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Application and discussion of statistical seismology in probabilistic seismic hazard assessment studies

Science China Earth Sciences 2022年第2期65卷 257-268页

作者： Weilai PEI Shiyong ZHOU Jiancang ZHUANG ziyao xiong Jian PIAO School of Earth and Space Sciences Peking UniversityBeijing 100871China The Institute of Statistical Mathematics Research Organization of Information and SystemsTokyo 1908562Japan

Earthquakes are one of the natural disasters that pose a major threat to human lives and property. Earthquake prediction propels the construction and development of modern seismology;however, current deterministic earthquake prediction is limited by numerous difficulties. Identifying the temporal and spatial statistical characteristics of earthquake occurrences and constructing earthquake risk statistical prediction models have become significant;particularly for evaluating earthquake risks and addressing seismic planning requirements such as the design of cities and lifeline projects based on the obtained insight. Since the 21 st century, the occurrence of a series of strong earthquakes represented by the Wenchuan M8 earthquake in 2008 in certain low-risk prediction areas has caused seismologists to reflect on traditional seismic hazard assessment globally. This article briefly reviews the development of statistical seismology, emphatically analyzes the research results and existing problems of statistical seismology in seismic hazard assessment, and discusses the direction of its development. The analysis shows that the seismic hazard assessment based on modern earthquake catalogues in most regions should be effective. Particularly, the application of seismic hazard assessment based on ETAS(epidemic type aftershock sequence)should be the easiest and most effective method for the compilation of seismic hazard maps in large urban agglomeration areas and low seismic hazard areas with thick sedimentary zones.

关键词： Statistical seismology Earthquake prediction Probabilistic seismic hazard assessment Stress release model Epidemic type aftershock sequence model

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Inferring seismic hazard in Sichuan-Yunnan region of China based on the modern earthquake catalogue (1980-2019)

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Earthquake Science 2020年第3期33卷 107-115页

作者： ziyao xiong Shiyong Zhou Jiancang Zhuang School of Earth and Space Sciences Peking UniversityBeijing100871China The Institute of Statistical Mathematics Tokyo 1908562Japan

Based on the modern earthquake catalogue,the incomplete centroidal voronoi tessellation(ICVT)method was used in this study to estimate the seismic hazard in Sichuan-Yunnan region of *** calculated spatial distributions of the total seismic hazard and background seismic hazard in this *** Bayesian delaunay tessellation smoothing method put forward by Ogata was used to calculate the spatial distributions of *** results show that seismic hazards in Sichuan-Yunan region are high,and areas with relatively high hazard values are distributed along the main faults,while seismic hazards in Sichuan basin are relatively low.

关键词： seismic hazard analysis Voronoi tessellation spatial smoothing b-value

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Using Walkaway VSP technology to improve inversion resolution

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Earthquake Research Advances 2021年第S1期1卷 76-79页

作者： Xingda Tian Handong Huang Yang Liu Tingen Fan ziyao xiong State key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-BeijingBeijing 102249China CNOOC Research Institute BeijingChina School of Earth and Space Sciences Peking UniversityBeijingChina

Walkaway VSP technology is commonly seen in the seismic development stage in the middle and late stages of the *** advantage over conventional zero-offset VSP and non-zero well-source distance VSP is mainly due to the higher coverage of the Walkaway VSP acquisition process and the larger acquisition *** resolution and signal-to-noise ratio are *** VSP technology has a very good application effect on solving complex structural problems and thin interbed reservoir *** paper mainly introduces a VSP constrained sparse spike inversion method based on high-precision VSP *** the data acquired by the eight-azimuth Walkaway VSP in a work area of Bohai Gulf,a new method of 3D seismic-VSP joint seismic inversion is *** the application of the actual work area,good inversion results based on Walkaway VSP data were obtained,and a new R24 small layer above the top boundary of the NmRIll oil group was *** result meets the needs of development seismic technology and is used to solve thin interbed reservoirs exploration problems that have very important practical significance.

关键词： walkaway VSP thin reservoir constrained sparse spike inversion high resolution

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Effect of tidal stress on fault nucleation and failure of the 2007 Ms6.4 Ning＇er earthquake

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Science China Earth Sciences 2016年第9期59卷 397-407页

作者： XIE ChaoDi LEI XingLin WU XiaoPing FU Hong xiong ziyao HU xiongLin LI Sha Geophysics Department School of Resources & Earth Science Yunnan University Kunming 650091 China Geological Survey of Japan AIST Tsukuba 305-8567 Japan Earthquake Administration of Yunnan Province Kunming 650224 China

Based on calculations of the tidal Coulomb failure stress and investigations of the correlation between the Earth tide and the Ning＇er earthquake sequence, the processes of fault nucleation and failure were simulated. In these simulations we consider the influence of tidal stresses using the rate- and state-dependent friction laws. Furthermore, the effects on tidal trig- gering due to the stress amplitude and periodic oscillation properties were investigated, and the triggering effects between the tidal normal and tidal shear stresses were compared. The results showed that the Ning＇er earthquake sequence was a physical consequence of tidal effects. A transition period To exists between the nucleation and failure processes of a seismic fault. When the period T of stress is equal to or becomes larger than To, the fault response becomes dependent on the periodic features of the loading stress; however, for T 〈 To, the response of the fault is nearly independent of the period. Both the tidal normal and tidal shear stresses have similar effect in the nucleation and failure processes; the clock changes generally increase with the maximum amplitudes of the tidal stresses. Tidal normal and tidal shear stresses with positive amplitudes mainly induce earth- quake triggering; however, the triggering effects induced by negative tidal stresses are smaller and faults are not sensitive to negative tidal stresses. Our results primarily reveal the physical mechanisms of tidal stress triggering.

关键词： Tidal Coulomb failure stress Ning'er earthquake Rate- and state-dependent friction law Tidal period

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中国海洋研究型人才流动网络及动态变化——基于知网数据分析

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热带地理 2024年第9期44卷 1686-1701页

作者：郭建科高京燕熊子尧教育部人文社科重点研究基地“辽宁师范大学海洋可持续发展研究院” 大连116029

人才是区域发展的核心要素,人才的开发和培育是衡量一个区域创新能力的重要维度,对人才的吸引力更是一个区域发展活力的最好体现。为此,文章以知网涉海类核心期刊作者在2000—2020年发表的文献为基础数据,对海洋研究型人才的动态变化进... 详细信息

人才是区域发展的核心要素,人才的开发和培育是衡量一个区域创新能力的重要维度,对人才的吸引力更是一个区域发展活力的最好体现。为此,文章以知网涉海类核心期刊作者在2000—2020年发表的文献为基础数据,对海洋研究型人才的动态变化进行分析。结果表明:1)20年间,海洋研究型人才流动呈现先增后减的变化态势,网络表现出典型的“金字塔结构”特征,网络被少数枢纽型节点城市控制。2)海洋研究型人才流动的空间分布格局相对稳定,形成以青岛为核心,大连、北京、上海、广州为顶点的菱形结构,海洋研究型人才迁移分为城市内的闭环迁移和异地迁移2种模式,闭环迁移占比逐年增加,市内迁移现象凸显。3)海洋研究型人才流动表现出明显的空间非均衡性,迁入人次的空间分布逐渐均衡化,迁出人次则趋向集中分布。华东、华南地区是海洋研究型人才净流入活跃区,东北、华中地区以及北京等地是海洋研究型人才净迁出活跃区,且这些区域的高强度净流入现象和净流出问题在逐渐缓解。4)海洋研究型人才流动网络具有明显的“核心-边缘”结构,“马太效应”显著,青岛一直处于网络的核心,半边缘城市与核心城市保持较强的人才往来,彼此之间也存在较强的关系流,边缘城市的海洋研究型人才主要流向核心城市、半边缘城市。

关键词：海洋研究型人才人才流动空间分布网络结构中国

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基于航运网络的港口海向可达性识别与测度

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地理研究 2024年第4期43卷 824-842页

作者：吴莎莎梁木新郭建科熊子尧教育部人文社会科学重点研究基地“辽宁师范大学海洋可持续发展研究院” 大连116029 辽宁师范大学地理科学学院大连116029 广东省科学院广州地理研究所广州510070 辽宁省“海洋经济高质量发展”高校协同创新中心大连116029

港口基础设施的高效可达是国际运输成本的决定因素与区域互联互通和相互作用的前提。因此,如何测定港口海向可达性并从中揭示港口间交互作用的模式是研究航运网络的一个难点和热点。本文以中国与“海上丝路”沿线主要港口航运网络为研... 详细信息

港口基础设施的高效可达是国际运输成本的决定因素与区域互联互通和相互作用的前提。因此,如何测定港口海向可达性并从中揭示港口间交互作用的模式是研究航运网络的一个难点和热点。本文以中国与“海上丝路”沿线主要港口航运网络为研究对象,在考虑班轮服务频率及地理因素的影响下,基于陆路可达性理论提出融入加权路径的港口海向可达性模型,并改进复杂网络中心性指标,针对不同年份的样本统一处理,使相关指标更具可比性,验证其有效性和适用性。结果表明:(1)整体看,班轮服务频率能更深层次揭示各指标所反映港口的实际功能差异;从核密度分析看,航运网络的航线运行效率(WCC)、港口调控能力(WBC)均存在较明显的绝对差异和分化程度。(2)通过复合中心性(WC)的统计特征表明,港口单个优势功能在体现港口的影响力时存在偏差,结合WC能够有针对性地提出港口嵌入“航运网络”中亟待优化的功能。(3)以加权平均路径为模型测度的港口海向可达性呈现微弱的离散化,“马太效应”也更为明显。仅少数港口的可达性提升明显,但可达性较低的港口仍将长期存在,且绝对差异增大。

关键词：航运网络中心性港口海向可达性海上丝路

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Three-dimensional fracture of UO2 ceramic pellets by phase field modeling

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 169-180页

作者： Wei xiong Xuan Ye Hongzhang Cheng Xiaoming Liu Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences School of Engineering Science University of Chinese Academy of Sciences

Fracture is the primary failure type for the UO2ceramic pellets,which are operated under irradiation and thermal processes,and physically confined by the *** this work,by combining closely coupled physical processes of heat conduction,heat transfer,and mechanical deformation with the cohesive phase field framework,we proposed a high-precision modeling of quasistatic cracking of three-dimensional （3D） UO2ceramic fuel pellets under high temperature and *** simulation results agree well with the experimental results,indicating that the proposed method has the potential to capture 3D crack modes in the interested time ***,we studied the relation of the 3D fracture patterns of fuel pellets with the peak power *** was found that the power level plays a critical role in determining the competition between radial and circumferential cracks,as well as transverse penetrating cracks.

关键词： phase field method nuclear fuel pellet coupled thermo-mechanical model thermal fracture

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Adaptive-basis decomposition-based low-rank network for efficient non-uniform motion deblurring

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Optoelectronics Letters 2025年第1期21卷 43-50页

作者： CHEN Lei xiong Qingbo ZHANG Wei LI Runde School of Software Henan University School of Applied Technology China University of Labor Relations

In this study, we present a unified sparsity-driven framework that significantly enhances motion deblurring performance by integrating two key components: a custom-designed dataset and a low-rank module(LRM). This framework leverages the inherent sparsity of per-pixel blur kernels to bolster both deblurring accuracy and model interpretability. Firstly, we propose an adaptive-basis decomposition-based deblurring(ADD) approach, which constructs a tailored training dataset to enhance the generalization capacity of the deblurring network. The ADD framework adaptively decomposes motion blur into sparse basis elements, effectively addressing the intricacies associated with non-uniform blurs. Secondly, an LRM is proposed to improve the interpretability of deblurring models as a plug-and-play module, primarily designed to identify and harness the intrinsic sparse features in sharp images. A series of ablation studies have been conducted to substantiate the synergistic advantages of combining the proposed ADD with the LRM for overall improvement in deblurring efficacy. Subsequently, we empirically demonstrate through rigorous experimentation that incorporating the LRM into an existing Uformer network leads to substantial enhancement in reconstruction performance. This integration yields a sparsity-guided low-rank network(SGLRN). Operating under the overarching principle of sparsity, SGLRN consistently outperforms state-of-the-art methods across multiple standard deblurring benchmarks. Comprehensive experimental results, assessed through quantitative metrics and qualitative visual evaluations, provide compelling evidence of its effectiveness. The overall deblurring results are available at Google Drive.

关键词： Image enhancement

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AZD1775 synergizes with SLC7A11 inhibition to promote ferroptosis

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Science China Life Sciences 2025年第1期68卷 204-218页

作者： Chen xiong Hong Ling Yingdan Huang Hanzhi Dong Bangxiang Xie Qian Hao Xiang Zhou Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences Fudan University Department of Oncology Shanghai Medical CollegeFudan University Department of Breast Surgery Fudan University Shanghai Cancer CenterFudan University Department of Oncology First Affiliated Hospital of Nanchang University Beijing Institute of Hepatology Beijing Youan HospitalCapital Medical University Beijing Engineering Research Center for Precision Medicine and Transformation of Hepatitis and Liver Cancer Key Laboratory of Breast Cancer in Shanghai Fudan University Shanghai Cancer CenterFudan University Shanghai Key Laboratory of Medical Epigenetics International Co-laboratory of Medical Epigenetics and Metabolism (Ministry of Science and Technology)Institutes of Biomedical SciencesFudan University

Tumor suppressor p53-mediated cell cycle arrest and DNA damage repair may exert cytoprotective effects against cancer therapies, including WEE1 inhibition. Considering that p53 activation can also lead to multiple types of cell death, the role of this tumor suppressor in WEE1 inhibitor-based therapies remains disputed. In this study, we reported that nucleolar stress-mediated p53 activation enhanced the WEE1 inhibitor AZD1775-induced ferroptosis to suppress lung cancer growth. Our findings showed that AZD1775 promoted ferroptosis by blocking cystine uptake, an action similar to that of Erastin. Meanwhile, inhibition of WEE1 by the WEE1 inhibitors or si RNAs induced compensatory upregulation of SLC7A11, which conferred resistance to ferroptosis. Mechanistically, AZD1775 prevented the enrichment of H3K9me3, a histone marker of transcriptional repression, on the SLC7A11 promoter by repressing the expression of the histone methyltransferase SETDB1, thereby enhancing NRF2-mediated SLC7A11 transcription. This finding was also validated using the H3K9me3 inhibitor BRD4770. Remarkably, we found that the nucleolar stress-inducing agent Actinomycin D(Act. D) inhibited SLC7A11 expression by activating p53, thus augmenting AZD1775-induced ferroptosis. Moreover, the combination of AZD1775 and Act. D synergistically suppressed wild-type p53-harboring lung cancer cell growth both in vitro and in vivo. Altogether, our study demonstrates that AZD1775 promotes ferroptosis by targeting cystine uptake but also mediates the adaptive activation of SLC7A11 through the WEE1-SETDB1 cascade and NRF2-induced transcription, and inhibition of SLC7A11 by Act. D boosts the anti-tumor efficacy of AZD1775 by enhancing ferroptosis in cancers with wild-type p53.

关键词： p53 NRF2 SLC7A11 WEE1 AZD1775 ferroptosis nucleolar stress

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The emerging role of nitric oxide in the synaptic dysfunction of vascular dementia

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Neural Regeneration Research 2025年第2期20卷 402-415页

作者： Xiaorong Zhang Zhiying Chen Yinyi xiong Qin Zhou Ling-Qiang Zhu Dan Liu Department of Pathology Affiliated Hospital of Jiujiang UniversityJiujiangJiangxi ProvinceChina Jiujiang Clinical Precision Medicine Research Center JiujiangJiangxi ProvinceChina Center for Cognitive Science and Transdisciplinary Studies Jiujiang UniversityJiangxi ProvinceChina Department of Neurology Affiliated Hospital of Jiujiang UniversityJiujiangJiangxi ProvinceChina Department of Rehabilitation Affiliated Hospital of Jiujiang UniversityJiujiangJiangxi ProvinceChina Department of Pathophysiology School of Basic MedicineTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina

With an increase in global aging,the number of people affected by cerebrovascular diseases is also increasing,and the incidence of vascular dementia-closely related to cerebrovascular risk-is increasing at an epidemic ***,few therapeutic options exist that can markedly improve the cognitive impairment and prognosis of vascular dementia *** in Alzheimer’s disease and other neurological disorders,synaptic dysfunction is recognized as the main reason for cognitive *** oxide is one of the ubiquitous gaseous cellular messengers involved in multiple physiological and pathological processes of the central nervous ***,nitric oxide has been implicated in regulating synaptic plasticity and plays an important role in the pathogenesis of vascular *** review introduces in detail the emerging role of nitric oxide in physiological and pathological states of vascular dementia and summarizes the diverse effects of nitric oxide on different aspects of synaptic dysfunction,neuroinflammation,oxidative stress,and blood-brain barrier dysfunction that underlie the progress of vascular ***,we propose that targeting the nitric oxide-sGC-cGMP pathway using certain specific approaches may provide a novel therapeutic strategy for vascular dementia.

关键词： endoplasmic reticulum stress endothelial nitric oxide synthase gene therapy nitric oxide NO-sGC-cGMP pathway synaptic dysfunction vascular dementia

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