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Journal of Earth Science 2015年第3期26卷 384-390页

作者： Chengli Liu Yong Zheng xiong xiong State Key Laboratory of Geodesy and Earth's Dynamic Institute of Geodesy and Geophysics Chinese Academy of Sciences

The point source parameters of the April 12, 2012 Mw 7.0 Santa Isabel, Mexico, earthquake indicated by teleseismic P and SH waveforms obtained by a means of traditional cut and paste（CAP） method show that the best double-couple solution of this event is： 37°/127°, 90°/81° and-9°/-180° for strike, dip and rake, respectively. Its centroid depth is 13 km. Global teleseismic waveform data exhibit that the rupture of the earthquake initiated at a focal depth of 13 km and propagated southeastward with a relatively slow rupture velocity（about 1.8 km/s on average）. The maximum slip occurred at 30 km southeast of the hypocenter, with the peak slip of 3.57 m and total seismic moment of whole fault up to 3.98×1019 N·m. These observations provide some insight into properties, co- or post-seismic deformation and coulomb stress changes of future earthquake in this area.

关键词： Mexico Earthquake rupture velocity focal mechanism slip history

面向公共建筑空间环境认知的AR技术应用研究

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城市建筑 2024年第11期21卷 11-14页

作者：李加悦刘宙熊熊陈晓婷上海市城市建设设计研究总院(集团)有限公司上海地铁第一运营有限公司

随着智能移动终端技术、物联网技术日新月异地发展,增强现实(AR)技术逐步走进了大众的日常生活。AR技术将虚拟信息与现实场景融合,创造了丰富的感官体验。人们对公共建筑空间环境的认知具有空间动态性与连续性、主体差异性、信息复杂性... 详细信息

随着智能移动终端技术、物联网技术日新月异地发展,增强现实(AR)技术逐步走进了大众的日常生活。AR技术将虚拟信息与现实场景融合,创造了丰富的感官体验。人们对公共建筑空间环境的认知具有空间动态性与连续性、主体差异性、信息复杂性、空间与行为的互动性等特征,这些特性导致了个体对公共空间环境认知的局限性。AR技术应用于人们对公共建筑的使用过程,将帮助使用者突破有限的空间认知,获取更加直观且丰富的多维度信息。文章首先提出公共建筑空间环境认知的局限,进而提出AR技术在增强空间环境认知方面所起到的作用,最后通过一个实际项目,介绍了AR技术在空间认知提升方面的技术实践,论证了AR技术在公共建筑空间环境认知提升方面所起到的积极作用。

关键词：增强现实(AR) 物联网(IOT) 空间环境认知技术应用

Credit Rationing and the Simulation of Bank-Small and Medium Sized Firm Artificial Credit Market

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Journal of Systems Science & Complexity 2016年第4期29卷 991-1017页

作者： LIU Xuefeng ZHANG Wei xiong xiong SHEN Dehua ZHANG Yongjie College of Management and Economics Tianjin UniversityTianjin 300072China Key Laboratory of Computation and Analytics of Complex Management Systems(CA CMS) Tianjin UniversityTianjin 300072China Departament d'Economia Universitat Jaume ICastellSn de la Plana12071Spain.

By analyzing the financing difficulties faced by the small and medium-sized firms, the paper built an artificial credit markets with the agent-based computational modeling to simulate the real world credit transactions. There are firms, banks, different risk-type projects as well as legal and supervision environments in which debt contracts constitute the financial instruments. The simulation results show that the number of collateral, average success probability of projects, and the prime interest rate have materially impact on bank's average profit, bank's capital, the overall interest rate,the number of borrowing firms, loan size, and the degree of credit rationing. These results in line with those of the classical S-W model in the sense that the relationship between bank profits and interest rates is non-monotonic as well as the relationship between credit rationing and interest rates. And thus there is an adverse selection effect in credit rationing theory.

关键词： Agent-based computational finance artificial credit market credit rationing small- and medium-sized firms.

Rupture Process of the M_s 7.0 Lushan Earthquake Determined by Joint Inversion of Local Static GPS Records, Strong Motion Data, and Teleseismograms

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Journal of Earth Science 2017年第2期28卷 404-410页

作者： Jun Li Chengli Liu Yong Zheng xiong xiong State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and Geophysics CAS Hubei Subsurface Multi-Scale Imaging Key Laboratory Institute of Geophysics and Geomatics China University of Geosciences

On April 20, 2013, an M_s 7.0 earthquake struck Lushan County in Sichuan Province, China, and caused serious damage to the source region. We investigated the rupture process of the M_s7.0 Lushan earthquake by jointly inverting waveforms of teleseismic P waveforms and local strong motion records as well as static GPS observations. The inverted results indicate that the rupture of this earthquake was dominated by the failure of an asperity with a triangular shape and that the main shock was dominated by thrust slip. The earthquake released a total seismic moment of 1.01× 10^（19）Nm, with 92% of it being released during the first 11 s. The rupture had an average slip of 0.9 m and produced an average stress drop of 1.8 MPa. Compared with our previous work that was based mainly on a unique dataset, this joint inversion result is more consistent with field observations and the distribution of aftershock zones.

关键词： GPS Longmenshan Lushan earthquake rupture process strong motion

Static slip model of the M_w 9.0 Tohoku (Japan) earthquake:Results from joint inversion of terrestrial GPS data and seafloor GPS/acoustic data

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Chinese Science Bulletin 2012年第16期57卷 1990-1997页

作者： DIAO FaQi xiong xiong ZHENG Yong State Key Laboratory of Geodesy and Earth's Dyanmics Institute of Geodesy and GeophysicsChinese Academy of SciencesWuhan 430077China

Based on co-seismic displacements recorded by terrestrial GPS stations and seafloor GPS/acoustic stations, the static slip model of the 2011 Mw 9.0 Tohoku earthquake was determined by inverting the data using a layered earth model. According to a priori information, the rupture surface was modeled with a geometry that is close to the actual rupture, in which the fault dip angle increases with depth and the fault strike varies with the trend of the trench. As shown by the results inferred from the joint inversion, the "geodetic" moment is 3.68 × 10 22 Nm, corresponding to Mw 9.01, and the maximum slip is positioned at a depth of 13.5 km with a slip magnitude of 45.8 m. Rupture asperities with slip exceeding 10 m are mainly distributed from 39.6 to 36.97°N, over a length of almost 240 km along the trench. The slip was mostly concentrated at depths shallower than 40 km, up-dip of the hypocenter. "Checkerboard" tests reveal that a joint inversion of multiple datasets can resolve the slip distribution better than an inversion with terrestrial GPS data only-especially when aiming to resolve slip at shallow depths. Thus, the joint inversion results obtained by this work may provide a more reliable slip model than the results of other studies that are only derived from terrestrial GPS data or seismic waveform data.

关键词： GPS数据联合反演滑移模型地震位移地面海底静态东北

Enhanced Adhesion of Mussel-inspired Adhesive through Manipulating Contents of Dopamine Methacrylamide and Molecular Weight of Polymer

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Journal of Bionic Engineering 2018年第3期15卷 461-470页

作者： xiong xiong Yumei Liu Feng Shi Guowei Zhang Jie Weng Shuxin Qu Key Lab of Advanced Technologies of Materials Ministry of Education School of Materials Science and Engineering Southwest Jiaotong University Chengdu 610031 China School of Life Science and Engineering Southwest Jiaotong University Chengdu 610031 China College of Environmental Science and Engineering China West Normal University Nanchong 637009 China Collaboration Innovation Center for Tissue Repair Material Engineering Technology China West Normal University Nanehong 637009 China

The aim of this study is to investigate the effect of the contents of modified 3, 4-dihydroxyphenyl-L-alanine （DOPA）, named as do- pamine methacrylamide （DMA）, on the adhesion of mussel-inspired adhesives in air and water. A series of adhesives, p（DMA-co-MEA）, were synthesized by copolymerized DMA and methoxy ethylacrylate （MEA） with the content of DMA from 2 mol.% to 10 mol.%. Results of IH NMR show that the contents of DMA in all adhesives are near to the theory ratios of DMA in the staring reagents. Adhesives with more than 5 mol.% of DMA appear adhesion, while adhesives with 2 mol. % and 3 mol. % of DMA show almost no adhesion in air and water. Adhesive with 7 mol.% of DMA has the highest molecular weight and adhesion either in air or in water in all adhesives. Adhesion of adhesive is synergistically influenced by the content of DMA, molecular weight and elastic modulus of adhesive. It is because that higher content of DMA would provide more DOPA, which leads to the coordination bond between DOPA and metal ions. It is feasible to develop the mussel-inspired adhesive through incorporating DMA into polymers, which will have potential application in the clinic.

关键词： mussel-inspired adhesive adhesion dopamine methacrylamide

Observations and modeling of flat subduction and its geological effects

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Science China Earth Sciences 2020年第8期63卷 1069-1091页

作者： Zhiyong YAN Lin CHEN xiong xiong Kai WANG Renxian XIE Hou Tze HSU MOE Key Laboratory of Fundamental Physical Quantities Measurement&Hubei Key Laboratory of Gravitation and Quantum Physics PGMF and School of PhysicsHuazhong University of Science and TechnologyWuhan 430074China Institute of Geophysics and PGMF Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Geodesy and Earth s Dynamic Institute of Geodesy and GeophysicsChinese Academy of SciencesWuhan 430077China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Institute of Geophysics and Geomatics China University of GeosciencesWuhan 430074China

Flat subduction refers to low-angle(<10°) or sub-horizontal subduction of oceanic slabs. Flat subduction is only recognized in ~10% of present-day subduction zones, but its impact on the behavior of the overriding plate is particularly *** example, flat subduction zones are typically associated with stronger earthquakes. The deformation caused by typical flat subduction will transfer from the trench to the overriding continental interior and form a broad magma belt. The formation mechanism of flat subduction has been linked to the relative buoyancy of subducted oceanic plateaus, overthrusting of the overriding plate, hydrodynamic suction, and trench retreat. However, these mechanisms remain debated. This paper systematically analyzes and summarizes previous studies on flat subduction, and outlines the possible geological effects of flat subduction, such as intracontinental orogeny and magmatism. Using examples from numerical modeling, we discuss the possible formation mechanisms. The most important factors that control the formation of flat subduction are associated with overthrusting of the overriding plate and the arrival of an oceanic plateau at the subduction zone. In addition, trench retreat is necessary to enable flat subduction. Hydrodynamic suction contributes to the reduction of the slab dip angle, but is insufficient to form flat subduction. Future numerical modeling of flat subduction should carry out three-dimensional high-resolution thermo-mechanical simulation, considering the influence of crustal eclogitization(negative buoyancy) and mantle serpentinization(positive buoyancy) of oceanic lithosphere, in combination with geological and geophysical data.

关键词： Flat subduction Magmatism Intracontinental orogeny Formation mechanism Numerical modeling

An Adaptive 2D Planar Projection and Its Application in Geoscience Studies

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Journal of Earth Science 2015年第5期26卷 724-728页

作者： Yong Zheng Bikai Jin xiong xiong Sidao Ni State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and GeophysicsChinese Academy of Sciences

A linear projection approach is developed to present geoscience research result in planar coordinate system projected from spherical coordinate system. Here, the sphere is intersected by a plane and its surface is projected onto the plane. In order to keep the projected coordinate system orthogonal, and minimize the distortion, one axis of the planar coordinate system is chosen in our projection based on the shape of the region to be projected, and the other axes can be chosen arbitrarily or based on the constraint of the orthogonality. In the new method the projection is self-contained. The forward projection can be fully projected backward without loss of precision. The central area of the sphere will be projected to the planar system without distortion, and the latitudinal length in the rotated spherical system keeps constant during the projecting process. Only the longitudinal length in the rotated spherical system changes with the rotated latitude. The distortion of the projection therefore, overall, is small and suitable for geoscience studies.

关键词： adaptive 2D projection linear planar geoscience

Rupture process of the M_s 7.0 Lushan earthquake, 2013

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Science China Earth Sciences 2013年第7期56卷 1187-1192页

作者： LIU ChengLi ZHENG Yong GE Can xiong xiong HSU HouTze State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and GeophysicsChinese Academy of Sciences College of Earth Sciences University of Chinese Academy of Sciences

On April 20, 2013 at 8：02 am, a magnitude 7.0 earthquake occurred in Lushan County, Sichuan Province, China, which induces massive landslides, causes great losses to life and property. Based on the locations of aftershocks provided by the China Earthquake Network Center and the characteristic of Longmenshan active faults system, combined with the current preliminary focal mechanism solution, the fault rupture direction is determined. With the finite fault inversion method, we invert the rupture process of the Lusban Ms7.0 earthquake by teleseismic waveforms data. The inversion results indicate that the main shock is dominated by thrust fault component and the rupture initiated at depth of 15 km, and most of slip ruptured around the hypocenter with the peak slip of about 1.5 m. Most of rupture slips released at the first 20 s and the main rupture occurred at the first 10 s after the onsets of the mainshock. Most of seismic energy released near the hypocenter with a length of 28 km, especially on both sides of the hypocenter with the range of 20 km, and the seismic energy released relatively smaller in other areas. There is a large area with weak slip between the main rupture and another two asperities on both sides of the hypocenter; it may imply that the accumulated strain on the rupture fault has not been completely released. Therefore, there is a significant possibility of having strong aftershocks in the areas where energy is not fully released. This is also the main reason why there are a lot of moderate to strong aftershocks in the Lushan aftershock sequence. In addition, there is an earthquake vacant zone with a length of about 50 km between the Wenchuan Mw7.9 earthquake and this event, which is of high earthquake risk and is deserved to be paid close attention to.

关键词： Lushan earthquake finite fault model rupture process Longmenshan fault system

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基于能源生态架构的海绵城市电网建设

微型电脑应用 2024年第9期40卷 73-76页

作者：龚贤夫彭勃熊雄郑嘉鹏廖晖广东电网有限责任公司电网规划研究中心广东广州510080 电力规划设计总院北京100120 中国科学院广州能源研究所广东广州510651

在传统运行模式下,电网在安全性、经济性、消纳区外可再生能源等方面存在瓶颈。基于以电力为核心的能源生态架构,提出智能电网、泛在电力物联网和能源互联网建设背景下的城市海绵电网概念。分析城市海绵电网的建设意义、海绵电网的生态... 详细信息

在传统运行模式下,电网在安全性、经济性、消纳区外可再生能源等方面存在瓶颈。基于以电力为核心的能源生态架构,提出智能电网、泛在电力物联网和能源互联网建设背景下的城市海绵电网概念。分析城市海绵电网的建设意义、海绵电网的生态特征和海绵电网的组成,并给出海绵电网的评价体系,旨在为海绵城市电网的建设提出科学建议。

关键词：能源生态架构海绵电网泛在电力物联网能源互联网

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