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The Doppler effect induced by earthquakes:A case study of the Wenchuan MS8.0 earthquake

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Geodesy and Geodynamics 2022年第5期13卷 435-444页

作者： Qicheng Li jingwen sun Guimei Xi Jing Liu Mining College Liaoning Technical UniversityLiaoning 123000China Chaoyang Teachers College Liaoning 122000China Chaoyang Open University Liaoning 122000China

Seismologists have found that the first arrival frequencies of P waves at different seismic stations have different widths,that is,different periods or frequencies,and they think that this phenomenon can be used to identify whether a Doppler effect is induced by ***,the fault rupture process of a real earthquake is so complex that it is difficult to identify a frequency shift similar to the Doppler effect.A method to identify whether a Doppler effect is induced by an earthquake is proposed *** a seismic station is in the direction of fault rupture propagation,this station could observe a Doppler effect induced by the *** Doppler effect causes the frequency of the seismic wave to shift from low frequency to high frequency,and the high frequency amplitudes become mutually *** the combined influences of the absorption effect,geometric spreading effect and Doppler effect,the high frequency amplitude of the seismic wave will gradually become higher than the low frequency amplitude with increasing epicentral *** we find that the high frequency amplitude is higher than the low frequency amplitude with increasing epicentral distance in the direction of fault rupture propagation,then there is a Doppler *** fault that generated the Wenchuan earthquake is a reverse fault,and its horizontal rupture propagation velocity was *** link fault rupture propagation velocity with the Doppler effect and identify the Doppler effect more easily,we decompose three-component records into two directions:the direction of fault rupture propagation and the direction perpendicular to the fault rupture propagation along the fault *** initial components of the two directions are processed by wavelet *** seismic stations in the direction of fault rupture propagation of the Wenchuan earthquake were selected,and it was found that with increasing epicentral distance,the high frequency amplitudes of the wavelet spectra b

关键词： Doppler effect First arrival frequency of P wave Fault rupture propagation velocity Wavelet transform The wenchuan earthquake

Engineering of geometrical configurations in dual-atom catalysts for electrocatalytic applications

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Journal of Energy Chemistry 2024年第7期94卷 273-287页

作者： Tao Zhang Yifan Liu Liang Xue jingwen sun Pan Xiong Junwu Zhu Key Laboratory for Soft Chemistry and Functional Materials of Ministry Education School of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing210094JiangsuChina

Geometrical configurations play a crucial role in dual-atom catalysts(DACs)for electrocatalytic *** progress has been made to design DACs electrocatalysts with various geometri-cal configurations,but in-depth understanding the relationship between geometrical configurations and metal-metal interaction mechanisms for designing targeted DACs is still *** this review,the recent progress in engineering of geometrical configurations of DACs is systematically *** on the polarity of geometrical configuration,DACs can be classified into two different types that are homonuclear and heteronuclear ***,with regard to the geometrical configurations of the active sites,homonuclear DACs are identified into adjacent and bridged configurations,and heteronuclear DACs can be classified into adjacent,bridged,and separated ***,metal-metal interactions in DACs with different geometrical configurations are ***,the applications of DACs in different electrocatalytic reactions are discussed,including the oxygen reduction reaction(ORR),oxygen evolution reaction(OER),hydrogen evolution reaction(HER),and other ***,the future challenges and perspectives for advancements in DACs are *** review aims to provide inspiration for the design of highly effcient DACs towards energy relatedapplications.

关键词： Dual-atom catalysts Geometrical configurations Homonuclear Heteronuclear Electrocatalysis

NEW METHOD OF FORMATION DESIGN FOR BOTH GMTI AND INSAR USING DISTRIBUTED SATELLITES

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Journal of Electronics(China) 2007年第6期24卷 821-827页

作者： Yuan Hao Zhou Yinqing Li jingwen sun Muhan School of Electronics and Information Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

This letter proposes a method for designing a specific formation of satellites where the flying motion only exists in a circle orbit plane of the reference satellite, which means that the orbit eccentricity is zero. This method combines the Hill equation, the Kepler equation, and the geometrical inea^ing of orbit elements. It creates the redundancy condition to simplify the deducing process, utilizes multiple conditions to solve the orbit elements for the satellite formation, and obtains the analytical relationship of the orbit elements for the formation satellites with the formation parameters and the orbit elements of the reference satellite. Using these formulations, the orbit elements and formation parameters for the formation satellites can be solved for the given orbit elements of the reference satellite. The letter describes the proposed double-ellipse formation for both GMTI and InSAR, and the validity of the formation is demonstrated via simulation.

关键词： Synthetic Aperture Radar (SAR) Double-ellipse formation Dual-interferometry Orbit design

Band Engineering and Morphology Control of Oxygen‑Incorporated Graphitic Carbon Nitride Porous Nanosheets for Highly Efficient Photocatalytic Hydrogen Evolution

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Nano-Micro Letters 2021年第3期13卷 95-106页

作者： Yunyan Wu Pan Xiong Jianchun Wu Zengliang Huang jingwen sun Qinqin Liu Xiaonong Cheng Juan Yang Junwu Zhu Yazhou Zhou Key Laboratory for Soft Chemistry and Functional Materials Ministry of EducationNanjing University of Science and TechnologyNanjing 210094People’s Republic of China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013People’s Republic of China Institute of Nuclear Science and Technology Sichuan UniversityChengdu 610064People’s Republic of China

Graphitic carbon nitride(g-C3N4)-based photocatalysts have shown great potential in the splitting of ***,the intrinsic drawbacks of g-C3N4,such as low surface area,poor diffusion,and charge separation efficiency,remain as the bottleneck to achieve highly efficient hydrogen ***,a hollow oxygen-incorporated g-C3N4 nanosheet(OCN)with an improved surface area of 148.5 m2 g^−1 is fabricated by the multiple thermal treatments under the N2/O2 atmosphere,wherein the C–O bonds are formed through two ways of physical adsorption and *** physical characterization and theoretical calculation indicate that the O-adsorption can promote the generation of defects,leading to the formation of hollow morphology,while the O-doping results in reduced band gap of *** optimized OCN shows an excellent photocatalytic hydrogen evolution activity of 3519.6μmol g^−1 h^−1 for~20 h,which is over four times higher than that of g-C3N4(850.1μmol g^−1 h^−1)and outperforms most of the reported g-C3N4 catalysts.

关键词： Graphitic carbon nitride nanosheet Hollow morphology Oxygen incorporating Multiple thermal treatment Photocatalytic hydrogen evolution

Tortuosity regulation of two-dimensional nanofluidic films for water evaporation-induced electricity generation

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Nano Research 2024年第7期17卷 6192-6202页

作者： Zhihang Liu Chao Liu Anqi Ni Kunpeng Mao Long Chen Liang Xue jingwen sun Xin Wang Pan Xiong Junwu Zhu Key Laboratory for Soft Chemistry and Functional Materials of Ministry Education School of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing 210094China

Water evaporation-induced electricity generation is a promising technology for renewable energy ***,the output power of some reported two-dimensional(2D)nanofluidic films is still restricted by the relatively weak water–solid interactions within the tortuous *** further enhance the comprehension and utilization of water–solid interactions,it is of utmost importance to conduct an in-depth investigation and propose a regulatory concept encompassing ion ***,we propose tortuosity regulation of 2D nanofluidic titanium oxide(Ti_(0.87)O_(2))films to optimize the ion transport within the interlayer nanochannel for enhanced efficiency in water evaporation-induced electricity generation for the first *** significance of tortuosity in ion transport is elucidated by designing three 2D nanofluidic films with different *** analysis and in situ Raman measurement demonstrate that low tortuosity can facilitate the formation of efficient pathways for hydrated proton transport and promote water–solid ***,devices fabricated with the optimized 2D nanofluidic films exhibited a significantly enhanced output power density of approximately 204.01μW·cm^(−2),far exceeding those prepared by the high-tortuosity 2D nanofluidic *** work highlights the significance of the construction of low tortuosity channels for 2D nanofluidic films with excellent performance.

关键词： water evaporation-induced electricity generation tortuosity ion transport two-dimensional nanofluidic films

Metal-organic frameworks derived low-crystalline NiCo_(2)S_(4)/Co_(3)S_(4) nanocages with dual heterogeneous interfaces for high-performance supercapacitors

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Chinese Chemical Letters 2023年第1期34卷 152-158页

作者： Zixin Jia Youning Wang Jiaqi Chen Zhijie Cao Shugang Pan Yan Zhou jingwen sun Junwu Zhu Xin Wang Yongsheng Fu Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education Nanjing University of Science and TechnologyNanjing 210094China Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials Huaiyin Normal UniversityHuaiyin 223300China Ningxia University Yinchuan 750021China Changzhou Institute of Technology Changzhou 213032China

Nickel cobalt bimetallic heterogeneous sulfides are attractive battery-type materials for electrochemical energy ***,the precise synthesis of electrode materials that integrate highly efficient ions/electrons diffusion with abundant charge transfer channels has always been ***,an effective and concise controllable hydrothermal approach is reported for tuning the crystalline and integrated structures of MOF-derived bimetallic sulfides to accelerate the charge transfer kinetics,and thus enabling rich Faradaic redox *** as-obtained low-crystalline heterogeneous NiCo_(2)S_(4)/Co_(3)S_(4)nanocages exhibit a high specific capacity(1023 C/g at 1 A/g),remarkable rate performance(560 C/g at 10A/g),and outstanding cycling stability(89.6%retention after 5000 cycles).Furthermore,hybrid supercapacitors fabricated with NiCo_(2)S_(4)/Co_(3)S_(4)and nitrogen-doped reduced graphene oxide display an outstanding energy density of 40.8 Wh/kg at a power density of 806.3 W/kg,with an excellent capacity retention of 88.3%after 10000 charge-discharge cycles.

关键词： Metal-organic frameworks Nickel cobalt heterogeneous sulfides Low-crystalline nanostructure High-performance supercapacitors High energy density

Covalent Functionalization of Carbon Nitride Frameworks through Cross-Coupling Reaction

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Covalent Functionalization of Carbon Nitride Frameworks thro...

Multiscale confinement nitridation in molybdenum carbide for efficient hydrogen production

中国化学会第三届中国能源材料化学研讨会

作者： jingwen sun Key Laboratory of Soft Chemistry and Functional Materials Nanjing University of Science and Technology

Two-dimensional(2 D) carbon nitride(CN) based semiconductors possess a great promise in robust,low-cost alternative to metal-based materials such as photo,electro and heterogeneous ***,the properties of the final mate...

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Journal of Energy Chemistry 2024年第7期94卷 61-69页

作者： Liming Dai Chenchen Fang Xiaoyuan Zhang Xuefeng Xu Xuanxuan Chen Xinyue Zong Xueming Hu Wenyao Zhang Liang Xue Pan Xiong Yongsheng Fu jingwen sun Junwu Zhu Key Laboratory for Soft Chemistry and Functional Materials Ministry of EducationNanjing University of Science and TechnologyNanjing 210094JiangsuChina

The molybdenum carbide(Mo_(2)C)has been regarded as one of the most cost-efficient and stable electrocatalyst for the hydrogen evolution reaction(HER)by the virtue of its Pt-like electronic ***,the inherent limitation of high density of empty valence band significantly reduces its catalytic reactivity by reason of strong hydrogen desorption ***,we propose a multiscale confinement synthesis method to design the nitrogen-rich Mo_(2)C for modulating the band structure via decomposing the pre-coordination bonded polymer in a pressure-tight tube sealing ***-bonded c/N-Mo in the coordination precursor constructs a micro-confinement space,enabling the homogeneous nitrogenization in-situ happened during the formation of Mo_(2)***,the evolved gases from the precursor decomposition in tube sealing system establish a macro-confinement environment,preventing the lattice N escape and further endowing a continuous *** the multiscale confinement effects,the nitrogen-rich Mo2C displays as high as 25%N-Mo concentration in carbide lattice,leading to a satisfactory band ***,the constructed nitrogen-rich Mo_(2)C reveals an adorable catalytic activity for HER in both alkaline and acid *** is anticipated that the multiscale confinement synthesis strategy presents guideline for the rational design of electrocatalysts and beyond.

关键词： Molybdenum carbide Hydrogen evolution reaction Multiscale confinement synthesis Valence band modulation Nitrogen doping

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基于深度学习的水面清洁机器人的设计与实现

机械工程师 2025年第1期 15-19页

作者：韩诗禹马孟晨路志远刘伟祺孙静雯宁秋丽哈尔滨理工大学机械动力工程学院哈尔滨150080

针对现有的水面清洁装置大多无法实现全水面自主清洁的问题,设计了一种基于深度学习的水面清洁机器人。该机器人配合双螺旋桨电动机驱动、连杆聚拢垃圾结构、曲轴递推结构,能较好地完成水面自主清洁巡航。配合视觉系统,应用卷积神经网... 详细信息

针对现有的水面清洁装置大多无法实现全水面自主清洁的问题,设计了一种基于深度学习的水面清洁机器人。该机器人配合双螺旋桨电动机驱动、连杆聚拢垃圾结构、曲轴递推结构,能较好地完成水面自主清洁巡航。配合视觉系统,应用卷积神经网络进行训练,通过骨干网络、Ancher-Free检测头和损失函数等算法,使用YOLO PT模型,经过300次迭代,在自建数据集中,垃圾识别准确率达87%以上。该机器人同时提供方位数据,可实现无人自主系泊,为城市小型水面的治理提供了解决方案,并提高了垃圾回收利用率。

关键词：水面清洁机器人机器视觉垃圾检测 YOLO 自主系泊