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characterization of the flowability dynamics of granular material flowing down a narrow channel

Particuology 2020年第6期18卷 72-82页

作者： Ningsheng Wang Haifeng Lu Jianliang Xu Xiaolei Guo Haifeng Liu Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education East China University of Science and TechnologyP.O.Box 272Shanghai 200237China Shanghai Engineering Research Center of Coal Gasification East China University of Science and TechnologyP.O.Box 272Shanghai 200237China Ningbo Ruiling Institute for Energy and Environment Solutions Ningbo 315500China

The flowability of granular material is commonly determined from shear cell tests,but in the real world,the granular flow is quite different in many *** this paper,the flowabilities in a narrow channel of five different granular materials were *** flow parameters of the granular flows were determined to classify the flowabil让*** flow surface velocities and flow heights and thicknesses were measured,and it was found that the mean shear rates in the linear portions of the velocity profiles in crease with both flow rates and incli nation.A universal parameter,the ratio of the sine of the inclin ation to the shear rate in the linear part of the velocity profile,is proposed as a *** constant is independent of particle *** addition,a flowability parameter,the ratio of the mean shear rate to the cosine of the inclination,is proposed to characterize the friction between the particles in the flowing granular material.

关键词： dynamic characterization Granular flow Velocity profile Flowability Channel

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Vibrations induced by tunnel boring machine in urban areas: In situ measurements and methodology of analysis

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第1期15卷 130-145页

作者： Antoine Rallu Nicolas Berthoz Simon Charlemagne Denis Branque University of Lyon ENTPELTDS-UMR CNRS 5513CeLyAVaulx-en-VelinFrance French Centre for Tunnel Studies(CETU) BronFrance

Excavation with tunnel boring machine(TBM)can generate vibrations,causing damages to neighbouring buildings and disturbing the residents or the *** problem is particularly challenging in urban areas,where TBMs are increasingly large in diameter and shallow in *** response to this problem,four experimental campaigns were carried out in different geotechnical contexts in *** vibration measurements were acquired on the surface and inside the *** measurements are also complemented by few data in the *** original methodology of signal processing is pro-posed to characterize the amplitude of the particle velocities,as well as the frequency content of the signals to highlight the most energetic *** levels of vibrations are also compared with the thresholds existing in various European regulations concerning the impact on neighbouring structures and the disturbance to local residents.

关键词： Ground-borne vibrations Tunnel boring machine(TBM) In situ measurement dynamic characterization Vibration levels Site spectrum

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Precisely monitoring and tailoring the surface structures of nanomaterials by in-situ electron microscopy

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Science Foundation in China 2017年第4期25卷 48-63页

作者：徐涛王文尹奎波孙立涛 SEU-FEI Nano-Pico Center Collaborative Innovation Center for Micro/Nano FabricationDevice and SystemKey Lab of MEMS of Ministry of EducationSoutheast UniversityNanjing 210096China Center for Advanced Materials and Manufacture Joint Research Institute of Southeast University and Monash UniversitySuzhou 215123China Center for Advanced Carbon Materials Southeast University and Jiangnan Graphene Research InstituteChangzhou 213100China

The transmission electron microscope(TEM)is now one of the most powerful tools for structural characterization due to its high spatial resolution,especially with the advent of the spherical aberration *** interaction between electrons and specimens allows tailoring surface structures by electron ***,along with the development of special holders and specimen preparation techniques,the structural evolution of surfaces/interfaces can be dynamically monitored under external fields or reaction environments at the nanoscale,which promotes not only the establishment of the relationship between atomic structures and novel properties,but also potential applications in *** this report,we review some of our recent results obtained by TEM,including dynamical observation of surface-mediated novel phenomena,controllable fabrication of nanostructures,and some potential applications in nanodevices.

关键词： Surface structures dynamic characterization Transmission electron microscopy

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