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Mechanics Principle and Engineering Application of Split Layer and Bed Separation of Mining Overburden

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Mechanics Principle and Engineering Application of Split Lay...

Three-dimensional porous CoNiO_(2)@reduced graphene oxide nanosheet arrays/nickel foam as a highly efficient bifunctional electrocatalyst for overall water splitting

中国地质学会工程地质专业委员会、贵州省岩石力学与工程学会2005年学术年会暨“岩溶·工程·环境”学术论坛

作者： YU Guang-ming~1 zhanG Chur-hui~2 SU Zhong-jie~3 FAN Xue-li~3 pan yong-zhan~1 LIU Fu-shun~1 (1.Civil engineering institute,Qingdao Technological University,Qingdao,266033 2.Engineering college,Ocean University of China,Qingdao,266071 3.Liaoning Technical University,Fuxin,123000)

To control land surface subsidence caused the underground mineral exploitation and the catastrophic phenomena suchas serious damage of buildings,waterbodies,cultivated lands,railways,bridges caused by land subsidence,bed separationgrouting technology of overburden is put *** provide theoretical support for the technology,the characteristics and themechanics mechanism of mining overburden from layer-split to formation of bed separation are *** the basis of elasticsheet board theory,calculation formula of rock sheet deflection is presented,and the mechanics criteria of the separation forma-tion and the calculation formula of bed separation volume are set ***,the applications and technics of bed separationgrout technology of mining overburden to control land subsidence in china are introduced.

关键词： mining overburden layer splits bed separation grout control techniques of strata subsidence rock plate deflection

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Tungsten 2020年第4期2卷 390-402页

作者： Zhi‑Yi pan Zheng Tang yong‑Zhong zhan Dan Sun School of Materials Science and Engineering South China University of TechnologyGuangzhou 510641China Collaborative Innovation Center of Sustainable Energy Materials School of ResourcesEnvironment and MaterialsGuangxi Key Laboratory of Electrochemical Energy MaterialsGuangxi UniversityNanning 530004China College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

It is crucial to develop high-performance and cost-effective bifunctional electrocatalysts for both oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)toward overall water ***,a unique heterostructure of reduced graphene oxide(rGO)and CoNiO_(2) nanosheets directly grown on nickel foam(NF)were successfully fabricated and applied as a kind of highly efficient bifunctional *** optimum CoNiO_(2)@rGO/NF electrode exhibits excellent elec-trocatalytic OER performance with an overpotential of only 272 mV to drive a current density of 100 mA·cm^(−2),and HER performance with an overpotential of 126 mV to achieve a current density of 10 mA·cm^(−2).Meanwhile,the electrodes also display outstanding long-term stability for OER and HER with negligible activity and morphology degradation after at least 40 h ***,when employed as both cathode and anode for overall water splitting,CoNiO_(2)@rGO/NF elec-trode only requires 1.56 V at 10 mA·cm^(−2) and operates stably for over 40 h,which is among the best performing Co-based and Ni-based non-precious metal *** characterizations reveal that the extraordinary electrocatalytic performance should be attributed to the synergistic effect of the unique heterostructure of CoNiO_(2) nanosheets and rGO for increasing the electrode conductivity and integrity,ultrasmall primary particle size for providing larger electrode/electrolyte contact area and abundant active sites,and three-dimensional(3D)conductive networks for facilitating the electrochemical reaction.

关键词： CoNiO_(2)@reduced graphene oxide arrays Bifunctional electrocatalyst Oxygen evolution reaction Hydrogen evolution reaction Water splitting

A Time-Domain Numerical Simulation for Free Motion Responses of Two Ships Advancing in Head Waves

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China Ocean Engineering 2024年第3期38卷 519-530页

作者： pan Su-yong CHENG yong School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

The constant panel method within the framework of potential flow theory in the time domain is developed for solving the hydrodynamic interactions between two parallel ships with forward *** solving problems within a time domain framework,the free water surface needs to simultaneously satisfy both the kinematic and dynamic boundary conditions of the free water *** provides conditions for adding artificial damping *** the Runge−Kutta method to solve equations related to *** upwind differential scheme is used in the present method to deal with the convection terms on the free surface to prevent waves *** the comparison with the available experimental data and other numerical methods,the present method is proved to have good mesh convergence,and satisfactory results can be *** constant panel method is applied to calculate the hydrodynamic interaction responses of two parallel ships advancing in head *** simulations are conducted on the effects of forward speed,different longitudinal and lateral distances on the motion response of two modified Wigley ships in head *** further investigations are conducted on the effects of different ship types on the motion response.

关键词： ship motions time domain simulation forward speed different distances wave loads

Solar system interplanetary communication networks:architectures, technologies and developments

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Science China(Information Sciences) 2018年第4期61卷 19-44页

作者： Peng WAN Yafeng zhan Xiaohan pan Space Center Tsinghua University

With the development of deep space exploration technologies, main space agencies all over the world are working hard to develop the solar system interplanetary communication networks(SSICN). SSICN is a perspective communication networking system characterized by high data rate, high intelligent and perfect interconnection, which could provide the deep-space mission control and scientific application with the convenient, reliable and secure data transmission services. Following the introduction of future deep space exploration prospect, this paper analyzes the similarities and differences for three networks, terrestrial internet, near Earth space networks and SSICN, then discusses the key technologies and research trends of SSICN in details, and finally proposes the suggestions for the construction of future Chinese SSICN.

关键词： deep space exploration SSICN system architecture physical transmission network access up-layer application time synchronization

尾矿堆积坝分形结构及其对坝体力学性能的影响研究

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青岛理工大学学报 2011年第2期32卷 1-4,22页

作者：于广明潘永战宋传旺吴艳霞康寅青岛理工大学土木工程学院青岛266033

尾矿坝内部结构对其力学性质、变形特征和稳定性评价具有重要的影响.应用先进的分形几何学描述尾矿坝内部的结构特征,检验尾矿坝内部结构的分形性质,分析尾矿坝内部结构分形性质对尾矿坝力学性能的影响.研究表明,金矿尾矿坝坝体材料的... 详细信息

尾矿坝内部结构对其力学性质、变形特征和稳定性评价具有重要的影响.应用先进的分形几何学描述尾矿坝内部的结构特征,检验尾矿坝内部结构的分形性质,分析尾矿坝内部结构分形性质对尾矿坝力学性能的影响.研究表明,金矿尾矿坝坝体材料的粒径分布具有分形结构特征,粒径分布的分维值在一定程度上揭示了坝体材料在力学性能、渗透性能方面的性质.

关键词：尾矿坝分形结构力学性能变形特征

Networked TT&C for Mega Satellite Constellations:A Security Perspective

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China Communications 2022年第9期19卷 58-76页

作者： Yafeng zhan Guanming Zeng Xiaohan pan Beijing National Research Center for Information Science and Technology Beijing 100084China Department of Electronic Engineering Tsinghua UniversityBeijing 100084China

Satellite constellations are promising in enabling the global ***,the increasing constellation size also complicates tracking,telemetry and command(TT&C)*** groundbased and space-based approaches have encountered significant obstacles due to,e.g.,the limited satellite visible arc and long transmission *** the fast development of intersatellite communications,synergy among multiple connected satellites can be exploited to facilitate TT&C system *** leads to networked TT&C,which requires much less predeployed infrastructures and even performs better than traditional TT&C *** this paper,we elaborate system characteristics of networked TT&C compared with traditional ground-based and spacebased TT&C,and propose the unique security challenges and opportunities for networked TT&C,which includes secure routing and trust ***,since networked TT&C is a novel scenario with few relevant researches,we first investigate the current researches on secure routing and trust mechanisms for traditional terrestrial and satellite networks,and then accordingly deliver our security perspectives considering the system characteristics and security requirements of networked TT&C.

关键词： mega-constellation TT&C network security routing trust mechanisms

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与地面环境协调的地下工程开挖预警方法研究

青岛理工大学学报 2006年第4期27卷 1-5页

作者：于广明张春会潘永战刘福顺刘宁青岛理工大学土木工程学院青岛266033 中国海洋大学工程学院青岛266003 河南科技大学建筑工程学院洛阳471003

针对地下工程开挖引起地面沉降损害的严重性,提出了“开展与地面环境协调的地下工程开挖”的理念,研究了地下工程开挖建设、地下水开采、地下矿物开采引起地面沉降的预警方法,构建了与地面环境协调的地下工程开挖的GIS可视化决策和设计... 详细信息

针对地下工程开挖引起地面沉降损害的严重性,提出了“开展与地面环境协调的地下工程开挖”的理念,研究了地下工程开挖建设、地下水开采、地下矿物开采引起地面沉降的预警方法,构建了与地面环境协调的地下工程开挖的GIS可视化决策和设计系统,展望了今后进一步的研究方向,以指导地面沉降控制和损害防护工程的实施,达到地下工程开挖对岩土体、地表和地面建筑物、构筑物的损害最小,确保地下工程开挖与地面环境之间的协调关系达到最优化,从而实现地下工程开挖与地面环境的协调.

关键词：地下工程开挖地面环境协调地面沉降预警 GIS

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土结相互作用的地基沉降和结构内力计算方法

青岛理工大学学报 2005年第6期26卷 20-22,53页

作者：刘福顺于广明王卫英潘永战章伟青岛理工大学土木工程学院青岛266033

基础不均匀沉降将在上部结构内产生附加内力,而且地基变形也是随施工过程逐渐累积的过程.然而,常规计算方法既没有充分考虑上部结构、基础、地基之间的共同作用,也没有反映施工过程对结构内力的影响.针对上述问题,笔者推导了施工过程中... 详细信息

基础不均匀沉降将在上部结构内产生附加内力,而且地基变形也是随施工过程逐渐累积的过程.然而,常规计算方法既没有充分考虑上部结构、基础、地基之间的共同作用,也没有反映施工过程对结构内力的影响.针对上述问题,笔者推导了施工过程中地基变形和结构内力的计算公式,提出了考虑土结相互作用并模拟施工过程的实现方法.为研究地基变形和结构内力提供了手段,对采动区土地复垦及抗变形建筑物的设计、施工,防止或减轻地基变形对建筑物的损坏等具有重要现实意义.

关键词：土结相互作用施工过程地基沉降结构内力

Microstructure and creep properties of high Cr resisting weld metal alloyed with Co

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第10期11卷 756-760页

作者： Xue WANG Liang-fei zhan Qian-gang pan Zhi-jun LIU Hong LIU yong-shun TAO School of Power and Mechanical Engineering Wuhan University Wuhan 430072 China DongFang Boiler Group Co. Ltd. Zigong 643001 China

A 9% Cr ferritic steel weld metal containing 1% Co, partially substituted for nickel, was prepared by submerged arc welding (SAW) processing. The microstructure and creep properties of the weld metal were investigated. The microstructure exhibited a fully tempered martensitic structure free of δ-ferrite. The creep properties of the obtained weld metal were inferior to those of the P92 base metal at 600 and 650 °C. The values of A and n for weld metal in the Norton power law constitution at 650 °C are 1.1×10?21 and 8.1, respectively.

关键词： 9Cr steels Weld metal Microstructure Creep properties