main bottlenecks currently encountered in this ***,we propose an outlook,hoping to provide fundamental guidance for the development of marine AF field.

关键词： Nanomaterials Antifouling PDMS composites Environment-friendly Marine biofouling

Investigation of microbial corrosion inhibition of Cu-bearing 316L stainless steel in the presence of acid producing bacterium Acidithiobacillus caldus SM-1

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Journal of Materials Science & Technology 2021年第5期64卷 176-186页

作者： Yuqiao Dong Jiaqi Li Dake Xu Guangling Song Dan Liu Haipeng Wang M.Saleem Khan Ke Yang Fuhui Wang center for Marine Materials corrosion and protection College of MaterialsXiamen UniversityXiamen361005China Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang110819China School of Materials Science and engineering Hebei University of Science and TechnologyShijiazhuang050018China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen518000China Institute of Metal Research Chinese Academy of SciencesShenyang110016China

Stainless steel(SS)has unsatisfied corrosion resistance in many aggressive environments,particularly under a low p H condition in the bioleaching *** this study,through surface analyses and electrochemical measurements,the corrosion resistance of a novel Cu-bearing 316L SS was evaluated in the presence of an acid-producing bacterium,Acidithiobacillus caldus SM-1 that was able to create an extremely acidic corrosive *** significantly enhanced anti-microbiologically-inducedcorrosion performance could be explained by the intracellular reactive oxygen species(ROS)and Fenton reaction on the Cu-bearing 316L SS.

关键词： Stainless steel Acid-producing bacteria Copper ion Reactive oxygen species corrosion resistance

Insight into relationship between composition,thickness and electrochemistry behavior of oxide film formed on TA15under different potentials in 0.5 mol·L^(-1)H_(2)SO_(4)

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Rare Metals 2023年第5期42卷 1760-1772页

作者： Fei-Fei Huang Yi Qin Qing-Rui Wang Hiroaki Yoshida Lei Wen Hai Chang Ying Jin National center for Materials Service Safety University of Science and Technology BeijingBeijing100083China Innovation Group of Marine engineering Materials and corrosion Control Southern Marine Science and Engineering Guangdong LaboratoryZhuhai519080China Department of Physical Science Hiroshima UniversityHigashi-Hiroshima739-8526Japan

The oxide film formed on TA15 alloy in0.5 mol·L^(-1)H_(2)SO_(4)at different applied potentials is investigated by evaluating the film formation current density,film thickness,surface film composition,valence state,and the electrochemical *** relative quantitative spectral analysis revealed by X-ray photoelectron spectroscopy(XPS)and X-ray absorption spectra(XAS)shows that the increasing applied potential promotes the formation of thick and high-valence state *** contrasting with XAS of the reference titanium oxides,it is found that TiO_(2)within the oxide film changes from anatase type to rutile type with the potential increases to 2.00 *** oxide film formed at passive region has better protection performance,and with the increase of applied potential,the corrosion resistance of passive film increases,whereas the ND(donor density)values obtained from the Mott-Schottky(MS)results decrease with the increasing applied potential,indicating a better uniformity and protective effect of the oxide *** on above facts,the model of the oxide films formed on TA15 at different applied potentials in passive region and dissolve region is ***,the existence forms of all the TA15alloying elements under the most corrosion resistant condition are confirmed.

关键词： TA15 Electrochemical passivation corrosion behavior surface compositions and structures

Effect of Acetic Acid on Localized corrosion of Carbon Steel in Inhibited 3% NaCl Solution under CO2 Environment

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材料科学与工程（中英文版） 2010年第10期4卷 34-39页

作者： Hiroshi Honda Yasuyoshi Tomoe corrosion protection Group Technical Research Center Technical Division Inpex Corporation Tokyo 157-0061 Japan