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Journal of Earth Science 2022年第4期33卷 847-856页

作者： Xiaolin Huang Yuyang Peng Chuang Cheng Dun Wang Qiang Yao State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan 430074China

The 2021 Madoi M7.4 Earthquake in Qinghai is a major earthquake that occurred in the Bajankara Block of Qinghai-Tibet Plateau in the past 30 years,which spatially filled the seismogenic gap in the eastern section of the northern boundary of the block.Here we determined the values of M_(L),M_(S_BB),m_(B),M_(Wp),M_(WW),M_(dt),and M(GNSS)by abundant regional and global seismic and geodetic observations,which is 6.61,7.43,7.18,7.33,7.43,7.38,and 7.4,respectively.To compare the time efficiency and stability of different magnitude scales,we generated a real-time environment,to iteratively determine the magnitudes over elapsed times.Some methods such as m_(B),M_(S_BB),M_(Wp) gave considerable variations of as large as 0.5 units for the determined magnitudes with elapsed time,as more data were included.Others such as M_(WW) and M_(dt) were very stable with increasing data over time.The systematic calculations of various magnitude scales in this study quantitively evaluated the stability and accuracy of those methods,shading light on the adaptability and applicability of different magnitude scales.

关键词： the 2021 Madoi Earthquake earthquake magnitude magnitude scale earthquakes

Recent advances in chemical durability and mechanical stability of superhydrophobic materials: Multi-strategy design and strengthening

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Journal of Materials Science & Technology 2022年第34期129卷 40-69页

作者： Peng wang Changyang Li dun Zhang Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100039China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and TechnologyQingdao 266237China

Inspired by the lotus leaf effect, non-wetting artificial superhydrophobic surfaces demonstrate an enormous potential in numerous fields. However, limited by poor stability and durability, superhydrophobic surfaces are rarely available for practical applications. In this review, based on the wettability mechanisms and failure modes of superhydrophobic surfaces, it is proposed that the construction of highly stable superhydrophobic materials can be approached from four aspects, including structural design, chemical bonding, interfacial-strengthening of hydrophobic materials and substrates, and self-healing. We introduced in detail the design ideas, strengthening approaches, and characterization tools of highly stable superhydrophobic materials from the perspective of multi-strategy design and strengthening, and provided corresponding insights. Eventually, the development, current status, and prospects of highly stable and multifunctional superhydrophobic materials were also presented in detail. Recent advances and development prospects of durable superhydrophobic materials were summarized and discussed in this review,providing certain insights and design guidelines for the fabrication of stable superhydrophobic materials.

关键词： Superhydrophobicity Stability Durability Strengthening

Estimating Seismic Intensity Maps of the 2021 Mw 7.3 Madoi,Qinghai and Mw 6.1 Yangbi,Yunnan,China Earthquakes

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Journal of Earth Science 2022年第4期33卷 839-846页

作者： Wenkai Chen Dun Wang Can Zhang Qiang Yao Hongjun Si Lanzhou Institute of Seismology China Earthquake AdministrationLanzhou 730000China State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan 430074China Seismological Research Institute Inc. Tokyo 113-0032Japan

This study focuses on rapidly determining seismic intensity maps of earthquakes because it offers fundamental information for effective emergency rescue and subsequent scientific research,and remains challenging to accurately determine seismic intensity map in regions with sparse instrumental observations.Here we applied a novel method that consisted of array technology(backprojection),ground-motion prediction equations,and site corrections,to estimate the seismic intensity maps of the 2021 Mw 7.3 Madoi,Qinghai and the Mw 6.1 Yangbi,Yunnan,China earthquakes.We used seismic data recorded at European stations to back-project the source processes of the 2021 Mw7.3 Madoi,Qinghai and the Mw 6.1 Yangbi,Yunnan,China earthquakes.The back-projected energy radiations were then used as subevents or used to define the fault geometry.Summing the contributions of each subevent or estimating the shortest distances from each site to the rupture fault,we obtained the ground motion(PGA and PGV)for each site under rock site conditions.The estimated ground motions were corrected at each site for local site amplification according to the Vs30 database.Our estimated seismic intensity maps and field reports showed high similarity,which further validated the effectiveness of the novel approach,and pushed the limit of earthquake size down to~M 6.Such efforts would substantially help in the fast and accurate evaluation of earthquake damage,and precise rescue efforts.

关键词： earthquakes seismic intensity map back-projection ground-motion prediction equations

Early Report of the Source Characteristics,Ground Motions,and Casualty Estimates of the 2023 Mw 7.8 and 7.5 Turkey Earthquakes

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Journal of Earth Science 2023年第2期34卷 297-303页

作者： Wenkai Chen Gang Rao Dengjie Kang Zhifan Wan Dun Wang Lanzhou Institute of Seismology China Earthquake AdministrationLanzhou730000China School of Geoscience and Technology Southwest Petroleum UniversityChengdu610500China State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan430074China

INTRODUCTION,At 01:17 UTC(04:17 on local time)on Feb.6,2023,a devastating earthquake with a moment magnitude(Mw)7.8 occurred in the Gaziantep,southern Turkey.The earthquake was located at 37.174°N and 37.032°E,with ... 详细信息

关键词： earthquake magnitude Earthquake

Magnitude of the 23 January 2018 M7.9 Alaska Earthquake Estimated from Local Dense Seismic Records in Alaska

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Journal of Earth Science 2019年第5期30卷 1005-1009页

作者： Chen Song Qiang Yao Dun Wang Key Laboratory of Earthquake Geodesy Institute of Seismology China Earthquake Administration Wuhan 430071 China State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences China University of Geosciences Wuhan 430074 China

We apply a novel method to estimate the magnitude of the 23 January 2018 M7.9 Alaska earthquake using seismic stations recorded at local to regional distances in Alaska, US. We determine the source duration from back-projection results derived from the Alaska stations in a relatively compact azimuth range. Then we calculate the maximum P-wave displacements recorded on a wide azimuth range at distances of 8 to 15 degrees. Combining the source duration and the maximum P-wave displacements, we obtain magnitudes of 7.86–8.03 for the 23 January 2018 earthquake in 3–5 min, very close to the Mw 7.9 determined by the USGS and GCMT. This example validates the new approach for determining magnitude of large earthquakes using local to regional stations, and its time efficiency that magnitudes of large earthquakes can be accurately estimated within in 3–5 min after origin time. Therefore, further application of this new method would help accurate estimation of size of earthquakes that occur offshore and might cause tsunami hazards.

关键词： rapid magnitude estimation back-projection real-time seismology tsunami warning geophysics

Almost automorphically-forced flows on S^(1) or R in one-dimensional almost periodic semilinear heat equations

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Science China Mathematics 2022年第9期65卷 1875-1894页

作者： Wenxian Shen Yi wang dun Zhou Department of Mathematics and Statistics Auburn UniversityAuburnAL 36849USA School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026China School of Mathematics and Statistics Nanjing University of Science and TechnologyNanjing 210094China

In this paper,we consider the asymptotic dynamics of the skew-product semiflow generated by the following time almost periodically-forced scalar reaction-diffusion equation:u_(t)=u_(xx)+f(t,u,u_(x)),t>0,0 详细信息

关键词： non-autonomous parabolic equation almost automorphically-forced circle flow function of the number of zeros minimal set ω-limit set

Paleo-Earthquakes along the Zheduotang Fault,Xianshuihe Fault System,Eastern Tibet:Implications for Seismic Hazard Evaluation

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Journal of Earth Science 2022年第5期33卷 1233-1245页

作者： Guifan Chen Mervin Bartholomew Demin Liu Kai Cao Minxuan Feng Dun Wang School of Earth Sciences China University of GeosciencesWuhan 430074China Three Gorges Geotechnical Consultants Co. Ltd.Wuhan 430074China Department of Earth Sciences University of MemphisMemphisTN38152USA Xi’an Center of Geological Survey China Geological SurveyXi’an710054China

The Kangding City in eastern Tibet is at high risk due to frequent strong earthquakes along the Xianshuihe sinistral strike-slip fault bounding the Chuandian Block to the northeast.The knowledge of paleo-seismicity recurrence along this fault system is key to the evaluation of earthquake hazards in this region;thus,more accurate paleoseismic information are required.We examined the paleo-seismicity along the Zheduotang fault in the central segment of the Xianshuihe fault system by applying the field investigation,trenching,and Quaternary dating methods(e.g.,OSL and ^(14)C).Field observations found~8.5 m offset of stream by sinistral slip along the Zheduotang fault.We trenched the central fault zone of the Zheduotang fault and found that the colluvial wedges and five buried,discontinuous,A-soil horizons progressively have been offset in the shallow graben on the SW-side of the main fault indicative of the paleo-earthquakes.The dating results of OSL and ^(14)C,in line with existing data,enable us to establish the paleo-seismic history of the Zheduotang fault.It shows at least eight surface ruptures in the last 7500 years identified from displaced buried soils,colluvial wedges and terraces.Our study reveals~100 years minimum paleo-earthquake recurrence,suggesting potential large earthquakes in the Kangding area in the future.

关键词： Tibetan Plateau Xianshuihe fault system paleo-seismicity trench recurrence geophysics

Bifunctional nanozyme activities of layered double hydroxide derived Co-A1-Ce mixed metal oxides for antibacterial application

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Journal of Oceanology and Limnology 2020年第4期38卷 1233-1245页

作者： CHEN Chao wang Yi ZHANG dun CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Open Studio for Marine Corrosion and Protection Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Marine biofouling is an expensive problem that needs evolved chemical or physical antifouling strategies.However,most of the current antifouling materials that would damage the environment through metal leaching and bacteria resistance are being halted.Nanozyme is one kind of environmental antifouling materials through generating reactive oxygen species(ROS).We prepared various contents of CeO2 that could uniform disperse compounding with Co3 O4 and CoAl2 O4 to form a stable Co-Al-Ce mixed metal oxide(MMO) by a layered double hydroxide derived method.We find that coupling with CeO2 can improve the peroxidase(POx) activity.When the molar ratio of Ce is 2.5% and the calcination temperature is 200℃,the POx activity of Co-Al-Ce MMO is the best caused by the good dispersion of catalytically active components and the high specific area(150.10±4.95 m2/g).This novel Co-Al-Ce MMO also exhibits an antibacterial mode of action Gram-negative bacteria in near-neutral pH solution through generating ROS(mainly ·O2-)in the presence of H2 O2.Ce containing MMO can be utilized as potential green marine antifouling material.

关键词： mixed metal oxide ceria enzyme mimic antibacterial marine biofouling

Smart anticorrosion coating based on stimuli-responsive micro/nanocontainer:a review

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Journal of Oceanology and Limnology 2020年第4期38卷 1045-1063页

作者： CAI Haoyuan wang Peng ZHANG dun CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Smart coating for corrosion protection of metal materials(steel,magnesium,aluminum and their alloys)has drawn great attention because of their capacity to prevent crack propagation in the protective coating by releasing functional molecules(healing agents or corrosion inhibitors)on demand from delivery vehicle,that is,micro/nanocontainer made up of a shell and core material or a coating layer,in a controllable manner.Herein,we summarize the recent achievements during the last 10 years in the field of the micro/nanocontainer with different types of stimuli-responsive properties,i.e.,pH,electrochemical potential,redox,aggressive corrosive ions,heat,light,magnetic field,and mechanical impact,for smart anticorrosion coating.The state-of-the-art design and fabrication of micro/nanocontainer are emphasized with detailed examples.

关键词： corrosion protection micro/nanocontainer stimuli-responsive smart anticorrosion coating

Advances in BeiDou Navigation Satellite System(BDS)and satellite navigation augmentation technologies

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Satellite Navigation 2020年第1期1卷 126-148页

作者： Rui Li Shuaiyong Zheng Ershen wang Jinping Chen Shaojun Feng Dun Wang Liwen Dai School of Electronic and Information Engineering Beihang UniversityNo.37 Xueyuan RoadHaidian DistrictBeijingChina Suzhou Institute Beihang UniversitySuzhou 215200China College of Electronic and Information Engineering Shenyang Aerospace UniversityNo.37 Daoyi South StreetDaoyi DistrictShenyangChina Beijing Satellite Navigation Center No.22 Beiqing RoadHaidian DistrictBeijingChina Qianxun Spatial Intelligence Inc. C5 BuildingNo.1688-38 North Guoquan RoadYangpu DistrictShanghaiChina Space Star Technology Co. Ltd.Blue Lake Industry ParkHaidian DistrictBei-jingChina John Deere-Intelligent Solution Group 20780 Madrona AvenueTorranceCAUSA

Several noteworthy breakthroughs have been made with the BeiDou Navigation Satellite System(BDS)and other global navigation satellite systems as well as the associated augmentation systems,such as the commissioning of the BDS-3 preliminary system and the successful launch of the first BDS-3 GEO satellite which carries the satellite-based augmentation payload.Presently,BDS can provide basic services globally,and its augmentation system is also being tested.This paper gives an overview of BDS and satellite navigation augmentation technologies.This overview is divided into four parts,which include the system segment technologies,satellite segment technologies,propagation segment technologies,and user segment technologies.In each part,these technologies are described from the perspectives of preliminary information,research progress,and summary.Moreover,the significance and progress of the BeiDou Satellite-based Augmentation System(BDSBAS),low earth orbit augmentation,and the national BeiDou ground-based augmentation system are presented,along with the airborne-based augmentation system.Furthermore,the conclusions and discussions covering popular topics for research,frontiers in research and development,achievements,and suggestions are listed for future research.

关键词： BeiDou Navigation Satellite System Satellite navigation augmentation systems System segment technologies Satellite segment technologies Propagation segment technologies User segment technologies