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新疆地区6级以上地震前Benioff应变比特征研究

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地震研究 2025年第2期48卷 264-271页

作者：杨文余怀忠张小涛中国地震台网中心北京100045

强震发生前,震中附近地区普遍存在应变能加速释放现象,预示孕震区接近或进入临界状态。以Benioff应变作为响应量,计算不同时段的Benioff应变比,可作为表征应变能释放快慢的参数,其异常演化反映了地震成核过程中介质的高应力状态。利用... 详细信息

强震发生前,震中附近地区普遍存在应变能加速释放现象,预示孕震区接近或进入临界状态。以Benioff应变作为响应量,计算不同时段的Benioff应变比,可作为表征应变能释放快慢的参数,其异常演化反映了地震成核过程中介质的高应力状态。利用中国地震台网地震目录,首先对新疆地区最小完备性震级进行分析。在此基础上,计算2000—2023年新疆地区6级以上地震前1年内每月前后90天的Benioff应变比,并以2016年阿克陶6.7级地震和呼图壁6.2级地震为例,对两次地震前的Benioff应变比时空演化特征进行分析。结果显示:18组6级地震中有14组地震在震前1年内在震中附近出现高值异常,通过预测效果检验,表明Benioff应变比高值异常对新疆地区6级地震具有一定中短期预测意义。在2016年阿克陶6.7级地震和呼图壁6.2级地震前1年内孕震区应变比均表现为“逐渐升高—快速降低—稳定波动”的特征,可能与断层失稳成核过程有关。

关键词： Benioff应变比新疆地区最小完备性震级地震预测

多方法组合预测模型在CSEP计划中的应用和预测效能检验

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地震研究 2025年第2期48卷 199-209页

作者：于晨韩盈张永仙张小涛余怀忠中国地震台网中心北京100045 中国地震局地震预测研究所北京100036

为了更好地评估CSEP中国检验中心的实用性,对基于多方法组合预测模型MMEP的2018—2023年全国5级以上地震的年度预测结果进行了系统梳理,并采用CSEP中国检验中心的R值评分模块对年度预测结果进行了评估。结果表明:(1)近几年MMEP年度预测... 详细信息

为了更好地评估CSEP中国检验中心的实用性,对基于多方法组合预测模型MMEP的2018—2023年全国5级以上地震的年度预测结果进行了系统梳理,并采用CSEP中国检验中心的R值评分模块对年度预测结果进行了评估。结果表明:(1)近几年MMEP年度预测结果的R值评分均值在0.3~0.4,年度预测效能波动较小;(2)中国大陆西部地区的预测结果优于东部地区,其中2019年四川长宁6.0级、2020年新疆伽师6.4级和于田6.4级地震的年度预测以及四川泸定6.8级地震的中短期预测的“时、空、强”三要素基本正确。

关键词：多方法组合预测模型 CSEP计划加卸载响应比 R值评分方法预测效能检验

“一带一路”倡议与WTO跨文化争端网络演进——基于社会计算科学的视角

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管理评论 2025年第1期37卷 28-39页

作者：霍达肖皓张晓涛易靖韬李君航中央财经大学国际经济与贸易学院北京100081 湖南大学经济与贸易学院长沙410012 中国人民大学商学院北京100872

随着全球经济的不断发展,跨文化经贸合作成为各国参与和制定国际规则的重要方式。“一带一路”倡议在跨文化经贸合作中产生的协同效应日益显著。在我国提出“一带一路”倡议10周年与加入世界贸易组织20周年的“双十周年”叠加之际,本文... 详细信息

随着全球经济的不断发展,跨文化经贸合作成为各国参与和制定国际规则的重要方式。“一带一路”倡议在跨文化经贸合作中产生的协同效应日益显著。在我国提出“一带一路”倡议10周年与加入世界贸易组织20周年的“双十周年”叠加之际,本文从社会计算科学的视角,结合跨文化经贸合作探讨了“一带一路”倡议对WTO争端网络演进的作用机制。研究结合古诺均衡与斯塔伯格均衡分析了动态博弈机制下跨文化经贸谈判耐心优势对制度进入壁垒的影响,并结合马尔科夫链蒙泰卡罗模型预测分析了“一带一路”倡议对WTO跨文化争端网络的演进机制,同时结合多主体模型对多边跨文化经贸合作机制进行了模拟仿真。研究发现,“一带一路”倡议通过包容多元文化差异,推动WTO争端网络从单极主导的克拉克哈特风筝形态向更加对称的蝴蝶型分布演进。研究为“一带一路”倡议充分发挥制度公共产品优势积极推动开放包容的WTO跨文化经贸合作体系建设提供了重要参考。

关键词： “一带一路”倡议 WTO争端网络跨文化经贸合作社会计算科学

Dual-function surfactant strategy for two-dimensional organic semiconductor crystals towards high-performance organic field-effect transistors

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Science China Chemistry 2021年第6期64卷 1057-1062页

作者： Zheng Chen Shuming Duan xiaotao zhang Wenping Hu Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin University&Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin 300072China Joint School of National University of Singapore and Tianjin University Fuzhou International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China Institute of Molecular Aggregation Sciences Tianjin UniversityTianjin 300072China

Two-dimensional(2D)organic semiconductor crystals(OSCs)are ideal platforms for investigating fundament materials as well as achieving high-performance organic field-effect transistors(OFETs).The surfactants played an important role in the 2DOSCs growth in previous ***,residual surfactants may cause performance degradation of ***,a simple and effective dual-function surfactant strategy is used to control the growth of large-area few-molecular-layer *** introduction of phosphatidylcholine decreases the interfacial tension and improves the crystal growth dynamics,resulting in high-quality and large-area few-molecular-layer 2,6-bis(4-hexylphenyl)anthracene(C_6–DPA)*** additive also passivates charge traps,boosting the mobility of 2DOSC-based OFETs by almost *** method is also suitable for the growth of various high-quality 2DOSCs,opening up a new avenue for high-quality 2DOSCs towards high-performance OFETs.

关键词： two-dimensional crystals organic semiconductors organic field-effect transistors

Digital cancellation of multi-band passive inter-modulation based on Wiener-Hammerstein model

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Digital Communications and Networks 2024年第4期10卷 1189-1197页

作者： Jinxiang Liu xiaotao zhang Jun Yang Huiping Yang School of Electronic and Information Engineering South China University of TechnologyGuangzhou 510641China Huawei Technologies Co. Ltd.Dongguan 523808China School of Electronic and Information Engineering South China Normal UniversityGuangzhou 510631China

Utilizing multi-band and multi-carrier techniques enhances throughput and capacity in Long-Term Evolution(LTE)-Advanced and 5G New Radio(NR)mobile ***,these techniques introduce Passive Inter-Modulation(PIM)interference in Frequency-Division Duplexing(FDD)*** this paper,a novel multi-band Wiener-Hammerstein model is presented to digitally reconstruct PIM interference signals,thereby achieving effective PIM Cancellation(PIMC)in multi-band *** the model,transmitted signals are independently processed to simulate Inter-Modulation Distortions(IMDs)and Cross-Modulation Distortions(CMDs).Furthermore,the Finite Impulse Response(FIR)filter,basis function generation,and B-spline function are applied for precise PIM product estimation and generation in multi-band *** involving 4 carrier components from diverse NR frequency bands at varying transmitting powers validate the feasibility of the model for multi-band PIMC,achieving up to 19 dB in PIMC *** to other models,this approach offers superior PIMC performance,exceeding them by more than 5 dB in high transmitting power ***,its lower sampling rate requirement reduces the hardware complexity associated with implementing multi-band PIMC.

关键词： Passive inter-modulation Frequency-division duplexing Nonlinear distortion Digital cancellation Spline interpolation Wiener-Hammerstein model

Research progress of rubrene as an excellent multifunctional organic semiconductor

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Frontiers of physics 2021年第1期16卷 57-71页

作者： Si Liu Hongnan Wu xiaotao zhang Wenping Hu Tianjin Key Laboratory of Molecular Optoelectronic Science Department of ChemistrySchool of ScienceTianjin University&Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin 300072China

Rubrene,a superstar in organic semiconductors,has acliieved imprecedented achievements in the application of electronic devices,and research based on its various photoelectric properties is still in *** this review,we introduced the preparation of rubrene crystal,summarized the applications in organic optoelectronic devices with the latest research achievements based on rubrene *** outlook of future research directions and cliallenges of rubrene semiconductor for applications is also provided.

关键词： rubrene organic semiconductor optoelectronic devices

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中国CSEP检验中心的软件系统建设

地震研究 2025年第2期48卷 177-187页

作者：余怀忠于晨张小涛苑争一钟骏解孟雨李泽平张靖雪中国地震台网中心北京100045

为提升地震预测方法评价的标准化和应用的规范化,依托国家重点研发计划尝试把CSEP(Collaboratory for the Study of Earthquake Predictability)移植到中国,建立中国CSEP检验中心。自主研发了加卸载响应比(LURR)、地壳振动、态矢量和地... 详细信息

为提升地震预测方法评价的标准化和应用的规范化,依托国家重点研发计划尝试把CSEP(Collaboratory for the Study of Earthquake Predictability)移植到中国,建立中国CSEP检验中心。自主研发了加卸载响应比(LURR)、地壳振动、态矢量和地震综合概率预测模块;引进了国外的图像信息(PI)、相对强度(RI)、传染型余震序列(ETAS)预测模型并完成模块研发;遴选出Molchan检验、R值评分、N值检验和ROC检验等国际认可的地震预报效能评价方法,以集成方式搭建运行平台。作为开放性检验中心,通过不断纳入新的算法,着力提升地震预测能力、推进地震预测实践,将地震预报业务中常用的地震发生率指数、小震调制比、b值等预测方法纳入到中心运行。中心的软件系统既能够完成回顾性预测检验,又能够实现前瞻性预测分析,可为现有预测方法提供运行环境和技术支持。

关键词： CSEP检验中心预测模块检验模块集成功能开放性

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A Genuinely Two-Dimensional HLL-Type Approximate Riemann Solver for Hypo-Elastic Plastic Flow

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Communications in Computational Physics 2023年第7期34卷 318-356页

作者： Zhiqiang Zeng Chengliang Feng xiaotao zhang Shengtao zhang Tiegang Liu LMIB and School of Mathematical Sciences Beihang UniversityBeijing100191China Haifang(Shanghai)Technology Co. Ltd.Shanghai200000China

In this work,a genuinely two-dimensional HLL-type approximate Riemann solver is proposed for hypo-elastic plastic *** consider the effects of wave interaction from both the x-and y-directions,a corresponding 2D elastic-plastic approximate solver is constructed with elastic-plastic transition *** resultant numerical flux combines one-dimensional numerical flux in the central region of the cell edge and two-dimensional flux in the cell vertex *** stress is updated separately by using the velocity obtained with the above approximate Riemann *** numerical tests,including genuinely two-dimensional examples,are presented to test the performances of the proposed *** numerical results demonstrate the credibility of the present 2D approximate Riemann solver.

关键词： Elastic plastic flow elastic-plastic transition multi-dimensional effect twodimensional approximate Riemann solver

Study on the Hydration and Physical Properties of Cement by M18 Polycarboxylate Superplasticizer Modified Graphene Oxide

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Journal of Renewable Materials 2023年第2期11卷 625-641页

作者： Dalong Liao Dongxu Li Shun Zhou xiaotao zhang Ying Fang College of Materials Science and Engineering Nanjing Tech UniversityNanjing211816China

Graphene oxide(GO)as a new nano-enhancer in cement-based materials has gained wide ***,GO is easy to aggregate in alkaline cement mortar with poor *** hinders its application in practical infrastructure *** this work,GO-M18 polycarboxylate compound superplasticizer(GM)were obtained by compounding the M18 polycarboxylate superplasticizer with GO solution at different mass *** dispersion of GM in alkaline solution was systematically *** phases and functional groups of GM were characterized by XRD and *** effects of GM on the cement mortar hydration and the formation of microstructure were investigated by measuring the heat of hydration,MIP,TG/DSC,and *** results show that the long-chain structure of the M18 polycarboxylate superplasticizer can increase the interlayer spacing of GO and weaken the force between GO *** modified GO can be uniformly dispersed in the cement *** can accelerate the early hydration process of cement,which can increase the content of Ca(OH)2 and decrease the grain *** can optimize the pore size distribution of cement-based materials,increase the density of harmless and less harmful pores,thereby improving mechanical *** methods can transform traditional cement-based materials into stronger,more durable composites,which prolong the life of cement-based materials and reduce the amount of cement used for later *** provides an idea for achieving sustainability goals in civil engineering.

关键词： Modified graphene oxide cement polycarboxylate superplasticizer hydration properties me-chanical performance