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13th International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering (QR2MSE 2023)

作者： L. Li Z. Wang N. Yang Q. Wu H. Wang Z. Mao K. Ren Q. Wang Y. Wang National Key Laboratory of Strength and Structural Integrity School of Aeronautic Science and Engineering Beihang University Beijing People's Republic of China Shenyang Aircraft Design and Research Institute Shenyang People's Republic of China Institute of Spacecraft System Engineering China Academy of Space Technology Beijing People's Republic of China Navigation Instrument Research Institute Tianjin People's Republic of China Beijing Institute of Control Engineering Beijing People's Republic of China

ISBN: (数字)9781839539275

With the extension of the service time of the structure and the worse service temperature conditions, the drift problem of hightemperature strain gauges gradually becomes prominent. This research aims to address the issue of the drift of measurement results because of the performance degradation of high-temperature strain gauges, and investigate the drift law under different temperatures considering complex service environments. In this paper, a combination of experimental research and theoretical analysis is utilized to design and conduct the accelerated performance degradation test on high-temperature strain gauges. Based on the result of the test, an accelerated performance degradation model is developed using the Wiener process and Arrhenius model. Finally, estimation curves for the average value and percentile value of the performance parameters of the hightemperature strain gauges are obtained, which demonstrates that the established accelerated performance degradation model can reasonably describe the degradation law. Additionally, the established accelerated performance degradation model enables effective analysis and compensation of gauge drift at any temperature.

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Spectral-Driven Pansharpening Using Adaptive Image Segmentation to Reduce Color Distortion

Spectral-Driven Pansharpening Using Adaptive Image Segmentat...

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IEEE International Geoscience and Remote Sensing Symposium

作者： Jiao Jiao Xiangwu Gong Lingda Wu Xiangli Meng Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering University Beijing China

Extraction and injection of spatial details from the panchromatic (PAN) image and preservation of the spectral characteristics of the multispectral (MS) image are the key issues in pansharpening methods, which are of great significance for the application of image interpretation and target recognition. In this paper, a spectral-driven pansharpening method in which the injection detailed coefficients are estimated over each component segmented by the adaptive K-means algorithm is proposed. The pansharpening method relies on a multi-resolution framework, generalized Laplacian pyramid (GLP) technique, which is applied for the extraction of detail image. The fused image is used as the feedback element, its distance from the original MS image is used to adjust the number of segments adaptively so as to reduce the spectral distortion. Experiments carried out on GeoEye-1 and QuickBird data sets demonstrate the efficiency and effectiveness of our proposed method.

关键词： Image segmentation Spatial resolution Satellites Estimation Nonlinear distortion

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The Interplay Between Collisionless Magnetic Reconnection and Turbulence

arXiv

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arXiv 2024年

作者： Stawarz, Julia E. Muñoz, P.A. Bessho, N. Bandyopadhyay, R. Nakamura, T.K.M. Eriksson, S. Graham, D. Büchner, J. Chasapis, A. Drake, J. Shay, M.A. Ergun, R.E. Hasegawa, H. Khotyaintsev, Yu V. Swisdak, M. Wilder, F. Department of Mathematics Physics and Electrical Engineering Northumbria University Ellison Building Newcastle upon TyneNE1 8ST United Kingdom Center for Astronomy and Astrophysics Technical University of Berlin Berlin10623 Germany Max Planck Institute for Solar System Research Göttingen37077 Germany Department of Astronomy University of Maryland College ParkMD20742 United States NASA Goddard Space Flight Center GreenbeltMD20771 United States Department of Astrophysical Sciences Princeton University PrincetonNJ08544 United States Space Research Institute Austrian Academy of Sciences Graz8042 Austria Krimgen LLC Hiroshima7320828 Japan Laboratory for Atmospheric and Space Physics University of Colorado BoulderCO United States Swedish Institute of Space Physics Uppsala Sweden Center for Astronomy and Astrophysics Technical University Berlin Berlin10623 Germany Laboratory for Atmospheric and Space Physics BoulderCO United States Institute for Research in Electronics and Applied Physics University of Maryland College ParkMD20740 United States Department of Physics The Institute for Physical Science and Technology The Joint Space Institute University of Maryland College ParkMD20740 United States Department of Physics and Astronomy University of Delaware NewarkDE19716 United States Laboratory for Atmospheric and Space Physics University of Colorado at Boulder BoulderCO United States Department of Astrophysical and Planetary Sciences University of Colorado at Boulder BoulderCO United States Institute of Space and Astronautical Science JAXA Sagamihara Japan IRF Swedish Institute of Space Physics Uppsala Sweden Institute for Research in Electronics and Applied Physics University of Maryland College ParkMD United States University of Texas at Arlington ArlingtonTX United States

Alongside magnetic reconnection, turbulence is another fundamental nonlinear plasma phenomenon that plays a key role in energy transport and conversion in space and astrophysical plasmas. From a numerical, theoretical, and observational point of view there is a long history of exploring the interplay between these two phenomena in space plasma environments;however, recent high-resolution, multi-spacecraft observations have ushered in a new era of understanding this complex topic. The interplay between reconnection and turbulence is both complex and multifaceted, and can be viewed through a number of different interrelated lenses - including turbulence acting to generate current sheets that undergo magnetic reconnection (turbulence-driven reconnection), magnetic reconnection driving turbulent dynamics in an environment (reconnection-driven turbulence) or acting as an intermediate step in the excitation of turbulence, and the random diffusive/dispersive nature of magnetic field lines embedded in turbulent fluctuations enabling so-called stochastic reconnection. In this paper, we review the current state of knowledge on these different facets of the interplay between turbulence and reconnection in the context of collisionless plasmas, such as those found in many near-Earth astrophysical environments, from a theoretical, numerical, and observational perspective. Particular focus is given to several key regions in Earth’s magnetosphere - Earth’s magnetosheath, magnetotail, and Kelvin-Helmholtz vortices on the magnetopause flanks - where NASA’s Magnetospheric Multiscale mission has been providing new insights on the topic. Copyright © 2024, The Authors. All rights reserved.

关键词： NASA

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Nb-Ta Fractionation by Amphibole and Biotite During Magmatic Evolution: Implications for the Low Nb/Ta Ratios of Continental Crust

SSRN

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SSRN 2022年

作者： Tan, Dong-Bo Li, Dong-Yong Xiao, Yilin Dai, Li-Qun Li, Wang-Ye Hou, Zhenhui CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Hefei230026 China Frontiers Science Center for Deep Ocean Multispheres and Earth System Key Lab of Submarine Geosciences and Prospecting Techniques MOE and College of Marine Geosciences Ocean University of China Qingdao266100 China CAS Center of Excellence in Comparative Planetology Hefei230026 China

How did the low niobium/tantalum (Nb/Ta) ratios of continental crust form is a hotly debated issue？ Here, we report the Nb-Ta features of a well-characterized magmatic rock series, mainly composed of amphibole and biotite cumulates, from the Northern Dabie orogenic belt in China. The Nb/Ta ratios of whole-rock (19.5–26.2), amphibole (16.8–41.1), and biotite (21.1–49.6) are negatively correlated with their Mg# values, indicating that the separation of amphibole and biotite could not only cause Nb-Ta fractionation but also reduce the Nb/Ta ratios of residual magmas during magmatic evolution. Furthermore, we compile the Nb/Ta ratios of global arc magmas (n=15696) to examine the role of amphibole and biotite in the differentiation of arc magmas. The Nb/Ta ratios of global arc magmas display a negative correlation with SiO2 contents and positive correlations with Dy/Yb and Ba/Rb ratios. Additionally, the compositions of the upper continental crust (UCC) exactly fall on the evolution line of Nb/Ta vs. SiO2 and Nb/Ta vs. Ba/Rb, yet significantly falls below the evolution line of Nb/Ta vs. Dy/Yb. These observations show that amphibole and biotite are two important magmatic phases necessary for processes of arc magma differentiation and that they play a role together in the formation of low Nb/Ta ratios of the continental crust. As a whole, we suggest that amphibole- and biotite-rich rocks stored in the deep crust are one of the potential hidden reservoirs with higher Nb/Ta ratios, which may contribute to the depleted Nb during the formation process of continental crust. © 2022, The Authors. All rights reserved.

关键词： Silica

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Improving cost–benefit analyses for health-considered climate mitigation policymaking

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Nature Climate Change 2025年 1-10页

作者： Jianxiang Shen Wenjia Cai Shihui Zhang Mengzhen Zhao Chi Zhang Can Wang Department of Earth System Science Ministry of Education Key Laboratory for Earth System Modeling Institute for Global Change Studies Tsinghua University Beijing China School of Ecology and Environment Renmin University of China Beijing China School of Management Beijing Institute of Technology Beijing China School of Global Governance Beijing Institute of Technology Beijing China State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC) School of Environment Tsinghua University Beijing China

There is growing discussion about enhancing climate policy efficiency by prioritizing health, with expectations for including health co-benefits in the next round of nationally determined contribution updates. Critical to this effort is the need to compare the benefits to the costs of mitigation. Here we synthesize the current cost-effectiveness of climate policies based on health-included cost–benefit analyses and identify key research challenges and opportunities for scaling up health-considered or even health-centred climate policies. Furthermore, we show factors essential to accelerating the development and implementation of mitigation policies, including providing tangible and policy-relevant health co-benefits, promoting interdisciplinary contributions and cross-sector policy engagement, conducting regional studies and improving inter-study comparability, and exploring health-considered optimized strategies.

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Coupled Pacific Rim megadroughts contributed to the fall of the MingDynasty’s capital in 1644 CE

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science Bulletin 2024年第19期69卷 3106-3114页

作者： Feng Chen Tao Wang Xiaoen Zhao Jan Esper Fredrik Charpentier Ljungqvist Ulf Büntgen Hans W.Linderholm David Meko Hongna Xu Weipeng Yue Shijie Wang Yujiang Yuan Jingyun Zheng Wei Pan Fidel Roig Martín Hadad Mao Hu Jiachang Wei Fahu Chen Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security Institute of International Rivers and Eco-SecurityYunnan UniversityKunming 650504China Southwest United Graduate School Kunming 650504China Climate Change Research Center and Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Department of Geography Johannes Gutenberg UniversityMainz 55099Germany Global Change Research Institute(CzechGlobe) Czech Academy of SciencesBrno 60300Czech Republic Department of History Stockholm UniversityStockholm 10691Sweden Bolin Centre for Climate Research Stockholm UniversityStockholm 10691Sweden Swedish Collegium for Advanced Study LinneanumUppsala 75238Sweden Department of Geography University of CambridgeCambridge CB23ENUK Department of Geography Faculty of ScienceMasaryk UniversityBrno 61137Czech Republic Swiss Federal Research Institute(WSL) Birmensdorf 8903Switzerland Regional Climate Group Department of Earth SciencesUniversity of GothenburgGothenburg 40530Sweden Laboratory of Tree-Ring Research University of ArizonaTucson AZ 85721USA Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC FEMD) Nanjing University of Information Science and TechnologyNanjing 210044China Key Laboratory of Tree-ring Physical and Chemical Research Institute of Desert MeteorologyChina Meteorological AdministrationUrumqi 830002China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory of Digital Human Technology R&D and Application of Yunnan Provincial Department of Education Yunnan UniversityKunming 650504China Laboratorio de Dendrocronología e Historia Ambiental IANIGLA-CCT CONICET-Universidad Nacional de CuyoMendoza 5500Argentina Hémera Centro de Observación de La Tierra Escuela de Ingeniería ForestalFacultad de CienciasUniversidad MayorHuechuraba 85

Historical documents provide evidence for regional droughts preceding the political turmoil and fall of Beijing in 1644 CE,when more than 20 million people died in northern China during the late Ming famine ***,the role climate and environmental changes may have played in this pivotal event in Chinese history remains ***,we provide tree-ring evidence of persistent megadroughts from1576 to 1593 CE and from 1628 to 1644 CE in northern China,which coincided with exceptionally cold summers just before the fall of *** analysis reveals that these regional hydroclimatic extremes are part of a series of megadroughts along the Pacific Rim,which not only impacted the ecology and society of monsoonal northern China,but likely also exacerbated external geopolitical and economic *** finding is corroborated by last millennium reanalysis data and numerical climate model simulations revealing internally driven Pacific sea surface temperature variations and the predominance of decadal scale La Ni?a-like conditions to be responsible for precipitation decreases over northern China,as well as extensive monsoon regions in the *** teleconnection patterns provide a mechanistic explanation for reoccurring drought spells during the late Ming Dynasty and the environmental framework fostering the fall of Beijing in 1644 CE,and the subsequent demise of the Ming Dynasty.

关键词： Paleoclimate Beijing Precipitation reconstruction Climate-society interactions Tree rings Ming Dynasty

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Estimation of economic loss by earthquakes in Taiwan Region

npj Natural Hazards

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npj Natural Hazards 2024年第1期1卷 1-8页

作者： Yang Shi Zhenguo Zhang Yilong Li Department of Earth and Space Sciences Southern University of Science and Technology Shenzhen China Institute of Risk Analysis Prediction & Management (Risk-X) Southern University of Science and Technology Shenzhen China Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology Southern University of Science and Technology Shenzhen China School of National Safety and Emergency Management Beijing Normal University Zhuhai China Joint International Research Laboratory of Catastrophe Simulation and Systemic Risk Governance Beijing Normal University Zhuhai China

Earthquakes in the Taiwan region have caused significant economic losses. We develop a model to assess seismic economic losses in the Taiwan region using the records of economic losses caused by historical earthquakes. Unlike existing models, we introduce Gross National Income Per Capita (GNIPC) as a parameter that responds to the influence of socio-economic development. The results show that our model can accurately estimate the earthquake economic losses in Taiwan region. The difference between the results of this model and those of existing models is evident, indicating differences between the Taiwan region and mainland China regarding geological background, seismic tectonics, and social resistance to earthquakes. The prediction results also imply that the society significantly underestimates the seismic economic losses in the Taiwan region. Our model can help the Taiwan region in disaster prevention and preparedness, contingency planning, allocation of relief resources, and post-disaster socio-economic recovery.

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Developing a rapid assessment framework for China earthquake disaster losses: insights from physical simulations of the Yangbi earthquake

npj Natural Hazards

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npj Natural Hazards 2024年第1期1卷 1-9页

作者： Yilong Li Zhenguo Zhang Xiaofei Chen Joint International Research Laboratory of Catastrophe Simulation and Systemic Risk Governance Beijing Normal University Zhuhai China School of National Safety and Emergency Management Beijing Normal University Zhuhai China Department of Earth and Space Sciences Southern University of Science and Technology Shenzhen China Institute of Risk Analysis Prediction and Management Southern University of Science and Technology Shenzhen China Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology Southern University of Science and Technology Shenzhen China

Earthquakes remain unpredictable and pose significant challenges to disaster preparedness. This study develops a rapid assessment framework for earthquake disaster losses based on physical simulations, demonstrated through analysis of the 2021 Ms 6.4 Yangbi earthquake. A finite fault source based on observed data is employed on a GPU-accelerated 3D strong ground motion simulation platform. The computational process considers the effects of 3D heterogeneous velocity structure and terrain. Subsequently, this data is incorporated into a mathematical model for earthquake disaster loss assessment derived from historical statistics, evaluating emergency response levels, fatalities, and economic losses. The inclusion of teleseismic data into this framework underscores its extensive applicability for rapid loss assessments, even in regions lacking local seismic data. Through comparisons with station observation waveforms and government-reported loss, the validity and practicality of the framework were substantiated. It plays a vital role in assisting emergency decisions, optimizing resource allocation, and further mitigating losses.

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The increase in hot–dry events with a high risk of mortality in China associated with the phase transition of the Atlantic Multidecadal Oscillation

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Atmospheric and Oceanic science Letters 2025年第4期18卷

作者： Ma, Yuting Shen, Xinyong Zhao, Liang Wang, Zijia Wang, Huibin Ding, Yihui Wang, Jingsong Liu, Yanju Huang, Cunrui State Key Laboratory of Climate System Prediction and Risk Management/Key Laboratory of Meteorological Disaster Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and Technology Nanjing China State Key Laboratory of Numerical Modeling for Atmosphere Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China College of Hydrology and Water Resources Hohai University Nanjing China The Second Affiliated Hospital Guangzhou Medical University Guangzhou China National Climate Center China Meteorological Administration Beijing China Key Laboratory of Space Weather National Satellite Meteorological Center (National Center for Space Weather) China Meteorological Administration Beijing China Innovation Center for FengYun Meteorological Satellite (FYSIC) Beijing China Vanke School of Public Health Tsinghua University Beijing China

Compound extreme climate events involving multiple meteorological elements usually have a more severe impact on the environment and human health than single-element extreme events. However, the current definition of multi-element compound extreme events is proposed from meteorological and statistical perspectives, without integrating health data, making the conclusions less practical for guiding health risk prevention. This study identified the threshold for hot–dry compound extreme events with high mortality risks (HMHDs) in China, using daily mortality data and temperature–humidity data from 278 districts or counties, and explored the interdecadal change and driving mechanisms of HMHD frequency in China from 1979 to 2021. The results show a significant increase in annual HMHD frequency in China after 2000, mainly occurring in summer (June, July, August). The northwestern to western regions of China (Xinjiang, Inner Mongolia, Gansu), and from the southwestern to the areas south of the Yangtze River (Sichuan, Hubei, Hunan, Jiangxi, Fujian, Guizhou, Yunnan), experience an increase of >10 days. The authors find that the interdecadal abrupt change in HMHD frequency can be attributed to the shift of the Atlantic Multidecadal Oscillation from a negative to a positive phase by affecting the Silk Road teleconnection. 摘要目前对复合极端事件的定义主要从气象和统计学角度出发, 未能结合健康数据, 使相关研究在指导健康风险预防方面的实用性较差. 本研究利用中国死亡数据和温湿度数据, 识别了中国高死亡风险的复合极端干热事件 (HMHDs) 的阈值, 并探讨了HMHD频率的年代际变化及其驱动机制. 结果显示, 中国西北地区, 西南地区和江南地区的HMHD频率平均每年都超过10 天. 2000年后, 中国HMHD频率显著增加, 主要发生在夏季. 驱动机制分析表明, HMHD频率的年代际变化可以归因于大西洋多年代际振荡由负相位转变为正相位. 本研究可为气候变化导致的健康风险防控提供参考依据. © 2025

关键词： Atlantic Multidecadal Oscillation Hot–dry compound events Relative humidity Temperature mortality

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Method for constructing multi-dimensional feature map of malicious code

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Journal of Physics: Conference Series 2021年第4期1748卷

作者： Haocong Ma Ji Zhang Junhua Zhou Xiang Zhai Junjie Xue Hang Ji State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System Engineering Beijing 100854 China Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing simulation Center Beijing 100854 China Science and Technology on Space System Simulation Laboratory Beijing Simulation Center Beijing 100854 China School of Computer Science and Technology Beijing Institute of Technology Beijing 100081 China

Malicious code is characterized by a large number of types, rapid increase in number, continuous update of transmission routes, and continuous enhancement of back analysis and back detection methods. Therefore, how to effectively detect and analyze malicious code has been a problem of great concern. This paper studies the features of binary file and disassembly file of malicious code, introduces the concept of information gain, and proposes a method to construct the multi-dimensional characteristic graph of malicious code. Finally, the convolutional neural network is used to classify the multi-dimensional feature graph of malicious code, which provides a new idea for the feature extraction of malicious code.

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